CN201644534U - External mold assembly for cold-drawing tubular products - Google Patents
External mold assembly for cold-drawing tubular products Download PDFInfo
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- CN201644534U CN201644534U CN2010201763816U CN201020176381U CN201644534U CN 201644534 U CN201644534 U CN 201644534U CN 2010201763816 U CN2010201763816 U CN 2010201763816U CN 201020176381 U CN201020176381 U CN 201020176381U CN 201644534 U CN201644534 U CN 201644534U
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Abstract
The utility model relates to an external mold assembly for cold-drawing tubular products, comprising a mold base, the middle part of the mold base is provided with an axial external mold containing cavity, and a mold base outlet is arranged in front of the external mold containing cavity; the external mold assembly is characterized in that: a front mold and a rear mold are arranged in the external mold containing cavity, the pore diameter of a rear mold sizing area is more than that of a front mold sizing area, the rear mold transition angle of the rear mold transition region is more than the front mold transition angle of the front mold transition region; in the utility model, after a double external mold structure is adopted, empty sinking operation of steel pipes is carried out, the size change of the inner hole and the wall thickness of a target steel tube is controlled by the external mold, the phenomenon that the original tubular products are reduced rapidly is eliminated, and the problems that the target tubular product is easy to crack and has high bending degree are effectively solved when the cold-drawing tubular product process is strengthened, and the external mold assembly has the advantages of simple improved structure and not increasing the mold cost.
Description
[technical field]
The utility model belongs to a kind of external mould assembly for cold-drawing pipes.
[background technology]
At present, if desire obtains the seamless steel pipe of the littler and better quality of size, must adopt the method for cold rolling, cold-drawn or The combined.Cold-drawn refers in order to reach certain shape and certain mechanical property, carry out drawing and be at material under the condition of normal temperature, cold-drawn is carried out on the strand formula of 0.5～100T or double-chain drawbench usually, its product is compared with the product of thermoforming, has the high and good advantage of surface smoothness of dimensional accuracy.Empty sinking technology is one of production method of cold drawing steel tube, only need outer membrane module in the operation and need not internal mold and plug assembly, its outer membrane module comprises die holder and external mold, the die holder middle part has an axially extending bore, this through hole is used to admit external mold, and sizing area and transition region are distinguished in the work of external mold inside, and bigbore former tubing is in drawing process, behind the transition region undergauge,, make required target tubing to the sizing area sizing.
There are the following problems for the outer membrane module that adopts in the existing empty sinking technology: 1, former tubing endoporus, the wall thickness increase and decrease of can only giving free rein to is difficult to control by external mold the change in size of former tubing endoporus, wall thickness.2, whole outer membrane module work transition region is shorter, and there is the phenomenon of rapid tube reducing in former tubing, if during cold-drawn tubing process strengthening, target tubing easily produces problems such as cracking, flexibility are big, thereby influences the target pipe workpiece quality, the percent defective height.
[summary of the invention]
For overcoming the prior art above shortcomings, the utility model aims to provide a kind of external mould assembly for cold-drawing pipes, utilize and to carry out the operation of empty sinking tubing by outer membrane module, not only can control the change in size of former tubing endoporus, wall thickness by external mold, can also eliminate the phenomenon of the short rapid tube reducing of former tubing transition region, and when effectively solving cold-drawn tubing process strengthening, target tubing easily produces problems such as cracking, flexibility be big.
Realize that the above-mentioned purpose technical scheme is as follows, the structure of this external mould assembly for cold-drawing pipes, comprise die holder, the die holder middle part has an axial external mold receiving compartment, external mold receiving compartment the place ahead is the die holder outlet, it is characterized in that: be provided with front mould, back mould in the external mold receiving compartment, the aperture of back mould sizing area is greater than the aperture of front mould sizing area, and the back mould transition angle of back mould transition region is greater than the front mould transition angle of front mould transition region.
During concrete enforcement, be provided with die holder outlet lug in the die holder outlet, the aperture of the aperture of described front mould sizing area and die holder outlet lug is complementary.
During concrete enforcement, the ring wall of described external mold receiving compartment by after tapered forward, the outer wall of front mould and back mould is cylindrical, the taper ring wall of described external mold receiving compartment and front mould and after be embedded with the location voussoir between the outer wall of mould.The concentricity that location voussoir purpose is to guarantee front mould and back mould is set, forward and backward mould is closely combined be integral, be contained in the external mold receiving compartment.
During concrete enforcement, described front mould transition angle is the 24-28 degree, and back mould transition angle is the 32-36 degree.
Beneficial effect: compared with prior art, after the utility model adopts two cast outer mold structures, the one, can be according to the metal material performance of tubing, on the basis of reference practical experience, choose reasonable goes out the technological parameter of front mould and back mould, make it reasonable coupling, thereby reach the purpose that changes by external mold control target tubing endoporus, wall thickness dimension.The 2nd, behind the two external molds of employing, the mould sizing area added transition region before and after the length of whole workspace equaled, the not only corresponding length that has increased whole external mold workspace, and, the transition region of external mold is expanded, helped stage by stage former tubing being carried out tube reducing, eliminate the phenomenon of the rapid tube reducing of former tubing, when efficiently solving cold-drawn tubing process strengthening, target tubing easily produces problems such as cracking, flexibility be big.The 3rd, this outer membrane module adopts modular construction, can use front mould or back mould when needs adopt single outer mold technique equally separately, can not increase die cost.
[description of drawings]
Fig. 1 is the structural representation of an embodiment of the utility model;
Among the figure: die holder 1, location voussoir 2, front mould 3, back mould 4, die holder outlet 11, front mould sizing area 31, front mould transition region 32, back mould sizing area 41, back mould transition region 42, front mould transition angle R1, back mould transition angle R2.
[specific embodiment]
Referring to Fig. 1.Die holder 1 is fixed on the frame.The ring wall of the external mold receiving compartment of die holder 1 by after forward for the taper ring wall, front mould 3, back mould 4 are contained in the external mold receiving compartment.For guaranteeing the firmness and the concentricity of front mould 3 and back mould 4, location voussoir 2 is embedded between the outer wall of taper ring wall and front mould 3 and back mould 4, and front mould 3 and back mould 4 are combined into one tightly securely, is contained in the external mold receiving compartment.From guaranteeing the firmness and the concentricity purpose of front mould 3 and back mould 4, can realize by the means that difference changes, for example: the outer wall of front mould 3 and back mould 4 can be cylindrical, it also can be taper, as long as they be complementary with the inner hole wall of locating voussoir 2, even can on their contact-making surface, set up some uneven structures, realize purpose.The location voussoir 2 of present embodiment is that an outer wall is taper, the parts of the rounded or taper of inner hole wall.
The die holder of die holder 1 exports 11 places, and at present general die holder outlet lug can be set as required, no matter whether be provided with, the aperture of front mould sizing area 31 or with die holder outlet lug, or be complementary with die holder outlet 11, guarantee that the tubing behind the sizing passes through.If do not establish die holder outlet lug, the port of front mould 3 can extend the outlet of die holder 1, flushes with the outlet of die holder 1, helps improving the efficient of target tubing.
The aperture of front mould sizing area 31 and front mould transition region 32 should meet the draw dimensional requirement.Back mould 4 is installed in the import department of outer membrane module, thereafter the aperture of mould sizing area 41 is greater than the aperture of front mould sizing area 31, former tube wall thickness of control and sizing reduction should be satisfied in the aperture of back mould sizing area 41 and back mould transition region 42, and the maximum diameter of hole of back mould transition region 42 must be greater than the caliber of former tubing.When considering relevant issues, the experimental data that we draw is: with front mould transition angle R1 is the 24-28 degree, and back mould transition angle R2 is advisable for the 32-36 degree, and the tube reducing deflection is that the sectional area coefficient of former tubing and target tubing is to be not more than 2 for well.
During operation, forward and backward electing property of the mould coupling of this outer membrane module is selected suitable forward and backward mould, both can increase the tubing transition region, also can adjust and change the horizontal and vertical stressed variation of tubing of former single external mold draw simultaneously, the relative thick-wall tube of effect is especially obvious.
Claims (4)
1. external mould assembly for cold-drawing pipes, comprise die holder (1), die holder (1) middle part has an axial external mold receiving compartment, external mold receiving compartment the place ahead is die holder outlet (11), it is characterized in that: in the external mold receiving compartment, be provided with front mould (3), back mould (4), the aperture of back mould sizing area (41) is greater than the aperture of front mould sizing area (31), and the back mould transition angle (R2) of back mould transition region (42) is greater than the front mould transition angle (R1) of front mould transition region (32).
2. outer membrane module as claimed in claim 1 is characterized in that: be provided with die holder outlet lug in die holder outlet (11), the aperture of the aperture of described front mould sizing area (31) and die holder outlet lug is complementary.
3. outer membrane module as claimed in claim 1, it is characterized in that: the ring wall of described external mold receiving compartment by after tapered forward, the outer wall of front mould (3) and back mould (4) is cylindrical, is embedded with between the outer wall of the taper ring wall of described external mold receiving compartment and front mould (3) and back mould (4) and locatees voussoir (2).
4. outer membrane module as claimed in claim 1 is characterized in that: described front mould transition angle (R1) is the 24-28 degree, and back mould transition angle (R2) is the 32-36 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201763816U CN201644534U (en) | 2010-04-29 | 2010-04-29 | External mold assembly for cold-drawing tubular products |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201763816U CN201644534U (en) | 2010-04-29 | 2010-04-29 | External mold assembly for cold-drawing tubular products |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201644534U true CN201644534U (en) | 2010-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201763816U Expired - Fee Related CN201644534U (en) | 2010-04-29 | 2010-04-29 | External mold assembly for cold-drawing tubular products |
Country Status (1)
| Country | Link |
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| CN (1) | CN201644534U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823083A (en) * | 2010-04-29 | 2010-09-08 | 浙江伦宝金属管业有限公司 | External mould assembly for cold-drawing pipes |
| CN102284529A (en) * | 2011-08-13 | 2011-12-21 | 胡顺珍 | Tube drawing device of compound die |
| CN102513389A (en) * | 2011-11-21 | 2012-06-27 | 胡顺珍 | Long core rod composite die pipe drawing device |
| CN102513390A (en) * | 2011-12-01 | 2012-06-27 | 胡顺珍 | Short mandrel composite die tube drawing apparatus |
-
2010
- 2010-04-29 CN CN2010201763816U patent/CN201644534U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823083A (en) * | 2010-04-29 | 2010-09-08 | 浙江伦宝金属管业有限公司 | External mould assembly for cold-drawing pipes |
| CN102284529A (en) * | 2011-08-13 | 2011-12-21 | 胡顺珍 | Tube drawing device of compound die |
| CN102513389A (en) * | 2011-11-21 | 2012-06-27 | 胡顺珍 | Long core rod composite die pipe drawing device |
| CN102513390A (en) * | 2011-12-01 | 2012-06-27 | 胡顺珍 | Short mandrel composite die tube drawing apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20170429 |