One-time forming diamond die for high-temperature drawing and machining method

Abstract

The invention provides a one-time forming diamond die for high-temperature drawing and a machining method. An upper outer ring die punch is arranged on the outer wall of a main pressing die punch in a sleeving mode, a sliding annular die punch is arranged in the main pressing die punch in a sleeving mode, an outer lower die is arranged in a female die, a positioning lower die is arranged in the outer lower die in a sleeving mode, and the upper end of the positioning lower die is of a conical structure; the conical structure protrudes out of the upper surface of the outer lower die. The bottom plate and the mold core are pressed into a whole and then sintered, manufacturing of the wire drawing mold is completed, the production efficiency is effectively improved, the production cost is reduced, the matching precision is high, and the manufacturing efficiency is high.

Description

Technical Field

[0001] The invention relates to the field of wire drawing dies, and in particular to a one-time forming diamond die for high-temperature drawing and a processing method thereof. Background Art

[0002] The existing diamond wire drawing dies are made of stainless steel or brass, powder metallurgy, and the core is diamond. During the wire drawing die processing, the core needs to be placed at the center of the bottom of the inner hole of the die sleeve, and then the alloy powder is placed in the gap part of the inner hole of the die sleeve, and then the core cover is added and sintered at high temperature and high pressure. Although the core has a high thermal conductivity, the sintered body is not heat-resistant enough. During the drawing process, the sintered body is prone to cracking. At the same time, the core wears quickly and cannot maintain the overall stability of the die.

[0003] The Chinese patent "CN219683597U" provides a wire drawing die for high strength and high temperature, including a die core, a bottom plate at the bottom of the die core, the die core material is PDC polycrystalline diamond, the bottom plate material is tungsten steel; the die core is in contact with the coolant, and the bottom plate is installed on the base. The heat generated by the wire drawing and the die core can not only be transferred through the die core and the coolant, but also the heat can be transferred from the die core to the bottom plate made of tungsten steel, and then from the bottom plate to the base or the air, further accelerating the heat dissipation efficiency.

[0004] However, the connection method between the core and the base plate of the wire drawing die is welding. During long-term use, the brazing layer at the welding position is prone to fall off. The welding method is complicated to manufacture, and the welding progress is poor. The concentricity of the connection between the core and the base plate is not easy to grasp. Summary of the invention

[0005] The main purpose of the present invention is to provide a one-time forming diamond mold and processing method for high-temperature drawing, so as to solve the problem that the connection between the drawing die core and the base plate adopts welding connection. During long-term use, the brazing layer at the welding position is prone to fall off, and the welding method is complicated to manufacture and has poor welding progress.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a one-time forming diamond mold for high-temperature drawing, the upper outer ring die punch is sleeved on the outer wall of the main pressing die punch, the main pressing die punch is sleeved with a sliding ring die punch, the female mold is provided with an outer lower mold, the outer lower mold is sleeved with a positioning lower mold, the upper end of the positioning lower mold is a conical structure, and the conical structure protrudes from the upper surface of the outer lower mold.

[0007] In the preferred embodiment, a ring hole is provided inside the main pressing die, the upper end of the ring hole is connected to a plurality of sliding holes, a plurality of dividing grooves are provided at the upper end of the annular die, the dividing grooves divide a plurality of sliding strips, and the sliding strips pass through the ring hole and are slidably connected to the sliding holes; The lower end of the annular die punch protrudes from the main die punch surface and is used for punching out an annular positioning groove of the bottom plate.

[0008] In the preferred embodiment, the lower opening of the upper outer ring die punch is provided with an inner chamfer, and the inner chamfer and the outer surface of the main pressing die punch form a ring notch, and the outer wall of the upper outer ring die punch cooperates with the female die.

[0009] In the preferred embodiment, a plurality of sliding grooves are provided inside the outer lower mold, a sliding key is provided at the lower end of the positioning lower mold, and the sliding key is slidably connected to the sliding groove.

[0010] In the preferred embodiment, the lower opening of the sliding groove is connected to the flange plate, and the lower surface of the sliding key is positioned against the surface of the flange plate so that the upper end of the positioning lower mold protrudes from the outer lower mold surface, and the upper end of the positioning lower mold protrudes to form a mold sleeve outlet of the bottom plate.

[0011] In the preferred embodiment, a recessed avoidance ring is provided at the center of the lower end surface of the main die punch.

[0012] In the preferred embodiment, a loading arm is further provided, which is connected to the robot arm. The loading arm is provided with a suction trough, which fits the mold core. A suction cup is provided inside the suction trough, which sucks up the mold core and places it inside the female mold.

[0013] In the preferred embodiment, a plurality of positioning posts are provided below the loading arm, and a plurality of positioning holes cooperating with the positioning posts are provided on the upper surface of the female mold.

[0014] In the preferred solution, the bottom plate is formed by powder pressing, the bottom plate is provided with a mounting groove, and the mold core is arranged inside the mounting groove; A concave annular positioning groove is provided on the inner bottom surface of the installation groove, and a convex positioning ring is provided on the lower surface of the mold core, and the positioning ring is plugged into the installation groove; A sintering table is arranged between the bottom plate and the outer ring of the mold core.

[0015] The method includes: S1, the outer lower die and the positioning lower die fall into the inner part of the female die, the sliding key below the positioning lower die is positioned against the upper surface of the flange of the lower section of the outer lower die, and the upper part of the positioning lower die protrudes from the upper end of the outer lower die; S2, fill the inside of the female die with metal powder, keep the lower end of the upper outer ring punch flush with the lower end of the main die punch, and the annular punch protrudes from the lower surface of the main die punch, and start to preliminarily press the metal powder inside the female die, pressing the die sleeve outlet and the annular positioning groove of the punch bottom plate; S3, the outer lower die and the positioning lower die lift the initially pressed bottom plate to the upper opening of the female die, and a distance is left between the bottom plate and the upper opening of the female die; The initial punching forms an annular protrusion under the pressure of the ring gap, which is used for positioning the mold core; S4, the loading arm of the manipulator sucks up the mold core, and the positioning column and positioning hole of the loading arm position the mold core on the upper surface of the preliminary bottom plate, the positioning ring of the mold core is inserted into the annular positioning groove, and the avoidance hole on the top of the mold core is matched with the raised position of the upper end of the positioning lower mold; The mold core is pressed by the ring notch to form a ring-shaped raised middle part; S5, the outer lower die and the positioning lower die descend synchronously, and metal powder is filled between the outer surface of the mold core and the female die for the second time; S6, the lower ends of the main pressing die punch and the annular die punch are flush, the upper outer ring die punch extends out of the lower end surfaces of the main pressing die punch and the annular die punch, the main pressing die punch and the annular die punch are pressed on the upper surface of the die core, the upper outer ring die punch presses the secondary filling of the female die, and the main pressing die punch, the annular die punch and the upper outer ring die punch perform the final pressing on the die core and the bottom plate; S7, the mold core and the bottom plate are pressed and bonded together, the lower mold is positioned upward to push the mold core and the bottom plate out of the female mold, and the mold core and the bottom plate are sintered into a whole in the sintering furnace at the same time; S8, after the core and the bottom plate are sintered, laser is used to detect the inside of the core and the bottom plate. If there are no cracks inside the core and the bottom plate, the next step of drilling is entered; S9. According to the positioning of the die sleeve outlet of the bottom plate and the outer surface of the die core, the die sleeve inlet is processed on the die core, and the die sleeve inlet and the die sleeve outlet form a drawing hole.

[0016] The present invention provides a one-time forming diamond die and processing method for high temperature drawing, firstly pressing a base plate for preliminary forming, then placing a mold core on the preliminary formed base plate, combining the mold core with the preliminary formed base plate by positioning, then performing secondary pressing on the base plate and the mold core, pressing the base plate and the mold core into one body, then sintering the base plate and the mold core, completing the manufacture of the wire drawing die, effectively improving production efficiency, reducing production costs, and having high matching accuracy and high manufacturing efficiency, being able to directly press the wire drawing die, and sintering the wire drawing die after pressing and forming, and the pressed and formed die can be fully combined with the coolant. The conduction area is increased to accelerate the conduction heat dissipation efficiency, greatly improving the heat dissipation performance of polycrystalline diamond. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 This is the overall pressing structure diagram of the manufacturing mold of the present invention; Figure 2 This is a structural diagram of the main pressing die and the annular die of the present invention; Figure 3 This is a cross-sectional structural diagram of the installation of the main pressing die punch and the annular die punch of the present invention; Figure 4 This is a disassembled structural diagram of the main pressing die punch and the annular die punch of the present invention; Figure 5 It is a cross-sectional structural diagram of the wire drawing die of the present invention; Figure 6 This is the appearance structure diagram of the wire drawing die of the present invention; Figure 7 This is a cross-sectional structural diagram of the wire drawing die of the present invention after the drilling process is completed; Figure 8 This is a structural diagram of the base plate of the present invention after preliminary sintering; Fig. 9 This is a structural diagram of the feeding mold core of the feeding arm of the present invention; Fig.10 This is a structural diagram of the secondary filling metal powder of the present invention; Fig.11 This is a structural diagram of the upper outer ring of the present invention after being punched and protruded; Fig.12 This is a structural diagram of the mold core position after secondary filling of the present invention; Fig.13 This is a diagram of the secondary filling, pressing and bonding structure of the present invention; Fig.14 This is a structural diagram of the positioning lower die lifting and discharging of the present invention; In the figure: upper outer ring punch 1; ring notch 101; main pressure punch 2; sliding hole 201; avoidance ring opening 201; annular punch 3; dividing groove 301; mold core 4; positioning ring 401; mold sleeve inlet 402; bottom plate 5; mounting groove 501; mold sleeve outlet 502; sintering table 503; female mold 6; positioning hole 601; outer lower mold 7; sliding groove 701; positioning lower mold 8; sliding key 801; loading arm 9; suction cup 10; positioning column 11; secondary filling 12. DETAILED DESCRIPTION

[0018] Example 1 like Figures 1 to 14 As shown, a one-time forming diamond die for high temperature drawing, the upper outer ring die punch 1 is sleeved on the outer wall of the main die punch 2, the main die punch 2 is sleeved with a sliding ring die punch 3, the inner part of the female die 6 is provided with an outer lower die 7, the inner part of the outer lower die 7 is sleeved with a positioning lower die 8, the upper end of the positioning lower die 8 is a conical structure, and the conical structure protrudes from the upper surface of the outer lower die 7. The bottom plate 5 and the core 4 are pressed and formed, the bottom plate 5 is pressed and formed initially, and then the core 4 is placed on the initially formed bottom plate 5, and the core 4 is combined with the initially formed bottom plate 5 by positioning, and then the bottom plate 5 and the core 4 are pressed for a second time, and the bottom plate 5 and the core 4 are pressed into one body, and then the bottom plate 5 and the core 4 are sintered to complete the manufacture of the wire drawing die.

[0019] In the preferred embodiment, a ring hole is provided inside the main pressing die 2, and the upper end of the ring hole is connected to multiple sliding holes 201. A plurality of dividing grooves 301 are provided on the upper end of the ring die 3. The dividing grooves 301 divide multiple sliding strips, and the sliding strips pass through the ring hole and are slidably connected to the sliding holes 201; the main pressing die 2 can be raised and lowered inside and outside, and the ring die 3 and the main pressing die 2 can be raised and lowered separately.

[0020] The lower end of the annular die punch 3 protrudes from the surface of the main die punch 2, and is used to punch out an annular positioning groove of the bottom plate 5. The annular positioning groove is butted with the positioning ring 401 below the mold core 4 to complete the positioning of the mold core 4.

[0021] In the preferred embodiment, the lower opening of the upper outer ring die punch 1 is provided with an inner chamfer, and the inner chamfer and the outer surface of the main pressing die punch 2 form a ring notch 101, and the outer wall of the upper outer ring die punch 1 cooperates with the female die 6. The ring notch 101 can press out a raised chamfer structure, and during the initial molding, a positioning raised line of the annular structure can be formed on the bottom plate 5.

[0022] In the preferred embodiment, a plurality of sliding grooves 701 are provided inside the outer lower mold 7, and a sliding key 801 is provided at the lower end of the positioning lower mold 8, and the sliding key 801 is slidably connected with the sliding groove 701. The sliding key 801 is a spline, which is convenient for positioning and sliding.

[0023] In the preferred embodiment, the lower opening of the sliding groove 701 is connected to the flange plate, and the lower surface of the sliding key 801 is positioned against the surface of the flange plate, so that the upper end of the positioning lower mold 8 protrudes from the surface of the outer lower mold 7, and the upper end of the positioning lower mold 8 protrudes to form the mold sleeve outlet 502 of the bottom plate 5. The raised position of the upper end of the positioning lower mold 8 is positioned.

[0024] In the preferred embodiment, a recessed avoidance ring 201 is provided at the center of the lower end surface of the main pressing die 2 to cooperate with the upper end of the positioning lower die 8 to press the die sleeve outlet 502 on the bottom plate 5 .

[0025] In the preferred embodiment, a loading arm 9 is further provided, which is connected to the manipulator, and is provided with a suction trough, which fits the mold core 4, and a suction cup 10 is provided inside the suction trough, which sucks up the mold core 4 and places it inside the female mold 6. The loading arm 9 is used to load the mold core 4, and the mold core 4 is placed on the preliminarily formed bottom plate 5.

[0026] In the preferred embodiment, a plurality of positioning posts 11 are further provided below the loading arm 9, and a plurality of positioning holes 601 are provided on the upper surface of the female mold 6 to match the positioning posts 11. The positioning posts 11 match the positioning holes 601 to facilitate accurate placement of the mold core 4 and the bottom plate 5.

[0027] Example 2 Further illustrate with reference to Example 1, Figure 1-14The structure shown includes a base plate 5, which is formed by powder pressing. A mounting groove 501 is provided on the base plate 5, and the mold core 4 is arranged inside the mounting groove 501; a recessed annular positioning groove is provided on the bottom surface of the mounting groove 501, and a raised positioning ring 401 is provided on the lower surface of the mold core 4, and the positioning ring 401 is plugged in and matched with the mounting groove 501; a sintering table 503 is provided between the base plate 5 and the outer ring of the mold core 4.

[0028] Avoid the existing technology that only contacts the coolant through the mold sleeve inlet, increase the conduction area, speed up the conduction heat dissipation efficiency, and greatly improve the heat dissipation performance of polycrystalline diamond. A bottom plate is provided at the bottom of the mold core. The heat generated by wire drawing and the mold core can not only be transferred through the mold core and the coolant, but also from the mold core to the bottom plate, and then from the bottom plate to the base or the air, further accelerating the heat dissipation efficiency.

[0029] The mold core is connected to the bottom plate. During the wire drawing process, the bottom plate plays a supporting role at the bottom of the mold core. Under the wire drawing pressure, it increases the base strength, maintains the stability of the overall structure, avoids the mold from getting stuck and unable to be removed, and extends the service life.

[0030] The bottom plate 5 is made of a mixture of iron powder, nickel powder, aluminum powder, zinc powder, tungsten carbide powder, copper powder, and cobalt powder, wherein tungsten carbide powder accounts for 80-90%.

[0031] The base plate 5 is initially pressed at a pressure of 20-30 MPa for 3-5 minutes to obtain a preliminary pressed green body; The secondary filling 13 is pressed at a pressure of 30-50 MPa for 6-7 minutes to obtain the integral structure of the mold core 4 and the bottom plate 5; The mold core 4 and the bottom plate 5 are placed in a vacuum for sintering at a temperature of 500 to 600° C. for 6 to 8 hours.

[0032] Then, an inert gas is introduced to increase the pressure to 1000-1200 MPa, and heat treatment is performed at 1300-1400°C for 2-4 hours; After the high temperature treatment is completed, the pressure is reduced and annealing treatment is performed at 300-400° C. for 30-40 minutes to obtain a sintered part between the mold core 4 and the bottom plate 5.

[0033] The sintered part between the mold core 4 and the bottom plate 5 is polished and drilled to complete the production.

[0034] Example 3 Further illustrate with reference to Examples 1-2, Figure 1-14 In the structure shown, S1, the outer lower mold 7 and the positioning lower mold 8 fall into the inner part of the female mold 6, the sliding key 801 below the positioning lower mold 8 is positioned against the upper surface of the flange of the lower section of the outer lower mold 7, and the upper part of the positioning lower mold 8 protrudes from the upper end of the outer lower mold 7; S2, fill the metal powder into the female die 6, keep the lower end of the upper outer ring die punch 1 flush with the lower end of the main die punch 2, and the annular die punch 3 protrudes from the lower surface of the main die punch 2, and start to preliminarily press the metal powder inside the female die 6, pressing the die sleeve outlet 502 and the annular positioning groove of the punch bottom plate 5; S3, the outer lower die 7 and the positioning lower die 8 lift the initially pressed bottom plate 5 to the upper opening position of the female die 6, and a distance is left between the bottom plate 5 and the upper opening of the female die 6; The initial punching forms an annular protrusion under the pressure of the annular notch 101, which is used for positioning the mold core 4; S4, the loading arm 9 of the manipulator sucks up the mold core 4, and the positioning column 11 and the positioning hole 601 of the loading arm 9 position the mold core 4 on the upper surface of the preliminary bottom plate 5, and the positioning ring 401 of the mold core 4 is inserted into the annular positioning groove, and the avoidance hole on the top of the mold core 4 is matched with the raised position of the upper end of the positioning lower mold 8; The mold core 4 is pressed by the ring notch 101 to form a ring-shaped raised middle portion; S5, the outer lower mold 7 and the positioning lower mold 8 are synchronously lowered to fill 13 metal powder between the outer surface of the mold core 4 and the female mold 6 for the second time; S6, the lower ends of the main pressing die punch 2 and the annular die punch 3 are flush, the upper outer ring die punch 1 extends out of the lower end surfaces of the main pressing die punch 2 and the annular die punch 3, the main pressing die punch 2 and the annular die punch 3 are pressed on the upper surface of the mold core 4, the upper outer ring die punch 1 presses the secondary filling 13 of the female mold 6, and the main pressing die punch 2, the annular die punch 3 and the upper outer ring die punch 1 perform the final pressing on the mold core 4 and the bottom plate 5; S7, the mold core 4 and the bottom plate 5 are pressed and bonded together, the lower mold 8 is positioned to push the mold core 4 and the bottom plate 5 upward out of the female mold 6, and the mold core 4 and the bottom plate 5 are sintered into a whole in the sintering furnace at the same time; S8, after the core 4 and the bottom plate 5 are sintered, laser is used to detect the inside of the core 4 and the bottom plate 5. If there are no cracks inside the core 4 and the bottom plate 5, the next step of drilling is entered; S9. According to the positioning of the die sleeve outlet 502 of the bottom plate 5 and the outer surface of the die core 4, the die sleeve inlet 402 is processed on the die core 4, and the die sleeve inlet 402 and the die sleeve outlet 502 form a drawing hole.

[0035] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A one-time forming diamond die for high temperature drawing, characterized by: The upper outer ring die punch (1) is sleeved on the outer wall of the main pressing die punch (2), a sliding ring die punch (3) is sleeved inside the main pressing die punch (2), an outer lower die (7) is arranged inside the female die (6), a positioning lower die (8) is sleeved inside the outer lower die (7), and the upper end of the positioning lower die (8) is in a conical structure, and the conical structure protrudes from the upper surface of the outer lower die (7).

2. According to claim 1, a one-time forming diamond mold for high temperature drawing, characterized in that: The die punch (2) is provided with an annular hole inside, the upper end of the annular hole is connected to a plurality of sliding holes (201), the upper end of the annular die punch (3) is provided with a plurality of dividing grooves (301), the dividing grooves (301) divide a plurality of sliding strips, and the sliding strips pass through the annular hole and are slidably connected to the sliding holes (201); The lower end of the annular die punch (3) protrudes from the surface of the main die punch (2) and is used to punch out an annular positioning groove of the bottom plate (5).

3. A one-time forming diamond mold for high temperature drawing according to claim 1, characterized in that: The lower opening of the upper outer ring die punch (1) is provided with an inner chamfer, and the inner chamfer and the outer surface of the main pressing die punch (2) form a ring notch (101), and the outer wall of the upper outer ring die punch (1) cooperates with the female die (6).

4. The one-time forming diamond mold for high temperature drawing according to claim 1, characterized in that: A plurality of sliding grooves (701) are provided inside the outer lower mold (7), and a sliding key (801) is provided at the lower end of the positioning lower mold (8), and the sliding key (801) is slidably connected to the sliding groove (701).

5. A one-time forming diamond mold for high temperature drawing according to claim 4, characterized in that: The lower opening of the sliding groove (701) is connected to the flange plate, and the lower surface of the sliding key (801) is positioned against the surface of the flange plate so that the upper end of the positioning lower mold (8) protrudes from the surface of the outer lower mold (7), and the upper end of the positioning lower mold (8) protrudes to form a mold sleeve outlet (502) of the bottom plate (5).

6. The one-time forming diamond mold for high temperature drawing according to claim 1, characterized in that: A concave avoidance ring opening (201) is provided at the center of the lower end surface of the main pressing die (2).

7. The one-time forming diamond mold for high temperature drawing according to claim 1, characterized in that: A loading arm (9) is also provided, the loading arm (9) is connected to the manipulator, the loading arm (9) is provided with a suction groove, the suction groove is fitted with the mold core (4), a suction cup (10) is provided inside the suction groove, and the suction cup (10) sucks up the mold core (4) and places it inside the female mold (6).

8. A one-time forming diamond mold for high temperature drawing according to claim 7, characterized in that: A plurality of positioning columns (11) are further provided below the loading arm (9), and a plurality of positioning holes (601) cooperating with the positioning columns (11) are provided on the upper surface of the female mold (6).

9. The wire drawing die made of a one-time formed diamond die for high temperature drawing according to claim 1, characterized in that: The bottom plate (5) comprises a bottom plate (5), the bottom plate (5) is formed by powder pressing, a mounting groove (501) is provided on the bottom plate (5), and the mold core (4) is arranged inside the mounting groove (501); The inner bottom surface of the installation groove (501) is provided with a concave annular positioning groove, and the lower surface of the mold core (4) is provided with a raised positioning ring (401), and the positioning ring (401) is plugged into the installation groove (501); A sintering table (503) is provided between the bottom plate (5) and the outer ring of the mold core (4).

10. A method for processing a one-shot diamond mold for high temperature drawing according to any one of claims 1 to 9, characterized in that: The method includes: S1, the outer lower mold (7) and the positioning lower mold (8) fall into the interior of the female mold (6), the sliding key (801) below the positioning lower mold (8) is positioned against the upper surface of the flange of the lower section of the outer lower mold (7), and the upper part of the positioning lower mold (8) protrudes from the upper end of the outer lower mold (7); S2, filling the inside of the female die (6) with metal powder, keeping the lower end of the upper outer ring die punch (1) flush with the lower end of the main die punch (2), and the annular die punch (3) protruding from the lower surface of the main die punch (2), starting to preliminarily press the metal powder inside the female die (6), and pressing the die sleeve outlet (502) and the annular positioning groove of the punch bottom plate (5); S3, the outer lower mold (7) and the positioning lower mold (8) lift the initially pressed bottom plate (5) to the upper opening position of the female mold (6), and a distance is left between the bottom plate (5) and the upper opening of the female mold (6); The initial punching forms an annular protrusion under the pressure of the annular notch (101) for positioning the mold core (4); S4, the loading arm (9) of the manipulator sucks up the mold core (4), and the positioning column (11) and the positioning hole (601) of the loading arm (9) position the mold core (4) on the upper surface of the preliminary bottom plate (5), and the positioning ring (401) of the mold core (4) is inserted into the annular positioning groove, and the avoidance hole on the top of the mold core (4) is matched with the upper protrusion of the positioning lower mold (8); The mold core (4) is pressed by the annular notch (101) to form an annular raised middle portion; S5, the outer lower mold (7) and the positioning lower mold (8) are synchronously lowered to fill (13) metal powder between the outer surface of the mold core (4) and the female mold (6); S6, the lower ends of the main pressing die (2) and the annular die (3) are flush, the upper outer ring die (1) extends out of the lower end surfaces of the main pressing die (2) and the annular die (3), the main pressing die (2) and the annular die (3) are pressed on the upper surface of the die core (4), the upper outer ring die (1) presses the secondary filling (13) of the female die (6), and the main pressing die (2), the annular die (3) and the upper outer ring die (1) perform the final pressing on the die core (4) and the bottom plate (5); S7, the mold core (4) and the bottom plate (5) are pressed and bonded together, the lower mold (8) is positioned to push the mold core (4) and the bottom plate (5) upward out of the female mold (6), and the mold core (4) and the bottom plate (5) are sintered into a whole in a sintering furnace at the same time; S8, after the core mold (4) and the bottom plate (5) are sintered, laser is used to detect the inside of the core mold (4) and the bottom plate (5). If there are no cracks inside the core mold (4) and the bottom plate (5), the next step of drilling is performed; S9. According to the positioning of the die sleeve outlet (502) of the bottom plate (5) and the outer surface of the die core (4), the die sleeve inlet (402) is processed on the die core (4), and a wire drawing hole is formed between the die sleeve inlet (402) and the die sleeve outlet (502).

Images