[China Aluminum Industry Network] The aluminum alloy sheet metal forming process is influenced by many factors such as material forming performance, process parameters and mold design, lubrication and friction conditions, and is still a new sheet metal forming press for further research and development. technology. If it breaks out, it can provide efficient forming technology—average production parts per hour (ASPH) is greater than 540 pieces.
Set screw is also called head screw and positioning screw. The utility model is a screw specially used for fixing the relative position of machine parts. Type: square flange end set Bolt, GB / t821-1988 square chamfered end set screw, GB / t85-1988 square long cylindrical end set screw, inner square head set screw, etc.
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The selection of common set Screws is generally used to fix the relative position of two parts with little force. The axial and circumferential positioning of common sleeve like parts on the shaft. There are many kinds of set screws. The common ones are as follows: according to the end part, there are conical end, flat end, concave end, oblong cylinder head, etc; Set Screws,Allen Nose Set Screw,Slotted Head Set Screw,Hexagon Socket Grub Screw Suzhou Gubao Screws Co.,Ltd. , https://www.gbscrewes.com
In recent years, aluminum alloy plate warm forming technology has begun to be applied to automobile bodies. Figure 11 shows the aluminum sheet stampings of the SAW sedan body outer cover of Hunan University. At present, there are still some deficiencies in the stamping technology of sheet metal temperature forming stamping for body aluminum sheet, which is mainly manifested in the following aspects.
(1) Formability needs further improvement. The aluminum alloy sheet has poor local drawability and is prone to cracks, particularly in parts with relatively complex shapes.
(2) In order to avoid pulling cracks, stamping and stretching are often insufficient, and as the outer cover, defects such as local surface distortion are likely to occur, affecting the surface quality.
(3) The dimensional accuracy is not easy to grasp and rebound is difficult to control. Due to the above reasons, aluminum stamping dies are difficult to develop and require long debugging cycles, which results in high cost and difficulty in meeting the quality requirements of high-grade car body parts.
Hexagon socket set screw, hexagon flat set screw, hexagon cylindrical set screw.
According to the head part: slotted, hexagon socket, square head, etc. Tapered end screws and concave end screws with sharp ends can be used to directly top the parts, and the concave end is more reliable and can bear greater force; Taper end screws without sharp points must be drilled in the parts. The flat end is used to top the tight plane, which does not damage the parts, but bears limited load.
Slotted screws have small tightening force and are often easy to screw off. Generally, they prefer hexagon socket head; The tightening force of square head is the largest, but it can not be embedded in parts, and its use is limited. In order to prevent loosening and withdrawal of threaded parts, a set screw can be drilled at the cross seam. The long cylindrical head screw at the top end is used in the keyway of the shaft to lock and prevent circumferential rotation. It can also be used in general unimportant occasions when the key slides in the keyway of the shaft.