WO2023065483A1

WO2023065483A1 - Fixing device for injection molding and injection molding device

Info

Publication number: WO2023065483A1
Application number: PCT/CN2021/136810
Authority: WO
Inventors: 李熙; 莫清华; 黄智恒; 秦雷; 贾亚洲
Original assignee: 歌尔股份有限公司
Priority date: 2021-10-19
Filing date: 2021-12-09
Publication date: 2023-04-27
Also published as: CN216442932U

Abstract

A fixing device (10) for injection molding and an injection molding device (20), the fixing device comprising a sleeve (11) and an ejector pin (12); a cavity is formed in the middle of the sleeve (11), and the ejector pin (12) is located in the cavity; an air hole (14) is formed in the sleeve (11), the air hole (14) being formed with a first mouth part (15) and a second mouth part; the sleeve (11) has a bearing surface (16), the bearing surface (16) is used for bearing an insert, and the first mouth part (15) is located on the bearing surface (16); the second mouth part is used to connect to a negative pressure device. By providing the air hole (14) on the sleeve (11) and forming negative pressure in the air hole (14), the first mouth part (15) can form adhesive force on the insert along an axial direction of the sleeve (11) so as to adhere the insert on the bearing surface (16) of the sleeve (11), thus preventing the insert from loosening or falling during injection molding.

Description

Fixtures and injection molding devices for injection molding

technical field

Embodiments of the present disclosure relate to the technical field of injection molding, and more specifically, to a fixing device and an injection molding device for injection molding.

Background technique

Injection molding When the shell of the product is provided with an embedded structure, it is usually injection molded after inserting the insert in the mold. It is usually necessary to fasten the Insert to the moving mold. However, the inserts of the mold are easy to drop during the mold clamping process.

In the prior art, taking the nut insert as an example, in order to prevent the nut from loosening or falling off during the mold clamping process. Using a threaded needle matched with the nut, after the threaded needle and the nut are tightened, the threaded needle and the nut are integrally embedded in the mold for injection molding. After the injection molding is completed, it is ejected together with the thread needle, and then the thread needle is reversely rotated from the product, and the thread needle is removed from the nut, so as to obtain a plastic product with a nut. However, this method is inefficient and the process is complicated, and after injection molding, the thread needle needs to be reversely rotated to separate from the nut, which easily causes stress on the lagging around the nut, resulting in poor nut lagging.

Therefore, a new technical solution needs to be provided to solve the above technical problems.

Utility model content

An object of the present disclosure is to provide a new technical solution for a fixture for injection molding and an injection molding device.

In one embodiment of the present disclosure, a fixing device for injection molding is provided, the fixing device for injection molding includes a sleeve and a thimble, a cavity is formed in the middle of the sleeve, and the thimble is located at the In the cavity, an air hole is formed in the sleeve, the air hole is formed with a first mouth and a second mouth, the sleeve has a bearing surface, the bearing surface is used to bear the insert, the The first port is located on the bearing surface, and the second port is used to connect with the negative pressure device.

Optionally, the insert is a nut, the surface of one end of the nut is opposite to the first mouth, and the thimble is located in the screw hole of the nut.

Optionally, there are a plurality of air holes, and a plurality of air holes form a plurality of first openings on the bearing surface of the sleeve, and a plurality of first openings surround the sleeve along the sleeve. The thimbles are evenly distributed.

Optionally, the sleeve has a side surface connected to the bearing surface, a communication cavity is formed in the sleeve, and the second mouths of the plurality of air holes communicate with the communication cavity. The side surface is provided with a third port, and the third port communicates with the communication chamber.

Optionally, the communication cavity is arranged around the thimble.

Optionally, the communication cavity communicates with the cavity.

Optionally, the communication cavity is formed by electric spark discharge.

Optionally, an axially extending groove is formed on a side of the sleeve close to the cavity, and the outer surface of the thimble and the groove together define the air hole.

Optionally, the inner diameter of the pores is 0.8mm-1.5mm.

On the other hand, an embodiment of the present disclosure provides an injection molding device, the injection molding device includes the above-mentioned fixing device for injection molding.

By providing air holes on the sleeve and forming a negative pressure in the air holes, the first mouth can form an adsorption force on the insert along the axial direction of the sleeve so that the insert can be adsorbed on the bearing surface of the sleeve. In this way, it is possible to avoid loosening or falling of the insert during the injection molding process.

Other features of the present specification and advantages thereof will become apparent through the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the embodiments of the specification and together with the description serve to explain the principles of the specification.

FIG. 1 is a schematic structural view of an embodiment of a fixing device for injection molding of the present disclosure;

Fig. 2 (a) is one of the top views of Fig. 1;

Fig. 2 (b) is the second top view of Fig. 1;

Fig. 3 is a partial structural schematic diagram of an embodiment of the injection molding device of the present disclosure;

Fig. 4 is a partially enlarged view of part A in Fig. 3 .

Explanation of reference signs:

10. Fixing device; 11. Sleeve; 12. Thimble; 13. First through hole; 14. Air hole; 15. First mouth; 16. Bearing surface; 17. Nut; 18. Connecting cavity; 19. Third Mouth; 20. Injection molding device; 21. Moving mold part.

Detailed ways

Embodiments of the present disclosure will be described in detail below, examples of which are illustrated in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present disclosure and should not be construed as limiting the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present disclosure.

The features of the terms "first" and "second" in the description and claims of the present disclosure may explicitly or implicitly include one or more of these features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

In describing the present disclosure, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", " Right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", etc. The orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be configured in a specific orientation, and operation, and therefore should not be construed as limiting the present disclosure.

In the description of the present disclosure, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be A mechanical connection can also be an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present disclosure in specific situations.

According to one embodiment of the present disclosure, a fixing device 10 for injection molding is provided. Referring to FIG. 1 and FIG. 2 , a fixing device 10 for injection molding includes a sleeve 11 and a thimble 12 , and a cavity is formed in the middle of the sleeve 11 . The thimble 12 is located in the cavity. An air hole 14 is formed in the sleeve 11, and the air hole 14 is formed with a first opening 15 and a second opening. The sleeve 11 has a bearing surface 16 for bearing the insert. The first port 15 is located on the bearing surface 16, and the second port is used to connect with the negative pressure device.

The ejector pin 12 is arranged in the cavity and can move up and down along the axial direction of the sleeve 11 to push the injection molded product out of the injection molding material.

The sleeve 11 has side surfaces connected to the bearing surface 16 .

The carrying surface 16 serves to carry the insert. The insert can be a nut 17, a bushing or a bushing.

By setting air holes 14 on the sleeve 11 and forming a negative pressure in the air holes 14, the first mouth 15 can form an adsorption force along the axial direction of the sleeve 11 on the surface of the insert opposite to the first mouth 15 In order to adsorb the insert on the bearing surface 16 of the sleeve 11 . In this way, it is possible to avoid loosening or falling of the Insert during the injection molding process.

Furthermore, the insert can be more easily separated from the fixing device 10 after injection moulding. In this way, it is possible to avoid stress on the lagging around the insert of the injection molded product, and to avoid the technical problem of poor lagging.

The air hole 14 may communicate with the cavity or be arranged at a distance from the cavity.

For example, the air hole 14 may be located in the side wall of the sleeve 11, the air hole 14 is located between the inner wall and the outer wall of the sleeve 11, and is separated from the cavity.

Specifically, the method for forming air hole 14 is:

A sleeve 11 is prepared, and a cavity is formed in the middle of the sleeve 11 .

As shown in Figure 2(b), from the bearing surface 16 of the sleeve 11, a hole is drilled downwards along the axial direction of the sleeve 11, and a hole parallel to the central axis of the cavity is formed at a position between the inner wall and the outer wall of the sleeve 11. The first through hole 13 is a part of the air hole 14 .

At the position where the outer wall of the sleeve 11 corresponds to the first through hole 13, from the outer wall of the sleeve 11 along the radial direction of the sleeve 11, a second hole perpendicular to the central axis of the first through hole 13 is formed. The through hole is to communicate with the first through hole 13 and the second through hole, and the second through hole is another part of the air hole 14. After the first through hole is communicated with the second through hole, the air hole 14 is formed, and the second through hole is in the sleeve A second mouth is formed on the outer wall of 11.

Those skilled in the art can understand that the pores 14 can also be formed by other methods, such as grinding, cutting, or extrusion.

Air holes 14 may also be provided on the inner wall of the sleeve 11 and communicate with the cavity.

For example, an axially extending groove is formed on the side of the sleeve 11 close to the cavity. The outer surface of the thimble 12 and the groove jointly form an air hole 14.

Specifically, the groove can be formed by cutting. The cutting knife enters the cavity from one end of the cavity, and the cutting edge contacts the side wall of the cavity and forms a groove at a set position of the side wall of the cavity.

The groove runs through the inner wall of the sleeve 11 in the axial direction and is parallel to the central axis of the cavity.

The thimble 12 is placed in the cavity, so that the outer surface of the thimble 12 and the inner wall of the sleeve 11 together form an air hole 14 .

In the above examples, the first mouth 15 is located on the carrying surface 16 , and the shape of the first mouth 15 is circular, rectangular or the like. No specific limitation is imposed on the cross-sectional shape of the first mouth portion 15 here.

The second port is used to connect with the negative pressure device. The negative pressure device is turned on to form a negative pressure in the air hole 14 so that the first mouth portion 15 can adsorb the insert on the bearing surface 16 .

The second mouth is connected to the negative pressure device, and may also be connected to the negative pressure device through other structures.

In one example, the inner diameter of the air hole 14 is 0.8mm-1.5mm. Within this range, the structure of the sleeve 11 is more stable while the air hole 14 satisfies the adsorption force on the insert.

In one embodiment, the insert is a nut 17 , the surface of one end of the nut 17 is opposite to the first mouth 15 , and the thimble 12 is located in the screw hole of the nut 17 .

The thimble 12 is located in the screw hole, on the one hand, it plays a role of occupying space, and prevents the thread structure of the inner wall of the insert nut 17 and the through hole inside the nut 17 from being filled with injection molding material. On the other hand, it further plays the role of fixing the nut 17 to prevent the nut 17 from being displaced when the orientation of the cavity changes.

In one embodiment, there are multiple air holes 14 . A plurality of air holes 14 form a plurality of first openings 15 on the bearing surface 16 of the sleeve 11 . A plurality of first mouths 15 are evenly distributed around the thimble 12 .

In this way, the insert is more firmly adsorbed on the surface of the bearing surface 16 .

For example, referring to FIG. 2( a ) or FIG. 2( b ), there are four air holes 14 , and the four air holes 14 form four first openings 15 on the bearing surface 16 . The four first mouths 15 are evenly distributed around the thimble 12 .

For example, there are six air holes 14 , and the six air holes 14 form six first openings 15 on the bearing surface 16 . Six first mouths 15 are distributed circularly around the cavity. In this way, the fixing effect on the insert is further improved.

The quantity of air hole 14 is not limited to above-mentioned embodiment, those skilled in the art can set according to actual needs.

In one embodiment, referring to FIG. 1 , FIG. 2( a ) or FIG. 2( b ), the sleeve 11 has a side surface connected to the bearing surface 16 . A communication cavity 18 is formed in the sleeve 11 . The second mouths of the plurality of air holes 14 communicate with the communication cavity 18 . A third mouth portion 19 is provided on the side surface. The third port 19 communicates with the communication cavity 18 .

The air holes 14 are parallel to each other and the central axis of the cavity.

The second mouth is located in the side wall and isolated from the outside. A plurality of second ports are all in communication with the communication cavity 18, and the communication cavity 18 is connected with a negative pressure device to realize negative pressure in the communication cavity 18, and then form a negative pressure in the air hole 14 through the second ports to adsorb the insert on the bearing surface 16 .

The communication cavity 18 is arranged perpendicular to the central axis of the air hole 14 .

For example, the communication chamber 18 communicates with the cavity.

The communication cavity 18 is located on the inner wall of the sleeve 11 , and the outer wall of the thimble 12 and the inner wall of the sleeve 11 together form the communication cavity 18 .

In one embodiment, the communication cavity 18 is formed by electric spark discharge.

Specifically, the formation method of the communication chamber 18 is as follows:

A steel needle is obtained, and an electrode matching the set shape of the communication cavity 18 is obtained, and the steel needle is connected to the electrode to form an electrode assembly.

Place the electrode assembly in the set position within the cavity.

Put the electrode assembly and the fixing device 10 in the insulating liquid.

The electrode assembly is connected with the spark machine, and the spark machine applies a set voltage to the electrode assembly to process it into a communication cavity communicated with the air hole.

Wherein, the diameter of the steel needle assembly is smaller than that of the cavity, for example, the diameter of the cavity is 1mm, and the diameter of the steel needle assembly can be between 0.1mm-0.5mm. Preferably, the diameter of the steel needle assembly is 0.4mm.

In this way, when the size of the cavity is small and the thickness of the side wall of the sleeve 11 is relatively thin, the communication cavity 18 can be processed on the cavity wall of the cavity.

Optionally, the electrodes are cylindrical or arcuate.

Optionally, the electrodes are copper or copper alloy.

Through such a processing method, the communication cavity 18 can be formed in a cavity with a small diameter.

The number of the third mouth 19 may be one or more. That is, when there is one communicating chamber 18, one third mouth 19 can be formed on the outer wall to communicate with the communicating chamber 18, or a plurality of third mouths 19 can be formed on the outer wall, and the plurality of third mouths 19 are all connected to the communicating chamber. 18 connected.

Optionally, when there are multiple third openings 19 , they may be evenly distributed around the side wall of the sleeve 11 . Optionally, when there are multiple third ports 19, they can be connected to multiple negative pressure devices.

In one example, the communication cavity 18 is disposed around the thimble 12 .

For example, there is one communication cavity 18 , and the communication cavity 18 surrounds the thimble 12 and is along the side wall of the sleeve 11 . The cross-sectional shape of the communication cavity 18 is arc or ring.

For example, there are multiple communicating cavities 18 . The plurality of communication cavities 18 are correspondingly connected to the set second ports. A third port 19 is formed on the outer wall of the sleeve 11 to communicate with the corresponding communication cavity 18 .

In this way, in the set state, the set third ports 19 can be respectively connected to the negative pressure device to form negative pressure in the set first port 15 .

According to another embodiment of the present disclosure, an injection molding device 20 is provided. Referring to FIG. 4 , the injection molding device 20 includes the fixing device 10 .

Specifically, the injection molding device 20 includes a movable mold part 21 and a static mold part, and one end of the fixing device 10 is fixed on the movable mold part 21 . The nut 17 is sheathed on the thimble 12 and is located at the end of the fixing device 10 opposite to the movable mold part 21 .

Negative pressure is formed in the air hole 14 so that the first mouth portion 15 can be fixed on the bearing surface 16 such as a nut 17 . Then the movable mold part 21 is moved and clamped with the static mold part to form a mold cavity.

While injecting plastic into the mold cavity, keep the first mouth portion 15 to provide negative pressure to the nut 17 so as to adsorb the nut 17 on the bearing surface 16 .

After the injection molding is completed, the fixing device 10 is separated from the nut 17 .

In this way, it is possible to avoid loosening or falling of the nut 17 when the movable mold part 21 is displaced or when the position is changed. At the same time, it is effectively avoided that when the fixing device 10 is separated from the nut 17 , the rubber lagging at the position of the nut 17 in the injection molded product is damaged.

The description of "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific examples", or "some examples" means specific features, structures described in connection with the embodiment or example , material or characteristic is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present disclosure have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present disclosure. The scope of the present disclosure is defined by the claims and their equivalents.

Claims

A fixing device for injection molding, characterized in that it comprises: a sleeve (11) and a thimble (12), a cavity is formed in the middle of the sleeve (11), and the thimble (12) is located in the cavity In the cavity, an air hole (14) is formed in the sleeve (11), the air hole (14) is formed with a first mouth (15) and a second mouth, and the sleeve (11) has a bearing surface (16), the bearing surface (16) is used for bearing inserts, the first mouth (15) is located on the bearing surface (16), and the second mouth is used for connecting with a negative pressure device.
The fixing device for injection molding according to claim 1, characterized in that, the insert is a nut (17), and the surface of one end of the nut (17) is in contact with the first mouth (15) In contrast, the thimble (12) is located in the screw hole of the nut (17).
The fixing device for injection molding according to claim 1, characterized in that there are multiple air holes (14), and a plurality of air holes (14) are formed on the bearing surface (16) of the sleeve (11). A plurality of the first mouth portions (15) are formed, and the plurality of the first mouth portions (15) are evenly distributed around the thimble (12) along the sleeve (11).
The fixing device for injection molding according to claim 3, characterized in that, the sleeve (11) has a side surface connected to the bearing surface (16), and a mold is formed in the sleeve (11). A communication chamber (18), the second mouth of the plurality of air holes (14) communicates with the communication chamber (18), and a third mouth (19) is provided on the side surface, and the third The mouth (19) communicates with the communication cavity (18).
The fixing device for injection molding according to claim 4, characterized in that, the communication cavity (18) is arranged around the ejector pin (12).
The fixing device for injection molding according to claim 4, characterized in that the communication cavity (18) communicates with the cavity.
The fixing device for injection molding according to claim 4, characterized in that the communication cavity (18) is formed by electric spark discharge.
The fixing device for injection molding according to any one of claims 1-7, characterized in that an axially extending groove is formed on the side of the sleeve (11) close to the cavity, the The outer surface of the thimble (12) together with the groove forms the air hole (14).
The fixing device for injection molding according to any one of claims 1-7, characterized in that the inner diameter of the air hole (14) is 0.8mm-1.5mm.
An injection molding device, characterized by comprising the fixing device for injection molding according to any one of claims 1-9.