CN219028288U - Injection molding die based on floating roof block - Google Patents

Abstract

The utility model relates to an injection molding die based on a floating ejector block, which comprises a front die, a rear die, an annular floating ejector block movably arranged on the rear die, a plurality of transmission rods, ejector plates and driving parts, wherein one ends of the transmission rods are connected with the annular floating ejector block, the other ends of the transmission rods extend out of the rear die, the ejector plates are connected with the extending ends of the transmission rods, and the driving parts are in transmission connection with the ejector plates; the annular floating ejector block is wound outside the core of the rear die and can be abutted against the parting surface of the front die under the pushing action of the driving piece. Compared with the prior art, the floating roof block structure reduces the weight of the mold sealing mechanism, avoids the problem of clamping stagnation during mold operation, reduces the product area on the floating structure, reduces the stress problem of the floating structure during filling, and solves the problem of product flash.

Description

Injection molding die based on floating roof block

Technical Field

The utility model belongs to the technical field of injection molds, and relates to an injection molding mold based on a floating roof block.

Background

With the rising of the electric automobile industry, in order to meet the requirements of customers on the appearance, the shape and the functions of exterior products, the automobile grille products are increasingly made of transparent materials such as PC, and the like, breakthroughs are made in the shape, and a plurality of irregular wall thickness modeling textures are designed. In order to avoid thick-wall shrinkage marks, reduce residual stress and improve deformation problems of products, injection compression molding technology is generally selected to manufacture the products.

The existing mold is realized by two modes of inserting through a sealing glue injection mold and a floating push plate injection mold, which are respectively shown in fig. 1 and 2. The insert-through sealing glue injection mold realizes micro-opening injection molding of the mold through sealing glue at a parting surface of 0 degree or a small angle, but the sealing glue mode is only suitable for small molds due to the problems of high-temperature expansion and the like, and the phenomenon of die collision and strain of large molds can occur. The floating push plate injection mold drives the floating push plate 10 through the driving piece 6 (oil cylinder), seals the molding surface of the cavity, has heavy push plate weight, needs large driving force, needs to bear large injection pressure with the molding surface sealing glue of the cavity, and easily causes the problems of clamping stagnation and sealing the flash of the glue product in the mold production process.

Disclosure of Invention

The utility model aims to provide an injection molding die based on a floating ejector block, which is used for solving the problems of die operation clamping stagnation and driving force product flash caused by insufficient sealing force.

The aim of the utility model can be achieved by the following technical scheme:

an injection molding die based on a floating ejector block comprises a front die, a rear die, an annular floating ejector block movably arranged on the rear die, a plurality of transmission rods, ejector plates and driving pieces, wherein one ends of the transmission rods are connected with the annular floating ejector block, the other ends of the transmission rods extend out of the rear die, the ejector plates are connected with the extending ends of the transmission rods, and the driving pieces are in transmission connection with the ejector plates;

the annular floating ejector block is wound outside the core of the rear die and can be abutted against the parting surface of the front die under the pushing action of the driving piece.

Further, the front die comprises a front die frame and a front die core arranged in the front die frame, and the rear die comprises a rear die frame and a rear die core arranged in the rear die frame;

the annular floating ejector block is wound outside the rear die core, is movably embedded between the rear die frame and the rear die core and can be abutted against the parting surface positioned at the outer edge of the front die core.

Further, a plurality of assembly grooves are radially arranged on the abutting surface of the annular floating ejector block, which abuts against the parting surface, at intervals, and a buckle forming part is arranged in the assembly grooves in a sliding manner; the plurality of buckle forming pieces are circumferentially arranged outside the rear mold core.

Further, inwards along the radiation direction, the inner edge of the top of the buckle molding part extends out of the assembly groove, and a buckle molding groove for molding a buckle on the injection molding product is formed;

along the radiation direction, the buckle shaping piece on from the front mould to the back mould, from inside to outside offered oblique guide hole, the front mould benevolence on be equipped with oblique guide pillar of oblique guide hole looks adaptation to make when front mould and back mould compound die, oblique guide pillar insert in the oblique guide hole, buckle shaping groove and back mould benevolence outer fringe butt.

Further, along the radiation direction, the outer edge of the buckle molding piece is an inclined surface which is matched with the inclined direction of the inclined guide hole; the outer edge of the abutting surface of the front die core is provided with a boss, and the inner edge of the boss is matched with the inclined surface.

Further, along the radiation direction, a reset spring groove for accommodating a reset spring is formed in the side wall of the inner edge of the bottom of the buckle molding piece, and two ends of the reset spring are respectively connected with the reset spring groove and the inner edge of the assembly groove along the radiation direction.

Further, wear plates in sliding contact with the rear mold frame are embedded on the outer side wall of the annular floating roof block.

Further, the wear-resistant sheet is an alumina ceramic sheet.

Further, the matching surface between the inner side wall of the annular floating top block and the rear mold core is an inclined surface from front to back and from inside to outside.

Further, the inclined surface has an angle of 0.5-2 DEG, preferably an inclination angle of 1 DEG, with respect to the moving direction of the annular floating roof block.

Further, the transmission rod is connected with the thimble plate through bolts.

Further, the driving piece is a driving oil cylinder.

Compared with the prior art, the utility model has the following characteristics:

1) The utility model reduces the weight of the mold sealing mechanism by using the floating top block structure, avoids the problem of mold operation clamping stagnation, reduces the product area on the floating structure, reduces the stress problem of the floating structure during filling, and solves the problem of product flash;

2) The utility model designs the matching surface between the inner side wall of the annular floating top block and the rear mould core as an inclined surface from front to back and from inside to outside. The included angle of the inclined plane relative to the moving direction of the annular floating roof block is designed to be 0.5-2 degrees, so that zero-degree insertion abrasion during the operation of the annular floating roof block is effectively avoided;

3) The wear-resisting piece which is in sliding contact with the rear mold frame is embedded on the outer side wall of the annular floating ejector block, so that the situation that the annular floating ejector block is worn can be avoided, and the clearance between the annular floating ejector block and the rear mold core can be adjusted by adjusting the thickness of the thickened wear-resisting piece in advance, so that the problems of flash and leakage caused by too large clearance between the annular floating ejector block and the rear mold core when the mold is slightly opened are avoided.

Drawings

FIG. 1 is a schematic diagram of a structure of an insert molding die;

FIG. 2 is a schematic diagram of a floating-pusher injection mold;

fig. 3 and 10 are schematic structural diagrams of an injection molding mold based on a floating roof block according to an embodiment;

FIG. 4 is a schematic view of the assembly of an annular floating roof block with a front mold;

FIG. 5 is a schematic view of the structure of an annular floating roof block;

FIG. 6 is a schematic view of the structure of the front mold;

FIG. 7 is a schematic view of the structure of an automotive grille product;

FIG. 8 is a section A-A of FIG. 7;

FIG. 9 is an enlarged view of part B of FIG. 8;

FIG. 11 is an enlarged view of a portion C of FIG. 10;

the figure indicates:

1-front mould, 101-front mould frame, 102-front mould core, 2-rear mould, 201-rear mould frame, 202-rear mould core, 3-annular floating ejector block, 4-transmission rod, 5-ejector pin plate, 6-driving piece, 7-assembly groove, 8-buckle forming piece, 9-wear pad, 10-floating push plate, 11-oblique guide pillar, 12-oblique guide pillar fixing piece and 13-reset spring.

Detailed Description

The utility model will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present utility model, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present utility model is not limited to the following examples.

Examples:

an injection molding die based on floating ejector blocks shown in fig. 3 and 10 is used for producing an automobile grid product shown in fig. 7-9, and comprises a front die 1, a rear die 2, an annular floating ejector block 3 movably arranged on the rear die 2, a plurality of transmission rods 4, an ejector plate 5 and a driving piece 6, wherein one ends of the transmission rods 4 are connected with the annular floating ejector block 3, the other ends of the transmission rods extend out of the rear die 2, and the ejector plate 5 is in bolt connection with the extending ends of the transmission rods 4.

Specifically, the driving member 6 is a driving cylinder. The front mould 1 comprises a front mould frame 101 and a front mould core 102 arranged in the front mould frame 101; as shown in fig. 6, the rear mold 2 includes a rear mold frame 201 and a rear mold core 202 disposed in the rear mold frame 201; the annular floating ejector block 3 is wound outside the rear mold core 202 and is movably embedded between the rear mold frame 201 and the rear mold core 202, and can be abutted against a parting surface positioned at the outer edge of the front mold core 102 under the pushing action of the driving piece 6.

As shown in fig. 4 and 5, a plurality of radially arranged assembly grooves 7 are arranged on the abutting surface of the annular floating roof block 3 abutting against the parting surface at intervals, and a buckle forming piece 8 is arranged in the assembly grooves 7 in a sliding manner; the plurality of buckle molded parts 8 are circumferentially arranged outside the rear mold core 202. As shown in fig. 11, the inner edge of the top of the buckle molding member 8 extends out of the assembly groove 7 inward along the radiation direction, and is provided with a buckle molding groove for molding a buckle on the injection-molded product; meanwhile, in the radiation direction, oblique guide holes are formed in the buckle forming part 8 from the front die 1 to the rear die 2 and from inside to outside, oblique guide posts 11 matched with the oblique guide holes are arranged on the front die core 102 and are fixed through the oblique guide post fixing parts 12, so that when the front die 1 and the rear die 2 are assembled, the oblique guide posts 11 are inserted into the oblique guide holes, and the buckle forming grooves are abutted against the outer edges of the rear die core 202. Wherein the inclined guide pillar fixing piece 12 can be a bolt or the like.

The outer edge of the buckle forming piece 8 is an inclined surface which is matched with the inclined direction of the inclined guide hole; the outer edge of the abutting surface of the front mold core 102 is provided with a boss, and the inner edge of the boss is matched with the inclined surface. The inclined surface and the boss are matched with each other to assist the buckle forming part 8 to move towards the rear die core 202 in the die assembly process.

In order to facilitate smooth taking out of the molded product, a return spring groove for accommodating the return spring 13 is formed in the side wall of the inner edge of the bottom of the buckle molding piece 8, and two ends of the return spring 13 are respectively connected with the return spring groove and the inner edge of the assembly groove 7 along the radiation direction. In the process of die sinking, the elastic reset action of the reset spring 13 drives the buckle forming piece 8 to outwards withdraw from the product back-off, so that the product buckle structure is die-sinking. Meanwhile, in the die opening state, the reset spring 13 also plays a limiting role on the buckle forming piece 8, so that the problem of die closing and die collision is avoided.

The wear pad 9 is fitted to the outer wall of the annular floating head 3 in sliding contact with the rear mold frame 201. Specifically, the wear-resistant sheet 9 is an alumina ceramic sheet. Through this wear pad 9, on the one hand can play the circumstances that avoids cyclic annular floating roof piece 3 wearing and tearing, on the other hand then accessible pre-adjustment thickening wear pad thickness to adjust cyclic annular floating roof piece 3 and back mould benevolence 202 clearance, avoid appearing overlap and leakage problem because of mould slight opening cyclic annular floating roof piece 3 and back mould benevolence 202 clearance is too big.

Similarly, corresponding wear-resisting pieces 9 are arranged between the bottom of the buckle forming piece 8 and the bottom of the assembly groove 7 and between the outer edge inclined surface of the buckle forming piece 8 and the outer edge boss of the abutting surface of the front die core 102, and frequent sliding abrasion is avoided through the wear-resisting pieces 9, so that the service life is ensured.

The matching surface between the inner side wall of the annular floating roof block 3 and the rear mold core 202 is an inclined surface from front to back and from inside to outside. The inclined surface forms an angle of 1 ° with respect to the moving direction of the annular slider 3. By the design of the 1-degree inclination angle, zero-degree insertion abrasion of the annular floating roof block 3 during operation is avoided.

In order to ensure that the annular floating roof block 3 can resist injection pressure to ensure the sealing effect in the injection molding process, the driving force of the driving oil cylinder is required to be more than or equal to the injection pressure, namely:

the projection area of the product is multiplied by the injection pressure which is less than or equal to the ejection force of the oil cylinder and is multiplied by the number of the oil cylinders;

wherein, product projection area: projection areas of all glue position surfaces on the annular floating roof block 3; oil cylinder ejection force: single ram ejection force, for example: the ejection force of the oil cylinder with the cylinder diameter of 80mm is 5T when the oil pressure of the machine platform is 100bar (the upper limit is 140 bar).

The production flow of the injection molding die is as follows:

the method comprises the steps of firstly driving an annular floating ejector block 3 to retract into a rear mold 2 through a driving oil cylinder, closing a front mold 1 and the rear mold 2, slightly opening a parting surface of the mold by 2mm, pushing the annular floating ejector block 3 out to be abutted against the parting surface at the outer edge of a front mold core 102 through the driving oil cylinder, sealing glue, then performing injection molding through a nozzle of the mold 2, compressing and maintaining the mold until a cooling stage is completed, finally releasing pressure through the driving oil cylinder, retracting the annular floating ejector block 3, opening the mold, ejecting an injection molded product, and taking out a piece to manufacture the next injection molded product.

The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present utility model. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present utility model is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present utility model.

Claims (10)

1. The injection molding die based on the floating ejector block is characterized by comprising a front die (1) and a rear die (2), an annular floating ejector block (3) movably arranged on the rear die (2), a plurality of transmission rods (4) with one ends connected with the annular floating ejector block (3) and the other ends extending out of the rear die (2), ejector plates (5) connected with the extending ends of the transmission rods (4), and driving parts (6) in transmission connection with the ejector plates (5);

the annular floating ejector block (3) is wound outside the core of the rear die (2) and can be abutted against the parting surface of the front die (1) under the pushing action of the driving piece (6).

2. The injection molding die based on the floating roof block according to claim 1, wherein the front die (1) comprises a front die frame (101) and a front die core (102) arranged in the front die frame (101), and the rear die (2) comprises a rear die frame (201) and a rear die core (202) arranged in the rear die frame (201);

the annular floating ejector block (3) is wound outside the rear die core (202) and is movably embedded between the rear die frame (201) and the rear die core (202), and can be abutted against a parting surface positioned at the outer edge of the front die core (102).

3. The injection molding die based on the floating roof block according to claim 2, characterized in that a plurality of assembly grooves (7) are radially arranged on the abutting surface of the annular floating roof block (3) abutting against the parting surface at intervals, and a buckle molding piece (8) is arranged in the assembly grooves (7) in a sliding manner; the plurality of buckle forming pieces (8) are circumferentially arranged outside the rear die core (202).

4. A floating roof block-based injection molding die according to claim 3, wherein the inner edge of the top of the snap molding member (8) extends out of the assembly groove (7) along the radial direction inwards, and is provided with a snap molding groove for molding a snap on an injection product;

along the radiation direction, buckle shaping spare (8) on by preceding mould (1) to back mould (2), from interior to having seted up oblique guide hole outward, preceding mould benevolence (102) on be equipped with oblique guide pillar (11) of oblique guide hole looks adaptation to when making preceding mould (1) and back mould (2) compound die, oblique guide pillar (11) insert in the oblique guide hole, buckle shaping groove and back mould benevolence (202) outer fringe looks butt.

5. The floating roof block-based injection molding die according to claim 4, wherein the outer edge of the buckle molding member (8) is an inclined surface adapted to the inclined direction of the inclined guide hole along the radiation direction; the outer edge of the abutting surface of the front die core (102) is provided with a boss, and the inner edge of the boss is matched with the inclined surface.

6. The injection molding die based on the floating roof block according to claim 4, wherein a return spring groove for accommodating a return spring (13) is formed in the side wall of the inner edge of the bottom of the buckle molding piece (8) along the radiation direction, and two ends of the return spring (13) are respectively connected with the return spring groove and the inner edge of the assembly groove (7) along the radiation direction.

7. The injection molding die based on the floating roof block according to claim 2, wherein the wear pad (9) which is in sliding contact with the rear mold frame (201) is embedded on the outer side wall of the annular floating roof block (3).

8. The injection molding die based on the floating roof block according to claim 7, wherein the matching surface between the inner side wall of the annular floating roof block (3) and the rear die core (202) is an inclined surface from front to back and from inside to outside.

9. The floating roof block-based injection molding die as claimed in claim 8, wherein the inclined surface has an angle of 0.5-2 ° with respect to the moving direction of the annular floating roof block (3).

10. A floating roof block based injection molding die according to claim 3, wherein the driving member (6) is a driving cylinder.

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