Mould structure for back-off demoulding and working method of mould structure

Abstract

The invention relates to a mold structure for back-off demolding and a working method of the mold structure. The mold structure comprises a back-off demolding mechanism, an upper mold base and a lower mold base. The upper die base comprises an upper fixing plate. The back-off mold stripping mechanism comprises a first inclined guide column, a sliding block seat, a second inclined guide column, a delay block, a sliding block inclined ejector motion track, a sliding block inclined ejector and a sliding block; the first inclined guide column and the second inclined guide column are both connected with the upper fixing plate; the first inclined guide column and the second inclined guide column both penetrate through the sliding block seat; the first inclined guide column penetrates through the sliding block inclined ejection movement track; the sliding block pitched roof is connected with the sliding block pitched roof movement track in a sliding manner; the sliding block is connected with the sliding block pitched roof; the delay block is connected with the sliding block seat; the delay block abuts against the second inclined guide column. Compared with the prior art, the reverse-buckling mold stripping mechanism is arranged, the first inclined guide block and the second inclined guide block are adopted, movement of the sliding block is decomposed, the product function can be guaranteed, the mold structure can be simplified, the mold manufacturing difficulty can be lowered, and a breakthrough from 0 to 1 is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of mold opening, and in particular to a mold structure for undercut demoulding and a working method thereof. Background Art

[0002] Most products only have undercuts on the fixed mold and the movable mold, and do not use undercuts on the slider. However, the market demand is getting higher and higher, the difficulty of product production is also increasing, the product structure is more complex, and the corresponding mold difficulty will also increase synchronously. For example, CN117001944A discloses a method for injection molding of parts, wherein the parts include a body, a plurality of first recessed portions and a plurality of second recessed portions formed on the body, the first recessed portions and the second recessed portions are arranged at 90 degrees, an insert for molding the first recessed portions is installed on the slider that can move in the horizontal direction and is located between the slider and the male mold core, a first guide hole extending in the horizontal direction is provided on the slider, a second guide hole extending in the vertical direction and connected to the first guide hole is provided on the upper surface of the insert, and a movable block that is consistent with the moving direction of the slider can be movably installed in the first guide hole The lower part of a movable insert that can move in the vertical direction is embedded in the second guide hole, and the upper part of the movable insert is exposed and used to form the second recessed portion. The movable insert and the movable block are slidably matched through two inclined surfaces with the same inclination direction. The inclined surface extends upward in the direction close to the inclined guide column and the lengths of the two inclined surfaces are different. A sub-through hole for the inclined guide column to pass through is provided on the upper surface of the movable block. The inner diameter of the sub-through hole with the same inclination direction as the inclined guide column is smaller than the inner diameter of the through hole on the slider, so that the conversion of the demoulding direction of undercuts at different angles is realized in a limited space, thereby realizing undercut demoulding in two different directions through a set of mechanisms.

[0003] How to avoid product damage and simplify the mold structure when the slider is inverted is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a mold structure and a working method for undercut demolding. By setting an undercut demolding mechanism and adopting a first inclined guide block and a second inclined guide block, the movement of the slider is decomposed, which can not only ensure the product function, but also simplify the mold structure and reduce the difficulty of mold manufacturing.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] The first object of the present invention is to provide a mold structure for undercut demolding, the mold structure comprising an undercut demolding mechanism, an upper mold base, and a lower mold base; the upper mold base comprises an upper fixed plate; the undercut demolding mechanism comprises a first inclined guide column, a slider seat, a second inclined guide column, a delay block, a slider inclined top motion track, a slider inclined top, and a slider; the first inclined guide column and the second inclined guide column are both connected to the upper fixed plate; the first inclined guide column and the second inclined guide column both pass through the slider seat; the first inclined guide column passes through the slider inclined top motion track; the slider inclined top is slidably connected to the slider inclined top motion track; the slider is connected to the slider inclined top; the delay block is connected to the slider seat; the delay block abuts against the second inclined guide column.

[0007] Furthermore, the lower die base includes a B plate; the B plate is arranged below the upper fixed plate.

[0008] Furthermore, a horizontal slideway is provided on the B plate; and the slider seat is slidably connected to the B plate.

[0009] Furthermore, the upper die base also includes an A plate; the lower die base also includes a support plate, an ejector plate, an ejector reset plate, and a lower fixed plate; the upper fixed plate, A plate, B plate, support plate, ejector plate, ejector reset plate, and lower fixed plate are arranged in sequence from top to bottom.

[0010] Further, the first oblique guide column includes a first vertical portion and a first oblique guide portion, and the first vertical portion and the first oblique guide portion are connected; the second oblique guide column includes a second vertical portion and a second oblique guide portion, and the second vertical portion and the second oblique guide portion are connected.

[0011] Further, the length of the first vertical portion is smaller than the length of the second vertical portion; the length of the first oblique guide portion is larger than the length of the second oblique guide portion.

[0012] Furthermore, the inclination directions of the first oblique guide portion and the second oblique guide portion are both in a direction away from the product.

[0013] Furthermore, a first movement groove is provided on the slider seat; the slider inclined top movement track includes an inclined guide column connecting part and a slider inclined top connecting part; the inclined guide column connecting part is connected to the slider inclined top connecting part; the inclined guide column connecting part is inserted into the first movement groove; the first inclined guide column passes through the inclined guide column connecting part of the slider inclined top movement track; the slider inclined top is slidably connected to the slider inclined top connecting part.

[0014] Furthermore, an end of the slider abuts against the product.

[0015] Furthermore, the first oblique guide column and the second oblique guide column are both fixed to the upper fixing plate by bolts; two second oblique guide columns are provided, and the two second oblique guide columns are respectively provided on both sides of the first oblique guide column.

[0016] Furthermore, a connecting hole is provided on the sliding block; a protrusion is provided on the inclined top of the sliding block; and the protrusion is connected to the connecting hole.

[0017] Furthermore, the product is a plastic product.

[0018] The first object of the present invention is to provide a mold structure for undercut demolding, wherein a working (mold opening) method of the mold structure for undercut demolding comprises the following steps:

[0019] During the mold opening process, the upper mold base and the lower mold base are relatively separated, and the upper fixed plate of the upper mold base drives the first inclined guide column to move upward. When the first inclined guide portion of the first inclined guide column passes through the inclined guide column connecting portion of the slider inclined top movement track, since the first inclined guide portion is inclined relative to the first vertical portion in the direction away from the product, the slider inclined top movement track is driven to retreat (away from the product), and the slider inclined top moves downward along the slider inclined top connection portion of the slider inclined top movement track to achieve undercut demoulding. During the mold opening process at this stage, the second vertical portion of the second inclined guide column is always in contact with the delay block, and since the second vertical portion is longer than the first vertical portion, the slider seat does not move in the horizontal direction when the second inclined guide column is limited in the horizontal direction, so the slider does not move backward, thereby ensuring that the product will not be damaged.

[0020] Next, when the second inclined guide part of the second inclined guide column contacts the delay block, the second inclined guide part is inclined relative to the second vertical part in the direction away from the product, which drives the slider seat and the delay block to retreat, and further drives the slider inclined top motion track and the slider inclined top to retreat, thereby realizing mold opening.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1) The technical solution provides a mold structure for undercut demolding. By setting an undercut demolding mechanism and using a first oblique guide block and a second oblique guide block, the movement of the slider is decomposed, which can not only ensure the product function, but also simplify the mold structure and reduce the difficulty of mold manufacturing. It is a breakthrough from 0 to 1.

[0023] 2) The technical solution provides a mold structure for undercut demolding, which has a simple structure. In the two-stage mold opening process, the slider will not retreat in the first stage to ensure that the product will not be damaged, and the slider retreats in the second stage to fully realize the mold opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional structure diagram of a mold structure for undercut demoulding in an embodiment of the present invention (cut along the first oblique guide column).

[0025] Figure 2 for Figure 1 A partial enlarged view of .

[0026] Figure 3 It is a schematic cross-sectional structure diagram of a mold structure for undercut demoulding in an embodiment of the present invention (cut along the second oblique guide column).

[0027] Figure 4 Schematic diagram of the three-dimensional structure of the undercut demoulding mechanism in the embodiment of the present invention Figure 1 (Slider not shown).

[0028] Figure 5 Schematic diagram of the three-dimensional structure of the undercut demoulding mechanism in the embodiment of the present invention Figure 2 (Slider not shown).

[0029] Figure 6 It is a three-dimensional schematic diagram of a slider tilting top motion track and a slider tilting top of a mold structure for undercut demolding in an embodiment of the present invention.

[0030] Figure 7 It is a three-dimensional schematic diagram of a slider and a slider inclined top of a mold structure for undercut demolding in an embodiment of the present invention.

[0031] Figure 8 It is a schematic diagram of the separation of the slider bevel top motion track and the slider bevel top of the mold structure used for undercut demolding in an embodiment of the present invention.

[0032] in:

[0033] 1. Upper fixed plate, 2. Plate A, 3. Plate B, 4. Support plate, 6. Ejector plate, 7. Ejector reset plate, 8. Lower fixed plate, 9. First inclined guide column, 10. Slider seat, 11. Second inclined guide column, 12. Delay block, 13. Product, 14. Slider inclined top motion track, 15. Slider inclined top, 16. Slider. DETAILED DESCRIPTION

[0034] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The features such as component models, material names, connection structures, etc. that are not clearly described in this technical solution are all regarded as common technical features disclosed in the prior art.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements; "up", "down", "left", "right" and the like are only used to indicate relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may change. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] It should be noted that, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0037] The present invention is further described in detail below in conjunction with specific embodiments.

[0038] Example

[0039] like Figures 1 to 8 As shown, in this embodiment, a mold structure for undercut demolding is provided, and the mold structure includes an undercut demolding mechanism, an upper mold base, and a lower mold base.

[0040] Figure 2 Part of the structure of the product 13 in the middle A portion is a product undercut, which is a T-shaped undercut in this embodiment, and the undercut is located between the inclined top 15 of the slider and the slider 16.

[0041] The upper die base comprises an upper fixed plate 1 and an A plate 2.

[0042] The lower die base comprises a B plate 3 , a support plate 4 , an ejector plate 6 , an ejector reset plate 7 , and a lower fixing plate 8 .

[0043] The upper fixing plate 1, the A plate 2, the B plate 3, the supporting plate 4, the ejector plate 6, the ejector reset plate 7, and the lower fixing plate 8 are arranged in sequence from top to bottom.

[0044] The undercut demoulding mechanism includes a first inclined guide column 9, a slider seat 10, a second inclined guide column 11, a delay block 12, a slider inclined top motion track 14, a slider inclined top 15, and a slider 16; the first inclined guide column 9 and the second inclined guide column 11 are both connected to the upper fixed plate 1; the first inclined guide column 9 and the second inclined guide column 11 both pass through the slider seat 10; the first inclined guide column 9 passes through the slider inclined top motion track 14; the slider inclined top 15 is slidably connected to the slider inclined top motion track 14; the slider 16 is connected to the slider inclined top 15; the delay block 12 is connected to the slider seat 10; the delay block 12 abuts against the second inclined guide column 11.

[0045] The B plate 3 is provided with a horizontal slideway; the slider seat 10 is horizontally slidably connected to the B plate 3.

[0046] The first oblique guide column 9 includes a first vertical portion and a first oblique guide portion, and the first vertical portion and the first oblique guide portion are connected; the second oblique guide column 11 includes a second vertical portion and a second oblique guide portion, and the second vertical portion and the second oblique guide portion are connected.

[0047] The length of the first vertical portion is smaller than that of the second vertical portion; the length of the first oblique guide portion is larger than that of the second oblique guide portion.

[0048] The inclination directions of the first inclined guide portion and the second inclined guide portion are both in a direction away from the product 13 .

[0049] The slider seat 10 is provided with a first movement groove; the slider inclined top movement track 14 includes an inclined guide column connection part 14-1 and a slider inclined top connection part 14-2; the inclined guide column connection part 14-1 is connected to the slider inclined top connection part 14-2; the inclined guide column connection part 14-1 is inserted into the first movement groove; the first inclined guide column 9 passes through the inclined guide column connection part 14-1 of the slider inclined top movement track 14; the slider inclined top 15 is slidably connected to the slider inclined top connection part 14-2.

[0050] The end of the slider 16 abuts against the product 13 .

[0051] The first oblique guide column 9 and the second oblique guide column 11 are both fixed to the upper fixing plate 1 by bolts; two second oblique guide columns 11 are provided, and the two second oblique guide columns 11 are respectively arranged on both sides of the first oblique guide column 9 .

[0052] The slider 16 is provided with a connecting hole; the slider slant top 15 is provided with a protrusion; the protrusion is connected to the connecting hole.

[0053] The product 13 is a plastic product.

[0054] The rear end of the slider 16 abuts against the slider seat 10 .

[0055] The working (molding) method of the mold structure for undercut demoulding comprises the following steps:

[0056] The first stage: during the mold opening process, the upper mold base and the lower mold base are relatively separated, and the upper fixed plate 1 of the upper mold base drives the first inclined guide column 9 to move upward. When the first inclined guide portion of the first inclined guide column 9 passes through the inclined guide column connecting portion 14-1 of the slider inclined top movement track 14, since the first inclined guide portion is inclined relative to the first vertical portion in the direction away from the product, the slider inclined top movement track 14 is driven to retreat (away from the product 13), and the slider inclined top 15 moves downward along the slider inclined top connection portion 14-2 of the slider inclined top movement track 14 to achieve undercut demolding. During the mold opening process at this stage, the second vertical portion of the second inclined guide column 11 is always in contact with the delay block 12, and since the second vertical portion is longer than the first vertical portion, the slider seat 10 does not move in the horizontal direction when the second inclined guide column 11 is limited in the horizontal direction, so the slider 16 does not move backward, thereby ensuring that the product will not be damaged;

[0057] The second stage: Next, when the second inclined guide part of the second inclined guide column 11 contacts the delay block 12, since the second inclined guide part is inclined relative to the second vertical part in the direction away from the product, it drives the slider seat 10 and the delay block 12 to retreat, and further drives the slider inclined top motion track 14 and the slider inclined top 15 to retreat, thereby realizing mold opening.

[0058] Example 2

[0059] This embodiment provides a mold structure for undercutting the mold. Based on the embodiment 1, this embodiment also includes the following configuration:

[0060] The mold structure for undercut demolding also includes a limit block 17; the limit block 17 is connected to the A plate 2, and when the mold is not opened, the limit block 17 abuts against the tail of the slider seat 10 to further limit the horizontal direction of the slider seat 10 during the first stage of the mold opening process.

[0061] The present invention focuses on the structural improvement of the undercut demoulding part, and the specific arrangement of the injection molding structure does not affect the realization of the undercut demoulding.

[0062] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A mold structure for undercut demoulding, characterized in that: The mold structure includes an undercut demoulding mechanism, an upper mold base, and a lower mold base; The upper die base comprises an upper fixing plate (1); The undercut demoulding mechanism comprises a first inclined guide column (9), a slider seat (10), a second inclined guide column (11), a delay block (12), a slider inclined top motion track (14), a slider inclined top (15), and a slider (16); The first oblique guide column (9) and the second oblique guide column (11) are both connected to the upper fixed plate (1); The first oblique guide column (9) and the second oblique guide column (11) both pass through the slider seat (10); The first inclined guide column (9) passes through the inclined top motion track (14) of the slider; The slider tilting top (15) is slidably connected to the slider tilting top motion track (14); The slider (16) is connected to the slider inclined top (15); The delay block (12) is connected to the slider seat (10); The delay block (12) abuts against the second inclined guide column (11).

2. A mold structure for undercut demoulding according to claim 1, characterized in that: The lower die base comprises a B plate (3); The B plate is arranged below the upper fixed plate (1).

3. A mold structure for undercut demoulding according to claim 2, characterized in that: The B plate (3) is provided with a horizontal slideway; The slider seat (10) is slidably connected to the B plate (3).

4. A mold structure for undercut demoulding according to claim 2, characterized in that: The upper die base also includes an A plate (2); The lower die base further comprises a support plate (4), an ejector plate (6), an ejector reset plate (7), and a lower fixing plate (8); The upper fixing plate (1), the A plate (2), the B plate (3), the supporting plate (4), the ejector plate (6), the ejector reset plate (7), and the lower fixing plate (8) are arranged in sequence from top to bottom.

5. The mold structure for undercut demoulding according to claim 1, characterized in that: The first oblique guide column (9) comprises a first vertical portion and a first oblique guide portion, wherein the first vertical portion and the first oblique guide portion are connected; The second oblique guide column (11) comprises a second vertical portion and a second oblique guide portion, and the second vertical portion and the second oblique guide portion are connected; The length of the first vertical portion is smaller than the length of the second vertical portion; The length of the first oblique guide portion is greater than the length of the second oblique guide portion.

6. A mold structure for undercut demoulding according to claim 5, characterized in that: The inclination directions of the first oblique guide portion and the second oblique guide portion are both in a direction away from the product (13).

7. The mold structure for undercut demoulding according to claim 1, characterized in that: The slider seat (10) is provided with a first movement groove; The slider inclined top motion track (14) comprises an inclined guide column connecting portion (14-1) and a slider inclined top connecting portion (14-2); The inclined guide column connection part (14-1) is connected to the inclined top connection part (14-2) of the slide block; The oblique guide column connecting portion (14-1) is inserted into the first movement groove; The first inclined guide column (9) passes through the inclined guide column connecting portion (14-1) of the inclined top motion track (14) of the slider; The slider inclined top (15) is slidably connected to the slider inclined top connecting portion (14-2).

8. The mold structure for undercut demoulding according to claim 1, characterized in that: The end of the slider (16) abuts against the product (13).

9. The mold structure for undercut demoulding according to claim 1, characterized in that: The first oblique guide column (9) and the second oblique guide column (11) are both fixed to the upper fixing plate (1) by bolts; Two second inclined guide pillars (11) are provided, and the two second inclined guide pillars (11) are respectively provided on both sides of the first inclined guide pillar (9).

10. A working method of a mold structure for undercut demolding according to any one of claims 1 to 9, characterized in that: The steps include: During the mold opening process, the upper mold base and the lower mold base are relatively separated, and the upper fixed plate (1) of the upper mold base drives the first inclined guide column (9) to move upward, driving the slider inclined top motion track (14) to retreat, and the slider inclined top (15) will move downward along the slider inclined top motion track (14) to achieve undercut demoulding. During the mold opening process at this stage, the second inclined guide column (11) and the delay block (12) are always in contact, and the slider seat (10) will not move in the horizontal direction when the second inclined guide column (11) is limited in the horizontal direction, and the slider (16) will not move backward; Next, the second inclined guide column (11) drives the slider seat (10) and the delay block (12) to move backward, and further drives the slider inclined top motion track (14) and the slider inclined top (15) to move backward, thereby realizing mold opening.

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