A low-pressure casting mold for automobile door hinge and a working method thereof

Abstract

The invention relates to a low-pressure casting mold for a car door hinge and a working method thereof. The hinge is in the shape of a thin-walled shell with a curved cavity. The casting mold comprises an upper module, a lower module and an ejection mechanism. An upper mold core is installed below the upper module, and the lower module has a lower mold cavity. When the upper module and the lower module are matched together, a mold cavity for forming the hinge is formed between the upper mold core and the lower mold cavity. The ejection mechanism comprises an ejector rod. The upper mold core is divided into a plurality of sub-mold cores, which are arranged in sequence according to the curved direction of the curved cavity of the hinge. At least one strip groove is provided on the side surface of each sub-mold core used for forming the inner side walls of the hinge curved cavity, and the strip groove is used to form strip protrusions on the inner side walls of the hinge curved cavity. The number of ejector rods is consistent with the number of strip protrusions, and one ejector rod corresponds to one strip protrusion. The strip protrusion increases the contact area between the ejector rod and the upper end surface of the hinge, so as to facilitate smooth demoulding.

Description

Technical Field

[0001] The invention relates to the field of molds, and in particular to a low-pressure casting mold for an automobile door hinge and a working method thereof. Background Art

[0002] Automobile door hinges are generally made by stamping or casting. Stamping hinges are relatively thin and not very safe to use. Therefore, most automobile door hinges are cast. Figure 1 and Figure 2 ) The overall size is relatively large, and it is a thin-walled part with a curved cavity and a long length. Therefore, it is easy to have the disadvantages of difficulty in demolding and poor molding quality during the casting process. Therefore, it is necessary to design a more optimized low-pressure casting mold for automobile door hinges. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a low-pressure casting mold for automobile door hinges with reasonable structural design and good molding quality.

[0004] The technical solution adopted by the present invention to solve the above-mentioned problem is: a low-pressure casting mold for a car door hinge, the hinge is in the shape of a thin-walled shell with a curved cavity, the casting mold includes an upper module, a lower module and an ejection mechanism, an upper mold core is installed under the upper module, and the lower module has a lower mold cavity. When the upper module and the lower module are matched together, the upper mold core is located in the lower mold cavity, and a cavity for forming a hinge is formed between the upper mold core and the lower mold cavity; the ejection mechanism is located above the upper module, and includes a plurality of ejector rods for demolding the formed hinge from the upper mold core; it is characterized in that: the upper mold core is divided into a plurality of sub-mold cores, and the plurality of sub-mold cores are arranged in sequence according to the curved direction of the curved cavity of the hinge, and at least one sub-mold core is provided on the side surface of each sub-mold core used to form the inner two side walls of the curved cavity of the hinge. A vertical strip groove that is wider at the top and narrower at the bottom is provided, and the strip groove is used to form strip protrusions on the inner side walls of the hinge curved cavity; the strip grooves opened on the sides of each two adjacent sub-mold cores are not on the same side, so that the strip grooves opened on the sides of all sub-mold cores are divided into two groups, and the two groups of strip grooves are arranged along the curve direction of the hinge curved cavity, one group of strip grooves is close to one side wall inside the hinge curved cavity, and the other group of strip grooves is close to the other side wall inside the hinge curved cavity; the number of the push rods is consistent with the number of strip protrusions on the inner side walls of the hinge curved cavity, and one push rod corresponds to one strip protrusion; five gates are provided at the bottom of the lower module; the five gates are arranged according to the curve direction of the hinge curved cavity, and the gates are vertically arranged and connected with the lower mold cavity upward.

[0005] Preferably, a shrinkage compensating concave riser is provided on the bottom surface of the upper module for compensating the thick upper portion of one end of the hinge.

[0006] Preferably, the ejection mechanism further includes a locking template, a push rod mounting plate, and a guide column; the locking template is arranged above the upper module through support plates on both sides, the bottom of the support plate is fixedly connected to the upper module, and the top of the support plate is fixedly connected to the locking template; four guide columns are arranged, which are distributed in a rectangular shape between the locking template and the upper module, the top of the guide column is fixedly connected to the locking template, and the bottom of the guide column is fixedly connected to the upper module; the push rod mounting plate is arranged between the locking template and the upper module, and moves up and down along the guide column under power drive, and the push rod is installed under the push rod mounting plate; a through hole for the push rod to pass through is provided on each sub-mold core, and the through hole corresponds to the strip groove provided on the sub-mold core.

[0007] Preferably, the casting mold also includes a slider, and a notch is opened on one side of the lower module. The slider is installed in the notch and can be pulled out from the notch under the action of the core pulling mechanism. The slider is used to form a accommodating groove at one end of the hinge.

[0008] Preferably, the upper mold core is divided into twenty-one sub-mold cores.

[0009] Preferably, the shrinkage-feeding concave riser is sheathed with a heat-insulating sleeve.

[0010] The present invention also provides a working method of a low-pressure casting mold for a vehicle door hinge, comprising the following steps:

[0011] Step 1: The slider is pushed into place by the core pulling mechanism, and the upper die power device moves the upper die block downward and engages with the lower die block to complete the mold closing;

[0012] Step 2: The low-pressure casting machine insulation furnace is connected to the pouring gate, and the liquid metal gradually enters the hinge molding cavity under pressure until it is cast and formed;

[0013] Step 3: After casting, the upper mold core is cooled. After cooling, the slider is pulled apart for demoulding;

[0014] Step 4: The upper mold power device moves the upper mold section and the cast hinge to the demolding position, and the ejection mechanism works to eject the cast hinge downward to complete the demolding of the hinge and the upper mold core.

[0015] Compared with the prior art, the present invention has the following advantages and effects: considering that the hinge is a thin-walled shell structure with a curved cavity, its clamping force on the mold core is relatively large after casting, which makes demolding difficult. Therefore, in the casting mold, the push rod is reasonably arranged and strip-shaped protrusions are cast on the two side walls inside the hinge curved cavity, so that the contact area between the push rod and the upper end face of the hinge is increased, which facilitates smooth demolding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the hinge in an embodiment of the present invention.

[0018] Figure 2 2 is a schematic diagram of a top view of the hinge in an embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the casting mold according to an embodiment of the present invention.

[0020] Figure 4 It is a schematic top view of the structure in which an upper module is installed with twenty-one sub-mold cores in an embodiment of the present invention.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure in which an upper module is installed with twenty-one sub-mold cores in an embodiment of the present invention.

[0022] Figure 6 Schematic diagram of the top view of the lower module in the embodiment of the present invention.

[0023] Description of reference numerals:

[0024] Hinge 101, strip protrusion 1011, receiving slot 1012,

[0025] Upper module 1, upper mold core 11, strip groove 111, shrinkage-feeding concave riser 12,

[0026] Lower die block 2, lower die cavity 21, gate 22

[0027] Through hole 3, exhaust groove 4,

[0028] Push rod 5, locking template 6, push rod mounting plate 7, guide column 8, support plate 9, slider 102. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and by way of examples. The following examples are intended to explain the present invention but the present invention is not limited to the following examples.

[0030] Example

[0031] See also Figures 1 to 6 .

[0032] This embodiment discloses a low-pressure casting mold for a car door hinge, a hinge 101 (refer to Figure 1 and Figure 2 ) is in the shape of a thin-walled shell with a curved cavity. When casting, the thin-walled shell structure usually has a large clamping force on the mold core after casting, making demoulding difficult.

[0033] In this embodiment, the low-pressure casting mold for the hinge includes an upper module 1, a lower module 2 and an ejection mechanism. An upper mold core 11 is installed under the upper module 1, and the lower module 2 has a lower mold cavity 21. When the upper module 1 and the lower module 2 are matched together, the upper mold core 11 is located in the lower mold cavity 21, and a cavity for forming a hinge is formed between the upper mold core 11 and the lower mold cavity 21.

[0034] Specifically, in this embodiment, the upper mold core 11 is divided into twenty-one sub-mold cores (1-1, 2-2, 3-3...21-21), and the twenty-one sub-mold cores are arranged in sequence according to the curved direction of the curved cavity of the hinge, and at least one vertical strip groove 111 that is wider at the top and narrower at the bottom is arranged on the side surface of each sub-mold core used to form the inner side walls of the hinge curved cavity. The strip groove 111 is used to form strip protrusions 1011 on the inner side walls of the hinge curved cavity, and an exhaust groove 4 corresponding to the strip groove 111 is opened on the bottom surface of the upper module 1 to play a role in timely exhaust.

[0035] The strip grooves 111 opened on the sides of every two adjacent sub-mold cores are not on the same side, so that the strip grooves 111 opened on the sides of all sub-mold cores are divided into two groups, and the two groups of strip grooves 111 are arranged along the curve direction of the hinge curve cavity, one group of strip grooves 111 is close to one side wall inside the hinge curve cavity, and the other group of strip grooves 111 is close to the other side wall inside the hinge curve cavity.

[0036] In this embodiment, five gates 22 are arranged at the bottom of the lower module 2; the five gates 22 are arranged according to the curved direction of the curved cavity of the hinge, and the gates 22 are arranged vertically and communicated with the lower mold cavity 21 upward. A shrinkage-compensating concave riser 12 is provided at the bottom surface of the upper module 1 for compensating the thick upper part of one end of the hinge, and a heat-insulating sleeve is installed inside the shrinkage-compensating concave riser 12.

[0037] In this embodiment, the ejection mechanism is located above the upper module 1 and is used to demold the molded hinge and the upper mold core 11. It includes a locking plate 6, an ejector rod mounting plate 7, a guide column 8, and multiple ejector rods 5. The number of ejector rods 5 is consistent with the number of strip protrusions 1011 on the inner side walls of the hinge curve cavity. One ejector rod 5 corresponds to one strip protrusion 1011. The locking template 6 is arranged above the upper module 1 through the support plates 9 on both sides. The bottom of the support plate 9 is fixedly connected to the upper module 1, and the top of the support plate 9 is fixedly connected to the locking template 6; four guide columns 8 are arranged and distributed in a rectangular shape between the locking template 6 and the upper module 1. The top of the guide column 8 is fixedly connected to the locking template 6, and the bottom of the guide column 8 is fixedly connected to the upper module 1; the ejector rod mounting plate 7 is arranged between the locking template 6 and the upper module 1, and moves up and down along the guide column 8 under power drive, and the ejector rod 5 is installed under the ejector rod mounting plate 7; a through hole 3 for the ejector rod 5 to pass through is opened on each sub-mold core, and the through hole 3 corresponds to the strip groove 111 opened on the sub-mold core. In the casting mold, the push rod is reasonably arranged and strip-shaped protrusions are cast on both side walls of the inner side of the hinge curved cavity, so that the contact area between the push rod and the upper end surface of the hinge is increased, which facilitates smooth demoulding.

[0038] In this embodiment, the casting mold also includes a slider 102. A notch is opened on one side of the lower module 2. The slider 102 is installed in the notch and can be pulled out from the notch under the action of the core pulling mechanism. The slider 102 is used to form a accommodating groove 1012 at one end of the hinge.

[0039] In this embodiment, the working method of the low-pressure casting mold of the automobile door hinge includes the following steps:

[0040] Step 1: The slider 102 is pushed into place by the core pulling mechanism, and the upper mold power device moves the upper mold block 1 downward and engages with the lower mold block 2 to complete the mold closing;

[0041] Step 2: The low-pressure casting machine insulation furnace is connected to the pouring gate 22, and the liquid metal gradually enters the hinge forming cavity under pressure until it is cast and formed;

[0042] Step 3: After casting, the upper mold core 3 is cooled, and after cooling is completed, the slider 102 is pulled open for demoulding;

[0043] Step 4: The upper mold power device moves the upper mold block 1 and the cast hinge to the demolding position, and the ejection mechanism works to eject the cast hinge downward, completing the demolding of the hinge and the upper mold core 11.

[0044] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles of the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A low-pressure casting mold for a car door hinge, wherein the hinge (101) is in the shape of a thin-walled shell with a curved cavity, the casting mold comprising an upper mold block (1), a lower mold block (2) and an ejection mechanism, an upper mold core (11) is installed below the upper mold block (1), and the lower mold block (2) has a lower mold cavity (21), when the upper mold block (1) and the lower mold block (2) are matched together, the upper mold core (11) is located in the lower mold cavity (21), and a cavity for forming the hinge is formed between the upper mold core (11) and the lower mold cavity (21); the ejection mechanism is located above the upper mold block (1), and comprises a plurality of ejector rods (5) for demoulding the molded hinge from the upper mold core (11); the characteristics are as follows: The upper mold core (11) is divided into a plurality of sub-mold cores, which are arranged in sequence according to the curvilinear direction of the hinge curvilinear cavity, and at least one vertical strip groove (111) which is wider at the top and narrower at the bottom is provided on the side surface of each sub-mold core used for forming the inner side walls of the hinge curvilinear cavity, wherein the strip groove (111) is used to form strip protrusions (1011) on the inner side walls of the hinge curvilinear cavity; the strip grooves (111) provided on the side surfaces of each two adjacent sub-mold cores are not on the same side, so that the strip grooves (111) provided on the side surfaces of all sub-mold cores are divided into two groups, and the two groups of strip grooves (111) are arranged along the curvilinear direction of the hinge curvilinear cavity, wherein one group of strip grooves (111) is close to one side wall of the inner side of the hinge curvilinear cavity, and the other group of strip grooves (111) is close to the other side wall of the inner side of the hinge curvilinear cavity; The number of the push rods (5) is consistent with the number of the strip-shaped protrusions (1011) on the inner side walls of the hinge curved cavity, and one push rod (5) corresponds to one strip-shaped protrusion (1011); five gates (22) are arranged at the bottom of the lower module (2); the five gates (22) are arranged according to the curved direction of the hinge curved cavity, and the gates (22) are arranged vertically and communicate with the lower mold cavity (21) upward; a shrinkage compensating concave riser (12) is provided at the bottom surface of the upper module (1) for compensating the thick upper part of one end of the hinge; the casting mold also includes a slider (102), a notch is provided on one side of the lower module (2), the slider (102) is installed in the notch, and can be pulled out of the notch under the action of the core pulling mechanism, and the slider (102) is used to form a receiving groove (1012) at one end of the hinge.

2. The low-pressure casting mold for automobile door hinge according to claim 1, characterized in that: The ejection mechanism further comprises a locking plate (6), a push rod mounting plate (7), and a guide column (8); the locking plate (6) is arranged above the upper module (1) via support plates (9) on both sides, the bottom of the support plate (9) is fixedly connected to the upper module (1), and the top of the support plate (9) is fixedly connected to the locking plate (6); four guide columns (8) are arranged and arranged in a rectangular distribution between the locking plate (6) and the upper module (1), the top of the guide column (8) is fixedly connected to the locking plate (6), and the bottom of the guide column (8) is fixedly connected to the upper module (1); the push rod mounting plate (7) is arranged between the locking plate (6) and the upper module (1), and moves up and down along the guide column (8) under power drive, and the ejector rod (5) is installed below the ejector rod mounting plate (7); A through hole is provided on each sub-mold core, through which a push rod (5) can pass, and the through hole corresponds to the strip-shaped groove (111) provided on the sub-mold core.

3. The low-pressure casting mold for automobile door hinge according to claim 1, characterized in that: The upper mold core (11) is divided into twenty-one sub-mold cores.

4. The low-pressure casting mold for automobile door hinge according to claim 1, characterized in that: The shrinkage-feeding concave riser (12) is sheathed with a heat-insulating sleeve.

5. A method for operating the low-pressure casting mold for a vehicle door hinge according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: The slider (102) is pushed into position by the core pulling mechanism, and the upper mold power device moves the upper mold block (1) downward and engages with the lower mold block (2) to complete mold closing; Step 2: The low-pressure casting machine insulation furnace is connected to the pouring gate (22), and the liquid metal gradually enters the hinge forming cavity under pressure until it is cast and formed; Step 3: After casting, the upper mold core (11) is cooled, and after cooling is completed, the slider (102) is pulled open for demoulding; Step 4: The upper mold power device moves the upper mold block (1) and the cast hinge upward to the demoulding position, and the ejection mechanism works to eject the cast hinge downward, completing the demoulding of the hinge and the upper mold core (11).

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