Accurate forming method of special-shape deep-hole type parts

A precision forming, deep hole technology, applied in the field of metal machining, can solve the problems of complex shape, short service cycle, large casting pollution, etc., to achieve the effect of dense internal structure, improved product strength, and prolonged service life

Active Publication Date: 2009-05-06
JIANGSU SUNWAY PRECISION FORGING
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  • Abstract
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AI Technical Summary

Problems solved by technology

Due to the deep inner hole and complex shape of this kind of parts, it cannot be processed by ordinary hot forging method
At present, there are two methods of producing this kind of products: one is casting first and then machining. The disadvantage of this production method is that casting pollution is lar...

Method used

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  • Accurate forming method of special-shape deep-hole type parts
  • Accurate forming method of special-shape deep-hole type parts

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Embodiment Construction

[0015] Taking the processing process of the push rod as an example, the technological process is as follows:

[0016] 1. For sawing, choose a hot-rolled round bar with a diameter of φ48.7 mm, the material grade is 20MnCr5, adjust the cutting length, and control the weight at 610-620 grams;

[0017] 2. Conventional spheroidizing annealing process, put the blank into the annealing furnace, heat it to 770°C±20°C, keep it warm for 4 hours, cool it to 500°C with the furnace, take it out of the furnace, and air cool it to room temperature;

[0018] 3. In the conventional shot blasting process, use 70% sharp sand and 30% steel shots to blast the blank for 20 to 40 minutes to remove oil, rust, burrs, etc. on the surface of the blank;

[0019] 4. Conventional phosphorus saponification process;

[0020] 5. Back-extrusion, cold forging and back-extrusion method is used to complete the pre-forming of deep holes with large deformation at one time, from billet diameter φ48.7mm to outer dia...

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Abstract

The invention provides a precision forming method of special-shaped parts with deep holes, which relates to the metal machining field with almost no cutting, especially a precision cold forging forming technology of special-shaped parts with deep holes. The invention comprises the process of saw-setting, annealing, shot blasting and phosphorus-saponification of part blank, and back extrusion with tremendous deformation of the part blank; thus, the preformed body with deep holes is completed; then the process of low temperature annealing, shot blasting, phosphorus-saponification is repeated; and subsequently by a plurality of cold finishing, the final product which meets the requirements of structure property and dimension precision is obtained. The method has the beneficial effect that by back extrusion, the preformed body is once completed. The metal streamlines inside the product are continuously distributed according to the shape, and the product has compact microstructure and stable quality, thereby prolonging the service life of the product.

Description

Technical field [0001] The invention relates to the field of metal machining without cutting, in particular to a precision cold forging forming technology for special-shaped deep-hole parts. Background technique [0002] Among the cup-shaped parts, there is a type of parts that are deep-hole parts, and the ratio of their hole depth to the minimum inner diameter is greater than 3.5. If the inner hole is a complex special-shaped shape, it is called special-shaped deep-hole parts. Due to the deep inner hole and complex shape of such parts, they cannot be processed by ordinary hot forging methods. At present, there are two methods of producing this kind of products: one is casting first and then machining. The disadvantage of this production method is that casting pollution is large and machining is difficult; the other is powder metallurgy forming. This processing method has the advantages of easy processing, mold The advantages of long life and stable process, the disadvantag...

Claims

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Application Information

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IPC IPC(8): B23P15/00C21D1/32C21D9/00B24C1/10B21C23/20
Inventor 季微微施卫兵徐祥龙
Owner JIANGSU SUNWAY PRECISION FORGING
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