Metal powder injection molding mold comprising rotary demolding structure

Abstract

The invention relates to the technical field of injection molding, and discloses a metal powder injection molding mold comprising a rotary demolding structure, the metal powder injection molding mold comprises a bearing part, the bearing part comprises two symmetrically-arranged bearing frames, two sets of supporting legs and two arc-shaped swing plates, the bearing part comprises a bearing mold body, and the mold body comprises an upper mold base, a lower mold base and a mold base; the upper die base is fixedly installed between the tops of the two bearing frames, and the die base is fixedly installed at the bottom of the lower die base. The metal powder injection molding mold comprising the rotary demolding structure can effectively solve the problems that in the prior art, in the demolding process, a manipulator or a manual mode is generally adopted for demolding, the automation degree is low, a small part of injection molds adopt rotary demolding, and in the rotary demolding reciprocating process, the injection molds cannot be precisely reset to the initial state, and the demolding efficiency is high. The problems that in the mold closing process of a movable mold and a fixed mold, the mold closing precision is insufficient, the sizes of products produced every time are different, and the product quality is affected are solved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, and in particular to a metal powder injection molding mold comprising a rotary demoulding structure. Background Art

[0002] Metal powder injection molding is to mix metal powder and organic binder evenly under certain temperature conditions, and then inject the granulated metal powder into the mold cavity by an injection molding machine under heated plastic state to obtain a shaped blank, and then degrease it by chemical or solvent extraction method, and finally obtain the final product by sintering and densification.

[0003] In the prior art, the fixed mold of a general injection mold adopts a fixed design. When demolding, a robot or manual method is generally used, and the degree of automation is low. A small number of injection molds also use rotary demolding. During the reciprocating process of rotary demolding, it is impossible to accurately reset to the initial state, resulting in insufficient mold clamping accuracy during the clamping process of the movable mold and the fixed mold, causing the size of the product produced each time to be different, affecting the product quality, and easily causing damage to the mold surface or increased local wear. Summary of the invention

[0004] Technical issues solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a metal powder injection molding mold including a rotary demolding structure, which can effectively solve the problem in the prior art that demolding is generally performed by a robot or manually, with a low degree of automation. A small number of injection molds also use rotary demolding. During the reciprocating process of rotary demolding, they cannot be accurately reset to the initial state, resulting in insufficient mold closing accuracy during the mold closing process between the movable mold and the fixed mold, causing the size of the product produced each time to be different, affecting the product quality.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a metal powder injection molding die with a rotary demolding structure, comprising:

[0008] A workbench, two electric telescopic rods are symmetrically fixedly installed at the bottom of the workbench, the output ends of the two electric telescopic rods are both upwardly penetrated through the workbench and fixedly installed with a support plate, a motor is fixedly installed on one side of the upper surface of the workbench, and a worm is fixedly installed at the output end of the motor;

[0009] The load-bearing part includes two symmetrically arranged load-bearing frames, two sets of supporting legs and two arc-shaped swinging plates. The load-bearing frames are fixedly mounted on the supporting legs, and the load-bearing frames are fixedly mounted on the top of the workbench through the supporting legs. A rotating shaft is rotatably mounted at the central axis of the load-bearing frames, and the two arc-shaped swinging plates are respectively fixedly mounted on a rotating shaft, and the two arc-shaped swinging plates are located between the two load-bearing frames;

[0010] The mold body includes an upper mold base, a lower mold base and a mold base. The upper mold base is fixedly installed between the tops of the two load-bearing frames, and the mold base is fixedly installed at the bottom of the lower mold base.

[0011] The lower die seat, die base and arc-shaped swing plate adopt an integral design. A mounting sleeve is fixedly installed in the middle of the two arc-shaped swing plates. A central shaft is fixedly installed in the middle of the lower die seat. The central shaft passes through the common center of gravity of the lower die seat and the die base, and the central shaft is rotatably installed between the two mounting sleeves.

[0012] Furthermore, a plurality of rollers for supporting and reducing friction are evenly mounted on the bottom of the inner side wall of the load-bearing frame, and a support plate is fixedly connected to the side of the two arc-shaped swinging plates away from each other, and the support plate slides on the plurality of rollers, and two conical holes are symmetrically provided on the arc-shaped swinging plates, and a plurality of tooth grooves are evenly provided on the edge of the arc-shaped swinging plates, and the tooth grooves are meshed with the worm, and an arc-shaped rack is fixedly mounted on the inner wall of the side of the two load-bearing frames close to each other;

[0013] A small gear is fixedly installed at both ends of the central shaft, and the small gear is respectively meshed with an arc-shaped rack on the same side.

[0014] Furthermore, two groups of cylindrical holes are symmetrically provided on the opposite side walls of the mold base, and a combination rod is slidably arranged inside the cylindrical hole. A conical surface is provided at the end of the combination rod away from the middle of the mold base, and the taper of the conical surface on the combination rod is the same as the taper of the conical hole. A cylindrical cavity is provided inside the combination rod, and a spring 1 and a circular plate are provided inside the cylindrical cavity. The circular plate is slidably arranged inside the cylindrical cavity, and a push rod is fixedly connected to one side of the circular plate, and the push rod is inserted into the spring 1. A connecting head is fixedly connected to the side wall of the combination rod on the side of the circular plate away from the spring 1, and a rotating plate is rotatably installed on the end of the connecting head away from the combination rod.

[0015] Furthermore, a square groove is provided in the middle of the lower surface of the mold base, a square block is slidably installed inside the square groove, two grooves are symmetrically provided on the upper surface of the square block, the end of the rotating plate away from the connecting head is rotatably installed in the middle of the groove, a circular hole is provided in the middle of the upper surface of the square block, a top column is slidably arranged inside the circular hole, and a spring 2 is arranged between the top inner wall of the top column and the bottom inner wall of the top column.

[0016] Furthermore, a replaceable lower mold is arranged inside the mold cavity of the lower mold base, and the lower mold and the lower mold base adopt a separate structure. Two groups of deep holes are symmetrically provided on the inner cavity edge of the lower mold base, and a threaded hole 1 with a diameter larger than the deep hole is provided at the opening of the deep hole. A positioning guide column is slidably arranged inside the deep hole, and a sliding rod is fixedly connected to the top of the positioning guide column. A pressure plate 1 is threadedly installed inside the threaded hole 1, and the top of the sliding rod passes through the pressure plate 1 and extends to the top of the pressure plate 1. Two groups of threaded holes 2 are symmetrically provided on the edge of the lower mold, and a pressure plate 2 is threadedly installed inside the threaded hole 2, and a screw is fixedly connected to the bottom of the pressure plate 2, and the screw thread is installed inside the screw hole at the top of the sliding rod.

[0017] Furthermore, one side wall of the lower mold base and one side wall of the lower mold are symmetrically provided with two sliding grooves, a section of the sliding groove located inside the lower mold base is the sliding part, and one side of the sliding groove located inside the lower mold is the limiting part, a group of limiting grooves are symmetrically provided on the side wall of the sliding part, a wedge block is slidably arranged inside the sliding part, a pair of limiting columns are symmetrically fixedly connected on the side wall of the wedge block, the limiting columns are slidably arranged inside the corresponding group of limiting grooves, a movable cavity is provided inside the wedge block, a counterweight steel ball is arranged inside the movable cavity, and a magnetic block is fixedly installed inside the side wall of the wedge block away from the limiting part.

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

[0019] When the mold is closed, the electric telescopic rod pushes the support plate to support the lower mold base and the mold base, which will push the conical surface of the combined rod to insert into the conical hole. The arc-shaped swing plate, the lower mold base and the mold base are combined into a whole. With the design of the conical surface and the conical hole of the combined rod, the lower mold base and the mold base can be corrected to avoid deviation between the lower mold base and the upper mold base due to the gap between the teeth, which affects the accuracy of injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a workbench according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a mold body according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of a mold body according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of an arc-shaped swing plate, a lower die seat and a base according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of a mold base according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the combined rod transmission according to an embodiment of the present invention;

[0028] Figure 8 This is an exploded schematic diagram of a lower die base and a lower die according to an embodiment of the present invention;

[0029] Fig. 9 This is a schematic diagram of the installation of a wedge block according to an embodiment of the present invention;

[0030] Fig.10 This is a schematic diagram of the installation of the square block according to an embodiment of the present invention.

[0031] The numbers in the figure represent: 1. workbench; 11. electric telescopic rod; 111. support plate; 12. motor; 121. worm; 2. load-bearing part; 21. load-bearing frame; 211. rotating shaft; 212. roller; 22. support leg; 23. arc-shaped swing plate; 231. mounting sleeve; 232. support plate; 233. tapered hole; 234. tooth groove; 24. arc-shaped rack; 3. mold body; 31. upper mold base; 32. lower mold base; 321. deep hole; 322. threaded hole 1; 323. positioning guide column; 324. slide rod; 325. pressure plate 1; 33. mold base; 331. cylindrical hole; 3311. combination rod; 331 2. Cylindrical cavity; 3313. Spring 1; 3314. Round plate; 3315. Push rod; 3316. Connector; 3317. Rotating plate; 332. Square groove; 3321. Square block; 3322. Groove; 3323. Round hole; 3324. Push column; 3325. Spring 2; 34. Center axis; 341. Pinion; 35. Lower mold; 351. Threaded hole 2; 352. Press plate 2; 353. Screw; 36. Slide; 361. Sliding part; 362. Limit part; 363. Limit groove; 37. Wedge block; 371. Limit column; 372. Movable cavity; 373. Counterweight steel ball; 374. Magnetic block. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0033] The present invention will be further described below in conjunction with the embodiments.

[0034] Example:

[0035] See also Figure 1 - Fig.10 The present invention provides a technical solution: a metal powder injection molding mold with a rotary demolding structure, comprising:

[0036] A workbench 1, two electric telescopic rods 11 are symmetrically fixedly installed at the bottom of the workbench 1, the output ends of the two electric telescopic rods 11 both penetrate upward through the workbench 1 and are fixedly installed with a support plate 111, a motor 12 is fixedly installed on one side of the upper surface of the workbench 1, and a worm 121 is fixedly installed at the output end of the motor 12;

[0037] The load-bearing part 2 includes two symmetrically arranged load-bearing frames 21, two groups of supporting legs 22 and two arc-shaped swinging plates 23. The load-bearing frames 21 are fixedly mounted on the supporting legs 22, and the load-bearing frames 21 are fixedly mounted on the top of the workbench 1 through the supporting legs 22. A rotating shaft 211 is rotatably mounted at the central axis of the load-bearing frames 21. The two arc-shaped swinging plates 23 are respectively fixedly mounted on a rotating shaft 211, and the two arc-shaped swinging plates 23 are located between the two load-bearing frames 21;

[0038] The mold body 3 includes an upper mold base 31, a lower mold base 32 and a mold base 33. The upper mold base 31 is fixedly installed between the tops of the two load-bearing frames 21, and the mold base 33 is fixedly installed at the bottom of the lower mold base 32;

[0039] The lower die base 32, the die base 33 and the arc-shaped swing plate 23 are designed as an integral whole. A mounting sleeve 231 is fixedly installed in the middle of the two arc-shaped swing plates 23. A central shaft 34 is fixedly installed in the middle of the lower die base 32. The central shaft 34 passes through the common center of gravity of the lower die base 32 and the die base 33. The central shaft 34 is rotatably installed between the two mounting sleeves 231.

[0040] A plurality of rollers 212 for supporting and reducing friction are evenly installed on the bottom of the inner side wall of the load-bearing frame 21, and a support plate 232 is fixedly connected to the side of the two arc-shaped swinging plates 23 that are away from each other. The support plate 232 slides on the plurality of rollers 212. Two conical holes 233 are symmetrically provided on the arc-shaped swinging plates 23. A plurality of tooth grooves 234 are evenly provided on the edge of the arc-shaped swinging plates 23. The tooth grooves 234 are meshed with the worm 121. An arc-shaped rack 24 is fixedly installed on the inner wall of the side of the two load-bearing frames 21 that are close to each other.

[0041] A pinion gear 341 is fixedly mounted on both ends of the central shaft 34 , and the pinion gear 341 is respectively meshed with an arc-shaped rack gear 24 on the same side.

[0042] Two groups of cylindrical holes 331 are symmetrically provided on the opposite side walls of the mold base 33, and a combination rod 3311 is slidably provided inside the cylindrical hole 331. A conical surface is provided at the end of the combination rod 3311 away from the middle of the mold base 33, and the taper of the conical surface on the combination rod 3311 is the same as the taper of the conical hole 233. A cylindrical cavity 3312 is provided inside the combination rod 3311, and a spring 3313 and a circular plate 3314 are provided inside the cylindrical cavity 3312. The circular plate 3314 is slidably provided inside the cylindrical cavity 3312, and a push rod 3315 is fixedly connected to one side of the circular plate 3314, and the push rod 3315 is inserted into the spring 1 3313. A connector 3316 is fixedly connected to the side wall of the combination rod 3311 on the side of the circular plate 3314 away from the spring 1 3313, and a rotating plate 3317 is rotatably installed on the end of the connector 3316 away from the combination rod 3311.

[0043] A square groove 332 is provided in the middle of the lower surface of the mold base 33, and a square block 3321 is slidably installed inside the square groove 332. Two grooves 3322 are symmetrically provided on the upper surface of the square block 3321. The end of the rotating plate 3317 away from the connecting head 3316 is rotatably installed in the middle of the groove 3322. A circular hole 3323 is provided in the middle of the upper surface of the square block 3321, and a top column 3324 is slidably provided inside the circular hole 3323. A spring 2 3325 is provided between the top inner wall of the top column 3324 and the bottom inner wall of the top column 3324.

[0044] A replaceable lower mold 35 is arranged inside the mold cavity of the lower mold base 32. The lower mold 35 and the lower mold base 32 adopt a separate structure. Two groups of deep holes 321 are symmetrically provided on the edge of the inner cavity of the lower mold base 32. A threaded hole 322 with a diameter larger than the deep hole 321 is provided at the opening of the deep hole 321. A positioning guide column 323 is slidably arranged inside the deep hole 321. The top of the positioning guide column 323 is fixedly connected with a slide rod 324. The inside of the threaded hole 322 is threadedly installed with a pressure plate 325. The top of the slide rod 324 passes through the pressure plate 325 and extends to the top of the pressure plate 325. Two groups of threaded holes 351 are symmetrically provided on the edge of the lower mold 35. The inside of the threaded hole 351 is threadedly installed with a pressure plate 352. The bottom of the pressure plate 352 is fixedly connected with a screw 353. The screw 353 is threadedly installed inside the screw hole at the top of the slide rod 324.

[0045] One side wall of the lower die base 32 and one side wall of the lower die 35 are symmetrically provided with two sliding grooves 36. A section of the sliding groove 36 located inside the lower die base 32 is a sliding portion 361, and one side of the sliding groove 36 located inside the lower die 35 is a limiting portion 362. A group of limiting grooves 363 are symmetrically provided on the side wall of the sliding portion 361. A wedge block 37 is slidably arranged inside the sliding portion 361. A pair of limiting columns 371 are symmetrically fixedly connected to the side wall of the wedge block 37. The limiting columns 371 are slidably arranged inside the corresponding group of limiting grooves 363. A movable cavity 372 is provided inside the wedge block 37. A counterweight steel ball 373 is arranged inside the movable cavity 372. A magnetic block 374 is fixedly installed inside the side wall of the wedge block 37 away from the limiting portion 362.

[0046] refer to Figure 1-Figure 10 In the prior art, the rotary demoulding method can shorten the demoulding time, improve production efficiency, and reduce the intensity of workers. However, since the principle of rotary demoulding is to control the fixed mold to rotate a certain angle around a central axis and use gravity to make the product fall off freely, the movable mold will be pressed tightly against the fixed mold when the mold is closed, which may cause the central axis to deform, thereby affecting the processing accuracy of the subsequent mold. In this regard, the present application designs a metal powder injection molding mold including a rotary demoulding structure;

[0047] In order to overcome the above-mentioned defects, the present application designs a metal powder injection molding mold including a rotary demolding structure, a load-bearing part 2, the load-bearing part 2 includes two symmetrically arranged load-bearing frames 21, two sets of supporting legs 22 and two arc-shaped swing plates 23, a mold body 3, and the mold body 3 includes an upper mold base 31, a lower mold base 32 and a mold base 33;

[0048] The lower die base 32, the die base 33 and the arc-shaped swing plate 23 are of integral design;

[0049] Initially, the lower mold base 32 is at the lowest position, and the electric telescopic rod 11 is controlled to extend, pushing the support plate 111 to approach the mold base 33, and pushing the cylindrical cavity 3312 to slide into the square groove 332. During the sliding process, the top column 3324 shrinks into the circular hole 3323, and the second spring 3325 is compressed;

[0050] When the square block 3321 slides into the square groove 332, the rotating plate 3317 is pushed to rotate, and the angle between the two rotating plates 3317 increases, pushing the circular plates 3314, the push rod 3315 and the connecting head 3316 on both sides away from each other. Through the setting of the spring 1 3313, initially, the circular plate 3314 will push the combination rod 3311 and the spring 1 3313 to move synchronously. When the conical surface of the combination rod 3311 is inserted into the conical hole 233, the circular plate 3314 will compress the spring 1 3313 until the push rod 3315 and the cylindrical cavity 3312 are close to the side of the conical surface. The inner wall fits, and the rotating plate 3317 is just in a horizontal state. The upper surface of the support plate 111 is just in full fit with the lower surfaces of the mold base 33 and the square block 3321 at the same time. At this time, the combination rod 3311 is inserted into the tapered hole 233, and the spring 1 3313 is supported by the ejector rod 3315 and will not shake inside the tapered hole 233. The arc swing plate 23, the lower mold seat 32 and the mold base 33 are combined into a whole. In the subsequent mold closing, when the upper mold is pressed tightly on the lower mold, the central shaft 34 and the combination rod 3311 bear the weight together to prevent the central shaft 34 from being deformed due to excessive mold closing pressure.

[0051] On the contrary, when the arc-shaped swing plate 23, the lower mold base 32 and the mold base 33 are combined into a whole, if the thrust of the electric telescopic rod 11 is large, the central shaft 34 and the combination rod 3311 can also be stressed together to avoid deformation of the central shaft 34;

[0052] Demolding process:

[0053] The electric telescopic rod 11 is in a retracted state, the combination rod 3311 is retracted inside the cylindrical hole 331, and the control motor 12 works. The worm 121 is meshed with the tooth groove 234, which can drive the arc-shaped swing plate 23 to rotate, and the mold body 3 moves synchronously. Since the pinion 341 is meshed with the arc-shaped rack 24, when the arc-shaped swing plate 23 swings, the pinion 341 drives the lower mold base 32 and the mold base 33 to rotate synchronously through the central shaft 34, so that the lower mold base 32 and the mold base 33 are turned over, so that the product can be automatically demoulded by using gravity.

[0054] When the lower die seat 32 is turned over and demoulded, the horizontal height of the wedge block 37 rises, and the wedge block 37 slides toward the inside of the limiting portion 362, thereby limiting the lower die 35 to prevent the lower die 35 from sliding inside the lower die seat 32;

[0055] In addition, by setting the weighted steel ball 373, when the lower mold base 32 rotates a certain angle, the suction force of the magnetic block 374 on the weighted steel ball 373 is smaller than the weight of the magnetic block 374, and the weighted steel ball 373 will fall to the side of the movable cavity 372 away from the magnetic block 374 and hit the inner wall of the movable cavity 372, thereby avoiding the situation where the wedge block 37 and the inner wall of the sliding portion 361 have large friction and the wedge block 37 cannot slide freely;

[0056] After demoulding is completed, the motor 12 reverses, driving the arc-shaped swing plate 23 to rotate, and the lower mold base 32 and the mold base 33 flip in the opposite direction. At this time, the wedge block 37 slides and shrinks into the sliding part 361 under the action of gravity. Then, when the lower mold base 32 flips more than 90 degrees, the lower mold 35 is pulled by gravity to move the positioning guide column 323 and the slide rod 324 synchronously until the positioning guide column 323 hits the pressure plate 325, generating vibration. The vibration generated by the vibration is used to facilitate cleaning of debris adhering to the inner cavity of the lower mold 35, avoiding the need for subsequent manual cleaning of the mold.

[0057] When the motor 12 is subsequently controlled to work, the mold body 3 can be rotated to the lowest position to facilitate the smooth progress of subsequent injection molding work.

[0058] As can be seen from the above, when the mold is closed, the electric telescopic rod 11 is extended, pushing the support plate 111 to approach the mold base 33, and pushing the cylindrical cavity 3312 to slide into the square groove 332. During the sliding process, the top column 3324 is retracted into the circular hole 3323, and the second spring 3325 is compressed;

[0059] When the square block 3321 slides into the square groove 332, the rotating plate 3317 is pushed to rotate, and the angle between the two rotating plates 3317 increases, pushing the circular plates 3314, the push rod 3315 and the connecting head 3316 on both sides away from each other. Through the setting of the spring 1 3313, initially, the circular plate 3314 will push the combination rod 3311 and the spring 1 3313 to move synchronously. When the conical surface of the combination rod 3311 is inserted into the conical hole 233, the circular plate 3314 will compress the spring 1 3313 until the push rod 3315 and the cylindrical cavity 3312 are close to the side of the conical surface. The inner wall fits together, and the rotating plate 3317 is just in a horizontal state. The upper surface of the support plate 111 is just in full fit with the lower surfaces of the mold base 33 and the square block 3321 at the same time. At this time, the combination rod 3311 is inserted into the tapered hole 233, and the spring 1 3313 is supported by the push rod 3315 and will not shake inside the tapered hole 233. The arc-shaped swing plate 23, the lower mold seat 32 and the mold base 33 are combined into a whole. In the subsequent mold closing, when the upper mold is pressed tightly on the lower mold, the center shaft 34 and the combination rod 3311 bear the weight together to prevent the center shaft 34 from being deformed due to excessive mold closing pressure.

[0060] In summary, this application has the following advantages:

[0061] Advantage 1: When the mold is closed, the electric telescopic rod 11 pushes the support plate 111 to support the lower mold base 32 and the mold base 33, and the conical surface of the combination rod 3311 is pushed into the conical hole 233. The arc-shaped swing plate 23, the lower mold base 32 and the mold base 33 are combined into a whole. In the subsequent mold closing, when the upper mold is pressed tightly on the lower mold, the center shaft 34 and the combination rod 3311 bear the weight together to prevent the center shaft 34 from being deformed due to excessive mold closing pressure.

[0062] Advantage 2: If the thrust of the electric telescopic rod 11 is large, the arc-shaped swing plate 23, the lower mold base 32 and the mold base 33 are combined into a whole, and the central shaft 34 and the combination rod 3311 can also be subjected to force together to avoid deformation of the central shaft 34.

[0063] Advantage three, during the demolding process, the horizontal height of the wedge block 37 rises, and the wedge block 37 will slide toward the inside of the limiting portion 362, thereby limiting the lower mold 35 to prevent the lower mold 35 from sliding inside the lower mold base 32. When the lower mold base 32 and the mold base 33 are flipped in the opposite direction, when the angle is greater than 90 degrees, the lower mold 35 will be pulled by gravity to pull the positioning guide column 323 and the slide rod 324 to move synchronously until the positioning guide column 323 hits the pressure plate 325 to generate vibration. The vibration generated by it is used to facilitate cleaning of debris adhering to the inner cavity of the lower mold 35, avoiding the need for subsequent manual cleaning of the mold. In addition, a vacuum cleaner or blower can be installed on the cleaning side to enhance the cleaning effect.

[0064] Advantage four, through the setting of the counterweight steel ball 373, when the lower mold base 32 rotates a certain angle, the suction force of the magnetic block 374 on the counterweight steel ball 373 is less than the weight of the magnetic block 374, and the counterweight steel ball 373 will fall to the side of the movable cavity 372 away from the magnetic block 374 and hit the inner wall of the movable cavity 372, thereby avoiding the situation where the wedge block 37 and the inner wall of the sliding part 361 have large friction and the wedge block 37 cannot slide freely.

[0065] Advantage five, when the tapered surface of the combination rod 3311 is inserted into the tapered hole 233, the circular plate 3314 continues to move and will compress the spring 1 3313 until the push rod 3315 fits against the inner wall of the cylindrical cavity 3312 close to the tapered surface. With the design of the tapered surface of the combination rod 3311 and the tapered hole 233, the lower mold base 32 and the mold base 33 can be corrected to avoid deviation between the lower mold base 32 and the upper mold base 31 due to the gap between the teeth, which affects the accuracy of injection molding.

[0066] Advantage six, through the setting of the circular hole 3323, the top column 3324 and the second spring 3325, after the support plate 111 is moved upward to control the arc swing plate 23, the lower mold base 32 and the mold base 33 to be combined into a whole, it is convenient to use the elasticity of the second spring 3325 to reset the combination rod 3311, and use the elasticity of the second spring 3325 to prevent the square block 3321 from sliding inside the square groove 332 when the lower mold base 32 and the mold base 33 are flipped, resulting in a change in the center of gravity of the lower mold base 32 and the mold base 33, causing uneven force on the central axis 34.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A metal powder injection molding mold comprising a rotary demolding structure, characterized in that: include: A workbench (1), wherein two electric telescopic rods (11) are symmetrically fixedly mounted on the bottom of the workbench (1), the output ends of the two electric telescopic rods (11) both pass through the workbench (1) upwards and are fixedly mounted with a support plate (111), a motor (12) is fixedly mounted on one side of the upper surface of the workbench (1), and a worm (121) is fixedly mounted on the output end of the motor (12); A load-bearing part (2), the load-bearing part (2) comprising two symmetrically arranged load-bearing frames (21), two groups of supporting legs (22) and two arc-shaped swinging plates (23), the load-bearing frames (21) being fixedly mounted on the supporting legs (22), and the load-bearing frames (21) being fixedly mounted on the top of the workbench (1) through the supporting legs (22), a rotating shaft (211) being rotatably mounted at the central axis of the load-bearing frames (21), the two arc-shaped swinging plates (23) being respectively fixedly mounted on a rotating shaft (211), and the two arc-shaped swinging plates (23) being located between the two load-bearing frames (21); A mold body (3), the mold body (3) comprising an upper mold base (31), a lower mold base (32) and a mold base (33), the upper mold base (31) being fixedly mounted between the tops of the two load-bearing frames (21), and the mold base (33) being fixedly mounted at the bottom of the lower mold base (32); The lower die base (32), the die base (33) and the arc-shaped swing plate (23) are of integral design. A mounting sleeve (231) is fixedly mounted in the middle of each of the two arc-shaped swing plates (23). A central shaft (34) is fixedly mounted in the middle of the lower die base (32). The central shaft (34) passes through the common center of gravity of the lower die base (32) and the die base (33). The central shaft (34) is rotatably mounted between the two mounting sleeves (231).

2. A metal powder injection molding mold comprising a rotary demolding structure according to claim 1, characterized in that: A plurality of rollers (212) for supporting and reducing friction are evenly and rotatably mounted on the bottom of the inner side wall of the load-bearing frame (21); a support plate (232) is fixedly connected to the side away from each other of the two arc-shaped swing plates (23); the support plate (232) slides on the plurality of rollers (212); two conical holes (233) are symmetrically provided on the arc-shaped swing plate (23); a plurality of tooth grooves (234) are evenly provided on the edge of the arc-shaped swing plate (23); the tooth grooves (234) are meshed with the worm (121); an arc-shaped rack (24) is fixedly mounted on the inner wall of the side close to each other of the two load-bearing frames (21); A pinion gear (341) is fixedly mounted on both ends of the central shaft (34), and the pinion gear (341) is respectively meshed with an arc-shaped rack gear (24) on the same side.

3. The metal powder injection molding mold comprising a rotary demolding structure according to claim 1, characterized in that: Two groups of cylindrical holes (331) are symmetrically provided on the opposite side walls of the mold base (33), and a combination rod (3311) is slidably provided inside each of the cylindrical holes (331). A conical surface is provided at one end of the combination rod (3311) away from the middle of the mold base (33), and the taper of the conical surface on the combination rod (3311) is the same as the taper of the conical hole (233). A cylindrical cavity (3312) is provided inside the combination rod (3311), and a spring (3311) is provided inside the cylindrical cavity (3312). 3) and a circular plate (3314), the circular plate (3314) is slidably arranged inside the cylindrical cavity (3312), one side of the circular plate (3314) is fixedly connected with a push rod (3315), the push rod (3315) is inserted into the spring one (3313), the side of the circular plate (3314) away from the spring one (3313) passes through the side wall of the combination rod (3311) and is fixedly connected with a connector (3316), and the end of the connector (3316) away from the combination rod (3311) is rotatably mounted with a rotating plate (3317).

4. The metal powder injection molding mold comprising a rotary demolding structure according to claim 3, characterized in that: A square groove (332) is provided in the middle of the lower surface of the mold base (33), a square block (3321) is slidably installed inside the square groove (332), two grooves (3322) are symmetrically provided on the upper surface of the square block (3321), one end of the rotating plate (3317) away from the connecting head (3316) is rotatably installed in the middle of the groove (3322), a circular hole (3323) is provided in the middle of the upper surface of the square block (3321), a top column (3324) is slidably provided inside the circular hole (3323), and a spring 2 (3325) is provided between the top inner wall of the top column (3324) and the bottom inner wall of the top column (3324).

5. The metal powder injection molding mold with a rotary demolding structure according to claim 1, characterized in that: A replaceable lower mold (35) is arranged inside the mold cavity of the lower mold base (32), and the lower mold (35) and the lower mold base (32) adopt a separate structure. Two groups of deep holes (321) are symmetrically opened on the edge of the inner cavity of the lower mold base (32), and a threaded hole (322) with a diameter larger than the deep hole (321) is opened at the opening of the deep hole (321). A positioning guide column (323) is slidably arranged inside the deep hole (321), and a sliding rod (324) is fixedly connected to the top of the positioning guide column (323). The interior of the threaded hole 1 (322) is threadedly installed with a pressure plate 1 (325), the top of the sliding rod (324) passes through the pressure plate 1 (325) and extends to the top of the pressure plate 1 (325), the edge of the lower mold (35) is symmetrically provided with two groups of threaded holes 2 (351), the interior of the threaded hole 2 (351) is threadedly installed with a pressure plate 2 (352), the bottom of the pressure plate 2 (352) is fixedly connected with a screw (353), and the screw (353) is threadedly installed inside the screw hole at the top of the sliding rod (324).

6. The metal powder injection molding mold with a rotary demolding structure according to claim 1, characterized in that: The side wall of one side of the lower die seat (32) and the side wall of one side of the lower die (35) are symmetrically provided with two slide grooves (36); a section of the slide groove (36) located inside the lower die seat (32) is a sliding portion (361); a side of the slide groove (36) located inside the lower die (35) is a limiting portion (362); a group of limiting grooves (363) are symmetrically provided on the side wall of the sliding portion (361); a wedge-shaped block is slidably provided inside the sliding portion (361) (37), a pair of limiting columns (371) are symmetrically fixedly connected to the side wall of the wedge block (37), and the limiting columns (371) are slidably arranged inside a corresponding set of limiting grooves (363). A movable cavity (372) is opened inside the wedge block (37), and a counterweight steel ball (373) is arranged inside the movable cavity (372). A magnetic block (374) is fixedly installed inside the side wall of the wedge block (37) away from the limiting portion (362).

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