Large size roller cold-upsetting and press-forming method, and cold-upsetting and press-forming mold

Abstract

The invention relates to a large-dimension roller cold heading punching method and a cold heading punching die. The large-dimension roller cold heading punching method comprises the steps as follows: bar stock is cut as roller material sections by a bar stock cutting die; the roller material sections are punched as roller blanks by the cold heading punching die. The bar stock cutting die is provided with a material feeding wheel, a knife edge die, a cutter and a material baffle; the bar stock is movably connected with the material feeding wheel and the knife edge die; the cutter is arranged at one end of the knife edge die; the material baffle is arranged at one side of the cutter. The cold heading punching die of the invention is provided with a push-off pin, a punching die and a formed punch; the roller material sections and the push-off pin are matched with the punching die; the formed punch is matched with the roller material blanks; the formed punch is connected with a power mechanism. The bar stock of the invention adopts high-carbon chromium bearing steel and the diameter of the roller blank is ranging from 23mm to 28mm. The roller blank processed by the invention can achieve the soft grinding level of turning, the chamfer is naturally formed, the high-strength, high rotation speed and long service life of the finished bearing are ensured, the geometrical dimension and the precision of the roller are ensured, thus realizing the low vibration and silencing of the bearing and reducing the initial manufacture cost at the same time.

Description

Technical field: [0001] The invention relates to a cold heading stamping method and a cold heading stamping die for forming and processing relatively large short cylindrical roller bearing rollers. Background technique: [0002] A bearing is a component used in a rotating mechanism to support, reduce friction and bear loads. The roller is a group of essential parts inside the bearing. This process is specially designed for large-size bearings. Due to the small cross-section, high load-carrying capacity and small deformation of the roller bearing, it is suitable for high load, high-speed operation, low vibration and In quiet occasions, at the same time, the product has a large radial bearing capacity, and the rollers are in linear contact with the raceway, which is suitable for bearing impact loads and has a long service life. At the same time, roller bearings are widely used in various high-end fields due to their compact dimensions, high strength, strong carrying capacity,...

AI Technical Summary

Problems solved by technology

[0003] 1. At present, the rollers assembled in the finished bearings are easy to turn as the primary processing, but the internal structure of the material is not changed, and it is difficult to achieve a uniform metallographic structure. The heat treatment hardenability is poor, which makes the mechanical properties of the rollers poor, and the strength itself is obvious. Not enough, not enough to guarantee the bearing capacity and fatigue resistance of the finished bearing, and it is difficult to meet the service strength and rated load capacity required by the current high-end field

[0004] 2. At present, the rollers that use the lathe processing technology are not conducive to the processing and positioning of the workpiece due to the low precision of the lathe itself, and the error caused by the dimensional tolerance is difficult to eliminate, and the roughness is also low, so the processing accuracy of the final roller cannot be guaranteed. It cannot guarantee the assembly accuracy and rotation accuracy of the finished bearing

[0005] 3. At present, the rollers manufactured by the lathe processing process, due to many processing procedures, require a lot of manpower and equipment, so the material cost, process cost and man-machine cost are too high, and it is difficult to achieve economic benefits.

[0007] 1. In the process of high-speed cold heading stamping in the traditional stamping die structure, each part of the inner surface of the die 2' is subject to high pressure and strong friction and wear, so the inner surface is prone to axial cracks, and the chamfered part is also prone to cracks and peeling , the push rod 1' is also easy to break, so the surface of the processed roller is also accompanied by cracks, scratches, folds and burrs in varying degrees, resulting in: ① serious defects appear on the surface of the roller, and the mechanical properties are reduced; ② the metal The internal metallographic structure is also not very uniform; ③ heat treatment hardenability is poor

The above points affect the strength of the roller itself, which is not enough to guarantee the bearing capacity and fatigue resistance of the finished bearing, and it is difficult to meet the service strength and rated bearing capacity required by the current high-end field

[0008] 2. The traditional stamping die structure adopts an integral structure, so the size, deviation, shape and position tolerance, roughness, heat treatment hardness and hardenability inside the die are difficult to improve the life of the die, so in the cooling of the roller In the process of upsetting and stamping, the errors caused by the mold structure and dimensional tolerances are difficult to eliminate, and the roughness is also low. The size dispersion of each batch is relatively large, which cannot guarantee the subsequent finishing of the rollers, and the assembly accuracy of the finished bearings cannot be guaranteed. and rotational accuracy

[0009] 3. The traditional stamping die structure, because it adopts an integral structure, has a relatively low service life, and every time the specification is changed, the entire die must be redesigned and manufactured, which is not easy to achieve serialization and cannot meet the requirements for interchangeability. Therefore, it causes unnecessary consumption of raw materials and mold manufacturing process, resulting in high material cost, process cost and labor and machine cost, and it is difficult to improve economic benefits.

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