CN216968461U

CN216968461U - Injection mold for automobile fuse holder

Info

Publication number: CN216968461U
Application number: CN202121258127.5U
Authority: CN
Inventors: 彭高
Original assignee: Dongguan Yuanhui Electric Appliance Co ltd
Current assignee: Dongguan Yuanhui Electric Appliance Co ltd
Priority date: 2021-06-07
Filing date: 2021-06-07
Publication date: 2022-07-15
Anticipated expiration: 2031-06-07

Abstract

An injection mold for an automobile fuse holder, comprising: the fixture is used for bearing the fuse holder base body; the bottom die is provided with a first die cavity for performing first injection molding on the fuse holder on the surface of the bottom die for die assembly, a second die cavity for performing second injection molding on the fuse holder on the surface of the bottom die for die assembly, and a first runner, wherein the first runner is positioned between the first die cavity and the second die cavity and used for injecting injection molding materials; and the upper die is matched with the bottom die to carry out die assembly so as to carry out injection molding on the fuse holder. The fuse seat is sequentially injected in the first die cavity and the second die cavity, so that the time for transferring to the second die cavity after the first injection is shortened, the loss of the temperature in the transferring process is reduced, and the deformation of the injection molding product is prevented.

Description

Injection mold for automobile fuse holder

Technical Field

The utility model belongs to the technical field of injection molding processing, and particularly relates to an injection mold for an automobile fuse holder.

Background

The automobile fuse holder is a base for installing a fuse in an automobile electrical appliance, and is used for transmitting driving information to each part of an automobile body.

The automobile fuse seat is mostly formed by injection molding at present, and the injection molding is a process for producing a part made of thermoplastic rubber or thermosetting plastic, namely, the plastic is heated and melted in a charging barrel of an injection molding machine, and then is injected into a closed mold with lower temperature at a high speed through a nozzle of the charging barrel, and after cooling and shaping for a certain time, a product can be obtained.

At present, due to the fact that the market has higher and higher requirements on the safety performance of automobiles, especially under the condition that the utilization rate of new energy automobiles is higher and higher, the requirements on fuse holders are more and more prominent, and the requirements on sufficient strength and precise size are required. When the fuse holder is injection molded, the fuse holder base body is injection molded on the fuse holder base body, and the fuse holder base body is covered in the fuse holder base body, so that corresponding requirements are met, as shown in fig. 1, the fuse holder base body comprises two terminals 501 connected with two ends of a fuse, and a terminal body 500 for fixedly mounting the terminals 501, two ends of the terminal body 500 are used for leading out the two terminals 501, in the current injection molding process, one-time injection molding is usually performed on the fuse holder base body, but due to the principle of thermal expansion and cold contraction, the surface of an injection molded product can shrink, the shrinking part forms a depressed area due to the inward shrinkage of a surface injection molding material, the depressed area enables the product after injection molding to shrink in a certain size, so that the size precision is influenced, and simultaneously, due to the change of the distance between the two terminals in the cooling shrinkage process after injection molding, thus, the installation of the automobile fuse is seriously influenced or the safety risk is brought, the current solution of the condition is usually to replace the material with higher stability, so that the size deformation of the product after injection molding is smaller, but the production cost is greatly increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides a mold for injection molding of an automobile fuse holder, aiming at the defect that in the process of injection molding production and processing of the fuse holder in the prior art, the whole size is changed due to shrinkage of hot-melt injection molding materials during cooling.

The technical scheme is as follows:

a injection mold that is used for flexible circuit to cover TPU outside centering includes:

the utility model provides an injection mold for automobile fuse seat which characterized in that includes:

the fixture is used for bearing the fuse holder base body and comprises a fixture cross beam and a fork head which is arranged on the fixture cross beam, penetrates through the fuse holder terminal and forms interference fit with the fuse holder terminal, and the length of the fork head is greater than the depth of the fuse holder terminal;

the bottom die is provided with a first die cavity for performing first injection molding on the fuse holder on the surface of the bottom die for die assembly, the first die cavity is provided with a first fork passage for enabling the fork to extend into the first die cavity, a second die cavity for performing second injection molding on the fuse holder is further arranged on the surface of the bottom die for die assembly, the second die cavity is profiled with the first die cavity, the area of an opening of the second die cavity is larger than that of an opening of the first die cavity, the second die cavity is provided with a second fork passage for enabling the fork to extend into the second die cavity, the bottom die is further provided with a first runner, and the first runner is located between the first die cavity and the second die cavity and used for injecting injection molding materials;

the upper die is used for matching with the bottom die to carry out die assembly so as to carry out injection molding on the fuse holder, a third die cavity used for carrying out first injection molding on the fuse holder and carrying out die assembly on the first die cavity is arranged on the surface of the upper die used for matching the dies, a fourth die cavity used for carrying out second injection molding on the multiple fuse holders and carrying out die assembly on the second die cavity is further arranged on the surface of the upper die used for matching the dies, a second runner is further arranged between the third die cavity and the fourth die cavity, the second runner is matched with the first runner and is used for injection molding materials, and the ejection end of the second runner is provided with a water gap which is respectively communicated with the third die cavity and the fourth die cavity.

Preferably, the second mold cavity and the first mold cavity are in copying shape, the area of the opening of the second mold cavity is larger than that of the opening of the first mold cavity, the fourth mold cavity and the first mold cavity are in copying shape, and the area of the opening of the fourth mold cavity is larger than that of the opening of the third mold cavity.

Preferably, the jig is provided with a stripping device, and the stripping device comprises

The tool beam comprises a separation plate, the separation plate is provided with a through hole for the fork head to pass through, the separation plate is sleeved on the fork head, pull rods are fixedly arranged at two ends of the separation plate, the pull rods are parallel to the fork head along the axial direction and extend towards the direction of the tool beam, a through hole for the pull rod to extend out is formed in the tool beam, a pull rod cap with the diameter larger than that of each pull rod is installed at the top end of the tool beam, a spiral spring is sleeved on one section of the pull rod extending out of the tool beam, and the spiral spring is compressed by the pull rod cap and the tool beam.

Preferably, injection mold still has automatic material structure of taking off, automatic material structure of taking off including:

the mounting table is arranged on the bottom die, the top end of the mounting table is provided with an inclined plane which inclines towards the lower part of the outer side of the bottom die, the positioning column is arranged on the inclined plane,

a positioning hole which is arranged on the jig cross beam and is used for the positioning column to penetrate through, so that the jig is arranged on the mounting table by penetrating the positioning column into the positioning hole,

the pushing wheels are arranged at two ends of the jig separation plate and are connected with the separation plate through rotating shafts which are in rotating fit with the pushing wheels,

the push plate is arranged on the upper die, the downward orthographic projection of the push plate covers the push wheel, and the lower surface of the push plate is provided with an inclined plane opposite to the inclined plane of the mounting table in the inclined direction.

Compared with the prior art, the utility model has the beneficial effects that: the upper die and the bottom die are provided with two die cavities with different volumes, so that the fuse holder can be subjected to two-section injection molding, and the die cavities for two-time injection molding are arranged on one bottom die or the upper die, the time required to perform the changeover of the fuse holder between some of the first and second die cavities is short, so that the temperature loss during the changeover can be greatly reduced, the inner die body which is injected for the first time in the process of the second injection molding also has higher temperature, so the probability of shrinkage is greatly reduced by the inner die body which is injected for the first time in the process of cooling the fuse holder after the injection molding, and then the fuse seat after the second injection molding is supported by the inner film die body in the cooling process, so that the shrinkage rate is greatly reduced, and the size and the product quality of the injection molded fuse seat are further ensured.

Simultaneously, take off the material device and take off the material structure automatically being provided with for can be quick break away from the tool after the fuse seat is moulded plastics and is accomplished, and take off the effect of material structure in the automation and realize breaking away from on the tool quick convenient fuse seat realization of moulding plastics to the completion of moulding plastics in-process of moulding plastics, can realize reducing the condition of artifical participation and directly accomplish automatic material work of taking off, reduced artificial working strength, saved the manual work and reduced the cost of labor.

The utility model is further described with reference to the drawings and embodiments in the following description.

Drawings

FIG. 1 is a schematic view of the construction of a fuse holder base.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a first schematic view of a base film structure according to the present invention.

Fig. 4 is a first schematic structural diagram of an upper mold in the utility model.

Fig. 5 is a front view of a jig according to the present invention.

Fig. 6 is a side view of a jig of the present invention.

Fig. 7 is a first schematic view of a base film structure according to the present invention.

Fig. 8 is a first structural schematic diagram of an upper die in the utility model.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and back) in the embodiments of the present invention are only used for explaining the relative position relationship between the components in a specific posture (as shown in the drawings), the motion situation, and the like, and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions of "first", "second", and the like provided in the embodiments of the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

In order to avoid or reduce the shrinkage of an injection molding material when the injection molding material is cooled after injection molding when an automobile fuse holder is subjected to injection molding, avoid the change of the space between two terminals when the injection molding material is cooled, and enable the overall size of a finished product to meet the standard, wherein the space between the two terminals is matched with a fuse, the mold for injection molding of the fuse holder adopts the following technical scheme.

As shown in fig. 2 to 6, the mold comprises a fixture for carrying a fuse holder base, the fixture comprises a fixture beam 110 and a fork 111 disposed on the fixture beam 110 for inserting a terminal 501 to form an interference fit therewith, the prong 111 is inserted into the terminal 501 to connect the fuse holder base to the fixture for easy injection molding, wherein the length of prong 111 is greater than the depth of terminal 501, i.e., prong 111 has a length of prong 111 exposed after insertion into terminal 501, the exposed part of the fork 111 can extend the fuse substrate mounted on the fork 111 into the first cavity 201 or the second cavity 203 when the bottom film 200 and the upper mold 300 are subjected to matched mold injection, the exposed prongs of this segment are located outside of the first mold cavity 201 or the second mold cavity 203 and are clamped by the upper mold 300 and the carrier film 200.

The mold has a bottom film 200 and an upper mold 300 positioned above the bottom film 200.

A first mold cavity 201 for performing first injection molding on the fuse holder and a second mold cavity 203 for performing second injection molding on the fuse holder are formed on the surface of the bottom film 200 for mold clamping, a first flow channel 204 for injecting injection molding materials is further formed between the first mold cavity 201 and the second mold cavity 203, and a first fork channel 202 and a second fork channel 205 which are matched with the exposed forks and allow the forks to pass through are formed on one sides of the first mold cavity 201 and the second mold cavity 203.

A third mold cavity 301 which is used for performing first injection molding on a fuse holder and corresponds to the first mold cavity 201 in a matching manner is arranged on the matched surface of the upper mold 300 for performing mold closing with a bottom film, similarly, a fourth mold cavity 302 which corresponds to the second mold cavity 203 in a matching manner is also arranged, a second flow channel 303 which corresponds to the first flow channel 204 in a matching manner is also arranged, a water gap 304 which is respectively communicated with the third mold cavity 301 and the fourth mold cavity 302 is also arranged at the ejection end of the second flow channel 303, and is used for ejecting molten injection molding materials into the third mold cavity 301 and the fourth mold cavity 302, and then the molten injection molding materials enter the first mold cavity 201 and the second mold cavity 203 to perform injection molding on the fuse holder.

Specifically, the second cavity 203 and the first cavity 201 are arranged in a copying manner, the opening area of the second cavity 203 is larger than the opening area of the first cavity 201, the same fourth cavity 302 and the same third cavity 301 are arranged in a copying manner, and the opening area of the fourth cavity 302 is larger than the opening area of the third cavity 301.

The utility model discloses a mold for an automobile fuse holder, which adopts the following process to carry out injection molding on a fuse base body, and comprises the following steps:

s1, after the fuse substrate arranged on the jig is placed in the first die cavity 201, the upper die 300 and the bottom film 200 are closed to perform the first injection molding on the fuse base;

s2, immediately placing the fuse holder subjected to the first injection molding into a second mold cavity 203 after demolding, and carrying out mold assembly on the upper mold 300 and the bottom film 200 to carry out second injection molding on the fuse holder;

s3, demolding the fuse subjected to the second injection molding, and cooling the fuse at room temperature;

in the injection molding process of the fuse holder for the automobile, as shown in fig. 5, the prongs 111 of the jig are previously set in a shape in which the terminals 501 of the fuse base are matched with each other, and the prongs 111 of the fixture are inserted over the terminals 502 of the fuse base, so that the base is secured to the fixture, and the substrate fixed on the fixture is placed in the first mold cavity 201 of the bottom film 200, the first fork passage 202 provided on the first mold cavity 201 accommodates the exposed section of the fork 111 when connecting with the terminal 501, thereby facilitating the mold closing and injection molding of the upper mold 300 and the bottom film 200, clamping the exposed fork 111 by the upper mold 300 and the bottom film which are closed, so that the fuse base body is located at the middle position of the first mold cavity 201 and the third mold cavity 301 after mold closing, and the rest space of the first mold cavity 201 and the third mold cavity 301 which are closed is used for injecting injection molding material for injection molding processing.

As shown in fig. 3 to 4, a water gap 304 is opened on the second flow channel 303 of the upper mold 300, and the water gap is respectively communicated with the third mold cavity 301 and the fourth mold cavity 302 for injecting injection molding material into the third mold cavity 301 and the fourth mold cavity 302, when the upper mold 300 and the bottom film 200 are subjected to mold closing and injection molding, the injection molding material is injected into the space of the first mold cavity 201 and the third mold cavity 301 which are closed by the water gap 304 for primary injection molding, and an inner mold body of the fuse holder is obtained.

After the first injection molding process is completed, the jig and the inner mold body of the fuse seat are taken out from the first mold cavity 201, and quickly placed in second cavity 203 of carrier film 200, when it is designed, second cavity 203 and first cavity 201 are formed into a form, and the area at the opening of the second mold cavity 203 is larger than the area at the opening of the first mold cavity 201, and its internal volume is larger than the internal volume of the first mold cavity 201, so that, when the inner mold body of the fuse holder is placed in the second mold cavity 203, the second mold cavity 203 has a vacant space, that is, when the upper mold 300 and the bottom mold 200 are closed, the periphery of the inner mold body of the fuse holder located in the second mold cavity 203 and the fourth mold cavity 302 after the closing has moved to allow the injection molding material to be injected for injection molding, that is, the inner mold body of the fuse holder is subjected to the second injection molding.

The second injection molding is carried out on the inner mold body of the fuse holder formed after the first injection molding is carried out on the fuse holder, so that the inner mold body is not contacted and cooled with room temperature or cold air for a long time, the temperature of the inner mold body is higher, the size of the inner mold body cannot be deformed, and the second injection molding is carried out on the inner mold body under the state, so that the rubber plastic material with higher temperature is injected on the inner mold body again.

Because the interval time of carrying out first injection molding and moulding plastics for the second time is shorter, so the temperature of the internal mold body of moulding plastics for the first time is not cooled, make when moulding plastics for the second time, the injection molding material of molten state can be better mould plastics integratively with the internal mold body, simultaneously, the second time of moulding plastics on the internal mold body that has solidified but the temperature does not descend, make, fuse seat after twice moulding plastics is when cooling, the internal mold body is because after the reheating of moulding plastics for the second time, cooling rate is slower, the emergence of the deformation of the internal mold body has been avoided greatly, simultaneously, because accomplish on the internal mold body when moulding plastics for the second time, the volume of moulding plastics is less, and still have a cooled and stable internal mold body in its inside, so, the product deformation volume after moulding plastics for the second time is less.

The first die cavity 201 and the third die cavity 301 for first injection molding and the second die cavity 203 and the fourth die cavity 302 for second injection molding are respectively arranged on the bottom film 200 and the upper die 300, so that a fuse holder base body needing injection molding can be converted between stations for first injection molding and second injection molding without any intermediate part after the first injection molding is finished, the time spent in the process of converting the fuse holder base body is short, the loss of temperature on an inner die body of a fuse holder in the conversion process can be greatly reduced, and the deformation of the size of the inner die body is guaranteed to be within the specified standard.

Simultaneously, all be provided with simultaneously on die block or last mould and be used for carrying on two die cavities that the compound die was moulded plastics for the first time and the second time, can carry out convenient and fast's the second through carrying on same mould after moulding plastics for the first time and mould plastics to the fuse seat that will mould plastics is carrying on for the first time to the time that this in-process of moulding plastics of second is short, can greatly reduced the time that contacts the shrink phenomenon that brings through the internal mold die body of the fuse seat that the first time formed of moulding plastics and cold air, will reduce because the internal mold die body deformation that the shrink caused. Meanwhile, as the die cavities for the first injection molding and the second injection molding are arranged on the same die, the manual use can be greatly reduced, the investment on the manual cost is reduced, and the production cost is reduced.

Furthermore, a first reinforcing rib 206 and a second reinforcing rib 306 are respectively arranged on the second cavity 203 and a fourth cavity 302 of the upper mold corresponding to the second cavity during the mold closing and injection, wherein the first and

second reinforcement ribs

206, 306 are opened above the bottom surfaces of the second and

fourth cavities

203, 302, such that they are recessed in the bottom surfaces of the corresponding cavities, such that, during the clamping process, the first rib 206 and the second rib 306 are filled with molding compound, a plurality of side-by-side rib skeletons protruding from the surface of the fuse holder are formed on the surface of the fuse holder after injection molding, the framework can strengthen the surface and counteract the pulling force of inward shrinkage of a part of injection molding material under the condition of shrinkage, so that the depression formed by shrinkage of the injection molded fuse seat on the surface is greatly reduced, and the shrinkage of a product can be kept within a standard range.

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 a plurality of transverse side-by-side ribs as shown in fig. 3 and 4, and also can be a plurality of vertical side-by-side ribs as shown in fig. 7 and 8, so that the strength of the main surface of the fuse holder can be increased, the pulling force of the inward shrinkage of the injection molding material can be counteracted, the shrinkage is greatly reduced, and the size requirement and the quality requirement of the product are ensured.

Further, as shown in fig. 6-7, in order to improve the separation efficiency of the fuse holder on the jig after injection molding, a stripping device 120 capable of stripping material quickly is further provided on the jig, the stripping device 120 includes a stripping plate 121, a through hole for the fork 111 to pass through is provided on the stripping plate 121, the fork 111 is closely contacted with the side surface of the jig beam 110 after passing through the through hole, pull rods 122 are further fixedly provided at both ends of the stripping plate 121, the pull rods 122 are axially parallel to the fork 111 and extend out in the direction of the jig beam 110, correspondingly, a through hole for the pull rod 122 to pass through and extend out of the side surface of the jig beam 110 is provided on the jig beam 110, another pull rod cap 123 having a diameter larger than that of the pull rod 122 and a coil spring 124 sleeved on a section of the jig beam 110 from which the pull rod 122 extends out, the coil spring 124 is pressed by the pull rod cap 123 and the fixture beam 110, so that the separation plate 121 is close to the fixture beam 110 under the action of the coil spring 124, so that the fork 111 is always exposed outside the separation plate 121, and the terminal 501 of the fuse is mounted on the fork 111. when the fuse holder needs to be separated, the pull rod 122 on one side of the fixture beam 110 is pushed in the other direction, and the coil spring 124 is compressed, so that the separation plate 121 moves in the direction away from the fixture beam 110 under the pushing of the pull rod 122, and the fuse holder on the fork 111 is separated.

Further, in order to further increase the efficiency of rapid stripping, stripping is performed with the participation of manpower as much as possible, as shown in fig. 1 and 5, the injection mold for the automobile fuse holder provided by the present invention further has an automatic stripping structure, and the structure includes: a mounting table 210 disposed on the bottom film 200, wherein a slant surface inclined to the lower part of the outer side of the bottom film 200 is disposed on the top surface of the mounting table 210, and a positioning column 211 protruding from the slant surface is disposed on the slant surface; a positioning hole 113 provided on the jig beam 110 for the positioning post 211 to penetrate through, so that the jig can be mounted on the mounting table 210 by the positioning post 211 penetrating into the positioning hole 113; push wheels 125 provided at both ends of the disengagement plate 121, the push wheels 125 being mounted on the disengagement plate 121 by a rotation shaft 126 in rotational engagement therewith; a push plate 305 disposed on the upper mold 300, the push plate 305 corresponding to the push wheel 125, and the push plate 305 covering the push wheel 125 by a downward orthographic projection, and having a slope opposite to the slope of the mounting table 210 on the lower surface of the push plate 305.

When the fuse seat on the jig needs to be detached, the jig is mounted on the mounting table 210 through the positioning column, and the end where the fuse holder is mounted is directed toward the inclination of the top surface of the mounting table 210, that is, the fuse holder is located at the lower side of the inclined surface of the mounting table 210, and when the upper mold 300 is closed for injection molding, the upper mold 300 moves downward under the drive of the injection molding machine to perform a mold closing operation with the base film 200, the push plate 305 mounted on the upper mold 300 is moved toward the jig on the mounting table 210, so that, under the action of the inclined surface of the lower surface of the push plate 305, the push wheel 125 mounted on the release plate 121 is continuously pushed downwards along the inclined surface of the mounting table 210, further, the disengagement plate 121 is moved by the pushing wheel 125, so that the fuse holder installed above the fork 111 is disengaged from the fork by the disengagement plate 121, thereby performing automatic stripping.

Various other modifications and alterations of the disclosed structure and principles of the utility model will become apparent to those skilled in the art from this disclosure, and all such modifications and alterations are intended to be within the scope of the utility model.

Claims

1. The utility model provides an injection mold for automobile fuse seat which characterized in that includes:

the upper die is used for matching with the bottom die to perform die assembly so as to perform injection molding on the fuse holder, a third die cavity used for performing first injection molding on the fuse holder and matching with the first die cavity is formed in the surface of the upper die used for matching the die, a fourth die cavity used for performing second injection molding on multiple fuse holders and matching with the second die cavity is further formed in the surface of the upper die used for matching the die, a second runner is further configured between the third die cavity and the fourth die cavity, the second runner is matched with the first runner and is used for injection molding materials, and the injection end of the second runner is provided with a water gap which is respectively communicated into the third die cavity and the fourth die cavity.

2. The injection mold for an automobile fuse holder as claimed in claim 1, wherein the second cavity is formed to be substantially conformal to the first cavity, and the second cavity has an opening area larger than the first cavity, and the fourth cavity is formed to be substantially conformal to the third cavity, and the fourth cavity has an opening area larger than the third cavity.

3. The injection mold according to claim 1, wherein the fixture is provided with a stripping device, and the stripping device comprises a stripping device

4. The injection mold for the automobile fuse holder according to claim 3, wherein the injection mold further has an automatic stripping structure, and the automatic stripping structure comprises:

5. The injection mold for an automobile fuseholder according to claim 1, wherein a plurality of first reinforcing ribs are provided in the second cavity and arranged above the bottom surface, the first reinforcing ribs being recessed in the bottom surface of the second cavity; second reinforcing ribs arranged side by side above the bottom surface are provided inside the fourth cavity, the second reinforcing ribs being recessed in the bottom surface of the fourth cavity.