Blog

1. Questions raised In processing the main part of a military product - fixed plate (material 45 steel, overall dimension 1005) × seven thousand × A total of 1071 pieces need to be drilled at 20mm) φ 24mm 30 ° inclined hole, and the surface roughness of the hole wall is required to reach RA6 three μ m。 When drilling, the thickness of the workpiece is greater than the nominal size by 3mm (reserved as finish planing allowance). When the standard fried dough twist drill is used to drill the fixed plate on the z3550 universal radial drilling machine, the…

01 laser welding Laser welding: the surface to be processed is heated by laser radiation, and the surface heat is diffused internally through heat transfer. The workpiece is melted to form a specific molten pool by controlling the laser parameters such as laser pulse width, energy, peak power and repetition frequency. Laser welding can be realized by continuous or pulsed laser beam. The principle of laser welding can be divided into heat conduction welding and laser deep penetration welding. When the power density is less than 10 ~ 10 W / cm, it is heat conduction welding. At this time,…

Machining error refers to the degree of deviation between the actual geometric parameters (geometric dimension, geometric shape and mutual position) and the ideal geometric parameters. After machining, the degree of conformity between the actual geometric parameters and the ideal geometric parameters is the machining accuracy. The smaller the machining error is, the higher the degree of conformity is, and the higher the machining accuracy is. Machining accuracy and machining error are two formulations of a problem. Therefore, the size of machining error reflects the machining accuracy. 1、 Manufacturing error of machine tool The manufacturing errors of machine tools mainly include…

1. Processing characteristics of shoulder nut The shoulder stainless steel nut blank is shown in Figure 1. This kind of part has large processing quantity, small volume and short processing time. The operator needs to clamp repeatedly when processing on the ordinary horizontal lathe, resulting in the increase of auxiliary time, labor intensity and low processing efficiency. In order to reduce the machining efficiency and improve the machining process. Figure 1 2. Process improvement The process of processing the shoulder nut with an ordinary horizontal lathe is as follows: ① material preparation and quenching and tempering. ② Turning end face,…

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.