CN114733927A - Seamless steel pipe for 40CrB track pin bush - Google Patents
Seamless steel pipe for 40CrB track pin bush Download PDFInfo
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- CN114733927A CN114733927A CN202210420015.8A CN202210420015A CN114733927A CN 114733927 A CN114733927 A CN 114733927A CN 202210420015 A CN202210420015 A CN 202210420015A CN 114733927 A CN114733927 A CN 114733927A
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- Prior art keywords
- tube
- pipe
- 40crb
- steel pipe
- seamless steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
Abstract
The invention discloses a seamless steel tube for a 40CrB track pin bush and a preparation process thereof, wherein the preparation process comprises the following steps: the method comprises the following steps of tube blank re-inspection, tube blank feeding and heating, perforation, tube rolling, sizing, cooling, straightening, tube end cutting, physical and chemical tests, manual inspection and nondestructive inspection. The technology of the invention adopts the hot piercing-rolling process, the yield is high and reaches more than 95%, the production efficiency is greatly improved, and the yield is one item, and the hot piercing-rolling process adopts the technology of the invention and is more than the existing round bar drilling process, and each ton of track pin bushings use blanks phi 61+0.8 +0.2The multiplied by phi 35.5-37.5 multiplied by 148mm can save the cost by 2695 yuan, and the cost of each blank for the crawler pin sleeve can save 6.02 yuan.
Description
Technical Field
The invention relates to a seamless steel pipe, in particular to a seamless steel pipe for a 40CrB track pin bush, and belongs to the technical field of pin bushes on tracks of excavators and bulldozers of engineering machinery.
Background
In the prior art, phi 61 is commonly adopted when producing the track pin bush+0.8 +0.2And (4) drilling holes on round bars with the diameter of 148mm to manufacture the seamless steel pipe for the track pin bush.
However, the prior art adopts a drilling technology, the yield is low, which is only 64.78%, and the production efficiency is low.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a seamless steel tube for a 40CrB track pin bush.
In order to solve the problems, the invention adopts the following technical scheme: a seamless steel pipe for a 40CrB track pin bush is made of a 40CrB round pipe blank.
The yield of the seamless steel tube for the 40CrB track pin bush is 95 percent.
The following is a further optimization of the present invention to the above scheme: the manufacturing process of the seamless steel pipe for the track pin bush comprises the following steps:
(1) re-testing the tube blank, namely re-testing the cut tube blank according to the YB/T5221 and the technical conditions of the short tube blank;
(2) feeding and heating the tube blank
Feeding the tube blanks qualified by the secondary inspection into a stepping bottom furnace for heating;
(3) piercing of the hole
Perforating the solid tube blank by a perforating machine set;
(4) rolled pipe
Conveying the perforated hollow blank pipe to a pipe rolling mill set for rolling, wherein the specification of the rolled blank pipe is phi 75 multiplied by 12 mm;
(5) sizing
Feeding the rolled pierced billets into a sizing unit for sizing, micro-wall-increasing and extension rolling, wherein the specification of finished products after sizing is phi 61.5 multiplied by phi 36.5 multiplied by 12.5 mm;
(6) cooling the mixture
Sending the finished product pipe subjected to sizing to a cooling bed for natural cooling;
(7) straightening
Sending the naturally cooled steel pipe to a straightening machine for straightening;
(8) tube end cutting
Cutting the pipe end of the straightened steel pipe by using a pipe cutting machine;
(9) physical and chemical tests
According to the requirements of the seamless steel tube for the 40CrB track pin sleeve, the finished steel tube is subjected to low-power, hardness, grain size, decarburized layer, banded structure and Widmannstatten structure inspection;
(10) and manual inspection
According to the requirement of the seamless steel pipe for the 40CrB track pin sleeve, the inner and outer surfaces and the geometric dimension of the finished steel pipe are manually inspected;
(11) nondestructive inspection
And (3) carrying out nondestructive inspection on the finished steel pipe according to the requirement of the seamless steel pipe for the 40CrB track pin sleeve, carrying out eddy current inspection according to the requirement of GB/T7735, wherein the acceptance grade is E2H, and carrying out ultrasonic inspection according to the requirement of GB/T5777, wherein the acceptance grade is U2.
Further optimization: in the step (2), the soaking forging temperature of the tube blank in a stepping bottom furnace is 1160-1190 ℃, and the furnace time is more than or equal to 115 minutes.
The technology of the invention adopts the hot piercing-rolling process, the yield is high and reaches more than 95%, the production efficiency is greatly improved, and the yield is one item, and the hot piercing-rolling process adopts the technology of the invention and is more than the existing round bar drilling process, and each ton of track pin bushings use blanks phi 61+0.8 +0.2The multiplied by phi 35.5-37.5 multiplied by 148mm can save the cost by 2695 yuan, and the cost of each blank for the crawler pin sleeve can save 6.02 yuan.
The invention is further illustrated with reference to the following figures and examples.
Drawings
FIG. 1 is a process flow diagram of the present invention in an example;
Detailed Description
Example a seamless steel pipe for a 40CrB track pin bush was produced using a 40CrB round pipe blank, as shown in fig. 1.
The manufacturing process of the seamless steel tube for the 40CrB track pin bush comprises the following steps:
(1) re-testing the tube blank, namely re-testing the cut tube blank according to the YB/T5221 and the technical conditions of the short tube blank;
(2) feeding and heating the tube blank
Feeding a 40CrB phi 85 multiplied by 2000mm tube blank which is cut off according to a plan and qualified by a retest into a stepping bottom furnace for heating, wherein the soaking forging temperature is 1160-1190 ℃, and the time of the tube blank in the furnace is more than or equal to 115 minutes;
(3) piercing of the hole
The solid tube blank is penetrated into a hollow tube blank phi 88 multiplied by 11mm through a piercing machine set, and the technological parameters are as follows: the roller spacing is 75mm, the guide distance is 83mm, the diameter of the top is 60mm, the front extension of the top is 50mm, the pressing rate before the top is 5.06 percent, and the elongation coefficient is 2.09;
(4) rolled pipe
Conveying the perforated hollow shell to a tube rolling mill set for reducing diameter (the diameter reducing amount is 13 mm), increasing wall (the wall increasing amount is 1 mm) and performing extension rolling (the extension coefficient formed by the diameter reducing and the wall increasing is 1.12), wherein the specification of the rolled hollow shell is phi 75 multiplied by 12 mm;
(5) sizing
Feeding the rolled pierced billets into a sizing unit for sizing (the diameter reduction generated by sizing is 13.5 mm), micro-increasing the wall (the micro-increasing the wall amount is 0.5 mm), and elongation rolling (the elongation coefficient formed by sizing and micro-increasing the wall is 1.23), wherein the finished product specification after sizing is phi 61.5 multiplied by phi 36.5 multiplied by 12.5 mm;
(6) cooling the mixture
Sending the finished product pipe after sizing to a cooling bed for natural cooling (the finished product pipe can be transferred to a straightening process when cooled to 50-60 ℃);
(7) straightening
Sending the naturally cooled steel pipe to a straightening machine for straightening;
(8) tube end cutting
Cutting the end of the straightened steel pipe by a cutting machine to ensure that the end surface of the steel pipe meets the standard requirement;
(9) physical and chemical tests
According to the specific requirements of the seamless steel tube for the 40CrB track pin sleeve, the low-power (the seamless steel tube can not have the defects of segregation, shrinkage cavity, air bubble, crack, white point, intergranular crack and the like which are visible to the naked eye, so the low-power structure test is carried out on the seamless steel tube according to the GB/T226 standard), the hardness (the hardness of the surface and the core of the seamless steel tube is required to be less than or equal to HB252, and the hardness test is carried out on the seamless steel tube), the grain size (the grain size of the seamless steel tube is required to be more than or equal to 6 grades, and the grain size test is carried out on the seamless steel tube), decarburized layers (the depth of the inner decarburized layer and the depth of the outer decarburized layer of the seamless steel pipe are required to be less than or equal to 0.4mm, and the inner decarburized layer and the outer decarburized layer are required to be subjected to depth inspection), banded structures (the banded structure C series of the seamless steel pipe is required to be less than or equal to 2 grade, and the banded structure inspection is required to be performed according to the specification of a GB/T13299 rating diagram), Widmanschner structures (the seamless steel pipe is required to have no Widmanschner structures, and the Widmanschner structures are required to be performed according to the specification of GB/T13299) and other various inspections;
(10) and manual inspection
According to the specific requirements of the geometric dimension of the seamless steel pipe for the 40CrB track pin bush (the external diameter dimension and the precision requirement of the seamless steel pipe are phi 61)+0.8 +0.2The inner diameter size and the precision of the seamless steel tube are required,
Φ36.5±1.0) Carrying out manual inspection on the geometric dimension of the glass substrate;
(11) nondestructive inspection
In order to meet the specific requirements of the quality of the inner surface and the outer surface of the seamless steel tube for the 40CrB track pin bush (the inner surface and the outer surface of the seamless steel tube are smooth, cracks cannot exist, and defects such as scabs, inclusion, meat deficiency and the like which influence the use are avoided), nondestructive flaw detection is performed, eddy current flaw detection is performed according to the requirements of GB/T7735, the acceptance grade is E2H, ultrasonic flaw detection is performed according to the requirements of GB/T5777, and the acceptance grade is U2.
The invention utilizes the hot piercing and rolling technology to obtain the seamless steel tube (namely the blank for the track pin bushing) for the 40CrB track pin bushing instead of the prior phi 61+0.8 +0.2The drilling technology of the round bar stock with the length of 148mm improves the production efficiency, improves the yield and reduces the cost.
Claims (4)
1.40CrB track pin uses seamless steel pipe for cover, its characterized in that: it is made of 40CrB round tube blank.
2. The manufacturing process of the seamless steel tube for the pin bush of the 40CrB track as claimed in claim 1, is characterized in that: the yield thereof was 95%.
3. The manufacturing process of the seamless steel tube for the 40CrB track pin bush as claimed in claim 2, is characterized in that: the method comprises the following steps:
(1) re-testing the tube blank, namely re-testing the cut tube blank according to the YB/T5221 and the technical conditions of the short tube blank;
(2) feeding and heating the tube blank
Feeding the tube blanks qualified by the secondary inspection into a stepping bottom furnace for heating;
(3) piercing of the hole
Perforating the solid pipe blank by a pipe perforating machine set;
(4) rolled pipe
Conveying the perforated hollow blank pipe to a pipe rolling mill set for rolling, wherein the specification of the rolled blank pipe is phi 75 multiplied by 12 mm;
(5) sizing
Feeding the rolled pierced billets into a sizing unit for sizing, micro-wall-increasing and extension rolling, wherein the specification of finished products after sizing is phi 61.5 multiplied by phi 36.5 multiplied by 12.5 mm;
(6) cooling the mixture
Sending the finished product pipe subjected to sizing to a cooling bed for natural cooling;
(7) straightening
Sending the naturally cooled steel pipe to a straightening machine for straightening;
(8) tube end cutting
Cutting the pipe end of the straightened steel pipe by a cutting machine;
(9) physical and chemical tests
According to the requirements of the seamless steel pipe for the 40CrB track pin sleeve, the finished steel pipe is subjected to low-power, hardness, grain size, decarburized layer, banded structure and Widmannstatten structure inspection;
(10) and manual inspection
According to the requirement of the seamless steel pipe for the 40CrB track pin sleeve, the inner and outer surfaces and the geometric dimension of the finished steel pipe are manually inspected;
(11) nondestructive inspection
And (3) carrying out nondestructive inspection on the finished steel pipe according to the requirement of the seamless steel pipe for the 40CrB track pin sleeve, carrying out eddy current inspection according to the requirement of GB/T7735, wherein the acceptance grade is E2H, and carrying out ultrasonic inspection according to the requirement of GB/T5777, wherein the acceptance grade is U2.
4. The manufacturing process of the seamless steel tube for the 40CrB track pin bush as claimed in claim 3, is characterized in that: in the step (2), the soaking forging temperature of the tube blank in a stepping bottom furnace is 1160-1190 ℃, and the furnace time is more than or equal to 115 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210420015.8A CN114733927A (en) | 2022-04-21 | 2022-04-21 | Seamless steel pipe for 40CrB track pin bush |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210420015.8A CN114733927A (en) | 2022-04-21 | 2022-04-21 | Seamless steel pipe for 40CrB track pin bush |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114733927A true CN114733927A (en) | 2022-07-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210420015.8A Pending CN114733927A (en) | 2022-04-21 | 2022-04-21 | Seamless steel pipe for 40CrB track pin bush |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5681406A (en) * | 1993-09-15 | 1997-10-28 | Korea Atomic Energy Research Institute | Manufacturing method of delayed hydride cracking resistant seamless pressure tube made of zirconium (Zr) alloy |
| JP2007260705A (en) * | 2006-03-27 | 2007-10-11 | Sumitomo Metal Ind Ltd | Method for manufacturing seamless steel tube |
| CN101130197A (en) * | 2006-09-26 | 2008-02-27 | 李永立 | Cold drawing, cold rolling production method for high-accuracy weldless steel tube |
| CN101343714A (en) * | 2008-08-21 | 2009-01-14 | 攀钢集团成都钢铁有限责任公司 | 30CrMnSiB steel, weldless steel tube for cylinder and method of manufacturing the same |
| CN109604977A (en) * | 2019-02-21 | 2019-04-12 | 孙永宁 | A kind of manufacturing process of crawler belt guide |
| CN110743916A (en) * | 2019-10-22 | 2020-02-04 | 无锡隆达金属材料有限公司 | Oblique piercing method for bar for bearing |
| CN112474868A (en) * | 2020-10-20 | 2021-03-12 | 鑫鹏源(聊城)智能科技有限公司 | Hot rolling production process for rolling seamless tube with large diameter expansion |
-
2022
- 2022-04-21 CN CN202210420015.8A patent/CN114733927A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5681406A (en) * | 1993-09-15 | 1997-10-28 | Korea Atomic Energy Research Institute | Manufacturing method of delayed hydride cracking resistant seamless pressure tube made of zirconium (Zr) alloy |
| JP2007260705A (en) * | 2006-03-27 | 2007-10-11 | Sumitomo Metal Ind Ltd | Method for manufacturing seamless steel tube |
| CN101130197A (en) * | 2006-09-26 | 2008-02-27 | 李永立 | Cold drawing, cold rolling production method for high-accuracy weldless steel tube |
| CN101343714A (en) * | 2008-08-21 | 2009-01-14 | 攀钢集团成都钢铁有限责任公司 | 30CrMnSiB steel, weldless steel tube for cylinder and method of manufacturing the same |
| CN109604977A (en) * | 2019-02-21 | 2019-04-12 | 孙永宁 | A kind of manufacturing process of crawler belt guide |
| CN110743916A (en) * | 2019-10-22 | 2020-02-04 | 无锡隆达金属材料有限公司 | Oblique piercing method for bar for bearing |
| CN112474868A (en) * | 2020-10-20 | 2021-03-12 | 鑫鹏源(聊城)智能科技有限公司 | Hot rolling production process for rolling seamless tube with large diameter expansion |
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