CN1448233A - Method of cold-heading valve spring seat by five-process puncher - Google Patents
Method of cold-heading valve spring seat by five-process puncher Download PDFInfo
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- CN1448233A CN1448233A CN 02113561 CN02113561A CN1448233A CN 1448233 A CN1448233 A CN 1448233A CN 02113561 CN02113561 CN 02113561 CN 02113561 A CN02113561 A CN 02113561A CN 1448233 A CN1448233 A CN 1448233A
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Abstract
The five-step making process of valve spring seat includes making blank in punch; annealing and phosphorizing; shaping in extruding mold, eliminating burr, crack and angle in lathe and re-phosphorizing; extruding hole in mold with punch; punching hole in punch, annealing and phosphorizing; and extruding to form in extruding mold with lubricating oil with punch. The present invention has reduced deforming resistance, increased mold strength and several times increased mold service life. The present invention may be used in large-scale production.
Description
Technical field
The present invention relates to method of cold-heading valve spring seat by five-process puncher, belong to machinery manufacturing technology field.
Background technology
In decades, China's tradition is made the method for cotter seat, all is to be processed as the master with turning, and as shown in Figure 1, because car goes to step and positions such as endoporus and cut-out will exhaust 70% material, stock utilization only is 30%.Because its profile characteristics are many steps, and have high-precision internal taper hole, the aperture is little, so exist difficulty of processing very big, and shortcoming such as production efficiency is low.Disclosed " cotter seat cold forming " introduced and used the cold headers base about " forging technology " 95 (2) 14-16 in addition, press forming technology processing automobile cotter seat method, because cold headers are to work continuously, workpiece is without annealing, phosphatization is handled, the badly damaged mould of meeting, and the burr that produces in the blanking operation and crackle remain in surface of the work, cause product rejection or reduce product quality, so only be applicable to and produce low-intensity material and the low workpiece of specification requirement, as screw, nuts etc. should not be produced oversize and undersized and complex-shaped part; The cold headers price is high in addition, power consumption is big, is restricted so utilize the cold headers technology to make auto parts machinery.
Summary of the invention
Apply the cold-heading technology, must solve the contradiction of resistance of deformation and mould strength deficiency, the present invention's five operation punch press cold-heading valve spring seat technology have solved above-mentioned contradiction effectively.Its technical scheme is as follows:
The five-process puncher process is as shown in Figure 2:
(1) produce blank with punch press after, to blank anneal, phosphatization;
(2) blank of handling well is placed extrusion die, carry out shaping after, with lathe deburring, crackle and angle, phosphatization again;
(3) cooperate extrusion die to squeeze the hole by punch press;
(4) cooperate the extrusion die punching by punch press, anneal again, phosphatization;
(5) workpiece is inserted in the die cavity of extrusion die, apply oil is lubricated, extrusion molding on punch press.
For solving the indeterminable contradiction of traditional handicraft, five operation cold-heading valve spring seats have been taked 2 effective measures:
One, reduce the workpiece deformation drag:
1. adopt that inside and outside cover is capable of hoisting to be moved, can conveniently control cooling velocity and with the electric furnace annealing of gas shield.
2. adopt strict annealing process curve.
3. the strict charging mode of carrying out.
4. strict control batch, the 100KW electric furnace is no more than 300Kg.
5. sandblast, phosphatization.
6. must be coated with rape oil at surface of the work before being shaped.
7. reduce punch press rotating speed (realizing), reduce to about 25 rev/mins by original 50 rev/mins by changing the motor driving wheel.
Two, improve mould strength:
1. select the new die material of just having developed in recent years for use, as LD, 65Ni, 18Ni etc.The Cr12MoV that adopted with former tradition compares, and obviously advantage such as high abrasion, high strength, high tenacity, high impact-resistance, high-fatigue strength is arranged.
2. Yan Ge mold materials heat treatment (is example with LD).
1. preheating is 750 ℃.2. 1050 ℃ of-1150 ℃ of heating quenchings (oil).3. 500 ℃ of left and right sides tempering are 2 hours * 3 times.4. surfaces nitrided (500 ℃ are not less than 30 hours).Have ready conditions and to do ionic nitriding.
Through above-mentioned processing, matrix hardness reaches HRC58-60, and case hardness reaches more than the HRC65.The preferred 65Ni of drift material (good toughness, heat treatment and LD are close).If under the special condition of severe of condition of work, the drift material can be selected 18Ni (it combines with intensity higher) for use.
By adopting the organic combination of said method, solved the principal contradiction of the big and mould strength deficiency of drag in the cold-heading distortion well, make and improve several times (improving 2～5 times) in service life of mould than Cr12MoV, thereby make the technological direction maturation of five operation punch press cold-heading valve spring seats, and be applied to the large-scale production practice.
Compare with conventional method, the present invention has following major advantage:
1. material saving, because be no iron filings processing, stock utilization can reach 95%, than traditional handicraft material-saving more than 50%.
2. the production efficiency height because once-forming has saved car, milled, digs, grinds multiple working procedure, generally improves 5～10 times than traditional handicraft.
3. the whole operations of the present invention are all used mould, thereby make the quality of production reliable and stable.
4. be fit to the unmanageable part of processing traditional handicraft.Especially the little endoporus effect of cold-heading is obvious, is better than traditional handicraft.
5. be fit to large-scale production, production scale is big more, and economic benefit is obvious more, and is big more than the advantage of traditional handicraft.
6. production cost reduces significantly, has greatly strengthened the competitiveness of product in market.
7. part is through repeatedly pushing the cold-heading distortion, and its comprehensive strength increases substantially, and makes low-intensity material can replace high-strength material to use, thereby has improved the economic worth of material.
8. can produce serial cotter seat and multiple auto parts machinery.
9. this technology breaks through the cold heading technique forbidden zone.---" the unsuitable cold-heading cold extrusion of internal taper hole " (relevant report and the books of all relevant cold extrusions, cold-heading are all listed internal taper hole cold-heading cold extrusion in the technology forbidden zone).
Description of drawings
Fig. 1 is the schematic diagram of conventional method processed springs seat.
Fig. 2 is a process chart of the present invention.
Fig. 3 is the annealing furnace structure schematic diagram.
Fig. 4 is an annealing process curve.
The specific embodiment
The invention will be further described below in conjunction with drawings and embodiments:
With the little car spring seat in processing Chang'an is example, and the specific embodiment is as follows:
1, changes the diameter of motor driving wheel, the speed of punch press is adjusted into 20-25 time/minute;
2, the choosing and handling of mold materials: mould adopts 65 niobiums (Ni) matrix steel, through 1050-1150 ℃ of quench hot, makes hardness reach HRC58-60; Behind 500-600 ℃ of tempering and 500-550 ℃ of nitrogen treatment, make shearing die, extrusion die, die and drift again.
3, technological process of the present invention as shown in Figure 2.
At first, choose the round steel that diameter is 18mm, produce blank with shearing die; Then, to the blank of shearing anneal, phosphatization; Its annealing is used special-purpose annealing furnace as shown in Figure 3, and special-purpose annealing furnace comprises outer cover 1, resistance wire 2, inner cover 3, piece installing dish 4, lifting hanging piece hook 5, protection gas jets 6 and base 7.Workpiece is evenly placed in the piece installing dish 4 of the high about 70mm of dish 100KW electric furnace dress 300Kg.Piece installing dish 4 neatly is stacked in by stent support on the base 7 of annealing furnace, inner cover 3 and outer cover 1 on the cover, and from the protection gas jets 6 feeding protective gas of annealing furnace bottom, outage is incubated 4 hours when being heated to 930 ± 10 ℃; Be cooled to 730 ± 10 ℃, be incubated 4 hours; Outage naturally cools to about 200 ℃ comes out of the stove.Fig. 4 is annealing process curve figure.Workpiece after the annealing through pickling, cleaning, is put into bonderite and is heated to 80-90 ℃ and boils about 20 minutes after oxide is removed in sandblast, takes out and cleans, and puts into 50 ℃ De Suds Ye Sudsization and takes out about 15 minutes, dries, and blank is carried out shaping, crowded hole.According to the outer shape of part, cooperate punch press to carry out shaping by mould, remove phosphatization after surperficial burr, crackle, the chamfering with the dolly bed; Again with punch press and cooperate mould to squeeze the hole; Anneal again, phosphatization, this time annealing temperature is 860 ℃ and keeps after 5 hours, outage is come out of the stove after being chilled to 200 ℃ again; Workpiece is carried out punching; Workpiece is inserted in the die cavity of extrusion die at last, it is lubricated to add rape oil, extrusion molding on punch press.
This method can be shaped to the part processing of multiple shape.
Claims (3)
1, method of cold-heading valve spring seat by five-process puncher mainly comprises:
(1) five-process puncher:
(1) produce blank with shearing die after, to blank anneal, phosphatization;
(2) blank of handling well is placed extrusion die, carry out shaping after, with lathe deburring, crackle and chamfering, phosphatization again;
(3) cooperate extrusion die to squeeze the hole by punch press;
(4) cooperate the extrusion die punching by punch press, anneal again, phosphatization;
(5) workpiece is inserted in the die cavity of extrusion die, apply oil is lubricated, extrusion molding on punch press;
(2) reduce the workpiece deformation drag:
(1) adopts that inside and outside cover is capable of hoisting to be moved, can conveniently control cooling velocity and with the annealing furnace of gas shield;
(2) adopt strict annealing process curve;
(3) the strict charging mode of carrying out;
(4) strict control batch, the 100KW electric furnace is no more than 400Kg;
(5) sandblast, phosphatization;
(6) must be coated with rape oil at surface of the work before the shaping;
(7) reduce punch press rotating speed (realizing), reduce to about 25 rev/mins by original 50 rev/mins by changing the motor driving wheel;
(3) improve mould strength:
(1) selects in recent years the new die material of development just for use, as LD, 65Ni, 18Ni etc.;
(2) Yan Ge mold materials heat treatment:
1. preheating is 750 ℃; 2. 1050 ℃ of-1150 ℃ of heating quenchings (oil); 3. 500 ℃ of left and right sides tempering are 2 hours * 3 times; 4. surfaces nitrided (500 ℃ are not less than 30 hours);
2, method of cold-heading valve spring seat as claimed in claim 1 is characterized in that: described annealing process curve comprises that being heated to 930 ± 10 ℃ is incubated 3-4 hour, is cooled to 730 ± 10 ℃ of insulations 3-4 hour, naturally cools to 200 ± 5 ℃.
3, method of cold-heading valve spring seat as claimed in claim is characterized in that: described annealing furnace comprises outer cover, inner cover, piece installing dish, lifting hanging piece hook and base, establishes resistance wire on the outer cover; Establish the protection gas jets on the base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02113561 CN1448233A (en) | 2002-04-03 | 2002-04-03 | Method of cold-heading valve spring seat by five-process puncher |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02113561 CN1448233A (en) | 2002-04-03 | 2002-04-03 | Method of cold-heading valve spring seat by five-process puncher |
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| CN1448233A true CN1448233A (en) | 2003-10-15 |
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| CN 02113561 Pending CN1448233A (en) | 2002-04-03 | 2002-04-03 | Method of cold-heading valve spring seat by five-process puncher |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357627A (en) * | 2011-10-12 | 2012-02-22 | 章升谊 | Method for machining valve spring retainer by continuous cold heading once near net shape forming |
| CN102357640A (en) * | 2011-10-12 | 2012-02-22 | 章升谊 | Continuous cold heading once near-net-shape forming die assembly of valve spring seat |
| CN102554028A (en) * | 2011-12-31 | 2012-07-11 | 苏州三维精密机械有限公司 | Hole edge chamfering processing technology |
| CN102861860A (en) * | 2012-08-30 | 2013-01-09 | 镇江中虎弹簧有限公司 | Cold upsetting manufacturing process for valve seat |
| WO2014048092A1 (en) * | 2012-09-28 | 2014-04-03 | 机械科学研究总院先进制造技术研究中心 | Manufacturing method and device for automobile spring seat |
| CN111822647A (en) * | 2020-06-05 | 2020-10-27 | 宁波甬微集团有限公司 | Manufacturing method of rolling piston for refrigeration compressor |
-
2002
- 2002-04-03 CN CN 02113561 patent/CN1448233A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102357627A (en) * | 2011-10-12 | 2012-02-22 | 章升谊 | Method for machining valve spring retainer by continuous cold heading once near net shape forming |
| CN102357640A (en) * | 2011-10-12 | 2012-02-22 | 章升谊 | Continuous cold heading once near-net-shape forming die assembly of valve spring seat |
| CN102554028A (en) * | 2011-12-31 | 2012-07-11 | 苏州三维精密机械有限公司 | Hole edge chamfering processing technology |
| CN102861860A (en) * | 2012-08-30 | 2013-01-09 | 镇江中虎弹簧有限公司 | Cold upsetting manufacturing process for valve seat |
| WO2014048092A1 (en) * | 2012-09-28 | 2014-04-03 | 机械科学研究总院先进制造技术研究中心 | Manufacturing method and device for automobile spring seat |
| CN111822647A (en) * | 2020-06-05 | 2020-10-27 | 宁波甬微集团有限公司 | Manufacturing method of rolling piston for refrigeration compressor |
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