CN220995272U - Mould - Google Patents

Abstract

The application provides a die, which is internally provided with a cavity and an exhaust groove which are communicated, wherein the cavity is used for filling injection molding materials to form an injection molding piece, the die is internally provided with a base surface, an inclined surface and a functional surface, the functional surface is parallel to the base surface, the functional surface is used for forming a working plane on the injection molding piece, the inclined surface is obliquely arranged relative to the base surface, the functional surface is connected to the top end of the inclined surface, the communication position of the exhaust groove and the cavity is between the bottom end of the inclined surface and the base surface, and the bottom end inclined surface of the inclined surface can guide bubbles gathered on the functional surface to enter the exhaust groove during injection molding. The air bubble in the cavity can move along the inclined plane towards the direction close to the base plane under the injection pressure, so that the air bubble smoothly enters the air exhaust groove and is discharged out of the cavity, and the air bubble is prevented from being trapped.

Description

Mould

Technical Field

The application relates to the field of injection molding, in particular to a mold.

Background

At present, in the injection molding process, when liquid silica gel is injected into a cavity of a mold, gas in the cavity is discharged through a gas discharge groove, so that the liquid silica gel fills the cavity, however, when the liquid silica gel fills a right-angle structure of the mold cavity, a trapping phenomenon is easy to generate, so that bubbles are generated at the right-angle structure position of the mold cavity, the bubbles at the position are difficult to discharge through the gas discharge groove, and finally, poor products of the liquid silica gel are caused.

Disclosure of utility model

In view of this, it is necessary to provide a mold capable of facilitating the discharge of bubbles to reduce the phenomenon of trapped air.

The application provides a mold, wherein a cavity and an exhaust groove are communicated with each other are arranged in the mold at the bottom end of a bevel, the cavity is used for filling injection molding materials and forming the injection molding materials into injection molding pieces, the mold is provided with a base surface, a bevel and a functional surface in the cavity, the functional surface is parallel to the base surface and is opposite to the base surface, the functional surface is used for forming a working plane on the injection molding pieces, the bevel is obliquely arranged relative to the base surface, one end of the bevel, which is close to the base surface, is the bottom end of the bevel, one end of the bevel, which is far away from the base surface, is the top end of the bevel, the functional surface is connected to the top end of the bevel, the communication position of the exhaust groove and the cavity is between the bottom end of the bevel and the base surface, and the bottom end bevel of the bevel can guide bubbles gathered on the functional surface to enter the exhaust groove during injection molding, so that the bubbles can be discharged out of the cavity through the exhaust groove.

In the die, the functional surface is connected to the top end of the inclined surface, the communication position of the air exhaust groove and the cavity is between the bottom end of the inclined surface and the base surface, so that air bubbles gathered at the functional surface can move along the inclined surface towards the direction close to the base surface under injection pressure, and can smoothly enter the air exhaust groove and be discharged out of the cavity, thereby avoiding the air trapping phenomenon at the functional surface.

In some embodiments, the top end of the bevel and the functional surface have a first height difference relative to the base surface, the first height difference being greater than 0 such that the top end of the bevel is not higher than the functional surface.

In some embodiments, the first height difference is greater than or equal to five times a machining tolerance of the mold at the bevel and the functional face.

In some embodiments, the bottom end of the bevel and the base surface have a second height difference therebetween, the second height difference being greater than 0, the second height difference causing the mold to form a stop surface between the bottom end of the bevel and the base surface, the stop surface for limiting injection molding material from entering the vent slot.

In some embodiments, the stop surface is formed by an electrical discharge process, the machined end of the electrode used in the electrical discharge process having a rounded corner, and the second height difference is greater than or equal to twice the radius of the rounded corner.

In some embodiments, the limiting surface is a plane and perpendicular to the base surface, or the limiting surface is a plane and is obliquely arranged relative to the base surface, and the inclination angle of the limiting surface is larger than that of the inclined surface, or the limiting surface is a curved surface, and the inclination angle of a tangent line on each part of the curved surface relative to the base surface gradually increases along the direction approaching to the base surface.

In some embodiments, the mold has a third height difference between the base surface and the communication between the vent slot and the cavity, the third height difference being less than a flash value of the injection molding material.

In some embodiments, the cavity is annular, the injection material is injected into the cavity by the mold through two injection points, the mold is provided with two inclined planes in the cavity, the cavity is respectively provided with one inclined plane in a part between the two injection points, and the cavity is communicated with an exhaust groove between the bottom end of each inclined plane and the base surface.

In some embodiments, the width of the bottom end of the chamfer is greater than or equal to the width of the vent slot where it communicates with the cavity.

In some embodiments, the mold has at least one converging surface in the cavity, the at least one converging surface being located on at least one side of the inclined surface and connected between the inclined surface and the base surface, the converging surface being capable of gradually decreasing the width of the inclined surface in a direction approaching the vent slot, the converging surface being for guiding air bubbles in the cavity into the vent slot.

Drawings

FIG. 1 is a cross-sectional view of a mold of the present application in one embodiment.

Fig. 2 is an enlarged view at II in fig. 1.

Fig. 3 is an enlarged view at III in fig. 1.

Fig. 4 is a partial cross-sectional view of the die of fig. 3 when the limiting surface and the bevel are machined by an electrode.

Fig. 5 is a partial cross-sectional view of the stop face and chamfer of the die of the present application in another embodiment.

Fig. 6 is a partial cross-sectional view of the stop face and chamfer of the die of the present application in yet another embodiment.

FIG. 7 is a partial cross-sectional view of a vent slot of a mold of the present application in one embodiment.

FIG. 8 is a partial cross-sectional view of a chamfer and vent groove of the mold of the present application in one embodiment.

FIG. 9 is a partial cross-sectional view of a chamfer and vent groove of the die of the present application in another embodiment.

Fig. 10 is a cross-sectional view of a mold of the present application in another embodiment.

Fig. 11 is a perspective view of a fixture according to an embodiment of the application.

Description of the main reference signs

Mold 100

Cavity 10

Base surface 11

Bevel 12

Functional surface 13

Limiting surface 14

Rounded surface 141

Gathering surface 15

Male die core 110

Female die core 120

Exhaust groove 20

Injection molding 200

Work plane 210

Electrode 300

Rounded corners 310

Carrier plate 400

Through hole 410

Jig 500

Detailed Description

The following description of the embodiments of the present application refers to the accompanying drawings, which illustrate some, but not all embodiments of the application.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "vertical" is used to describe an ideal state between two components. In the actual production or use state, there may be an approximately vertical state between the two components. For example, in conjunction with the numerical description, perpendicular may refer to an angle between two straight lines ranging between 90++10°, perpendicular may refer to a dihedral angle between two base planes ranging between 90++10°, and perpendicular may refer to an angle between a straight line and a base plane ranging between 90++10°. The two components described as "perpendicular" may be not absolute straight lines, or base surfaces, but may be substantially straight lines or base surfaces, and the components may be considered "straight lines" or "base surfaces" when the overall direction of extension is, macroscopically, straight lines or base surfaces.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.

Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without collision.

Referring to fig. 1 to 3, a mold 100 for injection molding an injection molding member 200 is provided in an embodiment of the present application. The mold 100 is provided with a cavity 10 and an exhaust groove 20 which are communicated with each other. The cavity 10 is used for filling injection molding material, and the liquid injection molding material is solidified in the cavity 10 after filling the cavity 10 to form the injection molding piece 200. When injection molding material is injected into the cavity 10, gas in the cavity 10 is discharged from the cavity 10 through the vent groove 20 at injection pressure.

In some embodiments, the mold 100 has a base surface 11 and an inclined surface 12 disposed opposite to each other in the cavity 10, the base surface 11 is a plane, the inclined surface 12 is disposed obliquely with respect to the base surface 11, one end of the inclined surface 12 near the base surface 11 is defined as a bottom end of the inclined surface 12, and one end of the inclined surface 12 away from the base surface 11 is defined as a top end of the inclined surface 12. The communication position between the air discharge groove 20 and the cavity 10 is located between the bottom end of the inclined surface 12 and the base surface 11, so that air bubbles in the cavity 10 can move from the top end to the bottom end of the inclined surface 12 under injection pressure, and the inclined surface 12 can guide the air bubbles in the cavity 10 to enter the air discharge groove 20 more smoothly, thereby avoiding air trapping phenomenon and improving the molding quality of the injection molding piece 200.

Compared with the prior art, the mold is easy to cause the air trapping phenomenon due to the arrangement of the right-angle structure in the cavity, the inclined surface 12 replaces the right-angle structure, and the application can play a role in guiding the air bubble to move to the air exhaust groove 20, so that the air bubble can enter the air exhaust groove 20 more easily under the same injection molding pressure, the air trapping phenomenon is reduced, and the molding quality of the injection molding piece 200 is improved.

In some embodiments, mold 100 also has a functional surface 13 within cavity 10, functional surface 13 being used to form a working surface 210 on injection molding 200, and injection molding 200 is subsequently performed via working surface 210. The functional surface 13 is parallel to the base surface 11, and a first height difference D1 (as shown in fig. 2) is formed between the top end of the inclined surface 12 and the functional surface 13 relative to the base surface 11, and the first height difference D1 is greater than 0, so that the top end of the inclined surface 12 is not higher than the height of the functional surface 13 relative to the base surface 11 during injection molding, thereby avoiding the injection molding piece 200 from forming a bulge at the edge of the working plane 210, and further avoiding affecting the action of the working plane 210, so as to improve the working quality of the working plane 210.

In some embodiments, the first height difference D1 is greater than or equal to a machining tolerance of the mold 100 at the bevel 12 and the functional face 13. As an exemplary example, the mold 100 is machined at the inclined surface 12 and the functional surface 13 by an electric discharge process that etches away the material of the mold 100 by an electric erosion generated at the time of electric discharge to machine the inclined surface 12 and the functional surface 13. Wherein, the discharge tolerance of the discharge process is +/-0.01 mm, and the positive and negative of the discharge tolerance cannot be controlled, so in order to ensure that the etching depth at the top end of the inclined surface 12 is not greater than the etching depth at the functional surface 13 when the mold 100 is processed (i.e. in order to ensure that the top end of the inclined surface 12 is not higher than the functional surface 13 when injection molding), D1 is at least 0.01mm in design, i.e. D1 is greater than or equal to 0.01mm; otherwise, if D1 is smaller than 0.01mm in design, when the discharge tolerance is +0.01mm, the etching depth at the top end of the inclined surface 12 is larger than the etching depth at the functional surface 13 during processing, and further, the top end of the inclined surface 12 is higher than the functional surface 13 during injection molding, so that the injection molding piece 200 forms a bulge at the edge of the working plane 210, so in order to offset the possible +0.01mm discharge tolerance, D1 needs to be greater than or equal to 0.01mm.

In some embodiments, it follows from a lot of machining experience that in order to ensure that the tip of the bevel 12 is not higher than the height of the functional surface 13, the first height difference D1 needs to be greater than or equal to five times the machining tolerance of the mold 100 at the bevel 12 and the functional surface 13 in design. As an exemplary example, the die 100 is machined at the inclined surface 12 and the functional surface 13 by an electric discharge process with a machining tolerance of ±0.01mm, so that D1 has a value of 0.05mm or more.

In some embodiments, the bottom end of the inclined surface 12 and the base surface 11 have a second height difference D2 (as shown in fig. 3), and the second height difference D2 enables the mold 100 to form a limiting surface 14 between the bottom end of the inclined surface 12 and a position where the vent groove 20 communicates with the cavity 10, and the limiting surface 14 is used to limit the injection molding material from entering the vent groove 20. If the bottom end of the inclined surface 12 directly extends to the connection position between the air exhaust groove 20 and the cavity 10, the liquid injection molding material is easy to enter the air exhaust groove 20 under the guidance of the inclined surface 12 to form burrs, and after the injection molding material at the burrs is solidified, a large amount of injection molding material remains on the wall of the air exhaust groove 20 after the injection molding material is repeatedly molded, and finally the air exhaust groove 20 is blocked, so that the air exhaust is not enabled to generate bubbles in the injection molding piece 200.

Referring to fig. 3 to 6, in some embodiments, the die 100 processes the limiting surface 14 by an electric discharge process, in which the electrode 300 is used to discharge to etch away the material of the die 100, wherein the end portion of the electrode 300 for processing changes from a sharp corner to a rounded corner 310 due to long-term use, so that, in order to process the limiting surface 14, the second height difference D2 needs to be larger than the radius R of the rounded corner 310 in design, otherwise, if the second height difference D2 is smaller than or equal to the radius R of the rounded corner 310 in design, the electrode 300 cannot process the limiting surface 14 at all, and only one cambered surface matching the rounded corner 310 can be processed, thereby affecting the function of the limiting surface 14 in injection molding.

In some embodiments, the second height difference D2 is designed to be greater than or equal to twice the radius R of the fillet 310 in order to machine the limit face 14 by an electrical discharge process, as derived from a significant amount of machining experience. As an exemplary example, the radius R of the fillet 310 is typically 0.1mm, so the second height difference D2 has a value of greater than or equal to 0.2mm.

In some embodiments, the limiting surface 14 is planar, and it is understood that, due to the rounded corner 310, there must also be a rounded corner surface 141 at the connection between the limiting surface 14 and the inclined surface 12 after machining, where the rounded corner surface 141 can eliminate the edge that is originally present in design between the limiting surface 14 and the inclined surface 12, so that the bubbles move to the bottom end of the inclined surface 12 and then move along the rounded corner surface 141, and thus the bubbles enter the air exhaust groove 20 more easily.

In some embodiments, the limiting surface 14 is planar (as shown in fig. 4), and the limiting surface 14 is perpendicular to the base surface 11 during injection molding, so that the limiting surface 14 better functions to stop the liquid injection molding material from entering the air vent 20, so as to reduce the generation of burrs.

In some embodiments, the limiting surface 14 is a plane (as shown in fig. 5), and the limiting surface 14 is inclined relative to the base surface 11, where the inclination angle of the limiting surface 14 is greater than that of the inclined surface 12, so that the limiting surface 14 can play a role in stopping the liquid injection molding material from entering the air discharge groove 20 and guiding the air bubbles to move toward the air discharge groove 20, thereby reducing the generation of burrs and facilitating the discharge of the air bubbles.

In some embodiments, the limiting surface 14 is a curved surface (as shown in fig. 6), and the inclination angle of the tangent line of each part of the curved surface with respect to the base surface 11 is gradually increased along the direction approaching to the base surface 11, so that the limiting surface 14 can stop the liquid injection molding material from entering the air discharge groove 20 and guide the air bubbles to move towards the air discharge groove 20, thereby reducing the generation of burrs and facilitating the discharge of the air bubbles.

In some embodiments, the mold 100 may be formed by other processes, such as milling, at the inclined surface 12 and the limiting surface 14, and the first height difference D1 and the second height difference D2 may be adaptively adjusted according to the machining tolerance and the machining tool of different processes.

Referring to fig. 1 and 3, in some embodiments, the mold 100 has a third height difference D3 between the base 11 and the communication portion between the vent slot 20 and the cavity 10, wherein the third height difference D3 is the height of the vent slot 20 relative to the base 11, and the third height difference D3 is smaller than the overflow value of the injection molding material, so as to prevent the liquid injection molding material from flowing into the vent slot 20.

In some embodiments, the injection molding material is liquid silica gel, that is LSR (Liquid Silicone Rubber) silica gel, and the overflow value of the liquid silica gel is 0.005-0.01mm, so the value of the third height difference D3 is required to be smaller than 0.01mm.

Referring to fig. 7, in some embodiments, the height of the vent slot 20 relative to the base surface 11 may be varied, for example, the height of the vent slot 20 relative to the base surface 11 may be gradually increased along a direction away from the cavity 10 except for the communication between the vent slot 20 and the cavity 10, so that the height of the vent slot 20 is not limited to the third height difference D3, and thus the vent slot 20 can accommodate more gas, so as to improve the venting efficiency.

Referring to fig. 1 and 11 in combination, in some embodiments, the cavity 10 is annular to form an injection molding member 200 having an annular structure. The mold 100 injects injection molding material into the cavity 10 through two injection points a, which can improve injection efficiency and make injection more uniform. The mold 100 has two inclined planes 12 in the cavity 10, one inclined plane 12 is respectively arranged in the part of the cavity 10 between the two injection points A, and correspondingly, each inclined plane 12 of the mold 100 is provided with an air discharge groove 20, so that air bubbles in the part of the cavity 10 between the two injection points A can be timely discharged through the nearest inclined plane 12 and the air discharge groove 20, and the situation that the air bubbles are too far away from the air discharge groove 20 to be discharged is avoided.

Further alternatively, the position of each inclined surface 12 is the same as the injection distance between the two injection points a in the cavity 10, so that the injection material injected by each injection point a can exhaust the air bubbles from the exhaust grooves 20 on both sides to the same extent, thereby ensuring more uniform air bubble exhaust.

In some embodiments, the injection points a may have more, such as three, five, or eight, and each adjacent two injection points a may be provided with one or more inclined surfaces 12 and vent grooves 20, thereby making injection molding more efficient and uniform.

Referring to fig. 8, in some embodiments, the width L of the bottom end of the inclined surface 12 is greater than or equal to the width H of the communicating portion of the air vent groove 20 and the cavity 10, so that the limiting surface 14 can extend not only in the height direction of the air vent groove 20 but also in the width direction of the air vent groove 20, thereby further stopping the liquid injection molding material from entering the air vent groove 20 to avoid burrs.

Referring to fig. 9, in some embodiments, the mold 100 further includes at least one gathering surface 15 in the cavity 10, the at least one gathering surface 15 is located on at least one side of the inclined surface 12, the gathering surface 15 is connected between the inclined surface 12 and the base surface 11, the gathering surface 15 can gradually reduce the width of the inclined surface 12 along the direction approaching the vent slot 20, and the gathering surface 15 is used for assisting in guiding bubbles in the cavity 10 into the vent slot 20.

Referring to fig. 1, in some embodiments, the mold 100 includes a male mold core 110 and a female mold core 120, a base surface 11 is disposed on the female mold core 120, an inclined surface 12, a functional surface 13 and a limiting surface 14 are disposed on the male mold core 110, and after the male mold core 110 and the female mold core 120 are assembled, a cavity 10 and an air vent 20 are formed between the male mold core 110 and the base surface 11 of the female mold core 120.

Referring to fig. 10 and 11, in some embodiments, in the injection molding process, a carrier 400 is fixed on a cavity plate 120, a base surface 11 is a side surface of the carrier 400 facing a cavity plate 110, after the cavity plate 110 and the cavity plate 120 are clamped, a cavity 10 and an air vent 20 are formed between the cavity plate 110 and the base surface 11, an injection molding piece 200 is formed on the base surface 11 of the carrier 400 and integrated with the carrier 400 to form a jig 500, the jig 500 is used for carrying a transparent screen of an electronic product, and the transparent screen is positioned on the injection molding piece 200 so as to process the transparent screen.

In some embodiments, the carrier 400 is a glass plate, and when the transparent screen is processed, the jig 500 and the transparent screen are placed in a glue filling device, the glue filling device is used for performing glue filling operation on the transparent screen, the glue filling device is provided with a light source on one side of the glass plate, which is opposite to the injection molding piece 200, the glass plate can transmit light emitted by the light source, and the light source is used for solidifying glue on the transparent screen through illumination, so that glue filling processing of the transparent screen is realized.

In some embodiments, the carrier 400 has a through hole 410, and the end of the vent 20 away from the cavity 10 communicates with the through hole 410, and the male mold insert 110 or the female mold insert 120 communicates the through hole 410 with the outside of the mold 100, so that the gas is exhausted out of the mold 100.

In addition, those skilled in the art will recognize that the foregoing embodiments are merely illustrative of the present application and are not intended to be limiting, as appropriate modifications and variations of the foregoing embodiments are within the scope of the disclosure of the application.

Claims (10)

1. A mold, characterized in that:

The mold is internally provided with a cavity and an exhaust groove which are communicated, the cavity is used for filling injection molding materials and enabling the injection molding materials to be formed into injection molding pieces, the mold is internally provided with a base surface, an inclined surface and a functional surface, the functional surface is parallel to the base surface and is opposite to the base surface, the functional surface is used for forming a working plane by the injection molding pieces, the inclined surface is obliquely arranged relative to the base surface, one end of the inclined surface, which is close to the base surface, is the bottom end of the inclined surface, one end of the inclined surface, which is far away from the base surface, is the top end of the inclined surface, the functional surface is connected to the top end of the inclined surface, the position, which is communicated with the cavity, is between the bottom end of the inclined surface and the base surface, and bubbles gathered on the functional surface can be guided to enter the exhaust groove during injection molding, so that the bubbles can be discharged out of the cavity through the exhaust groove.

2. The mold of claim 1, wherein: and a first height difference is arranged between the top end of the inclined surface and the functional surface relative to the base surface, and the first height difference is larger than 0, so that the top end of the inclined surface is not higher than the functional surface.

3. A mold as in claim 2, wherein: the first height difference is greater than or equal to five times a machining tolerance of the mold at the inclined surface and the functional surface.

4. The mold of claim 1, wherein: and a second height difference is arranged between the bottom end of the inclined surface and the base surface relative to the base surface, the second height difference is larger than 0, the second height difference enables the die to form a limiting surface between the bottom end of the inclined surface and the base surface, and the limiting surface is used for limiting the injection molding material to enter the exhaust groove.

5. The mold of claim 4, wherein: the limiting surface is formed by machining through an electric discharge process, the machining end part of the electrode used in the electric discharge process is provided with a round angle, and the second height difference is larger than or equal to twice the radius of the round angle.

6. The mold of claim 4, wherein: the limiting surface is a plane and is perpendicular to the base surface, or the limiting surface is a plane and is obliquely arranged relative to the base surface, the inclination angle of the limiting surface is larger than that of the inclined surface, or the limiting surface is a curved surface, and the inclination angle of tangent lines at all positions of the curved surface relative to the base surface is gradually increased along the direction close to the base surface.

7. The mold of claim 1, wherein: and the mold is provided with a third height difference between the communicating part of the exhaust groove and the cavity and the base surface relative to the base surface, and the third height difference is smaller than the edge overflow value of the injection molding material.

8. The mold of claim 1, wherein: the cavity is annular, injection materials are injected into the cavity through two injection points, two inclined planes are arranged in the cavity, one inclined plane is arranged in the cavity in a part between the two injection points, and one exhaust groove is communicated between the bottom end of each inclined plane and the base surface of the cavity.

9. The mold of claim 1, wherein: the width of the bottom end of the inclined plane is larger than or equal to the width of the communication part of the exhaust groove and the cavity.

10. The mold of claim 1, wherein: the die is provided with at least one gathering surface in the die cavity, the at least one gathering surface is positioned on at least one side of the inclined surface and connected between the inclined surface and the base surface, the gathering surface can enable the width of the inclined surface to gradually decrease along the direction close to the exhaust groove, and the gathering surface is used for guiding bubbles in the die cavity to enter the exhaust groove.