Mandrel structure for positioning metal ring

Abstract

The utility model relates to the technical field of injection molding, and discloses a mandrel structure for positioning a metal ring, which comprises a lower mold body and an upper mold body which are matched with each other for use, the limiting assembly comprises an inserting rod, step grooves, a deformation cavity and protruding blocks, the deformation cavity is formed in the inserting rod, a plurality of protruding blocks are fixedly installed on the wall face of the inserting rod, a plurality of step grooves are further formed in the wall face of the inserting rod, and the inserting rod is connected with the core column in a clamped mode through the protruding blocks. The wall surfaces of the inserting rods near the upper end and the lower end of the metal ring can deform towards the deformation cavity to form the bosses, then radial limiting can be provided for the metal ring, the metal ring is kept in a suspended state in the injection molding process, and for limiting of the metal ring with the height smaller than that of the core column, a better fixing effect is achieved; and the wall surfaces near the upper and lower end surfaces of the metal ring can deform better.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding technical field especially relates to a core shaft structure for metal ring positioning. BACKGROUND

[0002] The plastic mold includes an upper mold assembly and a lower mold assembly matched with the upper mold assembly, and when automobile injection molding accessories are produced, some accessories need to be integrally formed with metal parts and injection molding parts, so the metal parts need to be fixed in advance during injection molding.

[0003] The prior art with the publication number CN218366260U discloses a new vertical shaft core linkage structure applied to an injection mold, the injection mold includes a lower mold plate and a lower mold base plate, a lower mold forming insert is arranged in an insert installation groove on the upper surface of the lower mold plate, and a lower mold forming groove is formed in the lower mold forming insert; a demolding push plate group is arranged between the lower mold plate and the lower mold base plate, a ball nut and a linkage push rod are arranged on the demolding push plate group, the upper end of the linkage push rod passes through a clearance hole of the lower mold plate and is screwed with the lower mold forming insert; the new vertical shaft core linkage structure applied to the injection mold further includes a ball screw, the lower end of the ball screw is installed on the lower mold base plate through a thrust bearing, and the ball screw and the ball nut are matched and form a ball screw pair; a mold core installation part is arranged on the upper end of the ball screw, a threaded hole mold core is screwed on the mold core installation part, and the threaded hole mold core is vertically limited and abuts against the lower mold plate.

[0004] In the prior art, a solid rubber columnar structure is inserted into the outer wall of the mold core to limit and fix the metal ring, for the metal ring with a height less than the height of the mold core, the upper and lower end faces of the metal ring are in a suspended state and lack support and limitation, and thus the metal ring is easy to deviate during injection molding, thereby affecting the product quality.

[0005] Therefore, the core shaft structure for metal ring positioning is provided. UTILITY MODEL CONTENTS

[0006] The utility model mainly solves the technical problem that the metal ring is easy to slide along the mold core in the radial direction, and provides the core shaft structure for metal ring positioning.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme, a core shaft structure for metal ring positioning, comprising:

[0008] The lower mold body and the upper mold body are used in cooperation, the top of the upper mold body is fixedly provided with an injection pipe, the top of the lower mold body is provided with a forming cavity for injection, and the inner bottom surface of the lower mold body is provided with an integrally formed core column;

[0009] The limiting assembly is detachably arranged on the wall surface of the core column and used for limiting the metal ring, and the limiting assembly comprises an insertion rod, a stepped groove, a deformation cavity and a protruding block, the inside of the insertion rod is provided with the deformation cavity, the wall surface of the insertion rod is fixedly provided with the protruding block, and the wall surface of the insertion rod is further provided with the stepped groove.

[0010] As a preferred mode of the utility model, the core column forms a cylindrical structure, and the circumferential surface of the core column is provided with a plurality of insertion grooves.

[0011] As a preferred mode of the utility model, the insertion rod is a cylindrical structure, the insertion groove is an arc-shaped notch in horizontal section, the insertion rod and the insertion groove are in interference fit, and the insertion rod and the insertion groove are in the same height.

[0012] As a preferred mode of the utility model, the deformation cavity is a circular through hole, and the stepped groove is arranged on the outer circumferential surface of the insertion rod.

[0013] As a preferred mode of the utility model, the stepped groove forms an arc-shaped notch in horizontal section, the depth of the stepped groove is smaller than the thickness of the wall surface of the insertion rod, and a spacing is left between the two adjacent stepped grooves.

[0014] As a preferred mode of the utility model, the protruding block is fixedly arranged on the outer circumferential surface of the insertion rod, the protruding block forms a fan-shaped block structure, the circumferential length of the protruding block is smaller than half of the circumferential length of the insertion rod, and the protruding block is located on the opposite surface of the stepped groove.

[0015] As a preferred mode of the utility model, the core column is provided with a plurality of anti-extraction grooves on the inner wall surface of the insertion groove, the anti-extraction grooves and the protruding block are used in cooperation, the protruding block is clamped into the corresponding anti-extraction groove to limit the radial sliding of the insertion rod.

[0016] The utility model provides a core shaft structure for metal ring positioning.

[0017] 1. The core shaft structure for metal ring positioning, the installation of the insertion rod is realized by inserting the insertion rod into the insertion slot, when the metal ring is sleeved outside the core column, the metal ring can extrude the insertion rod to deform, the deformation range of the insertion rod can be increased through the deformation cavity, the metal ring can tighten the insertion rod, the wall surface of the insertion rod near the upper end and the lower end of the metal ring can be deformed to form a boss towards the deformation cavity through the step groove, thereby the radial limiting of the metal ring is provided, the metal ring remains in a suspended state during injection molding, the fixing effect is better for the limiting of the metal ring with a height less than the core column, when the hollow insertion rod is extruded by the injection material, the wall surface near the upper and lower end surfaces of the metal ring can better deform, and the position of the metal ring can be adjusted, the inner circumference of the metal ring is supported by the plurality of insertion rods, the concentricity of the metal ring and the core column is ensured, the product quality after molding is ensured, and the insertion rod can be replaced in time after wear, thereby facilitating later maintenance and maintenance.

[0018] 2. The core shaft structure for metal ring positioning, the radial sliding of the insertion rod is limited by the protrusion which is clamped into the anti-dropping groove when the insertion rod is inserted into the insertion slot, thereby the anti-dropping effect of the insertion rod is better, the insertion rod can be inserted into the insertion slot from the side of the core column, or the insertion rod can be inserted from the upper side of the insertion slot, the stability of the insertion rod after installation is higher, and the insertion rod is not easy to fall off during demolding. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a whole perspective view of the utility model;

[0020] Figure 2 It is a lower die body perspective view of the utility model;

[0021] Figure 3 It is a core column partial section view of the utility model;

[0022] Figure 4 It is a core column perspective view of the utility model;

[0023] Figure 5 It is one of insertion rod perspective views of the utility model;

[0024] Figure 6 It is the second core column perspective view.

[0025] Legend: 10, lower die body; 11, upper die body; 12, forming cavity; 13, core column; 14, insertion slot; 15, anti-dropping groove; 20, insertion rod; 21, step groove; 22, deformation cavity; 23, protrusion. DETAILED DESCRIPTION

[0026] A core shaft structure for metal ring positioning, as shown in Figure 1 and Figure 2 , comprising:

[0027] The lower die body 10 and the upper die body 11 are used in cooperation, the top of the upper die body 11 is fixedly provided with a feeding pipe, the top of the lower die body 10 is provided with a forming cavity 12 for feeding, the inner bottom surface of the lower die body 10 is provided with a core column 13 integrally formed, the annular bushing structure is formed by feeding into the forming cavity 12 through the feeding pipe, the core column 13 is used for limiting the metal ring, so that the annular structure formed by injection molding is integrally formed with the metal ring, which is a known technology and will not be described here;

[0028] As shown in Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the limiting assembly is detachably arranged on the wall surface of the core column 13 for limiting the metal ring, the limiting assembly comprises a plug rod 20, a stepped groove 21, a deformation cavity 22 and a protruding block 23, the inner portion of the plug rod 20 is provided with the deformation cavity 22, the wall surface of the plug rod 20 is fixedly provided with a plurality of protruding blocks 23, the wall surface of the plug rod 20 is further provided with a plurality of stepped grooves 21, the plug rod 20 is clamped with the core column 13 through the protruding blocks 23, the core column 13 forms a cylindrical structure, the circumferential surface of the core column 13 is provided with a plurality of insertion grooves 14, the plug rod 20 is inserted into the corresponding insertion groove 14, the plug rod 20 is a cylindrical structure, the insertion groove 14 is an arc-shaped slot in horizontal section, the plug rod 20 is in interference fit with the insertion groove 14, the plug rod 20 is in the same height with the insertion groove 14, the deformation cavity 22 is a circular through hole, the stepped groove 21 is provided on the outer circumferential surface of the plug rod 20, the stepped groove 21 forms a fan-shaped slot in horizontal section, the depth of the stepped groove 21 is smaller than the wall thickness of the plug rod 20, there is a space between the adjacent two stepped grooves 21, specifically, the number of the insertion grooves 14 is equal to the number of the plug rods 20, the number of the plug rods 20 is taken as an example, the plug rod 20 is made of high-temperature-resistant rubber material, and the specific components are not limited here, the installation of the plug rod 20 is realized by inserting the plug rod 20 into the insertion groove 14, when the metal ring is sleeved outside the core column 13, the metal ring can extrude the plug rod 20 to deform, through the deformation cavity 22, the deformation amplitude of the plug rod 20 can be increased, the height of the deformation cavity 22 needs to be smaller than the height of the plug rod 20, the two ends of the plug rod 20 are sealed, that is, the deformation cavity 22 forms an air storage cavity, after the metal ring is sleeved outside the core column 13, the metal ring can tightly press the plug rod 20, the metal ring can be in the same height with the core column 13 or smaller than the height of the core column 13, in this scheme, the height of the metal ring is taken as an example, through the stepped groove 21, the wall surface of the plug rod 20 near the upper end and the lower end of the metal ring can deform to form a boss towards the deformation cavity 22, thereby providing radial limiting for the metal ring, the metal ring remains in a suspended state during the injection molding process, for limiting the metal ring with a height smaller than the core column 13, it has better fixing effect and can adjust the position of the metal ring, the inner circumference of the metal ring is supported by the plurality of plug rods 20, which can ensure that the metal ring is concentric with the core column 13 and ensure the quality of the formed product, the plug rod 20 can be replaced in time after wear, which is convenient for later maintenance and repair.

[0029] As Figure 5 and Figure 6 shown, the protruding block 23 is fixedly arranged on the outer circumferential surface of the insertion rod 20, the protruding block 23 forms a fan-shaped block structure, the circumferential length of the protruding block 23 is less than half of the circumferential length of the insertion rod 20, the protruding block 23 is located on the opposite side of the stepped groove 21, the inner wall surface of the core column 13 is provided with a plurality of anti-extraction grooves 15, the anti-extraction grooves 15 are used in cooperation with the protruding block 23, the protruding block 23 is clamped into the corresponding anti-extraction groove 15 to limit the radial sliding of the insertion rod 20, as a supplementary description of the above scheme, by arranging the protruding block 23, when the insertion rod 20 is inserted into the insertion slot 14, the protruding block 23 can be clamped into the anti-extraction groove 15 to limit the radial sliding of the insertion rod 20, and the anti-extraction effect of the insertion rod 20 is better, when the insertion rod 20 is installed, the insertion rod 20 can be squeezed into the insertion slot 14 from the side of the core column 13, or the insertion rod 20 can be inserted from the top of the insertion slot 14, and the stability of the insertion rod 20 after installation is higher, and the insertion rod 20 is not easy to fall off during demolding.

[0030] The working principle of the utility model is: the insertion rod 20 is inserted into the insertion slot 14 to realize the installation of the insertion rod 20, when the insertion rod 20 is inserted into the insertion slot 14, the protruding block 23 can be clamped into the anti-extraction groove 15 to limit the radial sliding of the insertion rod 20, and the anti-extraction effect of the insertion rod 20 is better, when the insertion rod 20 is installed, the insertion rod 20 can be squeezed into the insertion slot 14 from the side of the core column 13, or the insertion rod 20 can be inserted from the top of the insertion slot 14, and the stability of the insertion rod 20 after installation is higher, and the insertion rod 20 is not easy to fall off during demolding.

[0031] The basic principle and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A core shaft structure for positioning a metal ring, characterized in that: include: A lower mold body (10) and an upper mold body (11) are used in conjunction with each other, wherein an injection tube is fixedly provided on the top of the upper mold body (11), a molding cavity (12) for injection is provided on the top of the lower mold body (10), and an integrally molded core column (13) is provided on the inner bottom surface of the lower mold body (10); A limiting assembly is detachably arranged on the wall surface of a core column (13) for limiting a metal ring. The limiting assembly comprises an insert rod (20), a step groove (21), a deformation cavity (22) and a protrusion (23). The deformation cavity (22) is provided inside the insert rod (20). A plurality of protrusions (23) are fixedly installed on the wall surface of the insert rod (20). A plurality of step grooves (21) are also provided on the wall surface of the insert rod (20). The insert rod (20) is clamped with the core column (13) through the protrusion (23).

2. The core shaft structure for positioning the metal ring according to claim 1, characterized in that: The core column (13) forms a cylindrical structure, and a plurality of slots (14) are provided on the circumferential surface of the core column (13), and the insertion rod (20) is inserted into the corresponding slots (14).

3. The core shaft structure for positioning the metal ring according to claim 2, characterized in that: The insertion rod (20) is a cylindrical structure, the slot (14) is a slot with an arched horizontal cross section, the insertion rod (20) and the slot (14) are interference fit, and the insertion rod (20) and the slot (14) are at the same height.

4. The core shaft structure for positioning the metal ring according to claim 1, characterized in that: The deformation cavity (22) is a circular through hole, and the step groove (21) is provided on the outer circumferential surface of the insertion rod (20).

5. The core shaft structure for positioning the metal ring according to claim 1, characterized in that: The step groove (21) forms a notch with a fan-shaped horizontal cross section. The depth of the step groove (21) is less than the wall thickness of the insertion rod (20), and a gap is left between two adjacent step grooves (21).

6. The core shaft structure for positioning the metal ring according to claim 1, characterized in that: The protrusion (23) is fixedly arranged on the outer circumferential surface of the insertion rod (20), and the protrusion (23) forms a fan-shaped block structure. The circumferential length of the protrusion (23) is less than half the circumferential length of the insertion rod (20), and the protrusion (23) is located on the opposite side of the step groove (21).

7. The core shaft structure for positioning the metal ring according to claim 1, characterized in that: The inner wall surface of the core column (13) located in the slot (14) is provided with a plurality of anti-slip grooves (15), and the anti-slip grooves (15) and the protrusions (23) are used in conjunction with each other, and the protrusions (23) are snapped into the corresponding anti-slip grooves (15) to limit the radial sliding of the insertion rod (20).

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