CN203886955U - Cold-drawing inner die and cold-drawing die of seamless steel pipe - Google Patents
Cold-drawing inner die and cold-drawing die of seamless steel pipe Download PDFInfo
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- CN203886955U CN203886955U CN201420115966.5U CN201420115966U CN203886955U CN 203886955 U CN203886955 U CN 203886955U CN 201420115966 U CN201420115966 U CN 201420115966U CN 203886955 U CN203886955 U CN 203886955U
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Abstract
The utility model relates to a cold-drawing inner die and a cold-drawing die of a seamless steel pipe, belonging to the field of manufacturing of metal drawing molding dies. The cold-drawing die comprises the cold-drawing inner die and a cold-drawing outer die; the cold-drawing inner die is arranged in a cold-drawing die hole of the cold-drawing inner die and comprises a cold-drawing inner die body; a central section is arranged in the middle of the cold-drawing inner die body; reducing sections, fixed wall bands and outlet ends are symmetrically arranged at the two sides of the central section; the central section is of a cylindrical structure and is connected with the reducing sections at two sides; the cross section of each reducing section along the axial direction is of a tapered structure; two ends of each fixed wall band are connected with the reducing section and the outlet end on the same side, respectively; the outlet ends are provided with chamfers. The cold-drawing mould is small in drawing force, high in drawing speed and high in drawing quality; the production period of the steel pipe is shortened, the cold-drawing production efficiency is improved, the production cost is reduced, the productivity of steel pipes is improved and market requirements are met.
Description
Technical field
The utility model relates to a kind of inner die for cold-drawn process of seamless steel pipe and adopts the cold drawing die of this inner die for cold-drawn process, and the mould that belongs to metal drawing is manufactured field.
Background technology
Seamless steel pipe is continued to use traditional distortion drawing process in cold-drawn is produced always, the feature that cold drawing steel tube is produced is multi-pass, circulation is produced, production cycle is long, basic production process route: round steel → heating → perforation → drop-head → pickling → phosphatization → saponification → cold-drawn → annealing → aligning → crop end → check → finished product, cold-drawn is the core process of steel pipe's production, other is all aided process, for draw operation is prepared, cold-drawn mode mainly contains short plug (internal mold) draw and sink drawing, when in process of tube plug drawing mill, the internal diameter of steel pipe is less than 20mm, the general sink drawing that adopts, do not adopt inner die for cold-drawn process, and for the steel pipe for being greater than 20mm, in cold-drawing technology, inner die for cold-drawn process adopts following two kinds: 1, Chinese style taper internal mold, comprise sizing reduction section, determine cornice and the port of export, wherein determine cornice shorter, required Drawing Force is little, draw efficiency is high, but the pipe deformation after draw is rapid, draw quality is often very poor, this male-tapered internal mold is stressed larger in tube reducing part, easily causes internal mold wearing and tearing, needs often to change internal mold, not only wastes time and energy, and increases production cost, 2, Soviet Union's formula cylindricality inner membrance, what comprise sizing reduction section and be symmetricly set on described sizing reduction section both sides determines cornice and the port of export, it is long that it determines cornice, the distortion of steel pipe inner chamber slowly, defect is few, the quality of steel pipe draw is good, because two-end structure is symmetrical arranged, reduced the use amount of internal mold, saved cost, but long owing to determining cornice, required Drawing Force is large, and efficiency is too low, adopts the average draw lengthening coefficient of above-mentioned mould draw steel pipe single pass only to have 1.3-1.7, have a strong impact on the quantity of steel pipe drawing, restricted the raising of steel pipe production capacity and product competitiveness.
Utility model content
The deficiency that the utility model exists for above-mentioned prior art, provide a kind of simple in structure, Drawing Force is little, inner die for cold-drawn process and the cold drawing die of the seamless steel pipe that draw speed is fast, two ends all can draw steel pipe, not only Drawing Force is little for it, and draw speed is fast, has improved the lengthening coefficient of the average draw of single pass, improve the efficiency of steel pipe drawing, shortened the production cycle of steel pipe; Also improved draw quality, reduced production costs simultaneously.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: a kind of inner die for cold-drawn process of seamless steel pipe, comprise inner die for cold-drawn process body, in described inner die for cold-drawn process body, be provided with vertically through hole, it is characterized in that, the centre of described inner die for cold-drawn process body is provided with central segment, both sides in described central segment are arranged with respectively sizing reduction section, determine cornice and the port of export, described central segment is cylindrical structure, described central segment connects the sizing reduction section of both sides, described sizing reduction section cross section is in axial direction pyramidal structure, described two ends of determining cornice are connected mutually with described sizing reduction section and the port of export respectively, the described port of export is provided with chamfering.
Be symmetricly set on central segment both sides sizing reduction section, determine cornice and the port of export makes described inner die for cold-drawn process body form bipitch structure, the cold-drawn processing to steel pipe can be realized in every one end, has naturally reduced the use amount of inner die for cold-drawn process, has reduced production cost.
Above-mentioned sizing reduction section, for compressing the internal diameter of steel pipe, makes pipe deformation, adopts pyramidal structure to reduce the contact area of steel pipe and internal mold, and draw frictional force is little, and draw speed is fast, and efficiency is high; This external cause adopts taper inner die for cold-drawn process stressed larger, easily impaired, and bipitch structure setting addresses this problem, if one end wearing and tearing can be used the other end of internal mold, not only changes quick and convenient, and cost-saving;
Above-mentionedly determine cornice for the steel pipe by after tube reducing is carried out to sizing, make the steel pipe after draw there is the external diameter meeting the requirements;
The above-mentioned port of export is for the protection of determining cornice, and anti-fastening cornice exports the damage of edges of a side, and avoids steel pipe outlet time by mould, to be scratched, so the port of export adopts 45 degree chamferings.
The beneficial effects of the utility model are: the sizing reduction section structure decrease of cylindrical central segment and taper the contact area between steel pipe and draw internal mold, reduced frictional force, improved the speed of draw, the port of export adopts chamfering, avoid scratching the outer surface of steel pipe, guarantee the quality of steel pipe draw, adopt the sizing section that is applicable to length, there is Drawing Force little, draw speed is fast, the effect that draw quality is high, the relatively traditional inner die for cold-drawn process of steel pipe cross section flow of metal is slow, can make steel pipe bear larger deformation coefficient, thereby the average draw lengthening coefficient of the steel pipe single pass that the draw of having realized single pass aximal deformation value makes is brought up to 1.6-1.9 by original 1.3-1.7, realize steel tube place and needed 1 of cold-drawn passage decreased average, also save and once change head simultaneously, annealing, pickling, phosphatization, the operation expenses such as saponification, production cycle shorten in average 1/4-1/3, Tube Drawing production capacity has improved 15%, steel pipe's production cost per ton 100 yuan.
On the basis of technique scheme, the utility model can also be done following improvement.
Further, described length of determining cornice is 2～5mm.
Further, described length of determining cornice: be 4mm when 20 < d≤30,30 < d≤40 are 3.5mm, and 40 < d≤60 are 3mm, 60 < d are 2.5mm, the internal diameter that wherein d is steel pipe.
Adopt the beneficial effect of above-mentioned further scheme to be, suitable determine cornice length not only can to realize Drawing Force little, the fireballing effect of draw, and guarantee that draw quality is good.
Further, the coning angle of sizing reduction section is 8～9 degree, and axial length is 10～15mm.
Adopt the beneficial effect of above-mentioned further scheme to be, at steel pipe, in process of tube plug drawing mill, reduce the contact area of steel pipe and draw internal mold, thereby reduce draw frictional force.
Further, the chamfering of the described port of export is 45 degree
Adopt the beneficial effect of above-mentioned further scheme to be, the damage of edges of outlet one side of anti-fastening cornice, and avoid scratching steel pipe internal-surface.
Further, described inner die for cold-drawn process body adopts wolfram steel material.
Adopt the beneficial effect of above-mentioned further scheme to be, owing to adopting wolfram steel material, hardness reaches the standard of HRC >=60, and in draw, also be round and smooth external form, fineness is better, there will not be traditional zinc-plated internal mold serious wear to cause zinc coat local shedding to cause steel pipe inner chamber to produce mass defect.
A seamless steel tube cold-drawing die, comprises cold-drawn external mold, in described cold-drawn external mold, is provided with cold-drawn nib, it is characterized in that, also comprises inner die for cold-drawn process as above, and described inner die for cold-drawn process is placed in described cold-drawn nib.
The beneficial effects of the utility model are: by the process of tube plug drawing mill having cooperatively interacted to seamless steel pipe of inner die for cold-drawn process and cold-drawn external mold, adopt the Drawing Force of this cold drawing die steel pipe little, draw speed is fast, draw quality is high, has generally speaking shortened the production cycle of steel pipe, has improved cold-drawn production efficiency, reduced production cost, improved steel pipe production capacity, met the need of market, made enterprise obtain better development.
Accompanying drawing explanation
Fig. 1 is the structural representation of prior art Chinese style taper internal mold;
Fig. 2 is the structural representation of prior art Soviet Union formula cylindricality internal mold;
The structural representation of Fig. 3 the utility model inner die for cold-drawn process;
Fig. 4 is the structural representation of the utility model cold drawing die;
In Fig. 1～Fig. 4,1, central segment; 2, sizing reduction section; 3, determine cornice; 4, the port of export; 5, inner die for cold-drawn process; 6, through hole; 7, cold-drawn external mold; 8, cold-drawn nib; 9, steel pipe.
The specific embodiment
Below in conjunction with accompanying drawing, principle of the present utility model and feature are described, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
Be illustrated in figure 1 the structural representation of prior art Chinese style taper internal mold, comprise sizing reduction section 2, determine cornice 3 and the port of export 4, wherein determine cornice 3 shorter, required Drawing Force is little, and draw efficiency is high, but pipe deformation after draw is rapid, and draw quality is often very poor; This male-tapered internal mold is stressed larger in tube reducing part, easily causes internal mold wearing and tearing, needs often to change internal mold, not only wastes time and energy, and increases production cost.
Be illustrated in figure 2 the structural representation of prior art Soviet Union formula cylindricality internal mold, what comprise sizing reduction section 2 and be symmetricly set on described sizing reduction section both sides determines cornice 3 and the port of export 4, and it is long that it determines cornice 3, and the distortion of steel pipe inner chamber slowly, defect is few, the quality of steel pipe draw is good, because two-end structure is symmetrical arranged, has reduced the use amount of internal mold, saved cost, but cornice 3 is long owing to determining, required Drawing Force is large, and efficiency is too low.
As shown in Figure 3, a kind of inner die for cold-drawn process of seamless steel pipe, comprise inner die for cold-drawn process body, in described inner die for cold-drawn process body, be provided with vertically through hole 6, the centre of described inner die for cold-drawn process body is provided with central segment 1, both sides in described central segment 1 are arranged with respectively sizing reduction section 2, determine cornice 3 and the port of export 4, described central segment 1 is cylindrical structure, described central segment 1 connects the sizing reduction section 2 of both sides, described sizing reduction section 2 cross section is in axial direction pyramidal structure, described two ends of determining cornice 3 are connected mutually with described sizing reduction section 2 and the port of export 4 respectively, and the described port of export is provided with chamfering.
Be symmetricly set on central segment both sides sizing reduction section 2, determine cornice 3 and the port of export 4 makes described inner die for cold-drawn process body form bipitch structure, the cold-drawn processing to steel pipe can be realized in every one end, naturally the use amount that has reduced inner die for cold-drawn process, has reduced production cost.
Described length of determining cornice is 2～5mm.
Described length of determining cornice: 20 < d≤30 o'clock are 4mm, 30 < d≤40 are 3.5mm, and 40 < d≤60 are 3mm, and 60 < d are 2.5mm, the internal diameter that wherein d is steel pipe.
The coning angle of sizing reduction section is 8～9 degree, and axial length is 10～15mm.At steel pipe, in process of tube plug drawing mill, reduce the contact area of steel pipe and draw internal mold, thereby reduce draw frictional force.
The chamfering of the described port of export is 45 degree.The damage of edges of outlet one side of anti-fastening cornice, and avoid scratching steel pipe internal-surface.
Described inner die for cold-drawn process body adopts wolfram steel material.Owing to adopting wolfram steel material, hardness reaches the standard of HRC >=60, and in draw, is also round and smooth external form, and fineness is better, there will not be traditional zinc-plated internal mold serious wear to cause zinc coat local shedding to cause steel pipe inner chamber to produce mass defect.
The utility model draw external diameter is that φ 76mm, wall thickness are 3.5mm, internal diameter while being φ 69mm seamless steel pipe 7, and adopting the length of inner die for cold-drawn process is 48mm, and external diameter is φ 69 mm; The diameter of determining cornice is φ 69mm, and length is 2.5 mm; The coning angle of sizing reduction section is 8.9 degree, and axial length is 14 mm; Central segment length is 8mm, and diameter is 64.6mm; The angle of taper of described outlet section is 45 degree, and length is 3.5mm.
As shown in Figure 4, a kind of seamless steel tube cold-drawing die, comprises cold-drawn external mold 7, in described cold-drawn external mold 7, is provided with cold-drawn nib 8, also comprises inner die for cold-drawn process 5 as above, and described inner die for cold-drawn process 5 is placed in described cold-drawn nib 8.
By the process of tube plug drawing mill having cooperatively interacted to seamless steel pipe 9 of inner die for cold-drawn process and cold-drawn external mold, adopt the Drawing Force of this cold drawing die steel pipe little, draw speed is fast, draw quality is high, has generally speaking shortened the production cycle of steel pipe, has improved cold-drawn production efficiency, reduced production cost, improved steel pipe production capacity, met the need of market, made enterprise obtain better development.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (6)
1. the inner die for cold-drawn process of a seamless steel pipe, comprise inner die for cold-drawn process body, in described inner die for cold-drawn process body, be provided with vertically through hole, it is characterized in that, the centre of described inner die for cold-drawn process body is provided with central segment, both sides in described central segment are arranged with respectively sizing reduction section, determine cornice and the port of export, described central segment is cylindrical structure, described central segment connects the sizing reduction section of both sides, described sizing reduction section cross section is vertically pyramidal structure, described two ends of determining cornice are connected mutually with described sizing reduction section and the port of export respectively, and the described port of export is provided with chamfering; Described length of determining cornice is 2～5mm.
2. the inner die for cold-drawn process of seamless steel pipe according to claim 1, it is characterized in that, described length of determining cornice: be 4mm when 20 < d≤30,30 < d≤40 are 3.5mm, 40 < d≤60 are 3mm, 60 < d are 2.5mm, the internal diameter that wherein d is steel pipe.
3. the inner die for cold-drawn process of seamless steel pipe according to claim 1 and 2, is characterized in that, the coning angle of described sizing reduction section is 8～9 degree, and axial length is 10～15mm.
4. the inner die for cold-drawn process of seamless steel pipe according to claim 1 and 2, is characterized in that, the chamfering of the described port of export is 45 degree.
5. the inner die for cold-drawn process of seamless steel pipe according to claim 1 and 2, is characterized in that, described inner die for cold-drawn process body adopts wolfram steel material.
6. a seamless steel tube cold-drawing die, comprises cold-drawn external mold, in described cold-drawn external mold, is provided with cold-drawn nib, it is characterized in that, also comprises the inner die for cold-drawn process as described in claim 1～5 any one, and described inner die for cold-drawn process is placed in described cold-drawn nib.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420115966.5U CN203886955U (en) | 2014-03-14 | 2014-03-14 | Cold-drawing inner die and cold-drawing die of seamless steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420115966.5U CN203886955U (en) | 2014-03-14 | 2014-03-14 | Cold-drawing inner die and cold-drawing die of seamless steel pipe |
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| Publication Number | Publication Date |
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| CN203886955U true CN203886955U (en) | 2014-10-22 |
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|---|---|---|---|
| CN201420115966.5U Expired - Fee Related CN203886955U (en) | 2014-03-14 | 2014-03-14 | Cold-drawing inner die and cold-drawing die of seamless steel pipe |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107234140A (en) * | 2016-03-29 | 2017-10-10 | 泰州市唯特精密机械有限公司 | A kind of seamless pipe processing device |
| CN108927420A (en) * | 2017-05-23 | 2018-12-04 | 常州常宝精特钢管有限公司 | A kind of the large deformation cold-drawing technology and production line of seamless steel pipe |
| CN113857278A (en) * | 2021-09-29 | 2021-12-31 | 大连开成钢管有限公司 | GY type internal mold for cold-drawing steel pipe |
| CN115301751A (en) * | 2022-10-11 | 2022-11-08 | 江苏新恒基特种装备股份有限公司 | Method and device for measuring wall thickness of branch pipe and imaging bulge position of multi-branch pipe |
-
2014
- 2014-03-14 CN CN201420115966.5U patent/CN203886955U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107234140A (en) * | 2016-03-29 | 2017-10-10 | 泰州市唯特精密机械有限公司 | A kind of seamless pipe processing device |
| CN108927420A (en) * | 2017-05-23 | 2018-12-04 | 常州常宝精特钢管有限公司 | A kind of the large deformation cold-drawing technology and production line of seamless steel pipe |
| CN113857278A (en) * | 2021-09-29 | 2021-12-31 | 大连开成钢管有限公司 | GY type internal mold for cold-drawing steel pipe |
| CN115301751A (en) * | 2022-10-11 | 2022-11-08 | 江苏新恒基特种装备股份有限公司 | Method and device for measuring wall thickness of branch pipe and imaging bulge position of multi-branch pipe |
| CN115301751B (en) * | 2022-10-11 | 2022-12-27 | 江苏新恒基特种装备股份有限公司 | Method and device for measuring wall thickness of branch pipe and imaging bulge position of multi-branch pipe |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141022 Termination date: 20150314 |
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| EXPY | Termination of patent right or utility model |