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Automobile structural parts refer to the bearing parts or load-bearing parts in the automobile, which are closely related to automobile safety. In the automobile body, many structural parts are installed on the nodes of the body structure and connected with other structural parts to form a deformation resistant high-strength frame. Due to the complex structure and high precision requirements of these parts, they are usually produced by multi station progressive die. Although the progressive die for automobile structural parts has many advantages, such as high production efficiency, saving material cost, good product accuracy and so on, the combination of the…

Recently, I saw some social friends asking about the processing method of holes. I saw that this information is better. I can share it with you for common progress. Cylindrical hole machining with different precision and different blank: Example: hole Φ 25 (0, +0.033), tolerance H8, fried dough twist to hole. Φ 24.8 ream to Φ 25 (0, + 0.033) holes Φ 35 (0, +0.062), hole tolerance H7, fried dough twist drill. Φ 34.8, ream to Φ 35（0，+0.062） Φ 8 (0, +0.018), hole tolerance is about H7-H8, center drill positioning, fried dough twist to Φ 6. Rough boring to Φ…

Since the first ruby laser was developed by American scientist Meiman in 1960, with the needs of the world's scientific and economic development, the laser technology has developed rapidly, especially in recent decades, which has greatly promoted the wider application of laser processing technology. Compared with ordinary light, laser has four characteristics, namely monochromaticity (single wavelength), coherence, directivity and high light intensity. The laser beam is easy to transmit, and its temporal and spatial characteristics can be controlled respectively. After focusing, a very small spot can be obtained. The laser beam with very high power density can melt and gasify…

Tolerance is one of the important factors affecting product quality and price. When manufacturing parts, experience tells us that no matter how much cost and time are invested, it is almost impossible to accurately process them according to the dimensions marked on the drawing. Product design should meet the needs of users in terms of performance and economy. From the enterprise itself, it must also maintain normal profits. Therefore, the tolerance must be determined by the performance and economy of the product. Therefore, the design should fully grasp the principle of tolerance.  (1) dimensional tolerance of punching parts. (2) side…

1. Hole flanging There are many types of hole flanging. This criterion only focuses on the inner hole flanging of the thread to be processed, as shown in the figure. (the diameter and flanging height of the bottom hole and flanging hole of uterine screw are commonly used in sheet metal parts) 2. Through holes and countersunk seats for screws and bolts The structural dimensions of screw, bolt through hole and countersunk seat are selected in the following table. For the countersunk seat of countersunk screw, if the plate is too thin to ensure through hole D2 and countersunk hole…

1. In order to improve the strength of long sheet metal parts, reinforcement bars should be designed. 2. Bending at the corner of the bending part can strengthen the rib. 3. Stiffener Pressing ribs on plate-shaped metal parts helps to increase the structural rigidity. See the table for the structure and size selection of stiffeners. 4. Limit dimensions of convex spacing and convex edge spacing The limit dimensions of convex spacing and convex edge spacing are selected in the following table.

Configuration criterion of deep drawing parts a. The shape of drawing parts shall be as simple and symmetrical as possible. b. The size proportion of each part of the drawing part shall be appropriate, and the drawing parts with wide flange and large depth shall be avoided as far as possible. (d convex > 3D, H ≥ 2D) because such parts need more drawing times. c. The fillet radius of deep drawing parts shall be appropriate, and the fillet radius shall be larger as far as possible, so as to facilitate forming and reduce the number of deep drawing.  (1)…

1. Minimum bending radius of plate When the material is bent, on the fillet area, the outer layer is stretched and the inner layer is compressed. When the material thickness is constant, the smaller the inner radius R is, the more serious the tension and compression of the material are; When the tensile stress of the outer fillet exceeds the ultimate strength of the material, cracks and fractures will occur. Therefore, too small bending fillet radius should be avoided in the structural design of bending parts. The minimum bending radius is specified for this purpose. L bending radius refers to…

When designing product parts, the problem of easy manufacture must be considered. Try to think of some methods, which can not only make processing easy, but also save materials, increase strength and avoid waste products. Therefore, designers should pay attention to the following manufacturing matters. The manufacturability of sheet metal parts refers to the difficulty of parts in punching, bending and stretching. Good technology should ensure less material consumption, less number of processes, simple die structure, high service life and stable product quality. In general, the biggest impact on the manufacturability of sheet metal parts is the performance of materials,…

Opening Preface: Sheet metal (metal plate;; sheetmetal), a processing technology, has not yet had a relatively complete definition of sheet metal. According to a definition in a foreign professional journal, it can be defined as: sheet metal is a comprehensive cold working process for sheet metal (usually less than 6mm), including shearing, punching / cutting / compounding, folding, riveting, splicing, forming (such as automobile body), etc. Its remarkable feature is that the thickness of the same part is the same. Sheet metal has the characteristics of light weight, high strength, conductivity (which can be used for electromagnetic shielding), low cost…