CN202070588U - Inner die for cold-drawing steel tube mould - Google Patents
Inner die for cold-drawing steel tube mould Download PDFInfo
- Publication number
- CN202070588U CN202070588U CN2011200896410U CN201120089641U CN202070588U CN 202070588 U CN202070588 U CN 202070588U CN 2011200896410 U CN2011200896410 U CN 2011200896410U CN 201120089641 U CN201120089641 U CN 201120089641U CN 202070588 U CN202070588 U CN 202070588U
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- Prior art keywords
- internal mold
- core bar
- nut
- steel pipe
- section
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- Expired - Fee Related
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Abstract
The utility model discloses an inner die for a cold-drawing steel tube mould, which comprises a core rod (1), an inner die (2) and a screw nut (3), wherein the inner die (2) is sleeved on a small-diameter stair section (1-1) of the core rod (1); the screw nut (3) is screwed with an external thread section (1-2) of the core rod (1); a connecting structure (1-4) which is concentric with the core rod (1) and is used for being connected with a drawing core rod is arranged on the end face of a large-diameter stair section (1-3) of the core rod (1); a hollow section (4) is arranged at the external end of the core rod (1) in threaded connection with the screw nut (3); and the inner die for the cold-drawing steel tube mould is characterized in that a metal welding layer (5) which is used for preventing the screw nut from withdrawing externally is welded in the hollow section (4). The inner die for the cold-drawing steel tube mould has the advantages of reasonable structure, excellent processing property and the like.
Description
Technical field
The utility model relates to a kind of internal mold of cold drawn steel pipe die, belongs to into structural section production technology equipment technology.
Background technology
Described cold drawing steel tube internal mold is formed the cold drawn steel pipe die with external mold.
Steel tube blank under the operating mode travels forward under trailer wagon drives, and is in internal mold in the steel pipe then under the controlling of plug, and relative with the external mold that is in the fixation state all the time the configuration finished the cold-drawn moulding of steel pipe.
Because internal mold is under its operating mode, be subjected to the effect of the frictional force of the shearing of axial pulling force and steel pipe reducing (hole enlargement) and internal mold cylindrical and steel pipe inwall for a long time, thereby internal mold must possess enough tensile strength and processing performances such as rigidity and case hardness.For this reason, existing internal mold generally all is to adopt expensive steel alloy to handle and preparation according to technological requirement processing and through surface hardening.
In order to reduce the internal mold preparation cost, the existing at present interior membrane module of being made up of the core bar and the securing member of steel alloy internal mold and carbon steel comes out, and CN2313685Y is disclosed such as the Chinese patent Granted publication, has obtained favorable economic benefit.
Yet the above-mentioned patent of prior art can produce loosening owing to existing such as its securing member inevitably; And the less isostructuralism deficiency of ratio of its core bar end step section external diameter and internal mold external diameter, so that influence the processing performance that it should possess.
Summary of the invention
The utility model aims to provide a kind of rational in infrastructure, and the internal mold of the cold drawn steel pipe die that processing performance is good is to overcome the deficiency of prior art.
The utility model realizes that the technical scheme of its purpose is:
A kind of internal mold of cold drawn steel pipe die comprises core bar, internal mold and nut; Described internal mold is sleeved on the minor diameter step section of core bar, and the external thread section screw thread of nut and core bar is twisted and to be connect, and its innovative point is, at the end face of the major diameter step section of core bar, is provided with and being used for and drawing plug connection structure connecting of core bar concentric arrangement; In the outer end that core bar is connected with nut thread one hollow section is arranged, sealing weld has and is used for stoping the metal solder layer that moves back outside the nut in described hollow section.
Can understand that by above given technical scheme the utility model is owing to adopt metal sealing weld layer to make fastener nut and the solid and reliable ways of connecting of core bar.It is loosening effectively to have avoided fastener nut to produce, thereby makes internal mold, core bar and fastener nut three constitute inseparable integral body, has guaranteed its favorable manufacturability energy, thereby has realized the purpose of this utility model.
Because steel tube blank interior circle reducing (hole enlargement) amount is less under the operating mode, thereby the radially working face of its internal mold side end face needn't be excessive, axial rigidity and shear resistance with effective raising internal mold, the utility model is also advocated, the external diameter of the major diameter step section of described core bar and the external diameter of nut, all less than and near the external diameter of internal mold.Thus, the external diameter of fastener nut and internal mold faying face equates with the diameter of core bar major diameter step section, and all than about the little 3～5mm of internal mold external diameter.So structural relation can also make internal mold fix highly stable reliably, has guaranteed the operate as normal of internal mold.
The utility model also advocates, in set being used for and drawing plug connection structure connecting of end face of the major diameter step section of core bar, is inner bolt hole or external screw rod.
In technique scheme, the present invention advocates that also the axial length of the minor diameter step section of core bar is less than the axial length of internal mold.This technical scheme can make internal mold can not produce axial play, and fixes more firmly.
In technique scheme, the utility model also advocates, the free end that described nut is its cylindrical is to the circular cone shape structure that enlarges gradually with the internal mold binding end.Because nut is frustum, can effectively avoid because the contacting of its moulding internal diameter that the forward travel of steel pipe non-rectilinear is produced and fastener nut, and cause the non-manufacturability of pipe diameter to change, influence the quality of the steel pipe of becoming a useful person.
After technique scheme was able to concrete enforcement, what the utility model had was rational in infrastructure, and processing performance is good, and characteristics such as long service life are conspicuous.
Description of drawings
Fig. 1 is the structural representation of a kind of specific embodiment of the utility model; The syndeton 1-4 that is located at the major diameter step section 1-3 end face of core bar 1 shown in the figure is a screw.
The specific embodiment
Below contrast accompanying drawing, the specific embodiment of the present utility model is described specifically.
One of specific embodiment, as shown in Figure 1.
A kind of internal mold of cold drawn steel pipe die comprises core bar 1, internal mold 2 and nut 3; Described internal mold 2 is sleeved on the minor diameter step section 1-1 of core bar 1, nut 3 is twisted with the external thread section 1-2 screw thread of core bar 1 and is connect, at the end face of the major diameter step section 1-3 of core bar 1, be provided with and being used for and drawing plug connection structure connecting 1-4 of core bar 1 concentric arrangement; In the outer end that core bar 1 is threaded with nut 3 one hollow section 4 is arranged, sealing weld has and is used for stoping the metal solder layer 5 that moves back outside the nut in described hollow section 4.The external diameter of the major diameter step section 1-3 of described core bar 1 and the external diameter of nut 3, all less than and near the external diameter of internal mold 2.In set being used for and drawing plug connection structure connecting 1-4 of end face of the major diameter step section 1-3 of core bar 1, be inner bolt hole.The axial length of the minor diameter step section 1-1 of core bar 1 is less than the axial length of internal mold 2.
Two of the specific embodiment please be joined and be read accompanying drawing 1.
A kind of internal mold of cold drawn steel pipe die comprises core bar 1, internal mold 2 and nut 3; Described internal mold 2 is sleeved on the minor diameter step section 1-1 of core bar 1, nut 3 is twisted with the external thread section 1-2 screw thread of core bar 1 and is connect, at the end face of the major diameter step section 1-3 of core bar 1, be provided with and being used for and drawing plug connection structure connecting 1-4 of core bar 1 concentric arrangement; In the outer end that core bar 1 is threaded with nut 3 one hollow section 4 is arranged, sealing weld has and is used for stoping the metal solder layer 5 that moves back outside the nut in described hollow section 4.The external diameter of the major diameter step section 1-3 of described core bar 1 and the external diameter of nut 3, all less than and near the external diameter of internal mold 2.In set being used for and drawing plug connection structure connecting 1-4 of end face of the major diameter step section 1-3 of core bar 1, be external screw rod.The axial length of the minor diameter step section 1-1 of core bar 1 is less than the axial length of internal mold 2.
In the above specific embodiment, described internal mold 2 adopts the mould alloy steel to do, and core bar 1 and nut 3 adopt the high strength carbon steel to do.
The utility model first sample trial effect is very gratifying.
Claims (5)
1. the internal mold of a cold drawn steel pipe die comprises core bar (1), internal mold (2) and nut (3); Described internal mold (2) is sleeved on the minor diameter step section (1-1) of core bar (1), nut (3) is twisted with external thread section (1-2) screw thread of core bar (1) and is connect, it is characterized in that, at the end face of the major diameter step section (1-3) of core bar (1), be provided with and being used for and drawing plug connection structure connecting (1-4) of core bar (1) concentric arrangement; There is a hollow section (4) outer end that is threaded with nut (3) at core bar (1), and sealing weld has and is used for stoping the metal solder layer (5) that moves back outside the nut in described hollow section (4).
2. according to the internal mold of the described cold drawn steel pipe die of claim 1, it is characterized in that, the external diameter of the major diameter step section (1-3) of described core bar (1) and the external diameter of nut (3), all less than and near the external diameter of internal mold (2).
3. the internal mold of cold drawn steel pipe die according to claim 1 and 2 is characterized in that, in set being used for and drawing plug connection structure connecting (1-4) of end face of the major diameter step section (1-3) of core bar (1), is inner bolt hole or external screw rod.
4. the internal mold of cold drawn steel pipe die according to claim 1 is characterized in that, the axial length of the minor diameter step section (1-1) of core bar (1) is less than the axial length of internal mold (2).
5. the internal mold of cold drawn steel pipe die according to claim 1 is characterized in that, the free end that described nut (3) is its cylindrical is to the circular cone shape structure that enlarges gradually with internal mold (2) binding end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200896410U CN202070588U (en) | 2011-03-31 | 2011-03-31 | Inner die for cold-drawing steel tube mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200896410U CN202070588U (en) | 2011-03-31 | 2011-03-31 | Inner die for cold-drawing steel tube mould |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202070588U true CN202070588U (en) | 2011-12-14 |
Family
ID=45108700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200896410U Expired - Fee Related CN202070588U (en) | 2011-03-31 | 2011-03-31 | Inner die for cold-drawing steel tube mould |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202070588U (en) |
-
2011
- 2011-03-31 CN CN2011200896410U patent/CN202070588U/en not_active Expired - Fee Related
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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: 20111214 Termination date: 20190331 |