A sintering fixture for metal powder injection molding

Abstract

The present invention relates to the technical field of sintering fixtures, and discloses a sintering fixture for metal powder injection molding, which includes a chassis. A fixing sleeve, a plurality of unloading components and a plurality of supporting components are connected to the upper surface of the chassis. Among them, the fixing sleeve is located in the middle of the chassis, and the plurality of unloading components and the plurality of supporting components are circumferentially distributed around the fixing sleeve, and the plurality of unloading components and the plurality of supporting components are arranged in a cross manner. A sliding component is connected inside the fixing sleeve, and a suspension component and a rotating component are connected to the outer wall of the upper end of the sliding component. The lower end of the suspension component is connected with a plurality of shaping components, and the plurality of shaping components are circumferentially distributed around the sliding component. For this sintering fixture for metal powder injection molding, by arranging a plurality of unloading components and supporting components on the chassis, the blanking can be carried out more quickly and accurately after the workpiece is sintered; by arranging the sliding component, it can be adjusted more appropriately in cooperation with the height and angle changes of the unloading components and the supporting components.

Description

Technical Field

[0001] The present invention relates to the technical field of sintering fixtures, and particularly to a sintering fixture for metal powder injection molding. Background Art

[0002] Metal Powder Injection Molding (MIM) is an advanced powder metallurgy technology that combines traditional powder metallurgy processes with plastic injection molding technology. This process is particularly suitable for manufacturing small metal parts with complex geometries.

[0003] The sintering fixture in Metal Powder Injection Molding (MIM), also known as a sintering jig or support device, is an auxiliary device used to support and fix parts during the sintering process. Sintering is one of the key steps in the MIM process, and its purpose is to make the metal powder particles in the parts diffuse, flow, and finally combine into a dense whole through high-temperature heating. During this process, the parts will undergo a certain amount of shrinkage, which may cause part deformation or other defects if not controlled.

[0004] Currently, the patent with the publication number CN219074367U discloses a sintering fixture. The sintering fixture includes a base body, and the base body has a support surface. The support surface includes: protruding parts arranged at intervals, and the bottom surface of the concave position formed between the protruding parts forms a first support surface; a first recessed part, the bottom surface of the first recessed part has a profiling combined support surface, the profiling combined support surface includes a plurality of profiling surfaces, and the plurality of profiling surfaces are located on different planes so that the bottom surface of the groove forms a stepped convex structure; a second recessed part, arranged on the bottom surface of the first recessed part, and a plurality of second recessed parts are respectively arranged on any one or more profiling surfaces. This sintering fixture can support the product in all directions during the sintering process to prevent deformation.

[0005] However, in the actual use process of the above sintering fixture, the following problems still exist:

[0006] When the workpiece is sintered, it often fits closely to the inner wall of the sintering fixture. At this time, when taking the workpiece out of the fixture, external tools are often needed to take the workpiece out of the interior of the fixture. The overall steps are not only cumbersome, but also the separation efficiency is low. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the present invention provides a sintering fixture for metal powder injection molding to solve the problem that it is inconvenient to take out the workpiece after sintering at present.

[0008] To achieve the above object, the present invention provides the following technical solution: A sintering fixture for metal powder injection molding, comprising a chassis, on the upper surface of the chassis are connected a fixed sleeve, a plurality of unloading components and a plurality of support components. Among them, the fixed sleeve is located in the middle of the chassis, and the plurality of unloading components and the plurality of support components are distributed in a circular pattern around the fixed sleeve, and the plurality of unloading components and the plurality of support components are arranged in a cross pattern. Inside the fixed sleeve is connected a sliding component, on the outer wall of the upper end of the sliding component are connected a hanging component and a rotating component. At the lower end of the hanging component are connected a plurality of shaping components, and the plurality of shaping components are distributed in a circular pattern around the sliding component, and the plurality of shaping components are respectively aligned with the plurality of unloading components and the plurality of support components. At the end of the rotating component away from the sliding component are connected a plurality of shielding components, and the other ends of the plurality of shielding components are respectively aligned with the plurality of shaping components.

[0009] Further, the unloading component includes a connecting plate and a plurality of ejector pins. The bottom surface of the connecting plate is fixedly connected to the upper surface of the chassis, and the upper surface of the connecting plate is fixedly connected to the lower ends of the plurality of ejector pins. The plurality of ejector pins are respectively aligned with the shaping components, and the upper ends of the plurality of ejector pins are in the shape of a slope, where the high end of the slope is located inside and the low end of the slope is located outside.

[0010] Further, the support component includes a support column and a support plate. The lower end of the support column is fixedly connected to the upper surface of the chassis, and the upper end of the support column is fixedly connected to the bottom surface of the support plate. The upper surface of the support plate matches the shaping component.

[0011] Further, the shaping component includes a shaping cover, a bottom plate and a plurality of heightening rods. A plurality of air vents are formed through the upper surface of the bottom plate. The side wall of the bottom plate is fixedly connected to the inner wall of the lower end of the shaping cover. The bottom surface of the shaping cover is fixedly connected to the upper ends of the plurality of heightening rods. The lower ends of the plurality of heightening rods are all in contact with the upper surface of the support plate. The plurality of air vents are respectively aligned with the plurality of ejector pins, and the inner wall of the air vent is slidably connected to the outer wall of the ejector pin. The outer wall of the shaping cover is connected to the hanging component.

[0012] Further, the hanging component includes a support disc and a plurality of support rods. The inner side wall of the support disc is connected to the upper end of the sliding component, and the bottom surface of the outer side wall of the support disc is fixedly connected to the upper ends of the plurality of support rods. The lower ends of the plurality of support rods are respectively fixedly connected to the outer walls of the plurality of shaping covers.

[0013] Further, the sliding component includes an outer column, a middle column and a limiting component. The outer wall of the upper end of the outer column is connected to one end of the rotating component. The lower end of the middle column is fixedly connected to the inner wall of the fixed sleeve. An elevating cavity is formed at the lower end of the outer column. The middle column is located in the elevating cavity, and the outer wall of the middle column is slidably connected to the inner wall of the elevating cavity. A sliding cavity is formed inside the middle column. The lower end of the limiting component is located in the sliding cavity. The upper end of the limiting component passes through the upper ends of the middle column and the outer column to the outside of the outer column and is connected to the other end of the rotating component.

[0014] Further, the limiting component includes an anti - detachment slider, a rotating rod and an inner rod. The outer wall of the anti - detachment slider is slidably connected to the inner wall of the sliding cavity. The upper end of the anti - detachment slider is fixedly connected to the lower end of the inner rod. The upper end of the inner rod passes through the upper end of the middle column to the outside of the middle column and is rotatably connected to the lower end of the rotating rod. The upper end of the rotating rod passes through the upper end of the outer column and is connected to one end of the rotating component. The outer wall of the rotating rod is fixedly connected to the penetration part of the outer column.

[0015] Further, the rotating component includes a support frame, a second gear, several knobs, several connecting rods and several first gears. The second gear is sleeved and rotatably connected to the outer wall of the upper end of the outer column. The middle part of the support frame is fixedly connected to the end of the inner rod passing through the outer column. The other several ends of the support frame are respectively sleeved and rotatably connected to the upper ends of several connecting rods. The lower ends of several connecting rods respectively pass through several first gears to the lower side of the first gears and are respectively connected to several shielding components. The lower ends of several knobs are fixedly connected to the upper surface of the second gear. The second gear meshes with several first gears.

[0016] Further, the shielding component includes a guiding cover and an extended baffle. The upper surface of the guiding cover is fixedly connected to the lower end of the connecting rod. The bottom surface of the guiding cover abuts against the upper surface of the shaping cover. The inner side wall of the extended baffle is fixedly connected to the side wall of the upper end of the guiding cover. A taking - and - placing opening is formed at the lower end of the guiding cover.

[0017] Further, a circumferential sliding groove is formed on the outer wall of the upper end of the middle column. Several vertical sliding grooves are formed on the bottom surface of the circumferential sliding groove. An anti - detachment ring is fixedly connected to the inner wall of the lower end of the outer column. Several guiding sliders are fixedly connected to the inner side wall of the anti - detachment ring. The outer wall of the anti - detachment ring is slidably connected to the outer wall of the middle column. The outer walls of several guiding sliders are respectively slidably connected to the inner walls of several vertical sliding grooves, and the outer walls of several guiding sliders are also slidably connected to the inner wall of the circumferential sliding groove.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. For this metal powder injection molding sintering jig, by arranging several unloading components and supporting components on the chassis, after the workpiece sintering is completed, the blanking can be carried out more quickly and accurately.

[0020] 2. For this metal powder injection molding sintering jig, by arranging the sliding component, it can make more appropriate adjustments in cooperation with the height and angle changes of the unloading component and the supporting component.

[0021] 3. For this metal powder injection molding sintering jig, by arranging the shielding component, it can not only prevent impurities above and on the side of the sintering furnace from falling into the shaping component during the sintering process and contaminating the workpiece, but also limit the sliding direction of the workpiece during subsequent unloading. Description of the Drawings

[0022] Figure 1 Schematic diagram of the overall appearance of the present invention during demolding;

[0023] Figure 2 Schematic diagram of the overall appearance of the present invention during sintering;

[0024] Figure 3 Exploded view of each component of the overall appearance of the present invention;

[0025] Figure 4 For the present invention Figure 3 Enlarged view of part A in;

[0026] Figure 5 For the present invention Figure 3 Enlarged view of part B in;

[0027] Figure 6 Detailed connection diagram of components such as the suspension assembly, shielding assembly and sliding assembly of the present invention;

[0028] Figure 7 For the present invention Figure 6 Partial sectional view of each component in;

[0029] Figure 8 For the present invention Figure 7 Exploded view of each component in;

[0030] Figure 9 For the present invention Figure 8 Detailed connection diagram of part C in;

[0031] Figure 10 Partial structural diagram of the sliding assembly of the present invention;

[0032] Figure 11 Schematic diagrams of two perspectives of the shielding assembly of the present invention.

[0033] In the figure: 1, chassis; 2, pillar; 3, support plate; 4, outer column; 5, support disk; 6, heightening rod; 7, support frame; 8, connecting rod; 9, first gear; 10, second gear; 11, knob; 12, guiding cover; 13, extension baffle; 14, shaping cover; 15, ejector pin; 16, connecting plate; 17, middle column; 18, fixing sleeve; 19, bottom plate; 20, support rod; 21, anti - detachment slider; 22, rotating rod; 23, guiding slider; 24, anti - detachment ring; 25, inner rod; 26, lifting cavity; 27, access opening; 28, vertical sliding groove; 29, sliding cavity; 30, circumferential sliding groove; 31, ventilation opening. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0035] Please refer to Figures 1-11 , a sintering fixture for metal powder injection molding, including a chassis 1. A fixing sleeve 18, a plurality of unloading components and a plurality of support components are connected to the upper surface of the chassis 1. Among them, the fixing sleeve 18 is located in the middle of the chassis 1, and the plurality of unloading components and the plurality of support components are circumferentially distributed around the fixing sleeve 18, and the plurality of unloading components and the plurality of support components are arranged in a cross manner. A sliding component is connected inside the fixing sleeve 18. A suspension component and a rotating component are connected to the outer wall of the upper end of the sliding component. The lower end of the suspension component is connected with a plurality of shaping components. The plurality of shaping components are circumferentially distributed around the sliding component, and the plurality of shaping components are respectively aligned with the plurality of unloading components and the plurality of support components. One end of the rotating component away from the sliding component is connected with a plurality of shielding components, and the other ends of the plurality of shielding components are respectively aligned with the plurality of shaping components.

[0036] As Figures 1 to 11 shown, when the sintering fixture for metal powder injection molding in the present invention is used, the following steps can be followed:

[0037] 1. First, clean the inside of the plurality of shaping components, and then place the plurality of already injection-molded workpieces into the shaping components respectively.

[0038] 2. Then, place the plurality of shaping components with workpieces on top of the plurality of support components respectively, so that the shaping components will not slide down due to gravity or other reasons.

[0039] 3. Subsequently, put the entire sintering fixture (i.e., the chassis 1, the fixing sleeve 18, the plurality of unloading components and the plurality of support components and other components mentioned above) together on the mesh belt in the sintering furnace, and then it is transported to the sintering furnace through the mesh belt for sintering.

[0040] 4. When the sintering fixture is taken out of the sintering furnace and cooled, at this time, the worker manually or the robotic arm rotates the rotating component to one side.

[0041] 5. While the rotating component rotates, the part of it connected to the sliding component will take the fixing sleeve 18 as the central axis, driving the shielding component to rotate. At this time, the opening of the shielding component changes from the original inward direction to the outward direction.

[0042] 6. Then, rotate the rotating component and the sliding component at the same time. After the sliding component rotates, it can drive the connected suspension component on the surface to rotate.

[0043] 7. After the suspension component rotates, the shaping component connected to the suspension component can move from the original support component to above the blanking component. At the same time, since the rotating component rotates together, the shielding component will also move to above the blanking component together.

[0044] 8. Then release the rotating component and the sliding component. At this time, since there is no support from the support component below, the shaping component will slide down under the action of its own gravity.

[0045] 9. While the shaping component slides down, the bottom of the shaping component contacts the blanking component. When the shaping component continues to descend, the workpiece located inside the shaping component will be resisted by the blanking component, so that the workpiece will not continue to descend.

[0046] 10. When the shaping component slides down to contact the chassis 1, the workpiece also just separates from the shaping component. And because the upper end of the blanking component presents an inclined plane, the workpiece separated from the shaping component will slide directly along the slope to the outside of the chassis 1, and then can be collected manually or by mechanical equipment.

[0047] 11. After the workpiece slides away from the blanking component, pull the shaping component up again manually or by a robotic arm and other equipment, and stop after the shaping component moves above the support component.

[0048] 12. While the shaping component stops, load a new workpiece into the shaping component again manually or by a robotic arm.

[0049] 13. Then rotate the shaping component and the workpiece back above the support component again (there are also separate rotations here, which has no impact), and the above steps 2-10 can be repeated.

[0050] It should be particularly noted here that:

[0051] 1. The injection molding of the workpiece is a very mature technology in the existing process and has nothing to do with this solution, so it will not be described in detail here.

[0052] 2. When the workpiece is placed in the shaping component, it can be placed manually or by an external robotic arm. This is also an existing operation technology, so it will not be described in detail.

[0053] 3. The sintering furnace and the sintering furnace mesh belt are also mature technologies in the existing process and have nothing to do with this solution, so they will not be described in detail here.

[0054] As a preferred solution of the present invention, the unloading assembly includes a connecting plate 16 and a plurality of ejector pins 15, the bottom surface of the connecting plate 16 is fixedly connected to the upper surface of the chassis 1, the upper surface of the connecting plate 16 is fixedly connected to the lower ends of the plurality of ejector pins 15, the plurality of ejector pins 15 are all matched and aligned with the shaping assembly, and the upper ends of the plurality of ejector pins 15 are sloped, wherein the high end of the slope is located on the inner side, and the low end of the slope is located on the outer side.

[0055] More specifically, after sintering, the shaping component rotates to the top of the connecting plate 16 and is aligned with the ejector pin 15. The shaping component is then released and will naturally fall due to gravity. During the falling process, the workpiece inside the shaping component will first contact the highest ejector pin 15. Then, the shaping component will continue to fall due to gravity, but the workpiece will stop falling when blocked by the ejector pin 15 until the shaping component falls onto the chassis 1 and is completely separated from the workpiece. At this time, the workpiece will instantly slide to the lower end due to uneven force and can then leave the area of the chassis 1.

[0056] Special mention should be made here:

[0057] 1. Because the outside of the workpiece fits closely to the inner wall of the shaped component after sintering, if gravity cannot cause it to slide naturally, a little extra pressure can be applied to help it slide.

[0058] 2. When the workpiece is pressed against the ejector pin 15, the workpiece is likely to press against the inner wall of the forming component, causing a slight "stuck" condition. At this time, additional pressure can be applied by pressing to assist the forming component to slide down.

[0059] As a preferred solution of the present invention, the support assembly includes a pillar 2 and a support plate 3, the lower end of the pillar 2 is fixedly connected to the upper surface of the chassis 1, the upper end of the pillar 2 is fixedly connected to the bottom surface of the support plate 3, and the upper surface of the support plate 3 matches the shaping assembly.

[0060] More specifically, after the workpiece is placed in the shaping assembly, until the sintering and cooling are completed, the shaping assembly will always be placed on the support plate 3 without shaking or sliding.

[0061] As a preferred embodiment of the present invention, the shaping component includes a shaping cover 14, a base plate 19 and a plurality of height-increasing rods 6. A plurality of air holes 31 are formed through the upper surface of the base plate 19. The side wall of the base plate 19 is fixedly connected to the inner wall of the lower end of the shaping cover 14. The bottom surface of the shaping cover 14 is fixedly connected to the upper ends of the plurality of height-increasing rods 6. The lower ends of the plurality of height-increasing rods 6 are all against the upper surface of the support plate 3. The plurality of air holes 31 are respectively matched and aligned with a plurality of ejector pins 15. The inner wall of the air hole 31 is slidably connected to the outer wall of the ejector pin 15. The outer wall of the shaping cover 14 is connected to the suspension component.

[0062] More specifically, when sintering a workpiece is required, the workpiece is first placed on the bottom plate 19 inside the shaping cover 14, and then the workpiece is sintered normally. After sintering, when the shaping cover 14 rotates above the connecting plate 16 and the air vent 31 is aligned with the ejector pin 15, at this time, the shaping cover 14 falls naturally due to gravity. While falling, the air vent 31 slides down from the outside of the ejector pin 15. Therefore, the ejector pin 15 can hold the workpiece located on the bottom plate 19 until it finally slides up along the ejector pin 15 to the outside of the chassis 1.

[0063] It should be specifically noted here that:

[0064] 1. By setting the air vent 31 and the heightening rod 6, a certain height can be provided between the bottom of the workpiece and the support assembly, so that both the upper and lower sides of the workpiece can be heated during the sintering process.

[0065] 2. The aperture of the air vent 31 is larger than the diameter of the ejector pin 15, which can avoid friction between the air vent 31 and the ejector pin 15, reduce the frictional force, and at the same time reduce the wear rate.

[0066] 3. During actual sintering, the workpiece may be of various shapes. Therefore, the inner wall of the shaping cover 14 can also be of any shape. For the convenience of display and understanding in the figure, the inner wall of the shaping cover 14 is set to be cylindrical, but it does not mean that the shaping cover 14 can only be cylindrical.

[0067] As a preferred embodiment of the present invention, the suspension assembly includes a support disk 5 and a plurality of support rods 20. The inner side wall of the support disk 5 is connected to the upper end of the sliding assembly, the bottom surface of the outer side wall of the support disk 5 is fixedly connected to the upper ends of the plurality of support rods 20, and the lower ends of the plurality of support rods 20 are respectively fixedly connected to the outer walls of the plurality of shaping covers 14.

[0068] More specifically, the support disk 5 and the plurality of support rods 20 are mainly used to connect the sliding assembly and the shaping cover 14, and at the same time have a certain height, which is convenient for leaving enough height for the ejector pin 15 to slide out after pushing the workpiece out of the shaping cover 14, and will not be stuck between the shaping cover 14 and the shielding assembly.

[0069] As a preferred embodiment of the present invention, the sliding assembly includes an outer column 4, a middle column 17 and a limiting assembly. The outer wall of the upper end of the outer column 4 is connected to one end of the rotating assembly, the lower end of the middle column 17 is fixedly connected to the inner wall of the fixed sleeve 18, a lifting cavity 26 is opened at the lower end of the outer column 4, the middle column 17 is located in the lifting cavity 26, and the outer wall of the middle column 17 is slidably connected to the inner wall of the lifting cavity 26. A sliding cavity 29 is opened inside the middle column 17, the lower end of the limiting assembly is located in the sliding cavity 29, and the upper end of the limiting assembly passes through the upper end of the middle column 17 and the upper end of the outer column 4 to the outside of the outer column 4 and is connected to the other end of the rotating assembly.

[0070] More specifically, after the first batch of sintered workpieces are ejected by the ejector pin 15 and slide to the outside of the chassis 1, at this time, the support plate 5 and the support rod 20 are pulled up (only up, and the shaping cover 14 is located above the ejector pin 15 at this time). While the shaping cover 14 is moving up, the outer column 4 slides up outside the middle column 17 through the lifting cavity 26, and the limiting component located in the sliding cavity 29 inside the middle column 17 will also rise along with the sliding cavity 29. Subsequently, the workpieces to be sintered are reloaded into the shaping cover 14 manually or by a robotic arm. After loading is completed, the rotating component and the outer column 4 are rotated to one side. After the rotating component rotates, it will drive the shielding component to rotate together. While the shielding component is rotating, the shielding component changes from the original opening facing outwards to the opening facing inwards, and after the outer column 4 rotates, the shaping cover 14 can be rotated to the upper part of the support plate 3 and then remains stationary (so far, the shaping cover 14, the outer column 4, the limiting component, etc. all remain stationary).

[0071] When the second batch of workpieces mentioned above is also sintered, at this time, the shaping cover 14 is rotated again, and thus the outer column 4 and the limiting component, etc. will also rotate together. When the shaping cover 14 drops due to gravity, at this time, the outer column 4 and the limiting component will be sleeved on and received outside and inside the middle column 17 again.

[0072] As a preferred solution of the present invention, the limiting component includes an anti - detachment slider 21, a rotating rod 22 and an inner rod 25. The outer wall of the anti - detachment slider 21 is slidably connected with the inner wall of the sliding cavity 29. The upper end of the anti - detachment slider 21 is fixedly connected with the lower end of the inner rod 25. The upper end of the inner rod 25 penetrates through the upper end of the middle column 17 to the outside of the middle column 17 and is rotatably connected with the lower end of the rotating rod 22. The upper end of the rotating rod 22 penetrates through the upper end of the outer column 4 and is connected with one end of the rotating component. The outer wall of the rotating rod 22 is fixedly connected with the penetrating part of the outer column 4.

[0073] More specifically, when the shaping cover 14 is sleeved outside the ejector pin 15, at this time, the outer column 4 is sleeved outside the middle column 17, and the anti - detachment slider 21 and the inner rod 25 are both located in the sliding cavity 29 of the middle column 17 (the rotating rod 22 is connected inside the outer column 4).

[0074] When the shaping cover 14 is located on the support plate 3, at this time, the outer column 4 slides to the uppermost end of the middle column 17, and the anti - detachment slider 21 will also move to the uppermost end along the sliding cavity 29. At the same time, the inner rod 25 can make up for the height difference between the outer column 4 and the middle column 17, so it will not affect the subsequent normal steps.

[0075] It should be particularly noted here that:

[0076] The rotating rod 22 and the inner rod 25 are provided because the rotating component needs to achieve two effects:

[0077] 1. Control the rotation of the shaping cover 14, etc. to achieve the purpose of loading and unloading.

[0078] 2. While the shaping cover 14 is rotating, it is also necessary to drive the shielding component to rotate. Therefore, in order to prevent the rotation between the two from conflicting, the rotation component is restricted by the rectangular inner rod 25, so that a part of the rotation component will not rotate together with another part; and the anti-detachment slider 21, the rotating rod 22 and the inner rod 25 can move up and down together with the outer column 4 through the connection between the cylindrical rotating rod 22 and the outer column 4, without affecting the normal rotation of the outer column 4 itself.

[0079] As a preferred embodiment of the present invention, the rotation component includes a support frame 7, a second gear 10, a plurality of knobs 11, a plurality of connecting rods 8 and a plurality of first gears 9. The second gear 10 is sleeved and rotatably connected to the outer wall of the upper end of the outer column 4. The middle part of the support frame 7 is fixedly connected to one end of the inner rod 25 passing through the outer column 4. The other ends of the support frame 7 are respectively sleeved and rotatably connected to the upper ends of the plurality of connecting rods 8. The lower ends of the plurality of connecting rods 8 respectively pass through the plurality of first gears 9 to the lower side of the first gears 9 and are respectively connected to the plurality of shielding components. The lower ends of the plurality of knobs 11 are fixedly connected to the upper surface of the second gear 10, and the second gear 10 meshes with the plurality of first gears 9.

[0080] More specifically, when it is necessary to control the rotation of the shaping cover 14 and the shielding component, only need to manually rotate the knob 11. After the knob 11 rotates, it can drive the second gear 10 to rotate in the same direction. After the second gear 10 rotates, it can rotate around the axis of the middle outer column 4. And during the rotation, through meshing, it drives the plurality of first gears 9 to rotate. And because of the knob 11, when the knob 11 rotates from one side to the middle, it can just control the first gear 9 to rotate 180°, thus realizing the conversion of the opening facing inwards and outwards.

[0081] After the opening direction is adjusted, only need to rotate the second gear 10 and the support frame 7 at the same time. At this time, when the support frame 7 rotates, it can drive the outer column 4 to rotate, and then drive the shaping cover 14 to rotate through the suspension component.

[0082] It should be particularly noted here that:

[0083] 1. When the support frame 7 rotates, the first gear 9 connected above it will also rotate together. And because the second gear 10 is also rotating, they do not form meshing with each other, so the opening direction will not be changed.

[0084] 2. The number of teeth of the second gear 10 is much more than that of the first gear 9. Taking the attached drawings as an example, when the number of support components and unloading components is four each, at this time, the shaping cover 14 only needs to rotate 45° from the support component to the unloading component. Since the opening of the shielding component must rotate 180° from the inner side to the outer side, the number of teeth of the first gear 9 is only one-fourth of that of the second gear 10 at this time.

[0085] As a preferred embodiment of the present invention, the shielding component includes a guiding cover 12 and an extended baffle 13. The upper surface of the guiding cover 12 is fixedly connected to the lower end of the connecting rod 8. The bottom surface of the guiding cover 12 abuts against the upper surface of the shaping cover 14. The inner side wall of the extended baffle 13 is fixedly connected to the side wall at the upper end of the guiding cover 12. A pick-and-place opening 27 is formed at the lower end of the guiding cover 12.

[0086] More specifically, during the sintering process, due to the action of the extended baffle 13 above the guiding cover 12 at this time, impurities dripping from above the sintering furnace will be blocked, and the guiding cover 12 itself will also block impurities that may adhere to the side wall of the sintering furnace, thereby enhancing the protection effect.

[0087] After sintering is completed, since the direction of the pick-and-place opening 27 of the guiding cover 12 changes from inward to outward, the workpiece located on the ejector pin 15 can only slide out in the direction of the pick-and-place opening 27 facing outward.

[0088] As a preferred embodiment of the present invention, a circumferential chute 30 is formed on the outer wall at the upper end of the middle column 17. A plurality of vertical chutes 28 are formed on the bottom surface of the circumferential chute 30. An anti-disengagement ring 24 is fixedly connected to the inner wall at the lower end of the outer column 4. A plurality of guiding sliders 23 are fixedly connected to the inner side wall of the anti-disengagement ring 24. The outer wall of the anti-disengagement ring 24 is slidably connected to the outer wall of the middle column 17. The outer walls of the plurality of guiding sliders 23 are respectively slidably connected to the inner walls of the plurality of vertical chutes 28, and the outer walls of the plurality of guiding sliders 23 are all slidably connected to the inner wall of the circumferential chute 30.

[0089] More specifically, by providing the circumferential chute 30, the vertical chute 28, the anti-disengagement ring 24, and the guiding slider 23, first, the movement trajectory of the outer column 4 on the surface of the middle column 17 can be assisted, enabling it to move only in a specific direction; second, when the outer column 4 is rotated, when the guiding slider 23 aligns with the vertical chute 28, since the lower part of the guiding slider 23 is pointed and the upper end of the vertical chute 28 is open, there will be an obvious sense of jerk, so that the worker can clearly know that the air vent 31 is exactly aligned with the ejector pin 15 at this time (if it is operated by a robotic arm, because it is programmed, it can be more intuitively known at what position it arrives).

[0090] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sintering fixture for metal powder injection molding, characterized in that: It includes a chassis (1), on the upper surface of which a fixed sleeve (18), a number of discharging components and a number of supporting components are connected. The fixed sleeve (18) is located in the middle of the chassis (1), and the number of discharging components and the number of supporting components are circumferentially distributed around the fixed sleeve (18), and the number of discharging components and the number of supporting components are arranged in a cross - setting. A sliding component is connected inside the fixed sleeve (18), on the outer wall of the upper end of the sliding component, a hanging component and a rotating component are connected. At the lower end of the hanging component, a number of shaping components are connected. The number of shaping components are circumferentially distributed around the sliding component, and the number of shaping components are respectively matched and aligned with the number of discharging components and the number of supporting components. At the end of the rotating component far from the sliding component, a number of shielding components are connected, and the other ends of the number of shielding components are respectively matched and aligned with the number of shaping components; The discharging component includes a connecting plate (16) and a number of ejector pins (15). The bottom surface of the connecting plate (16) is fixedly connected to the upper surface of the chassis (1), and the upper surface of the connecting plate (16) is fixedly connected to the lower ends of the number of ejector pins (15). The number of ejector pins (15) are all matched and aligned with the shaping components, and the upper ends of the number of ejector pins (15) are in the shape of a slope, where the high - end of the slope is located inside and the low - end of the slope is located outside; The supporting component includes a support column (2) and a support plate (3). The lower end of the support column (2) is fixedly connected to the upper surface of the chassis (1), and the upper end of the support column (2) is fixedly connected to the bottom surface of the support plate (3). The upper surface of the support plate (3) is matched with the shaping component; The shaping component includes a shaping cover (14), a bottom plate (19) and a number of height - increasing rods (6); The rotating component includes a support frame (7), a second gear (10), a number of knobs (11), a number of connecting rods (8) and a number of first gears (9); The shielding component includes a guiding cover (12) and an extended baffle (13). The upper surface of the guiding cover (12) is fixedly connected to the lower end of the connecting rod (8). The bottom surface of the guiding cover (12) abuts against the upper surface of the shaping cover (14). The inner side wall of the extended baffle (13) is fixedly connected to the side wall at the upper end of the guiding cover (12). A pick - up and placement opening (27) is opened at the lower end of the guiding cover (12).

2. The metal powder injection molding sintering fixture according to claim 1, characterized in that: A number of air - permeable openings (31) are penetrated through the upper surface of the bottom plate (19). The side wall of the bottom plate (19) is fixedly connected to the inner wall at the lower end of the shaping cover (14). The bottom surface of the shaping cover (14) is fixedly connected to the upper ends of the number of height - increasing rods (6). The lower ends of the number of height - increasing rods (6) all abut against the upper surface of the support plate (3). The number of air - permeable openings (31) are respectively matched and aligned with the number of ejector pins (15), and the inner wall of the air - permeable opening (31) is slidably connected to the outer wall of the ejector pin (15). The outer wall of the shaping cover (14) is connected to the hanging component.

3. The sintering fixture for metal powder injection molding according to claim 2, wherein: The suspension assembly includes a support disk (5) and a plurality of support rods (20). The inner side wall of the support disk (5) is connected to the upper end of the sliding assembly. The bottom surface of the outer side wall of the support disk (5) is fixedly connected to the upper ends of the plurality of support rods (20). The lower ends of the plurality of support rods (20) are respectively fixedly connected to the outer walls of the plurality of shaping covers (14).

4. The metal powder injection molding sintering fixture according to claim 3, characterized in that: The sliding assembly includes an outer column (4), a middle column (17) and a limiting assembly. The outer wall of the upper end of the outer column (4) is connected to one end of the rotating assembly. The lower end of the middle column (17) is fixedly connected to the inner wall of the fixed sleeve (18). A lifting cavity (26) is formed at the lower end of the outer column (4). The middle column (17) is located in the lifting cavity (26), and the outer wall of the middle column (17) is slidably connected to the inner wall of the lifting cavity (26). A sliding cavity (29) is formed inside the middle column (17). The lower end of the limiting assembly is located in the sliding cavity (29). The upper end of the limiting assembly penetrates through the upper ends of the middle column (17) and the outer column (4) to the outside of the outer column (4), and is connected to the other end of the rotating assembly.

5. The metal powder injection molding sintering fixture according to claim 4, wherein: The limiting assembly includes an anti - detachment slider (21), a rotating rod (22) and an inner rod (25). The outer wall of the anti - detachment slider (21) is slidably connected to the inner wall of the sliding cavity (29). The upper end of the anti - detachment slider (21) is fixedly connected to the lower end of the inner rod (25). The upper end of the inner rod (25) penetrates through the upper end of the middle column (17) to the outside of the middle column (17), and is rotatably connected to the lower end of the rotating rod (22). The upper end of the rotating rod (22) penetrates through the upper end of the outer column (4), and is connected to one end of the rotating assembly. The outer wall of the rotating rod (22) is fixedly connected to the penetration part of the outer column (4).

6. The metal powder injection molding sintering fixture according to claim 5, wherein: The second gear (10) is sleeved and rotatably connected to the outer wall of the upper end of the outer column (4). The middle part of the support frame (7) is fixedly connected to the end of the inner rod (25) penetrating through the outer column (4). The other several ends of the support frame (7) are respectively sleeved and rotatably connected to the upper ends of a plurality of connecting rods (8). The lower ends of the plurality of connecting rods (8) respectively penetrate through the plurality of first gears (9) to the lower side of the first gears (9), and are respectively connected to a plurality of shielding assemblies. The lower ends of the plurality of knobs (11) are fixedly connected to the upper surface of the second gear (10). The second gear (10) meshes with the plurality of first gears (9).

7. The metal powder injection molding sintering fixture according to claim 6, characterized in that: A circumferential sliding groove (30) is formed on the outer wall of the upper end of the middle column (17). A plurality of vertical sliding grooves (28) are formed on the bottom surface of the circumferential sliding groove (30). An anti - detachment ring (24) is fixedly connected to the inner wall of the lower end of the outer column (4). A plurality of guiding sliders (23) are fixedly connected to the inner side wall of the anti - detachment ring (24). The outer wall of the anti - detachment ring (24) is slidably connected to the outer wall of the middle column (17). The outer walls of the plurality of guiding sliders (23) are respectively slidably connected to the inner walls of the plurality of vertical sliding grooves (28), and the outer walls of the plurality of guiding sliders (23) are also slidably connected to the inner wall of the circumferential sliding groove (30).

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