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  • Dongguan Longwang Hardware Co.,Ltd

  •  [Guangdong,China]
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Dongguan Longwang Hardware Co.,Ltd

Dongguan Longwang Hardware Co.,Ltd

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Inicio > Información de la industria > Stamping process classification

Información de la industria

Stamping process classification

2018-12-27 03:50:03

Stamping process can be roughly divided into two categories: separation process and forming process (bending, drawing, forming). The separation process is to separate the stamping parts and blank along a certain contour line in the stamping process. At the same time, the quality of the separation section of the stamping parts must meet certain requirements. The forming process is to make the blanks deform plastically without damage and turn them into the required shape of finished products. At the same time, it should also meet the requirements of dimensional tolerance and other aspects.
According to the temperature of stamping, there are two ways: cold stamping and hot stamping. This depends on the strength, plasticity, thickness, degree of deformation and equipment capacity of the material, while the original heat treatment status and final service conditions of the material should be considered.
1. Cold stamping metal processing at room temperature is generally applicable to blank with thickness less than 4mm. Advantages are no heating, no oxide, good surface quality, easy to operate, low cost. The disadvantage is that there is the phenomenon of machining hardening, which makes the metal lose the ability of further deformation when serious. Cold stamping requires that the thickness of the blank is uniform and the fluctuation range is small, the surface is bright and clean, no spots, no scratches and so on.
Hot stamping a process in which metal is heated to a certain temperature range. Advantages can eliminate internal stress, avoid hardening, increase the plasticity of materials, reduce deformation resistance, reduce the power consumption of equipment. (source: China machinery network)
1. Die structure: die is a tool to separate or deform sheet metal. Typical die structure is shown in figure 3-17, which consists of upper die and lower die. The handle of the upper die is fixed on the slider of the punch, moving up and down with the slider, while the lower die is fixed on the working table of the punch.
Punch and concave die are the working parts of punch die to deform or separate billet. The upper and lower formwork are respectively provided with guide sleeves and guide posts to guide the punch and the concave die alignment. The guide plate and locating pin are used to control the blank feeding direction and length respectively. The function of the discharge plate is to make the workpiece or blank come off the punch after stamping.
2. Classification of die
Punching die is an indispensable die in stamping production. Die can be basically divided into three types: simple die, continuous die and composite die.
(1) simple punch a simple punch is a punch that completes only one process in one stroke of the punch. Figure 3-17 is the simple die for blanking or punching. The assembly drawing of the simple die is shown in figure 3-18. When working, the strip is sent along the two guide plates 9 on the die until it meets the locating pin 10. Punch down, punch parts (or waste) into the hole, and the strip clamps the punch and with the punch back up movement. When the strip hits the unloading plate at 8 (fixed on the die), it is pushed down so that the strip continues to be fed between the guide plates. Repeat with the second part.
(2) in the first stroke of a continuous die punching machine, a mold that simultaneously completes several stamping processes on different parts of the die is called a continuous die, as shown in FIG. 3-19. When working, the positioning pin 2 is aligned with the positioning hole that has been rushed out in advance, the upper die moves downward, the punch 1 carries out blanking, and the punch 4 carries out punching. When the upper die returns, the unloading plate 6 pushes the waste from the punch. At this point, the blank 7 is sent forward to perform the second blanking. This cycle is carried out, each feeding distance is controlled by the retaining pin.
(3) composite die in a stroke, in the same part of the mold at the same time to complete several stamping process die, known as composite die, as shown in figure 3-20. The biggest characteristic of compound die is that there is a convex and concave die 1 in the die. The outer circle of the convex and concave die is the cutting edge of the blanking punch, and the inner hole becomes the deep drawing concave die. When the slider moves down with the convex and concave die, the strip is first blanked in the convex and concave die 1 and the blanking concave die 4. The blanking part is supported by the drawing punch 2 in the lower die. When the slider continues to move downward, the concave die moves downward to conduct the drawing. Ejector 5 and unloader 3 push deep drawing piece 9 out of the mold in the return stroke of the slider. Compound die is suitable for stamping parts with large output and high precision.
The main basic processes of stamping include blanking, punching, bending and drawing.
(1) blanking and punching blanking and punching are the procedures for separating billets, as shown in figure 3-21 below.
Blanking and punching process is exactly the same, but the use is different. When blanking, the separated part is the finished product, and the remaining periphery is the waste; Punching is to obtain the hole, the punching plate is finished product, and the separated part is waste. Blanking and punching are collectively referred to as blanking. The punch and die of the blanking die have sharp cutting edges, and the gap between the punch and the die is equal to 5% to 10% of the thickness of the plate, so as to ensure the cut is neat and less burr.
(2) bending bending is to enable the workpiece to obtain various shapes of bending Angle. The working part of bending die that makes the workpiece bend should have an appropriate radius r, so as to avoid cracking when bending the workpiece, as shown in figure 3-22.
(3) deep drawing: deep drawing is the process of making the flat slab into cup or box parts. The punch of the drawing die and the edge of the die shall be rounded to prevent the workpiece from being pulled apart. The gap between the punch and the die should be slightly larger than the thickness of the plate (generally 1.1-1.2 times the thickness of the plate) to reduce friction. In order to prevent wrinkles, the blank edge shall be pressed with a pressing plate (edge ring), as shown in FIG. 3-23. The actual drawing process of the product will produce the defects of drawing crack, please see
Sheet metal stamping is an additive method to separate or deform sheet metal by means of punching die. In most cases, the sheet material does not need to be heated, so it is also called cold stamping, also referred to as cold stamping or stamping.
Commonly used plate is low carbon steel, stainless steel, aluminum, copper and its alloy, they are plastic high, deformation resistance is low, suitable for cold stamping processing.
Sheet metal stamping is easy to realize mechanization and automation, high production efficiency; The stamping parts have accurate dimensions and good interchangeability; Smooth surface, no mechanical processing; Widely used in automotive, electrical, instrumentation and aviation and other manufacturing industries.
3. 2. 1 punch structure and working principle
There are many types of punch, the commonly used open punch as shown in figure 3-16. The motor 4 drives the big flywheel 9 to rotate through the triangle belt 10. When the pedal 12 is pressed, the clutch 8 connects the big flywheel with the crankshaft and rotates, and the slider 11 moves up and down along the guide rail 2 through the connecting rod 5 for stamping processing. When the pedal is released, the clutch is released, brake 6 immediately stops crankshaft rotation, so that the slider stops in the highest position.
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