What are the good methods for sheet metal cutting?

The cutting head of the fiber cutting machine moves from top to bottom, and the laser beam prints on the plastic plate, focusing on the small print diameter. Secondly, the more troublesome method of focusing the fiber laser cutting machine is the collimator method. Although it is troublesome, it is also a commonly used method, which is to add a collimator to the output end of the fiber laser cutting machine for beam expansion. After beam expansion, the beam diameter becomes larger and the divergence angle becomes smaller, so that within the cutting working range, the beam size before focusing at the proximal and distal ends is nearly the same. The cutting head adds an independent moving lens down axis. The fiber laser cutter and the Z axis that controls the distance between the nozzle and the material surface are two separate parts. When the machine table moves or the optical axis moves, the F-axis of the beam moves from the proximal end to the distal end at the same time, so that the spot diameter of the focused beam is consistent in the entire processing area.

Many electrical industries use laser cutting machining technology in the installation of exterior sheet metal parts and complete sets of electrical components, which improves product quality, reduces production costs, and achieves good production benefits.

In the electrical industry, CNC laser cutting machines are mainly used to cut sheet metal parts and complete sets of electrical components. Today, many electrical factories have improved product quality, reduced production costs, reduced labor intensity, improved traditional sheet metal processing technology, and received good production benefits after adopting this new technology.

Sheet metal cutting is a high-tech developed in recent decades. Compared with traditional cutting technology, it has the characteristics of high cutting precision, low roughness, high material utilization rate and production efficiency. Especially in the field of fine cutting, laser cutting has incomparable advantages over traditional cutting. Laser cutting for precision sheet metal processing is a non-contact, high-speed, high-precision cutting method that concentrates energy in tiny spaces and uses high-density energy.

Introduction to the manufacturing process and method of stamping sheet metal parts

Stamping processing technology is a relatively advanced processing technology, and everyone may not know much about stamping processing. Then the editor of Zhejiang Baifudu Electromechanical will introduce it to you.

Stamping refers to a production technology that uses a mold to apply an external force to the plate in the mold on the press, thereby deforming the plate and obtaining the required shape and size. The method of stamping is generally cold stamping, so stamping parts are generally carried out at room temperature when they are manufactured, but they are called cold stamping.

Cold stamping is a processing method often used by stamping manufacturers. Stamping parts can be processed at room temperature, and cold stamping can be used to obtain products, which are basically no different from molds, and can even be described as exactly the same. , to better ensure the accuracy, size, size and appearance of the product. And the operation is relatively simple, the production efficiency is relatively high, the labor amount is small, and the cost is relatively low. Therefore, stamping manufacturers generally use this method to process stamping parts. This stamping process is very suitable for mass production of products.

In fact, the processed products have many uses. In daily life, these produced stamping parts can be seen everywhere, and there are many stamping parts in many instruments, bicycles, and household appliances. In the automotive industry, metal stampings account for nearly half of the total parts; in agricultural products, tractors of all sizes have stampings. Even in aerospace, there are stamped parts.

As can be seen from the above, stamping parts manufacturing is indeed a very advanced, fast and convenient production technology. It is hoped that this kind of good stamping processing technology can appear in more fields in the future.

What are the applications of laser in sheet metal?

The processing steps of sheet metal processing parts are: product preliminary experiment, product processing trial production and product batch production. In the process of product processing and trial production, customers should communicate with customers in a timely manner, and after obtaining corresponding processing evaluations, mass production of products should be carried out.

Laser drilling technology is a relatively early practical laser technology in laser material processing technology.

Laser drilling in sheet metal workshops generally uses pulsed lasers with high energy density and relatively short time. It can process small holes of 1 μm, especially suitable for processing small holes with a certain angle and thinner materials, as well as deep holes and tiny holes on parts of high strength, high hardness or brittle soft materials.

The burner parts of the gas turbine can be drilled with lasers, and the drilling effect can achieve three-dimensional orientation, and the number can reach thousands. Perforable materials include stainless steel, Inconel and HASTELLOY based alloys. Laser drilling technology is not affected by the mechanical properties of materials, and it is easier to automate.

With the development of laser drilling technology, the current laser drilling machine has realized automatic operation. Its application in the sheet metal industry has changed the processing method of traditional sheet metal technology, realized unmanned operation, and provided a lot of production efficiency , realizes fully automatic operation, promotes the development of sheet metal economy, the punching effect is improved by a grade, and the processing effect is also more obvious.

Briefly describe the processing steps of sheet metal stamping parts

For any sheet metal part, there is a certain processing of sheet metal stamping parts, which is the so-called technological process. Depending on the sheet metal structure, the process flow may vary, but generally no more than the following:

1. Design and draw the part diagram of its sheet metal parts, also called three views. Its function is to express the structure of sheet metal parts by drawing.

2. Draw an expansion diagram. That is, the parts with complex structure are unfolded into a flat part.

3. Blanking. There are many blanking methods, including the following:

(1) Shearing machine blanking: It is to use a shearing machine to cut out the shape, length and width of the unfolded drawing. If there are punching and chamfering, then resort to punching and punching die for punching and chamfering.

(2) Punching and blanking: After the parts are unfolded and formed, the punch is used to punch the flat structure in one or more steps. Its advantages are short labor time, high efficiency, which can reduce processing costs, and is often used in mass production.
(3), NC numerical control blanking. When NC blanking, the first step is to write the CNC machining program, that is, use the programming software to write the unfolded drawing into a program that the CNC machining machine can recognize. Let it follow these procedures step by step on the iron plate, punching out the structure and shape of its plate.

(4), laser cutting. The laser cutting method is used to cut the structural shape of the flat plate on the iron plate.

4. Flanging and tapping. Flanging, also called drawing hole, is drawn from a smaller base hole into a slightly larger hole, and then tapped on the drawing hole, which can increase its strength and avoid slippage. Generally used for sheet metal processing. When the thickness of the plate is large, such as 2.0, 2.5, etc., we can tap directly without flanging.

5. Punch. Generally, processing methods such as punching and cutting corners, punching and blanking, punching convex hulls, punching and tearing, and punching holes are used to achieve the processing purpose. Processing requires corresponding molds to complete the operation, such as punching convex hulls with convex hull molds, and tearing forming molds for punching and tearing.

6, pressure riveting. Pressure riveting as far as our factory is concerned, riveting studs, riveting nuts, riveting screws, etc. is often used. The riveting method is generally completed by a punch or hydraulic riveting machine, and riveted to the sheet metal parts.

7. Bending. Bending is the folding of a 2D flat part into a 3D part. Its processing requires a bending machine and a corresponding bending die to complete the operation, and there is also a certain bending sequence. Its principle is that the first fold does not interfere with the first fold, and the back fold will produce interference.  

8. Welding. Welding is to weld multiple parts together to achieve the purpose of processing or to weld the side seam of a single part to increase its strength. The processing methods generally include the following: CO2 gas shielded welding, argon arc welding, spot welding, robot welding, etc.

9. Surface treatment. Surface treatment generally includes phosphating film, electroplating colorful zinc, chromate, baking paint, oxidation, etc. Phosphating film is generally used for cold-rolled sheets and electrolytic sheets, and its function is mainly to coat a layer of protective film on the surface of the material. , to prevent oxidation; the second is to enhance the adhesion of its paint.

What are the fastening methods of mold parts?

3. Riveting method: open a groove on the punch along the outer contour, determine the groove depth according to the working conditions of the die, then put the die into the fixing plate, and finally squeeze the punch around the punch with the fixing plate material.

4. Heat sleeve method: The cooperation between the mold sleeve and the concave mold adopts a large amount of interference. When the connection of the interference fit only plays a fixed role, the amount of interference should be less, and when the connection increases the prestress, the amount of interference should be large.

5. Welding method: It is mainly used for the equipment of cemented carbide convex and concave mold. The solder is brass, and it is cooled slowly after welding.

6. Low melting point alloy method: Low melting point alloy refers to the volume expansion during condensation, and uses this characteristic to fix parts.

7. Epoxy resin bonding method: After hardening, it has strong adhesion to metals and non-metals, high connection strength, good chemical stability, small shrinkage, and simple bonding method. However, the hardness is low, and it is not resistant to high temperature, generally lower than 100 degrees.

8. Inorganic bonding method: copper oxide powder is quantitatively mixed with aluminum hydroxide phosphoric acid solution, which has high bonding strength and good wear resistance, but has poor impact ability and is not resistant to acid and alkali.

How do automobile stamping parts processing manufacturers check stamping parts?

1. Touch check: Wipe the outer surface of the cover with a clean gauze. Inspectors need to wear touch gloves and touch the surface of the metal stamping in the longitudinal direction. This inspection method depends on the inspector’s experience.

2. Oil inspection: A clean brush applies oil evenly to the entire outer surface of the metal stamping. Check oiled stampings under bright light. This way, small dimples, depressions and ripples on the stamped part can be easily found.

3. Flexible gauze polishing of metal stamping parts: Use flexible gauze to approach the outer surface of metal stamping parts in the longitudinal direction, and polish the entire surface, and it is easy to find any pitting and indentation.

4. Polishing with oil stone: first wipe the outer cover with a clean gauze, then polish with oil stone, and use a relatively small oil stone for arc areas and hard-to-reach areas. Special local areas can also be supplemented with lateral grinding.

5. Appearance inspection: It is mainly used to find abnormal appearance and macroscopic defects of stamping parts.

Today, the market competition of automotive metal stamping parts has entered a peak period. In order to win customers, many manufacturers put their energy into the price war, and even spare no effort to reduce the production cost without bottom line in order to win the price war. This marketing method will definitely be eliminated by the society. Even temporary volunteering will still not go far, and it will even bring unnecessary economic and reputation losses to future cooperation. Good quality control is the basis for the rapid development of stamping parts processing plants.

What are the key conditions in the forming process of stamping parts?

In fact, the so-called performance is mainly worth the forming limit, moldability and shape freezing of stamping parts. Among them, the forming limit mainly refers to the maximum deformation degree of the raw material of the stamping part during the forming process, and on the premise of ensuring no cracking. In many cases, we consider the forming limit to be the fracture resistance of the material, that is, the better the fracture resistance of the stamped material, the higher the forming limit.

And mold fit and shape freezing refers to the ability of the material to obtain the shape of the mold during the stamping process and to obtain the shape in the mold. There are many influencing factors. Pay attention to all aspects and try to avoid the influence of the material properties by the impression concept stock, so that the shape error of the stamping parts is large.

The above is the key point in the forming process of stamping parts introduced by Zhejiang Baifudu Electromechanical Editor and everyone. Do you have more understanding of stamping parts after reading it? I hope that my friends can help you after reading the above content.

How to choose high-quality stamping parts correctly?

All kinds of stamping parts can be seen everywhere in our daily life. Many domestic manufacturers have clearly seen the huge potential of the stamping market, and continue to increase their investment in the stamping market, which has effectively improved the quality of my country’s stamping products, so that they can meet the needs of the market. In the face of products produced by many manufacturers, how to choose is a headache for consumers, and which is better for high-quality stamping parts processing is a topic of concern.

When evaluating which manufacturer of metal stamping parts has better quality, the first thing to look at is the quality of the manufacturer’s products. Whether the manufacturer can produce in accordance with the relevant regulations in the production process, whether the product quality meets the relevant regulations and other related issues are all important evidences for measuring a manufacturer. When selecting, professional manufacturers let us consider the first time.

All kinds of stamping parts can be seen everywhere in our daily life. Many domestic manufacturers have clearly seen the huge potential of the stamping market, and continue to increase their investment in the stamping market, which has effectively improved the quality of my country’s stamping products, so that they can meet the needs of the market. In the face of products produced by many manufacturers, how to choose is a headache for consumers, and which is better for high-quality stamping parts processing is a topic of concern.

When evaluating which manufacturer of metal stamping parts has better quality, the first thing to look at is the quality of the manufacturer’s products. Whether the manufacturer can produce in accordance with the relevant regulations in the production process, whether the product quality meets the relevant regulations and other related issues are all important evidences for measuring a manufacturer. When selecting, professional manufacturers let us consider the first time.

Talking about the Analysis of Precision Machining Control of Mould Parts

For parts made of Cr12MoV, quenching is performed after rough machining. After quenching, the workpiece has a large residual stress, which is easy to cause cracking during finishing or work. After quenching, the parts should be tempered while hot to eliminate quenching stress. The quenching temperature is controlled at 900-1020°C, then cooled to 200-220°C, air-cooled, and then quickly returned to the furnace for tempering at 220°C. This method is called hardening process, which can obtain higher strength and wear resistance. The die in the form of failure has a better effect. Tempering is not enough to eliminate quenching stress, and workpieces with complex shapes are not enough to eliminate quenching stress. Before finishing, stress annealing or multiple timely treatments should be performed to fully relieve stress.

For powder alloy steel parts such as V10 and APS23, since they can withstand high temperature tempering, a secondary hardening process can be used during quenching, quenching at 1050-1080 °C, and then tempering at 490-520 °C for several times to obtain higher impact toughness and stability, it is very suitable for molds with chipping as the main failure mode. Powder alloy steel has high cost, but good performance, and is forming a wide range of application trends.

3. Grinding of parts

There are three main types of grinding: surface grinders, internal and external cylindrical grinders and tool grinders. In the process of finishing grinding, the generation of grinding deformation and grinding cracks should be strictly controlled, and even very small cracks will be revealed in subsequent processing and use. Therefore, the fine grinding knife should be small, not large, the coolant should be sufficient, and the dimensional tolerance should be within 0.01mm to grind the internal parts at a constant temperature. For a 300mm long steel piece, when the temperature difference is 3°C, the material changes by about 10.8μm, 10.8=1.2×3×3 (deformation per 100mm is 1.2μm/°C). The influence of this factor should be fully considered for each finishing process.

It is very important to choose the right grinding wheel when fine grinding. According to the high vanadium and molybdenum conditions of die steel, it is more suitable to choose GD single crystal corundum grinding wheel. When processing hard alloy and high quenching hardness materials, organic binder diamond grinding wheel is preferred. The organic binder grinding wheel has good self-grinding ability. The roughness of the grinding workpiece is Ra=0.2μm. In recent years, with the application of new materials, the CBN grinding wheel, that is, the cubic boron nitride grinding wheel, has a better finishing effect than other types of grinding wheels in CNC forming grinding, coordinate grinding machines, and CNC internal and external cylindrical grinding machines. During the grinding process, attention should be paid to repair the grinding wheel in time to keep the grinding wheel sharp. When the grinding wheel is passivated, it will slide and squeeze on the surface of the workpiece, causing burns on the surface of the workpiece and reducing the strength.

The processing of plate parts is mostly processed by a surface grinder. In the process of processing, long and thin plate parts are often encountered, which are difficult to process. Because in the process of processing, under the action of magnetic adsorption, the workpiece is deformed and close to the surface of the worktable. When the workpiece is removed, the workpiece will be deformed back, and the thickness measurement is consistent, but the parallelism cannot meet the requirements. The solution can be magnetic grinding. Method, the grinding block is placed under the workpiece, and the four-sided block is dead. When processing small knives and multi-blade knives, the processing does not require the block and other blocks. Direct adsorption processing can improve the grinding effect and meet the parallel requirements.

The shaft parts have rotary surfaces, which are widely used in internal and external cylindrical grinders and tool grinders. In the process of processing, the headstock and the top are equivalent to the busbar. If there is a runout problem, the machining workpiece will also have this problem, affecting the quality of the part. Therefore, the inspection of the headstock and the top should be done before processing. When grinding the inner hole, the coolant should be fully poured to the grinding contact position so that the grinding can be discharged smoothly. It is best to use a clamping process table for the processing of thin-walled shaft parts, and the clamping force should not be too large, otherwise the inner triangle deformation will easily occur around the workpiece.

What three aspects are included in the machining accuracy of parts?

The machining center is a CNC mechanical equipment integrating milling, boring, drilling, tapping and thread cutting, etc., and its external shape is relatively complex. The types of workpieces produced by the machining center are divided into the processing of products and molds. In the process of product parts processing, high precision and high speed are required. The neck includes the following three aspects in the processing of parts.

Machining accuracy refers to the degree of conformity between the actual size, shape and position of the surface of the machined part and the ideal geometric parameters required by the drawing.

1. Dimensional accuracy

Refers to the consistency between the actual size of the processed part and the center of the part’s dimensional tolerance zone.

2. Shape accuracy

It refers to the degree of conformity between the actual geometry of the surface of the part being machined and the ideal geometry.

3. Position accuracy

Refers to the actual positional accuracy difference between the relevant surfaces of the machined part.

The actual parameters obtained by the workpiece produced by the machining center will not be absolutely accurate. From the function of the part, as long as the machining error is within the tolerance range required by the part drawing, it is considered that the machining accuracy is guaranteed. In this process, the quality of the machine tool depends on the machining quality of the parts and the assembly quality of the machine. The machining quality of the parts includes the machining accuracy of the parts and the surface quality.

Machining accuracy refers to the degree to which the actual geometric parameters (size, shape and position) of the part after machining are consistent with the ideal geometric parameters. The difference between them is called machining error.

What is the reason for the cracking of stamping parts?

1. Reasons for bending and cracking of stamping parts

1. The steel used has poor plasticity, including the low elongation of the steel, the uneven grain size, the continuous occurrence of harmful Widmanstler structures, the cold bending performance that does not meet the technical standards, and the poor surface quality of various kinds, etc. Problems may cause a drop in plasticity, resulting in the consequences of bending cracking.

2. When the angle between the bending line and the direction of the embossing of the sheet does not meet the layout regulations, the angle between the direction of the embossing of the bent sheet does not meet the process regulations.

3. The bending radius is too small, and the deformation degree of the outer metal during the bending process exceeds the deformation limit.

4. The quality of blank shearing and punching sections is poor, such as large burrs or cracks in the sheet at the bend.

5. The thickness of the material is seriously out of tolerance, which will cause difficulty in feeding and cracking.

6. Factors such as the wear of the mold fillet radius or the too small gap, the rough surface of the die or the improper design structure cause the feeding resistance to be large, and the stamping parts are easy to crack.

7. The quality of pickling is poor, and the pickling process of steel is carried out carelessly, resulting in over-pickling or hydrogen embrittlement, resulting in reduced plasticity and cracking.

8. Insufficient lubrication, high friction, easy to cause cracks.

Second, the solution to the bending and cracking of stamping parts

1. Improve the condition of the steel plate, mainly including the selection of steel with good plasticity (such as good cold bending performance), local annealing in the parts with large deformation, and improving the quality of the sheared blank section.

2. Improve the technical state of the working part of the mold, reduce the roughness of the working surface of the convex and concave mold, and adjust the reasonable gap.

3. Formulate the correct process plan, select the appropriate process plan, so that the flow resistance of the steel during the bending process is small and the deformation is easy.

4. Improve the manufacturability of the product structure, select a reasonable fillet radius, and increase the process incision at the local bending part to avoid root fracture.

5. Improve lubricating conditions, lubricate rationally, and use lubricating oil with good lubricating performance to reduce the resistance of steel flowing during the bending process.

How to cut sheet metal parts?

The cutting process in sheet metal parts processing can not only change the style, but also deal with aspects such as thickness, so the effect of using it in different environments is also different. Therefore, cutting is the function of sheet metal parts changing their essence during processing, and we must know quite a few cutting methods.

Electric welding, plasma cutting, laser cutting and other methods are more common, and laser cutting is used in the sheet metal processing process. This is because the hardness of sheet metal is relatively hard, so choosing laser cutting is also a better choice when processing.

When using laser cutting, the section is relatively neat and clean. It will be simpler to dispose of in the later stage, and it will be more suitable when used. When using it, there will be no inconsistency in the environment, and the effect that can be exerted is quite large. Be very careful when cutting to avoid confusion on the cut side.

Common problems and solutions in the production of metal stamping and drawing parts

Metal stamping parts and deep drawing parts can be seen everywhere in our daily life. During the mass production of metal stamped and deep drawn parts, various problems arise for various reasons. In this article, the editor of Zhejiang Baifudu Electromechanical shares the common problems and solutions in the production process of metal stamping and drawing parts.

1. The shape and size of metal stamping and drawing parts do not match

The main reason for the inconsistent shape and size of metal stamping and drawing parts is springback and inaccurate positioning. In addition to taking measures to reduce springback, the reliability of blank positioning should also be improved.

2. Surface strain of metal stamping and drawing parts

The surface strain of metal stamping and deep drawing parts is caused by improper material selection, low heat treatment hardness, poor finish, concave die fillet wear, poor surface quality of curved blanks, excessive material thickness, unreasonable process plan selection, and insufficient lubrication. of.

3. Bending cracks in metal stamping tensile parts

(1) When the angle between the bending line and the direction of the embossing of the sheet does not conform to the specified layout, when bending in a one-way V shape, the bending line should be perpendicular to the direction of the embossing; when bending in two directions, the bending The direction of bending and embossing is preferably 45 degrees.

(2) The plasticity of the tensile material is poor.

(3) The bending radius is too small and the pickling quality is poor.

(4) Insufficient lubrication – larger friction.

(5) The radius of the convex and concave die is worn or the gap is too small – the feeding resistance increases.

(6) The quality of the shearing and punching sections of the stretched blank is poor – burrs, cracks.

(7) The material thickness is seriously out of tolerance – feeding is difficult

solution:

1. The shape of metal stamping and drawing should be as simple and symmetrical as possible, and one deep drawing should be done as much as possible.

2. For parts that need to be stretched multiple times, under the premise of ensuring the necessary surface quality, the inner and outer surfaces should have traces that may appear during the stretching process.

3. Under the premise of ensuring the installation requirements, the side walls of the deep-drawn parts should have a certain slope.

4. The distance from the edge of the hole at the bottom of the drawing piece or the flange to the side wall should be appropriate.

5. The corner radius of the bottom and the wall, the flange and the wall, and the four corners of the rectangular piece should be appropriate.

6. The scale marking of metal stamping and drawing parts cannot mark the internal and external dimensions.

What are the factors that affect the galvanizing of metal stampings?

1. The surface of metal stamping parts is not thoroughly cleaned, and a curing film is formed on the surface of stamping parts, which affects the normal deposition of electro-galvanizing.

2. Stamping parts have high carbon content. High carbon steel and cast iron will reduce the hydrogen evolution potential, accelerate the hydrogen evolution on the surface of the workpiece, and reduce the electroplating efficiency.

3. The stamping parts are bundled too tightly, and part of the surface is not plated in place during the galvanizing process.

4. The content of additives in the galvanizing bath is low. Low additive content will affect the dispersibility of zinc, and the coating will appear too thin in some parts.

5. Surface corrosion will also reduce the hydrogen evolution potential, accelerate the surface hydrogen evolution of stamping parts, reduce the current efficiency, and affect the deposition rate of zinc.

6. Low sodium hydroxide content. Low sodium hydroxide content reduces current density and anode passivation.

7. Anode passivation will reduce the effective area, thereby affecting the normal distribution of current.

Well, the above is the relevant content about “What are the factors that affect the galvanizing of metal stamping parts?” I hope the above content can help you.

How to check hardware precision shrapnel?

Hardware precision shrapnel is everywhere in life. It is a mechanical part that uses elasticity to work. Usually made of metal shrapnel steel. Hardware precision shrapnel is used to control the movement of machine parts, severe shock or vibration, store energy, measure force, etc. Hardware precision shrapnel is widely used in machine and appearance. There are many kinds of hardware precision shrapnel. Divided by shape, there are mainly spiral metal shrapnel, reel metal shrapnel, flat metal shrapnel, etc.

First, the method of checking the hardware shrapnel

Touch Check: Wipe the surface of the cover with a clean gauze. Inspectors should wear touch gloves and touch the surface of stamping parts longitudinally. This inspection method depends on the inspector’s experience. If necessary, you can sand the suspicious area with a whetstone and verify it, but this method is an effective and quick way to check.

Polishing with elastic gauze: Wipe the surface of the cover with a clean gauze. The flexible sand screen is used to stick to the surface of the stamping part, and it is polished to the entire surface in the longitudinal direction, and any pitting and indentation can be easily found.

Oiling check: Wipe the surface of the cover with a clean gauze. Then use a clean brush to evenly coat the entire surface of the metal stamping in the same direction. Check oiled stampings under bright light. It is recommended to erect the stampings in the direction of the body. With this method, it is easy to spot small pits, dimples and ripples on the stamped part.

Whetstone grinding: first clean the surface of the outer cover with a clean gauze, then use a whetstone (20201000mm or larger) to polish, and use a relatively small whetstone (such as a 8100mm semi-circular whetstone) to polish it into a curved shape, which is not easy to touch. The particle size of the oil depends on the surface conditions (such as roughness, electroplating, etc.). Fine-grained petroleum is recommended. The grinding direction of the oil is basically vertical, matching the surface of the stamped part, and more parts can compensate for the lateral grinding.