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What kind of hardness tester should be used for different metal stamping materials

Stamping parts processing factory, processing metal stamping parts, stainless steel stamping parts, various mechanical accessories, with the development of society, stamping products have been applied to various fields, metal stamping parts used materials are also divided into many kinds, making metal stamping parts, we need to understand the characteristics of products, material performance, among them, we also need to test the hardness of metal stamping parts The main purpose is to determine whether the annealing degree of the purchased sheet metal is suitable for stamping parts processing;

Different kinds of metal stamping parts processing technology, need different hardness level of the plate. Each kind of plate hardness detection has a specified hardness tester to measure, let’s take a look at it;

1. Hot rolled steel plate is usually relatively thick, and it is generally stipulated to use Brinell hardness tester to test hardness and Rockwell hardness tester to test hot-rolled steel plate; HRB scale can be used and portable Rockwell hardness tester can be used to test hot-rolled steel plate without sampling, and the operation is simple;

2. The hardness of cold-rolled steel sheet used for processing metal stamping parts is mainly measured by Rockwell hardness tester, usually HRB scale is used, and HRC scale is used for harder steel plate;

3. The material of the thin plate can be made of either the Vickers hardness tester or the surface Rockwell hardness tester hrn or HRT scale;

4. The hardness of brass plate used for metal stamping parts can be tested by HRB scale of Rockwell hardness tester, and HRF scale can be used for softer brass and copper plate;

5. The aluminum alloy plate used for processing metal stamping parts can be tested by Vickers hardness tester. When the material thickness island is 13mm, the Babbitt hardness tester can be used, and the bus hardness tester should be used for pure aluminum plate or low hardness aluminum alloy plate;

The main material of stamping die is die steel, and sometimes cemented carbide is used. The stamping die usually requires high hardness and wear resistance, and heat treatment is essential. The hardness of die steel is tested by Rockwell hardness tester. When the die is large and inconvenient to move, Leeb hardness tester can be used. In order to improve the surface hardness and wear resistance, many metal stamping dies and Die accessories need surface heat treatment, such as surface nitriding;

What problems should be paid attention to when designing stretch metal stamping parts?

Stretch forming is a stamping process in which the plate is formed into an open hollow part using a processing method. As one of the main stamping processes, drawing has been widely used. The drawing process can be used to manufacture thin-walled metal stamping parts with irregular shapes such as cylindrical, rectangular, trapezoidal, spherical, conical and parabolic. If combined with other stamping processes, more complex parts can be produced.

1. The design of drawing hardware stamping parts should be simple and symmetrical as far as possible, and can be drawn once. In the design of drawing parts, it should be noted that the external or internal dimensions must be guaranteed;

2. The wall thickness tolerance or thinning of metal stamping parts in deep drawing should not exceed the variation law of drawing process wall thickness. Generally, the maximum thickness of tube wall is (0.2 ~ 0.3) t, and the maximum thinning amount is (0.1 ~ 0.18) t, where t is the sheet thickness.

3. For the workpiece to be drawn for several times (H ＞ 0.5d), the inner and outer walls or flange surface of flange drawing parts shall be allowed to have indentation during drawing.

4. On the premise of ensuring the assembly requirements, the side wall of the drawing part should be allowed to have a certain slope.

5. All dimensions not noted on the part drawing belong to free dimension. The dimension tolerance can be determined according to IT14 level by looking up the tolerance table. The dimension in the diameter direction and height direction of the part meets the requirements of the part tolerance grade in the drawing process.

What are the advantages of metal spring stamping?

In the stamping process of metal spring piece, because the high-speed punch is used, the risk coefficient is relatively high. If the operation is improper, the mold will be seriously damaged, and the safety of the operator will also be hurt. Therefore, when the mold needs to be off the machine, remember to implement the following operation to ensure the safety of the mold and operators

There are two kinds of status of hardware spring die, normal and abnormal

1、 Hardware shrapnel is normally off the machine:

1. Turn the punch to “inching” and turn off the counter;

2. Use the inching switch to set the punch to the bottom dead point (180 °) and cut off the material belt; prevent the belt from cutting when the die is dead, which may cause deformation of the belt and damage of the die parts

3. Loosen the upper and lower die screws

4. Hit the punch to the top dead center and pull the die to the base of the die car together. Two people are required to finish the die drawing. One person is not allowed to pull the die to ensure safety

5. It is necessary to pull the die car away from the punch for a certain distance before lowering the height of the die car, so as to prevent the die car from getting stuck in the way of the punch and forming the sliding of the die

6. The locking screw, scissors, material hook, flashlight, etc. should not be placed on the operation surface of the punch when the mold is lowered

2、 Hardware shrapnel is out of order:

1. Turn off the power supply and counter of the host computer;

2. After the flywheel is completely broken off, place plastic or paper core on the front and rear diagonal stop column of the mold. Do not place it between the stripper plate and the mold core fixing plate, or place iron block in the mold instead of plastic

3. Swing the flywheel with safety rod (do not pull the flywheel by hand or use safety rod to stop flywheel operation before the flywheel is interrupted) and stick the upper and lower stop posts

4. Loosen the upper and lower die screws, pull the flywheel to 0 ° to 70 ° with safety rod, and then pull the die down

3、 Precautions for dismounting hardware shrapnel:

1. Before pulling the mold, it is required to acknowledge that the support plate of the feeding port of the mold has been loosened and removed

2. When the mold can not be pulled, one person can pull out and one person can push backward. (avoid pushing backward together to push the mold out of the punch). It can also be used to screw the screw hole of the lower die base and lift both hands up a little and then pull it out

3. When the die is pulled away from the punch, the die car shall not turn too fast to prevent the guide plate or the data support plate from hanging on the punch or the sound insulation cover of the punch, which may cause damage to the die parts or slide of the die

4. It is not allowed to move the mold when it is abnormal, especially after the mold height stop column is padded with plastic

5. Turn off the main machine and other power supply after the die is lowered to prevent capital waste

6. When the mold is shut down normally, it is necessary to move the mold inching until the guide needle enters the round hole of the tape. (to prevent the data formed by the feeder not holding the data when there is no air pressure, which causes the wrapping tape.) stop the mold from stopping at the bottom dead point. (it is easy to reduce the service life of the tension spring in the mold.)

Attention should be paid to the maintenance of metal stamping parts after installation

Attention should be paid to maintenance of metal stamping parts after installation to prevent rusting and corrosion. In daily use, it is necessary to close and open gently to prevent damage caused by hard closing and hard opening. There is no noise, there are now nylon wheels. It not only has no noise when pushing and pulling, but also is more smooth and light, and its service life is not shorter than the above various pulleys. To make (door) window normal and smooth operation, it is necessary to select a high-quality pulley for (door) window. Poor quality pulley from the surface, the workmanship is relatively rough. It’s not smooth. It is not flexible to slide, small and light.

Hardware spring piece belongs to the category of hardware stamping parts and electronic hardware data. Selection of stainless steel or manganese material after heat treatment is a primary component of the switch, with the help of the conductivity of metal shrapnel, it plays an excellent switch role between the operator and the commodity. Together, the safe resilience (automatic return after pressing) and super long life span of the pot are used to provide excellent tactile response for operators.

In the production of metal stamping parts, in order to meet the needs of different stamping work, different types of presses are used. There are many types of press, which can be divided into mechanical pressure and hydraulic press according to different transmission modes. Among them, mechanical press is the most widely used in stamping production. With the development of modern stamping technology, high-speed press and CNC rotary head press are widely used.

Common faults of metal stamping parts

In the progressive die, the shape of the metal stamping part is formed by punching the surplus material around the stamping part. The main reason of turning over and twisting is the influence of blanking force. During blanking, due to the existence of blanking clearance, the material is stretched on one side of the female die (material warps upward), and the side close to the punch is compressed. When the unloading plate is used, the unloading plate is used to compress the material to prevent the material on the die side from warping upward. At this time, the stress state of the material changes correspondingly. With the increase of the pressing force, the material near the punch side is stretched (the compression force tends to decrease), while the material on the die surface is compressed (the tensile force tends to decrease). The overturning of stamping parts is caused by the stretching of the material on the die surface. Therefore, when blanking, pressing and pressing the material is the key to prevent the stamping parts from turning over and twisting. The causes and Countermeasures of turning over and twisting of stamping parts during bending.

It is caused by the burr of the blanking part. It is necessary to study the cutting edge and check whether the blanking clearance is reasonable.

When blanking, the stamping parts have been turned over and twisted, which leads to poor forming after bending, which needs to be solved from the blanking station.

It is caused by the instability of stamping parts during bending. Mainly for U-shaped and V-shaped bending. In order to solve this problem, the key to solve the problem is to carry out the lead position before bending and during the bending process, and to hold down the material during the bending process to prevent the stamping parts from sliding during bending.

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Processing characteristics of metal stamping parts

Metal stamping parts used by the die known as stamping die, referred to as the die. Stamping die is a special tool for batch processing materials (metal or nonmetal) into required stamping parts. The stamping die is very important in stamping. If there is no die that meets the requirements, it is difficult to produce in batch; if the technology of stamping die is not improved, the stamping process can not be improved. Stamping process and die, stamping equipment and stamping materials constitute the three elements of stamping process. Only when they are combined with each other can stamping parts be produced.

Compared with other processing forms such as mechanical processing and plastic processing, metal stamping processing has many advantages in terms of technology and economy. The main manifestations are as follows:

(1) Generally, there is no chip and broken material in stamping, the consumption of material is less, and other heating equipment is not needed. Therefore, stamping is a kind of material saving and energy-saving processing method, and the production cost of stamping parts is low.

(2) as like as two peas in the stamping process, the stamping parts are ensured to have the size and shape accuracy, and generally do not damage the surface quality of stamping parts, while the die life is generally longer.

(3) Metal stamping parts can process parts with large size range and complex shape, such as stopwatch of clock and watch, longitudinal beam of automobile and cage cover. In addition, the cold deformation hardening effect of materials during stamping makes the stamping strength and rigidity higher.

(4) The production efficiency of metal stamping parts processing is high, and easy to operate, and easy to realize mechanization and automation. Because stamping depends on the stamping die and stamping equipment to complete the processing, the ordinary press stroke times per minute can reach dozens of times, high-speed pressure can reach hundreds or even more than 1000 times per minute, and each stamping stroke can get one punch, so the production of metal stamping parts can achieve high-efficiency mass production.

Because of the superiority of stamping, metal stamping parts processing is widely used in various fields of national economy. For example, in aerospace, aviation, military industry, machinery, agricultural machinery, electronics, information, railway, post and telecommunications, transportation, chemical industry, medical appliances, daily electrical appliances and light industry, there are stamping processing. Not only is it used by the whole industry, but everyone has direct contact with stamping products: for example, there are many large, medium and small stamping parts on airplanes, trains, automobiles and tractors; the body, frame and rim of cars are all processed by stamping. According to relevant investigation and statistics, 80% of bicycles, sewing machines and watches are stamping parts; 90% of TV sets, tape recorders and cameras are stamping parts; there are also metal food cans, steel precision boilers, enamel pots and bowls and stainless steel tableware. All of them are stamping products, and even the computer hardware can not do without stamping parts.

However, the dies used in metal stamping process are generally special. Sometimes, a complex part needs several sets of dies to process and form. The mold manufacturing precision is high, and the technical requirements are high, which is a technology intensive product. Therefore, only in the case of a large number of stamping parts, the advantages of metal stamping can be fully reflected, so as to obtain better economic benefits.

Cold stamping knowledge of metal stamping parts

The metal stamping parts are light in weight, thin in thickness and good in rigidity. Its dimensional tolerance is guaranteed by the mold, so the quality is stable and can be used without mechanical cutting. The metal structure and mechanical properties of cold metal stamping parts are better than the original blank, and the surface is smooth and beautiful. The tolerance grade and surface state of cold metal stamping parts are better than that of hot metal stamping parts.

Large quantities of small and medium-sized parts are usually produced by compound die or multi station continuous die. With the modern high-speed multi position press as the center, equipped with strip material uncoiling, correction, finished product collection, transportation, mold warehouse and rapid die change device, and using computer program control, it can form a high productivity automatic metal stamping production line. By using new die materials and various surface treatment technologies and improving the die structure, high-precision and long-life metal stamping die can be obtained, so as to improve the quality of metal stamping parts and reduce the manufacturing cost of metal stamping parts.

The technology and equipment of metal stamping production are developing continuously. In addition to the traditional use of press and steel mold to manufacture metal stamping parts, various special metal stamping forming processes, such as hydraulic forming, spinning forming, superplastic forming, explosive forming, electro-hydraulic forming and electromagnetic forming, are also developing rapidly, which improves the technical level of metal stamping to a new height. The stamping process of special hardware is especially suitable for the production of various kinds of small and medium-sized parts (even dozens of pieces). For ordinary metal stamping process, simple mold, low melting point alloy mold, group mold and metal stamping flexible manufacturing system can be used to organize the metal stamping processing of various varieties of small and medium-sized parts.

Overview of metal stamping parts

Hardware: steel or some non-ferrous metal parts, processing means: cold / hot stamping, extrusion, rolling, welding, cutting, and other processes, including a wide range of definitions.

Stamping parts: most used in hardware processing, refers to the steel / non-ferrous metal and other sheet metal dies at room temperature, which are formed to the specified shape by the pressure required for processing by the press.

Metal stamping parts are widely used in various fields of our life, including some electronic devices, auto parts, decorative materials and so on. We usually refer to cold stamping parts. For example, a piece of iron plate, if you want to turn it into a fast food plate, you must first design a set of mold. The working surface of the mold is the shape of the plate. Pressing the iron plate with the mold will become the plate you want. This is cold stamping, that is, stamping the metal materials directly with the mold.

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