CN107447221A - The heat treatment method of connecting-rod bolts - Google Patents
The heat treatment method of connecting-rod bolts Download PDFInfo
- Publication number
- CN107447221A CN107447221A CN201710613925.7A CN201710613925A CN107447221A CN 107447221 A CN107447221 A CN 107447221A CN 201710613925 A CN201710613925 A CN 201710613925A CN 107447221 A CN107447221 A CN 107447221A
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- CN
- China
- Prior art keywords
- rod bolts
- minutes
- temperature
- rod
- bolts
- 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.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0093—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for screws; for bolts
Abstract
The invention discloses a kind of heat treatment method of connecting-rod bolts, comprise the following steps：A, bar is passed through into die-forging forming connecting-rod bolts forging stock；B, connecting-rod bolts forging stock is extruded into knife extrusion process by screw thread and obtains connecting-rod bolts；C, the threaded portion of connecting-rod bolts is quenched, then again quenched the bar portion of connecting-rod bolts；Connecting-rod bolts after quenching are subjected to Carburization Treatment；D, the connecting-rod bolts for completing heat treatment are subjected to alkali cleaning degreasing, pickling, after drying, connecting-rod bolts are immersed in surface phosphorization treatment fluid and handled；E, the heat treatment of connecting-rod bolts will be completed after connecting-rod bolts progress blackening process.Than prior art, the present invention can solve the delayed fracture and fatigue fracture of high intensity lower link bolt, and connection is reliable in use, is not easily broken, improves the service life of connecting-rod bolts.
Description
Technical field
The present invention relates to bolt manufacturing technology field, especially a kind of heat treatment side for being used to fasten the connecting-rod bolts of connecting rod
Method.
Background technology
Connecting-rod bolts fasten the key component of connecting rod, are by the connecting rod cap of subdivision and the affixed fastener of big end, its matter
The quality of amount directly affects the security of connecting rod work；Usual connecting-rod bolts use superior alloy steel or the conditioned heat of quality carbon steel
The shaping of turning after processing；Turning shaping connecting-rod bolts strength and stiffness are difficult to ensure that phenomena such as fracture easily occurs in bar portion, and
When connecting-rod bolts are in the environment of relative humidity, get rusty easily corrosion, causes easily to form the accident source cracked.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of heat treatment method of connecting-rod bolts, to solve existing connecting rod
The processing method of bolt easily forms the problem of cracking.
The technical proposal for solving the technical problem of the invention is：A kind of heat treatment method of connecting-rod bolts, it includes
Following steps：
A, first by bar by die-forging forming connecting-rod bolts forging stock, initial forging temperature is 1100 DEG C, and final forging temperature is 800 DEG C；Again will
Connecting-rod bolts forging stock carries out normalizing, and connecting-rod bolts forging stock is bulked in normalizing furnace, and temperature is 870 DEG C ± 10 DEG C, is incubated 10 points
Afterwards room temperature is air-cooled to from taking-up；
B, connecting-rod bolts forging stock is extruded into knife extrusion process by screw thread and obtains connecting-rod bolts, connecting-rod bolts have bar portion and with the bar
The threaded portion of portion's connection；
C、（1）The threaded portion of connecting-rod bolts is heated to 400 DEG C~450 DEG C, is incubated 10 hours~12 hours；Will 20 minutes~
Threaded portion is heated to 1000 DEG C~1100 DEG C in 30 minutes, after being incubated 10 minutes, quenched with quenching oil；After quenching
The threaded portion of connecting-rod bolts is heated to 490 DEG C~510 DEG C, is incubated 30 minutes, and taking-up is put into solvent naphtha with oily slow cooling；
（2）The bar portion of connecting-rod bolts is heated to 810 DEG C ± 10 DEG C again, quenched with water-based quenching liquid, the company after quenching
For bar bolt loaded in normalizing furnace, temperature is 600 ± 10 DEG C, after being incubated 60 minutes, carburizer is put into tempering furnace, 1100
DEG C~1150 DEG C of temperature ranges in Carburization Treatment 50 minutes~120 minutes；
D, the connecting-rod bolts of completion Carburization Treatment are carried out alkali cleaning degreasing, pickling, dried, connecting-rod bolts are immersed at alramenting
Handled 4 minutes~5 minutes in reason liquid, temperature is 100 DEG C~120 DEG C；
E, connecting-rod bolts are subjected to blackening process, temperature is 100 DEG C~110 DEG C, and the time is 25 minutes~30 minutes i.e. company of completion
The heat treatment of bar bolt.
By adopting the above-described technical solution, the present invention has the advantages that compared with prior art：This connecting rod spiral shell
Using after die-forging forming connecting-rod bolts forging stock carry out extrusion process shaping, meanwhile, and it has been carried out quenching, tempering, carburizing and
Black, improve the strength and stiffness of bolt, reached hardness number needed for high-strength bolt, intensity level；Solves high intensity
The delayed fracture and fatigue fracture of lower link bolt, connection is reliable in use, is not easily broken, improves the use of connecting-rod bolts
Life-span.
Embodiment
Below in conjunction with example, the invention will be further described：
Embodiment 1：
A kind of heat treatment method of connecting-rod bolts, it comprises the following steps：
A, first by bar by die-forging forming connecting-rod bolts forging stock, initial forging temperature is 1100 DEG C, and final forging temperature is 800 DEG C；Again will
Connecting-rod bolts forging stock carries out normalizing, and connecting-rod bolts forging stock is bulked in normalizing furnace, and temperature is 870 DEG C ± 10 DEG C, is incubated 10 points
Afterwards room temperature is air-cooled to from taking-up；
B, connecting-rod bolts forging stock is extruded into knife extrusion process by screw thread and obtains connecting-rod bolts, connecting-rod bolts have bar portion and with the bar
The threaded portion of portion's connection；
C、（1）The threaded portion of connecting-rod bolts is heated to 400 DEG C~450 DEG C, is incubated 10 hours；Will be in 20 minutes by threaded portion
1000 DEG C~1100 DEG C are heated to, after being incubated 10 minutes, is quenched with quenching oil；By the threaded portion of the connecting-rod bolts after quenching
490 DEG C~510 DEG C are heated to, is incubated 30 minutes, taking-up is put into solvent naphtha with oily slow cooling；
（2）The bar portion of connecting-rod bolts is heated to 810 DEG C ± 10 DEG C again, quenched with water-based quenching liquid, the company after quenching
For bar bolt loaded in normalizing furnace, temperature is 600 ± 10 DEG C, after being incubated 60 minutes, carburizer is put into tempering furnace, 1100
DEG C~1150 DEG C of temperature ranges in Carburization Treatment 50 minutes；
D, the connecting-rod bolts of completion Carburization Treatment are carried out alkali cleaning degreasing, pickling, dried, connecting-rod bolts are immersed at alramenting
Handled 4 minutes in reason liquid, temperature is 100 DEG C~120 DEG C；
E, connecting-rod bolts are subjected to blackening process, temperature is 100 DEG C~110 DEG C, and the time is to complete connecting-rod bolts in 25 minutes
Heat treatment.
Embodiment 2：
A kind of heat treatment method of connecting-rod bolts, it comprises the following steps：
A, first by bar by die-forging forming connecting-rod bolts forging stock, initial forging temperature is 1100 DEG C, and final forging temperature is 800 DEG C；Again will
Connecting-rod bolts forging stock carries out normalizing, and connecting-rod bolts forging stock is bulked in normalizing furnace, and temperature is 870 DEG C ± 10 DEG C, is incubated 10 points
Afterwards room temperature is air-cooled to from taking-up；
B, connecting-rod bolts forging stock is extruded into knife extrusion process by screw thread and obtains connecting-rod bolts, connecting-rod bolts have bar portion and with the bar
The threaded portion of portion's connection；
C、（1）The threaded portion of connecting-rod bolts is heated to 400 DEG C~450 DEG C, is incubated 12 hours；Will be in 30 minutes by threaded portion
1000 DEG C~1100 DEG C are heated to, after being incubated 10 minutes, is quenched with quenching oil；By the threaded portion of the connecting-rod bolts after quenching
490 DEG C~510 DEG C are heated to, is incubated 30 minutes, taking-up is put into solvent naphtha with oily slow cooling；
（2）The bar portion of connecting-rod bolts is heated to 810 DEG C ± 10 DEG C again, quenched with water-based quenching liquid, the company after quenching
For bar bolt loaded in normalizing furnace, temperature is 600 ± 10 DEG C, after being incubated 60 minutes, carburizer is put into tempering furnace, 1100
DEG C~1150 DEG C of temperature ranges in Carburization Treatment 120 minutes；
D, the connecting-rod bolts of completion Carburization Treatment are carried out alkali cleaning degreasing, pickling, dried, connecting-rod bolts are immersed at alramenting
Handled 5 minutes in reason liquid, temperature is 100 DEG C~120 DEG C；
E, connecting-rod bolts are subjected to blackening process, temperature is 100 DEG C~110 DEG C, and the time is to complete connecting-rod bolts in 30 minutes
Heat treatment.
Extrusion process shaping is carried out after using die-forging forming connecting-rod bolts forging stock due to connecting rod spiral shell, meanwhile, and it is carried out
Quenching, tempering, carburizing and nigrescence, the strength and stiffness of bolt are improved, reached hardness number needed for high-strength bolt, strong
Angle value；Solve the delayed fracture and fatigue fracture of high intensity lower link bolt, connection is reliable in use, is not easily broken, carries
The high service life of connecting-rod bolts.
Claims (1)
1. a kind of heat treatment method of connecting-rod bolts, it is characterised in that comprise the following steps：
A, first by bar by die-forging forming connecting-rod bolts forging stock, initial forging temperature is 1100 DEG C, and final forging temperature is 800 DEG C；Again will
Connecting-rod bolts forging stock carries out normalizing, and connecting-rod bolts forging stock is bulked in normalizing furnace, and temperature is 870 DEG C ± 10 DEG C, is incubated 10 points
Afterwards room temperature is air-cooled to from taking-up；
B, connecting-rod bolts forging stock is extruded into knife extrusion process by screw thread and obtains connecting-rod bolts, connecting-rod bolts have bar portion and with the bar
The threaded portion of portion's connection；
C、（1）The threaded portion of connecting-rod bolts is heated to 400 DEG C~450 DEG C, is incubated 10 hours~12 hours；Will 20 minutes~
Threaded portion is heated to 1000 DEG C~1100 DEG C in 30 minutes, after being incubated 10 minutes, quenched with quenching oil；After quenching
The threaded portion of connecting-rod bolts is heated to 490 DEG C~510 DEG C, is incubated 30 minutes, and taking-up is put into solvent naphtha with oily slow cooling；
（2）The bar portion of connecting-rod bolts is heated to 810 DEG C ± 10 DEG C again, quenched with water-based quenching liquid, the company after quenching
For bar bolt loaded in normalizing furnace, temperature is 600 ± 10 DEG C, after being incubated 60 minutes, carburizer is put into tempering furnace, 1100
DEG C~1150 DEG C of temperature ranges in Carburization Treatment 50 minutes~120 minutes；
D, the connecting-rod bolts of completion Carburization Treatment are carried out alkali cleaning degreasing, pickling, dried, connecting-rod bolts are immersed at alramenting
Handled 4 minutes~5 minutes in reason liquid, temperature is 100 DEG C~120 DEG C；
E, connecting-rod bolts are subjected to blackening process, temperature is 100 DEG C~110 DEG C, and the time is 25 minutes~30 minutes i.e. company of completion
The heat treatment of bar bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710613925.7A CN107447221A (en) | 2017-07-25 | 2017-07-25 | The heat treatment method of connecting-rod bolts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710613925.7A CN107447221A (en) | 2017-07-25 | 2017-07-25 | The heat treatment method of connecting-rod bolts |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107447221A true CN107447221A (en) | 2017-12-08 |
Family
ID=60487535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710613925.7A Withdrawn CN107447221A (en) | 2017-07-25 | 2017-07-25 | The heat treatment method of connecting-rod bolts |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107447221A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112894284A (en) * | 2021-02-01 | 2021-06-04 | 温州市盛日汽车附件有限公司 | Production process of torsional shear type bolt |
| CN116790871A (en) * | 2023-08-25 | 2023-09-22 | 江苏泰隆减速机股份有限公司 | Hardening and tempering heat treatment device for gear of hard tooth surface speed reducer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03193823A (en) * | 1989-12-22 | 1991-08-23 | Daido Steel Co Ltd | Production of high strength stainless steel bolt for structural use |
| CN103028685A (en) * | 2012-12-04 | 2013-04-10 | 安徽六方重联机械股份有限公司 | Processing method for high-class bolt |
| CN103089781A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Method for machining high-strength double end bolt |
| CN103084532A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Method for machining T-shaped bolt |
| CN104625617A (en) * | 2014-12-13 | 2015-05-20 | 海盐双赢管件制造有限公司 | High-strength bolt production process |
-
2017
- 2017-07-25 CN CN201710613925.7A patent/CN107447221A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03193823A (en) * | 1989-12-22 | 1991-08-23 | Daido Steel Co Ltd | Production of high strength stainless steel bolt for structural use |
| CN103028685A (en) * | 2012-12-04 | 2013-04-10 | 安徽六方重联机械股份有限公司 | Processing method for high-class bolt |
| CN103089781A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Method for machining high-strength double end bolt |
| CN103084532A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Method for machining T-shaped bolt |
| CN104625617A (en) * | 2014-12-13 | 2015-05-20 | 海盐双赢管件制造有限公司 | High-strength bolt production process |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112894284A (en) * | 2021-02-01 | 2021-06-04 | 温州市盛日汽车附件有限公司 | Production process of torsional shear type bolt |
| CN116790871A (en) * | 2023-08-25 | 2023-09-22 | 江苏泰隆减速机股份有限公司 | Hardening and tempering heat treatment device for gear of hard tooth surface speed reducer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20171208 |
|
| WW01 | Invention patent application withdrawn after publication |