CN102773399A - Machining process of engineering machinery crawler belt nut - Google Patents

Machining process of engineering machinery crawler belt nut Download PDF

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Publication number
CN102773399A
CN102773399A CN2012102401977A CN201210240197A CN102773399A CN 102773399 A CN102773399 A CN 102773399A CN 2012102401977 A CN2012102401977 A CN 2012102401977A CN 201210240197 A CN201210240197 A CN 201210240197A CN 102773399 A CN102773399 A CN 102773399A
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CN
China
Prior art keywords
steel billet
crawler belt
engineering machinery
nut
carried
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2012102401977A
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Chinese (zh)
Inventor
沈海波
马为明
孙宏伟
张友平
潘中海
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HAIYAN SANMA STANDARD HARDWARE CO Ltd
Original Assignee
HAIYAN SANMA STANDARD HARDWARE CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HAIYAN SANMA STANDARD HARDWARE CO Ltd filed Critical HAIYAN SANMA STANDARD HARDWARE CO Ltd
Priority to CN2012102401977A priority Critical patent/CN102773399A/en
Publication of CN102773399A publication Critical patent/CN102773399A/en
Pending legal-status Critical Current

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Abstract

The invention provides a machining method of an engineering machinery crawler belt nut, wherein the machining method comprises the following steps: step 1. modifying a billet; step 2. manufacturing a punching bar; step 3. tapping; and step 4. carrying out heat treatment. The accuracy machining of an ultra-heavy nut can be realized; the scrapping rate can be reduced; also the technology is simple; and the tolerance control is accurate, thus the nut yield is high, and the service life is long.

Description

A kind of engineering machinery crawler belt nut processing method
Technical field
The present invention relates to the processing method of superduty nut, be specifically related to a kind of engineering machinery crawler belt nut processing method.
Background technology
Forge hot is adopted in the processing of nut usually in the prior art, and forge hot has the advantage of three aspects: 1, can reduce the metal deformation drag, thereby reduce the required forging force of stock distortion, the forging equipment tonnage is greatly reduced; 2, can change the as-cast structure of steel ingot, through crystallization again, thick as-cast structure becomes the new organization of small grains in hot forging process, and reduces the defective of as-cast structure, improves the mechanical performance of steel; 3, improve the plasticity of steel, this during to some low temperature the more crisp high-alloy steel that is difficult to forge and press particularly important.But along with the increase of nut processing dimension, the demand of processing has been satisfied not in forge hot gradually, particularly when the extra-duty engineering machinery crawler belt nut of processing; Because the height of the nut of required processing is more than 2 times of diameter of bore, the height of nut is too high, causes when carrying out the blank forge hot, can forming tear-strap; And to carry out the Vehicle Processing of endoporus again; Make the technology more complicated, accuracy is not high, and scrappage is high.Also have and adopt cold forging to carry out nut processing; Cold forging is to the processing and forming below the material recrystallization temperature; Be the forging of below recovery temperature, carrying out, the cold forging material mostly is less, the plasticity of resistance of deformation aluminium and alloy part, copper and alloy part, mild steel, medium carbon steel, a low-alloy structural steel preferably under the room temperature.Cold forging spare surface quality is good, and dimensional accuracy is high, can replace some cut.Cold forging can make metal strengthening, improves the intensity of part.Cold forging technology forming accuracy is all higher than warm forging and forge hot, in the precision form field its special advantages is arranged.But for the processing of engineering machinery crawler belt nut, because the height of the nut of required processing is more than 2 times of diameter of bore, the height of nut is too high, and cold forging can't directly be realized.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of engineering machinery crawler belt nut processing method, can realize the precision processing of superduty nut, reduce scrappage, and technology is simple, and tolerance control accurately makes that the output of nut is big, long service life.
For solving above-mentioned existing technical problem, the present invention provides following scheme: a kind of engineering machinery crawler belt nut processing method may further comprise the steps:
Step 1: steel billet upgrading: steel billet is carried out the spheroidizing first time, and temperature employing Ac1 point+50 of annealing ~ 70 ° are carried out the pickling wire drawing then, and steel billet is pulled to diameter 28.2mm by diameter 30mm; Again steel billet is carried out the spheroidizing second time, annealing temperature adopts the Ac1 point, carries out the pickling wire drawing then, and steel billet is pulled to diameter 27.8mm by diameter 28.2mm;
Step 2: the punching rod is made: adopt six station cold-forging methods that the steel billet of processing in the step 1 is carried out cold forging, said six station cold-forging methods promptly adopt six substeps to forge and press the punching moulding, form the punching rod;
Step 3: tapping: the punching rod in the step 2 is carried out the tapping operation;
Step 4: heat treatment: to the punching rod after the tapping in the step 3 carry out preceding cleaning, quenching, tempering successively, the back is cleaned and is oiled, hardening heat adopts 880 ± 10 °, temperature adopts 490 ± 10 °.
As preferably, adopting up and down during six station cold forgings in the said step 2, symmetry forges and presses simultaneously.Impulsive force when making forging and pressing is symmetry on average, change metal flow to, avoided cracking.
As preferably, hardening heat adopts 880 ° in the said step 4.Hardening heat is moderate, has guaranteed the quality of production of nut.
As preferably, temperature adopts 490 ° in the said step 4.Guaranteed the quality of production of nut.
Beneficial effect:
The present invention adopts technique scheme that a kind of engineering machinery crawler belt nut processing method is provided, and earlier to the steel billet upgrading, has improved the nodularization rate, makes to organize meticulously, and the plasticity of material is good, has reduced hardness, has guaranteed follow-up cold forging operation; Adopt six station cold-forging methods to carry out the cold-forge forming of punching rod then, the impulsive force when making forging and pressing is symmetry on average, change metal flow to, avoided cracking; Carry out tapping again; Heat-treat at last.Realized the precision processing of superduty nut, reduced scrappage, and technology has been simple, tolerance control accurately makes that the output of nut is big, long service life.
The specific embodiment
A kind of engineering machinery crawler belt nut processing method may further comprise the steps:
Step 1: steel billet upgrading: steel billet is carried out the spheroidizing first time, and temperature employing Ac1 point+50 of annealing ~ 70 ° are carried out the pickling wire drawing then, and steel billet is pulled to diameter 28.2mm by diameter 30mm; Again steel billet is carried out the spheroidizing second time, annealing temperature adopts the Ac1 point, carries out the pickling wire drawing then, and steel billet is pulled to diameter 27.8mm by diameter 28.2mm;
Step 2: the punching rod is made: adopt six station cold-forging methods that the steel billet of processing in the step 1 is carried out cold forging, said six station cold-forging methods promptly adopt six substeps to forge and press the punching moulding, and symmetry forges and presses simultaneously about adopting, and form the punching rod;
Step 3: tapping: the punching rod in the step 2 is carried out the tapping operation;
Step 4: heat treatment: to the punching rod after the tapping in the step 3 carry out preceding cleaning, quenching, tempering successively, the back is cleaned and is oiled, hardening heat adopts 880 °, temperature adopts 490 °.
Steel billet upgrading in the step 1 has improved the nodularization rate, makes to organize meticulously, and the plasticity of material is good, has reduced hardness, has guaranteed follow-up cold forging operation; Impulsive force when six station cold forgings in the step 2 make forging and pressing is symmetry on average, change metal flow to, avoided cracking.Realized the precision processing of superduty nut, reduced scrappage, and technology has been simple, tolerance control accurately makes that the output of nut is big, long service life.
Processing method provided by the invention is applicable to the manufacturing of tetragonal superduty nut; When the manufacturing of the superduty nut that carries out hexagonal; Because the corner is difficult to moulding, between step 1 and step 2, add the preformed operation, promptly utilize the hexagonal bar that contracts to carry out the extruding preformed of corner.
Specific embodiment described herein only is that the present invention's spirit is illustrated; Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.

Claims (4)

1. engineering machinery crawler belt nut processing method is characterized in that: may further comprise the steps:
Step 1: steel billet upgrading: steel billet is carried out the spheroidizing first time, and temperature employing Ac1 point+50 of annealing ~ 70 ° are carried out the pickling wire drawing then, and steel billet is pulled to diameter 28.2mm by diameter 30mm; Again steel billet is carried out the spheroidizing second time, annealing temperature adopts the Ac1 point, carries out the pickling wire drawing then, and steel billet is pulled to diameter 27.8mm by diameter 28.2mm;
Step 2: the punching rod is made: adopt six station cold-forging methods that the steel billet of processing in the step 1 is carried out cold forging, said six station cold-forging methods promptly adopt six substeps to forge and press the punching moulding, form the punching rod;
Step 3: tapping: the punching rod in the step 2 is carried out the tapping operation;
Step 4: heat treatment: to the punching rod after the tapping in the step 3 carry out preceding cleaning, quenching, tempering successively, the back is cleaned and is oiled, hardening heat adopts 880 ± 10 °, temperature adopts 490 ± 10 °.
2. a kind of engineering machinery crawler belt nut processing method according to claim 1 is characterized in that: adopting during six station cold forgings up and down in the said step 2, symmetry forges and presses simultaneously.
3. a kind of engineering machinery crawler belt nut processing method according to claim 1 is characterized in that: hardening heat adopts 880 ° in the said step 4.
4. a kind of engineering machinery crawler belt nut processing method according to claim 1 is characterized in that: temperature adopts 490 ° in the said step 4.
CN2012102401977A 2012-07-12 2012-07-12 Machining process of engineering machinery crawler belt nut Pending CN102773399A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012102401977A CN102773399A (en) 2012-07-12 2012-07-12 Machining process of engineering machinery crawler belt nut

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012102401977A CN102773399A (en) 2012-07-12 2012-07-12 Machining process of engineering machinery crawler belt nut

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CN102773399A true CN102773399A (en) 2012-11-14

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108611471A (en) * 2018-07-06 2018-10-02 江苏南钢通恒特材科技有限公司 20MnCr5 incudes normalizing process
CN109957647A (en) * 2019-04-10 2019-07-02 宁波瑞国精机工业有限公司 A kind of processing technology of automobile-used iron chains pin
CN111471844A (en) * 2020-04-02 2020-07-31 北京科技大学 Treatment method for realizing superplasticity of graphitized steel

Citations (7)

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Publication number Priority date Publication date Assignee Title
US4119130A (en) * 1977-02-25 1978-10-10 Microdot Inc. Barrel nut and method of manufacture
JPS60154839A (en) * 1984-01-24 1985-08-14 Nissan Motor Co Ltd Production of nut
CN1031864A (en) * 1988-08-01 1989-03-22 湖南省冷水滩耐火材料厂 A kind of Steel Bond Hard Alloy and manufacture craft thereof
CN1087848A (en) * 1992-12-09 1994-06-15 沈阳市高压螺栓厂 The manufacture method of high strength nut
CN101767179A (en) * 2009-12-31 2010-07-07 上海新闵重型锻造有限公司 Method for forging screw and nut
CN101780628A (en) * 2010-03-08 2010-07-21 苏州工业园区新凯精密五金有限公司 Processing process for compressing and riveting nuts
CN102227512A (en) * 2009-11-17 2011-10-26 新日本制铁株式会社 Steel wire for low-temperature annealing and method for producing same

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119130A (en) * 1977-02-25 1978-10-10 Microdot Inc. Barrel nut and method of manufacture
JPS60154839A (en) * 1984-01-24 1985-08-14 Nissan Motor Co Ltd Production of nut
CN1031864A (en) * 1988-08-01 1989-03-22 湖南省冷水滩耐火材料厂 A kind of Steel Bond Hard Alloy and manufacture craft thereof
CN1087848A (en) * 1992-12-09 1994-06-15 沈阳市高压螺栓厂 The manufacture method of high strength nut
CN102227512A (en) * 2009-11-17 2011-10-26 新日本制铁株式会社 Steel wire for low-temperature annealing and method for producing same
CN101767179A (en) * 2009-12-31 2010-07-07 上海新闵重型锻造有限公司 Method for forging screw and nut
CN101780628A (en) * 2010-03-08 2010-07-21 苏州工业园区新凯精密五金有限公司 Processing process for compressing and riveting nuts

Non-Patent Citations (1)

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Title
张永新: "法兰面螺母冷镦开裂分析", 《化学工程与装备》, no. 12, 31 December 2010 (2010-12-31) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108611471A (en) * 2018-07-06 2018-10-02 江苏南钢通恒特材科技有限公司 20MnCr5 incudes normalizing process
CN109957647A (en) * 2019-04-10 2019-07-02 宁波瑞国精机工业有限公司 A kind of processing technology of automobile-used iron chains pin
CN111471844A (en) * 2020-04-02 2020-07-31 北京科技大学 Treatment method for realizing superplasticity of graphitized steel

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