阅读说明：本技术 一种硬质合金拉丝模具 (Hard alloy wire drawing die ) 是由 嵇建斌 胡筱 于 2021-06-22 设计创作，主要内容包括：本发明公开了一种硬质合金拉丝模具,属于拉丝模具技术领域,包括模芯,所述模芯为圆柱形,模芯中心设有内孔,所述内孔包括入口区、工作区、定径区和出口区,入口区为圆弧面喇叭口形状,工作区为圆台形状,定径区为圆柱形状,出口区为圆台形状；模芯的直径与高度比为9～13：14。相对于传统的拉丝模,工作区圆台形状的圆锥顶角角度减小,工作区段长度增大,工作面更加平缓,钢丝的拉拔速度比现有技术增加3倍以上；拉拔镀锌钢丝时钢丝表面的镀锌层被刮落的数量同现有技术相比降低了20%以上；在进行钢丝拉拔加工时钢丝对模芯造成的磨损明显减小；拉拔时钢丝发热量明显降低,有效避免了拉拔钢丝因发热温度升高而被氧化,增加了钢丝的强度。(The invention discloses a hard alloy wire drawing die, which belongs to the technical field of wire drawing dies and comprises a die core, wherein the die core is cylindrical, an inner hole is formed in the center of the die core, the inner hole comprises an inlet area, a working area, a sizing area and an outlet area, the inlet area is in the shape of a circular arc surface bell mouth, the working area is in the shape of a circular truncated cone, the sizing area is in the shape of a cylinder, and the outlet area is in the shape of a circular truncated cone; the diameter and height ratio of the mold core is 9-13: 14. compared with the traditional wire drawing die, the conical vertex angle of the circular truncated cone shape of the working area is reduced, the length of the working section is increased, the working surface is more gentle, and the drawing speed of the steel wire is increased by more than 3 times compared with the prior art; compared with the prior art, the number of scraped zinc coating on the surface of the steel wire is reduced by more than 20 percent when the galvanized steel wire is drawn; the abrasion of the steel wire to the mold core is obviously reduced when the steel wire is subjected to drawing processing; the heating value of the steel wire is obviously reduced during drawing, the phenomenon that the drawn steel wire is oxidized due to the rise of heating temperature is effectively avoided, and the strength of the steel wire is increased.)

1. The utility model provides a carbide wire drawing mould, includes mold core (1), mold core (1) is cylindrical, mold core (1) center is equipped with the hole, the hole includes entry district (101), workspace (102), sizing district (103) and export district (104), characterized by: the inlet area (101) is in a circular arc surface bell mouth shape, the working area (102) is in a circular truncated cone shape, the sizing area (103) is in a cylindrical shape, and the outlet area (104) is in a circular truncated cone shape; the diameter and height ratio of the mold core (1) is 9-13: 14.

2. the hard alloy wire drawing die as set forth in claim 1, wherein: the cone vertex angle gamma of the circular truncated cone shape of the working area (102) is 16-24 degrees.

3. The hard alloy wire drawing die as set forth in claim 1, wherein: the cone vertex angle gamma of the circular truncated cone shape of the working area (102) is 20.5-21.5 degrees.

4. The hard alloy wire drawing die as set forth in claim 1, wherein: the cone vertex angle gamma of the circular truncated cone shape of the working area (102) is 20.8 degrees.

5. The hard alloy wire drawing die as set forth in claim 1, wherein: the diameter D of the mold core (1) is 16-25 mm.

6. The hard alloy wire drawing die as set forth in claim 1, wherein: the diameter D of the mold core (1) is 22mm, and the height of the mold core is 28 mm.

7. The hard alloy wire drawing die as set forth in claim 6, wherein: the height of the working area (102) is 16-23 mm.

8. The hard alloy wire drawing die as set forth in claim 7, wherein: the height of the working area (102) is 20.5 mm.

9. The hard alloy wire drawing die as set forth in claim 1, wherein: the cone vertex angle alpha of the circular truncated cone shape of the outlet area (104) is 20-75 degrees.

Technical Field

The invention relates to the field of wire drawing dies, in particular to a hard alloy wire drawing die.

Background

The wire is widely applied to communication, building, electric power and other departments. In wire production, drawing is one of the most common processing methods. The wire-drawing die is a very important consumable die in the drawing production of various metal wires, and the cost of the wire-drawing die accounts for more than 50 percent of the drawing cost. The wire-drawing dies commonly used at present include alloy steel dies, diamond dies and hard alloy dies.

Related patent technology, literature search and comparative description.

Authorized bulletin number CN204817507U, authorized bulletin day 2015.12.02, utility model name wire drawing mould: in order to realize the purpose of the invention, the utility model adopts the following technical scheme: the utility model provides a wire drawing mould, includes die sleeve and mold core, the mold core includes end cover and stem, end cover and stem are equipped with a nib altogether, end cover and die sleeve are equipped with the location screw altogether, and the end cover passes through location screw threaded connection with the die sleeve, the stem takes the screwed cylinder for the surface, the inside threaded hollow cylinder that takes that is equipped with the stem matches that is equipped with of die sleeve, the die sleeve is the cylinder, the mold core is equipped with import district, lubrication district, buffers, compression area, sizing district and export district in proper order. The core column and the die sleeve are tightly connected through the threads, the core column and the die sleeve are not easy to slide, the circumferential stability is increased, meanwhile, the core column and the die sleeve are connected through the positioning screw holes in a threaded manner, the stability between the core column and the die sleeve is ensured, the abrasion coefficient can be reduced in the using process, the service life of the die is greatly prolonged, and meanwhile, the die is convenient to disassemble and assemble and is suitable for industrial application; the buffer area and the compression area exist simultaneously, so that the reduction and the uniform distribution of the friction force of the wire rod in the drawing process are facilitated, the abrasion of a die hole of the wire drawing die is reduced, and the service life of the die is prolonged.

Authorized bulletin number CN203343197U, authorized bulletin date 2013.12.18, utility model name pass structural polycrystalline diamond wire-drawing die: an object of the utility model is to overcome prior art not enough, provide a polycrystalline diamond wire drawing die of hole type structure, through processing reasonable pass, improve the life of mould. The utility model is realized by the following technical proposal that the die core of the wire-drawing die comprises an inlet area, a lubricating area, a compression area, a sizing area and an outlet area which are arranged in the die core from top to bottom in sequence; the top opening of the inlet area is larger than the bottom opening, and the lubricating area is respectively connected with the inlet area and the compression area; the top opening of the compression area is larger than the bottom opening, the cross section of the compression area is in an isosceles trapezoid shape, and the compression angle of the compression area is 8-9 degrees; the sizing zone is cylindrical and the top opening of the exit zone is smaller than the bottom. As one of the preferable modes of the present invention,

the height of the compression area is 1/3-1/4 of the height of the mold core. The ratio of the height to the diameter of the sizing area is 1: 4-1: and 5, the height of the sizing area is 30 percent of the diameter of the steel wire.

The traditional wire-drawing die has a large working area angle and a small working section length. The die core is easily abraded during wire drawing processing; the galvanized layer on the surface of the steel wire is easy to be scraped off when the galvanized steel wire is drawn; the steel wire is easy to generate heat during drawing, and the like.

Disclosure of Invention

The invention aims to overcome the difficulties of the background technology and provides a hard alloy wire drawing die.

In order to achieve the purpose, the technical scheme is as follows: a hard alloy wire drawing die comprises a die core, wherein the die core is cylindrical, an inner hole is formed in the center of the die core, the inner hole comprises an inlet area, a working area, a sizing area and an outlet area, the inlet area is in the shape of a circular arc surface bell mouth, the working area is in the shape of a circular truncated cone, the sizing area is in the shape of a cylinder, and the outlet area is in the shape of a circular truncated cone; the diameter and height ratio of the mold core is 9-13: 14.

further, the cone vertex angle gamma of the working area circular truncated cone shape is 16-24 degrees.

Furthermore, the cone vertex angle gamma of the circular truncated cone shape of the working area is 20.5-21.5 degrees.

Further, the cone vertex angle gamma of the circular truncated cone shape of the working area is 20.8 degrees.

Further, the diameter D of the mold core is 16-25 mm.

Further, the diameter D of the mold core is 22mm, and the height of the mold core is 28 mm.

Further, the height of the working area is 16-23 mm.

Further, the height of the working area is 20.5 mm.

Further, the cone vertex angle alpha of the circular truncated cone shape of the outlet area is 20-75 degrees.

The beneficial effect who adopts above-mentioned scheme does: compared with the traditional wire drawing die, the hard alloy wire drawing die has the advantages that the conical vertex angle of the circular truncated cone shape in the working area is reduced, the length of the working area is increased, the working surface is more gentle, and the wire drawing speed of a steel wire is increased by more than 3 times compared with that of the prior art; compared with the prior art, the number of scraped zinc coating on the surface of the steel wire is reduced by more than 20 percent when the galvanized steel wire is drawn; the abrasion of the steel wire to the mold core is obviously reduced when the steel wire is subjected to drawing processing; the heating value of the steel wire is obviously reduced during drawing, the phenomenon that the drawn steel wire is oxidized due to the rise of heating temperature is effectively avoided, and the strength of the steel wire is increased.

Drawings

Fig. 1 is a schematic structural diagram of a cemented carbide wire drawing die in the prior art.

Fig. 2 is a schematic drawing of the wire drawing working principle of a hard alloy wire drawing die in the prior art.

Fig. 3 is a schematic structural diagram of a hard alloy wire drawing die according to the present invention.

In the figure, 1-mould core, 101-inlet area, 102-working area, 103-sizing area, 104-outlet area, 2-mould sleeve and 3-steel wire.

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention. Referring to the drawings, like numbers indicate like or similar elements throughout the views. The described embodiments are only some, not all embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The first embodiment is as follows:

as shown in fig. 1 to 3, the hard alloy wire drawing die comprises a die core 1, wherein the die core 1 is cylindrical, an inner hole is formed in the center of the die core 1, the inner hole comprises an inlet area 101, a working area 102, a sizing area 103 and an outlet area 104, the inlet area 101 is in the shape of a circular arc surface bell mouth, the working area 102 is in the shape of a circular truncated cone, the sizing area 103 is in the shape of a cylinder, and the outlet area 104 is in the shape of a circular truncated cone; the diameter and height ratio of the mold core 1 is 9-13: 14.

preferably, the diameter D of the mold core 1 is 16-25 mm; the height is 24.9-26.9 mm.

Preferably, the cone vertex angle gamma of the truncated cone shape of the working area 102 is 16-24 degrees. Preferably, the cone vertex angle γ of the truncated cone shape of the working zone 102 is 18 °, 20 °, 22 °.

Preferably, the vertex angle alpha of the circular truncated cone of the outlet area 104 is 20-75 degrees.

When the hard alloy wire drawing die is manufactured, raw material powder with high purity is selected, the raw materials are proportioned according to a specified composition proportion, a medium is added to be wet-milled in a wet ball mill, the raw materials are fully mixed and crushed, a forming agent is added after drying and sieving, and a mixture is prepared after drying and sieving. The mixture is then granulated, compacted and heated to a temperature near the melting point of the binder metal, the hardened phase forming a eutectic alloy with the binder metal. Upon cooling, the hardening phases are distributed in the network of binder metal and are intimately associated with each other to form a solid whole.

Through the test, the mold core 1 is 9-13 according to the diameter to height ratio: 14, selecting a mold core 1 with the diameter D of 16-25mm and the height of 24.9-26.9 mm; meanwhile, the cone vertex angle gamma of the circular truncated cone shape of the working area 102 is set to be 16-24 degrees, and particularly, when the cone vertex angle gamma of the circular truncated cone shape of the working area 102 is set to be 18 degrees, 20 degrees and 22 degrees, the finished product qualification rate of the mold core blank body manufactured in the process of compression molding after the mixture is granulated can reach more than 78%.

Example two:

as shown in fig. 1 to 3, the hard alloy wire drawing die comprises a die core 1, wherein the die core 1 is cylindrical, an inner hole is formed in the center of the die core 1, the inner hole comprises an inlet area 101, a working area 102, a sizing area 103 and an outlet area 104, the inlet area 101 is in the shape of a circular arc surface bell mouth, the working area 102 is in the shape of a circular truncated cone, the sizing area 103 is in the shape of a cylinder, and the outlet area 104 is in the shape of a circular truncated cone; the diameter and height ratio of the mold core 1 is 9-13: 14.

preferably, the diameter D of the mold core 1 is 22 mm; the height is 28 mm.

Preferably, the cone vertex angle gamma of the truncated cone shape of the working area 102 is 20.5-21.5 degrees.

Preferably, the height of the working area 102 is 16-23 mm.

Preferably, the vertex angle alpha of the circular truncated cone of the outlet area 104 is 30-60 degrees.

Through the test, the mold core 1 is 9-13 according to the diameter to height ratio: 14, selecting a mold core 1 with the diameter D of 22mm and the height of 28 mm; meanwhile, when the cone vertex angle gamma of the truncated cone shape of the working area 102 is set to be 20.5-21.5 degrees, the height of the working area 102 is 16-23 mm, and the cone vertex angle alpha of the truncated cone shape of the outlet area 104 is 30-60 degrees, the finished product qualification rate of the mold core blank body manufactured in the process of compression molding after the mixture is granulated can reach more than 87%.

Example three:

as shown in fig. 1 to 3, the hard alloy wire drawing die comprises a die core 1, wherein the die core 1 is cylindrical, an inner hole is formed in the center of the die core 1, the inner hole comprises an inlet area 101, a working area 102, a sizing area 103 and an outlet area 104, the inlet area 101 is in the shape of a circular arc surface bell mouth, the working area 102 is in the shape of a circular truncated cone, the sizing area 103 is in the shape of a cylinder, and the outlet area 104 is in the shape of a circular truncated cone; the diameter and height ratio of the mold core 1 is 9-13: 14.

preferably, the diameter D of the mold core 1 is 22mm, and the height thereof is 28 mm.

Preferably, the cone vertex angle γ of the truncated cone shape of the working area 102 is 20.8 °.

Preferably, the height of the working area 102 is 20.5 mm.

Preferably, the cone vertex angle α of the truncated cone shape of the exit region 104 is 45 °.

Through the test, the mold core 1 is 9-13 according to the diameter to height ratio: 14, selecting a mold core 1 with the diameter D of 22mm and the height of 28 mm; meanwhile, when the cone vertex angle gamma of the truncated cone shape of the working area 102 is set to be 20.8 degrees, the height of the working area 102 is 20.5mm, and the cone vertex angle alpha of the truncated cone shape of the outlet area 104 is 45 degrees, the finished product qualification rate of the mold core blank body manufactured in the process of compression molding after granulating the mixture can reach more than 99%.

Through tests, compared with the traditional wire drawing die, the hard alloy wire drawing die adopting the scheme has the advantages that the drawing speed of the steel wire is increased by more than 3 times compared with the prior art; compared with the prior art, the number of scraped zinc coating on the surface of the steel wire is reduced by more than 20 percent when the galvanized steel wire is drawn; the abrasion of the steel wire to the core is reduced during the steel wire drawing processing; the heating value of the steel wire is reduced during drawing, the phenomenon that the drawn steel wire is oxidized due to the rise of heating temperature is avoided, and the strength of the steel wire is increased.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.