Injection mold for special structure sheet metal overmolding

Abstract

The present application relates to a kind of injection mould of special structure sheet metal overmolding, including upper module and lower module, upper module and lower module are equipped with upper mould and lower mould respectively, also include left core-pulling, right core-pulling and front core-pulling, lower module is equipped with sheet metal installation part, and front core-pulling includes front core seat, front core slider and elastic reset structure;When moulding injection, sheet metal part is installed on sheet metal installation part, and left foot bottom plate and right foot bottom plate are all pressed on the upper surface of lower mould one part, left core-pulling, right core-pulling and front core seat are all located in respective working position, and the front mould one part of front core seat is inserted between left foot structure and right foot structure, the front mould two parts of front core slider are pressed on the upper surface of left foot bottom plate and right foot bottom plate, upper mould, lower mould, front mould one part, front mould two parts and left core-pulling form left injection cavity for injecting left plastic body, upper mould, lower mould, front mould one part, front mould two parts and right core-pulling form right injection cavity for injecting right plastic body.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of injection mold, in particular to a special structure sheet metal over-molding injection mold. BACKGROUND

[0002] In the automotive parts, various types of sheet metal over-molding products are used, which are over-molded on sheet metal parts, as shown in the attached drawings. Figure 1 and the attached drawings. Figure 2 The special structure sheet metal over-molding product 1 includes a sheet metal part 11, a left plastic body 12 and a right plastic body 13. The left and right sides of the front end of the sheet metal part 11 are respectively provided with oppositely arranged left foot structure 112 and right foot structure 111. The left foot structure 112 and the right foot structure 111 are outside the radius main body 113. The right foot structure 111 includes a right side plate 111b, a right inclined plate 111c located at the upper end of the right side plate 111b, and a right foot bottom plate 111a at the lower end of the right side plate 111b. The right side plate 111b is connected with the radius main body 113. The right inclined plate 111c and the right foot bottom plate 111a are both bent and extended towards the inside of the sheet metal part 11 relative to the right side plate 111b, that is, they are both located on the left side of the right side plate 111b. The left foot structure 112 includes a left side plate 112b and a left foot bottom plate 112a at the lower end of the left side plate 112b. The left side plate 112b is connected with the radius main body 113. The left foot bottom plate 112a is bent and extended towards the inside of the sheet metal part 11 relative to the left side plate 112b. The left plastic body 12 needs to be over-molded on the left side plate 112b of the left foot structure 112. The right plastic body 13 needs to be over-molded on the right inclined plate 111c and the right side plate 111b of the right foot structure 111.

[0003] For the above-mentioned sheet metal plastic coated product 1, the sheet metal part 11 has a special shape. Due to the existence of the left foot structure 112 and the right foot structure 111, in addition to the mold structure on the upper and lower left and right sides of the front end of the sheet metal, the mold structure between the left foot structure 112 and the right foot structure 111 is also needed. It is difficult to achieve with a conventional mold, and the mold cannot be a simple two-plate mold. Moreover, during injection molding, the left foot bottom plate 112a and the right foot bottom plate 111a do not need to be coated with plastic, so the four corners of the left foot bottom plate 112a and the right foot bottom plate 111a need to be pressed by the sealing glue part. In order to ensure that the injection molding edge does not leak glue, the gap between the sealing glue part pressed on the left foot bottom plate 112a and the right foot bottom plate 111a and the left foot bottom plate 112a and the right foot bottom plate 111a cannot be greater than 0.02mm, and the thickness of the sheet metal part 11 is normally within a tolerance of ±0.05mm. Because the thickness of each batch of sheet metal parts 11 is different, the hardness is also different, and during the processing of the sheet metal part 11, the left foot bottom plate 112a and the right foot bottom plate 111a will have different rebounds after bending, causing the flatness of the left foot bottom plate 112a and the right foot bottom plate 111a to be different. The gap of the sealing glue part of the over-molding injection molding is required to be ≤0.02mm, but the thickness tolerance and flatness of the sheet metal material are beyond this requirement. If the injection mold is designed to enter from the side to the top of the left foot bottom plate 112a and the right foot bottom plate 111a, and the gap between the left foot bottom plate 112a and the right foot bottom plate 111a during injection molding is kept at 0.02mm, the mold will be easily damaged during mold testing, and the sheet metal part 11 will be damaged. If the gap is set according to the maximum deviation of the thickness tolerance and the flatness, there will be a lot of burrs at the injection molding edge of the product, the injection molding quality is poor, and a lot of manpower is needed for subsequent trimming. SUMMARY

[0004] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present application is to provide an injection mold for over-molding of sheet metal with a special structure, which can facilitate injection molding on the left foot structure and the right foot structure of the sheet metal part, ensure the quality of injection molding, and avoid damage to the mold and the sheet metal part.

[0005] In order to achieve the above object, the present application provides a special structure injection mold for sheet metal over-molding, which is used for over-molding left plastic body and right plastic body on left foot structure and right foot structure of a sheet metal part, and comprises an upper mold block and a lower mold block, wherein the upper mold block is provided with an upper mold core, the lower mold block is provided with a lower mold core, and further comprises a left core-pulling mechanism, a right core-pulling mechanism and a front core-pulling mechanism; the lower mold block is provided with a sheet metal mounting portion; the lower mold core comprises a first lower mold core; the left core-pulling mechanism and the right core-pulling mechanism are arranged on the lower mold block and are respectively located on the left side and the right side of the first lower mold core; the left core-pulling mechanism and the right core-pulling mechanism can move to or away from the working position in the left-right direction; the front core-pulling mechanism comprises a front core seat, a front core slider and an elastic reset structure; the front core seat is arranged on the front side of the first lower mold core and is provided with a first front mold core at the rear end thereof; the front core slider is provided with a pressure receiving surface and is provided with a second front mold core at the rear end thereof; the front core slider is mounted in the front core seat and can move in the rear and downward direction in the front core seat when the pressure receiving surface is subjected to pressure; the elastic reset structure is arranged between the front core slider and the front core seat and provides reset elastic force for driving the front core slider to move in the upward and forward direction; the front core seat can move to or away from the working position in the front and rear direction; when the mold is closed and injection is performed, the sheet metal part is mounted on the sheet metal mounting portion, the left foot bottom plate of the left foot structure and the right foot bottom plate of the right foot structure are pressed against the upper surface of the first lower mold core, the left core-pulling mechanism, the right core-pulling mechanism and the front core seat are located at the respective working positions, the first front mold core of the front core seat extends into the space between the left foot structure and the right foot structure, the pressure receiving surface of the front core slider is subjected to pressure and moves rearward to press the second front mold core against the upper surfaces of the left foot bottom plate and the right foot bottom plate, the upper mold core, the lower mold core, the first front mold core, the second front mold core and the left core-pulling mechanism form a left injection cavity for over-molding the left plastic body, and the upper mold core, the lower mold core, the first front mold core, the second front mold core and the right core-pulling mechanism form a right injection cavity for over-molding the right plastic body.

[0006] Further, the front core seat of the front core-pulling mechanism is provided with a guide slide, which is arranged in an inclined manner with the front side being higher than the rear side.

[0007] Further, the lower end surface of the first front mold core of the front core seat is parallel and flush with the upper wall surface of the guide slide, and the upper surface of the second front mold core of the front core slider is in contact with the lower end surface of the first front mold core.

[0008] Further, the elastic reset structure of the front core-pulling mechanism comprises a reset spring, which is arranged in the front core seat and is contacted by the front core slider when the front core slider moves rearward.

[0009] Further, the front core-pulling mechanism further comprises a positioning baffle mounted on the front core seat, and the front core slider is provided with a positioning groove, wherein the positioning baffle extends into the positioning groove, and the front core slider moves rearward to abut against the front side wall of the positioning groove during mold closing and injection.

[0010] Further, the lower die core further comprises a second lower die core part located at the back side of the first lower die core part, and the second lower die core part is located between the left foot structure and the right foot structure during the mold clamping and injection molding, and is used to form the back side of the left injection cavity and the right injection cavity.

[0011] Further, the upper surface of the first lower die core part is provided with a positioning protrusion, and the left foot bottom plate and the right foot bottom plate are respectively located at the left side and the right side of the positioning protrusion during the mold clamping and injection molding.

[0012] Further, the upper die block is further provided with a pressing block, and the pressing block is located above the metal plate mounting part, and the pressing block is pressed on the metal plate during the mold clamping and injection molding.

[0013] Further, the front core driving mechanism comprises an oil cylinder, and the oil cylinder is fixed with the lower die block, and the piston rod of the oil cylinder is fixedly connected with the front core seat.

[0014] Further, the front core driving mechanism comprises an oil cylinder, and the oil cylinder is fixed with the lower die block, and the piston rod of the oil cylinder is fixedly connected with the front core seat.

[0015] As described above, the injection mold involved in the present application has the following beneficial effects:

[0016] By setting the left core, the right core and the front core, the front core is inserted between the left foot structure and the right foot structure of the metal plate with a special structure from the front side, and the front core is inserted between the left foot structure and the right foot structure and the left foot bottom plate and the right foot bottom plate are pressed tightly by setting the front core slider, so that the left foot bottom plate and the right foot bottom plate are pressed tightly and fitted on the upper surface of the first lower die core part, and the left foot bottom plate and the right foot bottom plate will not cause damage to the mold and the metal plate due to the thickness size and the flatness difference of the left foot bottom plate and the right foot bottom plate, and the mold can be tightly contacted with the left foot bottom plate and the right foot bottom plate, so that the gap of the sealing glue is less than the required value, and the molten material can be effectively prevented from entering the gap during injection molding to form a large burr, and the injection molding problem caused by the thickness of the metal plate and the flatness difference of the left foot bottom plate and the right foot bottom plate due to bending can be overcome, the injection molding operation is convenient, the work efficiency is high, the injection molding quality can be guaranteed, and the mold is not easy to be damaged. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure diagram of the metal plastic packaging product produced by the injection mold.

[0018] Figure 2 The structure diagram of the left foot structure and the right foot structure on the metal plate.

[0019] Figure 3 Working schematic diagram of the injection mold of the present application when clamping and injecting.

[0020] Figure 4 Structural schematic diagram of the lower mold block and the lower mold core thereon in the present application.

[0021] Figure 5 Working schematic diagram of the installation of sheet metal parts on the lower mold block in the present application.

[0022] Figure 6 Working schematic diagram of the front core-pulling, left core-pulling and right core-pulling in the present application when in working position.

[0023] Figure 7 Working schematic diagram of the injection mold of the present application after injection to obtain left and right plastic bodies.

[0024] Figure 8 Structural schematic diagram of the upper mold block in the present application.

[0025] Figure 9 Structural schematic diagram of the upper mold block and the upper mold core thereon in the present application.

[0026] Figure 10 Working schematic diagram of the upper movable insert of the injection mold of the present application when clamping and injecting.

[0027] Figure 11 Structural schematic diagram of the front core-pulling in the present application.

[0028] Figure 12 Structural schematic diagram of the front core-pulling in the present application.

[0029] Figure 13 Half sectional view of the front core-pulling in the present application.

[0030] Figure 14 Schematic diagram of the front core slider of the front core-pulling in the present application in initial position.

[0031] Figure 15 Overall appearance schematic diagram of the injection mold of the present application.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 1 sheet metal plastic-encased product

[0034] 11 sheet metal part

[0035] 111 right leg structure

[0036] 111a right leg bottom plate

[0037] 111b right side plate

[0038] 111c right inclined plate

[0039] 112 Left foot structure

[0040] 112a Left foot sole

[0041] 112b Left side panel

[0042] 113 Sheet metal body

[0043] 114 gaps

[0044] 12 Left-handed body

[0045] 13 Right-handed body

[0046] 2. Module

[0047] 21 Sheet Metal Assembly Department

[0048] 3. Lower mold core

[0049] 31 Lower Model One

[0050] 32 Lower mold core part two

[0051] 33 Positioning protrusions

[0052] 4. Left-side core extraction

[0053] 5. Right-side core extraction

[0054] 6. Front core pull

[0055] 61 Front Core

[0056] 61a Former Model Part 1

[0057] 61b Guide slide

[0058] 62 Front Core Slider

[0059] 62a Front Model Part Two

[0060] 62b Pressure surface

[0061] 62c positioning groove

[0062] 62d clearance groove

[0063] 63. Return spring

[0064] 64 Positioning baffle

[0065] 7. Upper Module

[0066] 71 Upper Model

[0067] 71a Upper Model Part One

[0068] 71b Upper Model Part Two

[0069] 72 compacting block

[0070] 73 upper movable insert

[0071] 8 lower die mechanism

[0072] 9 upper die mechanism

[0073] 10 oil cylinder 10 DETAILED DESCRIPTION

[0074] The following illustrates the embodiments of the present application by specific examples, and the skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0075] It should be understood that the structure, proportion, size, etc. shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for the skilled in the art to understand and read, and are not used to limit the defined conditions of the implementation of the present application, so they do not have technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technology disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like used in the specification are only for easy understanding and clear description, and are not used to limit the scope of the implementation of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation scope of the present application.

[0076] Referring to Figures 1 to 15 The present application provides a special structure of a plastic injection mold for covering a metal sheet, which is used for injection molding a left plastic body 12 and a right plastic body 13 on a left leg structure 112 and a right leg structure 111 of a metal sheet 11, referring to Figure 1 and Figure 2 The right leg structure 111 includes a right side plate 111b, a right inclined plate 111c located at the upper end of the right side plate 111b, and a right foot plate 111a at the lower end of the right side plate 111b, and the right plastic body 13 is covered on the right side plate 111b and the right inclined plate 111c. The left leg structure 112 includes a left side plate 112b and a left foot plate 112a at the lower end of the left side plate 112b, and the left plastic body 12 is covered on the left side plate 112b.

[0077] Referring to Figures 3 to 15The injection mold of the present application comprises an upper mold module 7 and a lower mold module 2, the upper mold module 7 is fixed to an upper mold base and constitutes an upper mold mechanism 9 together with other matched structures, the lower mold module 2 is fixed to a lower mold base and constitutes a lower mold mechanism 8 together with other matched structures, the upper mold module 7 and the lower mold module 2 are the main working structures for injection molding, the upper mold module 7 is provided with an upper mold core 71 for forming an injection molding cavity, and the lower mold module 2 is provided with a lower mold core 3 for forming an injection molding cavity.

[0078] The injection mold of the present application is characterized in that it further comprises a left core-pulling mechanism 4, a right core-pulling mechanism 5 and a front core-pulling mechanism 6, the lower mold module 2 is provided with a sheet metal mounting portion 21 for positioning and mounting the sheet metal part 11, the lower mold core 3 comprises a lower mold core first part 31, the left core-pulling mechanism 4 and the right core-pulling mechanism 5 are arranged on the lower mold module 2 and are respectively located on the left and right sides of the lower mold core first part 31, both the left core-pulling mechanism 4 and the right core-pulling mechanism 5 can move in the left-right direction to their working positions or away from the working positions; the front core-pulling mechanism 6 comprises a front core base 61, a front core slider 62 and an elastic return structure, the front core base 61 is arranged on the front side of the lower mold core first part 31 and is provided with a front mold core first part 61a at the rear end thereof, the front core slider 62 is provided with a pressure receiving surface 62b and is provided with a front mold core second part 62a at the rear end, the front core slider 62 is installed in the front core base 61 and can move in the rear-downward direction in the front core base 61 when the pressure receiving surface 62b is pressed, the elastic return structure is arranged between the front core slider 62 and the front core base 61 and provides a return elastic force for driving the front core slider 62 to move in the upward-frontward direction, the front core base 61 can move in the front-rear direction to the working position or away from the working position; during mold clamping and injection molding, the sheet metal part 11 is mounted on the sheet metal mounting portion 21 and the left foot bottom plate 112a of the left foot structure 112 and the right foot bottom plate 111a of the right foot structure 111 are both pressed against the upper surface of the lower mold core first part 31, the left core-pulling mechanism 4, the right core-pulling mechanism 5 and the front core base 61 are all located at their respective working positions and are close to the left foot structure 112 and the right foot structure 111, and the front mold core first part 61a of the front core base 61 extends into the space between the left foot structure 112 and the right foot structure 111, the pressure receiving surface 62b of the front core slider 62 is pressed to move rearward to the front mold core second part 62a which is pressed against the upper surfaces of the left foot bottom plate 112a and the right foot bottom plate 111a, the left injection molding cavity for injecting the left plastic body 12 is formed between the upper mold core 71, the lower mold core 3, the front mold core first part 61a, the front mold core second part 62a and the left core-pulling mechanism 4, and the right injection molding cavity for injecting the right plastic body 13 is formed between the upper mold core 71, the lower mold core 3, the front mold core first part 61a, the front mold core second part 62a and the right core-pulling mechanism 5.

[0079] The basic working principle of the injection mold of the present application is as follows: before injection molding, the front segment of the sheet metal main body 113 of the sheet metal part 11 is mounted on the sheet metal mounting portion 21, as shown in Figure 5At this time, the left foot bottom plate 112a and the right foot bottom plate 111a are both pressed against the lower die core one part 31 upper surface, and are preliminarily positioned, then the left core pulling 4, the right core pulling 5 and the front core pulling 6 are adjusted to be in their respective working positions, see Figure 6 At this time, the left core pulling 4 is close to the left side of the left foot structure 112, the right core pulling 5 is close to the right side of the right foot structure 111, the front die core one part 61a in the front core seat 61 extends into the space between the left foot structure 112 and the right foot structure 111, the front core slider 62 in the front core pulling 6 is in the front side position under the action of the elastic reset structure, the rear end of the front die core two part 62a is between the left foot structure 112 and the right foot structure 111, but above the left foot bottom plate 112a and the right foot bottom plate 111a; then the mold is closed, the upper mold mechanism 9 descends with the injection molding machine, and is close to the lower mold mechanism 8, that is, the upper mold block 7 and the lower mold block 2 are closed, the upper mold mechanism 9 (which can be the upper mold block 7 or other structure) is pressed against the pressure surface 62b of the front core slider 62 to make the front core slider 62 move in the rear and downward direction, and the lower end of the front die core two part 62a is pressed against the left foot bottom plate 112a and the right foot bottom plate 111a, so that the front core pulling 6 can smoothly insert into the space between the left foot structure 112 and the right foot structure 111 and press the left foot bottom plate 112a and the right foot bottom plate 111a tightly during mold closing, and will not cause damage to the mold and the sheet metal part 11 due to the thickness size and flatness difference of the left foot bottom plate 112a and the right foot bottom plate 111a. At the same time, the front die core two part 62a and the lower die core one part 31 can be tightly attached to the left foot bottom plate 112a and the right foot bottom plate 111a, and the lower surface of the left foot bottom plate 112a and the right foot bottom plate 111a can be tightly attached to the upper surface of the lower die core one part 31, ensuring that the gap between the sealing part is less than the required value, effectively avoiding the molten material from entering the left foot bottom plate 112a and the right foot bottom plate 111a to form a large burr during injection molding, and overcoming the injection molding problems caused by the thickness of the sheet metal part 11 and the flatness difference of the left foot bottom plate 112a and the right foot bottom plate 111a due to bending in the prior art. When the mold is closed, the left injection cavity for injecting the left plastic body 12 is formed between the upper die core 71, the lower die core 3, the front die core one part 61a, the front die core two part 62a and the left core pulling 4, the left side plate 112b of the left plastic body 12 needs to be covered in the left injection cavity, and the right injection cavity for injecting the right plastic body 13 is formed between the upper die core 71, the lower die core 3, the front die core one part 61a, the front die core two part 62a and the right core pulling 5, the right side plate 111b and the right inclined plate 11c of the right plastic body 13 need to be covered in the left injection cavity, see Figure 6 The contact surfaces of each mold part at the left injection cavity and the right injection cavity are in close contact, and the gap of the sealing part ensures that no molten material enters. Then injection molding is performed to form the left plastic body 12 and the right plastic body 13 in the left injection cavity and the right injection cavity respectively, and the sheet metal plastic product 1 is obtained, see Figure 7After the injection molding is completed, the upper mold mechanism 9 is gradually separated from the lower mold mechanism 8 along with the upward movement of the injection molding machine, the front core sliding block 62 of the front core-pulling mechanism 6 disappears under the pressure, and moves forward to the second part 62a of the front core pin away from the left foot bottom plate 112a and the right foot bottom plate 111a under the elastic force of the elastic reset structure. After the left core-pulling mechanism 4, the right core-pulling mechanism 5 and the front core-pulling mechanism 6 move away from the respective working positions, the injection molded metal-plastic product 1 can be taken out. The injection mold of the present application can conveniently perform injection molding on the left foot structure 112 and the right foot structure 111, avoid the metal part 11 and the mold from being damaged, and ensure the injection molding quality.

[0080] Referring to Figures 3 to 15 , the present application will be further described below with one specific preferred embodiment:

[0081] In the embodiment, referring to Figure 11 , Figure 12 and Figure 13 , as a preferred design, the front core seat 61 of the front core-pulling mechanism 6 is provided with a guide sliding channel 61b, the guide sliding channel 61b is inclinedly arranged, and the front side is higher than the rear side. The front core sliding block 62 is installed in the guide sliding channel 61b, and the part of the front core sliding block 62 located between the guide sliding channel 61b and the inner wall around the guide sliding channel 61b keeps good adhesion, ensuring the stability of the sliding of the front core sliding block 62. Preferably, the lower side of the first part 61a of the front core pin of the front core seat 61 is parallel and flush with the upper wall of the guide sliding channel 61b, the upper side of the second part 62a of the front core pin of the front core sliding block 62 is in close contact with the lower end surface of the first part 61a of the front core pin, the front core sliding block 62 slides smoothly forward and backward, and when the front core sliding block 62 slides backward to the position, the upper side of the second part 62a of the front core pin is in close contact with the lower side of the first part 61a of the front core pin, ensuring that the gap is very small, and ensuring that the molten material will not enter between the second part 62a of the front core pin and the first part 61a of the front core pin to form burrs when the left injection molding cavity and the right injection molding cavity are injected.

[0082] In the embodiment, referring to Figure 11 , Figure 13 and Figure 14 , as a preferred design, the elastic reset structure of the front core-pulling mechanism 6 includes a reset spring 63, the spring is arranged in a containing hole in the front core seat 61, and the front end is used for abutting against the front core sliding block 62. When the front core sliding block 62 moves backward, the front core sliding block 62 abuts against the reset spring 63. In the embodiment, the pressure surface 62b is arranged on the front side of the front core sliding block 62, and is an inclined bevel surface. The upper mold mechanism 9 applies pressure to the pressure surface 62b in the downward and rear direction.

[0083] In the embodiment, referring to Figure 11 , Figure 12 and Figure 13, as a preferred design, the front core 6 further comprises a positioning baffle 64 installed on the front core seat 61, the positioning baffle 64 keeps fixed in the front-rear direction, the front core slider 62 is provided with a positioning groove 62c, and the positioning baffle 64 extends into the positioning groove 62c, when the mold is closed for injection molding, the front core slider 62 moves backward to the position where the positioning baffle 64 abuts against the front side wall of the positioning groove 62c, as shown in the state of Figure 13 , after the mold is opened, the front core slider 62 resets to the position where the positioning baffle 64 abuts against the rear side wall of the positioning groove 62c, the positioning groove 62c and the positioning baffle 64 realize the positioning of the moving range of the front core slider 62 on the front core seat 61, and ensure that the front core slider 62 can be accurately positioned at the working position when being pressed.

[0084] In the embodiment, as shown in Figure 4 and Figure 5 , the lower die core 3 comprises two parts, a lower die core part 31 and a lower die core part 32, the lower die core part 31 is used for positioning and pressing the left sole plate 112a and the right sole plate 111a, and simultaneously forms the lower side of the left injection cavity and the right injection cavity, the lower die core part 32 is located at the rear side of the lower die core part 31, and is located between the left side plate 112b and the right side plate 111b and closely abuts against the two plates during injection, the lower die core part 32 is used for forming the rear side of the left injection cavity and the right injection cavity, in the embodiment, a through hole is arranged in the lower die block 2, the lower die core part 32 adopts an independent movable insert structure, and is arranged in the through hole and can move up and down to facilitate installation and replacement. The lower die core part 31 is fixed on the upper die block 7.

[0085] In the embodiment, as shown in Figure 4 and Figure 5 , as a preferred design, the upper surface of the lower die core part 31 is provided with a positioning protrusion 33, after the metal part 11 is installed on the metal mounting part 21, when the left core-pulling mechanism 4 and the right core-pulling mechanism 5 abut against the left side plate 112b and the right side plate 111b under the pressing action during mold closing for injection molding, the parts not covered by the plastic body make the left sole plate 112a and the right sole plate 111a abut against the left side and the right side of the positioning protrusion 33 respectively, so as to further realize the positioning of the left sole plate 112a and the right sole plate 111a in the left-right direction. Correspondingly, the lower end surface of the front die core part 62a of the front core slider 62 is provided with an avoiding groove 62d, when the front die core part 62a is pressed on the left sole plate 112a and the right sole plate 111a, the positioning protrusion 33 is located in the avoiding groove 62d.

[0086] In the embodiment, as shown in Figure 8 , Figure 9 and Figure 10As a preferred design, the upper die core 71 mainly comprises an upper die core first part 71a and an upper die core second part 71b, and the upper die core first part 71a is used for forming a left injection cavity and the upper die core second part 71b is used for forming a right injection cavity when the mold is closed. Figure 1 and Figure 2 The sheet metal body 113 of the sheet metal part 11 is substantially an arc-shaped plate in a strip shape, and a gap is formed between the sheet metal body 113 and the right inclined plate 111c. An upper movable insert 73 is arranged on the upper mold block 7, and the upper movable insert 73 is inserted into the gap when the mold is closed. Referring to Figure 10 The right side and the left side of the front side of the upper movable insert 73 form part of the upper die core first part 71a and the upper die core second part 71b, respectively. Preferably, a through hole is arranged on the upper mold block 7, and the upper movable insert 73 is installed in the through hole and can move up and down for installation and replacement.

[0087] In this embodiment, referring to Figure 8 、 Figure 9 and Figure 10 As a preferred design, the upper mold block 7 further comprises a pressing block 72 arranged above the sheet metal mounting part 21 of the lower mold block 2. The pressing block 72 is pressed on the sheet metal part 11 and is attached to the upper surface of the sheet metal part 11 when the mold is closed for injection molding, thereby ensuring the stability of the sheet metal part 11. The pressing block 72 can also be in the form of an insert and can be detachably installed in the upper mold block 7.

[0088] In this embodiment, as a preferred design, the injection mold further comprises a front core-pulling driving mechanism, a left core-pulling driving mechanism (not shown in the drawings) and a right core-pulling driving mechanism (not shown in the drawings). The front core-pulling driving mechanism drives the front core seat 61 to move in the front-rear direction. The left core-pulling driving mechanism drives the left core 4 to move in the left-right direction. The right core-pulling driving mechanism drives the right core 5 to move in the left-right direction. Referring to Figure 15 In this embodiment, the front core-pulling driving mechanism comprises an oil cylinder 10. The oil cylinder 10 is installed in the lower mold mechanism 8 and is fixed to the lower mold block 2. The piston rod of the oil cylinder 10 is fixedly connected to the front core seat 61. The front core-pulling driving mechanism drives the front core 6 to reach its working position before the mold is closed and to leave the working position after the mold is opened, thereby separating from the product. The left core-pulling driving mechanism and the right core-pulling driving mechanism can also adopt an oil cylinder. The oil cylinder drives the left core 4 and the right core 5 to reach their respective working positions before the mold is closed.

[0089] As can be seen from the above, the injection mold of the present application has the following beneficial effects:

[0090] By setting the left core-pulling 4, the right core-pulling 5 and the front core-pulling 6, the front core-pulling 6 is inserted between the left foot structure 112 and the right foot structure 111 of the special structure sheet metal part 11 by the way of inserting from the front side, and the front core-pulling 6 can be smoothly inserted between the left foot structure 112 and the right foot structure 111 and compress the left foot bottom plate 112a and the right foot bottom plate 111a by setting the front core slider 62, and the front core-pulling 6 will not cause the mold and the sheet metal part 11 to be damaged due to the thickness size problem and the flatness difference of the left foot bottom plate 112a and the right foot bottom plate 111a, and can ensure that the mold is in close contact with the left foot bottom plate 112a and the right foot bottom plate 111a around, ensure that the gap of the sealing glue is less than the required value, effectively avoid the molten material from entering the gap to form a larger burr when injection molding, overcome the injection molding problem caused by the material thickness of the sheet metal part 11 and the flatness difference of the left foot bottom plate 112a and the right foot bottom plate 111a due to bending; convenient operation, high work efficiency, can ensure the injection molding quality, and the mold is not easy to be damaged.

[0091] In summary, the present application effectively overcomes the shortcomings of the prior art and has high industrial utilization value.

[0092] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical idea disclosed by the present application should be covered by the claims of the present application.

Claims

1. A special structure of sheet metal overmolding injection mold for injection molding left plastic body (12) and right plastic body (13) on left foot structure (112) and right foot structure (111) of sheet metal part (11), the injection mold comprises an upper mold block (7) and a lower mold block (2), an upper mold core (71) is arranged in the upper mold block (7), and a lower mold core (3) is arranged in the lower mold block (2), characterized in that: The lower mold block (2) is provided with a sheet metal mounting portion (21), the lower mold core (3) comprises a lower mold core first portion (31), the left core-pulling (4) and the right core-pulling (5) are arranged on the lower mold block (2) and are respectively located on the left and right sides of the lower mold core first portion (31), and the left core-pulling (4) and the right core-pulling (5) can move to or away from the working position in the left-right direction; the front core-pulling (6) comprises a front core seat (61), a front core slider (62) and an elastic reset structure, the front core seat (61) is arranged on the front side of the lower mold core first portion (31) and is provided with a front mold core first portion (61a) at the rear end, the front core slider (62) is provided with a pressure receiving surface (62b) and is provided with a front mold core second portion (62a) at the rear end, the front core slider (62) is installed in the front core seat (61) and can move in the rear and downward direction in the front core seat (61) when the pressure receiving surface (62b) is pressed, the elastic reset structure is arranged between the front core slider (62) and the front core seat (61) and provides a reset elastic force for driving the front core slider (62) to move in the upward and forward direction, and the front core seat (61) can move to or away from the working position in the forward and backward direction; when the mold is closed and injection molding is performed, the sheet metal part (11) is mounted on the sheet metal mounting portion (21), the left foot bottom plate (112a) of the left foot structure (112) and the right foot bottom plate (111a) of the right foot structure (111) are pressed against the upper surface of the lower mold core first portion (31), the left core-pulling (4), the right core-pulling (5) and the front core seat (61) are all located at the working position, the front mold core first portion (61a) of the front core seat (61) extends into the space between the left foot structure (112) and the right foot structure (111), the pressure receiving surface (62b) of the front core slider (62) is pressed to move rearward to the front mold core second portion (62a) which is pressed against the upper surfaces of the left foot bottom plate (112a) and the right foot bottom plate (111a), and the left injection molding cavity for injection molding the left plastic body (12) is formed between the upper mold core (71), the lower mold core (3), the front mold core first portion (61a), the front mold core second portion (62a) and the left core-pulling (4), and the right injection molding cavity for injection molding the right plastic body (13) is formed between the upper mold core (71), the lower mold core (3), the front mold core first portion (61a), the front mold core second portion (62a) and the right core-pulling (5).

2. The injection mold of claim 1, wherein: The front core seat (61) of the front core-pulling (6) is provided with a guide slide (61b), the guide slide (61b) is arranged obliquely with the front side being higher than the rear side, and the front core slider (62) is installed in the guide slide (61b).

3. The injection mold of claim 2, wherein: The lower end surface of the front mold core first portion (61a) of the front core seat (61) is parallel and flush with the upper wall surface of the guide slide (61b), and the upper side surface of the front mold core second portion (62a) of the front core slider (62) is attached to the lower end surface of the front mold core first portion (61a).

4. The injection mold of claim 1, wherein: The elastic reset structure of the front core-pulling (6) comprises a reset spring (63), the spring is arranged in the front core seat (61), and the front core slider (62) abuts against the reset spring (63) when moving rearward.

5. The injection mold of claim 1, wherein: The front core-pulling (6) further comprises a positioning baffle (64) installed on the front core seat (61), and the front core slider (62) is provided with a positioning groove (62c), and the positioning baffle (64) extends into the positioning groove (62c), and the front core slider (62) moves backward to abut against the front side wall of the positioning groove (62c) during mold clamping and injection molding.

6. The injection mold of claim 1, wherein: The lower mold block (3) further comprises a lower mold block two part (32) located at the rear side of the lower mold block one part (31), and the lower mold block two part (32) is located between the left foot structure (112) and the right foot structure (111) during mold clamping and injection molding, and the lower mold block two part (32) is used for forming the rear side of the left injection cavity and the right injection cavity.

7. The injection mold of claim 1, wherein: The upper surface of the lower mold block one part (31) is provided with a positioning protrusion (33), and the left foot bottom plate (112a) and the right foot bottom plate (111a) abut against the left side and the right side of the positioning protrusion (33) respectively during mold clamping and injection molding.

8. The injection mold of claim 1, wherein: The upper mold block (7) is further provided with a pressing block (72), and the pressing block (72) is located above the metal plate mounting part (21), and the pressing block (72) is pressed on the metal part (11) during mold clamping and injection molding.

9. The injection mold of claim 1, wherein: Further comprising a front core-pulling driving mechanism, a left core-pulling driving mechanism and a right core-pulling driving mechanism, the front core-pulling driving mechanism drives the front core seat (61) to move in the front-rear direction, the left core-pulling driving mechanism can drive the left core-pulling (4) to move in the left-right direction, and the right core-pulling driving mechanism can drive the right core-pulling (5) to move in the left-right direction.

10. The injection mold of claim 9, wherein: The front core-pulling driving mechanism comprises an oil cylinder (10), and the oil cylinder (10) is fixed with the lower mold block (2), and the piston rod thereof is fixedly connected with the front core seat (61).

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