CN103084797A - Method for forging bolt for caterpillar track of excavator - Google Patents
Method for forging bolt for caterpillar track of excavator Download PDFInfo
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- CN103084797A CN103084797A CN2012105116715A CN201210511671A CN103084797A CN 103084797 A CN103084797 A CN 103084797A CN 2012105116715 A CN2012105116715 A CN 2012105116715A CN 201210511671 A CN201210511671 A CN 201210511671A CN 103084797 A CN103084797 A CN 103084797A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005242 forging Methods 0.000 title claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 4
- 238000010791 quenching Methods 0.000 claims description 15
- 230000000171 quenching effect Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 238000005496 tempering Methods 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 5
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 238000005201 scrubbing Methods 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 235000010288 sodium nitrite Nutrition 0.000 claims description 3
- 239000002904 solvent Substances 0.000 claims description 3
- 230000002269 spontaneous effect Effects 0.000 claims description 3
- 238000010792 warming Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000000641 cold extrusion Methods 0.000 abstract description 2
- 230000003111 delayed effect Effects 0.000 abstract description 2
- 239000004615 ingredient Substances 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 229910052718 tin Inorganic materials 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 210000000981 epithelium Anatomy 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Forging (AREA)
Abstract
The invention discloses a method for forging a bolt for a caterpillar track of an excavator. The method comprises the step of: manufacturing a rod blank, wherein the rod blank comprises the following chemical ingredients in percentage by weight: 0.28 to 0.35 percent of C, 0.15 to 0.25 percent of Mn, 0.15 to 0.35 percent of Si, 0.01 to 0.04 percent of W, less than or equal to 0.025 and more than or equal to 0.015 percent of P, less than or equal to 0.035 and more than or equal to 0.015 percent of S, 0.15 to 0.20 percent of Ni, 0.025 to 0.045 percent of Co, 0.02 to 0.03 percent of Sn, less than or equal to 0.02 percent of Al and the balance of Fe. According to the method for forging the bolt for the caterpillar track of the excavator, the bolt is machined by using a cold extrusion process, so that the strength of the bolt is enhanced, a hardness value and a strength value which are required by the high-strength bolt of which the strength is 12.9 are reached, and the delayed breakage and fatigue breakage of the bolt are avoided under high strength; and the bolt is reliable in connection and difficult to break in the using process, so that the service life of the bolt is prolonged, and the using demand of each industry in society on the high-strength bolt is met.
Description
Technical field
The present invention relates to the processing method of bolt, especially a kind of crawler of excavator bolt forging method.
Background technology
The crawler of excavator bolt is securing member commonly used in machinery industry, and present processing mode is generally the moulding of turning, and intensity often is difficult to guarantee, sometimes in use produce turn around, the dangerous phenomenon such as bar section fracture, endanger very large to industrial production.Therefore the high-strength bolt production method is studied and improved, guaranteed the quality stability of high-strength bolt, technology and expanding economy are had important function.In addition, when bolt was in relatively moist environment, the corrosion that gets rusty easily finally caused fracture or crackle, forms potential accident source.
Given this, be necessary to provide the processing method of a kind of crawler of excavator with bolt, produce more corrosion resistant high-strength bolt.
Summary of the invention
The object of the invention is to avoid weak point of the prior art, and a kind of crawler of excavator bolt forging method is provided.
Purpose of the present invention is as follows by the following technical programs:
Crawler of excavator bolt forging method, procedure of processing comprises:
A, casting bar material blank, the percentage by weight of each chemical composition of control lever material blank should satisfy following requirement: C 0.28～0.35, Mn 0.15～0.25, Si 0.15～0.35, W 0.01-0.04,0.015≤P≤0.025,0.015≤S≤0.035, Ni 0.15～0.20, Co 0.025～0.045, Sn 0.02～0.03, Al≤0.02, and surplus is iron;
B, the bar material after casting is carried out forging and molding processing, forge temperature and be controlled to be 630-680 ℃, forging covering thin layer graphite powder on the impression inwall of mould, the granularity of graphite powder is controlled to be the 200-300 order, forge number of times no more than 25 times, utilize fine turning lathe turning to go out the bolt external screw thread after forging moulding;
C, heat treatment, that the bolt external screw thread after turning was heated 8-9 hour under 460-550 ℃ for the first time, be warming up to 1080-1120 ℃ in 20-30 minute again, keep 20 minutes heat time heating times, quench with quenching oil, bolt after quenching again carries out tempering and kept 30 minutes under 500 ℃, then take out from tempering furnace put into 250-270 ℃ No. 200 solvent naphthas with oily slow cooling; Be for the second time the body of rod with bolt under 800 ℃ ± 20 ℃, the use quenching liquid quenches, then the bolt after quenching carries out tempering, 60 minutes duration under 600 ℃;
D, phosphatization are processed, and at first carry out ungrease treatment with 17% ammonia scrubbing, and temperature is controlled between 45-60 ℃, and the time is 6-7 minute, then washing; Carry out pickling processes with 25% hydrochloric acid solution washing again, temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; In 40 ℃ of situations of temperature, immerse in neopelex solution at last, temperature is controlled at 45-57 ℃, and the immersion time is 3-5 minute, cleans up afterwards;
E, blackening process, be under the condition of 120～130 ℃ in temperature, bolt is placed in to process in the 5-8% sodium nitrite solution is grey black or all black to the surface, then bolt is taken out from liquid, and spontaneous curing 15～20min, more fully clean, obtain the finished product bolt after air-dry with water.
Crawler of excavator of the present invention bolt forging method, adopt the processing of cold-extrusion technology bolt, improved the intensity of bolt, reached required hardness number, the intensity level of 12.9 high-strength bolts, solved delayed fracture and the fatigue fracture of bolt under high strength, in use connected reliably, not frangibility, improve bolt life, satisfied social upper every profession and trade to the user demand of high-strength bolt.
Beneficial effect of the present invention is:
1, refinement of the present invention the shaping processing technology of material, make wire rod hardness moderate, the surface has good phosphatization epithelium, greasy property is good, wire rod is without hydrogen embrittlement, plasticity is good;
2, bolt of the present invention has carried out repeatedly cold-forge forming, has improved the high-strength bolt bulk strength, and the bolt precision is high, and quality is good, and production efficiency is high, and without waste material, unit cost descends greatly without cutting.Obtain bulk metal and flowed to the consistent bolt of direction, greatly improved its tensile strength;
3, the invention of Technology for Heating Processing has broken through the limit of the alloy steel products of bolt prior heat treatment, the leading domestic Investment in fastener industry level of the characteristic of its super-strong and super-toughened property.
The specific embodiment
The invention will be further described with the following Examples:
Crawler of excavator bolt forging method, procedure of processing comprises:
A, casting bar material blank, the percentage by weight of each chemical composition of control lever material blank should satisfy following requirement: C 0.28～0.35, Mn 0.15～0.25, Si 0.15～0.35, W 0.01-0.04,0.015≤P≤0.025,0.015≤S≤0.035, Ni 0.15～0.20, Co 0.025～0.045, Sn 0.02～0.03, Al≤0.02, and surplus is iron;
B, the bar material after casting is carried out forging and molding processing, forge temperature and be controlled to be 630-680 ℃, forging covering thin layer graphite powder on the impression inwall of mould, the granularity of graphite powder is controlled to be the 200-300 order, forge number of times no more than 25 times, utilize fine turning lathe turning to go out the bolt external screw thread after forging moulding;
C, heat treatment, that the bolt external screw thread after turning was heated 8-9 hour under 460-550 ℃ for the first time, be warming up to 1080-1120 ℃ in 20-30 minute again, keep 20 minutes heat time heating times, quench with quenching oil, bolt after quenching again carries out tempering and kept 30 minutes under 500 ℃, then take out from tempering furnace put into 250-270 ℃ No. 200 solvent naphthas with oily slow cooling; Be for the second time the body of rod with bolt under 800 ℃ ± 20 ℃, the use quenching liquid quenches, then the bolt after quenching carries out tempering, 60 minutes duration under 600 ℃;
D, phosphatization are processed, and at first carry out ungrease treatment with 17% ammonia scrubbing, and temperature is controlled between 45-60 ℃, and the time is 6-7 minute, then washing; Carry out pickling processes with 25% hydrochloric acid solution washing again, temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; In 40 ℃ of situations of temperature, immerse in neopelex solution at last, temperature is controlled at 45-57 ℃, and the immersion time is 3-5 minute, cleans up afterwards;
E, blackening process are under temperature is the condition of 125 ℃, bolt is placed in to process in the 5-8% sodium nitrite solution is grey black or all black to the surface, then bolt is taken out from liquid, and spontaneous curing 18min, more fully clean, obtain the finished product bolt after air-dry with water.
The bolt of producing according to the preparation method of bolt of the present invention, as follows through detecting its mechanical performance numerical value of test, the bolt centre hardness reaches 50-52HRC, bolt thread section hardness reaches 46-50HRC, tensile strength reaches 1260Mpa, yield strength reaches 1270Mpa, percentage elongation is greater than 12%, and the contraction percentage of area is greater than 35%, and impact flexibility is greater than 50J/cm
2, the high 10-12% of bolt that comprehensive mechanical performance produces than existing technique.
Should be noted that at last; above embodiment only is used for technical scheme of the present invention being described but not limiting the scope of the invention; although with reference to preferred embodiment, the present invention has been done detailed description; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement technical scheme of the present invention, and not break away from essence and the scope of technical solution of the present invention.
Claims (1)
1. crawler of excavator bolt forging method, is characterized in that, procedure of processing comprises:
A, casting bar material blank, the percentage by weight of each chemical composition of control lever material blank should satisfy following requirement: C 0.28～0.35, Mn 0.15～0.25, Si 0.15～0.35, W 0.01-0.04,0.015≤P≤0.025,0.015≤S≤0.035, Ni 0.15～0.20, Co 0.025～0.045, Sn 0.02～0.03, Al≤0.02, and surplus is iron;
B, the bar material after casting is carried out forging and molding processing, forge temperature and be controlled to be 630-680 ℃, forging covering thin layer graphite powder on the impression inwall of mould, the granularity of graphite powder is controlled to be the 200-300 order, forge number of times no more than 25 times, utilize fine turning lathe turning to go out the bolt external screw thread after forging moulding;
C, heat treatment, that the bolt external screw thread after turning was heated 8-9 hour under 460-550 ℃ for the first time, be warming up to 1080-1120 ℃ in 20-30 minute again, keep 20 minutes heat time heating times, quench with quenching oil, bolt after quenching again carries out tempering and kept 30 minutes under 500 ℃, then take out from tempering furnace put into 250-270 ℃ No. 200 solvent naphthas with oily slow cooling; Be for the second time the body of rod with bolt under 800 ℃ ± 20 ℃, the use quenching liquid quenches, then the bolt after quenching carries out tempering, 60 minutes duration under 600 ℃;
D, phosphatization are processed, and at first carry out ungrease treatment with 17% ammonia scrubbing, and temperature is controlled between 45-60 ℃, and the time is 6-7 minute, then washing; Carry out pickling processes with 25% hydrochloric acid solution washing again, temperature is controlled at 18-20 ℃, and the time is 1-2 minute, then washing; In 40 ℃ of situations of temperature, immerse in neopelex solution at last, temperature is controlled at 45-57 ℃, and the immersion time is 3-5 minute, cleans up afterwards;
E, blackening process, be under the condition of 120～130 ℃ in temperature, bolt is placed in to process in the 5-8% sodium nitrite solution is grey black or all black to the surface, then bolt is therefrom taken out, and spontaneous curing 15～20min, more fully clean, obtain the finished product bolt after air-dry with water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210511671.5A CN103084797B (en) | 2012-12-04 | 2012-12-04 | Crawler of excavator bolt forging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210511671.5A CN103084797B (en) | 2012-12-04 | 2012-12-04 | Crawler of excavator bolt forging method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103084797A true CN103084797A (en) | 2013-05-08 |
| CN103084797B CN103084797B (en) | 2016-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210511671.5A Expired - Fee Related CN103084797B (en) | 2012-12-04 | 2012-12-04 | Crawler of excavator bolt forging method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103084797B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105296850A (en) * | 2015-11-03 | 2016-02-03 | 合肥海源机械有限公司 | Preparation method of high-temperature-resistant engine crankshaft bearing bush |
| CN105401078A (en) * | 2015-11-03 | 2016-03-16 | 合肥海源机械有限公司 | Method for producing automobile engine rocker shaft |
| CN106381449A (en) * | 2016-09-23 | 2017-02-08 | 安徽丰磊制冷工程有限公司 | Preparation method of low-alloy air purifier filter screen |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0565540A (en) * | 1991-09-10 | 1993-03-19 | Nissan Motor Co Ltd | Manufacture of high strength bolt |
| CN101169150A (en) * | 2007-11-29 | 2008-04-30 | 贵州航天新力铸锻有限责任公司 | Million - kilowatts class nuclear power station reactor main bolt production process |
| CN101549449A (en) * | 2008-03-31 | 2009-10-07 | 江都狮鹤高强度螺栓有限公司 | Processing technology of high-strength large hexagon head bolt for steel structure |
| CN101890618A (en) * | 2010-06-17 | 2010-11-24 | 鹏驰五金制品有限公司 | Processing method of high-strength bolts |
| CN101934466A (en) * | 2009-06-30 | 2011-01-05 | 江都狮鹤高强度螺栓有限公司 | Technology for processing high strength large hexagon-headed bolt used for steel structure |
| CN102072234A (en) * | 2010-11-19 | 2011-05-25 | 浙江高强度紧固件有限公司 | Production process of nuclear bolt |
| CN102319990A (en) * | 2011-09-30 | 2012-01-18 | 山推工程机械股份有限公司 | Manufacturing process of low-carbon high-strength bolt for track |
-
2012
- 2012-12-04 CN CN201210511671.5A patent/CN103084797B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0565540A (en) * | 1991-09-10 | 1993-03-19 | Nissan Motor Co Ltd | Manufacture of high strength bolt |
| CN101169150A (en) * | 2007-11-29 | 2008-04-30 | 贵州航天新力铸锻有限责任公司 | Million - kilowatts class nuclear power station reactor main bolt production process |
| CN101549449A (en) * | 2008-03-31 | 2009-10-07 | 江都狮鹤高强度螺栓有限公司 | Processing technology of high-strength large hexagon head bolt for steel structure |
| CN101934466A (en) * | 2009-06-30 | 2011-01-05 | 江都狮鹤高强度螺栓有限公司 | Technology for processing high strength large hexagon-headed bolt used for steel structure |
| CN101890618A (en) * | 2010-06-17 | 2010-11-24 | 鹏驰五金制品有限公司 | Processing method of high-strength bolts |
| CN102072234A (en) * | 2010-11-19 | 2011-05-25 | 浙江高强度紧固件有限公司 | Production process of nuclear bolt |
| CN102319990A (en) * | 2011-09-30 | 2012-01-18 | 山推工程机械股份有限公司 | Manufacturing process of low-carbon high-strength bolt for track |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105296850A (en) * | 2015-11-03 | 2016-02-03 | 合肥海源机械有限公司 | Preparation method of high-temperature-resistant engine crankshaft bearing bush |
| CN105401078A (en) * | 2015-11-03 | 2016-03-16 | 合肥海源机械有限公司 | Method for producing automobile engine rocker shaft |
| CN106381449A (en) * | 2016-09-23 | 2017-02-08 | 安徽丰磊制冷工程有限公司 | Preparation method of low-alloy air purifier filter screen |
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| CN103084797B (en) | 2016-12-14 |
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Effective date of registration: 20160920 Address after: 241200 Anhui Province, Wuhu City asan cypress Fanchang County Town Village Industrial Park Applicant after: WUHU CHUANGYUAN NEW MATERIALS Co.,Ltd. Address before: 241000 Anhui Province, Wuhu Yongchang City Jiujiang Road Development Zone No. 69 Applicant before: Anhui Liufang Zhonglian Mechanical Share Co.,Ltd. |
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Inventor after: Zeng Shanghuai Inventor before: Wang Lixin |
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Effective date of registration: 20161101 Address after: 401320 Chongqing District of Banan City Jinzhu Industrial Park Applicant after: Chongqing Jiewei Mold Manufacturing Co.,Ltd. Address before: Tianhe District Tong East Road Guangzhou city Guangdong province 510665 B-101 No. 5, room B-118 Applicant before: GUANGDONG GAOHANG INTELLECTUAL PROPERTY OPERATION Co.,Ltd. Effective date of registration: 20161101 Address after: Tianhe District Tong East Road Guangzhou city Guangdong province 510665 B-101 No. 5, room B-118 Applicant after: GUANGDONG GAOHANG INTELLECTUAL PROPERTY OPERATION Co.,Ltd. Address before: 241200 Anhui Province, Wuhu City asan cypress Fanchang County Town Village Industrial Park Applicant before: WUHU CHUANGYUAN NEW MATERIALS Co.,Ltd. |
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Effective date of registration: 20180613 Address after: 362302 Fujian Nanan city of Xia Mei Binjiang auto distribution base Patentee after: QUANZHOU HUANGSHENGDA AUTO ACCESSORIES INDUSTRY &TRADE Co.,Ltd. Address before: 401320 Jin Zhu Industrial Park, Banan District, Chongqing Patentee before: Chongqing Jiewei Mold Manufacturing Co.,Ltd. |
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Granted publication date: 20161214 Termination date: 20191204 |