An undercut demoulding structure for injection molding of automobile radiator water chamber

Abstract

The utility model provides an undercut demoulding structure for the injection molding of a car radiator water chamber, which belongs to the technical field of injection molds and is used to solve the technical problem of high production and maintenance costs of existing injection molds. The structure sets an undercut demoulding component between the upper mold plate and the lower mold plate, and the undercut demoulding component includes an inner needle, a slider, an inner needle sleeve and a fixed seat. The lower end of the inner needle is fixed on the lower mold plate, the fixed seat is installed on the lower mold plate, the slider is slidably set on the lower mold plate, a pressure plate is set on the inner side of the slider, and an inclined guide block matching the pressure plate is set at the lower end of the inner needle sleeve. The pressure plate is inserted from the side of the fixed seat to abut against the inclined guide block. The structure realizes demoulding of the undercut part through the undercut demoulding component, and the mold realizes demoulding through a mechanical structure, which is safe and reliable, with stable performance, and eliminates the bottom plate and spring glue in the existing mold, which greatly reduces the production and maintenance costs of the mold, and is conducive to improving production capacity.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, and relates to an injection mold for a water chamber of an automobile radiator, in particular to an undercut demoulding structure for injection molding of a water chamber of an automobile radiator. Background Art

[0002] Injection molding, also known as injection molding, is a molding method that combines injection and molding. The advantages of the injection molding method are fast production speed, high efficiency, and automated operation. Injection molding is suitable for mass production and molding processing fields such as products with complex shapes. The steps of injection molding are usually divided into the following steps: mold closing, injection, pressure holding, cooling, mold opening, and product removal (demolding).

[0003] like Figure 1 The structure diagram of a car radiator water chamber is shown in FIG. 1 , and the radiator water chamber is formed by injection molding. Figure 2 and 3 The schematic diagram of the existing injection mold structure for producing the automobile radiator water chamber is shown in FIG. The mold includes a top plate 2, an upper mold plate 3, an inner needle 4, a lower mold plate 5, a bottom plate 6 and a support seat 7. A spring glue 13 is arranged between the bottom plate 6 and the lower mold plate 5. Since the water chamber is provided with an overflow port (i.e. Figure 1 The overflow port is formed by an inner needle and an inner needle sleeve. During demoulding, due to the structure of the undercut position 101, a gap of about 10 mm is required between the undercut position 101 and the mold to facilitate demoulding of the undercut position 101.

[0004] When the mold is working, when the injection molding machine is full of products, the mold is first bounced open by the bottom plate 6, and the bottom plate 6 and the lower template 5 are separated by the power of the spring glue 13. The inner needle 4 is fixed on the bottom plate 6. When the bottom plate 6 and the lower template 5 are separated, the inner needle 4 is driven to move downward at the same time. The downward movement of the inner needle 4 will cause a gap in the product. Since the plastic product is elastic, the internal gap can be separated from the external undercut position 101, thereby achieving demoulding.

[0005] This structure has the following disadvantages:

[0006] Since the lower mold plate 5 is relatively thick, the spring glue 13 will bounce up due to the large force, which will cause easy wear and deformation, and the ejection will be non-parallel, resulting in the phenomenon of inner needle breakage and mold collision; adding an extra bottom plate to the mold will become a fine-gate mold base, which is not an ordinary mold base and has a higher cost; the spring glue 13 is easy to wear and needs to be replaced, and the maintenance cost of the mold increases. Since the entire set of molds needs to be disassembled, it takes a long time, which affects production efficiency.

[0007] Therefore, a new type of undercut demoulding structure for automobile radiator water chamber injection molding is designed, and a mechanical structure is used to realize the demoulding of the undercut position, which is safe and reliable, avoids the problem of repeated maintenance, and reduces the cost of mold making and subsequent maintenance. Utility Model Content

[0008] The purpose of the utility model is to solve the above problems in the existing technology and propose an undercut demoulding structure for the injection molding of an automobile radiator water chamber. The technical problem to be solved by the device is: how to design an undercut demoulding structure for an injection molded part which is easy to demould, has low production cost and is easy to maintain.

[0009] The purpose of the utility model can be achieved through the following technical solutions:

[0010] A demoulding structure for an undercut part used for injection molding of a car radiator water chamber comprises a top plate, an upper template, a lower template and a support seat, an undercut part is arranged on the car radiator water chamber, the lower template is mounted on the support seat, the top plate is mounted on the top of the upper template, and the upper template and the lower template cooperate with each other; an undercut demoulding assembly is arranged between the upper template and the lower template, the undercut demoulding assembly comprises an inner needle, a slider, an inner needle sleeve and a fixed seat, the lower end of the inner needle is fixed on the lower template, the inner needle sleeve is sleeved on the inner needle and is slidably connected with the inner needle, the fixed seat is fixedly mounted on the lower template, and the inner needle sleeve is slidably arranged in the fixed seat, the slider is slidably arranged on the lower template, and the slider is located on the outer side of the fixed seat, a pressing plate is arranged on the inner side of the slider, and an inclined guide block cooperating with the pressing plate is arranged at the lower end of the inner needle sleeve, and the pressing plate is inserted from the side of the fixed seat to abut against the inclined guide block.

[0011] The working principle of the utility model is as follows: when the mold is opened after the product is injection molded and cooled, the slider slides outward, the pressure plate is separated from the fixed seat, that is, the pressure plate is separated from the inclined guide block, and when the product is ejected, since the pressure plate does not limit the inclined guide block, the inner needle sleeve moves upward for a certain distance together with the product, and the inner needle is fixed on the lower template and does not move, and a certain gap is generated between the inner needle sleeve and the inner needle. Since the plastic product is elastic, after the gap is generated, the undercut can be separated from the mold to achieve demoulding; when the mold is closed, the slider slides inward, the pressure plate is inserted into the fixed seat and the inclined guide block is pressed down to reset the inner needle sleeve, and injection molding can be performed again.

[0012] A limiting groove is arranged inside the fixing seat, the oblique guide block is slidably arranged in the limiting groove, a guide groove is opened on the side of the fixing seat, and the pressing plate is inserted into the fixing seat through the guide groove to abut against the oblique guide block.

[0013] The travel of the inclined guide block sliding in the limiting groove is 0-10mm.

[0014] With the above structure, when the product is demoulded, the inner needle sleeve moves upward 10 mm with the product, so that a gap is generated between the inner needle sleeve and the inner needle, thereby realizing demoulding at the undercut position.

[0015] The upper end surface of the inclined guide block is provided with an upper inclined surface, and the lower end surface of the pressing plate is provided with a lower inclined surface matching the upper inclined surface.

[0016] With the above structure, the lower end of the pressing plate and the upper end of the inclined guide block cooperate through the inclined surface. When the mold is closed, the slider slides inward. During the forward movement of the pressing plate, the inclined surface cooperates to press the inclined guide block down and reset it, thereby driving the inner needle sleeve to move down and reset.

[0017] An inner needle fixing plate is provided at the lower end of the inner needle, through which the inner needle passes, and the inner needle is fixed to the lower template through the inner needle fixing plate. The inner needle fixing plate and the lower template are connected by bolts, and this structure facilitates the installation and replacement of the inner needle.

[0018] The upper part of the inner needle is in a conical structure that is smaller at the top and larger at the bottom. The inner needle is designed to be in a conical structure to facilitate demoulding of the overflow port of the product and reduce the defective product rate.

[0019] A sliding sleeve is fixed on the inner needle, and the sliding sleeve is located inside the inner needle sleeve and is slidably connected with the inner needle sleeve.

[0020] With the above structure, the inner needle is slidably connected with the inner needle sleeve through the sliding sleeve, and the undercut position is formed by the inner needle, the inner needle sleeve and the sliding sleeve. When the inner needle sleeve moves upward with the product, a gap is generated at the undercut position. Since the product is elastic, after the gap is generated, the undercut position produces a certain elastic deformation and can be detached from the mold, thereby achieving demoulding.

[0021] Compared with the prior art, the undercut demoulding structure for injection molding of the automobile radiator water chamber has the following advantages:

[0022] An improvement is made on the structure of the existing mold, and the demoulding of the undercut part is achieved through the undercut demoulding component, so that the car radiator water chamber can be demoulded smoothly; the mold realizes the demoulding of the undercut part through the mechanical structure, which is safe and reliable, with stable performance and high demoulding efficiency, and the bottom plate and spring glue in the existing injection mold are eliminated, so the mold manufacturing cost is greatly reduced; at the same time, during use, there is no need to replace the spring glue, which reduces the later maintenance cost, reduces the maintenance time, and improves the production capacity and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the water chamber of the automobile radiator;

[0024] Figure 2 It is a three-dimensional structural schematic diagram of an existing injection mold;

[0025] Figure 3 It is a schematic diagram of the cross-sectional structure of an existing injection mold;

[0026] Figure 4 It is a three-dimensional structural schematic diagram of the utility model;

[0027] Figure 5 It is a schematic diagram of the internal structure of the utility model;

[0028] Figure 6 It is a schematic diagram of the top view structure of the utility model;

[0029] Figure 7 yes Figure 6 Structural diagram of the AA section;

[0030] Figure 8 It is a structural schematic diagram of the undercut demoulding component in the utility model;

[0031] Fig. 9 yes Figure 8 Structural diagram of the middle BB section;

[0032] Fig.10 It is a schematic diagram of the split structure of the undercut demoulding component in the utility model;

[0033] Fig.11 It is a structural schematic diagram of the slider, inner needle sleeve and fixing seat in the utility model;

[0034] Fig.12 It is a structural schematic diagram of the slider in the utility model;

[0035] In the figure: 1. Automobile radiator water chamber; 101. Inverted position; 2. Top plate; 3. Upper template; 4. Inner needle; 5. Lower template; 6. Bottom plate; 7. Support seat; 8. Slider; 801. Pressing plate; 9. Inner needle sleeve; 901. Oblique guide block; 10. Fixed seat; 1001. Limiting groove; 1002. Guide groove; 11. Inner needle fixing plate; 12. Sliding sleeve; 13. Spring glue. DETAILED DESCRIPTION

[0036] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0039] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or it can be connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0040] See also Figure 4-12 The present embodiment provides a demolding structure of an undercut part for injection molding of a water chamber of an automobile radiator. The demolding structure of the undercut part is improved on the structure of the existing mold, and a mechanical structure is used to realize demolding of the undercut part, and the bottom plate 6 and the spring glue 13 structure in the existing injection mold are eliminated, thereby reducing the mold manufacturing cost. The demolding is realized by the mechanical structure, and the structure is more stable and reliable, and there is no need to replace the spring glue 13, thereby reducing the later maintenance cost.

[0041] The undercut demoulding structure for injection molding of a car radiator water chamber comprises a top plate 2, an upper template 3, a lower template 5 and a support seat 7. An undercut position 101 is arranged on the car radiator water chamber 1, the lower template 5 is installed on the support seat 7, the top plate 2 is installed on the top of the upper template 3, and the upper template 3 and the lower template 5 cooperate with each other; an undercut demoulding component is arranged between the upper template 3 and the lower template 5, and the undercut demoulding component comprises an inner needle 4, a slider 8, an inner needle sleeve 9 and a fixing seat 10, and the lower end of the inner needle 4 Fixed on the lower template 5, the inner needle sleeve 9 is sleeved on the inner needle 4 and slidably connected thereto, the fixed seat 10 is fixedly installed on the lower template 5, and the inner needle sleeve 9 is slidably set in the fixed seat 10, the slider 8 is slidably set on the lower template 5, and the slider 8 is located on the outside of the fixed seat 10, a pressing plate 801 is provided on the inner side of the slider 8, and an inclined guide block 901 matching the pressing plate 801 is provided at the lower end of the inner needle sleeve 9, and the pressing plate 801 is inserted from the side of the fixed seat 10 and abuts against the inclined guide block 901. When the product is injected and the mold is opened, the slider 8 slides outward, and the pressing plate 801 is separated from the fixed seat 10, that is, the pressing plate 801 is separated from the inclined guide block 901. When the product is ejected, since the pressing plate 801 does not restrict the inclined guide block 901, the inner needle sleeve 9 moves upward for a certain distance together with the product, and the inner needle 4 is fixed on the lower template 5 and does not move, and a certain gap is generated between the inner needle sleeve 9 and the inner needle 4. Since the plastic product is elastic, after the gap is generated, the undercut 101 can be separated from the mold to achieve demoulding; when closing the mold, the slider 8 slides inward, the pressing plate 801 is inserted into the fixed seat 10 and presses down the inclined guide block 901 to reset the inner needle sleeve 9, and injection molding can be performed again.

[0042] The fixing seat 10 has a limiting groove 1001 disposed inside, and the inclined guide block 901 is slidably disposed in the limiting groove 1001 . A guide groove 1002 is provided on the side of the fixing seat 10 , and the pressing plate 801 is inserted into the fixing seat 10 through the guide groove 1002 and abuts against the inclined guide block 901 .

[0043] The inclined guide block 901 is slidably set in the limiting groove 1001 with a stroke of 0-10mm; when the product is demoulded, the inner needle sleeve 9 moves upward 10mm with the product, so that a gap is generated between the inner needle sleeve 9 and the inner needle 4, thereby realizing the demoulding of the undercut position 101.

[0044] The upper end surface of the inclined guide block 901 is provided with an upper inclined surface, and the lower end surface of the pressing plate 801 is provided with a lower inclined surface matched with the upper inclined surface; the lower end of the pressing plate 801 and the upper end of the inclined guide block 901 cooperate with each other through the inclined surfaces, and when the mold is closed, the slider 8 slides inward, and during the forward movement of the pressing plate 801, the inclined guide block 901 can be pressed down and reset through the inclined surface cooperation, that is, the inner needle sleeve 9 is driven to move down and reset.

[0045] An inner needle fixing plate 11 is provided at the lower end of the inner needle 4, and the inner needle 4 passes through the inner needle fixing plate 11. The inner needle 4 is fixed to the lower template 5 through the inner needle fixing plate 11. The inner needle fixing plate 11 and the lower template 5 are connected by bolts. This structure facilitates the installation and replacement of the inner needle 4.

[0046] The upper part of the inner needle 4 is in a conical structure that is smaller at the top and larger at the bottom, which facilitates demoulding of the product at the overflow port and reduces the defective product rate.

[0047] A sliding sleeve 12 is fixed on the inner needle 4, and the sliding sleeve 12 is located inside the inner needle sleeve 9 and is slidably connected thereto; the inner needle 4 is slidably connected to the inner needle sleeve 9 through the sliding sleeve 12, and its undercut position 101 is formed by the inner needle 4, the inner needle sleeve 9 and the sliding sleeve 12. When the inner needle sleeve 9 moves upward with the product, a gap is generated at the undercut position 101. Since the product is elastic, after the gap is generated, the undercut position 101 produces a certain elastic deformation and can be detached from the mold, thereby achieving demoulding.

[0048] The working principle of this utility model:

[0049] The utility model provides an undercut demoulding structure for injection molding of a car radiator water chamber, which is improved on the basis of the structure of the existing mold, and the demoulding of the undercut part is realized by an undercut demoulding component, so that the car radiator water chamber 1 can be demoulded smoothly; the demoulding of the undercut part is realized by a mechanical structure, which is safe and reliable, and has high efficiency, and the bottom plate 6 and the spring glue 13 in the existing injection mold are eliminated, and the mold is changed from a non-standard mold base to a common mold base, and the production and maintenance costs are greatly reduced; at the same time, there is no need to replace the spring glue 13, which reduces the later maintenance cost and the maintenance time, and is conducive to improving production capacity and benefits.

[0050] When the mold is opened, the slider 8 slides outward, driving the pressure plate 801 to move outward and disengage from the fixed seat 10, that is, the pressure plate 801 is disengaged from the inclined guide block 901. When the product is ejected, since there is no pressure plate 801 above the inclined guide block 901 to limit it, the inner needle sleeve 9 moves upward 10 mm with the product; during injection molding, since the undercut position 101 is formed by the cooperation of the inner needle 4, the inner needle sleeve 9 and the sliding sleeve 12, when the inner needle sleeve 9 moves upward with the product, while the inner needle 4 and the sliding sleeve 12 are fixed, a gap is generated at the undercut position 101. Since the product is elastic, after the gap is generated, the undercut position 101 produces a certain elastic deformation and can be detached from the mold, thereby achieving demolding.

[0051] When the mold is closed, the slider 8 slides inward, the pressing plate 801 is inserted into the fixing seat 10 and presses down the inclined guide block 901 to reset the inner needle sleeve 9, forming a reciprocating motion, and injection molding can be performed again.

[0052] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. An undercut demoulding structure for injection molding of a car radiator water chamber, comprising a top plate (2), an upper template (3), a lower template (5) and a support seat (7), wherein an undercut position (101) is provided on the car radiator water chamber (1), the lower template (5) is mounted on the support seat (7), the top plate (2) is mounted on the top of the upper template (3), the upper template (3) and the lower template (5) cooperate with each other, and characterized in that: An undercut demoulding assembly is arranged between the upper template (3) and the lower template (5), and the undercut demoulding assembly comprises an inner needle (4), a slider (8), an inner needle sleeve (9) and a fixed seat (10). The lower end of the inner needle (4) is fixed on the lower template (5), the inner needle sleeve (9) is sleeved on the inner needle (4) and is slidably connected thereto, the fixed seat (10) is fixedly mounted on the lower template (5), and the inner needle sleeve (9) is slidably arranged in the fixed seat (10), the slider (8) is slidably arranged on the lower template (5), and the slider (8) is located on the outer side of the fixed seat (10), a pressing plate (801) is arranged on the inner side of the slider (8), and an inclined guide block (901) matched with the pressing plate (801) is arranged at the lower end of the inner needle sleeve (9), and the pressing plate (801) is inserted from the side of the fixed seat (10) and abuts against the inclined guide block (901).

2. The undercut demoulding structure for injection molding of a car radiator water chamber according to claim 1, characterized in that: A limiting groove (1001) is arranged inside the fixing seat (10), the inclined guide block (901) is slidably arranged in the limiting groove (1001), a guide groove (1002) is opened on the side of the fixing seat (10), and the pressing plate (801) is inserted into the fixing seat (10) through the guide groove (1002) and abuts against the inclined guide block (901).

3. The undercut demoulding structure for injection molding of a car radiator water chamber according to claim 2, characterized in that: The travel of the inclined guide block (901) slidingly arranged in the limiting groove (1001) is 0-10 mm.

4. The undercut demoulding structure for injection molding of a car radiator water chamber according to claim 1 or 2, characterized in that: The upper end surface of the inclined guide block (901) is provided with an upper inclined surface, and the lower end surface of the pressing plate (801) is provided with a lower inclined surface matching the upper inclined surface.

5. The undercut demoulding structure for automobile radiator water chamber injection molding according to claim 1 or 2, characterized in that: An inner needle fixing plate (11) is provided at the lower end of the inner needle (4), the inner needle (4) passes through the inner needle fixing plate (11), the inner needle (4) is fixed to the lower template (5) through the inner needle fixing plate (11), and the inner needle fixing plate (11) and the lower template (5) are connected by bolts.

6. The undercut demoulding structure for injection molding of a water chamber of an automobile radiator according to claim 5, characterized in that: The upper part of the inner needle (4) is in a conical structure that is smaller at the top and larger at the bottom.

7. The undercut demoulding structure for injection molding of a water chamber of an automobile radiator according to claim 1, characterized in that: A sliding sleeve (12) is fixed on the inner needle (4), and the sliding sleeve (12) is located inside the inner needle sleeve (9) and is slidably connected thereto.

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