CN202162225U - Mould structure for cold-drawing high-precision thick-walled pipe - Google Patents
Mould structure for cold-drawing high-precision thick-walled pipe Download PDFInfo
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- CN202162225U CN202162225U CN2011200812398U CN201120081239U CN202162225U CN 202162225 U CN202162225 U CN 202162225U CN 2011200812398 U CN2011200812398 U CN 2011200812398U CN 201120081239 U CN201120081239 U CN 201120081239U CN 202162225 U CN202162225 U CN 202162225U
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Abstract
The utility model relates to a tooling mould for machining, in particular to a tooling mould which is processed into a small-diameter circular pipe by round steel. A mound structure for a cold-drawing high-precision thick-walled pipe is characterized in that the round steel after being broken and drilled is processed by the following steps of, 1, carrying out cold-rolling processing on a pipe mill and ensuring that the elongation percentage is 1.6-2.2; 2, annealing, head-driving, pickling and phosphating and saponifying under the anaerobic condition; and 3, carrying out cold-rolling processing on a cold-drawing machine and ensuring that the elongation percentage is 1.5-1.7, wherein a cone apex angle (Beta) at a conical wall reduction section of an outer mould is 22-28 DEG, a cone apex angle (Alpha) of an inner mould is 16-22 DEG, and the length of a fixed-wall section of the inner mould is prolonged by 8-14 %. The mould structure is combined based on the prior machining process and provides special process parameters and requirements, therefore, the mould structure is easy to implement and realizes the technical level that the batch processing and production can not be carried out by means of a conventional means in the field, and the processing precision level can achieve the domestic and foreign highest level in the field.
Description
Technical field
The utility model is a kind of moulds of industrial equipment of machining, particularly relates to a kind of moulds of industrial equipment that are processed into the minor diameter pipe by round steel.
Background technology
Known, so-called cold reduction of tubes cold-drawn be on cold rolling drawn tube unit at room temperature with rolling and drawing mode to the cold working that tubing carries out, belong to the deep processing of hot-rolled pipe (tubing that comprises hot extrusion) and welded pipe.It can obtain, and diameter is littler, wall thickness is thinner, dimensional accuracy is higher, surface roughness is lower and performance is better and the tubing of multiple section configuration.Can produce the various tubing of diameter 0.2～765mm and wall thickness 0.015～50mm with cold-drawing process.Can produce the various tubing of diameter 4～450mm and wall thickness 0.03～35mm with cold-rolling practice.
Cold-drawn is compared with cold rolling, and cold rolling advantage is that pass deformation is big, and passes is few, and is with short production cycle little with metal consumption.Shortcoming is difficulty of instrument manufacturing, and the change specification is inconvenient.The production very flexible, equipment investment is high and safeguard complicated; Owing to be pepriodic rolling, rolling time is long, and productivity is lower, and energy consumption is high.The advantage of cold-drawn is that productivity is higher, and it is more convenient to become specification in the production, and flexibility is big, and equipment and instrument manufacturing are simple; Shortcoming is that pass deformation is little, and passes is many, and the production cycle is long, and metal consumption is big.
The processing technology of thick-walled pipe particularly relates to and a kind ofly is processed into the technology that shapes of minor diameter thick walled steel tube by seamless major-diameter thick-wall steel pipe, generally is to be that to be processed into diameter be the minor diameter pipe about 30mm for the seamless major-diameter thick-wall pipe of 60～62mm by diameter; Perhaps the large diameter pipe by 30～40mm is processed into the seamless minor diameter pipe that diameter is 8～12mm, and present processing mode is to select for use cold pilger mill to carry out cold roll forming processing; Perhaps being employed on the drawbench mode of cold-drawn and processing, wherein is that the pipe machining accuracy that adopts cold rolling mode to process will be higher than the cold-drawn mode, generally can reach about ± 0.25mm; The highest at present can reaching ± 0.16mm; Yet, along with science and technology development, along with the raising of precision processing technology; In some space flight, military project or the like field; Hope to continue to improve the precision that shapes of seamless steel pipe, existing processing mode, the machining accuracy level can not satisfy the needs to product.
Summary of the invention
The utility model provides a kind of moulds of industrial equipment of processing of high accuracy heavy wall pipe, reaches to improve the machining accuracy that pipe is shaped, and the purpose of the utility model is realized by following technical scheme.
The effective mould structure of a kind of cold-drawn high accuracy heavy wall, round steel is characterized in that in the cold-drawn processing after fracture, boring, cold rolling processing, anaerobic annealing:
Conical wall-reducting section external mold cone-apex angle at the external mold of drawbench cold-drawn is 22～28 degree, and the internal mold cone-apex angle of internal mold is 16～22 degree.
Further, cold-drawn processing percentage elongation is 1.5～1.7.
Further, cold-drawn processing percentage elongation is 1.693.
Specific operation process is: round steel behind fracture, drilling operating,
(1) on pipe mill, carry out cold rolling processing, percentage elongation is 1.6～2.2;
(2) annealing under oxygen free condition, and take the lead, acid washing phosphorization, saponification;
(3) on drawbench, carry out cold-drawn processing, percentage elongation is 1.5～1.7, and wherein the conical wall-reducting section external mold cone-apex angle of external mold is 22～28 degree, and the internal mold cone-apex angle of internal mold is 16～22 degree, and internal mold is decided the more conventional mould lengthening 8～14% of wall segment length.
Annealing can be carried out the non-oxidation annealing in process under the said oxygen free condition in electric furnace.
In order to improve the machining accuracy that pipe is shaped, adopt above-mentioned processing technology, 1. cold rolling and processing percentage elongation cold-drawn must be controlled in certain scope, otherwise can influence surface roughness and the forming accuracy after the distortion.2. anaerobic annealing is adopted in intermediate annealing; Can guarantee the inside and outside wall non-oxidation of steel pipe layer, guarantee the cleannes of steel pipe, make that the acid washing phosphorization of the middle operation of steel pipe is more fully thorough; Guarantee follow-up inner and outer pipes lubricating in process of tube plug drawing mill, steel tube surface obtains high fineness.The process of structure undergauge drawing deformation lengthening thus changes gentlyer, makes that the tube wall precision of processing is higher, can reach ± 0.10mm in.
The superior effect of the utility model: the utility model makes up on the basis of conventional processing technology; Some special technological parameter and requirements have been increased; Therefore, the utility model is implemented easily, and has realized that this area so far only relies on the technical merit that conventional means can't batch machining production high accuracy heavy wall pipe; The machining accuracy energy level has reached highest level both domestic and external, in the sophisticated technology field extremely important using value is arranged.
Description of drawings
Fig. 1 is the structural representation of internal mold mould in the processing technology of the utility model high accuracy heavy wall pipe, has shown that internal mold decides the wall segment length;
Fig. 2 is internal mold in the processing technology of the utility model high accuracy heavy wall pipe, external mold and thick-walled pipe three's a configuration structure sketch map.
Among the figure, the 1st, external mold, the 2nd, thick-walled pipe, the 3rd, internal mold, L are that internal mold is decided the wall segment length, α is that internal mold cone-apex angle, β are the external mold cone-apex angles.
The specific embodiment
Further specify the detailed content of the utility model below in conjunction with accompanying drawing.
A kind of processing technology of thick-walled pipe, round steel behind fracture, perforation process,
(1) carry out cold rolling processing on the pipe mill, percentage elongation is 1.6～2.2;
On pipe mill, carry out cold rolling processing, percentage elongation is 1.938, for the bigger Φ 30 * 10.5mm steel pipe of usual amounts; With the cold rolling processing of the round steel of Φ 60mm; Percentage elongation is 1.938 to be advisable, and the steel pipe after cold rolling is Φ 40 * 12.7mm, so that get into next step cold-drawn processing.
(2) annealing under oxygen free condition, and take the lead, acid washing phosphorization, saponification;
In electric furnace, carry out annealing in process, this is the anaerobic annealing device of a kind of most convenient, routine, guarantees the inside and outside wall non-oxidation of steel pipe layer, guarantees the fineness of steel pipe.
(3) on drawbench, carry out cold-drawn processing, percentage elongation is 1.5～1.7, and wherein the conical wall-reducting section cone-apex angle of external mold is 22～28 degree, and the internal mold cone-apex angle is 16～22 degree, and internal mold is decided the more conventional mould lengthening 8～14% of wall segment length.
On drawbench, carry out undergauge cold-drawn processing, percentage elongation is 1.693.Steel pipe after cold rolling is Φ 40 * 12.7mm, draw on the drawbench of external mold Φ 30 ± 0.02mm, internal mold Φ 9.0 ± 0.05mm, and percentage elongation is 1.693,
Finished product accuracy can reach the high accuracy of Φ 30 ± 0.10mm, wall thickness 10.5 ± 0.10mm after the cold-drawn.
Claims (3)
1. effective mould structure of cold-drawn high accuracy heavy wall is characterized in that:
The conical wall-reducting section external mold cone-apex angle (β) of the external mold of drawbench cold-drawn (1) is 22～28 degree, and the internal mold cone-apex angle (α) of internal mold (3) is 16～22 degree.
2. according to the effective mould structure of the said cold-drawn high accuracy of claim 1 heavy wall, it is characterized in that cold-drawn processing percentage elongation is 1.5～1.7.
3. according to the effective mould structure of the said cold-drawn high accuracy of claim 2 heavy wall, it is characterized in that cold-drawn processing percentage elongation is 1.693.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200812398U CN202162225U (en) | 2011-03-24 | 2011-03-24 | Mould structure for cold-drawing high-precision thick-walled pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200812398U CN202162225U (en) | 2011-03-24 | 2011-03-24 | Mould structure for cold-drawing high-precision thick-walled pipe |
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| Publication Number | Publication Date |
|---|---|
| CN202162225U true CN202162225U (en) | 2012-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200812398U Expired - Lifetime CN202162225U (en) | 2011-03-24 | 2011-03-24 | Mould structure for cold-drawing high-precision thick-walled pipe |
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| CN (1) | CN202162225U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103934304A (en) * | 2014-04-14 | 2014-07-23 | 重庆钢铁(集团)有限责任公司 | Forming method of precise high-temperature alloy pipe with small caliber and thick wall for aviation |
-
2011
- 2011-03-24 CN CN2011200812398U patent/CN202162225U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103934304A (en) * | 2014-04-14 | 2014-07-23 | 重庆钢铁(集团)有限责任公司 | Forming method of precise high-temperature alloy pipe with small caliber and thick wall for aviation |
| CN103934304B (en) * | 2014-04-14 | 2018-04-03 | 重庆钢铁(集团)有限责任公司 | A kind of forming method of the accurate small-diameter thick-walled high temperature alloy pipes of aviation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI FENGXIAN STEEL TUBE CO., LTD. Free format text: FORMER NAME: FENGXIAN STEEL TUBING MILL, SHANGHAI |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 201400, 858, five-star village, South Bridge Town, Shanghai, Fengxian District Patentee after: SHANGHAI FENGXIAN STEEL PIPE FACTORY Address before: 201400, 858, five-star village, South Bridge Town, Shanghai, Fengxian District Patentee before: Shanghai Fengxian District Steel Pipe Factory |
|
| CX01 | Expiry of patent term |
Granted publication date: 20120314 |
|
| CX01 | Expiry of patent term |