A cold processing technology of ultra-deep hole slender parts and cold extrusion elongation die

Abstract

The invention discloses a cold processing technology of an ultra-deep hole slender part and a cold extrusion elongation die, belonging to the technical field of cold extrusion processing. In the cold working process of the present invention, the surface phosphating treatment is first carried out on the bar according to the needs of the parts to form a hollow short tube blank; The hollow short tube blank is cold extruded and stretched to the required length of the part, and the ultra-deep hole of the slender part is formed. The invention also discloses a cold extruding elongating die for the cold working process of the ultra-deep hole slender parts. The invention solves the problems of the existing ultra-deep hole slender parts such as high difficulty in forming, poor precision, and low processing efficiency, greatly improves the processing efficiency and processing quality of the ultra-deep hole slender parts, and has strong processing adaptability to the parts. It can be used for cold forming of various ultra-deep hole slender parts, theoretically not limited by the length-to-diameter ratio of the part, especially suitable for processing ultra-deep hole parts with a large length-to-diameter ratio.

Description

technical field [0001] The invention relates to a cold working process and a cold heading die, more specifically, to a cold working process and a cold extrusion elongating die for ultra-deep hole slender parts. Background technique [0002] Slender parts with holes are a common type of parts in industry, such as figure 1 The hollow hanger screws used in the show bike stem and Figure 4 Hollow piston rods in electric bicycle shock absorbers, etc. Generally, a hole whose depth exceeds 5 times the diameter of the hole is called a deep hole, and the ratio of the depth of the hole to the diameter of the hole is called the "length-to-diameter ratio" or "depth-to-diameter ratio". Relatively speaking, a cylindrical hole with a length-to-diameter ratio of no more than 5 times can be called a "shallow hole", and it is relatively convenient to process and form; while for a deep hole, it is generally processed by boring or drilling, and for the hole depth and It is very difficult to ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of existing ultra-deep hole slender parts such as the difficulty of cold heading and low efficiency, and provide a cold processing process and cold extrusion elongation die for ultra-deep hole slender parts. The technical solution is to first carry out surface phosphating treatment on the bar according to the needs of the parts to form a hollow short tube blank, and then use the grommet to extend into the central through hole of the hollow short tube blank, and under the protection of the grommet, the hollow short tube The tube blank is cold extruded and elongated to the required length of the part to form the ultra-deep hole of the slender part, which solves the problems of the existing ultra-deep hole slender parts such as difficulty in forming, poor quality, and low processing efficiency, and greatly improves the ultra-deep hole. The processing efficiency and processing quality of deep-hole slender parts, and the processing adaptability to parts, can be used for cold forming of various ultra-deep-hole slender parts. Theoretically, it is not limited by the length-diameter ratio of parts, especially suitable for large Machining of Ultra-deep Hole Parts with Length-diameter Ratio

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