Production method and die of cold-drawing transmission shaft
A transmission shaft and mold technology, applied in metal drawing forming tools, manufacturing tools, metal wire drawing, etc., can solve the problem of inability to produce transmission shaft tolerance, precision cold-drawn section steel, cold-drawn round steel tolerance and high precision, size Problems such as inability to be precisely controlled to achieve the effects of excellent comprehensive mechanical properties, saving raw material resources, and stable dimensions
Inactive Publication Date: 2010-04-14
HENGYANG KANGYI METAL PRODS +1
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Problems solved by technology
[0002] The traditional transmission shaft processing adopts mechanical cutting, which consumes a lot of man-hours, low material utilization rate and high cost; while the cold drawn steel (GB905-1994) produced by the traditional cold drawing process cannot produce products that can meet the tolerance of the transmission shaft, Cold-drawn steel with precision and other requirements
The cold-drawn round steel produced by the traditional cold-drawing process has the highest tolerance and precision and can only produce h8 grade products, and the tolerance is mostly above 0-0.03mm, which cannot meet the requirements of assembly bearings
The main technical difficulty is that the size during cold drawing cannot be precisely controlled
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[0031] A method for producing a transmission shaft by a cold drawing process, the specific production method is as follows:
[0032] A. Inspection and classification of billets: Classify billets according to their hardness and divide them into 5 interval categories, namely HB≤170, HB170~200, HB200~230, HB230~250, and HB250 and above.
[0033] B. Pretreatment before drawing, the pretreatment before drawing includes:
[0034] 1. Pickling treatment: Soak the blank with 10-15% sulfuric acid at a temperature of 70-80°C for 25-30 minutes.
[0035] 2. Neutralization treatment: Soak the billet after pickling treatment in 5% N a In OH aqueous solution, the soaking temperature is 40°C, the soaking time is 10 minutes, and then rinsed with clean water.
[0036] 3. Phosphating treatment: Soak the neutralized billet in phosphating solution at 70-80°C for 10-15 minutes.
[0037] The phosphating solution is composed of the following raw materials, the parts are parts by weight, wherein: zi...
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Abstract
The invention discloses a method for producing a transmission shaft by adopting a cold-drawing process, comprising the following steps of: A. detection, classification and grading of blanks, classifying the blanks into the following 5 section categories based on hardness: the Brinell Hardness (HB) less than or equal to 170, the HB between 170 and 200, the HB between 200 and 230, the HB between 230 and 250 and the HB larger than 250; B. pre-treatment before the drawing, the pre-treatmetnt comprises acid cleaning treatment, neutralizing treatment, phosphating treatment and soaping treatment of molybdenum disulfide; C. drawing treatment: pointing, drawing, strengthening and detecting the blanks, then packing and putting in the storage. The invention also provides a die for producing the transmission shaft by adopting the cold-drawing and the die comprises an A type wiredrawing hard alloy die and a C type drawing hard alloy die. The invention improves a lead-in conicity and a lead-out conicity of the die as well as the size of a die cavity diameter fixing strip and increases the lead-in cone and extends the diameter fixing strip of the die, thereby reducing the contact area between the blanks and the die when being lead in and increasing the stability of the blanks in the die cavity when being drawn.
Description
technical field [0001] The invention relates to a metal rolling processing method, in particular to a method for producing a transmission shaft by adopting a cold drawing process and a mold for producing a transmission shaft by adopting the cold drawing process. Background technique [0002] The traditional transmission shaft processing adopts mechanical cutting, which consumes a lot of man-hours, low material utilization rate, and high cost; while the cold-drawn steel (GB905-1994) produced by the traditional cold-drawing process cannot produce products that can meet the tolerances of the transmission shaft, Cold-drawn steel with precision and other requirements. The cold-drawn round steel produced by the traditional cold-drawing process has the highest tolerance and precision and can only produce h8 grade products, and the tolerance is mostly above 0-0.03mm, which cannot meet the requirements of assembly bearings. The main technical difficulty is that the size during cold ...
Claims
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IPC IPC(8): B21C1/00B21C3/00
Inventor 刘洪伟尹旭日
Owner HENGYANG KANGYI METAL PRODS
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