CN219834674U - Injection molding shell - Google Patents

Abstract

The utility model discloses an injection molding shell, which comprises a shell body and a metal connecting part, wherein the metal connecting part is connected with the shell body through an integral injection molding process, the outer wall surface of the metal connecting part comprises an upstream wall surface and a downstream wall surface, the upstream wall surface and the downstream wall surface are oppositely arranged in the flowing direction of injection molding fluid, the intersecting line of the upstream wall surface and the downstream wall surface is two parallel edges, the surface passing through the two edges is a reference surface, the downstream wall surface is a convex surface part protruding along the flowing direction, and the maximum distance H between the downstream wall surface and the reference surface and the distance D between the two edges satisfy the following relation: h > D/2. In the above scheme, the protrusion degree of the back flow wall surface along the flowing direction is larger than the cylindrical surface taking the distance D as the diameter, when the back flow wall surface is converged through each split flow of the head-on flow wall surface, the converging angle can be increased, the bonding strength of each split flow of the side where the back flow wall surface is located can be improved, so that the injection molding strength around the metal connecting part is improved, and the quality and the service life of the injection molding shell can be ensured.

Description

Injection molding shell

Technical Field

The utility model relates to the technical field of injection molding devices, in particular to an injection molding shell.

Background

In the field of automobiles and the like, there are a large number of injection molded housings for carrying high-voltage air cushions, housing or housing of electrical components and the like.

The injection molding shell comprises a shell body and a metal connecting part, the metal connecting part and the injection molding shell are connected through an integral injection molding process, and the metal connecting part is used for being matched with connecting pieces in the forms of screws and the like to realize the installation and fixation of the injection molding shell. In the related art, the outer wall surface of the metal connecting part is cylindrical, the outer wall surface of the metal connecting part comprises an upstream wall surface and a back flow wall surface, in the injection molding process, injection molding fluid can flow to the upstream wall surface, flow division occurs at the upstream wall surface, then flow collection is performed at the back flow wall surface, and finally injection molding connection between the metal connecting part and the injection molding shell is realized. However, in the above scheme, the bonding strength of the injection molding fluid on the back flow wall surface side is relatively low, so that the shell body has a weak structural strength area, and in the use process, the weak structural strength area is easy to break and other damage, so that the service life is low.

Therefore, how to provide a solution to overcome or alleviate the above-mentioned drawbacks is still a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The utility model aims to provide an injection molding shell, which has relatively high injection molding strength on the side where the back flow wall surface is located, and is beneficial to improving the quality and prolonging the service life of the injection molding shell.

In order to solve the technical problems, the utility model provides an injection molding shell, which comprises a shell body and a metal connecting part, wherein the metal connecting part and the shell body are connected through an integral injection molding process, the outer wall surface of the metal connecting part comprises an upstream wall surface and a downstream wall surface, the upstream wall surface and the downstream wall surface are oppositely arranged in the flowing direction of injection molding fluid, the intersecting line of the upstream wall surface and the downstream wall surface is two parallel edges, the surfaces passing through the two edges are reference surfaces, the downstream wall surface is a convex surface part protruding along the flowing direction, and the maximum distance H between the downstream wall surface and the reference surfaces and the distance D between the two edges satisfy the following relation: h > D/2.

By adopting the scheme, the protruding degree of the back flow wall surface along the flowing direction is larger than the cylindrical surface taking the distance D as the diameter, when the back flow wall surface is converged through each split flow of the head-on flow wall surface, the converging angle between the converging marks can be greatly increased, the bonding strength of each split flow of the side where the back flow wall surface is located can be improved, and then the existence of a weak area of the structural strength can be reduced, so that the injection molding strength around the metal connecting part is improved, and the quality and the service life of the injection molding shell can be ensured.

Optionally, the back flow wall surface is a smooth curved surface.

Optionally, the back flow wall surface includes a first arc surface portion, two straight surface portions and two second arc surface portions, two ends of the first arc surface portion are respectively connected with two straight surface portions, two straight surface portions are respectively connected with two second arc surface portions, and two second arc surface portions are respectively connected with two ends of the head-on flow wall surface.

Optionally, the first arc surface portion and the second arc surface portion are arc cylindrical surfaces.

Optionally, a symmetry plane is provided between two edges, the two edges are symmetrical about the symmetry plane, and the back flow wall is symmetrical about the symmetry plane.

Optionally, the upstream wall surface is a smooth curved surface.

Optionally, the shell body includes a main body portion and an ear plate portion, the main body portion is formed with a cavity, the ear plate portion is located on an outer wall surface of the main body portion, and the metal connection portion is located on the ear plate portion.

Optionally, the metal connection part is provided with a connection hole.

Optionally, the metal connection part is further provided with a positioning hole.

Optionally, the number of the metal connection parts is a plurality, and the diameters of the connection holes of the metal connection parts are the same.

Drawings

FIG. 1 is a schematic view of a metal connection part and a shell connection part in the related art;

FIG. 2 is a schematic view of an embodiment of an injection molded housing according to the present utility model;

FIG. 3 is a top view of FIG. 2;

fig. 4 is a schematic structural view of the connection between the metal connection part and the shell in fig. 2.

The labels in fig. 1 are illustrated as follows:

01 shell body, 02 metal connecting part, 021 upstream wall surface, 022 back stream wall surface and 023 converging mark.

The reference numerals in fig. 2-4 are illustrated as follows:

1 a shell body, 11 a main body part, 111 a cavity, 12 an ear plate part and 121 a converging mark;

2 metal connecting parts, 21 upstream wall surfaces, 22 back flow wall surfaces, 221 first arc surface parts, 222 straight surface parts, 223 second arc surface parts, 23 connecting holes and 24 positioning holes;

reference plane A and symmetry plane B.

Detailed Description

In order to make the technical solution of the present utility model better understood by those skilled in the art, the present utility model will be further described in detail with reference to the accompanying drawings and specific embodiments.

In embodiments of the present utility model, the terms "first," "second," and the like are used 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. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

In describing embodiments of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and for example, "connected" may be either detachably connected or non-detachably connected; may be directly connected or indirectly connected through an intermediate medium.

References to orientation terms, such as "inner", "outer", etc., in the embodiments of the present utility model are only with reference to the orientation of the drawings, and thus, the use of orientation terms is intended to better and more clearly describe and understand the embodiments of the present utility model, rather than to indicate or imply that the apparatus or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the embodiments of the present utility model.

In the description of embodiments of the utility model, the term "plurality" refers to two or more. In addition, when "a plurality" is used to indicate the number of a certain number of components, the number of the components is not related to each other.

In the description of embodiments of the present utility model, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a metal connection portion and a shell connection portion in the related art.

As shown in fig. 1, in the related art, an injection molded case includes a case body 01 and a metal connection portion 02. The outer wall surface of the metal connection portion 02 includes an upstream wall 021 and a back flow wall 022, and the upstream wall 021 and the back flow wall 022 may be disposed opposite to each other in the flow direction of the injection fluid. The outer wall surface of the metal connection part 02 is a cylindrical surface, and accordingly, the upstream wall surface 021 and the back flow wall surface 022 of the metal connection part 02 are semi-cylindrical surfaces.

In the injection molding process, injection molding fluid can flow to the upstream wall 021 and can be split at the upstream wall 021 to form two or more streams; after crossing the upstream wall 021, the streams may merge at the downstream wall 022, and a merging trace 023 is simulated by a broken line in fig. 1, and a merging angle α may be formed between the two streams that merge together. Because the back flow wall 022 is a semi-cylindrical surface, when the material flows are converged, the converging angle alpha is smaller, the converging angle alpha is below 45 degrees at a specific position, so that the bonding strength of the material flow intersection is lower, and is only 1/2 or even lower of the strength of other positions (such as the side where the flow-incident wall 021 is located), so that a structural strength weak area is formed, and in the use process, the structural strength weak area is extremely easy to break and other damage, the service life is lower, and the normal use of the injection molding shell is seriously influenced.

In view of the above, the utility model provides a brand new injection molding shell, which increases the converging angle alpha by improving the structural shape of the back flow wall surface, so that the bonding strength of the material flow on the side of the back flow wall surface can be improved, the structural strength weak area can be reduced as much as possible, the quality of the injection molding shell can be improved, and the service life can be prolonged.

Specifically, referring to fig. 2-4, fig. 2 is a schematic structural diagram of an embodiment of an injection molding housing provided by the present utility model, fig. 3 is a top view of fig. 2, and fig. 4 is a schematic structural diagram of a connection portion between a metal connection portion and a housing body in fig. 2.

As shown in fig. 2 to 4, the present utility model provides an injection molded housing, which includes a housing body 1 and a metal connection part 2, wherein the metal connection part 2 and the housing body 1 are connected through an integral injection molding process.

The materials of the case body 1 and the metal connection part 2 are not limited herein, and in practical applications, those skilled in the art can determine the materials according to specific use requirements, etc. By way of example, the casing 1 may be of plastic material, such as polybutylene terephthalate (polybutylene terephthalate, PBT), polycarbonate (PC), polyethylene terephthalate (polyethylene terephthalate, PET), etc.; the metal connection portion 2 is made of a metal material, such as stainless steel material, copper material, or the like.

The housing 1 may include a main body portion 11 and an ear plate portion 12.

The body portion 11 is formed with a cavity 111, and the cavity 111 may serve as a receiving cavity for receiving the high-voltage air cushion, the electric components, and the like mentioned in the background art.

The ear plate portion 12 may be located on an outer wall surface of the main body portion 11, and the metal connection portion 2 may be located on the ear plate portion 12. The metal connection part 2 may be provided with connection holes 23, the connection holes 23 being used to fit connection members in the form of screws or the like to achieve mounting and fixing of the injection molded housing in a specific use environment, such as a vehicle environment.

It should be understood that in other implementations of the embodiment of the utility model, the housing 1 may also comprise only the main body 11, the construction is relatively simple, and the metal connection 2 may be provided directly to the main body 11, which also enables mounting and fixing of the injection-molded housing.

In practical use, the number of metal connection parts 2 may be plural, and the plural metal connection parts 2 may be distributed at different positions of the housing body 1, for example, the embodiment of fig. 2 and 3 shows a solution including four metal connection parts 2. The diameters of the connecting holes 23 of the metal connecting parts 2 can be completely consistent, so that the metal connecting parts 2 are not easy to misplace when being installed and arranged, and the efficiency of putting the metal connecting parts 2 in injection molding is improved. Of course, it is also possible that the metal connection portions 2 may have at least partially non-uniform hole diameters of the connection holes 23, and this may be determined in accordance with the mounting and use requirements of the injection-molded case.

In some alternative embodiments, the metal connection part 2 may be further provided with a positioning hole 24, and the positioning hole 24 may be a through hole or a blind hole. In specific practice, the mounting side of the injection molding housing (such as a vehicle floor and the like) may be provided with a positioning portion in the form of a boss and the like, and the positioning portion may be inserted into the positioning hole 24, so as to realize positioning assembly of the injection molding housing on the mounting side, and improve the mounting convenience of the injection molding housing.

By adopting the scheme, the metal connecting part 2 is provided with the special locating hole 24, and the locating assembly is realized by matching the locating part special for the installation side with the locating hole 24 without locating assembly by means of the connecting hole 23, so that the metal connecting part is not influenced by the concrete structure of the installation side connecting part, the installation side connecting part is not influenced by the locating assembly of the injection molding shell on the installation side no matter the stud or the screw hole (or the nut), and the smooth implementation of the locating assembly is ensured.

Referring to fig. 4, the outer wall surface of the metal connection part 2 includes an upstream wall surface 21 and a back flow wall surface 22. The upstream wall surface 21 and the downstream wall surface 22 are arranged opposite to each other in the flow direction of the injection fluid, the intersecting line of the upstream wall surface 21 and the downstream wall surface 22 is two parallel edges, the surface passing through the two edges is a reference surface a, and the downstream wall surface 22 is a convex surface portion protruding along the flow direction.

In the embodiment of the present utility model, the maximum distance H between the back flow wall surface 22 and the reference surface a and the distance D between the two edges satisfy the following relationship: h > D/2. In this way, the protruding degree of the back flow wall surface 22 along the flowing direction is larger than the cylindrical surface taking the distance D as the diameter, when the branches passing through the head-on wall surface 21 are converged on the back flow wall surface 22, the converging angle α between the converging traces 121 can be greatly increased, the bonding strength of the branches at the side of the back flow wall surface 22 can be improved, and then the existence of the weak area of the structural strength can be reduced, so as to improve the injection molding strength around the metal connecting portion 2, thereby ensuring the quality and the service life of the injection molding shell.

The embodiment of the present utility model is not limited to the specific structural form of the back flow wall surface 22, and in practical application, those skilled in the art may design according to specific needs, so long as the requirements of use can be met. Illustratively, the back flow wall 22 may be a combination of one or more of a straight face, a rounded face, an elliptical curved face, and the like.

In fact, the back flow wall 22 may be simulated by combining a certain simulation test in a specific design, so that the converging angle α may be larger than a set value to meet the set requirement of the bonding strength. The specific size of the set value can be determined according to practical use requirements, for example, the set value can be 135 degrees, so that the bonding strength of each split flow can be basically consistent with that of other positions (such as the side on which the upstream wall surface 21 is located).

The back flow wall surface 22 may be a smooth curved surface, so that the flow resistance of the injection molding fluid when flowing along the back flow wall surface 22 may be relatively small, which is beneficial to improving the smoothness of injection molding.

In some alternative embodiments, as shown in fig. 4, the back flow wall 22 may include a first arcuate surface portion 221, two straight surface portions 222, and two second arcuate surface portions 223. Referring to the azimuth relationship and the positional relationship in fig. 4, the first arc surface 221 is a lower end surface portion of the back flow wall surface 22, and both ends thereof may be connected to two straight surface portions 222, respectively. The two straight faces 222 may be connected to two second arc faces 223, respectively. The two second arc surfaces 223 may be connected to both ends of the incident flow wall surface 21, respectively, and the connection of the two second arc surfaces 223 and the incident flow wall surface 21 may form the aforementioned rib.

The first arc surface portion 221 and the second arc surface portion 223 may each be a circular arc cylindrical surface. Of course, an elliptic cylindrical surface or the like is also possible.

As also shown in fig. 4, the two edges may have a symmetry plane B therebetween, the two edges may be symmetrically disposed about the symmetry plane B, and the back flow wall 22 may be symmetrical about the symmetry plane B, so that the flow states of the partial flows located on both sides of the back flow wall 22 may be substantially uniform. It should be understood that the arrangement of the back flow wall 22 symmetrically about the symmetry plane B is merely an exemplary illustration of an embodiment of the present utility model, and is not intended to limit the scope of the injection molding case provided by the present utility model, and in practical applications, the back flow wall 22 may not be symmetrical about the symmetry plane B, as long as the requirement of use can be satisfied.

Similar to the design of the back flow wall surface 22, the back flow wall surface 21 may be a smooth curved surface so as to improve the smoothness of injection molding.

The specific structural form of the upstream wall 21 is not limited herein, and in practical applications, a person skilled in the art may determine the specific use requirements. Illustratively, the structure of the upstream wall 21 and the downstream wall 22 may be identical; alternatively, the upstream wall surface 21 may be a semi-cylindrical surface having a diameter of the distance D.

It should be understood that the upstream and downstream walls 21, 22 may not be smoothly curved, such as V-shaped, trapezoidal, etc. are possible.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims (10)

1. The utility model provides a casing of moulding plastics, its characterized in that includes casing (1) and metal connecting portion (2), metal connecting portion (2) with casing (1) are connected through integrative injection molding technology, the outer wall of metal connecting portion (2) includes upstream wall (21) and back flow wall (22), upstream wall (21) with back flow wall (22) set up relatively in the flow direction of injection fluid, upstream wall (21) with the intersecting line of back flow wall (22) is two arriss that parallel, crosses two the face of arriss is datum plane (A), back flow wall (22) are followed the convex surface portion of flow direction protrusion, back flow wall (22) with the maximum distance H of datum plane (A) and two distance D between the arriss satisfy following relation: h > D/2.

2. Injection molded housing according to claim 1, wherein the back flow wall (22) is smoothly curved.

3. The injection molding shell according to claim 2, wherein the back flow wall surface (22) comprises a first arc surface portion (221), two straight surface portions (222) and two second arc surface portions (223), two ends of the first arc surface portion (221) are respectively connected with two straight surface portions (222), two straight surface portions (222) are respectively connected with two second arc surface portions (223), and two second arc surface portions (223) are respectively connected with two ends of the head-on wall surface (21).

4. A housing according to claim 3, wherein the first arcuate surface portion (221) and the second arcuate surface portion (223) are each arcuate cylindrical surfaces.

5. Injection molded housing according to claim 2, characterized in that there is a symmetry plane (B) between two of the ribs, about which symmetry plane (B) two of the ribs are symmetrical, about which symmetry plane (B) the back flow wall (22) is symmetrical.

6. Injection molded housing according to any one of claims 1 to 5, wherein the flow-facing wall (21) is a smooth curved surface.

7. Injection molded housing according to any of claims 1-5, wherein the housing body (1) comprises a main body part (11) and an ear plate part (12), the main body part (11) is formed with a cavity (111), the ear plate part (12) is located on an outer wall surface of the main body part (11), and the metal connection part (2) is located on the ear plate part (12).

8. Injection molded housing according to any one of claims 1 to 5, wherein the metal connection part (2) is provided with a connection hole (23).

9. Injection molded housing according to claim 8, wherein the metal connection part (2) is further provided with a positioning hole (24).

10. Injection molded housing according to claim 8, wherein the number of metal connections (2) is a plurality, the aperture of the connection holes (23) of each metal connection (2) being the same.