CN217889092U

CN217889092U - Spherical drawing die

Info

Publication number: CN217889092U
Application number: CN202222132282.3U
Authority: CN
Inventors: 张根明
Original assignee: CHANGSHU SPECIAL STEEL TUBE CO LTD
Current assignee: CHANGSHU SPECIAL STEEL TUBE CO LTD
Priority date: 2022-08-12
Filing date: 2022-08-12
Publication date: 2022-11-25
Anticipated expiration: 2032-08-12

Abstract

The utility model discloses a sphere drawing die utensil, include: the die comprises a fixed die holder, a spherical die holder and a spherical die body, wherein the spherical die holder is detachably arranged on the fixed die holder; along the drawing and discharging direction, the front end of the spherical die body is provided with a first spherical surface, the rear end of the spherical die holder is provided with a second spherical surface, and the spherical die body is matched with the second spherical surface of the spherical die holder through the first spherical surface and can rotate relative to the spherical die holder; the fixed die holder, the spherical die holder and the spherical die body are provided with inner holes for the steel pipes to penetrate through. The utility model improves the straightness of the drawn steel pipe through the contact and matching design of the spherical surfaces of the spherical die holder and the spherical die body; through the structural design of the spherical die body, the elongation rate of one-time drawing is improved, the production period of the steel pipe is shortened, the productivity and the yield of the steel pipe are improved, and the prepared drawn steel pipe is good in straightness and smooth in surface.

Description

Spherical drawing die

Technical Field

The utility model relates to a steel pipe drawing equipment field especially relates to a sphere drawing die utensil.

Background

The cold-drawn steel pipe is a whole steel pipe without seams on the surface, which is produced by drawing, extruding, perforating and other methods, and is a round, square or rectangular steel material with a hollow section and no seams on the periphery, which is produced by perforating a steel ingot or a solid pipe blank and then cold-drawing. The drawing die is an important apparatus for manufacturing a cold drawn steel pipe, in addition to a cold drawing machine, and it is an important measure for straightness of the steel pipe after drawing. The drawing efficiency and the like have important influences.

The structure of the existing drawing die adopts a single multi-section conical inlet design, as shown in the Chinese patent CN 106180231B, the elongation of each pass (corresponding to each conical section) is low and is only 1.3-1.6, the number of drawing passes is large, the production period is long, the production energy consumption is large, the danger and the waste are large, and the production requirements of energy conservation and environmental protection are not met.

In addition, in the process of implementing the technical solution of the invention in the embodiment of the present application, the inventor of the present application finds that the drawing die in the prior art also has the following technical problems: the straightness of the drawn steel pipe is low.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a spherical drawing die has solved the above-mentioned problem that drawing die among the prior art exists.

In order to solve the technical problem, the utility model provides a spherical drawing die, include: the die comprises a fixed die holder, a spherical die holder and a spherical die body, wherein the spherical die holder is detachably arranged on the fixed die holder; along the drawing and discharging direction, the front end of the spherical die body is provided with a first spherical surface, the rear end of the spherical die holder is provided with a second spherical surface, and the spherical die body is matched with the second spherical surface of the spherical die holder through the first spherical surface and can rotate relative to the spherical die holder; the fixed die holder, the spherical die holder and the spherical die body are provided with inner holes for the steel pipes to penetrate through.

In a preferred embodiment of the present invention, the radius of the first spherical surface is 100mm or 150mm.

In a preferred embodiment of the present invention, along the drawing and discharging direction, the spherical die body sequentially comprises a first feeding section, a second feeding section, a sizing section and an outlet section; and the central lines of the inner holes of the first feeding section, the second feeding section, the sizing section and the outlet section are collinear.

In a preferred embodiment of the present invention, the first feeding section is a bell mouth structure with a gradually reduced inner hole, and the inner side wall surface of the bell mouth structure adopts an arc bus transition.

In a preferred embodiment of the present invention, the length of the first feeding section is 20 to 50mm.

In a preferred embodiment of the present invention, the second feeding section is a tapered structure with gradually decreasing inner hole, and the inlet taper is 15-17 °.

In a preferred embodiment of the present invention, the length of the second feeding section is 15 to 20mm.

In a preferred embodiment of the present invention, the length of the sizing section is 7-10 mm, and the diameter of the inner hole is the same as the diameter of the drawn steel pipe.

In a preferred embodiment of the present invention, the outlet section is an inverted cone structure with a gradually increasing inner hole, and the taper is 23-25 °.

In a preferred embodiment of the present invention, the length of the outlet section is 10 to 13mm.

The beneficial effects of the utility model are that: the utility model relates to a spherical drawing die, which improves the straightness of a drawn steel pipe through the contact and matching design of the spherical die holder and the spherical surface of the spherical die body; the prepared drawn steel pipe has good straightness, smooth surface and high quality.

Drawings

Fig. 1 is a schematic perspective view of a preferred embodiment of a spherical drawing die of the present invention;

the parts in the drawings are numbered as follows: 1. the die comprises a fixed die holder, 2 parts of a spherical die holder, 3 parts of a spherical die body, 21 parts of a second spherical surface, 31 parts of a first spherical surface, 32 parts of a first feeding section, 33 parts of a second feeding section, 34 parts of a sizing section and 35 parts of an outlet section.

Detailed Description

The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.

Referring to fig. 1, an embodiment of the present invention includes:

the utility model discloses a spherical drawing die utensil through spherical face contact complex design between spherical die holder and the spherical mould body for drawing die utensil can finely tune and draw the center, further improves the straightness accuracy of drawing back steel pipe, thereby improves and draws the quality.

Example 1

A spherical drawing die, comprising: the die comprises a fixed die holder 1, a spherical die holder 2 and a spherical die body 3.

Specifically, along drawing ejection of compact direction, the front end of spherical mould body 3 has first spherical surface 31, the rear end (towards the one end of spherical mould body 3) of spherical die holder 2 has second spherical surface 21, spherical mould body 3 passes through first spherical surface 31 with the contact cooperation of second spherical surface 21 of spherical die holder 2, just spherical mould body 3 can be relative spherical die holder 2 rotates to realize finely tuning the effect at drawing the center.

The front end of the spherical die holder 2 is detachably arranged on the fixed die holder 1. Through detachable installation design, can satisfy the demand of drawing the steel pipe of different diameters, improve drawing die's application scope and practicality.

Specifically, the spherical die body 3 has two specifications, the radius of the first spherical surface 31 corresponding to the first specification is 150mm, and the spherical die body is used for drawing a steel pipe with the diameter of 60-100 mm; the first spherical surface 31 of the second specification has a radius of 100mm and is used for drawing a steel pipe having a diameter of less than 60 mm. The first spherical surface 31 and the second spherical surface 21 have the same hardness of 45HRC to 50HRC and a surface roughness of 0.8.

The fixed die holder 1, the spherical die holder 2 and the spherical die body 3 are provided with inner holes for the steel pipes to penetrate through, and the central lines of the inner holes are collinear to ensure the straightness of the drawn steel pipes.

Along the drawing and discharging direction, the spherical die body 3 sequentially comprises a first feeding section 32, a second feeding section 33, a sizing section 34 and an outlet section 35; and the central lines of the inner holes of the first feeding section 32, the second feeding section 33, the sizing section 34 and the outlet section 35 are collinear to ensure the straightness of the drawn steel pipe. The length of the first feed section 32 is greater than the length of the second feed section 33. Through the two-section design of the feeding area, on one hand, drawing passes are reduced, the drawing efficiency is improved, and the drawing period is shortened; on the other hand, the deformation of single pass is improved, so that the elongation is effectively improved, and the elongation of single pass is improved to 1.6-2.3.

Specifically, along the drawing and discharging direction, the first feeding section 32 is of a bell mouth structure with an inner hole gradually reduced, and the length is 20-50 mm. The inner side wall surface of the bell mouth structure is in arc-shaped bus transition, and the radius R of the arc-shaped bus is 100-200 mm. The first feed section 32 is configured to allow uniform extrusion of the steel tube inlet portion.

Specifically, along the drawing and discharging direction, the second feeding section 33 is a conical structure with a gradually reduced inner hole, and the length is 15-20 mm. The inlet taper of the second feeding section 33 is 15-17 deg. The structural design of the second feeding section 33 can further reduce the outer diameter of the steel pipe, is favorable for the smooth operation of the steel pipe, and prevents the tail flicking of the steel pipe during drawing.

The length of the sizing section 34 is 7-10 mm, and the diameter of an inner hole of the sizing section is the same as that of the drawn steel pipe. The length design of the sizing section (also called a sizing belt) is longer than that of the sizing belt of the traditional die, so that the uniformity and stability of the size of the drawn steel pipe are ensured, and the wear resistance and durability of the die are realized.

Specifically, along the drawing and discharging direction, the outlet section 35 is of an inverted cone structure with an inner hole gradually enlarged, the length is 10-13 mm, the taper is 23-25 degrees, and the surface of the steel pipe can be prevented from being scratched due to abrasion of the edge of the outlet side of the sizing belt.

The utility model discloses a sphere drawing die utensil, except with spherical face contact complex design between spherical die holder and the spherical mould body, still through the structural design of spherical mould body, improved the percentage elongation of once drawing, shortened steel pipe production cycle, improved productivity and steel pipe lumber recovery, concrete advantage as follows:

1. the drawing force is small, the inlet design is round and reasonable, the deformation requirement of the steel pipe is met, the drawing motion process is stable, the deformation is uniform, and the steel pipe is wear-resistant;

2. the geometry and the size of the drawn steel pipe meet the national standard requirements of process tolerance and the like, the straightness is improved, the workload of annealing and straightening in the subsequent process is reduced, and the yield of the steel pipe is improved;

3. the surface is smooth, no scratch or iron is adhered, and the straightness is good;

4. the service life of the die is long.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A spherical drawing die, comprising: the die comprises a fixed die holder, a spherical die holder and a spherical die body, wherein the spherical die holder is detachably arranged on the fixed die holder; along the drawing and discharging direction, the front end of the spherical die body is provided with a first spherical surface, the rear end of the spherical die holder is provided with a second spherical surface, and the spherical die body is matched with the second spherical surface of the spherical die holder through the first spherical surface and can rotate relative to the spherical die holder; the fixed die holder, the spherical die holder and the spherical die body are provided with inner holes for the steel pipes to penetrate through.

2. The spherical drawing die according to claim 1, wherein the radius of the first spherical surface is 100mm or 150mm.

3. The spherical drawing die of claim 2, wherein along the drawing discharge direction, the spherical die body comprises a first feeding section, a second feeding section, a sizing section and an outlet section in sequence; and the central lines of the inner holes of the first feeding section, the second feeding section, the sizing section and the outlet section are collinear.

4. The spherical drawing die according to claim 3, wherein the first feeding section is a bell mouth structure with an inner hole gradually reduced, and an inner side wall surface of the bell mouth structure adopts arc-shaped bus transition.

5. The spherical drawing die of claim 4, wherein the length of the first feeding section is 20 to 50mm.

6. The spherical drawing die of claim 3, wherein the second feeding section is a tapered structure with a gradually reduced inner bore, and the inlet taper is 15-17 °.

7. The spherical drawing die of claim 6, wherein the length of the second feeding section is 15 to 20mm.

8. The spherical drawing die according to claim 3, wherein the length of the sizing section is 7-10 mm, and the diameter of the inner hole of the sizing section is the same as that of the drawn steel pipe.

9. The spherical drawing die according to claim 3, wherein the outlet section is an inverted cone structure with gradually enlarged inner hole, and the taper is 23-25 °.

10. The spherical drawing die of claim 9, wherein the length of the outlet section is 10 to 13mm.