CN111842774A - Outer hexagonal cross bolt machining process - Google Patents
Outer hexagonal cross bolt machining process Download PDFInfo
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- CN111842774A CN111842774A CN202010747107.8A CN202010747107A CN111842774A CN 111842774 A CN111842774 A CN 111842774A CN 202010747107 A CN202010747107 A CN 202010747107A CN 111842774 A CN111842774 A CN 111842774A
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- Prior art keywords
- bolt
- treatment
- parts
- cooling
- hexagonal cross
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/44—Making machine elements bolts, studs, or the like
- B21K1/46—Making machine elements bolts, studs, or the like with heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/06—Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other
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- 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
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a processing technology of an outer hexagonal cross bolt, which comprises the following steps: s1, selecting blanks, preparing the blanks according to the design, and selecting the blanks with proper specifications; s2, carrying out acid washing treatment on the blank; s3, performing multi-station cold heading forming on the blank by using cold heading equipment, and forming a bolt head and a screw rod through a die; s4, performing heat treatment on the bolt; s5, processing threads on the surface of the bolt by using a thread rolling machine; s6, performing surface treatment on the bolt; s7, flaw detection to obtain a finished product; the invention has reasonable design of the whole process flow, good mechanical property of the bolt, high integral strength, good quality, less generated waste and reduced cost.
Description
Technical Field
The invention relates to the technical field of bolt processing, in particular to a processing technology of an outer hexagonal cross bolt.
Background
Bolt: mechanical parts, cylindrical threaded fasteners fitted with nuts. A fastener consisting of a head part and a screw (a cylinder with external threads) needs to be matched with a nut and is used for fastening and connecting two parts with through holes. This form of connection is known as a bolted connection. If the nut is unscrewed from the bolt, the two parts can be separated, so that the bolt connection belongs to detachable connection. The traditional bolt mostly has the problems of insufficient strength, easy breakage and the like, so that the research on how to improve the bolt machining process so as to improve the bolt strength is a very important research direction.
Disclosure of Invention
The invention aims to provide a processing technology of an outer hexagonal cross bolt, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a processing technology of an outer hexagonal cross bolt comprises the following steps:
s1, selecting blanks, preparing the blanks according to the design, and selecting the blanks with proper specifications;
s2, carrying out acid washing treatment on the blank;
s3, performing multi-station cold heading forming on the blank by using cold heading equipment, and forming a bolt head and a screw rod through a die;
s4, performing heat treatment on the bolt;
s5, processing threads on the surface of the bolt by using a thread rolling machine;
s6, performing surface treatment on the bolt;
and S7, carrying out flaw detection to obtain a finished product.
As a further scheme of the invention: the blank comprises the following components in parts by weight: 2-5 parts of C, 1-3 parts of Si, 5-10 parts of Mn, 0.03-0.5 part of P, 0.01-0.5 part of S, 5-10 parts of Cr, 2-3 parts of Mo, 0.5-1.5 parts of V, 0.1-1 part of W and 120-150 parts of Fe.
As a further scheme of the invention: the heat treatment in step S4 specifically includes the following steps:
A. putting the bolt into a normalizing furnace for normalizing treatment, and then taking out and putting the bolt into fine sand for cooling;
B. putting the bolt into a quenching furnace for quenching treatment, and then sequentially carrying out primary cooling treatment and secondary cooling treatment;
C. and (4) putting the bolt into a tempering furnace for tempering treatment, and then putting the bolt into air for natural cooling.
As a further scheme of the invention: the normalizing treatment temperature in the step A is 900-950 ℃, the treatment time is 60-80min, and the temperature is cooled to 500 ℃.
As a further scheme of the invention: and B, quenching time in the step B is 30-40min, primary cooling is water cooling, and secondary cooling is oil cooling.
As a further scheme of the invention: the tempering temperature in the step C is 500-530 ℃, and the treatment time is 30-40 min.
As a further scheme of the invention: the surface treatment in step S6 specifically includes the following steps:
a) soaking the bolt in hydrochloric acid, taking out after a period of time, and cleaning with clear water;
b) immersing the bolt in the treating liquid, taking out after a period of time, washing with clear water, and drying in an oven.
As a further scheme of the invention: the soaking time in the step a) is 5-10min, the treatment temperature in the step b) is 70-90 ℃, the soaking time is 3-5min, and the treatment liquid is a mixed solution of zinc dihydrogen phosphate, zinc nitrate and sodium carbonate.
Compared with the prior art, the invention has the beneficial effects that:
the invention has reasonable design of the whole process flow, good mechanical property of the bolt, high integral strength, good quality, less generated waste and reduced cost.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a processing technology of an outer hexagonal cross bolt comprises the following steps:
s1, selecting blanks, preparing the blanks according to the design, and selecting the blanks with proper specifications;
s2, carrying out acid washing treatment on the blank;
s3, performing multi-station cold heading forming on the blank by using cold heading equipment, and forming a bolt head and a screw rod through a die;
s4, performing heat treatment on the bolt;
s5, processing threads on the surface of the bolt by using a thread rolling machine;
s6, performing surface treatment on the bolt;
and S7, carrying out flaw detection to obtain a finished product.
The blank comprises the following components in parts by weight: 2 parts of C, 1 part of Si, 5 parts of Mn, 0.03 part of P, 0.01 part of S, 5 parts of Cr, 2 parts of Mo, 0.5 part of V, 0.1 part of W and 120 parts of Fe.
The heat treatment in step S4 specifically includes the following steps:
A. putting the bolt into a normalizing furnace for normalizing treatment, and then taking out and putting the bolt into fine sand for cooling;
B. putting the bolt into a quenching furnace for quenching treatment, and then sequentially carrying out primary cooling treatment and secondary cooling treatment;
C. and (4) putting the bolt into a tempering furnace for tempering treatment, and then putting the bolt into air for natural cooling.
And B, the normalizing treatment temperature in the step A is 900 ℃, the treatment time is 60min, and the temperature is cooled to 500 ℃.
And B, quenching time in the step B is 30min, primary cooling is water cooling, and secondary cooling is oil cooling.
And the tempering temperature in the step C is 500 ℃, and the treatment time is 30 min.
The surface treatment in step S6 specifically includes the following steps:
a) soaking the bolt in hydrochloric acid, taking out after a period of time, and cleaning with clear water;
b) immersing the bolt in the treating liquid, taking out after a period of time, washing with clear water, and drying in an oven.
The soaking time in the step a) is 5min, the treatment temperature in the step b) is 70 ℃, the soaking time is 3min, and the treatment liquid is a mixed solution of zinc dihydrogen phosphate, zinc nitrate and sodium carbonate.
Example two:
the difference from the first embodiment is that:
the blank comprises the following components in parts by weight: 3 parts of C, 2 parts of Si, 7 parts of Mn, 0.1 part of P, 0.3 part of S, 7 parts of Cr, 2.5 parts of Mo, 1 part of V, 0.5 part of W and 135 parts of Fe.
And the normalizing treatment temperature in the step A is 930 ℃, and the treatment time is 70 min.
The quenching time in the step B is 35 min.
And the tempering temperature in the step C is 520 ℃, and the treatment time is 35 min.
The soaking time in the step a) is 8min, the treatment temperature in the step b) is 80 ℃, and the soaking time is 4 min.
Example three:
the difference from the first embodiment is that:
the blank comprises the following components in parts by weight: 5 parts of C, 3 parts of Si, 10 parts of Mn, 0.5 part of P, 0.5 part of S, 10 parts of Cr, 3 parts of Mo, 1.5 parts of V, 1 part of W and 150 parts of Fe.
And the normalizing treatment temperature in the step A is 950 ℃, and the treatment time is 80 min.
The quenching time in the step B is 40 min.
The tempering temperature in the step C is 530 ℃, and the treatment time is 40 min.
The soaking time in the step a) is 10min, the treatment temperature in the step b) is 90 ℃, and the soaking time is 5 min.
Test example
The bolts prepared in the embodiments of the invention are respectively selected, the mechanical properties of the bolts are tested, and the test results are as follows:
as can be seen from the above table, the bolt prepared by the invention has excellent mechanical properties and high strength.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (8)
1. The outer hexagonal cross bolt machining process is characterized by comprising the following steps of:
s1, selecting blanks, preparing the blanks according to the design, and selecting the blanks with proper specifications;
s2, carrying out acid washing treatment on the blank;
s3, performing multi-station cold heading forming on the blank by using cold heading equipment, and forming a bolt head and a screw rod through a die;
s4, performing heat treatment on the bolt;
s5, processing threads on the surface of the bolt by using a thread rolling machine;
s6, performing surface treatment on the bolt;
and S7, carrying out flaw detection to obtain a finished product.
2. The outer hexagonal cross bolt machining process according to claim 1, wherein the blank comprises the following components in parts by weight: 2-5 parts of C, 1-3 parts of Si, 5-10 parts of Mn, 0.03-0.5 part of P, 0.01-0.5 part of S, 5-10 parts of Cr, 2-3 parts of Mo, 0.5-1.5 parts of V, 0.1-1 part of W and 120-150 parts of Fe.
3. The outer hexagonal cross bolt machining process according to claim 2, wherein the heat treatment in the step S4 specifically includes the steps of:
A. putting the bolt into a normalizing furnace for normalizing treatment, and then taking out and putting the bolt into fine sand for cooling;
B. putting the bolt into a quenching furnace for quenching treatment, and then sequentially carrying out primary cooling treatment and secondary cooling treatment;
C. and (4) putting the bolt into a tempering furnace for tempering treatment, and then putting the bolt into air for natural cooling.
4. The process as claimed in claim 3, wherein the normalizing temperature in step A is 900-950 ℃, the treating time is 60-80min, and the cooling is performed to 500 ℃.
5. The processing technology of an outer hexagonal cross bolt according to claim 4, wherein the quenching time in the step B is 30-40min, the primary cooling is water cooling, and the secondary cooling is oil cooling.
6. The process as claimed in claim 5, wherein the tempering temperature in step C is 500-530 ℃ and the treatment time is 30-40 min.
7. The outer hexagonal cross bolt machining process according to claim 6, wherein the surface treatment in the step S6 specifically includes the steps of:
a) soaking the bolt in hydrochloric acid, taking out after a period of time, and cleaning with clear water;
b) immersing the bolt in the treating liquid, taking out after a period of time, washing with clear water, and drying in an oven.
8. The processing technology of an outer hexagonal cross bolt according to claim 7, wherein the soaking time in the step a) is 5-10min, the treatment temperature in the step b) is 70-90 ℃, the soaking time is 3-5min, and the treatment liquid is a mixed solution of zinc dihydrogen phosphate, zinc nitrate and sodium carbonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010747107.8A CN111842774A (en) | 2020-07-29 | 2020-07-29 | Outer hexagonal cross bolt machining process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010747107.8A CN111842774A (en) | 2020-07-29 | 2020-07-29 | Outer hexagonal cross bolt machining process |
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| Publication Number | Publication Date |
|---|---|
| CN111842774A true CN111842774A (en) | 2020-10-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010747107.8A Pending CN111842774A (en) | 2020-07-29 | 2020-07-29 | Outer hexagonal cross bolt machining process |
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| CN (1) | CN111842774A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115094337A (en) * | 2022-07-22 | 2022-09-23 | 上海大学(浙江)高端装备基础件材料研究院 | Ultrahigh-strength alloy steel, 19.8-grade threaded fastener and preparation method thereof |
| CN115198190A (en) * | 2022-07-22 | 2022-10-18 | 上海大学 | Ultrahigh-strength alloy steel, 17.8-grade threaded fastener and preparation method thereof |
| CN115233101A (en) * | 2022-07-22 | 2022-10-25 | 上海大学(浙江)高端装备基础件材料研究院 | Ultrahigh-strength alloy steel, 18.8-grade threaded fastener and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000317738A (en) * | 1999-05-10 | 2000-11-21 | Hamanaka Nut Kk | Manufacture of stainless steel bolt |
| CN1443946A (en) * | 2003-04-17 | 2003-09-24 | 南京汽车集团有限公司 | Production process of high strength bolt with above 1300MPa |
| CN102851479A (en) * | 2011-06-29 | 2013-01-02 | 徐州市瑞达高强度紧固件厂 | Heat treatment technology of high-strength bolt |
| CN103088268A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Preparation method of fastening bolt for automobile wheel |
| CN105907938A (en) * | 2016-05-05 | 2016-08-31 | 太仓小小精密模具有限公司 | Heat treatment technology of high-strength bolt |
| CN108213864A (en) * | 2017-12-19 | 2018-06-29 | 深圳航空标准件有限公司 | The method and its bolt of bolt processing |
-
2020
- 2020-07-29 CN CN202010747107.8A patent/CN111842774A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000317738A (en) * | 1999-05-10 | 2000-11-21 | Hamanaka Nut Kk | Manufacture of stainless steel bolt |
| CN1443946A (en) * | 2003-04-17 | 2003-09-24 | 南京汽车集团有限公司 | Production process of high strength bolt with above 1300MPa |
| CN102851479A (en) * | 2011-06-29 | 2013-01-02 | 徐州市瑞达高强度紧固件厂 | Heat treatment technology of high-strength bolt |
| CN103088268A (en) * | 2012-12-04 | 2013-05-08 | 安徽六方重联机械股份有限公司 | Preparation method of fastening bolt for automobile wheel |
| CN105907938A (en) * | 2016-05-05 | 2016-08-31 | 太仓小小精密模具有限公司 | Heat treatment technology of high-strength bolt |
| CN108213864A (en) * | 2017-12-19 | 2018-06-29 | 深圳航空标准件有限公司 | The method and its bolt of bolt processing |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115094337A (en) * | 2022-07-22 | 2022-09-23 | 上海大学(浙江)高端装备基础件材料研究院 | Ultrahigh-strength alloy steel, 19.8-grade threaded fastener and preparation method thereof |
| CN115198190A (en) * | 2022-07-22 | 2022-10-18 | 上海大学 | Ultrahigh-strength alloy steel, 17.8-grade threaded fastener and preparation method thereof |
| CN115233101A (en) * | 2022-07-22 | 2022-10-25 | 上海大学(浙江)高端装备基础件材料研究院 | Ultrahigh-strength alloy steel, 18.8-grade threaded fastener and preparation method thereof |
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Application publication date: 20201030 |