An injection mold for an automotive fuse holder

Abstract

An injection mold for an automotive fuse holder, comprising: a fixture for carrying a fuse holder base; a bottom mold having a first mold cavity for first injection molding of the fuse holder and a second mold cavity for second injection molding of the fuse holder on the surface for mold closing, the bottom mold further configured with a first runner located between the first mold cavity and the second mold cavity for injecting molding plastic; and an upper mold for cooperating with the bottom mold to close the mold for injection molding of the fuse holder. The fuse holder is successively injection molded in the first mold cavity and the second mold cavity, thereby shortening the transfer time to the second mold cavity after the first injection molding, further reducing the temperature loss during the transfer process, and preventing the generation of deformation of the injection molded product.

Description

Technical Field

[0001] The technical field of the present invention belongs to the field of injection molding, specifically an injection mold for an automotive fuse holder. Background Art

[0002] An automotive fuse holder refers to a base for installing fuses in automotive electrical appliances, and the fuse holder is used to convey driving information to various parts of the vehicle body.

[0003] Currently, most automotive fuse holders are processed by injection molding. Injection molding is a process for producing components made of thermoplastic rubber or thermosetting plastics. That is, the plastic is heated and melted in the barrel of an injection molding machine, and then injected into a closed mold at a very high speed through the nozzle of the barrel. After a certain period of cooling and shaping, the product can be obtained.

[0004] Currently, due to the increasing market requirements for the safety performance of automobiles, especially in the case of the increasing usage rate of new energy vehicles, there is an even higher requirement for the safety performance of automobiles. Among them, the requirements for fuse holders are becoming more prominent, requiring sufficient strength and precise dimensional requirements. When injecting the fuse holder, injection molding is carried out on the fuse holder substrate, and the fuse holder substrate is coated inside, so as to meet the corresponding requirements. As Figure 1 shown, the fuse holder substrate includes two terminals 501 connected to both ends of the fuse, and a terminal body 500 for fixedly installing the terminals 501. Both ends of the terminal body 500 are used to lead out the two terminals 501. However, in the current injection molding process, it is often a one-time injection molding on the fuse holder substrate. However, due to the principle of thermal expansion and contraction, shrinkage will occur on the surface of the injection molded product. The shrinkage area is subjected to the inward contraction force of the surface injection material to form a depression area. This depression area causes a certain dimensional shrinkage of the molded product, thus affecting the dimensional accuracy. At the same time, due to the change in the distance between the two terminals during the cooling and contraction process after injection molding, this seriously affects the installation of automotive fuses or poses a safety risk. The current solution to this situation is often to replace materials with higher stability to solve the problem, so that the size deformation of the injection molded product is smaller, but this greatly increases the production cost. Summary of the Invention

[0005] In view of the defect in the prior art that during the injection molding production process of a fuse holder, due to the shrinkage of the hot-melt injection material during cooling, the overall size changes, the present invention provides a mold for injecting an automotive fuse holder.

[0006] The technical solution is as follows:

[0007] An injection mold for soft circuit centering and outer covering with TPU, comprising:

[0008] An injection mold for an automotive fuse holder, characterized by comprising:

[0009] A fixture for carrying a fuse holder base body. The fixture includes a fixture cross beam and a fork head disposed above the fixture cross beam and inserted into a fuse holder terminal to form an interference fit therewith, and the length of the fork head is greater than the depth of the fuse holder terminal;

[0010] A bottom mold. On the surface of the bottom mold for mold closing, a first mold cavity for first injection molding of the fuse holder is provided. The first mold cavity has a first fork head channel for the fork head to extend into the first mold cavity. On the surface of the bottom mold for mold closing, a second mold cavity for second injection molding of the fuse holder is also provided. The second mold cavity is shaped similar to the first mold cavity, and the area of the opening of the second mold cavity is larger than the area of the opening of the first mold cavity. The second mold cavity has a second fork head channel for the fork head to extend into the second mold cavity. The bottom mold is further provided with a first runner located between the first mold cavity and the second mold cavity for injecting injection molding material;

[0011] An upper mold for cooperating with the bottom mold to close the mold for injection molding of the fuse holder. On the surface of the upper mold for mold closing, a third mold cavity for first injection molding of the fuse holder and for closing the mold with the first mold cavity is provided. On the surface of the upper mold for mold closing, a fourth mold cavity for second injection molding of the multi-fuse holder and for closing the mold with the second mold cavity is also provided. A second runner is disposed between the third mold cavity and the fourth mold cavity. The second runner cooperates with the first runner and is for injecting injection molding material. The injection end of the second runner has water inlets respectively leading into the third mold cavity and the fourth mold cavity.

[0012] Preferably, the second mold cavity is shaped similar to the first mold cavity, and the area of the opening of the second mold cavity is larger than the area of the opening of the first mold cavity. The fourth mold cavity is shaped similar to the third mold cavity, and the area of the opening of the fourth mold cavity is larger than the area of the opening of the third mold cavity.

[0013] Preferably, the fixture is provided with a stripping device, and the stripping device includes

[0014] The separating plate has a through hole for the fork head to pass through. The separating plate is sleeved on the fork head, and pull rods are fixedly arranged at both ends of the separating plate. The pull rods are parallel to the fork head along the axial direction and extend towards the fixture cross beam. A through hole for the pull rods to extend through is provided on the fixture cross beam. A pull rod cap with a diameter larger than that of the pull rod is installed at the top end of the pull rod extending out of the fixture cross beam, and a helical spring is sleeved on a section of the pull rod extending out of the fixture cross beam. The helical spring is compressed by the pull rod cap and the fixture cross beam.

[0015] Preferably, the injection mold further has an automatic demolding structure, and the automatic demolding structure includes:

[0016] An installation table provided on the bottom mold. The top end of the installation table has an inclined surface that slopes downward towards the outside of the bottom mold, and positioning posts are provided on the inclined surface.

[0017] A positioning hole opened on the fixture cross beam for the positioning posts to penetrate into, so that the fixture is installed on the installation table by the positioning posts penetrating into the positioning holes.

[0018] Push wheels provided at both ends of the fixture separating plate. The push wheels are connected to the separating plate through rotating shafts that are rotationally matched with them.

[0019] A push plate provided on the upper mold. The downward orthographic projection of the push plate covers the push wheels, and the lower surface of the push plate has an inclined surface with an inclined direction opposite to that of the inclined surface of the installation table.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: Both the upper mold and the bottom mold are provided with two mold cavities with different volumes, realizing two-stage injection molding of the fuse base. And since the mold cavities for the two injections are both on one bottom mold or upper mold, the time required for converting the fuse base between some first mold cavities and second mold cavities is shorter, which can greatly reduce the temperature loss during the conversion process. During the second injection process, the inner mold body of the first injection still has a relatively high temperature. Therefore, during the cooling process of the injected fuse base, the inner mold body of the first injection greatly reduces the probability of shrinkage. Furthermore, during the cooling process of the fuse base after the second injection, due to the support of the inner mold body, the shrinkage rate is also greatly reduced, thereby ensuring the size and product quality of the injection-molded fuse base.

[0021] Meanwhile, a stripping device and an automatic stripping structure are provided, enabling the rapid detachment of the fuse base from the jig after the injection molding of the fuse base is completed. Moreover, under the action of the automatic stripping structure, the already injection-molded fuse base can be quickly and conveniently detached from the jig during the injection molding process, achieving automatic stripping directly with reduced manual participation, reducing the manual labor intensity, saving labor, and reducing labor costs.

[0022] The present invention will be further described below in conjunction with the accompanying drawings of the specification and the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural view of the fuse base substrate.

[0024] Figure 2 It is a schematic structural view of the present invention.

[0025] Figure 3 It is a schematic view of the bottom mold structure in the present invention Figure 1 。

[0026] Figure 4 It is a schematic view of the structure of the upper mold in the present invention Figure 1 。

[0027] Figure 5 It is a front view of the jig in the present invention.

[0028] Figure 6 It is a side view of the jig in the present invention.

[0029] Figure 7 It is a schematic view of the bottom mold structure in the present invention Figure 1 。

[0030] Figure 8 It is a schematic view of the structure of the upper mold in the present invention Figure 1 。 DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] In order to make the technical problems, technical solutions, and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] It should be noted that in the embodiments of the present invention, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indications will also change accordingly.

[0033] In addition, in the embodiments of the present invention, the descriptions such as "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features.

[0034] In order to prevent or reduce the shrinkage of the injection molding material during cooling after injection molding of the automotive fuse holder, and to avoid changing the distance dimension between the two terminals during the cooling of the injection molding material, so that the overall size of the finished product meets the standard and the distance between the two terminals matches the fuse, the mold for injection molding of the fuse holder of the present invention adopts the following technical solutions.

[0035] As Figures 2 to 6 shown, this mold includes a fixture for carrying the fuse holder base body. The fixture includes a fixture cross beam 110 and a fork head 111 disposed on the fixture cross beam 110 and used for inserting into the terminal 501 to form an interference fit therewith. After the fork head 111 is inserted into the terminal 501, the fuse holder base body is connected to the fixture to facilitate injection molding. The length of the fork head 111 is greater than the depth of the terminal 501, that is, after the fork head 111 is inserted into the terminal 501, a section of the fork head 111 is in an exposed state. When the bottom mold 200 and the upper mold 300 are closed for injection molding, the fuse base body installed on the fork head 111 can be extended into the first mold cavity 201 or the second mold cavity 203. This exposed section of the fork head is located outside the first mold cavity 201 or the second mold cavity 203 and is clamped by the upper mold 300 and the bottom mold 200.

[0036] This mold has a bottom mold 200 and an upper mold 300 located above the bottom mold 200.

[0037] On the surface of the bottom mold 200 for mold closing, a first mold cavity 201 for the first injection molding of the fuse holder and a second mold cavity 203 for the second injection molding of the fuse holder are provided. A first runner 204 for injecting the injection molding material is also provided between the first mold cavity 201 and the second mold cavity 203. And on one side of the first mold cavity 201 and the second mold cavity 203, a first fork head channel 202 and a second fork head channel 205 for matching with the exposed fork head and allowing it to pass through are opened.

[0038] On the mating surface of the upper mold 300 for mating with the bottom mold, a third mold cavity 301 is provided for the first injection molding of the fuse base and corresponding to the first mold cavity 201. Similarly, a fourth mold cavity 302 corresponding to the second mold cavity 203 is also provided. At the same time, a second runner 303 corresponding to the first runner 204 is configured, and at the injection end of the second runner 303, there are gates 304 leading to the third mold cavity 301 and the fourth mold cavity 302 respectively, for injecting the molten plastic into the third mold cavity 301 and the fourth mold cavity 302, and then entering the first mold cavity 201 and the second mold cavity 203 to perform injection molding on the fuse base.

[0039] Specifically, the second mold cavity 203 is arranged in imitation of the first mold cavity 201, and the area of the opening of the second mold cavity 203 is larger than the area of the opening of the first mold cavity 201. Similarly, the fourth mold cavity 302 is arranged in imitation of the third mold cavity 301, and the area of the opening of the fourth mold cavity 302 is larger than the area of the opening of the third mold cavity 301.

[0040] The mold for the automotive fuse base of the present invention uses the following process to inject mold the fuse base, and the steps are as follows:

[0041] S1. After placing the fuse base mounted on the fixture into the first mold cavity 201, the upper mold 300 and the bottom mold 200 are closed to perform the first injection molding on the fuse base;

[0042] S2. After demolding the fuse base that has been injection molded for the first time, it is immediately placed into the second mold cavity 203, and the upper mold 300 and the bottom mold 200 are closed to perform the second injection molding on the fuse base;

[0043] S3. Demold the fuse base that has been injection molded for the second time and place it at room temperature for cooling;

[0044] In the above injection molding process of the automotive fuse base, as Figure 5 shown, the fork head 111 of the fixture is pre-set into a shape matching the terminal 501 of the fuse base, and the fork head 111 of the fixture is inserted onto the terminal 502 of the fuse base, so that the base is fixed on the fixture, and the base fixed on the fixture is placed into the first mold cavity 201 of the bottom mold 200. The first fork head channel 202 provided on the first mold cavity 201 accommodates a section of the fork head 111 that is exposed when it is connected to the terminal 501, thereby facilitating the closing of the upper mold 300 and the bottom mold 200 for injection molding. The exposed fork head 111 is clamped by the closed upper mold 300 and the bottom mold, so that the fuse base is located at the middle position of the first mold cavity 201 and the third mold cavity 301 after closing the mold. The remaining space of the closed first mold cavity 201 and the third mold cavity 301 is for injecting the plastic for injection molding.

[0045] AsFigures 3 to 4 As shown in the figure, a water inlet 304 is provided above the second runner 303 of the upper mold 300 and is respectively communicated with the third cavity 301 and the fourth cavity 302 to inject plastic into their interiors. When the upper mold 300 and the bottom mold 200 are closed for injection molding, the injection plastic is injected into the space of the first cavity 201 and the third cavity 301 that have been closed through the water inlet 304 for the first injection molding process to obtain the inner mold body of the fuse base.

[0046] After the first injection molding process is completed, the fixture together with the inner mold body of the fuse base is taken out from the first cavity 201 and quickly placed into the second cavity 203 of the bottom mold 200. In the design, the second cavity 203 is shaped like the first cavity 201, and the area of the opening of the second cavity 203 is larger than that of the opening of the first cavity 201, and its internal volume is larger than that of the first cavity 201. So that when the inner mold body of the fuse base is placed into the second cavity 203, there is still spare space in the second cavity 203, that is, when the upper mold 300 and the bottom mold 200 are closed, there is still moving space around the inner mold body of the fuse base located in the second cavity 203 and the fourth cavity 302 after being closed for the injection plastic to be injected for injection molding, that is to say, a second injection molding is carried out for the inner mold body of the fuse base.

[0047] Among them, the inner mold body of the fuse base formed after the first injection molding of the fuse base is immediately subjected to the second injection molding. Therefore, the inner mold body has not been in contact with room temperature or cold air for a long time for cooling, so it still has a relatively high temperature and is not enough to cause the size of the inner mold body to deform. In this state, the second injection molding process is carried out on it, so that a relatively high temperature rubber and plastic material is injected again on the inner mold body.

[0048] Since the interval time between the first injection molding and the second injection molding is relatively short, the temperature of the inner mold body formed by the first injection molding has not cooled, so that when the second injection molding is carried out, the molten injection plastic can be better integrated with the inner mold body by injection molding. At the same time, the second injection molding is carried out on the inner mold body that has solidified but the temperature has not dropped. So that when the fuse base after two injection moldings is cooled, the inner mold body has a slower cooling speed after being reheated by the second injection molding, greatly avoiding the occurrence of deformation of the inner mold body. At the same time, since the second injection molding is completed on the inner mold body, the injection volume is small, and there is already a cooled and stable inner mold body inside it. Therefore, the deformation amount of the product after the second injection molding is small.

[0049] Among them, the first mold cavity 201 and the third mold cavity 301 for the first injection molding, and the second mold cavity 203 and the fourth mold cavity 302 for the second injection molding are respectively arranged on the bottom mold 200 and the upper mold 300. Therefore, after the first injection molding is completed, the fuse base substrate to be injection molded can be converted between the stations of the first injection molding and the second injection molding without passing through any intermediate components. The time spent in the process of converting the fuse base substrate is short, which can greatly slow down the loss of temperature on the inner mold body of the fuse base during the conversion process, and thus ensure that the deformation of the size of the inner mold body is within the specified standard.

[0050] At the same time, two mold cavities for the first and second mold clamping and injection molding are both arranged on the bottom mold or the upper mold. After the first injection molding, the second injection molding can be conveniently and quickly carried out on the same mold. And the time used in the process of converting the injection molded fuse base from the first injection molding to the second injection molding is short, which can greatly reduce the shrinkage phenomenon caused by the contact time between the inner mold body of the fuse base formed by the first injection molding and the cold air, and reduce the deformation of the inner mold body caused by shrinkage. At the same time, since the mold cavities for the first injection molding and the second injection molding are arranged on the same mold, it can greatly reduce the use of labor, reduce the investment in labor costs, and reduce the production cost.

[0051] Furthermore, a first reinforcing rib 206 and a second reinforcing rib 306 are respectively arranged on the second mold cavity 203 and the fourth mold cavity 302 of the upper mold corresponding to it during the mold clamping and injection molding process. The first reinforcing rib 206 and the second reinforcing rib 306 are opened on the bottom surface of the second mold cavity 203 and the fourth mold cavity 302, so that they are recessed in the bottom surface of the corresponding mold cavity. During the mold clamping and injection molding process, the injection molding material will be filled in the first reinforcing rib 206 and the second reinforcing rib 306. On the surface of the injection molded fuse base, multiple side-by-side rib skeletons protruding from its surface will be formed. This skeleton can strengthen the surface to offset part of the tensile force of the injection molding material contracting inward in the case of shrinkage. Therefore, the depressions formed by shrinkage on the surface of the injection molded fuse base are greatly reduced, and the shrinkage rate of the product can be maintained within the standard range.

[0052] Among them, the first reinforcing rib 206 and the second reinforcing rib 306 arranged on the second mold cavity 203 and the fourth mold cavity 302 are Figure 3 、 4 shown as multiple horizontally arranged side by side, or can be as Figure 7 、 8A plurality of vertically arranged side by side as shown, which can increase the strength of the main surface of the fuse base, so that the tensile force that can cause the injection molding material to shrink inward can be offset, thereby greatly reducing the shrinkage rate and ensuring the dimensional requirements and quality requirements of the product.

[0053] Furthermore, as Figures 6 - 7 shown, in order to improve the separation efficiency of the fuse base on the fixture after injection molding, a stripping device 120 capable of rapid material removal is also provided on the fixture. The stripping device 120 includes a stripping plate 121. A through hole for the fork head 111 to pass through is provided on the stripping plate 121. After the fork head 111 passes through this through hole, it is in close contact with the side surface of the fixture cross beam 110. At both ends of the stripping plate 121, a pull rod 122 is fixedly provided. The pull rod 122 is parallel to the fork head 111 along the axis and extends in the direction towards the fixture cross beam 110. Correspondingly, a through hole for the pull rod 122 to pass through and extend out of the other side surface of the fixture cross beam 110 is provided on the fixture cross beam 110. At the top of the pull rod 122 extending out of the fixture cross beam 110, a pull rod cap 123 with a diameter larger than that of the pull rod 122 and a spiral spring 124 sleeved on a section of the pull rod 122 extending out of the fixture cross beam 110 are fixedly provided. The spiral spring 124 is compressed by the pull rod cap 123 and the fixture cross beam 110, so that the stripping plate 121 is close to the fixture cross beam 110 under the action of the spiral spring 124, and the fork head 111 is always exposed outside the stripping plate 121, so as to facilitate the installation of the terminal 501 of the fuse on the fork head 111. When it is necessary to separate the fuse base, the pull rod 122 on one side of the fixture cross beam 110 is pushed in the other direction, and the spiral spring 124 is compressed, so that the stripping plate 121 moves away from the fixture cross beam 110 under the push of the pull rod 122, and then the fuse base on the fork head 111 is separated.

[0054] Furthermore, to further increase the efficiency of rapid material removal and perform material removal with minimal manual participation, as Figure 1 、 5As shown, an automatic stripping structure is also provided on an injection mold for an automotive fuse holder according to the present invention. The structure includes: a mounting table 210 provided on the bottom mold 200, an inclined surface that slopes downward and outward from the bottom mold 200 is provided on the tabletop of the mounting table 210, and a positioning post 211 protruding from the inclined surface is provided on the inclined surface; a positioning hole 113 opened on the fixture crossbeam 110 for the positioning post 211 to penetrate, so that the fixture can be installed on the mounting table 210 through the positioning post 211 penetrating into the positioning hole 113; a driving wheel 125 provided at both ends of the separating plate 121, and the driving wheel 125 is installed on the separating plate 121 through a rotating shaft 126 that rotates in cooperation with it; a pushing plate 305 provided on the upper mold 300, the pushing plate 305 corresponds to the driving wheel 125, the positive projection of the pushing plate 305 downward covers the driving wheel 125, and an inclined surface opposite to the inclined direction of the inclined surface of the mounting table 210 is provided on the lower surface of the pushing plate 305.

[0055] When it is necessary to separate the fuse holder on the fixture, the fixture is installed on the mounting table 210 through the positioning post, and the end with the fuse holder installed is oriented towards the inclined direction of the top surface of the mounting table 210, that is, the fuse holder is located on the lower side of the inclined surface of the mounting table 210. When the upper mold 300 closes the mold for injection molding, the upper mold 300 moves downward under the drive of the injection molding machine to perform a mold closing action with the bottom mold 200, so that the pushing plate 305 installed on the upper mold 300 moves towards the fixture on the mounting table 210. Then, under the action of the inclined surface on the lower surface of the pushing plate 305, the driving wheel 125 installed on the separating plate 121 is continuously pushed downward along the inclined surface of the mounting table 210. Furthermore, the separating plate 121 moves under the action of the driving wheel 125, so that the fuse holder installed on the fork head 111 is separated from the fork head under the action of the separating plate 121, thereby achieving automatic stripping.

[0056] For those skilled in the art, various corresponding changes and deformations can be obtained according to the structure and principle disclosed in the present invention, and all such changes and deformations fall within the protection scope of the present invention.

Claims

1. An injection mold for an automotive fuse holder, characterized in that, Including: A fixture for carrying the fuse base substrate. The fixture includes a fixture cross beam and a fork head disposed on the fixture cross beam and inserted into the fuse base terminal to form an interference fit therewith, and the length of the fork head is greater than the depth of the fuse base terminal; A bottom mold. On the surface of the bottom mold for mold closing, a first mold cavity for the first injection molding of the fuse base is provided. The first mold cavity has a first fork head channel for the fork head to extend into the first mold cavity. On the surface of the bottom mold for mold closing, a second mold cavity for the second injection molding of the fuse base is also provided. The second mold cavity is shaped like the first mold cavity, and the area of the opening of the second mold cavity is larger than the area of the opening of the first mold cavity. The second mold cavity has a second fork head channel for the fork head to extend into the second mold cavity. The bottom mold is further provided with a first runner located between the first mold cavity and the second mold cavity for injecting injection plastic; An upper mold for cooperating with the bottom mold to close the mold for injection molding the fuse base. On the surface of the upper mold for mold closing, a third mold cavity for the first injection molding of the fuse base and for closing the mold with the first mold cavity is provided. On the surface of the upper mold for mold closing, a fourth mold cavity for the second injection molding of the fuse base and for closing the mold with the second mold cavity is also provided. A second runner is disposed between the third mold cavity and the fourth mold cavity. The second runner cooperates with the first runner and is for injecting injection plastic. The injection end of the second runner has water inlets respectively leading into the third mold cavity and the fourth mold cavity; The fixture is provided with a stripping device, and the stripping device includes A stripping plate having a through hole for the fork head to pass through. The stripping plate is sleeved on the fork head. At both ends of the stripping plate, pull rods are fixedly provided. The pull rods are parallel to the fork head along the axial direction and extend towards the fixture cross beam. Through holes for the pull rods to extend through are provided on the fixture cross beam. At the top end of the pull rod extending out of the fixture cross beam, a pull rod cap with a diameter larger than that of the pull rod is installed, and a helical spring is sleeved on a section of the pull rod extending out of the fixture cross beam. The helical spring is pressed by the pull rod cap and the fixture cross beam; The injection mold further has an automatic stripping structure, and the automatic stripping structure includes: An installation table provided on the bottom mold. The top end of the installation table has an inclined surface inclined downward towards the outside of the bottom mold, and positioning posts are provided on the inclined surface; A positioning hole opened on the fixture cross beam for the positioning post to pass through, so that the fixture is installed on the installation table by the positioning post passing through the positioning hole; Pushing wheels provided at both ends of the fixture stripping plate. The pushing wheels are connected to the stripping plate through rotating shafts rotatably engaged therewith; A push plate provided on the upper mold. The downward orthographic projection of the push plate covers the pushing wheels, and the lower surface of the push plate has an inclined surface with an inclined direction opposite to that of the inclined surface of the installation table; The fourth mold cavity is shaped like the third mold cavity, and the area of the opening of the fourth mold cavity is larger than the area of the opening of the third mold cavity.

2. The injection mold for an automotive fuse holder according to claim 1, characterized in that, A plurality of first reinforcing ribs are arranged within the second mold cavity and are juxtaposed above the bottom surface, and the first reinforcing ribs are recessed from the bottom surface of the second mold cavity; a plurality of second reinforcing ribs are arranged within the fourth mold cavity and are juxtaposed above the bottom surface, and the second reinforcing ribs are recessed from the bottom surface of the fourth mold cavity.

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