Extrusion die for a cored carbide rod

Abstract

The utility model provides a kind of hole hard alloy bar extrusion die, it is related to pipe processing technical field;The hole hard alloy bar extrusion die of the present application, including die assembly, core mould assembly and feed plate;Die assembly includes discharge pipe and transition pipe;Discharge pipe is internally provided with the first extrusion channel of invariable diameter;Transition pipe is internally provided with the second extrusion channel of gradually reducing diameter;The diameter of the second extrusion channel gradually reduces one end and the diameter of the first extrusion channel cooperate;Core mould assembly is arranged in the inside of die assembly;Core mould assembly includes core rod and core rod fixed part core rod fixed part one end is connected with core rod, and the other end of core rod fixed part is connected with the feed plate;Core rod extends to the inside of the first extrusion channel from the second extrusion channel.This die not only can be suitable for continuous production's hole long bar, and manufacturing cost is low;And using split design, it is convenient to disassemble replacement to adapt to different hole hard alloy bar;This die is simple, and preparation precision is high.

Description

Technical Field

[0001] This application relates to the field of pipe processing technology, and in particular to a perforated cemented carbide bar extrusion die. Background Technology

[0002] The conventional method for preparing perforated cemented carbide rods is to press the required alloy powder into a rod blank, sinter it, and then drill holes using mechanical or laser techniques. This method not only has limitations in drilling depth but also suffers from large errors and a tendency to produce burrs. In addition, the molds used to press perforated long rods from powder often require electrical discharge molding of the entire alloy mold, resulting in low manufacturing precision.

[0003] To address the problems encountered in the preparation of perforated cemented carbide rods using the aforementioned technology, Chinese utility model patent CN206811135U discloses a combined mold for producing microporous shaped cemented carbide tubes. This mold consists of a lower end cap, a core rod, an outer sleeve, an inner sleeve, and an upper end cap. The core rod is fixed at both ends inside the lower and upper end caps, respectively. The inner sleeve fits snugly against the end faces of the lower and upper end caps and forms a mold cavity with the core rod. The outer sleeve is tightly fitted onto the outer walls of the lower and upper end caps, radially surrounding the core rod, with the inner side of the outer sleeve contacting the outer side of the inner sleeve. This combined structure enables the production of microporous shaped tubes. However, this technology features a closed internal cavity and is suitable for wet-bag cold isostatic pressing, but not for the continuous production of long perforated rods. Utility Model Content

[0004] Therefore, it is necessary to provide a perforated cemented carbide rod extrusion die to address the above-mentioned technical problems. This die is not only suitable for continuous production of perforated long rods, but also easy to disassemble and replace to adapt to different perforated cemented carbide rods, and has high manufacturing precision.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution;

[0006] A perforated cemented carbide bar extrusion die includes a die assembly, a core die assembly, and a feed plate for providing alloy raw materials;

[0007] The die assembly includes a discharge tube and a transition tube; the discharge tube has a first extrusion channel with a constant diameter inside; the transition tube has a second extrusion channel with a gradually decreasing diameter inside; the end of the second extrusion channel with a gradually decreasing diameter matches the diameter of the first extrusion channel.

[0008] The core mold assembly is disposed inside the die assembly; the core mold assembly includes a core rod and a core rod fixing part, one end of the core rod fixing part is connected to the core rod, and the other end of the core rod fixing part is connected to the feed plate; the core rod extends from the second extrusion channel to the interior of the first extrusion channel.

[0009] Furthermore, the discharge pipe is fitted with a fixed sleeve, the inside of which mates with the outer wall of the discharge pipe; the bottom of the fixed sleeve is provided with a sleeve groove, and the sleeve groove is matched with a protruding limiting part at the bottom of the discharge pipe that mates with the sleeve groove; the fixed sleeve is connected to the transition pipe.

[0010] Furthermore, the fixing sleeve is provided with a through first fixing hole; the transition tube is provided with a second fixing hole at a corresponding position, the first fixing hole and the second fixing hole are provided with threads, and the fixing sleeve and the transition tube are fixedly connected by screws.

[0011] Furthermore, the first fixing holes are arranged in a rectangular pattern around the discharge pipe, and there are four of the first fixing holes.

[0012] Furthermore, a fixing groove is provided at the bottom of the transition tube near the second extrusion channel, which cooperates with the outer wall of the feed plate, and the diameter of the fixing groove is larger than the diameter of the second extrusion channel.

[0013] Furthermore, the bottom of the transition tube is provided with a limiting protrusion for limiting the relative position of the transition tube and the feed plate during feeding.

[0014] Furthermore, a sealing ring is provided at the bottom of the discharge pipe where it contacts the transition pipe.

[0015] Furthermore, the diameter of the second extrusion channel has a transition channel that matches the diameter of the first extrusion channel.

[0016] Furthermore, a fixing block is provided in the middle of the feed plate, and a third fixing hole is provided on the fixing block. A connecting part is provided at the end of the core rod fixing part away from the core rod, and the connecting part is detachably and fixedly connected to the third fixing hole.

[0017] Furthermore, the feeding plate is provided with a feeding port and a guide plate. One end of the guide plate is connected to the fixed block, and the other end of the guide plate is connected to the periphery of the feeding plate. The axial section angle θ of the guide plate is 15~45°.

[0018] This utility model has the following technical effects:

[0019] (1) This mold is not only applicable to continuous production of perforated long bars, but also easy to disassemble and replace to adapt to different perforated cemented carbide bars, and has a wide range of applications.

[0020] (2) This mold adopts a split design, which makes the manufacturing process simpler and the assembly and disassembly more convenient; and the alloy is in the first forming position, which strengthens the mold life and reduces the mold manufacturing cost.

[0021] (3) This mold can perform discharge molding on the discharge tube, which shortens the effective discharge length and improves the preparation accuracy. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the perforated cemented carbide bar extrusion die of this utility model.

[0023] Figure 2 This is an exploded view of the perforated cemented carbide bar extrusion die of this utility model.

[0024] Figure 3 This is an axial sectional view of the perforated cemented carbide bar extrusion die of this utility model.

[0025] Figure 4 This is a cross-sectional view of the die assembly in the perforated cemented carbide bar extrusion die of this utility model.

[0026] Figure 5 This is a schematic diagram of the core die assembly of the perforated cemented carbide bar extrusion die of this utility model.

[0027] Figure 6 This is a cross-sectional view of the feed plate of the perforated cemented carbide bar extrusion die of this utility model along the BB and CC directions.

[0028] Figure 7 This invention relates to an alloy rod prepared using a perforated cemented carbide rod extrusion die.

[0029] The meanings of the labels in the image are as follows:

[0030] Die assembly 100; discharge pipe 110; first extrusion channel 111; protrusion limiting part 112; sealing ring 113; transition pipe 120; second extrusion channel 121; second fixing hole 122; fixing groove 123; limiting protrusion 124; transition channel 125; core die assembly 200; core rod 210; core rod fixing part 220; connecting part 230; feed plate 300; fixing block 310; third fixing hole 311; feed inlet 320; guide plate 330; fixing sleeve 400; sleeve groove 410; first fixing hole 420; alloy rod 500; alloy rod thread 510; alloy rod inner hole 520. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0032] Combination Figure 1-2This embodiment provides a perforated cemented carbide bar extrusion die, including a die assembly 100, a core die assembly 200, and a feed plate 300 for providing alloy raw materials;

[0033] The die assembly 100 includes a discharge pipe 110 and a transition pipe 120; the discharge pipe 110 has a first extrusion channel 111 with a constant diameter inside; the transition pipe 120 has a second extrusion channel 121 with a gradually decreasing diameter inside; the end of the second extrusion channel 121 with a gradually decreasing diameter matches the diameter of the first extrusion channel 111.

[0034] The core mold assembly 200 is disposed inside the die assembly 100; the core mold assembly 200 includes a core rod 210 and a core rod fixing part 220, one end of the core rod fixing part 220 is connected to the core rod 210, and the other end of the core rod fixing part 220 is connected to the feed plate 300; the core rod 210 extends from the second extrusion channel 121 to the interior of the first extrusion channel 111.

[0035] Combined with appendix Figure 3 and Figure 4 As an optional solution, the bottom of the transition tube 120 near the second extrusion channel 121 is provided with a fixing groove 123 that cooperates with the outer wall of the feed plate 300. The diameter of the fixing groove 123 is larger than the diameter of the second extrusion channel 121.

[0036] As an optional solution, the bottom of the transition tube 120 is provided with a limiting protrusion 124 for limiting the relative position of the transition tube 120 and the feed plate 300 during feeding.

[0037] As an optional solution, a sealing ring 113 is provided at the contact point between the bottom of the discharge pipe 110 and the transition pipe 120. During the extrusion process of the alloy bar 500, it is driven by high pressure, and the sealing ring 113 can effectively seal the gap and ensure no air leakage.

[0038] To increase the connection stability between the discharge pipe 110 and the transition pipe 120, combined with the attached... Figure 1-2 As an optional solution, the discharge pipe 110 is fitted with a fixing sleeve 400, the inside of which fits with the outer wall of the discharge pipe 110; the bottom of the fixing sleeve 400 is provided with a sleeve groove 410, and the sleeve groove 410 and the bottom of the discharge pipe 110 are provided with a protruding limiting part 112 that fits with the sleeve groove 410. The protruding limiting part 112 can increase the stability of the fixing sleeve 400 and the discharge pipe 110; the fixing sleeve 400 is connected to the transition pipe 120.

[0039] As an optional solution, the fixing sleeve 400 is provided with a through first fixing hole 420; the transition tube 120 is provided with a corresponding second fixing hole 122. The first fixing hole 420 and the second fixing hole 122 are provided with threads, and the fixing sleeve 400 and the transition tube 120 are fixedly connected by screws.

[0040] As a further preferred option, the first fixing holes 420 are arranged in a rectangular shape around the discharge pipe 110, and there are 4 first fixing holes 420 to improve the stability of fixing.

[0041] To increase the detachability of the feed plate 300 and the mandrel assembly 200, facilitating replacement and adaptability for the preparation of different perforated cemented carbide rods, combined with Figure 5 and Figure 6 As an optional solution, a fixing block 310 is provided in the middle of the feed plate 300, and a third fixing hole 311 is provided on the fixing block 310. A connecting part 230 is provided at the end of the core rod fixing part 220 away from the core rod 210. The connecting part 230 is detachably and fixedly connected to the third fixing hole 311.

[0042] To increase the stability of tube forming after the alloy raw material is extruded into the first extrusion channel 111, such as Figure 4 As an alternative, the diameter of the second extrusion channel 121 has a transition channel 125 that matches the diameter of the first extrusion channel 111.

[0043] To increase the fluidity of alloy raw materials during extrusion, such as Figure 6 As an optional solution, the feed plate 300 is provided with a feed port 320 and a guide plate 330. One end of the guide plate 330 is connected to the fixed block 310, and the other end of the guide plate 330 is connected to the periphery of the feed plate 300. The axial section angle θ of the guide plate 330 is 15~45°. At this angle, the resistance is small, which facilitates the flow of powder. Preferably, θ1 in the section is 15~25° and θ2 in the section is 35~45°. During the extrusion process, the material enters from the rear wide opening and exits from the forming hole. The smaller the angle, the less resistance to the material. While reducing the resistance, it is also necessary to strengthen the strength of the workpiece and ensure that the workpiece does not deform or get damaged while reducing the resistance.

[0044] As an optional solution, the materials used for each component are all existing technologies, and the materials can meet the following requirements: the fixing sleeve 400, the core mold assembly 200, and the feed plate 300 are SKD11, quenched to HRC55-60; the discharge pipe 110 is a high wear-resistant cemented carbide; the first fixing hole 420 can be an M8 internal hexagon fixing through hole.

[0045] In the specific implementation process, when using the perforated cemented carbide rod 500 extrusion die, first, the fixing sleeve 400 is fitted onto the outside of the discharge tube 110 in the die assembly 100. The sleeve groove 410 cooperates with the protruding limiting part 112 in the discharge tube 110. At this time, the transition tube 120 is placed behind the discharge tube 110. The screws are then passed sequentially through the first fixing hole 420 to the corresponding second fixing hole 122 on the transition tube 120. At this time, the fixing sleeve 400 is completely fixed to the die assembly 100. Then, the core die assembly 200 is connected to the third fixing block 310 through the connecting part 230. The fixed connection is made through the fixed hole 311, preferably with a threaded connection at the top; at this time, the feed plate 300 is embedded into the fixed groove 123, and the core rod 210 is inserted into the second extrusion channel 121 and the first extrusion channel 111 respectively; at this time, the assembly of the feed plate 300 and the core mold assembly 200 is completed; at this time, the external feeding equipment, through the limiting protrusion 124 on the clamp and the transition tube 120, then the alloy powder enters from the feed port 320 of the feed plate 300, and is extruded through the second extrusion channel 121 and the first extrusion channel 111 in sequence to form a tube that is not easily deformed. The tube is then subjected to high-temperature sintering or electro-treatment, such as Figure 7 As shown, a finished alloy rod 500 is formed; due to the extrusion pressure, an alloy rod thread 510 is formed inside the alloy rod 500, which is in sync with the thread provided on the inner wall of the first extrusion channel 111, and an alloy rod inner hole 520 is formed due to the extrusion action of the core rod 210; when it is necessary to disassemble and replace parts, stop feeding, remove the feed plate 300, and remove the screws to disassemble each part. The reassembly after replacement is the same as before.

Claims

1. A perforated cemented carbide bar extrusion die, characterized in that, It includes a die assembly (100), a core die assembly (200), and a feed plate (300) for providing alloy raw materials. The die assembly (100) includes a discharge pipe (110) and a transition pipe (120); the discharge pipe (110) has a first extrusion channel (111) with a constant diameter inside; the transition pipe (120) has a second extrusion channel (121) with a gradually decreasing diameter inside; the end of the second extrusion channel (121) with a gradually decreasing diameter matches the diameter of the first extrusion channel (111); The core mold assembly (200) is disposed inside the die assembly (100); the core mold assembly (200) includes a core rod (210) and a core rod fixing part (220), one end of the core rod fixing part (220) is connected to the core rod (210), and the other end of the core rod fixing part (220) is connected to the feed plate (300); the core rod (210) extends from the second extrusion channel (121) to the interior of the first extrusion channel (111); The discharge pipe (110) is fitted with a fixing sleeve (400), the inside of which is fitted with the outer wall of the discharge pipe (110); the bottom of the fixing sleeve (400) is provided with a sleeve groove (410), and the sleeve groove (410) is fitted with a protruding limiting part (112) at the bottom of the discharge pipe (110); the fixing sleeve (400) is connected to the transition pipe (120); The diameter of the second extrusion channel (121) has a transition channel (125) that matches the diameter of the first extrusion channel (111). The feed plate (300) is provided with a fixing block (310) in the middle, and a third fixing hole (311) is provided on the fixing block (310). The core rod fixing part (220) is provided with a connecting part (230) at one end away from the core rod (210). The connecting part (230) is detachably and fixedly connected to the third fixing hole (311). The feed plate (300) is provided with a feed inlet (320) and a guide plate (330). One end of the guide plate (330) is connected to the fixing block (310), and the other end of the guide plate (330) is connected to the periphery of the feed plate (300). The axial section angle θ of the guide plate (330) is 15~45°.

2. The perforated cemented carbide rod extrusion die according to claim 1, characterized in that, The fixed sleeve (400) is provided with a through first fixed hole (420); the transition tube (120) is provided with a corresponding second fixed hole (122). The first fixed hole (420) and the second fixed hole (122) are provided with threads. The first fixed hole (420) and the second fixed hole (122) are fixedly connected to the fixed sleeve (400) and the transition tube (120) by screws.

3. The perforated cemented carbide rod extrusion die according to claim 2, characterized in that, The first fixing holes (420) are arranged in a rectangular shape around the discharge pipe (110), and there are 4 first fixing holes (420).

4. The perforated cemented carbide rod extrusion die according to claim 1, characterized in that, The bottom of the transition tube (120) near the second extrusion channel (121) has a fixing groove (123) that cooperates with the outer wall of the feed plate (300). The diameter of the fixing groove (123) is larger than the diameter of the second extrusion channel (121).

5. The perforated cemented carbide rod extrusion die according to claim 1, characterized in that, The bottom of the transition tube (120) is provided with a limiting protrusion (124) for limiting the relative position of the transition tube (120) and the feed plate (300) during feeding.

6. The perforated cemented carbide rod extrusion die according to claim 1, characterized in that, A sealing ring (113) is provided at the bottom of the discharge pipe (110) where it contacts the transition pipe (120).

Images