Knowledge of fixing screws for sheet metal stamping parts

For the stamping die used in the processing of self tapping screw stainless steel metal stamping parts, the cost of the die should be calculated before opening the mold, so as to estimate the price of the later metal stamping parts. How to calculate the cost of the metal stamping parts mold? Let's take a look. First, the material cost of the metal stamping parts mold, compared with the following template materials, is one of the commonly used materials, namely, die blade Able to insert better material cr12mo1v1d2dc53 and other metal stamping parts, including punch, insert, other parts, etc. Generally speaking, we estimate the cost by time. Of course, heat treatment can be directly calculated by weight. And the wire cutting processing costs are calculated in square, which can basically budget a more accurate value; and the management fees of the hardware stamping parts factory, which depends on the size of the factory. If a factory with 300 people, it can charge about 15% to 25% of the management fee from the mold cost, if it is a processing shop, then 100% Ten percent is enough; a brief introduction of the bending parts in stamping parts.



Automobile parts processing customized stamping parts processing factory, processing various metal stamping parts, the following is a brief introduction to the knowledge of fixing screws of sheet metal stamping parts; the self tapping screws are used for punching or drawing holes on the plane of sheet metal stamping parts, and the triangular self tapping screws are better for self tapping screws, and the problem of sliding teeth will not occur, but the driving force will be a little heavier than that of non triangular self tapping screws; if the diameter is 3mm For screw locking, the hole diameter D should be between 2.4 ~ 2.5mm; if the diameter is 4mm, the aperture D should be between 3.4 ~ 3.5mm; for punching or drawing holes on the plane of sheet metal stamping parts, when tapping with screws, tapping m3 or M4 mechanical teeth, if locking with 3mm diameter screws, the hole diameter D should be 2.6mm before tapping; if the diameter is 4mm, the hole diameter D should be 3.6mm before tapping The hole diameter D of the riveting fixed nut is based on the manufacturer's recommended size; the connection method of sheet metal stamping parts.



Xiamen hardware parts processing custom factory mechanical parts stamping parts, stamping products need a variety of stamping die processing, metal stamping parts die bending die assembly characteristics? Let's take a look at the metal stamping die. The function of the bending die is to make the blank bend in the plastic deformation range, and obtain the required shape by the permanent deformation of the material after bending. In general, the matching requirements of the guide sleeve and the guide pillar of the bending die can be slightly lower than that of the blanking die, but the surface roughness value of the working part of the punch and the female die is required to be smaller than that of the blanking die, so as to improve the die life and the surface quality of the metal stamping parts. In the bending process, due to the influence of material springback, the shape of bending parts in the mold is often inconsistent with the shape after taking out, which affects the shape and dimensional accuracy of metal stamping parts. There are many factors affecting springback, which are difficult to be eliminated by design and calculation. Therefore, the shape of punch (or female die) is often adjusted according to the springback value of trial die. In order to repair conveniently, the punch and die of bending die are usually heat treated after the die test is qualified. In addition, bending belongs to deformation processing, and the blank size of some bending parts can only be determined through experiments. Therefore, the purpose of the bending die test punching is to find out the defects of the die, to correct and adjust, and to finally determine the blank size of the workpiece. Because this work involves the problem of material deformation, the adjustment of bending die is much more complicated than that of common blanking die. The selection principle of stamping die structure.



With the development of electrical economy, stamping products have developed to various fields, metal stamping parts processing, various types of stamping products, how to choose the press? Let's take a look at it? 1、 Small and medium-sized punching parts, bending parts, stretching parts, forming parts and other stamping parts with low precision requirements generally use "open single column press"; second, medium-sized drawing parts generally use "double acting press"; third, large and medium-sized stamping parts with high precision requirements are mostly using "closed press" or "multi-point press"; fourth, large-scale and large-scale stamping For the production of parts, generally choose "high-speed press" or "multi station press"; fifthly, special "cold extrusion press" should be selected for extrusion process; special "precision stamping press" should be selected for precision stamping process; 7. The "double column or four column press and screw friction machine with good rigidity should be selected for the stamping process of leveling, shaping, correcting and bending In the process of drawing the punch, what is the requirement of the punch press, which can not be used in the stamping process?.



There are 1050 and 5020 aluminum alloy cavity manufacturers in Xiamen. These materials have lines and are easy to break when folded. Cu: (copper) there are bronze, phosphor bronze, brass, red copper (laser cutting is the most difficult). Stamping die design: common stamping material code and name induction, engineers a copy of SUS: 301302304430, etc. 301 has good elasticity, hard, non-magnetic and striation. Generally, the cutting should be rotated 45 degrees to avoid fracture when bending. 304 has poor elasticity, soft, non-magnetic and no ripple. 430 is magnetic.