Tool positioning jig for injection molding of magnetic collection block

Abstract

The tool positioning jig comprises a base, one end of the base is provided with a pushing assembly, the pushing assembly comprises a side plate, a lower bottom plate and an upper pushing plate, the two ends of the lower bottom plate are fixedly connected with the side face of the side plate, and the upper pushing plate is fixedly connected with the side face of the lower bottom plate. The two ends of the upper push plate are movably connected with the side faces of the side plates, a plurality of clamping blocks are arranged at one end of the lower bottom plate, positioning blocks used for clamping and fixing the magnetic collection blocks are arranged at one ends of the clamping blocks, one ends of the positioning blocks extend outwards to form a plurality of pressing parts, positioning grooves are formed among the pressing parts, and the pressing parts are arranged in the positioning grooves. A plurality of ejector rods are arranged at one end of the pressing part; according to the tool positioning jig for injection molding of the magnetic collection block, the appearance of the magnetic collection block can be adapted through the structural design of the positioning groove and the pressing part, and the uniform force application of the multi-point ejector rod is matched, so that the deviation of the magnetic collection block in the injection molding process is avoided, and the injection molding yield is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of positioning fixtures, specifically a tooling positioning fixture for injection molding of magnetic blocks. Background Technology

[0002] Magnetic collectors, as key magnetic conductive components in electromagnetic assemblies, are widely used in motors, sensors, and magnetic actuators. Their manufacturing process involves injection molding, where magnetic materials are bonded to a plastic matrix. During this process, a positioning fixture plays a crucial role in precisely positioning the magnetic collector within the mold cavity. Traditional magnetic collector positioning fixtures typically employ a rigid slot combined with a single-point clamping mechanism. Their working principle involves using mechanical clips or spring plates to constrain the magnetic collector on one side, maintaining the workpiece's position during the injection molding machine's mold closing phase.

[0003] However, existing positioning fixtures have significant drawbacks in practical applications: First, due to their magnetic conductivity, magnetic collecting blocks often employ a stacked structure with irregularly shaped protrusions. Traditional single-point clamping methods cannot achieve multi-directional synchronous positioning, leading to slight displacement of the workpiece under injection pressure (typically 80-120 MPa). Second, the shear flow of molten plastic during injection molding generates lateral impact forces as high as 500-800 N. Existing fixtures lack multi-point dynamic compensation mechanisms, resulting in uneven contact stress distribution on the clamping surfaces (measured data shows stress concentration of up to 4.2 MPa at the front clamping area and only 0.8 MPa at the rear). This stress gradient directly causes an axial offset of 0.1-0.3 mm in the magnetic collecting block, making the positioning fixture clamping unstable and prone to displacement after clamping. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technical solutions, this utility model provides a tooling positioning fixture for injection molding of magnetic blocks, which can effectively solve the technical problem that the existing positioning fixture is unstable in clamping and easily causes the magnetic blocks to deviate after clamping.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a tooling positioning fixture for injection molding of magnetic blocks, including a base, one end of which is provided with a pushing component, the pushing component including a side plate, a lower base plate and an upper push plate, both ends of the lower base plate are fixedly connected to the side of the side plate, both ends of the upper push plate are movably connected to the side of the side plate, one end of the lower base plate is provided with a plurality of clamping blocks, one end of the clamping blocks is provided with a positioning block for clamping and fixing the magnetic blocks, one end of the positioning block extends outward to form a plurality of pressing parts, a positioning groove is formed between the plurality of pressing parts, one end of the pressing part is provided with a plurality of push rods, one end of the push rods passes through the lower base plate and is connected to the upper push plate, the side of the positioning block is provided with a plurality of pull plates, one end of the pull plates passes through the lower base plate and is connected to the upper push plate.

[0006] Furthermore, the side of the side plate extends outward to form a first blocking strip and a second blocking strip. The first blocking strip and the second blocking strip are used to limit the movement distance of the push plate, and the first blocking strip and the second blocking strip are symmetrically arranged.

[0007] Furthermore, one end of the base is recessed inward to form two limiting grooves, which are symmetrically arranged between each other, and one end of the base extends outward to form a top block.

[0008] Furthermore, one end of the base is recessed inward to form several circular grooves, which are symmetrically arranged between adjacent circular grooves. The circular grooves extend into the interior of the base. The upper push plate is provided with several movable rods, and the bottom of the upper push plate is provided with several fastening seats. The movable rods are fixedly connected to the upper push plate through the fastening seats. One end of the movable rod extends outward and passes through the lower base plate and is movably connected to the lower base plate.

[0009] Furthermore, one end of the base is provided with two support plates, which are symmetrically arranged. One end of each support plate is fixedly connected to the lower base plate. The surface of each support plate is provided with a semi-circular groove that extends along the length of the support plate. The surface of the movable rod is slidably connected to the groove.

[0010] Furthermore, a connecting plate is provided between the two side plates, and the two side plates are fixed together by the connecting plate. A top plate is fixedly provided on the top of the push plate, and a pusher is provided on the top of the top plate. One end of the pusher passes through the connecting plate and extends to the outside of the connecting plate. The pusher is movably connected to the connecting plate.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the tooling positioning fixture for injection molding of magnetic blocks of this utility model, through the linkage design of the positioning block and the pressing part, realizes multi-point precise clamping of the magnetic block by utilizing the synchronous movement of the push rod and the pull plate. The structural design of the positioning groove and the pressing part can be adapted to the shape of the magnetic block. With the uniform force applied by the multi-point push rod, the magnetic block is avoided from shifting during the injection molding process, which significantly improves the injection molding yield. Attached Figure Description

[0012] Figure 1 This is a perspective view of the tooling positioning fixture for injection molding of magnetic blocks according to this utility model;

[0013] Figure 2 This is a perspective view of the base of the tooling positioning fixture for injection molding of magnetic blocks according to this utility model;

[0014] Figure 3 This is a perspective view of the propulsion component of the tooling positioning fixture for injection molding of magnetic blocks according to this utility model;

[0015] Figure 4 This is a bottom view of the propulsion component of the tooling positioning fixture for injection molding of magnetic blocks according to this utility model.

[0016] Numbering on the map:

[0017] 1-Side plate; 2-Push handle; 3-Connecting plate; 4-Top plate; 5-Upper push plate; 6-Lower base plate; 7-Second blocking strip; 8-Modular rod; 9-Pull plate; 10-Top rod; 11-Clamping block; 12-Positioning block; 13-Pressing part; 14-Positioning groove; 15-Support plate; 16-Base; 17-Limiting groove; 18-Top block; 19-Circular groove; 20-Sliding groove; 21-Fastening seat; 22-First blocking strip. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] The following is combined with Figures 1-4 The tooling positioning fixture for injection molding of magnetic blocks according to this utility model is described in detail as follows:

[0020] A tooling positioning fixture for injection molding magnetic blocks includes a base 16. One end of the base 16 is provided with a pushing assembly, which includes a side plate 1, a lower base plate 6, and an upper push plate 5. Both ends of the lower base plate 6 are fixedly connected to the side of the side plate 1, and both ends of the upper push plate 5 are movably connected to the side of the side plate 1. One end of the lower base plate 6 is provided with a plurality of clamping blocks 11, and one end of the clamping blocks 11 is provided with a positioning block 12 for clamping and fixing the magnetic blocks. One end of the positioning block 12 extends outward to form a plurality of pressing parts 13, and a positioning groove 14 is formed between the plurality of pressing parts 13. One end of the pressing part 13 is provided with a plurality of push rods 10, one end of the push rod 10 passes through the lower base plate 6, and one end of the push rod 10 is connected to the upper push plate 5. The side of the positioning block 12 is provided with a plurality of pull plates 9, one end of the pull plates 9 passes through the lower base plate 6, and one end of the pull plates 9 is connected to the upper push plate 5.

[0021] The side of the side plate 1 extends outward to form a first blocking strip 22 and a second blocking strip 7. The first blocking strip 22 and the second blocking strip 7 are used to limit the movement distance of the upper push plate 5. The first blocking strip 22 and the second blocking strip 7 are symmetrically arranged. One end of the base 16 is recessed inward to form two limiting grooves 17. The two limiting grooves 17 are symmetrically arranged. One end of the base 16 extends outward to form a top block 18.

[0022] One end of the base 16 is recessed inward to form several circular grooves 19, which are symmetrically arranged between adjacent grooves. The circular grooves 19 extend into the interior of the base 16. The upper push plate 5 is provided with several movable rods 8, and the bottom of the upper push plate 5 is provided with several fastening seats 21. The movable rods 8 are fixedly connected to the upper push plate 5 through the fastening seats 21. One end of the movable rod 8 extends outward and passes through the lower base plate 6, where it is movably connected. One end of the base 16 is provided with two support plates 15, which are symmetrically arranged between each other. One end of the plate 15 is fixedly connected to the lower base plate 6. The surface of the support plate 15 is provided with a semi-circular groove 20, which extends along the length of the support plate 15. The surface of the movable rod 8 is slidably connected to the groove 20. A connecting plate 3 is provided between the two side plates 1, and the two side plates 1 are fixed together by the connecting plate 3. A top plate 4 is fixedly provided on the top of the upper push plate 5. A pusher 2 is provided on the top of the top plate 4. One end of the pusher 2 passes through the connecting plate 3 and extends to the outside of the connecting plate 3. The pusher 2 is movably connected to the connecting plate 3.

[0023] In this embodiment, the first blocking strip 22 and the second blocking strip 7 physically limit the excessive displacement of the upper push plate 5, avoiding mechanical collision damage, while ensuring that the positioning block 12 moves accurately within a safe stroke, extending the service life of the fixture. The slide groove 20 provides a limiting function for the movable rod 8, ensuring that the movable rod 8 always slides along the slide groove 20. The movable rod 8 is rigidly connected to the upper push plate 5 through the fastening seat 21 and slides in the slide groove 20, forming a double guide rail motion trajectory, eliminating the sway phenomenon when the upper push plate 5 moves, ensuring the precise alignment of the positioning block 12 and the magnetic block. The circular groove 19 provides radial constraint on the movable rod 8, controlling the positional deviation of each clamping action to the micrometer level, meeting the requirements of high-precision injection molding. The pusher 2 is connected to the upper push plate 5 through the top plate 4, allowing the operator to complete the opening and closing action of the fixture with one hand. The connecting plate 3 integrates the fixing function of the side plate 1 and the guiding function of the pusher 2, reducing the number of independent components, reducing the overall size of the fixture, and facilitating installation on the injection molding machine.

[0024] In this embodiment, the circular groove 19 is formed by deep hole drilling, and the surface roughness of the hole wall reaches Ra0.4. It forms a clearance fit with the movable rod 8, and the fit clearance is controlled within the range of 0.02-0.05mm. This ensures that the movable rod 8 slides smoothly and eliminates radial wobble through multi-point constraints. The propulsion component constitutes the core execution mechanism of the fixture. It is formed by welding the double side plates 1 and the lower base plate 6 to form a U-shaped frame. The side plates 1 are made of 7075 aluminum alloy and are aged and strengthened. The thickness reaches 15mm to ensure structural rigidity. The positioning block 12 set on the end face of the lower base plate 6 is made of tungsten steel. Its end is machined according to the contour of the magnetic block. The semi-circular groove 20 machined on the surface of the support plate 15 forms rolling friction with the movable rod 8. The cross section of the groove 20 is an optimized arc transition design. The radius is kept in a 1:1 ratio with the diameter of the movable rod 8 to ensure uniform stress distribution during movement. The connecting plate 3 undertakes the structural reinforcement function and can stabilize the two side plates 1.

[0025] The tooling positioning fixture for injection molding of magnetic blocks in this embodiment achieves multi-point precise clamping of magnetic blocks through the linkage design of positioning block 12 and pressing part 13, and the synchronous movement of top rod 10 and pull plate 9. The positioning groove 14 formed between the pressing parts 13 can accurately fit and clamp the magnetic blocks, effectively preventing displacement deviation during the injection molding process.

[0026] In practical use, the positioning fixture is installed on the injection molding machine. The bottom of the base 16 of the positioning fixture also has an injection hole. The magnetic block to be fixed and clamped is placed on the base 16. During injection molding, pushing the pusher 2 causes the top plate 4 to push the upper push plate 5 together, causing the movable rod 8 to move along the slide groove 20 on the support plate 15. The movable rod 8 moves within the circular groove 19, causing the upper push plate 5 to drive the pull plate 9 and the push rod 10 to move, allowing the pull plate 9 and the push rod 10 to pass through the lower base plate 6 and... The movement causes the pull plate 9 to move the positioning block 12, which in turn causes the push rod 10 to move the pressing part 13 until the bottom of the upper push plate 5 contacts the second blocking strip 7. The magnetic block is clamped and fixed by the positioning block 12, the pressing part 13 and the positioning groove 14. After the magnetic block is clamped and fixed, it is injected through the injection hole on the injection molding machine and the base 16. The molten plastic is injected into the base 16 through the injection molding machine and then combined with the clamped magnetic block to form a composite mold with the plastic matrix through the injection molding process.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A tooling positioning fixture for injection molding of magnetic blocks, comprising a base, one end of which is provided with a pushing assembly, the pushing assembly comprising a side plate, a lower base plate and an upper push plate, both ends of the lower base plate being fixedly connected to the side surface of the side plate, and both ends of the upper push plate being movably connected to the side surface of the side plate, characterized in that: A plurality of clamping blocks are provided at one end of the lower base plate, and a positioning block for clamping and fixing the magnetic collecting block is provided at one end of the clamping block. A plurality of pressing parts are formed at one end of the positioning block, and a positioning groove is formed between the plurality of pressing parts. A plurality of push rods are provided at one end of the pressing part, and one end of the push rod passes through the lower base plate and is connected to the upper push plate. A plurality of pull plates are provided on the side of the positioning block, and one end of the pull plate passes through the lower base plate and is connected to the upper push plate.

2. The tooling positioning fixture for injection molding of magnetic blocks according to claim 1, characterized in that: The side of the side plate extends outward to form a first blocking strip and a second blocking strip. The first blocking strip and the second blocking strip are used to limit the movement distance of the push plate. The first blocking strip and the second blocking strip are symmetrically arranged.

3. The tooling positioning fixture for injection molding of magnetic blocks according to claim 1, characterized in that: One end of the base is recessed inward to form two limiting grooves, which are symmetrically arranged. One end of the base extends outward to form a top block.

4. The tooling positioning fixture for injection molding of magnetic blocks according to any one of claims 1-3, characterized in that: One end of the base is recessed inward to form several circular grooves, which are symmetrically arranged between adjacent grooves. The circular grooves extend into the interior of the base. The upper push plate is provided with several movable rods, and the bottom of the upper push plate is provided with several fastening seats. The movable rods are fixedly connected to the upper push plate through the fastening seats. One end of the movable rod extends outward and passes through the lower base plate and is movably connected to the lower base plate.

5. The tooling positioning fixture for injection molding of magnetic blocks according to claim 4, characterized in that: Two support plates are provided at one end of the base, and the two support plates are symmetrically arranged. One end of the support plate is fixedly connected to the lower base plate. The surface of the support plate is provided with a semi-circular sliding groove, which extends along the length of the support plate. The surface of the movable rod is slidably connected to the sliding groove.

6. The tooling positioning fixture for injection molding of magnetic blocks according to claim 1, characterized in that: A connecting plate is provided between the two side plates, and the two side plates are fixed together by the connecting plate. A top plate is fixedly provided on the top of the upper push plate, and a pusher is provided on the top of the top plate. One end of the pusher passes through the connecting plate and extends to the outside of the connecting plate. The pusher is movably connected to the connecting plate.

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