CN101927301B - Cold compression necking process of reducing short tube - Google Patents
Cold compression necking process of reducing short tube Download PDFInfo
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- CN101927301B CN101927301B CN2010102553491A CN201010255349A CN101927301B CN 101927301 B CN101927301 B CN 101927301B CN 2010102553491 A CN2010102553491 A CN 2010102553491A CN 201010255349 A CN201010255349 A CN 201010255349A CN 101927301 B CN101927301 B CN 101927301B
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Abstract
The invention relates to a cold compression necking process of a reducing short tube. The cold compression necking process is characterized in that a mould for the necking process comprises an outer mould and a core mould, wherein the inner wall of the outer mould is in an abnormal round tube shape and comprises a straight tube section and a flared cambered surface tube section; the core mould is in a circular truncated cone shape; and horizontal support plates are equidistantly arranged on the edge of the upper circumferential surface of the core mould according to the circumference. The necking process comprises the following steps of: placing the core mould in the outer mould; supporting the horizontal support plate on the edge of the outer mould; fixing the outer mould with an oil cylinder of a hydraulic machine; placing a metal round tube below the mould; starting the hydraulic machine to downwards press the outer mould; extruding the metal round tube by the outer mould to ensure the metal round tube to start reducing and necking; and when the length of the straight section achieves the design requirement, stopping downward press by the hydraulic machine and then withdrawing the mould. In the invention, a cold compression forming technology is applied. The invention has the advantages of simple and practicable process, energy source saving, accurate necking, high precision and favorable forming performance.
Description
Technical field
The present invention relates to a kind of cold compression necking process of reducing short tube, belong to metal tube reducing manufacture field.
Background technology
The reducing short tube is used very extensive in reality, and the reducing short tube all is to adopt straight tube to process through reducing.At present, the metal circular tube diameter reducing working method mainly contains two kinds: a kind of is the spinning closing-in method, and another kind is the shaping mould extrusion.No matter adopt which kind of reducing method, after the reducing, the precision of the osculum diameter of metal circular tube is difficult to all guarantee that especially after the large-diameter steel pipe reducing, osculum side pipe mouth diameter and moulding all are difficult to meet design requirement that ratio defective product is low.For quality and the product qualified rate that improves reducing, there is the people in the reducing mould, also to embed electrically heated rod, be used for heating the reducing pipeline section, the thrust when reducing reducing.But heating-up temperature is wayward, is difficult to control osculum duct wall thickness, nozzle diameter and moulding equally, and wastes energy.
Summary of the invention
The purpose of this invention is to provide a kind of cold compression necking process of reducing short tube that utilizes simple mold to accomplish diameter-variable nozzle stub throat, this features simple and practical process need not heating in the reducing process, be cold moudling fully, and reducing is accurate, precision is high, forming.
The objective of the invention is to realize by following mode:
The used mold of necking down process of the present invention comprises cover tire and core tire; The inwall of cover tire is special-shaped pipe shape; The inwall of cover tire is made up of the cambered surface pipeline section of straight length and enlarging; The length of straight length is not less than the design length of the osculum mouth end straight length behind the diameter-variable nozzle stub throat, and the changeover portion between big opening end straight tube behind cambered surface pipeline section and the diameter-variable nozzle stub throat and osculum end straight tube matches; The core tire is a truncated cone-shaped, and circular diameter is 100～101: 99 with the ratio of following circular diameter on it, and the edge of disc is equipped with horizontal supporting plate by circumference is equidistant on the core tire; The core tire is put into cover tire, the edge of its horizontal supporting plate holder outer tyre, and make core tire and cover tire concentric, cover tire and hydraulic press cylinder rod are fixed; Metal circular tube is put into the mold below, and the center of metal circular tube and the center of cover tire align, and the primer fluid press presses to cover tire on the metal circular tube, and the core tire is moved down with cover tire by the self gravitation effect synchronously; Hydraulic press continues to press down, and metal circular tube is by the reducing of cover tire extruding beginning reducing, and when the inwall of metal circular tube contacted with the core tire, the core tire stopped to move down; And cover tire continues to move down under the hydraulic press effect, and this moment, the inwall and the core tire contact-making surface of metal circular tube necking end increased the formation straight section gradually, when the length of straight section reaches designing requirement; Hydraulic press stops to press down, and promotes the hydraulic press cylinder rod then, and cover tire is pulled upwardly; Lift after plate contacts with the core fetal fluids when the cover tire upper surface, the core tire also upwards rises, and metal circular tube also is raised simultaneously; From mold shake metal circular tube go out with hammer this moment, accomplishes and move back tire, and diameter-variable nozzle stub throat finishes.
Advantage of the present invention is: features simple and practical process, adopt the cold moudling technology, and save the energy, reducing is accurate, precision is high, forming.
Description of drawings
Fig. 1 is the sketch map at necking down process initial stage of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the necking down process of the present invention sketch map in mid-term;
Fig. 4 is the sketch map that necking down process of the present invention moves back the tire stage.
The specific embodiment
Embodiment:
Reducing short tube with 720 millimeters of round steel pipe reducing to the diameters of 773 millimeters of diameters, 12 millimeters of wall thickness, 650 millimeters of length.
At first prepare mold; The inwall of cover tire 1 is special-shaped pipe shape; The inwall of cover tire is made up of the cambered surface pipeline section of straight length and enlarging, and the length of straight length is not less than the design length of the osculum mouth end straight length behind the diameter-variable nozzle stub throat, the internal diameter of straight length greater than the round steel pipe reducing after the external diameter of necking end; The difference of the external diameter of itself and necking end is less than the design tolerance of necking end external diameter, and the changeover portion between big opening end straight tube behind cambered surface pipeline section and the diameter-variable nozzle stub throat and osculum end straight tube matches; Core tire 2 is a truncated cone-shaped; Circular diameter is 100～101: 99 with the ratio of following circular diameter on it; The internal diameter of circular diameter after on it smaller or equal to the moulding of round steel pipe necking end; The difference of the internal diameter after itself and the necking end moulding is less than the design tolerance of necking end internal diameter, and the edge of disc is equipped with horizontal supporting plate 3 by circumference is equidistant on the core tire; Then, the core tire is put into cover tire, the edge of its horizontal supporting plate holder outer tyre, and make core tire and cover tire concentric; Cover tire and hydraulic press cylinder rod are fixed, metal circular tube 4 is put into the mold below, the center of metal circular tube and the center of cover tire align; The primer fluid press presses to cover tire on the metal circular tube, and the core tire moves down (like Fig. 1, shown in Figure 2) by the self gravitation effect with cover tire synchronously, and hydraulic press continues to press down; Metal circular tube is by the reducing of cover tire extruding beginning reducing, and when the inwall of metal circular tube contacted with the core tire, the core tire stopped to move down; And cover tire continues to move down under the hydraulic press effect, and this moment, the inwall and the core tire contact-making surface of metal circular tube necking end increased formation straight section (as shown in Figure 3) gradually, when the length of straight section reaches designing requirement; Hydraulic press stops to press down, and promotes the hydraulic press cylinder rod then, and cover tire is pulled upwardly; Lift after plate contacts with the core fetal fluids when the cover tire upper surface, the core tire also upwards rises, and metal circular tube also is raised simultaneously; From mold shake metal circular tube go out with hammer this moment, accomplishes and move back tire (as shown in Figure 4), and diameter-variable nozzle stub throat finishes.
Claims (1)
1. cold compression necking process of reducing short tube; It is characterized in that: the used mold of necking down process comprises cover tire and core tire; The inwall of cover tire is special-shaped pipe shape; The inwall of cover tire is made up of the cambered surface pipeline section of straight length and enlarging, and the length of straight length is not less than the design length of the osculum mouth end straight length behind the diameter-variable nozzle stub throat, and the changeover portion between big opening end straight tube behind cambered surface pipeline section and the diameter-variable nozzle stub throat and osculum end straight tube matches; The core tire is a truncated cone-shaped, and circular diameter is 100～101: 99 with the ratio of following circular diameter on it, and the edge of disc is equipped with horizontal supporting plate by circumference is equidistant on the core tire; The core tire is put into cover tire, the edge of its horizontal supporting plate holder outer tyre, and make core tire and cover tire concentric, cover tire and hydraulic press cylinder rod are fixed; Metal circular tube is put into the mold below, and the center of metal circular tube and the center of cover tire align, and the primer fluid press presses to cover tire on the metal circular tube, and the core tire is moved down with cover tire by the self gravitation effect synchronously; Hydraulic press continues to press down, and metal circular tube is by the reducing of cover tire extruding beginning reducing, and when the inwall of metal circular tube contacted with the core tire, the core tire stopped to move down; And cover tire continues to move down under the hydraulic press effect, and this moment, the inwall and the core tire contact-making surface of metal circular tube necking end increased the formation straight section gradually, when the length of straight section reaches designing requirement; Hydraulic press stops to press down, and promotes the hydraulic press cylinder rod then, and cover tire is pulled upwardly; Lift after plate contacts with the core fetal fluids when the cover tire upper surface, the core tire also upwards rises, and metal circular tube also is raised simultaneously; From mold shake metal circular tube go out with hammer this moment, accomplishes and move back tire, and diameter-variable nozzle stub throat finishes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102553491A CN101927301B (en) | 2010-08-10 | 2010-08-10 | Cold compression necking process of reducing short tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102553491A CN101927301B (en) | 2010-08-10 | 2010-08-10 | Cold compression necking process of reducing short tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101927301A CN101927301A (en) | 2010-12-29 |
| CN101927301B true CN101927301B (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102553491A Active CN101927301B (en) | 2010-08-10 | 2010-08-10 | Cold compression necking process of reducing short tube |
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| CN (1) | CN101927301B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107695621A (en) * | 2017-09-14 | 2018-02-16 | 宁国昕远金属制品有限公司 | A kind of inner metal sleeve processing method |
| CN108405739A (en) * | 2018-04-09 | 2018-08-17 | 南京坚固高中压阀门制造有限公司 | A kind of high and middle pressure valve valve body disposal molding mold |
| CN109304404A (en) * | 2018-10-31 | 2019-02-05 | 阮佳慧 | A kind of steel pipe throat machine with feeding structure |
| CN111299979B (en) * | 2020-03-24 | 2021-11-23 | 重庆志齐机械制造有限公司 | Preparation process of cold extrusion piston tube |
| CN112427559B (en) * | 2020-10-22 | 2022-09-16 | 浙江美联智能科技有限公司 | Method for forming ingot cover of covered spindle |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0459142A (en) * | 1990-06-27 | 1992-02-26 | Masanobu Nakamura | Method for reducing diameter of tube stock |
| CN2136084Y (en) * | 1992-09-29 | 1993-06-16 | 第一汽车制造厂工艺处 | Floating arbor type precision diameter reducing mould for thin-walled tube |
| CN100434205C (en) * | 2004-11-29 | 2008-11-19 | 李嘉豪 | Method and its device for forming heat pipe shrinking pipe |
| CN1927498A (en) * | 2006-08-30 | 2007-03-14 | 赵铎 | Radius variation and mouth reducing method for radius-variable short tube |
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2010
- 2010-08-10 CN CN2010102553491A patent/CN101927301B/en active Active
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| CN101927301A (en) | 2010-12-29 |
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Owner name: BAOTOU XUNDA HEATING EQUIPMENT CO., LTD. Free format text: FORMER OWNER: ZHAO DUO Effective date: 20140409 |
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Effective date of registration: 20140409 Address after: 014030, the Inner Mongolia Autonomous Region, Baotou rare earth hi tech Zone, happy South Road, No. 1 neighborhood Patentee after: Baotou Schindler heating equipment Co., Ltd. Address before: 014030 No. 7, block 14, 9 prosperous road, Qingshan District, the Inner Mongolia Autonomous Region, Baotou Patentee before: Zhao Duo |