Stainless steel stamping processing is by punching press. It dies on the plate material to produce plastic deformation or separation and then obtains the required shape and size of the workpiece (stamping parts) forming processing method. Stainless steel stamping and forging belong to plastic machining (or pressure machining), collectively known as forging. The main components of the blank stainless steel stamping parts are hot-rolled and cold-rolled steel plates and steel strips.
Around the world, 60 to 70 percent of steel is sheet alloy material, most of which is manufactured by stamping. The automobile body, chassis, oil tank, radiator piece, boiler drum, container shell, motor, electronic and electrical core silicon steel sheet, etc., are stamping processing. Instruments, household appliances, bicycles, office machinery, and utensils are needed in life, and for other products, there are also many stamping parts.
Compared with casting and forging, stainless steel stamping parts are thin, uniform, light, and strong. Stamping materials can be manufactured by other methods for difficult manufacturing with stiffeners, ribs, and undulating or flanging workpiece processing to improve their stiffness. Due to the use of the precision mold, the precision of the workpiece can reach a micron level and above, the repetition precision is high, the specification is consistent, and it can punch out the hole, socket, boss, etc.
Stainless steel stamping processing is the most efficient production method, the use of a composite die, especially the use of a multi-process die, can be completed in a punching press multi-channel stamping process to achieve the automatic production from strip material uncoiling, leveling, punching to forming, finishing. High production efficiency, good working conditions, and low production cost generally can produce hundreds of pieces per minute.
Four kinds of stainless steel material stamping forming process
The stamping forming properties of stainless steel are divided into bulging forming properties, flanging forming properties, expanding forming properties, and bending forming properties. To understand the performance of river compaction, we must first understand the stamping process. Stainless steel material stamping forming processing technology: deep drawing process, bulging process, flip
River art of deep drawing forming
Deep drawing is a stamping method that uses a special die to make open hollow parts from flat blank obtained after blanking or cutting. The characteristic is that the sheet material can flow to the concave die under the drive of the punch; that is, the forming depends on the fluidity and elongation of the material.
Bulging forming process
Bulking is a stamping process in which the thickness of the billet is reduced, and the surface area is increased by forcing the die to obtain the geometric shape of the parts.
It is characterized that the blank being crushed by the blank holder ring and cannot flow into the die. It is formed completely by the extension of the material itself.
Flanging forming process
Flanging is a stamping process that uses a die to turn the blank’s hole edge or outer edge into a vertical edge.
In the middle stage of round hole flanging, the material under the punch has not been completely transferred to the side; if the deformation stops, it will get another shape; this forming method is called hole reaming, and production application is also very common.
Bending forming process
Bending forming is the forming method of bending stainless steel sheet material, bar material, pipe material, or profile into a certain shape and Angle parts.
Stainless steel stamping corrugations
Stainless steel wrinkling reason: when the metal is the radial character through the tensile ring to flow inward, the compression force may lead to wrinkles, and the fixture will prevent such wrinkles. The metal flows unevenly or without the support of stretching rings, and wrinkles can begin to develop. Thin materials require more holding force than thick ones.
Stainless steel stamping process how to control the fixed force
1. The pressure will increase with a flat surface as the metal flows under the pad. If the pad is designed at a slight Angle, the fixing force will increase. This MAKES THE stamping MORE REGULAR, BUT WRINKLES MAY OCCUR outside the drawing RING, WHICH IS NOT a CONCERN IF THE FLANGE IS CUT LATER. The purpose of this design is to control the flow of metal into the stretch ring effectively.
2.A stamping ball can be added to the fixed pad, and a corresponding groove can be added below to stop the inward flow of metal further.
How to overcome the deformation of stainless steel stamping plane
The turnover of stainless steel stamping parts is due to the concave die surface of the material by tensile. So when blanking, pressing and pressing the material is the key to preventing the blanking parts from turning over and twisting. The method of suppressing the turning and twisting of stainless steel stamping parts Reasonable die design. In progressive die, the arrangement of cutting order may affect the forming accuracy of stamping parts. For the stainless steel stamping parts of the small parts of the blanking, generally, first, arrange a large area of blanking, then arrange a smaller area of blanking to reduce the impact of blanking force on the forming of stainless steel stamping parts. Hold the material down. To overcome the traditional mold design structure, a material holding gap is opened on the unloading board (that is, when the mold is closed, the unloading board and the concave die are fitted, and the gap between the unloading board and the concave die where the material is accommodated is t-0.03 ~ 0.05mm). This way, the unloading plate can move smoothly during stamping, and the material can be compressed. The key forming part, the unloading board, must be made into a block-type structure to facilitate the solution of long-time stamping caused by the unloading board pressure part of the wear (pressure) loss and can not press the material. Add strong pressure function.
The critical part of the unloading insert is thickened (the normal thickness of the unloading insert is H+0.03mm) to increase the pressure on the concave die side material to suppress the turning and distortion of the stamping part during punching cutting. The cutting edge of the punch is trimmed with a bevel or arc. This is an effective way to reduce blanking force. Slowing down the blanking force can reduce the tensile force of the concave die side material to inhibit the stamping parts from producing the effect of turning over and twisting. In daily die production, attention should be paid to maintaining the sharpness of the cutting edge of punching and concave die. When the cutting edge is worn, the tensile stress of the material will increase, so the tendency of the stamping parts to turn over and twist is increased. The unreasonable or uneven blanking clearance is also the reason for turning over and distortion of stamping parts, which needs to be overcome. Production and dealing with the problems in common in the daily production will meet punching small or large size (likely beyond specification). The punch size is large; in addition, to consider the design of the forming of convex and concave die size, machining accuracy and blanking clearance, and other factors, we also should consider the following several aspects to solve. When the cutting edge is worn, the tensile stress of the material increases, and the tendency to turn over and twist stainless steel stamping parts increases. When metal stamping parts turn over, the punching size will be smaller. The strong pressure on the material produces plastic deformation, leading to a large punching size. When the pressure is reduced, the punching size will be smaller. The shape of the punch edge end. Such as the end of the slope or arc; due to the reduction of punching force, punching pieces are not easy to produce turning-over and distortion. Therefore, the punching size will be larger. When the punch end is flat (no slope or arc), the punching size will be relatively small. In the concrete production practice, we should analyze specific problems to find the method to solve the problem.
The above mainly introduces blanking, blanking pieces produced turning, distortion reasons, and solutions. The causes of turning over and distortion of stainless steel stamping parts during bending and countermeasures to the burrs caused by blanking. Need to study the cutting edge, and pay attention to check the blanking clearance is reasonable. During blanking, the blanking parts have turned over and distorted deformation, resulting in poor forming after bending, which needs to be solved from the blanking station. Instability of stainless steel stamping parts during bending. Mainly for U-shaped and V-shaped bending. The treatment of this problem, the leading position before bending of stainless steel stamping, the leading position in the bending process, and the pressing material in the bending process to prevent the sliding of stainless steel stamping in bending is the key to solving the problem.