Multi-petal collaborative core-pulling full-circumferential reverse-docking injection mold

Abstract

The utility model provides a kind of multi-petal collaborative core-pulling full-week reverse buckling injection mold, including front mould component, front mould kernel, rear mould component, rear mould kernel, side extraction assembly and inner extraction assembly, the side extraction assembly includes the forming block that can be laterally active, the forming block has the reverse buckling inner side wall that is inwardly arranged;The front mould kernel, rear mould kernel and the forming block of each group side extraction assembly jointly constitute injection cavity;The inner extraction assembly is arranged in the injection cavity;First forming side block and second forming side block of the inner extraction assembly are alternately distributed in the outer periphery of forming column and jointly constitute inner forming wall, the first forming side block and second forming side block have reverse buckling outer side wall;The first forming side block is equiwidth on radial cross section and forms inclined guide cooperation with forming column, and the second forming side block is connected with ejector plate of rear mould component by a slanting ejector pin;To ensure that product can smoothly demould.

Description

Technical Field

[0001] This utility model relates to the field of injection molds, specifically to a multi-lobed collaborative core-pulling full-circumference undercut injection mold. Background Technology

[0002] Injection molding is a processing method used for the mass production of certain parts. The specific steps involve injecting molten material under high pressure into a mold cavity, where it cools and solidifies to obtain the molded product. Injection molds are the tools used in injection molding. These tools are composed of various parts, with different molds consisting of different parts. They primarily achieve the shaping of the object by changing the physical state of the material being molded. In modern manufacturing, the molding of product components almost always requires the use of molds.

[0003] like Figure 1 The product 1 shown is a cup-shaped product 1 with wavy undercuts 2 on the entire circumference (i.e., the entire outer circumference). When injection molding, both the outer circumference and the interior need to have undercut sidewalls. In particular, when the interior has undercut sidewalls on the entire circumference, conventional demolding methods are not possible, and there is no way to retract the whole body inward to make room. This requires a new injection mold structure. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a multi-lobed collaborative core-pulling full-circumference undercut injection mold.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A multi-lobed collaborative core-pulling full-circumferential undercut injection mold includes a front mold assembly, a front mold core disposed on the front mold assembly, a rear mold assembly, and a rear mold core disposed on the rear mold assembly; it also includes a side-pulling assembly and an inner-pulling assembly. The side-pulling assembly is provided with at least two sets, each including a laterally movable molding block. The molding block has an inwardly facing undercut inner sidewall. The front mold core, the rear mold core, and the molding blocks of each set of side-pulling assemblies together constitute an injection cavity. The inner-pulling assembly is disposed within the injection cavity. The inner-pulling assembly includes a molding pillar, a plurality of first molding side blocks, and a plurality of second molding side blocks. The first molding side blocks and the second molding side blocks are alternately distributed on the outer periphery of the molding pillar and together constitute an inner molding wall. The first molding side blocks and the second molding side blocks have undercut outer side walls. The first molding side blocks are arranged with equal width in radial cross-section and form an oblique guide fit with the molding pillar. The second molding side blocks are connected to the ejector plate of the rear mold assembly through an oblique ejector pin.

[0006] Furthermore, the rear mold assembly includes a first rear template, a second rear template, and an ejector plate. The first rear template, the second rear template, and the ejector plate are arranged sequentially from front to back. The rear mold core and the side-pulling assembly are both arranged on the first rear template. The forming post of the inner-pulling assembly passes through the rear mold core and the first rear template and is fixed on the second rear template. The angled ejector pin passes through the rear mold core, the first rear template, and the second rear template. The first end of the angled ejector pin is connected to the second forming side block, and its second end is connected to the ejector plate.

[0007] Furthermore, a cooling pipe is inserted inside the molding column.

[0008] Furthermore, a cooling pipe is inserted into the molded block.

[0009] Furthermore, the number of side-drawing components is two sets, and the molding blocks of the two sets of side-drawing components are arranged opposite to each other.

[0010] Furthermore, the number of injection cavities is at least two, and the at least two injection cavities are arranged in a straight line and formed between the molding blocks of the two sets of side-drawing components.

[0011] Furthermore, the side-pulling assembly also includes a slider and a shovel base. The slider is slidably mounted on the rear mold assembly, the molding block is fixed to the inner side of the slider, and the shovel base is fixed on the front mold assembly and forms an oblique guide engagement with the slider.

[0012] The technical solution provided by this utility model has the following beneficial effects: The front mold core, rear mold core, and molding blocks of each set of side-pull components together constitute the injection cavity; the undercut inner sidewall of the molding block is used to mold the outer peripheral surface of the product; the inner pull assembly is set in the injection cavity; the first molding side block and the second molding side block of the inner pull assembly are alternately distributed on the outer periphery of the molding pillar and together form the inner molding wall for molding the inner surface of the product; the first molding side block is set with equal width in the radial cross section and forms an oblique guide fit with the molding pillar. The relative movement of the molding pillar allows the first molding side block to retract inward to make room; while the adjacent second molding side block is ejected at an angle along with the product by an oblique ejector pin, thereby making room; so as to ensure that the product can be demolded smoothly. Attached Figure Description

[0013] Figure 1 The image shown is a cross-sectional view of the injection-molded product. Figure 2 The image shown is a front view of the multi-lobed collaborative core-pulling full-circumference undercut injection mold in the embodiment. Figure 3 As shown Figure 2 Sectional view of line AA in the middle; Figure 4 As shown Figure 2Sectional view of the middle BB line; Figure 5 The diagram shown is a partial structural schematic of the multi-lobed collaborative core-pulling full-circumference undercut injection mold in the embodiment. Figure 6 The diagram shown is a structural schematic of a single-group internal extraction component in the embodiment. Figure 7 The diagram shown is a radial cross-sectional view of a single internal extraction component in the embodiment. Detailed Implementation

[0014] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0015] In the description of this utility model, terms such as "upper", "lower", "left", "right", "front", and "rear" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0017] This embodiment provides a multi-lobed collaborative core-pulling full-circumference undercut injection mold for molding such as Figure 1 Product 1 shown, refer to Figures 2 to 7As shown, the multi-lobed collaborative core-pulling full-circumferential undercut injection mold includes a front mold assembly 11, a front mold core 13 disposed on the front mold assembly 11, a rear mold assembly 12, and a rear mold core 14 disposed on the rear mold assembly 12. It also includes side-pulling components 20 and inner-pulling components 30. The side-pulling components 20 are provided in at least two sets (two sets in this embodiment). Each set of side-pulling components 20 includes a laterally movable (i.e., perpendicular to the mold opening and closing direction) molding block 21. The molding blocks 21 of the two sets of side-pulling components 20 are arranged opposite each other, such as in a left-right opposing arrangement. Each molding block 21 has an inwardly facing undercut inner sidewall 211; this undercut inner sidewall 211 is used to form the outer wall surface of the wavy undercut 2 of the product 1. In this embodiment, the inner wall of each molding block 21 forms a semi-circular cavity, and the sidewall of the cavity is provided with the undercut inner sidewall 211. After the molding blocks 21 of the two sets of side-pulling components 20 are joined together, they form a circular cavity for forming the outer peripheral surface of the product 1. The front mold core 13, the rear mold core 14, and the molding blocks 21 of each set of side-pulling components 20 together constitute an injection cavity, and the inner wall surface of the injection cavity is used to mold the outer surface of the product 1.

[0018] The inner drawing assembly 30 is disposed within the injection cavity. The inner drawing assembly 30 includes a molding column 31, multiple first molding side blocks 32, and multiple second molding side blocks 33. The first molding side blocks 32 and second molding side blocks 33 are alternately distributed around the outer periphery of the molding column 31 and together form an inner molding wall. These alternately distributed first molding side blocks 32 and second molding side blocks 33 form a multi-lobed structure. The first molding side blocks 32 and second molding side blocks 33 have undercut outer side walls 301. The inner drawing assembly 30 is used to mold the inner surface of the product; the undercut outer side walls 301 are used to mold the inner wall surface of the wavy undercut 2 of the product 1.

[0019] In order to facilitate core extraction, such as Figure 7 As shown, the first molding side block 32 is arranged with equal width in the radial cross-section and forms an oblique guide fit with the molding post 31. In this embodiment, the molding post 31 has an oblique guide groove inclined in the axial direction. The first molding side block 32 is slidably fitted in the oblique guide groove. The movement of the molding post 31 in its axial direction can drive the first molding side block 32 to move in the radial direction (i.e., the lateral direction). The first molding side block 32 is arranged with equal width in the radial plane, so that the movement of the first molding side block 32 in the radial direction will not interfere with the second molding side block 33. The space between the two first molding side blocks 32 is filled by the second molding side block 33. The second molding side block 33 is only attached to the side of the molding post 31. The second molding side block 33 is connected to the ejector plate 123 of the rear mold assembly 12 through an oblique ejector pin 15.

[0020] When the injection mold is demolded, the front mold assembly 11 and the rear mold assembly 12 can be separated first, and the front mold core 13 and the rear mold core 14 can also be separated. At the same time, the side-pulling assembly 20 can also be separated first, that is, the molding block 21 of the side-pulling assembly 20 is pulled outward laterally to complete the core pulling of the outer surface of the product. Then, the internal inner-pulling assembly 30 is pulled out. The specific method is as follows: first, the molding pillar 31 is driven to move axially relative to the first molding side block 32, thereby driving the first molding side block 32 to retract radially inward to realize the core pulling of the first molding side block 32. Then, the ejector plate 123 is driven to push forward. During the process, the ejector plate 123 drives the second molding side block 33 to tilt and push out through the inclined ejector pin 15. While driving the product out, the second molding side block 33 is shifted inward to complete the core pulling. At this time, the product can be demolded normally.

[0021] Specifically, to achieve the action of the forming post 31 of the inner drawing component 30, the specific design structure in this embodiment is as follows: the rear mold component 12 includes a first rear template 121, a second rear template 122, and an ejector plate 123. The first rear template 121, the second rear template 122, and the ejector plate 123 are arranged sequentially from front to back. The rear mold core 14 and the side drawing component 20 are both arranged on the first rear template 121. The forming post 31 of the inner drawing component 30 passes through the rear mold core 14 and the first rear template 121 and is fixed on the second rear template 122. The oblique ejector pin 15 passes through the rear mold core 14, the first rear template 121, and the second rear template 122. The first end of the oblique ejector pin 15 is connected to the second forming side block 33, and its second end is connected to the ejector plate 123. When it is necessary to remove the core from the first molding side block 32, the first rear template 121 and the second rear template 122 are separated, and the molding column 31 will move axially relative to the first molding side block 32, thereby driving the first molding side block 32 to remove the core; this setting is simple in structure.

[0022] Meanwhile, in order to enable the product to cool and solidify more quickly, in this embodiment, cooling pipes 16 are inserted into both the molding column 31 and the molding block 21, which helps the product in the injection cavity to cool and solidify quickly.

[0023] The number of injection cavities is at least two; in this embodiment, there are two. The two injection cavities are arranged along a straight line and formed between the molding blocks 21 of the two sets of side-drawing components 20. Thus, the layout can be completed using the molding blocks 21 of the two sets of side-drawing components 20, simplifying the structure. Simultaneously, each injection cavity is equipped with a set of inner-drawing components 30. Of course, in other embodiments, the number of injection cavities can be designed according to actual conditions; the number of side-drawing components 20 can also be multiple sets, such as three or four sets, as long as they cooperate to form an injection cavity.

[0024] Specifically, the side-pulling assembly 20 further includes a slider 22 and a shovel base 23. The slider 22 is laterally slidably mounted on the rear mold assembly 12 (specifically, the first rear template 121). The forming block 21 is fixed to the inner side of the slider 22. The shovel base 23 is fixed on the front mold assembly 11 and forms an oblique guide engagement with the slider 22. Thus, when the front mold assembly 11 and the rear mold assembly 12 separate or approach each other, the front mold assembly 12 drives the shovel base 23 to move relative to the slider 22, thereby driving the slider 22 and the forming block 21 to perform lateral movements. Using a linkage method with the front mold assembly 11 can effectively simplify the structure. Of course, in other embodiments, the forming block 21 can also be directly driven by a hydraulic cylinder or other actuator.

[0025] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A multi-lobed collaborative core-pulling full-circumference undercut injection mold, comprising a front mold assembly, a front mold core disposed on the front mold assembly, a rear mold assembly, and a rear mold core disposed on the rear mold assembly; characterized in that: It also includes a side-pull assembly and an inner-pull assembly. The side-pull assembly is provided with at least two sets, each including a laterally movable molding block. The molding block has an inwardly facing undercut inner sidewall. The front mold core, the rear mold core, and the molding blocks of each set of side-pull assemblies together constitute an injection cavity. The inner-pull assembly is disposed in the injection cavity. The inner-pull assembly includes a molding pillar, a plurality of first molding side blocks, and a plurality of second molding side blocks. The first molding side blocks and the second molding side blocks are alternately distributed on the outer periphery of the molding pillar and together constitute an inner molding wall. The first molding side blocks and the second molding side blocks have undercut outer sidewalls. The first molding side blocks are arranged with equal width in radial cross-section and form an oblique guide fit with the molding pillar. The second molding side blocks are connected to the ejector plate of the rear mold assembly through an oblique ejector pin.

2. The multi-lobed collaborative core-pulling full-circumference undercut injection mold according to claim 1, characterized in that: The rear mold assembly includes a first rear template, a second rear template, and an ejector plate. The first rear template, the second rear template, and the ejector plate are arranged sequentially from front to back. The rear mold core and the side-pulling assembly are both arranged on the first rear template. The forming post of the inner-pulling assembly passes through the rear mold core and the first rear template and is fixed on the second rear template. The angled ejector pin passes through the rear mold core, the first rear template, and the second rear template. The first end of the angled ejector pin is connected to the second forming side block, and its second end is connected to the ejector plate.

3. The multi-lobed collaborative core-pulling full-circumference undercut injection mold according to claim 1, characterized in that: Cooling pipes are inserted inside the molding column.

4. The multi-lobed collaborative core-pulling full-circumference undercut injection mold according to claim 1, characterized in that: Cooling pipes are inserted into the molded block.

5. The multi-lobed collaborative core-pulling full-circumference undercut injection mold according to claim 1, characterized in that: The number of side-pull components is two sets, and the molding blocks of the two sets of side-pull components are arranged opposite to each other.

6. The multi-lobed collaborative core-pulling full-circumference undercut injection mold according to claim 5, characterized in that: The number of injection cavities is at least two, and the at least two injection cavities are arranged in a straight line and formed between the molding blocks of the two sets of side-drawing components.

7. The multi-lobed collaborative core-pulling full-circumference undercut injection mold according to claim 1 or 5, characterized in that: The side-pulling assembly also includes a slider and a shovel base. The slider is slidably mounted on the rear mold assembly. The molding block is fixed to the inner side of the slider. The shovel base is fixed on the front mold assembly and forms an oblique guide engagement with the slider.

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