A sintering preparation device and manufacturing method for a wire drawing die sleeve

Abstract

The present invention provides a sintering preparation device and manufacturing method for a wire drawing die sleeve, which specifically relates to the technical field of wire drawing dies, including a steel die, a die cavity is provided on the steel die, a single layer of metal powder is laid on the inner bottom surface of the die cavity, polycrystalline diamond is placed in the center of the die cavity and on the single layer of metal powder, the die cavity is filled with metal powder, the metal powder is coated on the outside of the polycrystalline diamond, and the lower end surface of the steel die is pre-processed with a bottom hole; it also includes a die plugging structure coaxially arranged in the center of the die cavity, a pressing structure arranged at the top of the metal powder, the pressing structure is connected to the die plugging structure, the die plugging structure is arranged directly above the polycrystalline diamond, and the pressing structure is arranged directly above the die plugging structure. The present invention provides a sintering preparation device and manufacturing method for a wire drawing die sleeve, which realizes the positioning and protection of polycrystalline diamond in the process of producing the wire drawing die sleeve, and greatly reduces the amount of mechanical processing after the preparation is completed.

Description

Technical Field

[0001] The invention relates to the technical field of wire drawing dies, and in particular to a sintering preparation device and a manufacturing method for a wire drawing die sleeve. Background Art

[0002] The drawing die generally refers to the wire drawing die. Before grinding and polishing, the wire drawing die is fixed next to the insert sleeve. The service life of the wire drawing die is closely related to the quality of the insert sleeve. Especially when drawing large diameter and hard materials, the quality of the insert sleeve is more important. Under the actual drawing temperature, the die blank must be firmly fixed in the insert sleeve to ensure that the cemented carbide has a long service life.

[0003] However, in the production process of wire drawing die sleeves, there are the following technical problems:

[0004] (1) Polycrystalline diamond is increasingly favored by the wire drawing die industry for its high hardness, high wear resistance and excellent cost performance. The existing technology mainly adopts the powder metallurgy inlay method to prepare the polycrystalline diamond wire drawing die insert. Since the polycrystalline diamond is sintered under high temperature and high pressure, it is necessary to position the insert and the polycrystalline diamond inside it as a whole. However, the irregular shape of the polycrystalline diamond is easy to cause inaccurate positioning and difficult to control the shape. During positioning, it is easy to damage the wire drawing die due to excessive external force, and the shape of the sintered polycrystalline diamond is generally not very regular.

[0005] (2) The current wire drawing die generally pressurizes the polycrystalline diamond before sintering, which will cause slight damage to the polycrystalline diamond. However, if pressure is applied when the alloy powder is in a semi-molten state, this problem can be effectively solved;

[0006] (3) In the prior art, after the wire drawing die sleeve is prepared, it is necessary to perform mechanical drilling on the wire drawing die sleeve, which is time-consuming, labor-intensive and troublesome.

[0007] Therefore, the present invention provides a sintering preparation device and manufacturing method for a wire drawing die sleeve, which are used to solve the above-mentioned technical problems at the same time. Summary of the invention

[0008] The purpose of the present invention is to provide a sintering preparation device and manufacturing method for a wire drawing die sleeve, which solves the technical problem of positioning polycrystalline diamond in the process of producing wire drawing die sleeves, and also achieves the technical effect of protecting polycrystalline diamond, greatly reducing the amount of mechanical processing after preparation.

[0009] A sintering preparation device for a wire drawing die sleeve comprises a steel die, wherein the upper end surface of the steel die is provided with a die cavity, a single layer of metal powder is laid on the inner bottom surface of the die cavity, polycrystalline diamond is placed in the center of the die cavity and on the single layer of metal powder, the interior of the die cavity is filled with metal powder, the metal powder covers the outside of the polycrystalline diamond, and a bottom hole is pre-machined on the lower end surface of the steel die; the device also comprises a die plugging structure coaxially arranged in the center of the die cavity, a pressing structure arranged at the top of the metal powder, the pressing structure is connected to the die plugging structure, the die plugging structure is arranged directly above the polycrystalline diamond, and the pressing structure is arranged directly above the die plugging structure.

[0010] The mold plugging structure includes a conical cylinder with its large end facing upward and its small end facing downward, a closing plate fixedly sealed on the inner side of the small end of the conical cylinder, and a column with a vertical bottom end and threadedly connected to the center of the closing plate. The top of the column is connected to a pressing structure. The conical cylinder is arranged directly above the polycrystalline diamond. The conical cylinder is shell-shaped and has an opening at the large end.

[0011] The pressing structure includes a pressing block and a pressing assembly for driving the pressing block to move downward, wherein the pressing block is arranged at the top of the metal powder;

[0012] The pressing assembly comprises limit blocks respectively fixed at both ends above the steel mold, a sliding rod horizontally passing through the limit blocks, and a fastening screw passing through the outer end of the sliding rod;

[0013] The sliding rod includes a horizontal portion, a vertical portion vertically fixed at one end of the horizontal portion, a protruding block vertically fixed below the other end of the horizontal portion, and a wedge block fixed at the bottom side of the horizontal portion. The wedge block is engaged with the pressure block, and the lower end of the protruding block is attached to the inner side of the conical cylinder.

[0014] A limiting rod is arranged on the upper end surface of the pressing block, one end of the limiting rod is fixedly connected to the top of the pressing block, and the other end of the limiting rod is arranged with a positioning hole, through which the top end of the column passes.

[0015] A scale bar is vertically fixed on the outer side of the pressing block.

[0016] End blocks are fixed on both sides and both ends of the steel mold respectively, and movable bolts are vertically penetrated through the end blocks, and the small heads of the movable bolts are provided with chamfered corners.

[0017] The polycrystalline diamond is coaxially processed with an upper conical hole, a micro hole and a lower conical hole in sequence from top to bottom, and the upper conical hole is coaxially arranged with the column.

[0018] A sintering manufacturing method for a wire drawing die sleeve specifically comprises the following steps:

[0019] Step S1: metal powders are prepared as follows by mass percentage: 30-35wt% Zn powder, 25-35wt% Al powder, 5-10wt% Sn powder, 1-2wt% Mg powder, 15-20wt% Ni powder, 5-10wt% Pb powder and 2-8wt% Fe powder, the particle size of the metal powders is 150 mesh, and the metal powders are mixed evenly after preparation;

[0020] Step S2: firstly lay a layer of metal powder on the bottom surface of the cavity of the steel mold, place the polycrystalline diamond in the center of the cavity, and then continue to lay the metal powder to cover the polycrystalline diamond;

[0021] A mold plugging structure is placed above the polycrystalline diamond. If there is a gap between the mold plugging structure and the inner side of the mold cavity, metal powder is filled in the gap, the metal powder is vibrated to be flat, and the metal powder is compacted; thus, the polycrystalline diamond is fixed at the center position of the lower end of the steel mold;

[0022] Step S3: placing a pressing structure on the top of the steel mold and directly above the mold plugging structure, and pressing it on the top of the metal powder;

[0023] Step S4: Finally, hot pressing and sintering, the parameters are as follows: the temperature is raised to 420-440°C under a pressure of 2-3 MPa and kept for 16-25 minutes, the pressure is increased to 5-5.8 MPa, the temperature is then raised to 600-630°C and kept for 30-42 minutes, and the pressure is then reduced to 2-2.5 MPa and the temperature is lowered to 260-280°C and kept for 15-20 minutes, so that the steel mold, polycrystalline diamond, and metal powder are sintered into one to form a polycrystalline diamond wire drawing die insert, and the metal powder will be sintered into an inclusion, and finally cooled to room temperature and taken out;

[0024] Step S5: remove the excess material on the sleeve, expose the upper and lower ends of the polycrystalline diamond, perform laser hole expansion processing on the polycrystalline diamond, and process the polycrystalline diamond 12 from top to bottom into an upper tapered hole 122, a micro hole 121 and a lower tapered hole 123, and shape and polish them.

[0025] The metal powders are prepared in percentage by mass as follows: 30 wt % Zn powder, 25 wt % Al powder, 5 wt % Sn powder, 2 wt % Mg powder, 20 wt % Ni powder, 10 wt % Pb powder and 8 wt % Fe powder.

[0026] The metal powders are prepared in percentage by mass as follows: 35 wt % Zn powder, 25 wt % Al powder, 10 wt % Sn powder, 2 wt % Mg powder, 15 wt % Ni powder, 5 wt % Pb powder and 8 wt % Fe powder.

[0027] The present invention has the following beneficial effects:

[0028] (1) This scheme is provided with a mold blocking structure, which has the following technical effects:

[0029] First, the steel mold is pre-processed with a mold cavity and matched with a conical cylinder. The conical cylinder is used to isolate the polycrystalline diamond from the external air. After sintering, the inner bottom end of the conical cylinder can be processed, that is, the material of the closing plate is removed to expose the upper end of the polycrystalline diamond, avoiding the disadvantage of large-scale cutting of the inclusion in the past, greatly reducing the workload;

[0030] The second is to connect the limit rod with the column, so that the pressing block can always be in a horizontal state under the guidance of the column, ensuring that the metal powder is evenly pressed downward;

[0031] Third, the irregular dimensions of polycrystalline diamond can easily lead to inaccurate positioning and difficult to control dimensions. During positioning, the conical cylinder is pressed on the top of the polycrystalline diamond. Combined with the viscosity of the powder sintered body, the wire drawing die will not be damaged due to excessive external force, and the position of the polycrystalline diamond is not easy to change. Due to good sealing, the oxidation shape of the polycrystalline diamond is avoided, and the overall shape is also relatively regular.

[0032] (2) Setting up a pressing structure has the following technical effects:

[0033] First, a pressure block is set on the top of the metal powder to achieve slight pressure on the metal powder and polycrystalline diamond, while ensuring the close combination of the internal structure, avoiding damage to the brittle mold core such as polycrystalline diamond. In addition to polycrystalline diamond, the mold core here also includes a mold plugging structure;

[0034] Second, when the metal powder is in a semi-molten state, the fastening screw is rotated to make the sliding rod slide outward, and the wedge-shaped block evenly applies pressure to the pressing block. With the deadweight of the pressing block itself, the internal structure of the metal powder is further compacted, and the metal powder and the polycrystalline diamond are more tightly combined.

[0035] (3) Pre-processing the bottom hole at the bottom of the steel mold so that the bottom hole is coaxial with the tapered cylinder above. After sintering is completed, it is helpful to quickly process the micro-holes of the polycrystalline diamond, avoiding the dimensional error caused by direct cutting of the insert in the past;

[0036] (4) By adopting this technical solution, after the wire drawing die sleeve is processed, the workload of cutting, drilling and other processing on the wire drawing die sleeve is greatly reduced. The bottom hole has been pre-processed and formed, and only the perforation, lower tapered hole, upper tapered hole and micro hole need to be processed, which greatly reduces the workload and helps protect the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1This is a schematic diagram of the structure of the sintering preparation device in Example 1 of the present invention.

[0038] Figure 2 It is a schematic diagram of the connection structure of the pressing structure and the mold blocking structure in Example 1 of the present invention.

[0039] Figure 3 It is a partial structural schematic diagram of the mold blocking structure in Example 1 of the present invention.

[0040] Figure 4 It is a partial structural schematic diagram of the pressing assembly in Example 1 of the present invention.

[0041] Figure 5 This is a schematic diagram of the connection structure of the pressing block in Example 1 of the present invention.

[0042] Figure 6 It is a schematic diagram of the central cross-section of the steel mold, the inclusion body and the conical cylinder in Example 1 of the present invention.

[0043] Figure 7 Schematic diagram of the position structure of the microholes, upper tapered holes and lower tapered holes in Example 1 of the present invention.

[0044] Among them, the figure markings are: 1. end block; 2. movable bolt; 3. steel mold; 31. bottom hole; 32. through hole; 4. pressure block; 41. limit groove; 43. semicircular surface; 5. scale bar; 6. limit block; 7. fastening screw; 71. top plate; 8. sliding rod; 81. wedge block; 82. protruding block; 9. limit rod; 10. column; 101. closing plate; 11. conical cylinder; 111. inclusion; 12. polycrystalline diamond; 121. micropore; 122. upper conical hole; 123. lower conical hole. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0046] Embodiment 1:

[0047] See also Figure 1-Figure 7 A sintering preparation device for a wire drawing die insert comprises a steel die 3, the upper end surface of the steel die 3 is provided with a die cavity, a single layer of metal powder is laid on the inner bottom surface of the die cavity, polycrystalline diamond 12 is placed on the center of the die cavity and on the single layer of metal powder, the die cavity is filled with metal powder, the metal powder is coated on the outer side of the polycrystalline diamond 12, and a bottom hole 31 is pre-processed on the lower end surface of the steel die 3;

[0048] It also includes a mold plugging structure coaxially arranged in the center of the mold cavity and a pressing structure arranged at the top of the metal powder. The pressing structure is connected to the mold plugging structure. The mold plugging structure is arranged directly above the polycrystalline diamond 12, and the pressing structure is arranged directly above the mold plugging structure.

[0049] The mold plugging structure includes a conical cylinder 11 arranged with its large end facing upward and its small end facing downward, a closing plate 101 fixedly sealed on the inner side of the small end of the conical cylinder 11, and a column 10 with a vertical bottom end and threadedly connected to the center of the closing plate 101. The top of the column 10 is connected to the pressing structure. The conical cylinder 11 is arranged directly above the polycrystalline diamond 12. The conical cylinder 11 is shell-shaped and has an opening at the large end.

[0050] It should be noted that an external thread is provided at the bottom end of the column 10, and a threaded blind hole is provided on the upper end surface of the closing plate 101. The external thread on the column 10 is fixedly connected to the threaded blind hole, which is convenient for subsequent disassembly. After the overall sintering of the insert is completed, the processing and material removal of the closing plate 101 is also convenient and quick. The function of the closing plate 101 is to isolate the polycrystalline diamond 12 from the external air.

[0051] The pressing structure includes a pressing block 4 and a pressing assembly for driving the pressing block 4 to move downward, and the pressing block 4 is arranged on the top of the metal powder;

[0052] The pressing assembly includes limit blocks 6 respectively fixed at both ends of the upper side of the steel mold 3, a sliding rod 8 horizontally passing through the limit blocks 6, and a fastening screw 7 passing through the outer end of the sliding rod 8;

[0053] The sliding rod 8 includes a horizontal portion, a vertical portion vertically fixed at one end of the horizontal portion, a protruding block 82 vertically fixed below the other end of the horizontal portion, and a wedge block 81 fixed to the bottom side of the horizontal portion. The wedge block 81 is snap-connected with the pressing block 4, and the lower end of the protruding block 82 is attached to the inner side of the conical cylinder 11.

[0054] More preferably, a top plate 71 is provided at one end of the fastening screw 7 , and the top plate 71 is embedded in a limiting hole provided on the steel mold 3 .

[0055] Specifically, a limiting groove 41 is provided on the pressing block 4, which contacts the bottom end of the wedge block 81. The inner bottom surface of the limiting groove 41 is an inclined surface. The contact point between the two pressing blocks 4 is a semicircular surface 43. The two semicircular surfaces 43 are in contact with the outer side surface of the conical cylinder 11. The same curvature ensures that no displacement occurs between the semicircular surfaces 43 and the conical cylinder 11.

[0056] A limit rod 9 is provided on the upper end surface of the pressing block 4, one end of the limit rod 9 is fixedly connected above the pressing block 4, and the other end of the limit rod 9 is provided with a positioning hole, and the top end of the column 10 passes through the positioning hole.

[0057] A scale bar 5 is vertically fixed on the outer side of the pressing block 4 to facilitate people to observe the descending height of the pressing block 4.

[0058] End blocks 1 are fixed to both sides and ends of the steel mold 3 , respectively. A movable bolt 2 is vertically passed through the end block 1 , and the small head of the movable bolt 2 is provided with a chamfered corner.

[0059] It should be noted that a bottom hole 31 is pre-processed at the bottom end of the steel mold 3, and the bottom hole 31 is coaxially arranged with the column 10. Considering that the mechanical properties of the mold are improved after sintering, the bottom hole 31 is pre-processed at the bottom end of the steel mold 3 to avoid damage to the tool during subsequent mold processing; the bottom hole 31 can be cylindrical, conical, etc.

[0060] The polycrystalline diamond 12 is coaxially processed with an upper tapered hole 122 , a micro hole 121 and a lower tapered hole 123 in sequence from top to bottom. The upper tapered hole 122 is coaxially arranged with the column 10 .

[0061] The specific working process of the present invention is as follows:

[0062] First, the steel mold 3 is pre-processed to form a mold cavity and a bottom hole 31 of the steel mold 3, metal powder is laid on the inner bottom surface of the mold cavity, and the polycrystalline diamond 12 is arranged on the metal powder on the inner bottom surface, and the metal powder is continuously laid, and the metal powder buries the polycrystalline diamond 12;

[0063] At this time, the bottom end of the conical tube 11 is pressed on the metal powder and is located directly above the polycrystalline diamond 12 .

[0064] If there is space between the conical cylinder 11 and the inner side of the mold cavity, fill the space between the conical cylinder 11 and the steel mold 3 with metal powder until it is full, and vibrate and flatten the top of the metal powder. At this time, the top of the column 10 is exposed at the top of the metal powder.

[0065] The pressing block 4 is placed, and the tightening screw 7 is screwed, so that the bottom end of the protruding block 82 is fitted against the inner end of the conical tube 11 , so as to realize the support and alignment of the inner side of the conical tube 11 .

[0066] The whole is placed in a heating furnace for sintering. When the metal powder is half melted, the heating furnace is opened, and the fastening screw 7 is manually screwed by a tool to make the pressing block 4 descend, and the scale bar 5 is observed to determine the pressing size.

[0067] When sintering is completed, the entire device is taken out and cooled, and then the column 10 (the column 10 is connected to the center thread of the closing plate 101) is disassembled, and the bottom end of the conical cylinder 11 is machined to remove the material, specifically, the closing plate 101 is machined to remove;

[0068] At this time, the upper end of the polycrystalline diamond 12 is exposed, and laser hole expansion is used to first process the upper end of the polycrystalline diamond 12 into a conical hole 122 and a micropore 121, thereby reducing the workload of removing material from the inclusion 111 that was previously required. It should be noted that the inclusion 111, the polycrystalline diamond 12 and the mold plugging structure in this solution are combined to form a polycrystalline block.

[0069] Finally, a through hole 32 is processed at the center of the bottom hole 31 to expose the bottom end of the polycrystalline diamond 12. The bottom end of the polycrystalline diamond 12 is then processed to remove material to form a lower conical hole 123. Finally, the lower conical hole 123 is interconnected with the microhole 121 and the upper conical hole 122. When in use, the wire drawing passes through the upper conical hole 122, the microhole 121, the lower conical hole 123, the through hole 32 and the bottom hole 31 in sequence.

[0070] Embodiment 2:

[0071] A sintering manufacturing method for a wire drawing die sleeve specifically comprises the following steps:

[0072] Step S1: metal powders are prepared as follows by mass percentage: 30-35wt% Zn powder, 25-35wt% Al powder, 5-10wt% Sn powder, 1-2wt% Mg powder, 15-20wt% Ni powder, 5-10wt% Pb powder and 2-8wt% Fe powder, the particle size of the metal powders is 150 mesh, and the metal powders are mixed evenly after preparation;

[0073] Step S2: firstly lay a layer of metal powder on the bottom surface of the cavity of the steel mold 3, place the polycrystalline diamond 12 in the center of the cavity, and then continue to lay the metal powder to cover the polycrystalline diamond 12;

[0074] A mold plugging structure is placed above the polycrystalline diamond 12. If there is a gap between the mold plugging structure and the inner side of the mold cavity, metal powder is filled in the gap, and the metal powder is vibrated to be flat and compacted; thus, the polycrystalline diamond 12 is fixed at the center position of the lower end of the steel mold 3;

[0075] Step S3: placing a pressing structure on the top of the steel mold 3 and directly above the mold plugging structure, and pressing it on the top of the metal powder;

[0076] Step S4: Finally, hot pressing and sintering, the parameters are as follows: the temperature is raised to 420-440°C under a pressure of 2-3 MPa and kept for 16-25 minutes, the pressure is increased to 5-5.8 MPa, the temperature is then raised to 600-630°C and kept for 30-42 minutes, and the pressure is then reduced to 2-2.5 MPa and the temperature is lowered to 260-280°C and kept for 15-20 minutes, so that the steel mold 3, the polycrystalline diamond 12, and the metal powder are sintered into one to form a polycrystalline diamond 12 wire drawing die insert, and the metal powder will be sintered into an inclusion 111, and finally cooled to room temperature and taken out;

[0077] Step S5: remove the excess material on the sleeve, expose the upper and lower ends of the polycrystalline diamond 12, perform laser hole expansion processing on the polycrystalline diamond 12, and process the polycrystalline diamond 12 from top to bottom into an upper tapered hole 122, a micro hole 121 and a lower tapered hole 123, and finally shape and polish.

[0078] The metal powders were prepared in percentage by mass as follows: 30 wt % Zn powder, 25 wt % Al powder, 5 wt % Sn powder, 2 wt % Mg powder, 20 wt % Ni powder, 10 wt % Pb powder and 8 wt % Fe powder.

[0079] The metal powders were prepared in percentage by mass as follows: 35 wt % Zn powder, 25 wt % Al powder, 10 wt % Sn powder, 2 wt % Mg powder, 15 wt % Ni powder, 5 wt % Pb powder and 8 wt % Fe powder.

[0080] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A sintering preparation device for a wire drawing die sleeve, comprising a steel die (3), wherein the upper end surface of the steel die (3) is provided with a die cavity, characterized in that: A single layer of metal powder is laid on the inner bottom surface of the mold cavity, a polycrystalline diamond (12) is placed in the center of the mold cavity and on the single layer of metal powder, the interior of the mold cavity is filled with metal powder, the metal powder covers the outside of the polycrystalline diamond (12), and a bottom hole (31) is pre-processed on the lower end surface of the steel mold (3); It also includes a mold plugging structure coaxially arranged at the center of the mold cavity, and a pressing structure arranged at the top of the metal powder, the pressing structure is connected to the mold plugging structure, the mold plugging structure is arranged directly above the polycrystalline diamond (12), and the pressing structure is arranged directly above the mold plugging structure; The mold plugging structure comprises a conical cylinder (11) arranged with its large end facing upward and its small end facing downward, a closing plate (101) fixedly closing the inner side of the small end of the conical cylinder (11), and a column (10) with a vertical bottom end and threadedly connected to the center of the closing plate (101), the top of the column (10) being connected to a press-fit structure, the conical cylinder (11) being arranged directly above the polycrystalline diamond (12), the conical cylinder (11) being shell-shaped and having an opening at its large end; The pressing structure comprises a pressing block (4) and a pressing assembly for driving the pressing block (4) to move downward, wherein the pressing block (4) is arranged at the top of the metal powder; The pressing assembly comprises limit blocks (6) respectively fixed at two ends above the steel mold (3), a sliding rod (8) horizontally passing through the limit blocks (6), and a fastening screw (7) passing through the outer end of the sliding rod (8); The sliding rod (8) comprises a horizontal portion, a vertical portion vertically fixed to one end of the horizontal portion, a protruding block (82) vertically fixed below the other end of the horizontal portion, and a wedge-shaped block (81) fixed to the bottom side of the horizontal portion, the wedge-shaped block (81) being snap-fitted and connected to the pressing block (4), and the lower end of the protruding block (82) being fitted to the inner side of the conical cylinder (11); A limiting rod (9) is provided on the upper end surface of the pressing block (4), one end of the limiting rod (9) is fixedly connected to the top of the pressing block (4), and the other end of the limiting rod (9) is provided with a positioning hole, and the top end of the column (10) passes through the positioning hole; A scale bar (5) is vertically fixed on the outer side of the pressing block (4).

2. The sintering preparation device for a wire drawing die sleeve according to claim 1, characterized in that: End blocks (1) are fixed to both sides and ends of the steel mould (3), respectively, and movable bolts (2) are vertically passed through the end blocks (1), and the small heads of the movable bolts (2) are provided with rounded corners.

3. The sintering preparation device for a wire drawing die sleeve according to claim 1, characterized in that: The polycrystalline diamond (12) is coaxially processed with an upper conical hole (122), a micro hole (121) and a lower conical hole (123) in sequence from top to bottom, and the upper conical hole (122) is coaxially arranged with the column (10).

4. A sintering method for manufacturing a wire drawing die insert, using the sintering device for manufacturing a wire drawing die insert as claimed in any one of claims 1 to 3, characterized in that: The specific steps include: Step S1: metal powders are prepared as follows by mass percentage: 30-35wt% Zn powder, 25-35wt% Al powder, 5-10wt% Sn powder, 1-2wt% Mg powder, 15-20wt% Ni powder, 5-10wt% Pb powder and 2-8wt% Fe powder, the particle size of the metal powders is 150 mesh, and the metal powders are mixed evenly after preparation; Step S2: firstly, laying a layer of metal powder on the bottom surface of the cavity of the steel mold (3), placing the polycrystalline diamond (12) at the center of the cavity, and then continuing to lay the metal powder to cover and wrap the polycrystalline diamond (12); A mold plugging structure is placed directly above the polycrystalline diamond (12). If there is a gap between the mold plugging structure and the inner side of the mold cavity, metal powder is filled in the gap, the metal powder is vibrated to be flat, and the metal powder is compacted, so that the polycrystalline diamond (12) is fixed at the center position of the lower end of the steel mold (3); Step S3: placing a pressing structure on the top of the steel mold (3) and directly above the mold plugging structure, and pressing it on the top of the metal powder; Step S4: Finally, hot pressing and sintering, the parameters are as follows: heating to 420-440°C at a pressure of 2-3 MPa and keeping the temperature for 16-25 minutes, increasing the pressure to 5-5.8 MPa and then heating to 600-630°C and keeping the temperature for 30-42 minutes, then reducing the pressure to 2-2.5 MPa and cooling to 260-280°C and keeping the temperature for 15-20 minutes, so that the steel mold (3), polycrystalline diamond (12), and metal powder are sintered into one to form a polycrystalline diamond wire drawing die insert, and the metal powder will be sintered into an inclusion (111), and finally cooled to room temperature and taken out; Step S5: removing excess material on the sleeve, exposing the upper and lower ends of the polycrystalline diamond (12), performing laser hole expansion processing on the polycrystalline diamond (12), and processing the polycrystalline diamond (12) from top to bottom into an upper tapered hole (122), a micro hole (121) and a lower tapered hole (123), and finally shaping and polishing.

5. The sintering method for manufacturing a wire drawing die sleeve according to claim 4, characterized in that: The metal powders are prepared in percentage by mass as follows: 30 wt % Zn powder, 25 wt % Al powder, 5 wt % Sn powder, 2 wt % Mg powder, 20 wt % Ni powder, 10 wt % Pb powder and 8 wt % Fe powder.

6. The sintering method for manufacturing a wire drawing die sleeve according to claim 4, characterized in that: The metal powders are prepared in percentage by mass as follows: 35 wt % Zn powder, 25 wt % Al powder, 10 wt % Sn powder, 2 wt % Mg powder, 15 wt % Ni powder, 5 wt % Pb powder and 8 wt % Fe powder.

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