CN101698195A - Hollow core rod used for planetary rolling mill - Google Patents

Hollow core rod used for planetary rolling mill Download PDF

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Publication number
CN101698195A
CN101698195A CN200910213179A CN200910213179A CN101698195A CN 101698195 A CN101698195 A CN 101698195A CN 200910213179 A CN200910213179 A CN 200910213179A CN 200910213179 A CN200910213179 A CN 200910213179A CN 101698195 A CN101698195 A CN 101698195A
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CN
China
Prior art keywords
rod
barred
hollow core
core rod
rolling mill
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Granted
Application number
CN200910213179A
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Chinese (zh)
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CN101698195B (en
Inventor
曹胤
浦益龙
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.)
Jiangsu Longda Super Alloy Co.,Ltd.
Original Assignee
WUXI LONGDA METAL MATERIAL CO Ltd
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Priority to CN2009102131798A priority Critical patent/CN101698195B/en
Publication of CN101698195A publication Critical patent/CN101698195A/en
Application granted granted Critical
Publication of CN101698195B publication Critical patent/CN101698195B/en
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Abstract

The invention relates to an improvement method of a core rod of a metal rolled tube, in particular to a hollow core rod used for a planetary rolling mill. According to the technical scheme provided in the invention, the hollow core rod used for the planetary rolling mill comprises a rod body, a screw thread section positioned at the left end of the rod body and a conical section positioned at the right end of the rod body. The invention is characterized in that the rod body is also in a conical shape, thus ensuring that the left end of the rod body is greater than the right end of the rod body; through-holes which are communicated with each other and are arranged on the same axial line are arranged in the rod body, the screw thread section and the conical section; two planes are arranged on the outer surface close to the screw thread section on the rod body, and the two planes are in parallel and are symmetrical to the axial line of the rod body; the conical degree of the rod body is 150:0.08; the material quality of the hollow core rod is H13; and the hardness of the hollow core rod is HRC53-55. The invention can improve the comprehensive yield, labor productivity of tubing and the level of product quality.

Description

Hollow core rod used for planetary rolling mill
Technical field
The plug that the present invention relates to a kind of metal rolled pipe is improved one's methods, specifically a kind of hollow core rod used for planetary rolling mill.
Background technology
The plug mould of planetary rolling tube rolling use both at home and abroad is real core manufacturing at present, its material: domestic is 3Cr2W8V, heat treatment hardness: HRC45~50, must change in 3~5 tons of service lifes, through 2~4 of service lifes after the reconditioning, plug low reason in service life: be that milling train is when high-speed rolling pipe (∮ 88*24 → ∮ 48*2.2) by analysis, be warming up to 750~850 ℃ by aximal deformation value (percentage elongation 15.24) is instantaneous, use under the condition of high temperature (30 minutes) for a long time, mandrel surface hardness is progressively descending, until oneself has annular trace ditch to HRC36~38 o'clock mandrel surface; As continue to roll down, pipe material inner wall just has spirality and draws trace, and back road stretching tube wall thickness 〉=0.5 is difficult to eliminate this and draws trace, and air conditioner industry requires high to inwall with copper pipe, have to change plug for guaranteeing product quality, has not only increased production cost but also wasted tubing.
Summary of the invention
The objective of the invention is to design a kind of hollow core rod used for planetary rolling mill, to improve the class of tubing integrated yield, labor productivity and product quality.
According to technical scheme provided by the invention, described hollow core rod used for planetary rolling mill, thread segment that comprises barred body and be positioned at the barred body left end and the conical section that is positioned at the barred body right-hand member, it is characterized in that: described barred body is also tapered, makes the right-hand member of the left end of barred body greater than barred body.
The through hole that is interconnected and is positioned at same axis all is set in described barred body, thread segment and conical section.On barred body, two planes are set, and two planes are parallel to each other, and are symmetrical in the axis of barred body near the outer surface of thread segment.The tapering of described barred body is 150: 0.08.The material of described hollow rod is H13, and the hardness of hollow rod is HRC53~55.
Advantage of the present invention is: at first the material with plug changes H13 into, is characterized in that heat treatment hardness can be improved to HRC53~55; Secondly processed tapering 150: 0.08 toward the discharging direction on plug, purpose is to reduce roll-force and thrust.Then at plug ∮ 36 centre drill ∮ 8 through holes, when rolling, connect hollow stem and enter nitrogen cooling plug from afterbody by plug, purpose is to make plug under the high-speed and high-temperature state during drawn and rolled tube, and it is controlled that mandrel surface hardness is descended, and guarantees that rolling pipe material inner wall is bright and clean.
Description of drawings
Fig. 1 is a structure chart of the present invention.
Fig. 2 is the A-A view of Fig. 1.
The specific embodiment
Hollow core rod used for planetary rolling mill comprises barred body 3 and is positioned at the thread segment 1 and the conical section 4 that is positioned at barred body 3 right-hand members of barred body 3 left ends that described barred body 3 is also tapered, makes the right-hand member of the left end of barred body 3 greater than barred body 3.
The through hole 2 that is interconnected and is positioned at same axis all is set in described barred body 3, thread segment 1 and conical section 4.On barred body 3, two planes 5 are set, and two planes 5 are parallel to each other, and are symmetrical in the axis of barred body 3 near the outer surface of thread segment 1.
The tapering of described barred body 3 is 150: 0.08.The material of described hollow rod is H13, and the hardness of hollow rod is HRC53~55.
By above-mentioned process innovation, obtained large increase the service life of a present plug, every plug once can be rolling 8~10 tons, and recycling can reach 4 times, pipe material inner wall does not have the trace of drawing, and product quality is guaranteed, for follow-up drawing process is created good basis.

Claims (5)

1. hollow core rod used for planetary rolling mill comprises barred body (3) and is positioned at the thread segment (1) and the conical section (4) that is positioned at barred body (3) right-hand member of barred body (3) left end that it is characterized in that: described barred body (3) is also tapered, makes the right-hand member of the left end of barred body (3) greater than barred body (3).
2. hollow core rod used for planetary rolling mill as claimed in claim 1 is characterized in that: the through hole (2) that is interconnected and is positioned at same axis all is set in described barred body (3), thread segment (1) and conical section (4).
3. hollow core rod used for planetary rolling mill as claimed in claim 1 is characterized in that: the outer surface of going up near thread segment (1) at barred body (3) is provided with two planes (5), and two planes (5) are parallel to each other, and is symmetrical in the axis of barred body (3).
4. hollow core rod used for planetary rolling mill as claimed in claim 1 is characterized in that: the tapering of described barred body (3) is 150: 0.08.
5. hollow core rod used for planetary rolling mill as claimed in claim 1 is characterized in that: the material of described hollow rod is H13, and the hardness of hollow rod is HRC53~55.
CN2009102131798A 2009-10-20 2009-10-20 Hollow core rod used for planetary rolling mill Active CN101698195B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009102131798A CN101698195B (en) 2009-10-20 2009-10-20 Hollow core rod used for planetary rolling mill

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009102131798A CN101698195B (en) 2009-10-20 2009-10-20 Hollow core rod used for planetary rolling mill

Publications (2)

Publication Number Publication Date
CN101698195A true CN101698195A (en) 2010-04-28
CN101698195B CN101698195B (en) 2012-02-01

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009102131798A Active CN101698195B (en) 2009-10-20 2009-10-20 Hollow core rod used for planetary rolling mill

Country Status (1)

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CN (1) CN101698195B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103801559A (en) * 2012-11-08 2014-05-21 青岛宏泰铜业有限公司 Rolled tube mandril manufacturing method and device for rolling rolled tube mandril
CN104227350A (en) * 2014-09-02 2014-12-24 中原特钢股份有限公司 Preparing method of retained mandrel
CN106391716A (en) * 2016-11-18 2017-02-15 广东龙丰精密铜管有限公司 Hollow mandrel of planetary rolling copper pipe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103801559A (en) * 2012-11-08 2014-05-21 青岛宏泰铜业有限公司 Rolled tube mandril manufacturing method and device for rolling rolled tube mandril
CN104227350A (en) * 2014-09-02 2014-12-24 中原特钢股份有限公司 Preparing method of retained mandrel
CN106391716A (en) * 2016-11-18 2017-02-15 广东龙丰精密铜管有限公司 Hollow mandrel of planetary rolling copper pipe

Also Published As

Publication number Publication date
CN101698195B (en) 2012-02-01

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Address after: 214105 No.18 Xiangyun Road, anzhen street, Xishan District, Wuxi City, Jiangsu Province

Patentee after: Jiangsu Longda Super Alloy Co.,Ltd.

Address before: 214105 Wuxi Longda metal material Co., Ltd., anzhen street, Xishan District, Wuxi City, Jiangsu Province

Patentee before: WUXI LONGDA METAL MATERIALS Co.,Ltd.