CN102896166A - Engine piston pin cold finishing-drawing process - Google Patents
Engine piston pin cold finishing-drawing process Download PDFInfo
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- CN102896166A CN102896166A CN2012103132376A CN201210313237A CN102896166A CN 102896166 A CN102896166 A CN 102896166A CN 2012103132376 A CN2012103132376 A CN 2012103132376A CN 201210313237 A CN201210313237 A CN 201210313237A CN 102896166 A CN102896166 A CN 102896166A
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- pulled out
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Abstract
The invention relates to an engine piston pin cold finishing-drawing process which comprises the steps that: (a) annealing is carried out, wherein a well-type vacuum annealing furnace is subjected to vacuum pumping; nitrogen is filled and annealing is carried out under the protection of nitrogen; a decarburization unilateral depth after annealing is no higher than 0.1mm, and a material hardness after annealing is HB113-120; (b) cold finishing-drawing is carried out, wherein a hole diameter error is no higher than 0.1mm, an outer circle error is no higher than 0.05mm, a surface roughness is 1.6, and a drawing length is 6m; (c) blanking is carried out; and (d) end face flattening is carried out. The process provided by the invention has the advantages that: compared with a traditional piston pin processing process, with the process provided by the invention, production efficiency is improved, cost is reduced, and product quality stability and reliability are improved.
Description
Technical field
This invention relates to a kind of processing technology of piston pin, and particularly the cold essence of a kind of engine gudgeon pin is pulled out technique, belongs to the engine manufacturing technology field.
Background technology
The kind of piston pin in the market is a lot, be widely used on automobile engine, but piston pin all is to adopt traditional cold-extruded processing basically.Traditional processing method efficient low, equipment investment is excessive and the defective such as unstable product quality.Piston pin is a kind of load carrier, and very high requirement of strength is arranged, and simultaneously the metallographic of product is required high (grain size number is 6 grades), the piston pin that conventional method is made, and price is high, and the delivery cycle is long.
Traditional process route: blanking → turning, end face → annealing → epithelium → to squeezing deep hole → punching
This mode of production inefficiency, per tour only can be produced about 2000 of blanks, the investment of equipment, cutter is excessive (to need 5 meters of press 100W RMB altogether, 10 40W RMB of lathe), in addition waste of raw materials serious (about single blank waste 0.05Kg), and because the defective (the incorgruous stretching of metallic fiber etc.) of squeezing deep hole itself can't be remedied by follow-up processing, bring hidden danger to product quality.
Summary of the invention
Goal of the invention: the purpose of this invention is to provide that a kind of production efficiency is high, the cold essence of the reliable engine gudgeon pin of steady quality is pulled out technique.
Technical scheme: the cold essence of a kind of engine gudgeon pin is pulled out technique, and described cold essence is pulled out technique and be may further comprise the steps:
A) annealing: adopt pit type annealing furnace to vacuumize and inflated with nitrogen protection annealing, the monolateral degree of depth of annealing rear oxidation decarburization is less than or equal to 0.1 millimeter, and material hardness is HB113-120 after the annealing;
B) cold essence is pulled out: the bore dia error is less than or equal to 0.1 millimeter, and outer circular error is less than or equal to 0.05 millimeter, and surface roughness 1.6, drawing length are 6 meters;
C) blanking;
D) planar end surface.
Beneficial effect: the present invention compares with traditional piston pin processing technology and has improved production efficiency, has reduced cost, has improved stability and the reliability of product quality.
The specific embodiment
The invention will be further described below in conjunction with embodiment.
Invent described process route: annealing → cold essence is pulled out → Full-automatic blanking → automatic planar end surface
The production efficiency of this mode of production is greatly improved, per tour can be produced about 20000 of blanks, equipment, frock investment lower (only needing 30WRMB of drawbench, 2 10WRMB of automatic lathe and auxiliary facility that some are auxiliary to amount to 50WRMB), single blank can save material about 0.1Kg in addition, and because deep hole is through unidirectional drawing moulding, avoid the defective of the incorgruous stretching of metallic fiber, guaranteed output and quality.
Annealing: adopt pit type annealing furnace to vacuumize and inflated with nitrogen protection annealing, the decarburization of annealing rear oxidation is monolateral≤and 0.1 millimeter, material hardness HB113-120 after the annealing.
Require: 1, firing rate＜150 ℃/h, cooling rate＜50 ℃/h;
2, forvacuum exhausts at every turn and is filled with nitrogen, its pressure 〉=0.01Mpa;
3, the annealing metallographic structure is the F+P ball, and rank is the 4-6 level
Cold essence is pulled out: adopt the drawbench of 1000KN to carry out drawing, and extruding force P=20T, in the bore dia error 0.1, in the outer circular error 0.05, workpiece surface roughness 1.6,6 meters of drawing length.
Facts have proved the technical characteristics of the blank of piston pin after extruding:
1, grain size is better than 6 grades
2, mechanical property: σ b 〉=1300MPa σ s 〉=900MPa
3, mechanical endurance: 〉=200 ten thousand times
In sum: through piston pin quality, dependable performance that cold forging is produced, production efficiency significantly improves, and cost obviously descends, and can satisfy client's demand.
Claims (1)
1. the cold essence of engine gudgeon pin is pulled out technique, it is characterized in that: described cold essence is pulled out technique and be may further comprise the steps:
A) annealing: adopt pit type annealing furnace to vacuumize and inflated with nitrogen protection annealing, the monolateral degree of depth of annealing rear oxidation decarburization is less than or equal to 0.1 millimeter, and material hardness is HB113-120 after the annealing;
B) cold essence is pulled out: the bore dia error is less than or equal to 0.1 millimeter, and outer circular error is less than or equal to 0.05 millimeter, and surface roughness 1.6, drawing length are 6 meters;
C) blanking;
D) planar end surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103132376A CN102896166A (en) | 2012-08-30 | 2012-08-30 | Engine piston pin cold finishing-drawing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103132376A CN102896166A (en) | 2012-08-30 | 2012-08-30 | Engine piston pin cold finishing-drawing process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102896166A true CN102896166A (en) | 2013-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012103132376A Pending CN102896166A (en) | 2012-08-30 | 2012-08-30 | Engine piston pin cold finishing-drawing process |
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| CN (1) | CN102896166A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03142030A (en) * | 1989-10-26 | 1991-06-17 | Atsugi Unisia Corp | Forming method for piston pin |
| CN2268784Y (en) * | 1995-08-11 | 1997-11-26 | 常熟市第二异型钢管厂 | Special pipe for piston pin |
| CN101289925A (en) * | 2007-04-18 | 2008-10-22 | 扬州龙川钢管有限公司 | Heat insulated tubing machining process |
| CN102005870A (en) * | 2010-12-16 | 2011-04-06 | 镇江中虎弹簧有限公司 | Rotor manufacture process |
| CN102517491A (en) * | 2011-12-24 | 2012-06-27 | 徐州徐工液压件有限公司 | Cylinder barrel of oil cylinder of crane and processing process thereof |
-
2012
- 2012-08-30 CN CN2012103132376A patent/CN102896166A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03142030A (en) * | 1989-10-26 | 1991-06-17 | Atsugi Unisia Corp | Forming method for piston pin |
| CN2268784Y (en) * | 1995-08-11 | 1997-11-26 | 常熟市第二异型钢管厂 | Special pipe for piston pin |
| CN101289925A (en) * | 2007-04-18 | 2008-10-22 | 扬州龙川钢管有限公司 | Heat insulated tubing machining process |
| CN102005870A (en) * | 2010-12-16 | 2011-04-06 | 镇江中虎弹簧有限公司 | Rotor manufacture process |
| CN102517491A (en) * | 2011-12-24 | 2012-06-27 | 徐州徐工液压件有限公司 | Cylinder barrel of oil cylinder of crane and processing process thereof |
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Application publication date: 20130130 |