Sheet metal stamping parts: common quality problems
What is sheet metal stamping?
Sheet metal stamping is the use of stamping dies to apply external pressure to various materials such as metal sheets, metal pipes, and metal bars through hydraulic presses or mechanical presses to deform and separate the metal materials to obtain a product design suitable for the structure of the mold cavity. production method.
Sheet metal stamping parts are widely used in various industries and are suitable for a variety of metal sheet materials, mainly including: carbon steel, stainless steel, cold-rolled steel, aluminum alloy, copper alloy, galvanized steel, titanium alloy, etc. Sheet metal stamping does not change the properties of the material during processing. The material is transformed into products of various shapes, sizes and properties by pressure, which is very suitable for the manufacture of large sheet metal parts with low cost, high efficiency and uniformity. gender and other characteristics.
Stamping dies, materials, and stamping equipment are the three most important elements in the stamping manufacturing process.
The most important thing in the stamping manufacturing process is the design and manufacture of stamping dies. Cutting, forming and straightening are the three main functions of stamping dies. Through professional stamping engineers, a series of stamping manufacturing processes are skillfully formed, and finally the highest quality precision stamping parts are obtained. According to different molds, it can be divided into precision stamping services, progressive die stamping, composite die stamping, deep drawing stamping and other manufacturing processes.
High-quality stamping dies can be manufactured in batches and with high efficiency. Although the cost of the mold requires a higher investment, as more and more products are put into the market, the cost of the mold will be ignored. In addition, with the continuous upgrading of manufacturing technology, you can choose to use fully automatic CNC punching equipment, which can greatly reduce labor costs, and you don't need to worry about dimensional deviation errors of high-quality molds.
In order to make the material in the mold deform better, the material with higher hardness is heated during the stamping process to become a hot stamping part; while the stamping process of the material with lower hardness and better formability is called cold stamping, which is usually suitable for Sheet material.
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Frequently Asked Questions about Sheet Metal Stampings.
glitch:
Under the impact of external force, the metal sheet will be cut with the mold closed, removing excess material. However, there are often material fragments at the edge of the material port, which become burrs, affect the use of the product, and even hurt human skin, causing unnecessary troubles.
Generally speaking, the appearance of burrs is related to the precision of the mold. When there are too many air holes between the upper and lower parts of the mold, the cutting material is not fast enough and not neat enough, and the metal chips are deformed to form burrs, resulting in a decrease in mold precision and burrs. quality problems. risk.
Usually we will carry out precision machining on the mold, adjust the combined clearance of each part to the minimum, maintain the hardness and precision of the mold, and reduce the appearance of burrs.
Uneven material surface:
Deformation of sheet metal under pressure is usually due to metal scrap or chips inside the mold or on the material. The mold and workbench must be cleaned before stamping to avoid damage to the surface of the product by waste.
Regular seal:
This is mostly due to metal shavings and foreign matter adhering to the material conveying roller, and markings appear at regular intervals. Therefore, when the coil is running on the automatic feeder, it must be cleaned and inspected regularly.
Material edge damage:
This is mostly because the coil is on the edge of the automatic feeder, the effective gap is too small, and the conveyor is damaged during the conveying process, which will affect the closing of the mold, thereby affecting the accuracy of the product.
Scratches:
It is a very common problem to scratch the surface of the material due to the transportation and handling of the material. Therefore, in the process of material transportation and handling, it is necessary to fully protect the material, prevent the material from being scratched and damage the mold, and check the quality of the material before the stamping process.
The damage of the mold will also cause the product to be scratched, so it is necessary to check the mold regularly, eliminate hidden dangers, and repair the mold immediately.
cracking:
Typically, metallic materials are analyzed and tested before being put into production. Materials of different hardness and yield strength require different mold designs.
When the material has high hardness and poor plasticity, the blank holder force of the mold is too large, resulting in the failure of the material to be formed. 1. If the bottom material is cracked, the hardness of the material or the blank-holding force of the mold should be adjusted appropriately.
side wrinkles
During the stamping process of the product, wrinkles appear on the side, indicating that the mold fit space is too large, or the thickness of the material is reduced, so that the material cannot stick to the mold. Wrinkles.
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