Metal Deep Drawing Die

Professional precision stamping die supplier

High precision stamping quality suppliers

 product description

In the existing aluminum alloy liner drawing process, the aluminum alloy liner is usually processed by turning into a semi-finished product whose open end has a wall thickness greater than that of the rest, and then is sizing and stretched through the existing concave and convex molds to obtain The finished product that the user needs. The punch and die can replace the above turning steps, and use their own shape characteristics to punch and stretch the aluminum alloy liner, so as to obtain the aluminum alloy liner whose open end has a greater wall thickness than the other parts. Compared with turning, it has Features of low material cost and high processing efficiency

Dongfang Mould specializes in the production of metal stamping parts and stamping dies. The existing well-known cooperative customers: Haier Group, Shanxi Coking Coal Group, Hanken Electromechanical, etc.

Service Process

1. Customers provide drawings (format: CAD, PDF, STP) or physical samples. If customers need to change, our factory can provide better suggestions or cases. If you cannot reply in time, please send the picture to the mailbox and reply to you as soon as possible.

2. Commitment to do our best to save costs for customers and provide reasonable quotations. Quality, delivery, after-sales and attitude are equally important.

3. The delivery method is negotiated by both parties. Most of the products are delivered by express delivery, and the more distant products are delivered by logistics. If there is any loss or defect when signing for the receipt, please contact us immediately.

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Causes and elimination methods

(1) Product shape.

① The drawing depth is too deep.

Since this defect is generated during deep drawing, it can be resolved if the drawing depth is reduced. However, when drawing must be carried out according to the drawing size requirements, there are many examples of other methods to solve the problem.

② rd and rc are too small.

Since this defect occurs when the corner radius (rc) of the square tube is too small, rc should be increased. When the die fillet radius (rd) is small and deep drawing is performed, there is a risk of wall cracking. If cracks occur, grind well (rd) and increase it

(2) Stamping conditions.

① The blank holder force is too large.

As long as there is no wrinkle, the blank holder force can be reduced. If wrinkling is the cause of rupture, you must be cautious in reducing the blank holder force. If a thin wrinkle occurs on the entire flange, and the crack is still shiny, it may be because the height of the buffer pin is not processed well, the precision of the mold is poor, the precision of the press is low, the parallelism of the blank holder is not good, and A local cause such as an impact occurred. Corresponding measures must be taken. Whether there are any of the above factors can be judged by the impact traces. If the impact traces are normal, the shape will be neat, and if they are not neat, there must be a problem somewhere.

② Poor lubrication.

The choice of processing oil is very important. The way to distinguish whether the lubricant is suitable is that when the product is taken out of the mold, if the temperature of the product is too high to be touched by hands, the choice of lubricant and the method of lubrication must be reconsidered. In the deep drawing process, one of the most important factors is that the oil film of the lubricating oil cannot be broken. The temperature of the side wall of the punch increases and the material softens, which is the cause of the failure. Therefore, when deep drawing is carried out, the friction caused by deep drawing should be minimized. In addition, it is also necessary to consider an active cooling scheme at the same time.

③ The rough shape is improper.

According to experience, when wall rupture occurs in the trial drawing stage, the defect can be eliminated by changing the shape of the blank. There are many examples of this. When drawing a square tube, first use a square blank for deep drawing. If the rd part is cracked, the four corners of the blank are cut. At this stage, if inverted W-shaped cracks and grid defects occur, it means that the corners of the four corners are too large. The shape of the cut corners, such as the four corners of the flange during deep drawing, can be eliminated as long as the amount of cut corners is appropriately reduced, and it can also prevent cracking.

　　④ Poor positioning.

Even if the amount of chamfer is appropriate, if the blank is not positioned correctly, it will be as if the chamfer is too large, and cracks will still occur. In addition, when the three-point positioning device is used in mass production, the positioning depends entirely on the operator's hand, and the wall often breaks.

　　⑤ The buffer pin is in poor contact.

As long as the length of the buffer pin is adjusted appropriately, the defect can be eliminated.

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