Multi-layer sleeve core-pulling mechanism of injection mold

Abstract

The utility model relates to the technical field of injection molds, in particular to a multi-layer sleeve core-pulling mechanism of an injection mold, which is used for performing core-pulling and demolding on a product with a multi-layer nested structure, the core-pulling mechanism comprises a nested piece and at least two sliding blocks, the two sliding blocks are arranged in a mirror symmetry manner, the product is arranged between the two sliding blocks, and the nested piece and the sliding blocks are arranged in a staggered manner. The two sliding blocks synchronously approach or leave relative to the product in a sliding manner; the nesting piece is detachably connected with the product, and the separation speed between the nesting piece and the product is higher than the separation speed between the two sliding blocks. Compared with a traditional method, the technical scheme carries out core pulling and mold returning on a product with a multi-layer nested structure, the inner structure of the mold is simplified by reasonably designing core pulling layers and sequences, meanwhile, the mold machining cost is reduced, it is ensured that core pulling of the product is carried out smoothly, and the dual requirements of low cost and the product structure are considered; the important technical problems in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a multi-layer sleeve core pulling mechanism for an injection mold. Background Art

[0002] Mold machinery is a tool used to shape objects. This tool consists of various parts. Different molds are composed of different parts. Mold machinery mainly realizes the processing of the shape of objects by changing the physical state of the molded material. In the forming process of blanking, forming stamping, die forging, cold heading, extrusion, powder metallurgy pressing, pressure casting, and compression or injection molding of engineering plastics, rubber, ceramics and other products, it is a tool used to make the blank into a part with a specific shape and size under the action of external force.

[0003] The patent document with patent announcement number: CN107901355A discloses a multi-angle stacked core pulling mechanism for an injection mold, including a movable mold and a fixed mold. The movable mold is provided with a multi-angle core pulling mechanism, and an upper core pulling slider and a slider guide slide seat are arranged above the multi-angle core pulling mechanism. The upper core pulling slider can slide in the slider guide slide seat, and the slider guide slide seat and the upper oil cylinder are both installed on the movable mold. The multi-angle core pulling mechanism includes a lower oil cylinder, a transmission slider and two lower core pulling sliders. The transmission slider is driven by the lower oil cylinder to slide in the movable mold. The end face of the transmission slider away from the lower oil cylinder is made into a ∧ shape, and guide sliders are fixedly installed on the two inclined surfaces of the ∧-shaped end face of the transmission slider. A guide slide groove is formed on the end face of each lower core pulling slider close to the transmission slider, and a guide slide plate matching the guide slide groove is formed on the guide slide plate. The tops of the two groove walls of the guide slide groove are bent inward to hook the guide slide plate, and the lower oil cylinder is also installed on the movable mold. The utility model can realize core pulling at different angles in the longitudinal direction and the transverse direction, and meets the multi-angle core pulling demand when multiple core pulling mechanisms cannot be arranged due to space limitation.

[0004] The above solution is designed for the core pulling needs of the product from different angles. However, when the product has a multi-layer nested structure, due to the excessive clamping force between the product and the mold, there are cavities between the multi-layer nested structures of the product, and the core pulling product is prone to strain and breakage. Utility Model Content

[0005] In order to overcome the above-mentioned technical problems, the purpose of the utility model is to provide a multi-layer sleeve core pulling mechanism for an injection mold, which solves the problem that products with multi-layer nested structures are easily damaged and have defects when demolding.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] An injection mold multi-layer sleeve core-pulling mechanism is used for core-pulling and demolding of products with a multi-layer nested structure. The core-pulling mechanism includes an inlay kit and sliders. There are at least two sliders, which are symmetrically arranged mirror-image with respect to each other. The product is arranged between the two sliders, and the two sliders can slide synchronously towards or away from the product;

[0008] The inlay kit is detachably connected to the product, and the separation speed between the inlay kit and the product is faster than the separation speed between the two sliders.

[0009] Furthermore, the product is formed with a first sleeve cavity, a second sleeve cavity, and a third sleeve cavity from the inside to the outside in the radial direction, and a fourth sleeve cavity is also formed at the bottom of the product. The depths between the multiple sleeve cavities are different.

[0010] Furthermore, chutes are provided on the sliders. After the two sliders slide synchronously towards each other and hold together, the two chutes form the outer contour of the product.

[0011] Furthermore, multiple layers of steps are formed on the outer surface of the product, and step grooves matching the steps are formed on the inner wall of the chute.

[0012] Furthermore, the inlay kit includes a movable sleeve, a fixed insert pin, a fixed sleeve, and a fixed top cylinder;

[0013] The fixed insert pin is detachably connected to the first sleeve cavity, the movable sleeve is detachably connected to the second sleeve cavity, and the fixed sleeve is detachably connected to the third sleeve cavity.

[0014] Furthermore, the core-pulling mechanism includes a lower rear mold core and an upper front mold core. The front mold core and the rear mold core are slidably connected through guide posts. The sliders and the inlay kit are arranged between the rear mold core and the front mold core.

[0015] Furthermore, a panel is provided above the front mold core. The panel and the front mold core are slidably connected through guide rods, and the panel is fixedly connected to the top of the movable sleeve;

[0016] The front mold core is fixedly connected to the tops of the fixed insert pin and the fixed sleeve;

[0017] The rear mold core is fixedly connected to the bottom of the fixed top cylinder.

[0018] Furthermore, a spring is provided between the front mold core and the panel.

[0019] Furthermore, the front mold core is also connected with an inclined guide post, which is arranged obliquely downward. The body of the inclined guide post slidably penetrates through the slider, and the slider is slidably connected to the rear mold core.

[0020] The beneficial effects of the present utility model:

[0021] Compared with the traditional method, this technical solution is for core-pulling demolding of products with a multi-layer nested structure. By reasonably designing the core-pulling levels and sequence, the internal structure of the mold is simplified, and at the same time, the mold processing cost is reduced, ensuring the smooth progress of product core-pulling, taking into account the dual requirements of low cost and product structure, and solving the important technical problems existing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following further describes the present utility model with reference to the accompanying drawings.

[0023] Figure 1 is the three-dimensional view of the product, movable sleeve, fixed insert pin, fixed sleeve and fixed ejector barrel in this solution;

[0024] Figure 2 is the cross-sectional view of the product, movable sleeve, fixed insert pin, fixed sleeve and fixed ejector barrel in this solution;

[0025] Figure 3 is the cross-sectional view of the product in this solution;

[0026] Figure 4 is the three-dimensional view of the rear mold core, front mold core and panel in this solution;

[0027] Figure 5 is the side view of the rear mold core, front mold core and panel in this solution;

[0028] Figure 6 is Figure 5 the cross-sectional view at A-A in

[0029] Figure 7 is the front view of the rear mold core, front mold core and panel in this solution;

[0030] Figure 8 is Figure 7 the cross-sectional view at B-B in

[0031] Figure 9 is Figure 7 the cross-sectional view at C-C in

[0032] Figure 10 is Figure 7 the cross-sectional view at D-D in

[0033] Figure 11 is the three-dimensional view of the slider and inclined guide pillar in this solution;

[0034] Figure 12 is the side view of the slider and inclined guide pillar in this solution.

[0035] In the figure: 1. Product; 11. Cavity 1; 12. Cavity 2; 13. Cavity 3; 14. Cavity 4; 15. Step; 2. Movable sleeve; 3. Fixed insert pin; 4. Fixed sleeve; 5. Fixed top sleeve; 6. Rear mold core; 7. Front mold core; 71. Guide rod; 72. Spring; 73. Guide column; 8. Panel; 9. Slider; 91. Oblique guide column; 92. Slot. DETAILED DESCRIPTION

[0036] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 11 , Figure 12 As shown, a multi-layer sleeve core-pulling mechanism of an injection mold is used to pull the core and demold a product 1 with a multi-layer nested structure. The core-pulling mechanism includes a nesting piece and a slider 9. There are at least two sliders 9. The two sliders 9 are arranged in mirror symmetry. The product 1 is arranged between the two sliders. The two sliders 9 can slide to move synchronously toward or away from the product 1. When the two sliders 9 are embraced together, the cavity formed between the two is the outer contour of the product 1, and the nesting piece extends into the contour of the product 1. Subsequently, a hot-melt material can be injected into the contour of the product 1 here by an injection molding machine. After the material is cooled, the product 1 is formed.

[0038] like Figure 1 , Figure 2 , Figure 3 As shown, the product 1 is radially formed with a sleeve cavity 11, a sleeve cavity 12 and a sleeve cavity 13 from the inside to the outside, and a sleeve cavity 4 14 is also formed at the bottom of the product 1. The openings of the multiple sleeve cavities are in the same direction but have different depths. Due to the different depths, when pulling the core, the nested parts in the sleeve cavity with the largest depth should be pulled out first, thereby leaving an empty sleeve cavity to leave deformation space for the product 1 when other nested parts are subsequently pulled out.

[0039] like Figure 1 , Figure 2 , Figure 3As shown, the insert kit includes a movable sleeve 2, a fixed insert pin 3, a fixed sleeve 4, and a fixed ejector cylinder 5. Among them, the fixed insert pin 3 is detachably connected to the first sleeve cavity 11, the movable sleeve 2 is detachably connected to the second sleeve cavity 12, and the fixed sleeve 4 is detachably connected to the third sleeve cavity 13. In this solution, the depth of the second sleeve cavity 12 is the deepest, so the length of the movable sleeve 2 is also the longest. During core pulling, the movable sleeve 2 is first pulled out to create space for the extraction of the fixed insert pin 3 and the fixed sleeve 4.

[0040] As Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 As shown, the core-pulling mechanism includes the rear mold core 6 below and the front mold core 7 above. In this solution, both the front mold core 7 and the rear mold core 6 are square structures, and they are slidably connected through the guide posts 73 located at the end corners. The slider 9 and the insert kit are arranged between the rear mold core 6 and the front mold core 7.

[0041] In this solution, a panel 8 is provided above the front mold core 7. The panel 8 is slidably connected to the front mold core 7 through a guide rod 71. A spring 72 is arranged between the front mold core 7 and the panel 8, and the panel 8 is fixedly connected to the top of the movable sleeve 2. The front mold core 7 is fixedly connected to the tops of the fixed insert pin 3 and the fixed sleeve 4. The rear mold core 6 is fixedly connected to the bottom of the fixed ejector cylinder 5. Since the movable sleeve 2 needs to be first pulled out from the second sleeve cavity 12 during core pulling, the force applied by the injection molding machine on the panel 8 can be released. At this time, the panel 8 automatically slides upward along the guide rod 71 under the action of the spring 72, and the movable sleeve 2 also moves upward accordingly. And at this time, the two sliders 9 still hold together, and at this time, the product 1 can be locked by the clamping force generated between the two sliders 9. The movable sleeve 2 with the longest length can thus be smoothly pulled out until the movable sleeve 2 is completely pulled out of the second sleeve cavity 12, and then the fixed insert pin 3 and the fixed sleeve 4 can be pulled out.

[0042] In this solution, multiple layers of steps 15 are formed on the outer surface of the product 1, and a step groove matching the steps 15 is formed on the inner wall of the card slot 92, and the clamping force is greater during demolding.

[0043] As Figure 10 , Figure 11 , Figure 12As shown in the figure, in this solution, two sliders 9 are slidably connected to the rear mold core 6. The front mold core 7 is also connected with inclined guide posts 91. The inclined guide posts 91 are arranged obliquely downward. The column bodies of the inclined guide posts 91 slidably penetrate through the sliders 9, and the inclined directions of the two inclined guide posts 91 are mirror-symmetrical. Groove slots 92 are formed in the sliders 9. After the two sliders 9 approach and hold together synchronously, the two groove slots 92 form the outer contour of the product 1. When the front mold core 7 moves upward along the guide post 73 under the action of the lifting force, the inclined guide posts 91 use their inclined angles to drive the sliders 9 to move away synchronously along the surface of the rear mold core 6, that is, the sliders 9 move outward. At the same time, since the sliders 9 are slidably connected to the rear mold core 6, it can prevent the sliders 9 from falling or shifting.

[0044] When the movable sleeve 2 has been completely withdrawn, at this time, the second sleeve cavity 12 can serve as a deformation space when the fixed insert pin 3 and the fixed sleeve 4 are withdrawn, which can not only prevent the product 1 from being damaged and flawed, but also facilitate the smooth withdrawal of the fixed insert pin 3 and the fixed sleeve 4. When the fixed insert pin 3 and the fixed sleeve 4 are withdrawn, since the fixed insert pin 3 and the fixed sleeve 4 are installed on the front mold core 7, when the front mold core 7 moves upward, the two sliders 9 also slowly separate due to the inclined guide posts 91. The fixed insert pin 3 and the fixed sleeve 4 are gradually withdrawn from the first sleeve cavity 11 and the third sleeve cavity 13, and the separation speed between the fixed insert pin 3 and the fixed sleeve 4 and the product 1 is faster than the separation speed between the two sliders 9, because the sliders 9 that have not been completely separated can still generate a clamping force on the product 1 to limit the product 1, which is beneficial to the withdrawal of the fixed insert pin 3 and the fixed sleeve 4. Until the front mold core 7 and the rear mold core 6 are completely separated, the movable sleeve 2, the fixed insert pin 3, and the fixed sleeve 4 are completely withdrawn from the product 1, and the two sliders 9 are also completely separated. At this time, the product 1 can be taken out to separate the product 1 from the fixed ejector cylinder 5, and the core-pulling demolding step is completed.

[0045] This solution is for core-pulling demolding of the product 1 with a multi-layer nested structure. By reasonably designing the core-pulling levels and sequences, the internal structure of the mold is simplified, and at the same time, the mold processing cost is reduced, ensuring the smooth progress of the core-pulling of the product 1, taking into account the dual requirements of low cost and the structure of the product 1, and solving the important technical problems existing in the prior art.

[0046] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0047] The above content is only an example and explanation of the present utility model. Those skilled in the art to which this technology belongs can make various modifications or supplements to the described specific embodiments or use similar methods for substitution. As long as it does not deviate from the utility model or exceed the scope defined by this claims, it shall fall within the protection scope of the present utility model.

Claims

1. An injection mold multi-layer sleeve core-pulling mechanism is used for core-pulling and demolding of products with a multi-layer nested structure, and is characterized in that, The core-pulling mechanism includes an insert sleeve and sliders. There are at least two sliders, which are symmetrically arranged mirror-image to each other. The product is disposed between the two sliders, and the two sliders can slide synchronously towards or away from the product. The insert sleeve is detachably connected to the product, and the separation speed between the insert sleeve and the product is faster than the separation speed between the two sliders.

2. The multi-layer sleeve core-pulling mechanism of an injection mold according to claim 1, characterized in that The product is formed with a first sleeve cavity, a second sleeve cavity, and a third sleeve cavity from inside to outside in the radial direction, and a fourth sleeve cavity is further formed at the bottom of the product. The depths between the multiple sleeve cavities are different.

3. The multi-layer sleeve core-pulling mechanism of an injection mold according to claim 1, characterized in that, A clamping groove is formed on the slider. After the two sliders synchronously approach and are clamped together, the two clamping grooves form the outer contour of the product.

4. The multi-layer sleeve core-pulling mechanism of an injection mold according to claim 3, characterized in that, Multiple steps are formed on the outer surface of the product, and step grooves matching the steps are formed on the inner wall of the clamping groove.

5. The multi-layer sleeve core-pulling mechanism of an injection mold according to claim 2, characterized in that, The insert sleeve includes a movable sleeve, a fixed insert pin, a fixed sleeve, and a fixed top cylinder. The fixed insert pin is detachably connected to the first sleeve cavity, the movable sleeve is detachably connected to the second sleeve cavity, and the fixed sleeve is detachably connected to the third sleeve cavity.

6. The multi-layer sleeve core-pulling mechanism of an injection mold according to claim 5, characterized in that The core-pulling mechanism includes a lower rear mold core and an upper front mold core. The front mold core and the rear mold core are slidably connected through guide posts. The sliders and the insert sleeve are disposed between the rear mold core and the front mold core.

7. The multi-layer sleeve core-pulling mechanism of an injection mold according to claim 6, wherein A panel is arranged above the front mold core. The panel and the front mold core are slidably connected through guide rods, and the panel is fixedly connected to the top of the movable sleeve. The front mold core is fixedly connected to the tops of the fixed insert pin and the fixed sleeve. The rear mold core is fixedly connected to the bottom of the fixed top cylinder.

8. The multi-layer sleeve core-pulling mechanism of an injection mold according to claim 7, wherein, A spring is arranged between the front mold core and the panel.

9. The multi-layer sleeve core-pulling mechanism of an injection mold according to claim 6, characterized in that, The front mold core is further connected with an inclined guide post. The inclined guide post is arranged obliquely downward, and the column body of the inclined guide post slidably penetrates through the slider. The slider is slidably connected to the rear mold core.

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