Powder metallurgy press with pre-pressing and venting mechanism

Abstract

The utility model provides a kind of powder metallurgy mould with pre-press exhaust mechanism, it is related to powder metallurgy technical field, including lower die holder;The upper and lower ends of lower die holder are fixedly connected with mould closing cylinder, the bottom upside of lower die holder is slidably connected with lower die core, the bottom end surface of lower die core is slidably connected with exhaust seat, the top downside of lower die holder is slidably connected with upper die core, the top end surface of upper die core is slidably connected with exhaust seat;The powder metallurgy mould with pre-press exhaust mechanism around cone exhaust hole increases exhaust area, in combination with the guiding structure of guide cylinder, inner guide groove and outer sliding groove, ensure that the movement trajectory of exhaust seat is accurate, both realize quick exhaust, and can prevent powder from blocking exhaust hole, reset tension spring makes exhaust seat automatic reset, guarantee the consistency of pressing process, pre-press cylinder pushes exhaust seat pre-press exhaust, can discharge most air, reduce product internal blowhole, loose and other defects, to solve the problem that mould opening and closing is unstable, exhaust is not good.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy technology, and in particular to a powder metallurgy die with a pre-pressure venting mechanism. Background Technology

[0002] Powder metallurgy is a process technology that produces metal powders or uses metal powders as raw materials, and manufactures metal materials, composite materials and various types of products through forming and sintering. In the production process of powder metallurgy products, the die is a key forming equipment. The venting design of existing powder metallurgy dies has obvious deficiencies, with small venting area and unreasonable venting path, which makes it difficult for air to be quickly discharged during the pressing process of powder raw materials. This can easily lead to powder clogging of venting holes and affect venting efficiency. At the same time, existing dies lack an effective pre-pressing venting mechanism, which cannot discharge most of the air before formal pressing. This makes it easy for defects such as porosity and looseness to be generated inside the product, and it is also difficult for the powder raw materials to be initially compacted. Utility Model Content

[0003] This utility model relates to a powder metallurgy mold with a pre-pressure venting mechanism, in order to solve the problems mentioned in the background art, such as the significant defects in the venting design of existing powder metallurgy molds, including small venting area and unreasonable venting path, which make it difficult for air to be discharged during pressing, easily causing powder blockage and seriously affecting venting efficiency, and the lack of an effective pre-pressure venting mechanism, which makes it impossible to discharge a large amount of air before formal pressing, resulting in defects such as pores and looseness inside the product.

[0004] This utility model provides a powder metallurgy die with a pre-pressure venting mechanism, specifically including: a lower die base; a die-closing cylinder is fixedly connected to the middle of both the upper and lower ends of the lower die base; a lower die core is slidably connected to the upper bottom of the lower die base; a venting seat is slidably connected to the bottom end face of the lower die core; an upper die core is slidably connected to the lower top of the lower die base; a venting seat is slidably connected to the top end face of the upper die core.

[0005] Furthermore, a concave bottom fixing bracket is fixedly connected to the bottom of the lower mold base, and an L-shaped top fixing bracket is fixedly installed on the top of the rear side wall of the lower mold base.

[0006] Furthermore, the top telescopic end of the mold-closing cylinder, which is fixedly installed at the middle of the bottom end face of the bottom fixing frame, is connected to the middle of the bottom end face of the lower mold core, and the bottom telescopic end of the mold-closing cylinder, which is fixedly installed at the middle of the top end face of the bottom fixing frame, is connected to the middle of the top end face of the upper mold core.

[0007] Furthermore, the bottom of the left and right sidewalls of the lower mold core are provided with external sliding grooves, and the bottom end face of the mold cavity of the lower mold core is provided with vent holes in a circumferential shape. The vent holes are truncated cone-shaped. Reset springs are symmetrically installed on the left and right sides of the bottom end face of the lower mold core. The other end of the reset springs is connected to the vent seat. The bottom end face of the lower mold core is provided with an annular inner guide groove.

[0008] Furthermore, the upper mold core is a symmetrical structure above the lower mold core and has the same structure. A sliding guide groove is provided in the middle of the rear side wall of the upper mold core, and the sliding guide groove is slidably connected to the top fixing frame at the top of the rear side wall of the lower mold base.

[0009] Furthermore, the exhaust seats are symmetrically provided with two slidably connected to the lower mold core and the upper mold core respectively. A guide cylinder is fixedly installed in the middle of the opposite sidewalls of the two exhaust seats. The guide cylinder is slidably connected in the inner guide groove of the lower mold core. A connecting rod is provided in a circumferential shape in the exhaust seat outside the guide cylinder. The top of the connecting rod is truncated cone-shaped. Two "Y"-shaped exhaust pipes are symmetrically connected to the opposite sidewalls of the two exhaust seats. Two pre-pressure cylinders are symmetrically connected to the opposite sidewalls of the two exhaust seats. The telescopic ends of the pre-pressure cylinders are connected to the opposite sidewalls of the lower mold core and the upper mold core.

[0010] This utility model provides a powder metallurgy die with a pre-pressure venting mechanism, which has the following beneficial effects:

[0011] 1. The surrounding frustoconical vent increases the venting area. Combined with the guiding structure of the guide cylinder, inner guide groove, and outer slide groove, it ensures the accurate movement trajectory of the vent seat, achieving rapid venting while preventing powder from clogging the vent. The reset spring automatically resets the vent seat, ensuring the consistency of the pressing process. The pre-pressurization cylinder pushes the vent seat to pre-press and vent, which can expel most of the air, reducing defects such as porosity and looseness inside the product. At the same time, by initially compacting the powder raw material, it improves the molding effect of subsequent formal pressing. The "Y"-shaped vent pipe and the frustoconical connecting rod further optimize the venting path and pre-pressurization pressure distribution, ensuring the stability and consistency of product quality.

[0012] 2. This utility model achieves precise control and stable operation of the molding process through the design of the mold-closing cylinder, the sliding connection structure of the mold core, and the fixing frame. The mold-closing cylinder can accurately control the mold-closing and mold-opening actions of the upper and lower mold cores. Combined with the sliding connection between the mold core and the lower mold base, it reduces friction loss during the mold-opening and closing process, ensuring the smoothness and repeatability of the molding action. The bottom fixing frame and the top fixing frame provide a stable installation foundation for the mold-closing cylinder and the mold core, enhance the overall structural rigidity, and effectively prevent mold deformation caused by uneven force during pressing, thereby improving the service life of the mold and the molding accuracy of the product. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.

[0014] The accompanying drawings described below are only related to some embodiments of the present invention and are not intended to limit the scope of the present invention.

[0015] In the attached diagram:

[0016] Figure 1 This is a schematic diagram of the right front side axial view structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the overall disassembled structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the disassembled, bottom-view structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0020] Figure 5 This is a cross-sectional view of the lower mold core and vent seat of this utility model.

[0021] Figure 6 This is a cross-sectional view of the upper mold core and the exhaust seat of this utility model.

[0022] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0023] 1. Lower mold base; 101. Bottom fixing frame; 102. Top fixing frame; 2. Mold closing cylinder; 3. Lower mold core; 301. Outer sliding groove; 302. Vent hole; 303. Reset tension spring; 304. Inner guide groove; 4. Upper mold core; 401. Sliding guide groove; 5. Vent seat; 501. Guide cylinder; 502. Connecting rod; 503. Vent pipe; 6. Pre-compression cylinder. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] Example 1: As shown in the attached document Figure 1 To be continued Figure 6 As shown:

[0026] This utility model provides a powder metallurgy die with a pre-pressure venting mechanism, comprising: a lower die base 1, with a die-closing cylinder 2 fixedly connected to the middle of both the upper and lower ends of the lower die base 1; a lower die core 3 slidably connected to the upper bottom of the lower die base 1; a venting seat 5 slidably connected to the bottom end face of the lower die core 3; an upper die core 4 slidably connected to the lower top of the lower die base 1; a venting seat 5 slidably connected to the top end face of the upper die core 4; a concave bottom fixing frame 101 fixedly connected to the bottom of the lower die base 1; an L-shaped top fixing frame 102 fixedly installed on the top of the rear side wall of the lower die base 1; and the top telescopic end of the die-closing cylinder 2 fixedly installed at the middle of the bottom end face of the bottom fixing frame 101 connected to the middle of the bottom end face of the lower die core 3. The bottom telescopic end of the mold-closing cylinder 2, which is fixedly installed at the middle of the top end face of the bottom fixing frame 101, is connected to the middle of the top end face of the upper mold core 4. Specifically, the mold-closing cylinder 2 can precisely control the mold-closing and mold-opening actions of the lower mold core 3 and the upper mold core 4, ensuring the stability and repeatability of the molding process. The sliding connection between the lower mold core 3, the upper mold core 4 and the lower mold base 1 makes the mold opening and closing process smoother and reduces friction loss. The bottom fixing frame 101 and the top fixing frame 102 provide a stable installation base for the mold-closing cylinder 2 and the mold core, enhance the rigidity and reliability of the entire molding structure, effectively prevent mold deformation caused by uneven force during the pressing process, and improve the service life of the mold and the molding accuracy of the product.

[0027] The lower mold core 3 has external sliding grooves 301 on the bottom of its left and right side walls. A venting hole 302, shaped like a frustum, is formed around the bottom end face of the mold cavity of the lower mold core 3. Reset springs 303 are symmetrically installed on the left and right sides of the bottom end face of the lower mold core 3, with the other end of each spring connected to the venting seat 5. An annular inner guide groove 304 is formed in the bottom end face of the lower mold core 3. The upper mold core 4 is the upper symmetrical structure of the lower mold core 3 and has the same structure. A sliding guide groove 401 is formed in the middle of the rear side wall of the upper mold core 4. The sliding guide groove 401 is slidably connected to the top fixing bracket 102 at the top of the rear side wall of the lower mold base 1. Specifically, the external sliding groove 301 facilitates the guidance of the lower mold core 3 during sliding, ensuring the movement trajectory of the venting seat 5. Accuracy is ensured by the surrounding vent 302 with a frustoconical design, which increases the venting area and facilitates the rapid expulsion of air from the powder raw material during the pressing process. The frustoconical structure also helps to prevent powder from clogging the vent 302. The reset spring 303 allows the vent seat 5 to automatically reset after completing the venting action, ensuring consistency in each pressing process. The inner guide groove 304 provides guidance for the sliding of the vent seat 5, ensuring the accurate relative position between the vent seat 5 and the lower mold core 3, thereby ensuring the venting effect. The cooperation between the sliding guide groove 401 and the top fixing frame 102 further enhances the stability of the upper mold core 4 during the sliding process, preventing it from shifting in the horizontal direction, ensuring the accuracy of the lower mold core 3 and the upper mold core 4 when they are closed, and improving the molding quality of the product.

[0028] The venting seats 5 are symmetrically arranged in two sections, slidably connected to the lower mold core 3 and the upper mold core 4 respectively. A guide cylinder 501 is fixedly installed at the midpoint of the opposite sidewalls of the two venting seats 5. The guide cylinder 501 is slidably connected to the inner guide groove 304 of the lower mold core 3. A connecting rod 502 is arranged in a circumferential shape in the venting seat 5 outside the guide cylinder 501. The top of the connecting rod 502 is frustoconical. Two Y-shaped venting pipes 503 are symmetrically connected to the opposite sidewalls of the two venting seats 5. Two pre-compression cylinders 6 are symmetrically connected to the opposite sidewalls of the two venting seats 5. The telescopic ends of the pre-compression cylinders 6 are connected to the opposite sidewalls of the lower mold core 3 and the upper mold core 4. Specifically, the symmetrically arranged venting seats 5 enable simultaneous venting from the lower mold core 3 and the upper mold core 4, improving venting efficiency. The cooperation between the guide cylinder 501 and the inner guide groove 304 further refines the sliding trajectory of the venting seats 5, ensuring efficient venting. The seat 5 will not shake during movement, ensuring the stability of the exhaust. The ring-shaped connecting rod 502 with a frustoconical top can better apply pressure to the powder material during the pre-pressing process, while also helping air to be discharged through the exhaust hole 302. The "Y"-shaped exhaust pipe 503 increases the exhaust path, which can quickly and effectively discharge air out of the mold and improve the exhaust effect. The pre-pressing cylinder 6 can push the exhaust seat 5 away from the lower mold core 3 or the upper mold core 4 during the pre-pressing process, thereby expelling most of the air and reducing defects such as air holes and looseness inside the product. At the same time, the pre-pressing process can also initially compact the powder material, improve the molding effect and product quality of the subsequent formal pressing. Furthermore, the connection method between the pre-pressing cylinder 6 and the lower mold core 3 and the upper mold core 4 makes the pressure distribution more uniform during the pre-pressing process, ensuring the consistency of product quality.

[0029] The specific usage and function of this embodiment are as follows:

[0030] When using the powder metallurgy die with pre-pressure venting mechanism, the lower die core 3 is first driven to slide upward by the die-closing cylinder 2 located at the middle of the bottom end face of the bottom fixing frame 101, while the upper die core 4 is driven to slide downward by the die-closing cylinder 2 located at the middle of the top end face of the top fixing frame 102, so that the lower die core 3 and the upper die core 4 are precisely closed. During the die-closing process, the outer sliding groove 301 of the lower die core 3 and the sliding guide groove 401 of the upper die core 4 slide along the lower die base 1 and the top fixing frame 102 respectively to ensure accurate movement trajectory. After the die-closing is completed, the pre-pressure cylinder 6 is activated to push the venting seat 5 to slide along the inner guide groove 304 towards the die cavity. At this time, the connecting rods 502 distributed in a ring slide in the venting hole 302. As the pressure is applied, air enters the vent seat 5 through the frustoconical vent hole 302 and is quickly discharged from the mold through the "Y"-shaped vent pipe 503. After pre-pressing, the pre-pressing cylinder 6 retracts, and the reset spring 303 automatically resets the vent seat 5. Then, formal pressing is carried out. The mold closing cylinder 2 continues to provide pressure. Due to the enhanced structural rigidity of the bottom fixing frame 101 and the top fixing frame 102, the pressing process is ensured to be stable and reliable. After pressing, the mold closing cylinder 2 reverses its action, causing the lower mold core 3 and the upper mold core 4 to separate, and the product is removed, completing one pressing cycle. Throughout the process, the symmetrically arranged vent seats 5 enable synchronous venting of the lower mold core 3 and the upper mold core 4, effectively improving venting efficiency and product quality. Example 2

[0031] Several sets of ball bearing assemblies are evenly embedded in the inner wall of the outer sliding groove 301 of the lower mold core 3 and the inner wall of the sliding guide groove 401 of the upper mold core 4. Each set of ball bearing assemblies includes a positioning seat, a ball, and a retainer. The ball can rotate freely around the positioning seat and roll in cooperation with the sliding contact surface of the lower mold base 1. At the same time, an annular groove is opened on the outer wall of the guide cylinder 501 of the vent seat 5, and a spring ball is embedded in it. It forms an elastic snap-fit ​​structure with the positioning hole on the inner wall of the guide groove 304 of the lower mold core 3. The ball bearing assembly converts sliding friction into rolling friction, which reduces the sliding resistance of the mold core, significantly improves the opening and closing speed and smoothness, and reduces the wear of the guide components. The spring ball cooperates with the positioning hole to provide positioning feedback when the vent seat 5 slides to the limit position, avoids excessive displacement, and further improves the movement accuracy of the vent seat 5.

Claims

1. A powder metallurgy press tool with a pre-pressing exhaust mechanism, characterized by, It includes a lower mold base (1); a mold closing cylinder (2) is fixedly connected to the middle of the upper and lower ends of the lower mold base (1); a lower mold core (3) is slidably connected to the upper bottom of the lower mold base (1); an exhaust seat (5) is slidably connected to the bottom end face of the lower mold core (3); an upper mold core (4) is slidably connected to the lower top of the lower mold base (1); and an exhaust seat (5) is slidably connected to the top end face of the upper mold core (4).

2. A powder metallurgy press tool with a pre-press exhaust mechanism according to claim 1, characterized in that, The bottom of the lower mold base (1) is fixedly connected to a concave bottom fixing bracket (101), and the top of the rear side wall of the lower mold base (1) is fixedly installed with an L-shaped top fixing bracket (102).

3. A powder metallurgy press tool with a pre-press exhaust mechanism according to claim 2, characterized in that, The top telescopic end of the mold-closing cylinder (2) fixedly installed at the middle of the bottom end face of the bottom fixing frame (101) is connected to the middle of the bottom end face of the lower mold core (3), and the bottom telescopic end of the mold-closing cylinder (2) fixedly installed at the middle of the top end face of the bottom fixing frame (101) is connected to the middle of the top end face of the upper mold core (4).

4. The powder metallurgy press tool with a pre-press exhaust mechanism according to claim 1, wherein The lower mold core (3) has an outer sliding groove (301) at the bottom of the left and right side walls. The lower mold core (3) has an exhaust hole (302) in a circumferential shape at the bottom end face of the mold cavity. The exhaust hole (302) is truncated cone-shaped. The lower mold core (3) has a reset spring (303) symmetrically installed on the left and right sides of the bottom end face. The other end of the reset spring (303) is connected to the exhaust seat (5). The lower mold core (3) has an annular inner guide groove (304) at the bottom end face.

5. The powder metallurgy press tool with a pre-press exhaust mechanism according to claim 1, wherein The upper mold core (4) is the upper symmetrical structure of the lower mold core (3) and has the same structure. A sliding guide groove (401) is provided in the middle of the rear side wall of the upper mold core (4). The sliding guide groove (401) is slidably connected to the top fixing frame (102) on the top of the rear side wall of the lower mold base (1).

6. The powder metallurgy press tool with a pre-press exhaust mechanism according to claim 1, wherein The exhaust seats (5) are symmetrically provided with two slidably connected to the lower mold core (3) and the upper mold core (4). A guide cylinder (501) is fixedly installed in the middle of the opposite sidewalls of the two exhaust seats (5). The guide cylinder (501) is slidably connected in the inner guide groove (304) of the lower mold core (3). A connecting rod (502) is provided in a ring shape in the exhaust seats (5) outside the guide cylinder (501). The top of the connecting rod (502) is truncated cone-shaped. Two "Y"-shaped exhaust pipes (503) are symmetrically connected on the opposite sidewalls of the two exhaust seats (5). Two pre-pressure cylinders (6) are symmetrically connected on the opposite sidewalls of the two exhaust seats (5). The telescopic end of the pre-pressure cylinder (6) is connected to the opposite sidewalls of the lower mold core (3) and the upper mold core (4).

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