CN210131927U

CN210131927U - Drawing die and drawing device

Info

Publication number: CN210131927U
Application number: CN201921029708.4U
Authority: CN
Inventors: 李华清; 孙晓茜; 崔艳波
Original assignee: Suzhou China Nonferrous Huaren Copper Ltd
Current assignee: Suzhou China Nonferrous Huaren Copper Ltd
Priority date: 2019-07-04
Filing date: 2019-07-04
Publication date: 2020-03-10
Anticipated expiration: 2029-07-04

Abstract

The utility model provides a drawing die and drawing processingequipment relates to and draws technology technical field. The drawing die comprises a die core and a die sleeve, wherein the die core is sleeved in the die sleeve, a gap is reserved between the outer circular surface of the die core and the inner circular surface of the die sleeve, and a die hole in the die core is communicated with the outside through a through hole in a bottom plate of the die sleeve; the bottom of the mold core and the bottom plate of the mold sleeve are connected with balls in a rolling manner; the drawing processing device comprises a fixing device and the drawing die, wherein a die sleeve of the drawing die is detachably and fixedly connected to a fixing seat of the fixing device. The gap capable of being adjusted in position along the radial direction exists between the mold core and the mold sleeve of the drawing mold, the mold core and the mold sleeve bottom plate are connected in a rolling mode through the balls, friction force between the mold core and the mold sleeve is small, relative sliding between the mold core and the mold sleeve bottom plate can be guaranteed, automatic small-amplitude aligning is achieved, mutual damage between the mold core and the mold sleeve bottom plate is reduced, and therefore the service life of the drawing mold is prolonged, and the quality of a drawing product is improved.

Description

Drawing die and drawing device

Technical Field

The utility model relates to a draw technology technical field, especially relate to a drawing die and draw processingequipment.

Background

Drawing is a plastic processing method which uses external force to act on the front end of the metal to be drawn and draws the metal blank out of a die hole smaller than the end face of the blank so as to obtain a product with a corresponding shape and size, wherein, in view of high drawing production efficiency, high strength, large hardness and good product performance of the metal product obtained by drawing, the drawing process is widely applied to the production process of non-ferrous metal wires.

In the drawing process, the die plays a vital role, and whether the design of the die is reasonable or not directly relates to the drawing production efficiency, the product quality and the service life of the die. The existing drawing die generally comprises a die core and a die sleeve, wherein the die core is tightly sleeved in the die sleeve to form a whole, and the die core and the die sleeve cannot move relatively in the radial direction; and the material to be drawn may have a certain curvature, so that when the material to be drawn passes through the forming process of the mold core under the action of the pulling force of the drawing device, one side of the mold inlet is stressed greatly and stress is concentrated, the mold core is damaged greatly, the processing quality of the material to be drawn is reduced, and even the material to be drawn is blocked on the mold core, so that the processing process is interrupted.

Namely, the product quality obtained by drawing of the existing drawing die is poor, and the service life is short.

Disclosure of Invention

An object of the utility model is to provide a drawing die and drawing processingequipment to the drawing die who solves to exist among the prior art draws the product quality who obtains relatively poor, and the short technical problem of life.

The utility model provides a drawing die, including mold core and die sleeve, the mold core cover is located in the die sleeve, and leave the clearance between the outer disc of mold core and the interior disc of die sleeve, the nib on the mold core passes through the through-hole on the die sleeve bottom plate and communicates with the outside; and balls are connected between the bottom of the mold core and the bottom plate of the mold sleeve in a rolling manner.

Furthermore, the ball is a plurality of, and a plurality of the ball is along the circumference of mold core arranges.

Further, a first annular groove is formed in the bottom of the mold core, and the first annular groove and the mold core are arranged in a coaxial manner; a second annular groove is formed in the inner surface of the die sleeve bottom plate, and the second annular groove and the die sleeve are coaxially arranged; the ball clamp is arranged in an annular accommodating cavity formed by the first annular groove and the second annular groove, and the width of the cavity of the annular accommodating cavity is larger than the outer diameter of the ball.

Further, a first annular groove is formed in the bottom of the mold core, and the first annular groove and the mold core are arranged in a coaxial manner; a lower thrust ring is arranged between the mold core and the bottom plate of the mold sleeve, a second annular groove is formed in the surface, facing the mold core, of the lower thrust ring, and the second annular groove and the lower thrust ring are arranged coaxially with the mold sleeve; the ball clamp is arranged in an annular accommodating cavity formed by the first annular groove and the second annular groove, and the width of the cavity of the annular accommodating cavity is larger than the outer diameter of the ball.

Furthermore, an upper push ring is arranged between the mold core and a bottom plate of the mold sleeve, a first annular groove is formed in the bottom of the upper push ring, and the first annular groove and the upper push ring are arranged coaxially with the mold core; a second annular groove is formed in the inner surface of the die sleeve bottom plate, and the second annular groove and the die sleeve are coaxially arranged; the ball clamp is arranged in an annular accommodating cavity formed by the first annular groove and the second annular groove, and the width of the cavity of the annular accommodating cavity is larger than the outer diameter of the ball.

Furthermore, an upper thrust ring and a lower thrust ring are sequentially arranged between the mold core and a bottom plate of the mold sleeve, a first annular groove is formed in the bottom of the upper thrust ring, and the first annular groove and the upper thrust ring are coaxially arranged with the mold core; a second annular groove is formed in the surface, facing the mold core, of the lower thrust ring, and the second annular groove and the lower thrust ring are arranged coaxially with the mold sleeve; the ball clamp is arranged in an annular accommodating cavity formed by the first annular groove and the second annular groove, and the width of the cavity of the annular accommodating cavity is larger than the outer diameter of the ball.

Furthermore, the cross section of the first annular groove is an arc groove body, and the width of the arc groove body is larger than the outer diameter of the ball.

Furthermore, the cross section of the second annular groove is an arc groove body, and the width of the arc groove body is larger than the outer diameter of the ball.

Furthermore, the cross section of the first annular groove and/or the second annular groove is a rectangular groove body, and the width of the rectangular groove body is larger than the outer diameter of the ball.

Another object of the utility model is to provide a drawing processing device, including fixing device and above-mentioned drawing die, the detachable rigid coupling of die sleeve of drawing die in on fixing device's the fixing base.

The utility model discloses drawing die utensil and draw processingequipment's beneficial effect does:

the utility model provides a drawing die and drawing processingequipment, wherein, drawing die includes the mold core that is used for treating drawing material compression molding, is used for protecting the fixed die sleeve of mold core and is used for reducing the frictional force between mold core and the die sleeve bottom plate, makes the ball that the mold core can move relative to the die sleeve, leaves the clearance that supplies the mold core to move along its radial in the die sleeve between the outer disc of the interior disc of die sleeve and mold core; the drawing device comprises a fixing device for fixing and limiting a die sleeve of the drawing die and the drawing die for compression molding of the material to be drawn.

When the drawing device is used, the mold core is concentrically sleeved inside the mold sleeve, the ball is connected between the bottom of the mold core and the bottom plate of the mold sleeve in a rolling mode, the mold sleeve is fixed on the fixing seat of the fixing device and cannot move, a material to be drawn enters from the inlet end of the mold core mold hole, and is drawn out from the drawing end to form a formed product through compression of the mold hole under the action of the pulling force of the drawing chuck. When the straightness of the material to be drawn is good, the drawing chuck tensions the material to be drawn to move linearly along the same axis with the die hole, the material to be drawn is compressed and processed by the die hole and then is formed into a finished product, and the die hole, the die sleeve and the product to be drawn of the die core are in the coaxial state in the process; when the material to be drawn has a certain curvature, when the curved part enters the die hole of the die core, the curved part is not on the same axis with the die hole, so that a larger extrusion force can be caused to one side of the die hole in the process that the curved part enters the die hole, the extrusion force is larger on one side of the die hole, the die core moves along the radial direction of the extrusion force under the action of the extrusion force and the rolling action of the balls, the concentricity between the die hole and the material to be drawn is automatically adjusted in the gap range between the die core and the die sleeve, and therefore when the material to be drawn has the curvature, the extrusion force of the curved part to one side of the die hole and the die core is too large, the die core is damaged, the quality of the drawn product is influenced, and even the material to be drawn is stuck in the die hole and cannot continuously run, and the service life of the die and the quality of the drawn product are correspondingly prolonged.

Namely, a gap which can be subjected to position adjustment along the radial direction exists between the mold core and the mold sleeve of the drawing mold, the mold core and the mold sleeve bottom plate are in rolling connection through balls, friction force between the mold core and the mold sleeve is small, relative sliding between the mold core and the mold sleeve bottom plate can be guaranteed, automatic small-amplitude aligning is achieved, concentricity of the mold core and a material to be drawn is improved, mutual damage between the mold core and the material to be drawn is reduced, and therefore the service life of the drawing mold is prolonged, and the quality of a drawn product is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic cross-sectional view of a drawing die in the prior art;

fig. 2 is a schematic top view of a drawing die according to an embodiment of the present invention;

fig. 3 is a schematic sectional view in the direction of a-a in fig. 2.

Icon: 1-a mold core; 11-die holes; 2-die sleeve; 21-a bottom plate; 3-rolling balls; 4-a first annular groove; 5-a second annular groove; 6-upper thrust ring; 7-a lower thrust ring; 8-gap.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment provides a drawing die, as shown in fig. 2 and fig. 3, which includes a die core 1 and a die sleeve 2, wherein the die core 1 is sleeved in the die sleeve 2, a gap 8 is left between an outer circular surface of the die core 1 and an inner circular surface of the die sleeve 2, and a die hole 11 on the die core 1 is communicated with the outside through a through hole on a bottom plate 21 of the die sleeve 2; the ball 3 is connected between the bottom of the mold core 1 and the bottom plate 21 of the mold sleeve 2 in a rolling way.

The embodiment further provides a drawing device, which comprises a fixing device and the drawing die, wherein the die sleeve 2 of the drawing die is detachably and fixedly connected to the fixing seat of the fixing device.

The drawing die and the drawing device provided by the embodiment comprise a die core 1 for compression molding of a material to be drawn, a die sleeve 2 for protecting and fixing the die core 1, and balls 3 for reducing the friction force between the die core 1 and a bottom plate 21 of the die sleeve 2 to enable the die core 1 to move relative to the die sleeve 2, wherein a gap 8 for enabling the die core 1 to move in the die sleeve 2 along the radial direction is reserved between the inner circular surface of the die sleeve 2 and the outer circular surface of the die core 1; the drawing device comprises a fixing device for fixing and limiting the die sleeve 2 of the drawing die and the drawing die for compression molding of the material to be drawn.

During the use, the mold core 1 is concentrically sleeved inside the mold sleeve 2, the ball 3 is connected between the bottom of the mold core 1 and the bottom plate 21 of the mold sleeve 2 in a rolling manner, the mold sleeve 2 is fixed on a fixing seat of the fixing device and cannot be displaced, a material to be drawn enters from the inlet end of the mold hole 11 of the mold core 1 and is drawn out from the outlet end to form a formed product through compression of the mold hole 11 under the action of the pulling force of the drawing chuck. When the straightness of the material to be drawn is good, the drawing chuck tensions the material to be drawn to move linearly along the same axis with the die hole 11, the material to be drawn is compressed and processed by the die hole 11 to be formed into a finished product, and the die hole 11 of the die core 1, the die sleeve 2 and the product to be drawn are in the same axis state in the process; when the material to be drawn has a certain curvature and the curved part enters the die hole 11 of the die core 1, because the bending part is not on the same axis with the die hole 11, the process that the bending part enters the die hole 11 can cause larger extrusion force to one side of the die hole 11, the extrusion force to one side of the die hole 11 is larger, the mold core 1 is moved in its radial direction toward the direction of the pressing force by the pressing force and the rolling force of the balls 3, the concentricity between the die hole 11 and the material to be drawn is automatically adjusted within the range of the gap 8 between the die core 1 and the die sleeve 2, thereby reducing the overlarge extrusion force of the bent part on the side of the die hole 11 and the die core 1 when the material to be drawn has the bending, the mould core 1 is damaged and the quality of the drawn product is influenced, even the mould core is blocked in the mould hole 11 and can not continue to operate, and accordingly the service life of the mould and the quality of the drawn product are prolonged.

As shown in fig. 1, compared with the prior art, the core 1 in the drawing die is in interference fit inside the die sleeve 2, the core 1 and the die sleeve 2 cannot be radially displaced, when the material to be drawn has a curvature, a large extrusion force is applied to one side of the core 1, the position is concentrated in stress and is easily damaged, and the quality of the drawn product is low; as shown in fig. 2 and 3, a gap 8 capable of being adjusted in position along the radial direction exists between the mold core 1 and the mold sleeve 2 of the drawing mold, the mold core 1 and the bottom plate 21 of the mold sleeve 2 are in rolling connection through the balls 3, the friction force between the mold core 1 and the mold sleeve 2 is small, relative sliding between the mold core 1 and the bottom plate 21 of the mold sleeve 2 can be ensured, automatic small-amplitude centering is realized, the concentricity of the mold core 1 and a material to be drawn is improved, mutual damage between the mold core 1 and the material to be drawn is reduced, and therefore the service life of the drawing mold is prolonged, and the quality of a drawn product is improved.

It should be noted that, the above-mentioned "rolling connection" means that the balls 3 are sandwiched between the bottom of the mold core 1 and the bottom plate 21 of the mold sleeve 2, and the balls 3 can roll between the two, so as to reduce the friction force of the relative movement between the mold core 1 and the bottom plate 21 of the mold sleeve 2; in addition, a gap 8 for the mold core 1 to displace along the radial direction is left between the outer circular surface of the mold core 1 and the inner circular surface of the mold sleeve 2, in practical operation, the distance of the gap 8 is small, which can be understood as the matching of the gap 8 between the mold core 1 and the mold sleeve 2, and the mold core 1 displaces along the radial direction within the range of the gap 8, and here, we can also approximately consider that the mold core 1 and the mold sleeve 2 are arranged coaxially.

In this embodiment, as shown in fig. 2, the number of the balls 3 may be multiple, and the multiple balls 3 are arranged along the circumferential direction of the mold core 1. A plurality of 3 roll connections of ball are between 1 bottom of mold core and 2 bottom plates 21 of die sleeve, draw the in-process, mold core 1 receives the effort of waiting to draw the directional 2 bottom plates 21 directions of die sleeve of material, receive 2 bottom plates 21 of die sleeve simultaneously, the reverse holding power of ball 3, a plurality of balls 3 are arranged along 1 circumference of mold core, support the different positions of 1 bottom circumference of mold core simultaneously, thereby improve the stability of mold core 1 on die sleeve 2, correspondingly improve the concentricity between 1 and the die sleeve 2 of mold core, improve the quality of drawing the product.

Specifically, in the present embodiment, the specific form of the rolling connection of the balls 3 between the bottom of the mold core 1 and the bottom plate 21 of the mold sleeve 2 may include the following form:

in this embodiment, the bottom of the mold core 1 may be provided with a first annular groove 4, and the first annular groove 4 and the mold core 1 are coaxially arranged; a second annular groove 5 is arranged on the inner surface of the bottom plate 21 of the die sleeve 2, and the second annular groove 5 and the die sleeve 2 are coaxially arranged; the ball 3 is clamped in an annular accommodating cavity formed by the first annular groove 4 and the second annular groove 5, and the width of the annular accommodating cavity is larger than the outer diameter of the ball 3. The first annular groove 4 at the bottom of the mold core 1 and the notch of the second annular groove 5 on the inner surface of the bottom plate 21 of the mold sleeve 2 are oppositely arranged to form an annular accommodating cavity, the ball 3 is clamped in the annular accommodating cavity, and the cavity width of the annular accommodating cavity is larger than the outer diameter of the ball 3, so that the ball 3 can roll in the annular accommodating cavity along the circumferential direction and the radial direction (cavity width direction) of the annular accommodating cavity, and meanwhile, the annular accommodating cavity can limit the position of the ball 3 which is in rolling connection between the mold core 1 and the mold sleeve 2, and the support stability of the ball 3 on the mold core 1 is ensured; when the mold core 1 is extruded by a material to be drawn with curvature, the balls 3 can roll within a certain range to realize radial displacement adjustment of the mold core 1 relative to the mold sleeve 2 and realize the automatic aligning of the mold core 1 in the drawing process to adapt to the material to be drawn, thereby reducing the damage to the mold core 1 and the material to be drawn caused by the curvature of the material to be drawn in the drawing process, correspondingly prolonging the service life of the drawing mold and improving the quality of the drawn product.

In this embodiment, a first annular groove 4 may also be provided at the bottom of the mold core 1, and the first annular groove 4 and the mold core 1 are coaxially arranged; a lower thrust ring 7 is arranged between the die core 1 and a bottom plate 21 of the die sleeve 2, a second annular groove 5 is arranged on the surface of the lower thrust ring 7 facing the die core 1, and the second annular groove 5 and the lower thrust ring 7 are coaxially arranged with the die sleeve 2; the ball 3 is clamped in an annular accommodating cavity formed by the first annular groove 4 and the second annular groove 5, and the width of the annular accommodating cavity is larger than the outer diameter of the ball 3. Here, the first annular groove 4 is provided at the bottom of the mold core 1, and the second annular groove 5 is provided on the lower thrust collar 7 to form a specific form of annular receiving cavity, and the working principle is similar to the principle described above, and is not described again here. Wherein, on thrust ring 7 was located down to second ring channel 5, played 3 direction spacing to the ball, on the basis that makes ball 3 can normally work, reduced directly set up the destruction that the cell body caused to die sleeve 2 bottom plate 21 intensity etc. on die sleeve 2 bottom plate 21 to further prolong drawing die's life.

In this embodiment, an upper push ring 6 may be further disposed between the mold core 1 and the bottom plate 21 of the mold sleeve 2, a first annular groove 4 is disposed at the bottom of the upper push ring 6, and the first annular groove 4 and the upper push ring 6 are both disposed coaxially with the mold core 1; a second annular groove 5 is arranged on the inner surface of the bottom plate 21 of the die sleeve 2, and the second annular groove 5 and the die sleeve 2 are coaxially arranged; the ball 3 is clamped in an annular accommodating cavity formed by the first annular groove 4 and the second annular groove 5, and the width of the annular accommodating cavity is larger than the outer diameter of the ball 3. The first annular groove 4 is arranged on the upper push ring 6, the second annular groove 5 is arranged on the bottom plate 21 of the die sleeve 2 to form an annular accommodating cavity, friction force exists between the bottom of the die core 1 and the upper surface of the upper push ring 6, when the die core 1 is extruded by a single side of a material to be drawn, the die core 1 and the upper push ring 6 synchronously displace along the radial direction, and the balls 3 roll and support in the annular accommodating cavity, so that the automatic centering of the die core 1 is realized. On one hand, the second annular groove 5 is arranged on the upper push ring 6, so that on the basis of guiding and limiting the balls 3 and enabling the balls 3 to work normally, damage to the strength of the mold core 1 and the like caused by directly arranging the groove body on the mold core 1 can be effectively reduced, the stress strength of the mold core 1 is improved, and the service life of the mold core is prolonged; on the other hand, the ball 3 exerts a supporting acting force on the upper push ring 6, the upper push ring 6 transmits the supporting acting force to the bottom of the mold core 1, the whole upper surface of the upper push ring 6 interacts with the bottom of the mold core 1, and the acting area is far larger than the point contact area of the ball 3 when supporting the mold core 1, so that the stress uniformity of the mold core 1 is improved, the occurrence of damage caused by overlarge local stress is reduced, and the service lives of the mold core 1 and the stretching mold are further prolonged.

In this embodiment, as shown in fig. 3, an upper thrust ring 6 and a lower thrust ring 7 may be further sequentially disposed between the mold core 1 and the bottom plate 21 of the mold sleeve 2, a first annular groove 4 is disposed at the bottom of the upper thrust ring 6, and the first annular groove 4 and the upper thrust ring 6 are both disposed coaxially with the mold core 1; a second annular groove 5 is formed in the surface, facing the mold core 1, of the lower thrust ring 7, and the second annular groove 5 and the lower thrust ring 7 are coaxially arranged with the mold sleeve 2; the ball 3 is clamped in an annular accommodating cavity formed by the first annular groove 4 and the second annular groove 5, and the width of the annular accommodating cavity is larger than the outer diameter of the ball 3. The first annular groove 4 is arranged on the upper thrust ring 6, the second annular groove 5 is arranged on the lower thrust ring 7, the upper thrust ring 6, the lower thrust ring 7 and the balls 3 can approximately form a thrust bearing to support the mold core 1, and the mold core 1 can synchronously and radially move with the upper thrust ring 6 when being stressed, so that automatic centering is realized; the arrangement of the upper thrust ring 6 and the lower thrust ring 7 can reduce the strength damage caused by directly arranging groove bodies on the die core 1 and the die sleeve 2, thereby improving the overall strength of the drawing die and prolonging the service life of the drawing die; meanwhile, the stability of the ball 3 for supporting the mold core 1 can be improved, and the service life of the mold core 1 is further prolonged.

Specifically, in this embodiment, as shown in fig. 3, the cross section of the first annular groove 4 may be an arc groove body, and the width of the arc groove body is greater than the outer diameter of the ball 3; the cross section of the second annular groove 5 is an arc groove body, and the width of the arc groove body is larger than the outer diameter of the ball 3. First ring channel 4 and second ring channel 5 are the arc cell body, ball 3 inlays and holds the intracavity in the annular that both formed, when mold core 1 received unilateral extrusion force, ball 3 can hold the chamber along its radial (the width direction of arc cell body) roll at the annular along with the motion trend of first ring channel 4, thereby reduce the frictional force of the relative die sleeve 2 radial motion of mold core 1, guarantee that mold core 1 can smoothly radial movement carries out the aligning when receiving the extrusion force of waiting to draw the material, thereby reduce the damage that causes each other between the two.

In addition to the first annular groove 4 and the second annular groove 5 having arc-shaped cross sections, in this embodiment, the cross section of the first annular groove 4 and/or the second annular groove 5 may also be a rectangular groove body, and the width of the rectangular groove body is greater than the outer diameter of the ball 3. When the first annular groove 4 and the second annular groove 5 are rectangular groove bodies, the width of the rectangular groove bodies is the radial rolling stroke range of the ball 3, and correspondingly the radial displacement range of the mold core 1, and the working principle of the rectangular groove bodies is described in detail above, and is not described again here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims

1. The drawing die is characterized by comprising a die core (1) and a die sleeve (2), wherein the die core (1) is sleeved in the die sleeve (2), a gap (8) is reserved between the outer circular surface of the die core (1) and the inner circular surface of the die sleeve (2), and a die hole (11) in the die core (1) is communicated with the outside through a through hole in a bottom plate (21) of the die sleeve (2); and balls (3) are connected between the bottom of the mold core (1) and the bottom plate (21) of the mold sleeve (2) in a rolling manner.

2. Drawing die as claimed in claim 1, characterised in that said balls (3) are in plurality, said balls (3) being arranged along the circumference of said core (1).

3. Drawing die according to claim 1, characterised in that the bottom of the die core (1) is provided with a first annular groove (4), the first annular groove (4) being arranged coaxially with the die core (1); a second annular groove (5) is formed in the inner surface of a bottom plate (21) of the die sleeve (2), and the second annular groove (5) and the die sleeve (2) are coaxially arranged; the ball (3) is clamped in an annular accommodating cavity formed by the first annular groove (4) and the second annular groove (5), and the width of the cavity of the annular accommodating cavity is larger than the outer diameter of the ball (3).

4. Drawing die according to claim 1, characterised in that the bottom of the die core (1) is provided with a first annular groove (4), the first annular groove (4) being arranged coaxially with the die core (1); a lower thrust ring (7) is arranged between the mold core (1) and a bottom plate (21) of the mold sleeve (2), a second annular groove (5) is formed in the surface, facing the mold core (1), of the lower thrust ring (7), and the second annular groove (5) and the lower thrust ring (7) are coaxially arranged with the mold sleeve (2); the ball (3) is clamped in an annular accommodating cavity formed by the first annular groove (4) and the second annular groove (5), and the width of the cavity of the annular accommodating cavity is larger than the outer diameter of the ball (3).

5. The drawing die according to claim 1, characterized in that an upper push-up ring (6) is arranged between the die core (1) and the bottom plate (21) of the die sleeve (2), a first annular groove (4) is arranged at the bottom of the upper push-up ring (6), and the first annular groove (4) and the upper push-up ring (6) are coaxially arranged with the die core (1); a second annular groove (5) is formed in the inner surface of a bottom plate (21) of the die sleeve (2), and the second annular groove (5) and the die sleeve (2) are coaxially arranged; the ball (3) is clamped in an annular accommodating cavity formed by the first annular groove (4) and the second annular groove (5), and the width of the cavity of the annular accommodating cavity is larger than the outer diameter of the ball (3).

6. The drawing die according to claim 1, characterized in that an upper thrust ring (6) and a lower thrust ring (7) are sequentially arranged between the die core (1) and the bottom plate (21) of the die sleeve (2), a first annular groove (4) is arranged at the bottom of the upper thrust ring (6), and the first annular groove (4) and the upper thrust ring (6) are coaxially arranged with the die core (1); a second annular groove (5) is formed in the surface, facing the mold core (1), of the lower thrust ring (7), and the second annular groove (5) and the lower thrust ring (7) are coaxially arranged with the mold sleeve (2); the ball (3) is clamped in an annular accommodating cavity formed by the first annular groove (4) and the second annular groove (5), and the width of the cavity of the annular accommodating cavity is larger than the outer diameter of the ball (3).

7. Drawing die according to any of claims 3-6, characterised in that the cross section of the first annular groove (4) is an arc groove, the width of which is greater than the outer diameter of the balls (3).

8. Drawing die according to any of claims 3-6, characterised in that the cross section of the second annular groove (5) is an arc groove, the width of which is greater than the outer diameter of the balls (3).

9. Drawing die according to any of claims 3-6, characterised in that the cross section of the first annular groove (4) and/or the second annular groove (5) is a rectangular groove with a width larger than the outer diameter of the balls (3).

10. Drawing processing device, characterized in that, including fixing device and the drawing die of any claim 1-9, the die sleeve (2) of the drawing die is detachably and fixedly connected to the fixing seat of the fixing device.