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Special-shaped curved surface stator precise compound plasticity shaping process and die

A special-shaped curved surface and plastic forming technology, applied in the field of forging, can solve the problems of high production cost, unsatisfactory, poor wear resistance, etc., and achieve the effect of low cost, solving forming problems, and high wear resistance

Active Publication Date: 2008-10-15
CSIC NO 12 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The strength and performance of the stator parts made by direct mechanical processing of raw materials cannot meet the requirements of the automotive power steering pump for stator parts during high-speed movement; Performance requirements, but this method processes the inner cavity surface of the stator parts, long working hours, many procedures, low efficiency, and high production costs; powder metallurgy manufacturing stator parts has the characteristics of energy saving, material saving, high efficiency, and time saving, etc., but the manufacturing The internal structure of the finished stator parts is loose and the wear resistance is poor. The stator parts move at high speed in the automobile power steering pump and are easy to wear

Method used

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  • Special-shaped curved surface stator precise compound plasticity shaping process and die
  • Special-shaped curved surface stator precise compound plasticity shaping process and die
  • Special-shaped curved surface stator precise compound plasticity shaping process and die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Select a bar material with a material of 20CrMnTi and a diameter of Φ65mm, and cut it to obtain an original billet with a length of 26mm. The original billet is heated in a box-type resistance furnace at a heating temperature of 950±10°C and kept for 1 hour; The thermoplastic reverse extrusion mold is preheated, the mold preheating temperature is 200°C, and then the lubricant formed by mixing graphite and gun oil is applied to the working part of the mold to lubricate the mold; the heated billet is placed in the thermoplastic The stator blank is formed by extruding in the reverse extrusion die, and the unilateral machining allowance of the inner cavity surface size of the blank is ≤0.4mm; using the forging waste heat of the blank in a 30KW box-type resistance furnace, the temperature of the stator blank after forging is Under the condition of 730℃~660℃, cooling at a cooling rate of ≤20℃ / h can eliminate residual stress during hot extrusion deformation and reduce material ...

Embodiment 2

[0077]According to the calculation results, select a bar material with a material of GCr15 and a diameter of Φ65mm for blanking to obtain an original billet with a length of 26mm, and place the original billet in a 45KW box-type resistance furnace for heating at a heating temperature of 990±10°C , the holding time is 1 hour; the thermoplastic reverse extrusion mold is preheated, and the mold preheating temperature is 300 ° C, and then the lubricant formed by mixing graphite and gun oil is applied to the working part of the mold to lubricate the mold. The heated billet is extruded in a thermoplastic back-extrusion die to form a stator blank. The unilateral machining allowance of the inner cavity surface size of the blank is ≤0.4mm; the blank is processed in a 30KW box-type resistance furnace by using the forging waste heat Spheroidizing annealing, the annealing temperature is 860±10°C, and the holding time is 3 hours. When the temperature drops to 500°C, it is air-cooled to elim...

Embodiment 3

[0079] According to the calculation results, a bar material with a material of 38CrMoAl and a diameter of Φ65mm was selected for blanking to obtain an original billet with a length of 26mm. The original billet was heated in a 45KW box-type resistance furnace at a heating temperature of 990±10°C , the holding time is 1 hour; the thermoplastic reverse extrusion mold is preheated, and the mold preheating temperature is 400 ° C, and then the mixture of graphite (20%) and gun oil (80%) is painted on the mold; the heated The blank is extruded in a thermoplastic reverse extrusion die to form a stator blank. The machining allowance on one side of the inner cavity surface size of the blank is ≤0.4mm; the blank is quenched and tempered in a 30KW box-type resistance furnace using forging waste heat Treatment, the quenching temperature of this process is 930 ° C ~ 970 ° C, the actual heating temperature is 940 ± 10 ° C, the holding time is 2 hours, after the furnace is air-oil cooled, and ...

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Abstract

The invention discloses a precise compound plastic forming method of a special shaped curved surface stator of a steering pump. The method is carried out with the following steps: blanking, heating the stock to a full-recrystallization temperature plus or minus 10 DEG C and holding; pre-heating a thermoplastic inverted extrusion mould to a temperature of 200 DEG C-400 DEG C, brushing a lubricant on the mould, placing the stock in the thermoplastic inverted extrusion mould to extrude and obtaining the rough with a single-side working allowance of the inner-type cavity curve of less than or equal to 0.4mm; then heat treating, eliminating the residual stress, processing the upper and the lower end surface of the rough until the depth of parallelism thereof is less than or equal to 0.02mm, placing the rough in a cold-trimming mould for trimming at cold state until the single-side working allowance is 0.15mm-0.25mm; processing positioning holes with a position tolerance of less than or equal to Phi 0.02m, hear treating again until the rigidities of surface and core meet the requirement, grinding and obtaining the special shaped curved surface stator of the steering pump. The inventive method is characterized by small forming force, good forming quality, high production efficiency and low cost, and the formed parts have high abrasion resistance and fatigue resistance.

Description

technical field [0001] The invention belongs to the technical field of forging, and relates to a plastic forming method, in particular to a precision composite plastic forming method for a stator with a special-shaped curved surface, and also relates to a mold used for forming the stator in the method. Background technique [0002] The machining of the surface of the cavity in the stator of the automobile power steering pump usually adopts direct machining of raw materials, machining of raw materials after free upsetting, or powder metallurgy. [0003] The strength and performance of the stator parts made by direct mechanical processing of raw materials cannot meet the requirements of the automotive power steering pump for stator parts during high-speed movement; Performance requirements, but this method processes the inner cavity surface of the stator parts, long working hours, many procedures, low efficiency, and high production costs; powder metallurgy manufacturing stato...

Claims

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Application Information

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IPC IPC(8): B23P15/00B21C23/20B21C25/02B21D37/10
Inventor 贺冠雄王超赵恒义徐东
Owner CSIC NO 12 RES INST
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