MIM injection molding multi-mold-cavity precise magnetic attraction part suction method

Abstract

The invention discloses an MIM injection molding multi-mold-cavity precise magnetic attraction part suction method, and belongs to the technical field of MIM injection molding molds and production devices. Injection molding is carried out on the basis of a glue feeding mode of point glue feeding, and the point gate can be located on the concave surface of the product, so that the contact surface of the gate and the product body is small, the gate can be conveniently removed in a mold when the mold is opened, and the integrity of the molded product is guaranteed; by means of the magnetic type material taking jig, the problem that due to the fact that a protruding mold core is arranged on a female mold, the contact force between a formed product and the female mold is large, and demolding is difficult can be solved, and rapid material taking and discharging are achieved; according to the magnetic type material taking jig, the magnetic type material taking jig is in positioning contact with a product in advance, then adsorption / separation is conducted through the movable magnet, and meanwhile the separation air cylinder is arranged in a matched mode, so that material taking and discharging operation can be conducted rapidly and accurately.

Description

Technical Field

[0001] The invention belongs to the technical field of MIM injection molding dies and production devices, and in particular relates to a MIM injection molding multi-cavity precision magnetic suction component method. Background Art

[0002] In the existing MIM injection molding process, for some product structures with overall curved surfaces, the general molding injection mold adopts a submerged gate as the injection method. In the mold, the concave cavity is set on the mother mold, and the convex core is set on the male mold. In this way, the contact force between the molded product and the mother mold is small, which is convenient for material removal; however, based on the mold structure design, the gate and the product molding cavity cannot be directly connected, and the molten material needs to be introduced from the direction opposite to the injection direction, which causes a loss of injection pressure during injection molding, and a slender ejector pin needs to be provided, and a secondary ejection method is adopted, which affects the design, processing, use and maintenance of the mold; in addition, after the product is molded, the gate at the bottom needs to be removed manually, and there will be a situation where the gate is unevenly broken, and the product cavity number also needs to be manually operated, which increases a lot of labor time costs. Summary of the invention

[0003] In view of the above problems existing in the prior art, the object of the present invention is to provide a method for MIM injection molding multi-cavity precision magnetic suction parts, which can realize in-mold de-gating and cooperate with a fixture to achieve rapid material removal.

[0004] The present invention provides the following technical solutions: a MIM injection molding multi-cavity precision magnetic suction component method, which is based on a multi-cavity injection mold using a point-in-gluing method and a magnetic suction material removal fixture, wherein the multi-cavity injection mold is arranged on an injection molding machine, a core for molding a product is arranged on a female mold body in a female mold, and a cavity for molding a product is arranged on a male mold body in a male mold; the magnetic suction material removal fixture is connected to a manipulator; the specific steps of the magnetic suction component method are as follows: S1, multi-cavity injection mold for injection molding, product molding; S2. The male and female molds of the multi-cavity injection mold are opened. During the mold opening process, the male mold moves outward under the traction of the injection molding machine, and the female mold body and the stripper plate in the female mold are driven to move in sequence through the connecting piece arranged between the male and female molds and the linkage rod arranged on the female mold, so that the product and the sprue, and the sprue and the mold are separated in sequence; S3, the manipulator drives the magnetic suction material picking fixture to move to the main body of the mother mold, so that the contact structure on the fixture that matches the product shape corresponds to the product one by one; S4, the magnetic part set in the magnetic suction material picking fixture moves to adsorb the product. After the product is adsorbed, the magnetic suction material picking fixture is pushed outward by the cylinder to separate the product from the mother mold body; S5. The robot moves, the material picking fixture exits the mold operation area, and is placed flat on the corresponding carrier; the magnetic part retreats, and the product falls on the carrier with the corresponding hole number.

[0005] Furthermore, the mold cavity and the mold core are arranged in one-to-one correspondence, and an injection molding cavity for product molding is formed therebetween.

[0006] Furthermore, a point gate connected to the injection cavity is provided in the core.

[0007] Furthermore, the mother mold also includes a mother mold base plate, the stripper plate is arranged on the mother mold base plate, and a runner connected to the point gate is arranged on the mother mold base plate, and the runner is connected to the injection port.

[0008] Furthermore, the connecting member is provided with two strip grooves arranged in sequence along the length direction; the male mold body and the female mold body are both fixedly provided with linkage members, and the linkage members on the two bodies are respectively arranged in the corresponding strip grooves.

[0009] Furthermore, the mother mold body can be movably set on a group of guide columns, and the guide columns are provided with limit members for limiting the movement of the mother mold body; one end of the linkage rod is fixedly set on the mother mold body, and the other end passes through the stripping plate, and the end of the other end is provided with a contact head for driving the stripping plate to move.

[0010] Furthermore, the magnetic material picking jig includes a jig frame, on which is provided a picking plate for contacting the molded product and a magnetic component for adsorbing the product, and the picking plate is provided with a separation cylinder for separating the jig from the mold when picking up the material.

[0011] Furthermore, a group of cavities are opened on the material taking plate, and contact structures matching the product appearance are arranged on the outside of the cavities, and the contact structures are arranged in a one-to-one correspondence with the injection molding cavities.

[0012] Furthermore, the separation cylinder is arranged on both sides of the material picking plate; the magnetic component includes a pushing cylinder and a group of magnetic parts whose movement is controlled by the pushing cylinder. The magnetic parts correspond to the cavities one by one and can move along the corresponding cavities under the control of the pushing cylinder.

[0013] Furthermore, a positioning column is provided on the main body of the mother mold, and a positioning hole matching with the positioning column is provided on the material taking plate.

[0014] By adopting the above technology, compared with the prior art, the beneficial effects of the present invention are as follows: 1) In the method of the present invention, based on the structural setting of setting the core on the female mold and setting the cavity on the male mold in the multi-cavity injection mold, when the point-injection method is adopted, the point gate can be located at the concave surface of the product, so that the contact surface between the gate and the product body is small, which is convenient for removing the gate in the mold when opening the mold, thereby ensuring the integrity of the product after molding; 2) The present invention adopts a point-injection injection method to perform injection molding on the curved surface structure product. The point gate can be directly connected to the product molding cavity. Through the provided connecting parts and linkage rods, the product and the material head, and the material head and the mold can be driven to separate in turn, and the product can be taken out by cooperating with a magnetic suction material taking fixture; the design of this structure cancels the setting of the ejector assembly in the existing mold, and can facilitate the design of the runner arrangement, while fully utilizing the injection pressure, providing a multi-cavity molding method; 3) In the present invention, the magnetic material taking fixture is set up, based on the magnetic characteristics of the product in the MIM injection molding process, it can solve the problem of difficulty in demoulding caused by the large contact force between the molded product and the mother mold due to the structural design of the raised core on the mother mold, and realize rapid material taking and discharging; 4) In the magnetic material-taking fixture of the present invention, by pre-positioning and contacting with the product, and then adsorbing / detaching through a movable magnet, and cooperating with the provided detachment cylinder, the material-taking and material-discharging operations can be performed quickly and accurately; and when taking the material, the fixture and the mold can be separated quickly and smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The schematic diagram of the internal cross-sectional structure of the mold of the present invention when the mold is closed; Figure 2 This is a schematic diagram of the overall cross-sectional structure of the mold of the present invention when the male and female molds are separated when the mold is opened; Figure 3 This is a schematic diagram of the overall cross-sectional structure of the mold after the main body of the mother mold moves when the mold of the present invention is opened; Figure 4 This is a schematic diagram of the overall cross-sectional structure of the mold of the present invention after the stripper plate moves when the mold is opened; Figure 5 It is a schematic diagram of the overall cross-sectional structure of the jig of the present invention when it is moved to the product position; Figure 6 This is a schematic diagram of the overall cross-sectional structure of the magnetic member when absorbing the product in the present invention; Figure 7 for Figure 4 A schematic diagram of the enlarged structure at A in the middle; Figure 8 for Figure 4 A schematic diagram of the enlarged structure at B in the middle; Fig. 9 for Figure 5Schematic diagram of the enlarged structure at C in the middle; Fig.10 for Figure 6 Schematic diagram of the enlarged structure at D in the middle; Fig.11 It is an enlarged structural schematic diagram of the material taking plate when the jig of the present invention sucks the product; Fig.12 It is an enlarged structural schematic diagram of the material taking plate when the separation cylinder of the present invention is ejected; Fig.13 It is a schematic diagram of the three-dimensional structure of the mold of the present invention; Fig.14 It is a schematic diagram of the three-dimensional structure of one side of the jig of the present invention; Fig.15 It is a schematic diagram of the three-dimensional structure of the other side of the jig of the present invention; Fig.16 It is a schematic cross-sectional structural diagram of the fixture of the present invention; Fig.17 This is a schematic diagram of the runner and gate structure of the product injection molding in the present invention; Fig.18 It is a schematic diagram of the runner and gate structure of product injection molding in the prior art. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments of the specification. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] On the contrary, the present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. Those skilled in the art can fully understand the present invention without the description of these details.

[0018] A MIM injection molding multi-cavity precision magnetic suction method is implemented for injection molding products with an overall curved surface structure based on a multi-cavity injection mold and a magnetic suction material removal fixture; wherein the multi-cavity injection mold adopts a point-in-point glue feeding method (such as Fig.17 As shown in the figure, it is installed on the injection molding machine; the magnetic suction material picking fixture uses an adjustable magnetic suction structure to quickly pick up and discharge the product based on the magnetic properties of the MIM injection molding product. It can be used to replace the existing glue feeding method (such as Fig.18 shown) for improvement.

[0019] Specifically, Figure 1 , Figure 3 , Fig.13 As shown, in this embodiment, the multi-cavity injection mold is a 24-cavity mold, and the multi-cavity injection mold includes a male mold 1 and a female mold 2; the male mold 1 includes a male mold body 101, and the male mold body 101 is provided with two detachable cavity plates, each cavity plate is provided with 12 cavities 102, and the front end of the cavity 102 is an overall concave curved surface structure.

[0020] The mother mold 2 includes a mother mold base plate 204, a stripper plate 203 and a mother mold body 201 which are arranged in sequence, a detachable core plate on the mother mold body 201, 24 cores 202 are installed on the core plate in the form of inserts, and the front end of the core 202 is a convex curved surface structure as a whole.

[0021] The mold cavity 102 and the mold core 202 are arranged in a one-to-one correspondence, and an injection cavity for product molding is formed therebetween. The convex curved surface of the molded product in the injection cavity faces outward, and when the mold is opened, the product is attached to the mold core 202.

[0022] Specifically, a point gate connected to the injection cavity is provided in the core 202; a runner connected to the point gate is provided on the mother mold base plate 204, and the runner is connected to the injection port.

[0023] Specifically, two connecting parts 7 are provided on both sides of the multi-cavity injection mold, and two linkage parts 9 are fixedly provided on both sides of the male mold body 101 and the female mold body 201 .

[0024] The connecting piece is a plate-like structure, on which two strip grooves 701 are provided along the length direction. The linkage member 9 is a screw, and each screw is placed in a corresponding strip groove 701, as shown in FIG13 .

[0025] When the injection molding machine drives the male mold body 101 to move, the linkage part 9 on the male mold body 101 slides in the corresponding strip groove 701. When it contacts the groove wall of the strip groove 701, it drives the connecting part 7 to move. The groove wall of another strip groove 701 on the connecting part 7 contacts the linkage part 9 on the female mold body 201, driving the female mold body 201 to move, thereby realizing the separation between the product and the material head.

[0026] Specifically, the mother mold body 201 is movably set on a group of guide pillars 10. On the mother mold body 201, the ends of the guide pillars 10 are provided with limiters to limit the mother mold body 201 during its movement to prevent it from being separated from the overall structure of the mother mold.

[0027] A linkage rod 8 is fixedly arranged on the mother mold body 201, and the other end of the linkage rod 8 passes through the stripper plate 203, and the end of the linkage rod 8 is provided with a contact head 801 for driving the stripper plate 203 to move. When the mother mold body 201 moves to a certain position driven by the connecting member 7, the contact head 801 on the linkage rod 8 contacts the stripper plate 203, driving the stripper plate 203 to move, so that the material head is separated from the mother mold.

[0028] In this embodiment, the injection molding structure and heating structure of the mold are all conventional settings for point-in-shot injection molding; the injection molding machine and the robot only need to realize conventional mold opening and movement control functions, and are all conventional equipment; no detailed introduction is given here.

[0029] In this embodiment, Figure 14-15 As shown, the magnetic suction material picking fixture includes a fixture frame, a picking plate 3 arranged on the fixture frame, and a magnetic component, and a separation cylinder 4 is arranged on the picking plate 3.

[0030] Specifically, the picking plate 3 is used to contact the molded product. It is fixed at the bottom of the jig frame and is provided with twenty-four cavities. One side of the picking plate 3 is located at the cavity mouth and is provided with a contact structure 301 that matches the shape of the raised side of the product. The contact structure 301 is arranged one-to-one with the injection cavity.

[0031] Specifically, the separation cylinder 4 is used to separate the jig from the mold when taking materials. There are two separation cylinders 4, which are fixedly arranged on both sides of the material taking plate 3, and their output ends are arranged toward the side of the contact structure 301 on the material taking plate 3. The material taking plate 3 is provided with a through hole for the ejector rod to pass through.

[0032] Specifically, Fig.16 As shown, the magnetic assembly is used to absorb the product, and includes a push cylinder 5 and twenty-four magnetic parts 6. The push cylinder 5 is fixedly arranged on the fixture frame, and its output end is arranged toward one side of the material-retrieving plate 3. A mounting plate is connected to the output end, and the magnetic parts 6 are fixedly mounted on the mounting plate, and each magnetic part 6 is arranged in a one-to-one correspondence with a cavity on the material-retrieving plate 3; the magnetic parts 6 are magnets, which can be inserted into the contact structure 301.

[0033] Specifically, the mother mold body 201 is provided with a positioning column, and the material removal plate 3 is provided with a positioning hole that matches the positioning column; through the matching structure between the positioning column and the positioning hole, rapid positioning between the mold and the jig can be achieved, which facilitates the jig to quickly remove materials.

[0034] The specific steps of the magnetic attraction method of this embodiment are as follows: S1, multi-cavity injection mold for injection molding, product molding. Figure 1 shown.

[0035] S2, male and female mold opening of multi-cavity injection mold (such as Figure 2 As shown in the figure, during the mold opening process, the male mold 1 moves outward under the traction of the injection molding machine, the linkage member 9 on the male mold body 101 moves, driving the connecting member 7 to move, and then the female mold body 201 is driven to move by the connecting member 7 on the female mold body 201, so that the product and the material head (as shown in the figure) are in a stable state. Figure 3 As shown); when the mother mold body 201 moves to a certain position, the contact head 801 of the linkage rod 8 installed on the mother mold body 201 contacts the stripper plate 203, driving the stripper plate 203 to separate from the mother mold base plate 204, so that the stripper head is separated from the mold (as shown in FIG. Figure 4 , Figure 7 as shown).

[0036] S3, the manipulator drives the magnetic suction material removal fixture to move to the mother mold body 201, so that the contact structure 301 on the fixture that matches the product shape contacts the product one by one (such as Figure 5 , Figure 8 , Fig. 9 as shown).

[0037] S4, the magnetic member 6 set in the magnetic suction material picking fixture moves to absorb the product (such as Figure 6 , Fig.10 As shown in the figure), after the product adsorption is completed, the magnetic suction material picking fixture is ejected outwards through the separation cylinder 4 (the state before and after ejection is as shown in the figure). Figure 11-12 As shown), during ejection, the robot arm synchronously retreats to separate the product from the mother mold body 201; the separation cylinder 4 is used for early ejection operation to avoid the robot arm directly taking out the product, which may cause unstable removal due to its long force arm.

[0038] S5. The robot moves, the material picking fixture exits the mold operation area, and is placed flat on the corresponding carrier; the magnetic part 6 retreats, and the product falls on the carrier with the corresponding hole number.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for MIM injection molding multi-cavity precision magnetic suction parts, characterized in that: Based on a multi-cavity injection mold and a magnetic material removal fixture using a point-in-gluing method, the multi-cavity injection mold is arranged on an injection molding machine, a core (202) for molding a product is arranged on a female mold body (201) in a female mold (2), and a cavity (102) for molding a product is arranged on a male mold body (101) in a male mold (1); the magnetic material removal fixture is connected to a robot; the specific steps of the magnetic material removal method are as follows: S1, multi-cavity injection mold for injection molding, product molding; S2, the male and female molds of the multi-cavity injection mold are opened. During the mold opening process, the male mold (1) moves outward under the traction of the injection molding machine, and the female mold body (201) and the stripper plate (203) in the female mold (2) are driven to move in sequence through the connecting piece (7) arranged between the male mold (1) and the female mold (2) and the linkage rod (8) arranged on the female mold (2), so that the product and the sprue, and the sprue and the mold are separated in sequence; S3, the manipulator drives the magnetic suction material taking fixture to move to the mother mold body (201), so that the contact structure (301) on the fixture that matches the product shape corresponds to the product one by one; S4, the magnetic member (6) disposed in the magnetic material taking fixture moves to adsorb the product, and after the product is adsorbed, the magnetic material taking fixture is pushed outward by the cylinder, so that the product is separated from the mother mold body (201); S5. The robot moves, the material picking fixture exits the mold operation area, and is placed flat on the corresponding carrier; the magnetic part (6) retracts, and the product falls onto the carrier with the corresponding hole number.

2. A MIM injection molding multi-cavity precision magnetic suction component method according to claim 1, characterized in that: The mold cavity (102) and the mold core (202) are arranged in a one-to-one correspondence, and an injection molding cavity for product molding is formed between the two.

3. A MIM injection molding multi-cavity precision magnetic suction component method according to claim 2, characterized in that: The core (202) is provided with a point gate which is connected to the injection cavity.

4. A method for MIM injection molding multi-cavity precision magnetic suction parts according to claim 3, characterized in that: The mother mold (2) further comprises a mother mold base plate (204), the stripper plate (203) is arranged on the mother mold base plate (204), a runner connected to the point gate is arranged on the mother mold base plate (204), and the runner is connected to the injection port.

5. A method for MIM injection molding multi-cavity precision magnetic suction parts according to claim 4, characterized in that: The connecting member (7) is provided with two strip grooves (701) arranged in sequence along the length direction; the male mold body (101) and the female mold body (201) are both fixedly provided with linkage members (9), and the linkage members (9) on the two bodies are respectively arranged in the corresponding strip grooves (701).

6. A method for MIM injection molding multi-cavity precision magnetic suction parts according to claim 5, characterized in that: The mother mold body (201) is movably arranged on a group of guide pillars (10), and the guide pillars (10) are provided with limit members for limiting the movement of the mother mold body (201); one end of the linkage rod (8) is fixedly arranged on the mother mold body (201), and the other end passes through the stripping plate (203), and the end of the other end is provided with a contact head (801) for driving the stripping plate (203) to move.

7. A method for MIM injection molding multi-cavity precision magnetic suction parts according to claim 6, characterized in that: The magnetic suction material picking fixture comprises a fixture frame, on which a picking plate (3) for contacting the molded product and a magnetic component for adsorbing the product are arranged, and the picking plate (3) is provided with a separation cylinder (4) for separating the fixture from the mold when picking up the material.

8. A method for MIM injection molding multi-cavity precision magnetic suction parts according to claim 7, characterized in that: The material taking plate (3) is provided with a group of cavities, and contact structures (301) matching the product shape are provided on the outside of the cavities, and the contact structures (301) are arranged in a one-to-one correspondence with the injection molding cavities.

9. A method for MIM injection molding multi-cavity precision magnetic suction parts according to claim 8, characterized in that: The separation cylinder (4) is arranged on both sides of the material taking plate (3); the magnetic assembly comprises a pushing cylinder (5) and a group of magnetic parts (6) whose movement is controlled by the pushing cylinder (5); the magnetic parts (6) correspond to the cavities one by one and can move along the corresponding cavities under the control of the pushing cylinder (5).

10. A method for MIM injection molding multi-cavity precision magnetic suction parts according to claim 9, characterized in that: The mother mold body (201) is provided with a positioning column, and the material taking plate is provided with a positioning hole matching the positioning column.

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