Stamping dies, protective measures for stamping operations

The main reason for the formation of the mold is: the mold is misguided and skewed. Otherwise, it will cause mold damage and mold deformation, such as mold base, template hardness, template thickness planning is too small, easy to be affected by external force collision deformation; mold orientation is not correct, the upper and lower mold positioning error is out of tolerance. At this time, the strength of the punch should be increased to strengthen the guidance of the stripper. It may also be that the precision of the die is too low, resulting in a dryness of the die that is not proportional to the strength of the die. The orientation of the mold is too close, causing the lateral force of the mold to be unbalanced. When stamping, once the mold is insensitive or even stuck, stop production immediately, find out the cause of the stuck mold, and eliminate the problem.

The cost of mold production is high, and the cost of ordinary molds accounts for 1/4-1/5 of the cost of stamping molds. The cost of a trim is more than 70% of the original cost of the mold, and the life of the mold may be approaching. If the mold repair process is too complicated, the mold repair cost is too high, the difficulty is too high, and the maintenance cycle is too long, it will seriously affect the normal production of stamping parts.

Under normal circumstances, after the mold is damaged, there will be a multiple-choice question to repair and invalidate it. However, in this way, the mold can be repaired in time, effectively avoiding damage to the mold, and can greatly reduce the cost of the mold for stamping production. After the die sleeve is seriously damaged, sometimes the punch and the die are damaged together. The reason is that, in addition to the difficulty of mold manufacturing, the cost is too high. Unnatural wear of the blanking die fails, if not for damage to the connecting parts.

Under normal circumstances, the main failure mode of the die is excessive wear, which requires the manufacture and use of the die again. Therefore, timely repair and prevention of molds can greatly reduce the cost of molds for stamping parts.

In addition, some protective technical measures should be adopted during the stamping process:

1. The protection of the stamping work area of ​​the stamping parts processing factory.

1. Install protective devices around the die.

2. The die is properly designed, and the die reduces the danger range.

3. Automatic or mechanical feeding design.

Second, stamping parts processing factory anti-punch protection measures.

1. Pushing hand: a protective device that is connected to the slider of the punch press and uses the swing of the baffle to push the worker’s hand out of the die mouth.

2. Swing rod protection device: a device that uses the lever principle to pull the hand.

3. Handle protection device: It is a device that uses pulleys, levers and ropes to make the hands of the staff and the slider move in conjunction.

The above is the related content of stamping die problems and protective measures. The role of die in stamping process cannot be ignored. Only by doing a good job in relevant protection work and solving problems in time can we reduce costs and improve efficiency. Hope the above will be helpful to readers.

Know some types of temperature sensors

If the voltage difference is amplified, the device produces an analog signal that is proportional to the temperature.

Temperature sensor type:

Thermocouple Sensor

Thermistor Sensor

Resistance temperature detector

thermometer

Infrared temperature sensor

Semiconductor-Based Sensors

Thermocouple Sensors –

A thermocouple sensor is a temperature measurement tool located on two different conductors that touch each other at one or more points. It produces a voltage when the temperature of one of the points is different from the reference temperature of one of the points and the reference temperature of the rest of the circuit.

Thermistor Sensor –

This type of sensor is widely used in body thermometers. If the temperature changes, so does the current or resistance.

Thermistors are instruments made of semiconductor materials whose resistivity is particularly sensitive to temperature.

The resistance of the thermistor decreases as the temperature increases, so when the temperature changes, the change in resistance can be monitored.

Resistance temperature detectors –

They are temperature sensors. Temperature sensors with resistors accumulate temperature changes that change the resistance value.

Resistance temperature detectors are used in the temperature range of -500c to 5000c for thin films and +2000c to 8500c for wirewound varieties. Thin-film (resistance temperature detector) elements have a thin layer of platinum on the underlying material. A new type of model was created, providing the circuit, and providing the specific resistance.

thermometer –

It is a device for measuring the temperature of any kind of solid or liquid, this alcohol is used in tubes that change volume by changing the temperature.

Its volume is proportional to temperature.

Infrared temperature sensor –

This is an electronic non-contact sensor that can be used to emit infrared radiation. IR temperature sensors on the market are I through the surface temperature that emits radiation. Its cost depends on its operation. Its accuracy level depends on its cost. In other words, low cost – low accuracy level and high cost – high accuracy level.

Semiconductor based sensors –

It operates under reverse bias with small capacitance and low leakage current. They are formed on thin silicon wafers. They are compact and produce linear output with a small temperature range. They also feature low cost and accurate tracking calibration.

          Semiconductor-based sensor types –

Voltage output

Current output

digital output

Resistive output

simple diode

Application of temperature sensor:

These are used in electric motors to measure motor winding temperature, bearing temperature, brush temperature.

These are cables used to measure the temperature inside the bench.

Used in mechanical engines to measure engine oil temperature and engine bearing temperature.

In the rubber, plastic, biomedical industries.

What are the differences in the manufacture of stamping dies?

First, the manufacturing difference of stamping dies

1. Different smelting process

The smelting process of Dachang material is electric furnace smelting, out-of-furnace refining, and vacuum degassing. The chemical composition of the steel in this process is accurately controlled, the gas content in the steel is low, and the steel purity is high. The materials of small factories are generally mixed scrap and furnace materials in the intermediate frequency furnace, and the flat steel ingots are directly poured. The chemical composition deviation of this process is large, the impurities in the steel are large, and the gas content is high, resulting in more shrinkage cavities and internal cracks in the finished product, which seriously affects the processing performance of the steel.

2. The rolling process is different

Dachang’s steel ingots are forged into billets and then rolled into products. During the rolling process, multiple rolling mills and multiple deformations are used for continuous rolling. Small mills are steel ingots that are directly rolled back and forth by a single rolling mill. The ingot deformation is small, the rolling ratio is small, the internal microstructure is uneven, and the non-metallic inclusion particles are large. It is directly manifested as the local “saw and drill” of the material.

3. Different appearance quality

Since the material of the big factory is continuously rolled, and the number of deformations is large, the precision of its appearance and size is high, and the two sides are approximately right angles. Because the production process of the small factory material is all controlled manually, its appearance size deviation is large, the thickness and width tolerance is large, the flat steel fillet is large, and the cross-section deviates from the rectangle.

4. Different heat treatment methods for finished products

After the material of the big factory is finished, the global annealing process is adopted to ensure that the carbide grade in the steel is not greater than grade 4, and the uniformity of hardness is ensured. Small factory materials adopt general softening annealing process, even natural cooling, which cannot guarantee the uniformity of carbide grade and hardness in steel.

5. The effect is different

Due to the different production processes, it directly affects the use effect of materials. First of all, the material size deviation of the small factory is large, and the straightness is relatively poor, resulting in a large enough machining allowance during processing, otherwise it cannot be processed. Secondly, due to the uneven hardness of materials in small factories, it is difficult to process and punch holes, and the processing efficiency is low. After processing, the workpiece is easily deformed, and even the mold is scrapped.

How to adjust the production of precision metal stamping parts?

1. The adjustment method is: first turn the material thickness adjustment disk clockwise, and pull the material belt with one hand. If the material tape can be pulled out, it needs to be slowly turned counterclockwise until the material cannot be pulled out, then turn the two small grids counterclockwise, and then tighten the screw. If the material cannot be pulled, but the clockwise or counterclockwise rotation of the material thickness adjustment dial is relatively loose, use your fingers to slowly and gently turn clockwise, but do not use force. Turn the two small grids counterclockwise until they can’t turn, and then tighten the screws. The same goes for the adjustment of the retaining clips.
2. After adjusting the material thickness of the moving splint, the flywheel of the punch press needs to be rotated 90 degrees clockwise. During this period, it is necessary to check whether the moving splint is in a clamped state. Adjust the material thickness of the retaining clip by 90 degrees. First turn on the main switch for clamping and loosening the feeding clip, place 1.5T material at the material thickness adjustment plate of the moving clip, hold up the moving clip material block without clamping the material, then pass the material through the fixed clip, and then clamp the feeding clip Tighten the main switch and turn it off, and then adjust the thickness of the fixed clip material according to the method of adjusting the thickness of the moving clip material.

3. After the distance is adjusted, turn on the main switch for clamping and releasing the feeding clip, remove the material placed on the material thickness adjustment plate of the moving clip, and move the flywheel of the punch press away from the upper mold stripping plate to guide the needle into the lower mold to float. When the pin hole is 2/3, adjust the feeding machine relaxation time.

4. When the straight section of the guide needle is about to leave the material belt when the punch is shaken through 180°, it is necessary to check whether the fixing clip is clamped at this time.

The assistance of CNC machining technology improves the technology of sheet metal processing

Most of the products produced by many sheet metal processing factories now borrow the brand effect of others, rather than forming their own brands. Therefore, the development of the processing industry has many difficulties. Despite this, the processing industry is still working hard on its own, constantly improving its processing technology, and striving to develop and innovate its own processing methods.

For sheet metal processing companies, the current high processing costs are only temporary. I believe that in the near future, they will be able to process high-quality products by themselves. And you can create your own brand, no longer rely on the strength of others, and promote the real development of China’s sheet metal industry. Therefore, the processing industry needs to continuously improve its own technical strength and strive to enhance the brand effect. With the continuous development of the industry, the cost and price of production will be lower and lower. And with the continuous development of this industry, as long as the network platform is used for publicity and more people realize the superiority of sheet metal products, it can prosper rapidly.

Technological progress is advancing rapidly. Since the CNC machine tool was successfully developed in the United States in 1952, it has gone through five stages of development. The maturity of microelectronics and computer technology has promoted the development of my country’s numerical control technology, and the successful development of domestic numerical control system has ensured the quality and performance of my country’s numerical control machine tools. CNC machine tools are widely used in various fields because of their strong adaptability to workpiece modification, high machining accuracy, and high production efficiency.

CNC bending machine is a device that is often used in the processing process. Its essence is the mold after the sheet is bent. It consists of a stand, a workbench and a plywood. By energizing the coil, it creates gravity to sandwich the sheet between the platen and the base. Due to the electromagnetic force clamping method, the pressing plate can be made according to the specific requirements of the workpiece, the operation is simple, and the workpiece with the side wall can be processed.

CNC bending machine is a device that is often used in the processing process. Its essence is the mold after the sheet is bent. It consists of a stand, a workbench and a plywood. By energizing the coil, it creates gravity to sandwich the sheet between the platen and the base. Due to the electromagnetic force clamping method, the pressing plate can be made according to the specific requirements of the workpiece, the operation is simple, and the workpiece with the side wall can be processed.

Motor Housing

METALLECA® Motor housings are widely used in generators and electric motor series. The power of motor is range from 1KW to 20KW. The materials of the housing are no longer limited to steel and pig iron as in the past, then the thin and lightweight stainless steel and aluminum alloy are also more popular. Our production of motor housing is made aluminum alloy and common carbon steel. The housing of the motor has a protective effect and functions as a component mounting frame. In addition, some special models of motor housings also have functions with heat dissipation or sound insulation.

Process Treatment in Stamping Process

Metal stamping is a manufacturing process that uses a metal stamping die or a series of metal stamping dies to shape a sheet of metal into a three-dimensional shape.

Processing in common stamping process:

1 . If the cutting edge is worn and the tensile stress of the material increases, the stamping material has a tendency to rotate and twist. When the material is turned over, the size of the stamping will become smaller.

2Plastic deformation of the material pressure and material will lead to larger size punching. The punch size will be smaller when the pressure is reduced.

We can also supply Stamping Bracket, Sheet Metal Fabrication etc. Welcome to contact us.

What are the influences of the design structure of the stamping die on safety?

Main components, functions and safety requirements of the mold. The convex and concave molds in the workshop generally refer to the working parts that directly shape the blank, because they are the key parts in the mold. The convex ...

五金冲压件加工对弯曲件的要求有哪些?

1. The processing of metal stamping parts is a requirement for bending parts

1. The shape of the bending part should be as symmetrical as possible, and the bending radius should not be less than the minimum bending radius allowed by the material.

2. The curved side is too short and not easy to form, so the straight part of the curved side should be the curved side H>2δ. If H is required to be very short, you need to leave an appropriate margin to increase H, and after bending, cut off the added metal.3. When bending with holes, avoid hole deformation.

2. Requirements for deep drawing parts

1. The shape of metal stamping parts should be simple and symmetrical, and the depth should not be too large. In order to reduce the number of deep drawing, it is easy to form.  

2. The fillet radius of metal stamping parts does not increase the process. Otherwise, the number of deep drawing and shaping will be increased, the number of molds will be increased, waste will be easily generated, and the cost will be increased.

Whether the die used for metal stamping parts is an elastic pressure discharge plate or a fixed discharge plate depends on the size of the discharge force, and the material thickness is the main consideration. The discharge force of the elastic pressure discharge plate is greatly enhanced. Metal stamping parts are formed by applying external force to plates, strips, pipes and profiles by means of presses and dies to cause plastic deformation or separation to obtain workpieces (stamping parts) of the required shape and size.

The Method of Punching Small Holes for Stamping Parts

In this paper, we will introduce the method and points for attention of punching small holes in the processing of stamping parts. With the development of science and technology and society, the previously commonly used machining method of micro holes has gradually been replaced by the stamping method. By making the punch firm and stable, improving the punch strength, preventing punch fracture and changing the stress state of the blank during punching, etc.The ratio d/t of the punching diameter to the material thickness in stamping can reach the following values: 0.4 for hard steel, 0.35 for mild steel and brass, and 0.3 for aluminum.

When punching a small hole on a sheet, when the material thickness is greater than the punch diameter, the punching process is not a shearing process, but a process of extruding the material into the die through the punch. At the beginning of extrusion, part of the washed waste is compressed and squeezed into the area around the hole, so the thickness of the washed waste is generally less than the thickness of the raw material.

When punching small holes in stamping parts, due to the small diameter of punch punch, if common blanking method is used, the small punch is easy to break, so try to improve punch strength to prevent it from breaking and bending. The methods and precautions are as follows:

1. The stripper serves as a guide plate.

2. The guide plate and the fixed working plate are connected by a small guide post guide sleeve or directly with a large guide post guide sleeve.

3. The punch shall be retracted into the guide plate, and the distance between the guide plate and the punch fixing plate shall not be too large.

4. The bilateral clearance between punch and guide plate is less than the unilateral clearance between punch and die.

5. The pressing force is 1.5~2 times greater than that of simple stripping.

6. The guide plate shall be made of or inlaid with high hardness materials, and the thickness shall be 20%~30% compared with the normal situation.

What are the common quality problems of stamping and drawing parts processed by stamping dies?

1. During the stretching process of the wrinkled material, the tangential stress of the surrounding edge part is too large, which causes the instability of the material and causes the product to form uneven wrinkles along the tangential direction of the edge, which is called wrinkling. When the wrinkling is serious, it will also cause the material to be difficult to pass through the gap between the die and the punch during the stretching process, the tensile deformation force will increase, and even lead to cracking. The occurrence of buckling depends not only on the tangential stress at the edge of the material, but also on the thickness of the tensile member. Generally speaking, the stretching die using nitrogen gas spring or excellent release glue has better effect, and it is not easy to appear wrinkling, cracking and other phenomena. Why? Since the force of the nitrogen gas spring or super glue is generally balanced, there is no problem of uneven force. Nitrogen gas springs are better than Uniglue, because the nitrogen springs have strong force and good balance, but the price is several times more expensive than Uniglum, and many factories cannot afford them. Generally, only slightly larger factories can afford to use gas springs. If you use it for a long time, the super glue will shrink and its strength will not be as strong as it used to be. You’ll have to get a new one, but it’s a lot less expensive than a gas spring. The blank holder ring can be used to prevent wrinkling. In some places, it is called a pressing rib, which means that a circle of raised ribs is placed around the material without affecting the post-processing of the product, commonly known as a pressing rib, to press the material. Around. The advantage of this is that the stretched product will be fuller and will also prevent wrinkling.

The blank holder force needs to be relatively adjusted in the mold test. The general design is not so reasonable, and the height of the blank holder needs to be adjusted appropriately according to the specific conditions of the product. If the blank holder force is too large, the friction between the material and the die and the blank holder ring will increase, which will make the material wall thinner or even cracked; if the blank holder force is too small, it cannot effectively prevent wrinkling. .

Second, the second problem is pulling crack, which is a problem often encountered in the stretching process. When the tensile stress on the cylinder wall exceeds the strength limit of the material, the product will crack, and the crack generally occurs at the cylinder wall slightly above the punch fillet.

The factors that affect the deep drawing crack of the product are: the tensile properties of the material, the diameter and thickness of the material, the drawing coefficient, the fillet radius of the concave and convex die, the blank holder force, the friction coefficient, etc. The radius of the rounded corner of the concave and convex die is too small and too sharp, which is easy to cause the product to crack. The general mold repair method is to find a way to increase the rounded corner to make the rounded corner smoother and brighter. Yes, especially stretching oils, are very effective. When designing the stamping die, you can enlarge the fillet as far as the customer’s product allows. Don’t make it too sharp. Some designs are not well understood. The designed drawing die cracked very badly during the die test, and wanted to exhaust the fitter. what! Repairing molds is annoying.

The use of necessary lubricants during stretching is conducive to the smooth progress of the stamping and stretching process and improves the thinning degree of the cylinder wall. But it must be noted that the lubricant can only be applied to the working surface of the die, and cannot be lubricated on the contact surface of the punch and the material, because the punch and the blank surface are a kind of favorable friction, which can prevent Material slips, cracks and thins.

What are the requirements for stamping die processing parts materials?

1. Material requirements for blanking die.

The workpiece material used for thin plate punching dies requires high wear resistance and hardness, while thick plate punching dies require high fracture resistance, flexural strength and toughness in addition to high wear resistance and compressive yield point to prevent the die Broken or chipped.

2. The material requirements of the drawing die.

The material of the parts used in the mold is required to have good anti-adhesion (anti-seize), high wear resistance, hardness, certain toughness and good cutting performance, and the heat treatment deformation is small.

3. Material requirements for cold extrusion die.

Die working parts require high strength, high hardness and high wear resistance. In order to avoid impact fracture, a certain toughness is also required. Because the temperature rise during extrusion will be large, it must have certain heat resistance, fatigue resistance and thermal hardness.

In the work of blanking die, the key to ensure the life of the die is to select the die material reasonably and implement the correct heat treatment process. For different purposes of the mold, according to its working state, stress state, properties of processing materials, production batch, productivity and other factors, compare the above-mentioned required properties, and then select the variety and heat treatment process.

The above content about parts and materials in stamping die processing, stamping parts have good dimensional accuracy, the same die size, commonality and good interchangeability. I hope the above will help readers.

What are the factors that affect the dimensional accuracy of metal stamping parts?

The dimensional accuracy of metal stamping parts refers to the difference between the actual size and the basic size of the stamping parts. The smaller the difference, the higher the dimensional accuracy of the metal stamping parts.

1. The factors affecting the dimensional accuracy of metal stamping parts are as follows

1. Manufacturing accuracy of metal stamping die.

2. The gap of the concave and convex die.

3. The resilience of the material after stamping.

4. Accidental factors in the production process, such as inaccurate positioning, unstable material properties, etc.

5. It can be divided into precision grade and ordinary grade. The ordinary level is the precision that can be achieved by economic means, and the precision level is the precision that can be achieved by stamping technology.

The surface quality of metal stamping parts shall not be higher than the surface quality of raw materials, otherwise it needs to increase the follow-up processing to achieve, and increase the production cost.

Second, the accuracy requirements of metal stamping dies

Many aspects of stamping processing have precision requirements, such as the assembly of metal stamping dies, because this will greatly affect the quality and service life of stamping dies, as well as the quality of formed stampings. So, what are the specific precision requirements for stamping die assembly? please watch the following part.

1. The parts of the stamping die should meet a certain mutual position accuracy, such as: axis, perpendicularity, inclination, parallelism, etc.

2. Fitting accuracy and contact accuracy: Fitting accuracy refers to the fit clearance or interference degree between the surfaces of the parts that cooperate with each other, such as the fit between the cavity and the core, the insert and the template hole, the guide post, the guide sleeve and the template. Contact accuracy refers to the degree of distribution between the contact area and the actual contact points, such as the uniformity of the contact points on the parting surface, the contact area of ​​the locking wedge slope, etc.

3. The moving parts should meet the precision requirements of each mechanism such as rotation accuracy, rotary motion accuracy, and linear motion accuracy.

4. Guidance and positioning accuracy: such as opening and closing motion guidance, installation and positioning of cavity (concave mold) and core (punch mold), sliding motion guidance and positioning, etc.

5. Other precision requirements: for example, the vibration, noise, temperature rise and friction control of the stamping die during operation, as well as the tightening force, deformation, lubrication and sealing of the stamping die during assembly must meet the working requirements of the stamping die .

What are the methods of hardness testing of metal stamping parts?

First, the method of hardness testing of metal stamping parts

The hardness test of metal metal stamping parts adopts Rockwell hardness tester. Small stampings with complex shapes can be used for small test surfaces, which cannot be tested on ordinary benchtop Rockwell hardness testers.

The processing of metal stamping parts includes blanking, bending, deep drawing, forming, finishing and other processes. The processing materials of metal stamping parts are mainly hot-rolled or cold-rolled (mainly cold-rolled) metal sheets and strips, such as carbon steel sheets, alloy steel sheets, spring steel sheets, galvanized sheets, tin-plated sheets, stainless steel sheets, copper and copper. Alloy plate, aluminum and aluminum alloy plate, etc.

The PHP Series Portable Surface Rockwell Hardness Testers are ideal for testing the hardness of these stampings. Alloy stampings are the most commonly used parts in the fields of metal processing and machine manufacturing. Stamping is a processing method that uses a die to separate or form a sheet metal strip. Its application range is very wide.

The main purpose of the stamping material hardness test is to determine whether the annealing degree of the purchased metal sheet is suitable for the subsequent stamping processing. The same type of stamping process requires sheets of different hardness levels. Aluminum alloy plates used for stamping parts can be tested with Webster hardness tester. When the thickness of the material is greater than 13mm, it can be replaced by a barcol hardness tester, and a barcol hardness tester should be used for pure aluminum plates or low-hardness aluminum alloy plates.

In the stamping industry, stamping is sometimes also called sheet forming, but it is slightly different. The so-called plate forming refers to a forming method in which a plate, a thin-walled tube, a thin profile, etc. are used as raw materials for plastic processing. At this time, the preparation of the thick plate direction is generally not considered.

Well, the above is the relevant content about the hardness testing method of metal stamping parts, I hope the above content can help readers.

What are the methods to prevent damage to metal stamping parts?

1. How to prevent the damage of metal stamping parts?

1. The type, specification and function of the selected hardware accessories should conform to the current specifications and relevant regulations, and high-quality plastic steel doors and windows should be selected to match.

2. For sliding windows with a width of more than 1 meter, or doors and windows with double-glazed equipment, it is easy to set up double pulleys, or choose to use rolling pulleys.

3. The sliding brace hinge cannot use aluminum alloy material, but stainless steel material should be used.

4. When using fastened screws to equip hardware, it is necessary to have a metal lining inside. The thickness of the lining should be at least twice the pitch of the fasteners, and must not be fastened to plastic profiles or non-metal linings.

5. After all, hardware accessories gold should be equipment, door and window locks, handles, etc. It should be assembled after the sash is framed to ensure proper orientation and movement of the switch.

6. The metal stamping equipment needs maintenance in the later stage to prevent rust and corrosion. In daily use, it should be lightly closed and lightly opened to prevent hard closing and hard opening, which will cause damage and no noise. With the current nylon wheel, it is not only noiseless, but also smoother and lighter, and its service life is not shorter than the above pulley, so that the (door) window can run normally and smoothly, choose high-quality pulley for (door) window, and inferior pulley from On the surface, the workmanship is rough, not smooth, the sliding is not active, and it is small and light.