Powder metallurgy injection molding device and method thereof

Abstract

The powder metallurgy injection molding device comprises a workbench, a mixing mechanism is fixedly installed on the other side of the top of the workbench, a defoaming mechanism is fixedly installed on the side, close to the mixing mechanism, of the top of the workbench, and a driving mechanism is installed on the other side of a mixing box through a protective cover. The mixing mechanism, the injection mechanism, the mounting base and the mold assembly are driven by the driving mechanism to synchronously operate, screening, mixing, homogenizing, injection, space sealing, mold closing and mold opening of raw materials can be achieved, energy consumption generated by device work is reduced, powder can be more homogenized by screening powder through the screening assembly, and the production efficiency is improved. According to the defoaming device for the powder, the phenomenon of bubble retention caused by particle size difference in the defoaming process is reduced, gas in the mixture is pumped out through the vacuum pump, generation of bubbles is effectively reduced, residual bubbles are eliminated, and the defoamed powder can form a more compact and uniform product structure in subsequent processing, so that the overall quality and performance of the product are improved.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy, in particular to a powder metallurgy injection molding device and a method thereof. Background Art

[0002] Powder metallurgy injection molding is a new type of powder metallurgy near-net molding technology derived from the plastic injection molding industry. It integrates the cross-disciplinary knowledge of plastic molding technology, polymer chemistry, powder metallurgy technology and metal materials science. It uses metal powder or a mixture of metal powder and non-metallic powder as raw materials. The organic binder is injected into the mold cavity by the injection molding machine under the heated plastic state to solidify the molded blank, and the product shape is formed by the mold. High-density, high-precision, three-dimensional complex-shaped structural parts are quickly manufactured through sintering. Powder metallurgy injection molding technology is widely used in electronic information engineering, biomedical equipment, office equipment, automobiles, machinery, hardware, sports equipment, watch industry, weapons and aerospace and other industrial fields.

[0003] However, in actual use, similar structures still have many defects. For example, they do not have the function of degassing. If bubbles remain in the product, it will affect its density, mechanical properties and appearance quality. Incomplete degassing can easily lead to defects such as blistering and cracks, resulting in a decrease in the yield rate. For this reason, we propose a powder metallurgy injection molding device and method to solve the existing problems. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art, such as: the lack of degassing function, if bubbles remain in the product, it will affect its density, mechanical properties and appearance quality, incomplete degassing can easily lead to defects such as blistering and cracks, resulting in a decrease in the yield rate.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A powder metallurgy injection molding device comprises a workbench, a mounting box is fixedly mounted on one side of the top of the workbench, a mounting seat is embedded and mounted on one side of the mounting box, a mold assembly is fixedly mounted on one side of the mounting seat, and the mold assembly is placed inside the mounting box;

[0007] A mixing mechanism is fixedly installed on the other side of the top of the workbench, and the mixing mechanism includes a mixing tank fixedly installed on the top of the workbench, a mixing box is fixedly installed on the bottom of the mixing tank, a stirring rod is rotatably installed at the bottom of the mixing box, a driven bevel gear is installed on the top of the stirring rod through a connecting rod, a screening assembly is movably installed inside the mixing tank, a transmission rod extending to the inside of the mixing box is fixedly installed at the bottom of the screening assembly, a stirring paddle is sleeved on the outer side of the transmission rod, and a driven bevel gear is fixedly installed on the bottom end of the transmission rod;

[0008] An injection mechanism is installed on one side of the mixing box, one end of the injection mechanism is connected to the mounting seat, a degassing mechanism is fixedly installed on the top of the workbench close to the mixing mechanism, and a driving mechanism is installed on the other side of the mixing box through a protective cover, and the driving mechanism is respectively connected to the mixing mechanism, the injection mechanism, the mounting seat and the mold assembly.

[0009] Furthermore, the screening assembly includes a rotating disk rotatably installed inside the mixing tank, and a screening disk movably installed inside the mixing tank through a slide groove. Inclined wedges are equidistantly installed on the top of the rotating disk, and resistance rods are equidistantly installed on the bottom of the screening disk. When the resistance rods pass through the inclined wedges, the screening disk vibrates vertically, thereby realizing vertical vibration screening of the powder on the top of the screening disk.

[0010] Furthermore, the injection mechanism comprises an injection tube fixedly mounted on one side of the mixing box, a second heater is sleeved on the outer side of the injection tube, and a screw is rotatably mounted inside the injection tube.

[0011] Furthermore, a valve disc is rotatably mounted inside the mounting seat, and material passage holes are equidistantly provided inside the valve disc.

[0012] Furthermore, the mold assembly includes a sliding rod fixedly installed on the inner wall of the mounting box, and a fixed mold fixedly installed on one side of the mounting seat, a demolding hole is opened on one side of the fixed mold, a movable seat is movably installed on the outer side of the sliding rod, a wire set is embedded in the interior of the movable seat, a reciprocating screw rod is installed inside the wire set, and a movable mold is fixedly installed on one side of the movable seat.

[0013] Furthermore, the driving mechanism includes a speed regulating motor installed inside the protective box, a first pulley group is fixedly installed on the output end of the speed regulating motor, a bevel gear rod extending to the inside of the mixing box is fixedly installed on the top of one side of the first pulley group, and the top of one end of the bevel gear rod is meshed and connected with the driven bevel gear at the bottom of the transmission rod, the bottom of one end of the bevel gear rod is meshed and connected with the driven bevel gear at the top of the stirring rod, one end of the bevel gear rod is fixedly connected to one end of the screw through a connecting rod, a second pulley group is installed on the bottom of one side of the first pulley group through a linkage rod, the top of one side of the second pulley group is fixedly connected to the reciprocating screw through a connecting rod, and the bottom of one side of the second pulley group is clamped to the valve disc through a clamping rod.

[0014] Furthermore, the degassing mechanism includes a high-pressure gas tank fixedly installed on one side of the top of the workbench, a negative pressure pump is installed at the bottom of the high-pressure gas tank through a pipeline, the suction end of the negative pressure pump is connected to the mixing box through a negative pressure pipe, and a solenoid valve is fixedly installed on the top of the high-pressure gas tank through a high-pressure pipe, the solenoid valve is fixedly installed on one side of the fixed mold, and the solenoid valve is connected to the demolding air hole.

[0015] Furthermore, a controller is fixedly installed on the top of the workbench, a protection box is fixedly installed on one side of the top of the workbench, and the speed regulating motor and the negative pressure pump are both fixedly installed inside the protection box.

[0016] A powder metallurgy injection molding method, the injection molding method comprising the following steps:

[0017] Step 1: The driving mechanism drives the mixing mechanism, the injection mechanism, the mounting seat, and the mold assembly to operate synchronously, and the powder is put into the mixing tank. The powder is screened by the running screening assembly and then falls into the bottom of the mixing tank. The raw materials in the mixing tank are heated and melted by the first heater, and the raw materials are mixed by the rotating stirring paddle. The mixed molten raw materials enter the mixing box, and are stirred, mixed, and exhausted by the rotating stirring rod.

[0018] Step 2: When the molten raw materials are stirred and mixed, the negative pressure pump extracts the vacuum inside the mixing box through the negative pressure pipe, and transports the sucked air to the high-pressure gas tank for storage, so as to remove bubbles from the molten raw materials. After the removal of bubbles, the molten raw materials are injected under the push of the rotating screw, and the raw materials inside the injection tube are further heated by the running second heater to ensure the fluidity of the molten raw materials;

[0019] Step 3: When the raw material is pushed to the discharge port of the injection tube for injection, the movable mold and the fixed mold are docked and closed to form a mold cavity. At this time, the rotating valve disc drives the material hole to dock with the fixed mold and the discharge port of the injection tube, and the raw material inside the injection tube is injected into the mold cavity through the material hole. When the raw material injection is completed, the controller controls the speed regulating motor to stop running;

[0020] Step 4: The raw material is cooled in the mold cavity to form a product. When the product is demolded, the solenoid valve is opened, and the high-pressure gas stored in the high-pressure gas tank is transported to the solenoid valve through the high-pressure pipe. The solenoid valve transports the high-pressure gas to the mold cavity through the demolding air hole to strip the gas from the product in the mold cavity. When the movable mold is separated from the fixed mold, the product is automatically demolded.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention drives the mixing mechanism, the injection mechanism, the mounting seat, and the mold assembly to operate synchronously through a driving mechanism, so as to realize the screening, mixing, material equalization, injection, closed space, mold closing, and mold opening of raw materials, thereby reducing the energy consumption generated by the operation of the device. The powder can be screened by the screening assembly to make the powder more uniform, which is helpful to reduce the bubble retention phenomenon caused by the particle size difference during the degassing process. When the powder with uniform particle size is stirred, the bubbles are more easily discharged, and the fluidity of the metal powder can be improved, so that the powder is more evenly distributed in the degassing container, thereby accelerating the rise and discharge of bubbles. The powder with uniform particle size can be more densely stacked together during pressing, thereby reducing the generation of pores and bubbles.

[0023] The raw materials in the mixing tank are mixed by a stirring paddle and the raw materials inside the mixing box are mixed by a stirring rod to ensure uniform mixing and avoid the generation of local bubbles. The mixed raw materials are vacuum degassed in cooperation with the degassing mechanism, and the gas in the mixture is extracted by a vacuum pump to effectively reduce the generation of bubbles and eliminate residual bubbles. The degassed powder can form a denser and more uniform product structure in subsequent processing, thereby improving the overall quality and performance of the product. The gas generated by vacuum extraction is used to perform gas stripping and demoulding of the product in the mold assembly, which ensures the integrity of the product during demoulding, facilitates subsequent product unloading, and improves the injection molding efficiency of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front structural schematic diagram of the present invention;

[0025] Figure 2 It is a back schematic diagram of the present invention;

[0026] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0027] Figure 4 Schematic diagram of the cross-sectional structure of the present invention

[0028] Figure 5 It is a schematic diagram of the internal structure of the installation box of the present invention;

[0029] Figure 6 It is a schematic diagram of the local structure of the installation box of the present invention;

[0030] Figure 7 It is a schematic diagram of the internal structure of the mixing mechanism of the present invention;

[0031] Figure 8 It is a schematic diagram of the local structure of the screening assembly of the present invention;

[0032] Fig. 9 It is a schematic diagram of the internal structure of the mixing box of the present invention;

[0033] Fig.10It is a schematic diagram of the local structure of the injection mechanism of the present invention;

[0034] Fig.11 It is a schematic diagram of the local structure of the driving mechanism of the present invention;

[0035] Fig.12 It is a schematic diagram of the internal structure of the mold assembly of the present invention;

[0036] Fig.13 It is a partial structural schematic diagram of the degassing mechanism of the present invention;

[0037] Fig.14 It is a schematic diagram of the internal structure of the fixed mold of the present invention.

[0038] In the figure: 1. workbench; 101. controller; 102. protection box; 2. mixing mechanism; 201. mixing tank; 202. first heater; 203. mixing box; 204. transmission rod; 205. driven bevel gear; 206. stirring paddle; 207. screening assembly; 2071. rotating disk; 2072. screening disk; 2073. resistance rod; 2074. inclined wedge; 208. stirring rod; 3. injection mechanism; 301. injection tube; 302. second heater; 303. screw; 4. installation box; 5. Mounting seat; 501, valve disc; 502, material passage hole; 6, driving mechanism; 601, speed regulating motor; 602, first pulley group; 603, bevel gear rod; 604, linkage rod; 605, second pulley group; 7, mold assembly; 701, sliding rod; 702, moving seat; 703, wire set; 704, reciprocating screw rod; 705, moving mold; 706, fixed mold; 707, demoulding air hole; 8, degassing mechanism; 801, high-pressure gas tank; 802, negative pressure pump; 803, high-pressure pipe; 804, solenoid valve. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] See also Figure 1-14 The present invention provides a powder metallurgy injection molding device, comprising a workbench 1, a mounting box 4 is fixedly mounted on one side of the top of the workbench 1, a mounting seat 5 is embedded and mounted on one side of the mounting box 4, a mold assembly 7 is fixedly mounted on one side of the mounting seat 5, and the mold assembly 7 is placed inside the mounting box 4;

[0043] A mixing mechanism 2 is fixedly installed on the other side of the top of the workbench 1, and the mixing mechanism 2 includes a mixing tank 201 fixedly installed on the top of the workbench 1, a mixing box 203 is fixedly installed on the bottom of the mixing tank 201, a stirring rod 208 is rotatably installed at the bottom of the mixing box 203, a driven bevel gear 205 is installed on the top of the stirring rod 208 through a connecting rod, a screening assembly 207 is movably installed inside the mixing tank 201, a transmission rod 204 extending to the inside of the mixing box 203 is fixedly installed at the bottom of the screening assembly 207, a stirring paddle 206 is sleeved on the outer side of the transmission rod 204, and a driven bevel gear 205 is fixedly installed on the bottom end of the transmission rod 204;

[0044] An injection mechanism 3 is installed through one side of the mixing box 203, and one end of the injection mechanism 3 is connected to the mounting seat 5. A degassing mechanism 8 is fixedly installed on the top of the workbench 1 near the mixing mechanism 2. A driving mechanism 6 is installed on the other side of the mixing box 203 through a protective cover. The driving mechanism 6 is respectively connected to the mixing mechanism 2, the injection mechanism 3, the mounting seat 5, and the mold assembly 7.

[0045] It should be noted that: a track door is installed on the front of the installation box 4 through the slide rail groove. Closing the track door can make the interior of the installation box 4 form a closed whole, protect the internal mold assembly 7 from external damage, and ensure the safety of injection when injecting raw materials into the mold assembly 7, avoid scalding accidents caused by overflow of excess raw materials, and improve the safety effect of the device;

[0046] A protective cover is fixedly installed on one side of the interior of the mixing box 203. The protective cover is sleeved on the outer sides of the driven bevel gear 205 and the bevel gear rod 603 to protect the driven bevel gear 205 driven by the bevel gear rod 603, so as to prevent the molten raw materials from sticking to the surfaces of the driven bevel gear 205 and the bevel gear rod 603 and causing transmission jamming, thereby ensuring the transmission stability of the driven bevel gear 205 and the bevel gear rod 603.

[0047] The stirring paddle 206 is composed of a stirring support and a stirring scraper, and the stirring support is attached to the inner wall of the mixing tank 201. The stirring scraper rotates under the driving of the rotating stirring support, and the rotating stirring scraper rotates on its own. The self-rotating stirring scraper can speed up the mixing of the raw materials inside the mixing tank 201, thereby improving the mixing efficiency of the raw materials inside the mixing tank 201. At the same time, the rotating stirring support and the stirring scraper can clean the inner wall of the mixing tank 201 to avoid residual raw materials, thereby reducing the subsequent cleaning burden of the staff.

[0048] The degassing mechanism 8 can store air while performing vacuuming, and provide demoulding gas for the mold assembly 7, thereby improving the demoulding integrity and demoulding efficiency of the product.

[0049] See also Figure 5-9 The screening component 207 includes a rotating disk 2071 rotatably mounted inside the mixing tank 201, and a screening disk 2072 movably mounted inside the mixing tank 201 through a slide slot. Inclined wedges 2074 are equidistantly mounted on the top of the rotating disk 2071, and abutment rods 2073 are equidistantly mounted on the bottom of the screening disk 2072. The abutment rods 2073 vertically vibrate the screening disk 2072 through the inclined wedges 2074, so as to realize vertical vibration screening of the powder on the top of the screening disk 2072.

[0050] It should be noted that: the rotating disk 2071 rotates and moves inside the mixing tank 201 through the slip ring, and the screening disk 2072 cooperates with the slide rail on the inner wall of the mixing tank 201 through the slide groove to vibrate vertically. Under the rotation of the rotating disk 2071, the inclined wedge block 2074 and the resistance rod 2073 are intermittently connected to each other, and the screening disk 2072 is lifted up when the inclined wedge block 2074 and the resistance rod 2073 are in resistance contact, and the screening disk 2072 falls when the inclined wedge block 2074 and the resistance rod 2073 are separated, thereby causing the screening disk 2072 to vibrate vertically.

[0051] See also Fig.10The injection mechanism 3 includes an injection tube 301 fixedly mounted on one side of the mixing box 203, a second heater 302 is sleeved on the outer side of the injection tube 301, and a screw 303 is rotatably mounted inside the injection tube 301;

[0052] It should be noted that: the second heater 302 is powered on to generate heat which is transferred to the inside of the injection tube 301 to heat the raw materials inside the injection tube 301, thereby ensuring the fluidity of the molten raw materials for subsequent injection.

[0053] See also Figure 10-11 A valve disc 501 is rotatably mounted inside the mounting seat 5, and material passage holes 502 are equidistantly provided inside the valve disc 501;

[0054] It should be noted that: when the valve disc 501 drives the material passage hole 502 to dock with the discharge port of the injection tube 301, the movable mold 705 and the fixed mold 706 are docked until they are completely closed. When the material passage hole 502 is separated from the discharge port of the injection tube 301, the movable mold 705 moves away from the fixed mold 706. The single movement stroke of the movable mold 705 is half of the stroke of the material passage hole 502 rotating to dock with the discharge port of the injection tube 301. Therefore, when the movable mold 705 and the fixed mold 706 are docked again, the material passage hole 502 is docked with the discharge port of the injection tube 301.

[0055] See also Fig.11 The mold assembly 7 includes a slide bar 701 fixedly mounted on the inner wall of the mounting box 4, and a fixed mold 706 fixedly mounted on one side of the mounting seat 5, a demoulding air hole 707 is opened on one side of the fixed mold 706, a movable seat 702 is movably mounted on the outer side of the slide bar 701, a wire set 703 is embedded and mounted inside the movable seat 702, a reciprocating screw rod 704 is installed inside the wire set 703, and a movable mold 705 is fixedly mounted on one side of the movable seat 702;

[0056] It should be noted that the reciprocating screw rod 704 drives the movable seat 702 to move back and forth through the wire set 703, and the reciprocating movable seat 702 drives the movable mold 705 to move back and forth horizontally. When the movable mold 705 moves to dock with the fixed mold 706, the reciprocating screw rod 704 continues to rotate and drives the movable seat 702 to move in the opposite direction through the wire set 703. The movable seat 702 that moves in the opposite direction drives the movable mold 705 to move in the opposite direction away from the fixed mold 706, so as to facilitate demolding of the product. An exhaust channel is provided on the top of the movable mold 705 so that the gas generated during the product molding process can be discharged in time.

[0057] See also Figure 5-12The driving mechanism 6 includes a speed regulating motor 601 installed inside the protective box 102, and a first pulley group 602 is fixedly installed on the output end of the speed regulating motor 601. A bevel gear rod 603 extending to the inside of the mixing box 203 is fixedly installed on the top of one side of the first pulley group 602, and the top of one end of the bevel gear rod 603 is meshed and connected with the driven bevel gear 205 at the bottom of the transmission rod 204, and the bottom of one end of the bevel gear rod 603 is meshed and connected with the driven bevel gear 205 at the top of the stirring rod 208. One end of the bevel gear rod 603 is fixedly connected to one end of the screw 303 through a connecting rod, and a second pulley group 605 is installed at the bottom of one side of the first pulley group 602 through a linkage rod 604. The top of one side of the second pulley group 605 is fixedly connected to the reciprocating screw rod 704 through a connecting rod, and the bottom of one side of the second pulley group 605 is clamped with the valve disc 501 through a clamping rod;

[0058] It should be noted that: the speed regulating motor 601 is powered on and drives the bevel gear rod 603 and the linkage rod 604 to rotate synchronously through the first pulley group 602. The rotating bevel gear rod 603 drives the transmission rod 204 and the stirring rod 208 to rotate synchronously through the meshing driven bevel gear 205. At the same time, the rotating bevel gear rod 603 drives the screw 303 to rotate, and the rotating transmission rod 204 drives the stirring paddle 206 and the rotating disk 2071 to rotate. The rotating linkage rod 604 drives the valve disc 501 through the second pulley group 605 and drives the reciprocating screw rod 704 to rotate synchronously through the connecting rod.

[0059] See also Figure 13-14 The degassing mechanism 8 includes a high-pressure gas tank 801 fixedly installed on one side of the top of the workbench 1, a negative pressure pump 802 is installed at the bottom of the high-pressure gas tank 801 through a pipeline, and the suction end of the negative pressure pump 802 is connected to the mixing box 203 through a negative pressure pipe. A solenoid valve 804 is fixedly installed on the top of the high-pressure gas tank 801 through the high-pressure pipe 803, and the solenoid valve 804 is fixedly installed on one side of the fixed mold 706, and the solenoid valve 804 is connected to the demoulding air hole 707;

[0060] It should be noted that: the negative pressure pump 802 is powered on and running, and the negative pressure pump 802 draws the vacuum inside the mixing box 203 through the negative pressure pipe, and transports the sucked air to the high-pressure gas tank 801 for storage. The solenoid valve 804 is opened, and the high-pressure pipe 803 transports the high-pressure air inside the high-pressure gas tank 801 into the mold cavity, and the product in the mold cavity is gas-stripped and demolded.

[0061] See also Figure 1-4 A controller 101 is fixedly installed on the top of the workbench 1, a protective box 102 is fixedly installed on one side of the top of the workbench 1, and the speed regulating motor 601 and the negative pressure pump 802 are both fixedly installed inside the protective box 102;

[0062] It should be noted that the controller 101 is electrically connected to the speed regulating motor 601, the negative pressure pump 802, and the solenoid valve 804 through wires to facilitate the operation of the control device. The protective box 102 can protect the speed regulating motor 601 and the negative pressure pump 802 to prevent the speed regulating motor 601 and the negative pressure pump 802 from being damaged by external forces, rain and dust, thereby ensuring the safety of the speed regulating motor 601 and the negative pressure pump 802.

[0063] A powder metallurgy injection molding method, the injection molding method comprising the following steps:

[0064] Step 1: Open the lid of the mixing tank 201, put powder and binder into the mixing tank 201, and the powder and binder fall on the top of the screening disk 2072. The controller 101 controls the speed regulating motor 601 to be powered on. The speed regulating motor 601 is powered on to drive the bevel gear rod 603 and the linkage rod 604 to rotate synchronously through the first pulley group 602. The rotating bevel gear rod 603 drives the transmission rod 204 and the stirring rod 208 to rotate synchronously through the driven bevel gear 205 connected by meshing. At the same time, the rotating bevel gear rod 603 drives the screw 303 to rotate, and the rotating transmission rod 204 drives the stirring paddle 206 and the rotating disk 2 071 rotates, and the rotating rotating disk 2071 is intermittently connected to the abutment rod 2073 through the equally spaced inclined wedge blocks 2074. When the abutment rod 2073 intermittently passes through the inclined wedge blocks 2074, the screening disk 2072 is driven to vibrate vertically, so that the powder on the top of the screening disk 2072 is vibrated and screened, and the screened powder falls into the bottom of the mixing tank 201, and the raw materials in the mixing tank 201 are heated and melted by the first heater 202, and the raw materials are mixed by the rotating stirring paddle 206. The molten raw materials after mixing enter the interior of the mixing box 203, and are stirred, mixed and exhausted by the rotating stirring rod 208;

[0065] Step 2: When the molten raw materials are stirred and mixed, the controller 101 controls the negative pressure pump 802 to be powered on and run. The powered negative pressure pump 802 extracts the vacuum inside the mixing box 203 through the negative pressure pipe, and transports the sucked air to the high-pressure gas tank 801 for storage, so that the raw materials are vacuum-exhausted inside the mixing box 203 to avoid residual bubbles in the raw materials. After the bubble removal treatment, the rotating screw 303 pushes the raw materials to the discharge port of the injection tube 301 for subsequent injection. At the same time, the raw materials inside the injection tube 301 are further heated by the running second heater 302 to ensure the fluidity of the molten raw materials.

[0066] Step three: when the raw material is pushed to the discharge port of the injection tube 301 for injection, the rotating linkage rod 604 drives the valve disc 501 through the second pulley set 605 and drives the reciprocating screw rod 704 to rotate synchronously through the connecting rod, and the rotating reciprocating screw rod 704 drives the movable seat 702 to move outside the slide rod 701 through the wire set 703, and the movable movable seat 702 drives the movable mold 705 to move to the fixed mold 706 to dock and close to form a mold cavity, at this time, the rotating valve disc 501 drives the through hole 502 to dock with the fixed mold 706 and the discharge port of the injection tube 301, and the raw material inside the injection tube 301 is injected into the mold cavity through the through hole 502, and when the injection is completed, the rotating valve disc 501 drives the through hole 502 to continue to rotate away from the injection tube 301, so as to block the raw material at the discharge port of the injection tube 301, so that a closed space is formed inside the injection tube 301 and inside the mixing box 203, which is convenient for vacuuming;

[0067] Step 4: The raw material is cooled in the mold cavity to form a product. When the product is demolded, the controller 101 controls the solenoid valve 804 to open, so that the demolding hole 707 and the high-pressure pipe 803 form a passage. The high-pressure pipe 803 transports the high-pressure air inside the high-pressure gas tank 801 to the mold cavity to gas-peel off the product in the mold cavity. The controller 101 then controls the speed regulating motor 601 to energize and operate, so that the reciprocating screw rod 704 continues to rotate through the wire set 703 to drive the moving seat 702 to move in the opposite direction. The moving seat 702 that moves in the opposite direction drives the moving mold 705 away from the fixed mold 706 to realize automatic demolding of the product. After demolding is completed, the above steps are repeated to inject the next product, which is convenient for continuous injection molding processing of the device.

[0068] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A powder metallurgy injection molding device, comprising a workbench (1), characterized in that: A mounting box (4) is fixedly mounted on one side of the top of the workbench (1); a mounting seat (5) is embedded and mounted on one side of the mounting box (4); a mold assembly (7) is fixedly mounted on one side of the mounting seat (5); and the mold assembly (7) is placed inside the mounting box (4); A mixing mechanism (2) is fixedly installed on the other side of the top of the workbench (1), and the mixing mechanism (2) comprises a mixing tank (201) fixedly installed on the top of the workbench (1), a mixing box (203) fixedly installed on the bottom of the mixing tank (201), a stirring rod (208) rotatably installed at the bottom of the mixing box (203), a driven bevel gear (205) installed on the top of the stirring rod (208) via a connecting rod, a screening assembly (207) movably installed inside the mixing tank (201), a transmission rod (204) extending to the inside of the mixing box (203) fixedly installed at the bottom of the screening assembly (207), a stirring paddle (206) sleeved on the outer side of the transmission rod (204), and a driven bevel gear (205) fixedly installed at the bottom end of the transmission rod (204); An injection mechanism (3) is installed through one side of the mixing box (203), and one end of the injection mechanism (3) is connected to the mounting seat (5). A degassing mechanism (8) is fixedly installed on the top of the workbench (1) near the mixing mechanism (2). A driving mechanism (6) is installed on the other side of the mixing box (203) through a protective cover. The driving mechanism (6) is respectively connected to the mixing mechanism (2), the injection mechanism (3), the mounting seat (5), and the mold assembly (7).

2. A powder metallurgy injection molding device according to claim 1, characterized in that: The screening component (207) comprises a rotating disk (2071) rotatably mounted inside the mixing tank (201), and a screening disk (2072) movably mounted inside the mixing tank (201) via a slide slot, the top of the rotating disk (2071) is equidistantly mounted with inclined wedges (2074), the bottom of the screening disk (2072) is equidistantly mounted with abutment rods (2073), when the abutment rods (2073) pass through the inclined wedges (2074), the screening disk (2072) is vertically vibrated, thereby realizing vertical vibration screening of the powder on the top of the screening disk (2072).

3. A powder metallurgy injection molding device according to claim 1, characterized in that: The injection mechanism (3) comprises an injection tube (301) fixedly mounted on one side of the mixing box (203), a second heater (302) is sleeved on the outer side of the injection tube (301), and a screw (303) is rotatably mounted inside the injection tube (301).

4. A powder metallurgy injection molding device according to claim 1, characterized in that: A valve disc (501) is rotatably mounted inside the mounting seat (5), and material passage holes (502) are equidistantly provided inside the valve disc (501).

5. A powder metallurgy injection molding device and method according to claim 4, characterized in that: The mold assembly (7) includes a slide bar (701) fixedly mounted on the inner wall of the mounting box (4), and a fixed mold (706) fixedly mounted on one side of the mounting seat (5); a demoulding air hole (707) is provided on one side of the fixed mold (706); a movable seat (702) is movably mounted on the outer side of the slide bar (701); a wire set (703) is embedded and mounted inside the movable seat (702); a reciprocating screw rod (704) is installed through the inside of the wire set (703); and a movable mold (705) is fixedly mounted on one side of the movable seat (702).

6. A powder metallurgy injection molding device according to claim 5, characterized in that: The driving mechanism (6) comprises a speed regulating motor (601) installed inside the protection box (102), a first belt pulley set (602) is fixedly installed on the output end of the speed regulating motor (601), a bevel gear rod (603) extending into the mixing box (203) is fixedly installed on the top of one side of the first belt pulley set (602), and the top of one end of the bevel gear rod (603) is meshedly connected with the driven bevel gear (205) at the bottom of the transmission rod (204), and the bottom of one end of the bevel gear rod (603) is meshedly connected with the driven bevel gear (205) at the bottom of the transmission rod (204). The driven bevel gear (205) at the top of the mixing rod (208) is meshed and connected, one end of the bevel gear rod (603) is fixedly connected to one end of the screw rod (303) through a connecting rod, the bottom of one side of the first pulley group (602) is installed with the second pulley group (605) through a linkage rod (604), the top of one side of the second pulley group (605) is fixedly connected to the reciprocating screw rod (704) through a connecting rod, and the bottom of one side of the second pulley group (605) is clamped to the valve disc (501) through a clamping rod.

7. A powder metallurgy injection molding device according to claim 5, characterized in that: The degassing mechanism (8) comprises a high-pressure gas tank (801) fixedly mounted on one side of the top of the workbench (1); a negative pressure pump (802) is mounted on the bottom of the high-pressure gas tank (801) via a pipeline; a suction end of the negative pressure pump (802) is connected to a mixing box (203) via a negative pressure pipe; a solenoid valve (804) is fixedly mounted on the top of the high-pressure gas tank (801) via a high-pressure pipe (803); the solenoid valve (804) is fixedly mounted on one side of a fixed mold (706), and the solenoid valve (804) is connected to a demoulding air hole (707).

8. A powder metallurgy injection molding device according to claim 7, characterized in that: A controller (101) is fixedly installed on the top of the workbench (1), a protection box (102) is fixedly installed on one side of the top of the workbench (1), and a speed regulating motor (601) and a negative pressure pump (802) are both fixedly installed inside the protection box (102).

9. A powder metallurgy injection molding method, comprising a powder metallurgy injection molding device as claimed in any one of claims 1 to 8, characterized in that: The injection molding method includes the following steps: Step 1: The driving mechanism (6) drives the mixing mechanism (2), the injection mechanism (3), the mounting seat (5), and the mold assembly (7) to operate synchronously, and the powder is put into the mixing tank (201). The powder is screened by the operating screening assembly (207) and then falls into the bottom of the mixing tank (201). The raw materials in the mixing tank (201) are heated and melted by the first heater (202), and the raw materials are mixed by the rotating stirring paddle (206). The mixed molten raw materials enter the interior of the mixing box (203), and are stirred, mixed, and exhausted by the rotating stirring rod (208); Step 2: When the molten raw materials are stirred and mixed, the negative pressure pump (802) extracts the vacuum inside the mixing box (203) through the negative pressure pipe, and transports the sucked air to the high-pressure gas tank (801) for storage, thereby performing a degassing treatment on the molten raw materials. After the degassing treatment, the molten raw materials are injected under the push of the rotating screw (303), and the raw materials inside the injection tube (301) are further heated by the running second heater (302), thereby ensuring the fluidity of the molten raw materials; Step 3: When the raw material is pushed to the discharge port of the injection tube (301) for injection, the movable mold (705) and the fixed mold (706) are docked and closed to form a mold cavity. At this time, the rotating valve disc (501) drives the material through hole (502) to dock with the fixed mold (706) and the discharge port of the injection tube (301), and the raw material inside the injection tube (301) is injected into the mold cavity through the material through hole (502). When the injection of the raw material is completed, the controller (101) controls the speed regulating motor (601) to stop running; Step 4: The raw material is cooled in the mold cavity to form a product. When the product is demoulded, the solenoid valve (804) is opened, and the high-pressure gas stored in the high-pressure gas tank (801) is transported to the solenoid valve (804) through the high-pressure pipe (803). The solenoid valve (804) delivers high pressure gas to the mold cavity through the demoulding hole (707). The gas stripping of the product in the mold cavity, when the movable mold (705) is separated from the fixed mold (706), The product is automatically demoulded.

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