MIM injection molding device and method for high-strength and high-toughness metal parts

Abstract

The invention relates to the technical field of metal powder injection molding, in particular to a high-strength and high-toughness metal part MIM injection molding device and method.The high-strength and high-toughness metal part MIM injection molding device comprises a base, a top frame fixedly connected to the base, an injection cylinder arranged on the lower side of the top frame, an upper mold base rotationally connected to the bottom end of the injection cylinder, and a lower mold base rotationally connected to the base; a transmission mechanism is fixedly connected to the base, an annular frame is arranged on the base in a sliding fit mode, a plurality of adjusting mechanisms are rotatably connected to the annular frame, a knocking rod is arranged on the annular frame in a sliding fit mode, and a reciprocating lead screw is rotatably connected to the inner wall of the bottom end of the top frame. The powder can be distributed more uniformly in the mold, the condition of non-uniform compactness or incomplete filling is avoided, the powder flows more uniformly in the injection process, and therefore it is ensured that the whole mold cavity is filled, and the defects caused by non-uniform powder accumulation are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metal powder injection molding, and in particular to a MIM injection molding device and method for high-strength and high-toughness metal parts. Background Art

[0002] High-strength and high-toughness metal parts refer to metal materials or components that have both high strength and high toughness. Such parts are usually used in applications that require high performance, durability and reliability, such as aerospace, automotive, military, energy and other industries. They can withstand large loads, impacts and extreme environmental conditions and maintain excellent mechanical properties.

[0003] MIM (Metal Injection Molding) technology for high-strength and high-toughness metal parts is a part manufacturing technology that mixes metal powder with a polymer binder to form a process similar to plastic injection molding. MIM injection molding equipment for high-strength and high-toughness metal parts can produce a variety of parts, especially for small, complex shapes, high precision requirements, high strength and high toughness requirements. It is widely used in many fields such as automobiles, aviation, medical, electronics, etc., and has the advantages of high efficiency, energy saving and cost control.

[0004] When performing injection molding of rotor parts, the existing MIM injection molding device directly injects a mixture of metal powder and binder into the mold. Since the mold structure is fixed, and the metal powder and binder mixture in the MIM process often has high viscosity and poor fluidity, the distribution of the material in the mold cavity may be uneven, which can easily lead to problems such as uneven density and shape defects (such as pores, thin walls, and skewness) in the molded rotor parts, affecting the quality and strength of the rotor parts.

[0005] In summary, the prior art lacks the technology of using mold shaking and vibration for the mold in the MIM injection molding device. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a MIM injection molding device and method for high-strength and high-toughness metal parts.

[0007] In order to achieve the above objectives, the technical solution adopted by the present invention is: a MIM injection molding device for high-strength and high-toughness metal parts, including a base, a top frame is fixedly connected to the base, an injection cylinder is arranged on the lower side of the top frame, an upper mold seat is rotatably connected to the bottom end of the injection cylinder, a lower mold seat is rotatably connected to the base, a transmission mechanism is fixedly connected to the base, an annular frame is slidably provided on the base, a plurality of adjustment mechanisms are rotatably provided on the annular frame, a knocking rod is slidably provided on the annular frame, and a reciprocating screw is rotatably connected to the inner wall of the bottom end of the top frame.

[0008] Preferably, a movable frame is rotatably connected to the upper die seat, hydraulic rods are fixedly installed at both ends of the movable frame, the other end of the hydraulic rod is fixedly connected to the top frame, and contact rings are fixedly connected to the outer sides of the upper die seat and the lower die seat.

[0009] Preferably, the transmission mechanism comprises a motor, the motor is connected and fixedly arranged with the base, a rotating shaft is connected and fixedly arranged with the output end of the motor, a driving wheel is connected and fixedly arranged with one end of the rotating shaft, and a cylindrical cam is connected and fixedly arranged with the other end of the rotating shaft.

[0010] Preferably, a guide rod is provided on the cylindrical cam for sliding cooperation, a rack is fixedly connected to one end of the guide rod, a slider is fixedly connected to the lower surface of the rack, the slider is slidingly cooperated with the base, a rotating column is fixedly connected to the bottom end of the lower mold base, the rotating column is rotatably connected to the base, a gear is fixedly connected to the rotating column, the gear is meshed with the rack for transmission, and a transmission wheel is fixedly connected to one end of the cylindrical cam.

[0011] Preferably, a rotating frame is slidingly provided on the lower side of the annular frame, a toothed disc is fixedly connected to the lower side of the rotating frame, the toothed disc is meshed with a transmission wheel for transmission, the toothed disc is rotatably connected to the base, and a limiting groove is provided on the outer side of the annular frame.

[0012] Preferably, the adjustment mechanism includes a transmission rod, which is slidingly matched with the annular frame, and the bottom end of the transmission rod is rotatably connected to the rotating frame. An adjusting wheel is fixedly connected to the bottom end of the transmission rod, and the adjusting wheel is meshingly transmitted with an annular rack connected to the base. A worm sleeve is slidingly matched on the transmission rod, and the worm sleeve is rotatably connected to the annular frame. A worm wheel is meshingly transmitted on one side of the worm sleeve, and the worm wheel is rotatably connected to the annular frame. Both ends of the worm wheel are fixedly connected to L-shaped rods.

[0013] Preferably, one end of the knocking rod is movably contacted with the contact ring, the bottom end of the knocking rod is connected and fixedly provided with a sliding frame, and the other end of the sliding frame is slidably matched with the annular frame.

[0014] Preferably, a driven wheel is fixedly connected to the bottom end of the reciprocating screw rod, and the driven wheel is meshed with the driving wheel for transmission. A moving seat is slidingly provided on the outer wall of the reciprocating screw rod, and both ends of the moving seat are slidingly provided on the inner wall of the top frame. A limiting block is fixedly connected to one side of the moving seat, and the limiting block is slidingly provided on the inner wall of the limiting groove.

[0015] A method for using a MIM injection molding device for high-strength and high-toughness metal parts comprises the following steps: S1. When the rotor parts need to be injection molded, the upper mold base and the lower mold base are first molded together, and then the metal powder mixture is injected into the upper mold base and the lower mold base through the injection cylinder; S2. During injection, the transmission mechanism can drive the upper die base and the lower die base to swing back and forth, so that the metal powder mixture inside is evenly filled; S3. At the same time, the transmission mechanism drives the annular frame to rotate, so that the knocking rod rotates. Driven by the adjustment mechanism, the knocking rod continuously knocks, causing the upper die seat and the lower die seat to vibrate, thereby improving the molding quality. S4. At the same time, the transmission mechanism will drive the reciprocating screw rod to move the annular frame up and down, thereby increasing the striking range of the striking rod.

[0016] Compared with the prior art, the present invention has the following beneficial effects: While the injection barrel injects the metal powder mixture into the upper die base and the lower die base, the transmission mechanism can drive the upper die base and the lower die base to swing back and forth, so that the powder can be more evenly distributed inside the mold, avoiding uneven density or incomplete filling, and making the powder flow more evenly during the injection process, thereby ensuring that the entire mold cavity is filled and reducing defects caused by uneven powder accumulation; While the upper die seat and the lower die seat are swinging back and forth, the transmission structure will drive the annular frame to rotate, so that the knocking rod can rotate around the upper die seat and the lower die seat. At the same time, driven by the adjustment mechanism, the knocking rod can continuously knock on the outer sides of the upper die seat and the lower die seat to generate vibration, which can effectively reduce the friction of the metal powder mixture, enhance its fluidity, and enable the powder to fill the mold cavity more quickly and evenly, so that the arrangement between the powder particles will be more compact, the density will be improved, and the defects that may occur in the molding process can be avoided. It can also help remove the gaps that may be generated between the powders and reduce the formation of bubbles; By setting a reciprocating screw, the ring frame can be driven to move up and down under the drive of the transmission mechanism, which can effectively expand the knocking range of the knocking rod, thereby improving the filling effect of the metal powder mixture. The combination of vibration and knocking can not only ensure the uniform distribution of metal powder in the mold, but also effectively reduce bubbles and pores, and improve the density and strength of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of a MIM injection molding device and method for high-strength and high-toughness metal parts of the present invention; Figure 2 It is a schematic diagram of the upper mold base structure of a MIM injection molding device and method for high-strength and high-toughness metal parts of the present invention; Figure 3 It is a schematic diagram of the transmission mechanism structure of a MIM injection molding device and method for high-strength and high-toughness metal parts of the present invention; Figure 4 It is a schematic diagram of the structure of the lower mold base of a MIM injection molding device and method for high-strength and high-toughness metal parts of the present invention; Figure 5 A schematic diagram of the base structure of a MIM injection molding device and method for high-strength and high-toughness metal parts of the present invention; Figure 6 A schematic diagram of the rotating frame structure of a MIM injection molding device and method for high-strength and high-toughness metal parts of the present invention; Figure 7 It is a schematic diagram of the structure of the adjustment mechanism and the knocking rod of the MIM injection molding device and method of the high-strength and high-toughness metal parts of the present invention; Figure 8 The present invention is a schematic diagram of a reciprocating screw structure of a MIM injection molding device and method for high-strength and high-toughness metal parts.

[0018] The following are marked in the figure: 1, base; 2, top frame; 3, injection cylinder; 4, upper die seat; 5, lower die seat; 6, transmission mechanism; 7, ring frame; 8, adjustment mechanism; 9, knocking rod; 10, reciprocating screw rod; 401, moving frame; 402, hydraulic rod; 403, contact ring; 601, motor; 602, rotating shaft; 603, driving wheel; 604, cylindrical cam; 605, guide rod; 606, rack ; 607, transmission wheel; 608, slider; 501, rotating column; 502, gear; 701, rotating frame; 702, toothed disc; 703, limiting groove; 801, transmission rod; 802, adjusting wheel; 803, worm sleeve; 804, worm wheel; 805, L-shaped rod; 901, sliding frame; 1001, driven wheel; 1002, moving seat; 1003, limiting block; 101, annular rack. DETAILED DESCRIPTION

[0019] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0020] like Figure 1-Figure 8 The MIM injection molding device and method of a high-strength and high-toughness metal part shown in the figure include a base 1, a top frame 2 is fixedly connected to the base 1, an injection cylinder 3 is arranged on the lower side of the top frame 2, an upper mold base 4 is rotatably connected to the bottom end of the injection cylinder 3, a lower mold base 5 is rotatably connected to the base 1, a transmission mechanism 6 is fixedly connected to the base 1, an annular frame 7 is slidably provided on the base 1, a plurality of adjustment mechanisms 8 are rotatably provided on the annular frame 7, a knocking rod 9 is slidably provided on the annular frame 7, and a reciprocating screw 10 is rotatably connected to the inner wall of the bottom end of the top frame 2.

[0021] like Figure 2 As shown, a moving frame 401 is rotatably connected to the upper die base 4, and hydraulic rods 402 are fixedly installed at both ends of the moving frame 401. The other end of the hydraulic rod 402 is fixedly connected to the top frame 2, and contact rings 403 are fixedly connected to the outer sides of the upper die base 4 and the lower die base 5. The upper die base 4 and the lower die base 5 are molded by the hydraulic rod 402, and then the metal powder mixture is injected into the upper die base 4 and the lower die base 5 through the injection cylinder 3.

[0022] like Figure 3 , Figure 4 As shown, the transmission mechanism 6 includes a motor 601, which is fixedly connected to the base 1, and a rotating shaft 602 is fixedly connected to the output end of the motor 601, a driving wheel 603 is fixedly connected to one end of the rotating shaft 602, and a cylindrical cam 604 is fixedly connected to the other end of the rotating shaft 602. The rotating shaft 602 is driven to rotate by the motor 601, so that the rotating shaft 602 drives the connected cylindrical cam 604 to rotate.

[0023] A guide rod 605 is provided on the cylindrical cam 604 in a sliding manner, a rack 606 is connected and fixedly provided at one end of the guide rod 605, a slider 608 is connected and fixedly provided on the lower surface of the rack 606, the slider 608 is provided in a sliding manner with the base 1, a rotating column 501 is connected and fixedly provided at the bottom end of the lower die seat 5, the rotating column 501 is provided in a rotational connection with the base 1, a gear 502 is connected and fixedly provided on the rotating column 501, the gear 502 is provided in a meshing transmission arrangement with the rack 606, and a transmission wheel 607 is connected and fixedly provided at one end of the cylindrical cam 604. The annular bevel groove outside the cylindrical cam 604 drives the rack 606 connected to the guide rod 605 to move back and forth, thereby driving the gear 502 to swing back and forth, so that the gear 502 drives the lower die seat 5 connected to the rotating column 501 to swing back and forth.

[0024] like Figure 5 , Figure 6As shown, a rotating frame 701 is slidably provided on the lower side of the annular frame 7, a toothed disc 702 is connected and fixedly provided on the lower side of the rotating frame 701, the toothed disc 702 is meshed and transmitted with the transmission wheel 607, the toothed disc 702 is rotatably connected with the base 1, and a limiting groove 703 is provided on the outer side of the annular frame 7. The rotation of the rotating shaft 602 drives the connected transmission wheel 607 to rotate, so that the transmission wheel 607 drives the toothed disc 702 to rotate, so that the toothed disc 702 drives the connected rotating frame 701 to rotate, so that the rotating frame 701 rotates.

[0025] like Figure 7 As shown, the adjustment mechanism 8 includes a transmission rod 801, which is slidably matched with the annular frame 7, and the bottom end of the transmission rod 801 is rotatably connected to the rotating frame 701. An adjusting wheel 802 is fixedly connected to the bottom end of the transmission rod 801, and the adjusting wheel 802 is meshingly transmitted with the annular rack 101 connected to the base 1. A worm sleeve 803 is slidably matched on the transmission rod 801, and the worm sleeve 803 is rotatably connected to the annular frame 7. A worm wheel 804 is meshingly transmitted on one side of the worm sleeve 803, and the worm wheel 804 is rotatably connected to the annular frame 7. Both ends of the worm wheel 804 are fixedly connected to L-shaped rods 805.

[0026] like Figure 7 As shown, one end of the knock rod 9 is movably contacted with the contact ring 403, and the bottom end of the knock rod 9 is connected and fixedly provided with a sliding frame 901, and the other end of the sliding frame 901 is slidably matched with the annular frame 7. Under the action of the annular rack 101, the meshing adjustment wheel 802 rotates, and the adjustment wheel 802 drives the connected transmission rod 801 to rotate, so that the transmission rod 801 drives the worm sleeve 803 to rotate, so that the worm sleeve 803 drives the worm wheel 804 to rotate, and the worm wheel 804 drives the two L-shaped rods 805 to rotate, and the L-shaped rod 805 slides in the sliding frame 901, thereby driving the knock rod 9 connected to the sliding frame 901 to move back and forth.

[0027] like Figure 8 As shown, the bottom end of the reciprocating screw 10 is connected and fixedly provided with a driven wheel 1001, the driven wheel 1001 is meshed with the driving wheel 603 for transmission, the outer wall of the reciprocating screw 10 is slidably provided with a moving seat 1002, the two ends of the moving seat 1002 are slidably provided with the inner wall of the top frame 2, and one side of the moving seat 1002 is connected and fixedly provided with a limiting block 1003, and the limiting block 1003 is slidably provided with the inner wall of the limiting groove 703. The rotation of the rotating shaft 602 will drive the connected driving wheel 603 to rotate, so that the driving wheel 603 drives the reciprocating screw 10 connected to the driven wheel 1001 to rotate, so that the reciprocating screw 10 drives the moving seat 1002 to move up and down, and at this time, the moving seat 1002 will drive the annular frame 7 with the limiting groove 703 to move up and down through the connected limiting block 1003.

[0028] A method for using a MIM injection molding device for high-strength and high-toughness metal parts comprises the following steps: S1. When the rotor parts need to be injection molded, the upper mold base 4 and the lower mold base 5 are first molded together, and then the metal powder mixture is injected into the upper mold base 4 and the lower mold base 5 through the injection cylinder 3; S2. During injection, the transmission mechanism 6 can drive the upper die base 4 and the lower die base 5 to swing back and forth, so that the metal powder mixture inside is evenly filled; S3, at the same time, the transmission mechanism 6 drives the annular frame 7 to rotate, so that the knocking rod 9 rotates, and driven by the adjustment mechanism 8, the knocking rod 9 continuously knocks, so that the upper die base 4 and the lower die base 5 vibrate, thereby improving the molding quality; S4. At the same time, the transmission mechanism 6 drives the reciprocating screw rod 10 to move the annular frame 7 up and down, thereby increasing the striking range of the striking rod 9.

[0029] Working principle: When the rotor parts need to be injection molded, the upper mold base 4 and the lower mold base 5 are firstly closed by the hydraulic rod 402, and then the metal powder mixture is injected into the upper mold base 4 and the lower mold base 5 through the injection cylinder 3; At this time, the motor 601 is used to drive the rotating shaft 602 to rotate, so that the rotating shaft 602 drives the connected cylindrical cam 604 to rotate, so that the annular inclined groove outside the cylindrical cam 604 drives the rack 606 connected to the guide rod 605 to move back and forth, thereby driving the gear 502 to swing back and forth, so that the gear 502 drives the lower die base 5 connected to the rotating column 501 to swing back and forth, and at the same time, the lower die base 5 drives the lower die base 5 to swing along; At the same time, the rotation of the rotating shaft 602 will drive the connected transmission wheel 607 to rotate, so that the transmission wheel 607 drives the toothed disc 702 to rotate, so that the toothed disc 702 drives the connected rotating frame 701 to rotate, so that the rotating frame 701 rotates, and then under the action of the annular rack 101, the meshing adjusting wheel 802 rotates, and at this time the adjusting wheel 802 drives the connected transmission rod 801 to rotate, so that the transmission rod 801 drives the worm sleeve 803 to rotate, so that the worm sleeve 803 drives the worm wheel 804 to rotate, so that the worm wheel 804 drives the two L-shaped rods 805 to rotate, and at this time the L-shaped rod 805 will slide in the sliding frame 901, thereby driving the knocking rod 9 connected to the sliding frame 901 to move back and forth, and continuously knock on the contact ring 403; At the same time, the rotation of the rotating shaft 602 will drive the connected driving wheel 603 to rotate, so that the driving wheel 603 drives the reciprocating screw 10 connected to the driven wheel 1001 to rotate, so that the reciprocating screw 10 drives the moving seat 1002 to move up and down. At this time, the moving seat 1002 will drive the annular frame 7 with the limiting groove 703 to move up and down through the connected limit block 1003, so that the knocking rod 9 can knock over a large range.

[0030] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A MIM injection molding device for high-strength and high-toughness metal parts, comprising a base (1), characterized in that: A top frame (2) is fixedly connected to the base (1), an injection cylinder (3) is arranged on the lower side of the top frame (2), an upper die seat (4) is rotatably connected to the bottom end of the injection cylinder (3), a lower die seat (5) is rotatably connected to the base (1), a transmission mechanism (6) is fixedly connected to the base (1), an annular frame (7) is slidably provided on the base (1), a plurality of adjustment mechanisms (8) are rotatably provided on the annular frame (7), a knocking rod (9) is slidably provided on the annular frame (7), and a reciprocating screw rod (10) is rotatably provided on the inner wall of the bottom end of the top frame (2).

2. The MIM injection molding device for high-strength and high-toughness metal parts according to claim 1, characterized in that: A movable frame (401) is rotatably connected to the upper die seat (4), hydraulic rods (402) are fixedly mounted on both ends of the movable frame (401), the other end of the hydraulic rod (402) is fixedly connected to the top frame (2), and contact rings (403) are fixedly connected to the outer sides of the upper die seat (4) and the lower die seat (5).

3. The MIM injection molding device for high-strength and high-toughness metal parts according to claim 1, characterized in that: The transmission mechanism (6) comprises a motor (601), the motor (601) being connected and fixedly arranged with the base (1), the output end of the motor (601) being connected and fixedly arranged with a rotating shaft (602), one end of the rotating shaft (602) being connected and fixedly arranged with a driving wheel (603), and the other end of the rotating shaft (602) being connected and fixedly arranged with a cylindrical cam (604).

4. The MIM injection molding device for high-strength and high-toughness metal parts according to claim 3 is characterized in that: A guide rod (605) is slidably provided on the cylindrical cam (604); a rack (606) is fixedly connected to one end of the guide rod (605); a slider (608) is fixedly connected to the lower surface of the rack (606); the slider (608) is slidably provided with the base (1); a rotating column (501) is fixedly connected to the bottom end of the lower die base (5); the rotating column (501) is rotatably connected to the base (1); a gear (502) is fixedly connected to the rotating column (501); the gear (502) is meshed with the rack (606) for transmission; and a transmission wheel (607) is fixedly connected to one end of the cylindrical cam (604).

5. The MIM injection molding device and method for high-strength and high-toughness metal parts according to claim 1, characterized in that: A rotating frame (701) is slidably provided on the lower side of the annular frame (7), a toothed disc (702) is fixedly connected to the lower side of the rotating frame (701), the toothed disc (702) is meshed with a transmission wheel (607) for transmission, the toothed disc (702) is rotatably connected to the base (1), and a limiting groove (703) is provided on the outer side of the annular frame (7).

6. The MIM injection molding device for high-strength and high-toughness metal parts according to claim 1, characterized in that: The adjustment mechanism (8) comprises a transmission rod (801), the transmission rod (801) is slidably matched with the annular frame (7), the bottom end of the transmission rod (801) is rotatably connected to the rotating frame (701), the bottom end of the transmission rod (801) is connected and fixedly provided with an adjustment wheel (802), the adjustment wheel (802) is meshingly transmission-arranged with an annular rack (101) connected to the base (1), a worm sleeve (803) is slidably matched with the transmission rod (801), the worm sleeve (803) is rotatably connected to the annular frame (7), a worm wheel (804) is meshingly transmission-arranged on one side of the worm sleeve (803), the worm wheel (804) is rotatably connected to the annular frame (7), and both ends of the worm wheel (804) are connected and fixedly provided with L-shaped rods (805).

7. The MIM injection molding device for high-strength and high-toughness metal parts according to claim 1, characterized in that: One end of the knocking rod (9) is movably contacted with the contact ring (403), and the bottom end of the knocking rod (9) is connected and fixedly provided with a sliding frame (901), and the other end of the sliding frame (901) is slidably matched with the annular frame (7).

8. The MIM injection molding device for high-strength and high-toughness metal parts according to claim 1, characterized in that: A driven wheel (1001) is fixedly connected to the bottom end of the reciprocating screw rod (10), and the driven wheel (1001) is meshed with the driving wheel (603) for transmission. A moving seat (1002) is slidably arranged on the outer wall of the reciprocating screw rod (10), and both ends of the moving seat (1002) are slidably arranged on the inner wall of the top frame (2). A limiting block (1003) is fixedly connected to one side of the moving seat (1002), and the limiting block (1003) is slidably arranged on the inner wall of the limiting groove (703).

9. A method for using a MIM injection molding device for high-strength and high-toughness metal parts, using the MIM injection molding device for high-strength and high-toughness metal parts according to any one of claims 1 to 8, comprising the following steps: S1. When injection molding of a rotor part is required, firstly, the upper mold base (4) and the lower mold base (5) are molded together, and then a metal powder mixture is injected into the upper mold base (4) and the lower mold base (5) through an injection cylinder (3); S2. During injection, the transmission mechanism (6) can drive the upper die base (4) and the lower die base (5) to swing back and forth, so that the metal powder mixture inside is evenly filled; S3, at the same time, the transmission mechanism (6) drives the annular frame (7) to rotate, thereby causing the knocking rod (9) to rotate. Driven by the adjustment mechanism (8), the knocking rod (9) continuously knocks, causing the upper die base (4) and the lower die base (5) to vibrate, thereby improving the molding quality; S4. At the same time, the transmission mechanism (6) drives the reciprocating screw rod (10), so that the annular frame (7) moves up and down, thereby increasing the striking range of the striking rod (9).

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