WO2022199720A1

WO2022199720A1 - Injection mold

Info

Publication number: WO2022199720A1
Application number: PCT/CN2022/100815
Authority: WO
Inventors: 刘焕牢; 张子林; 王宇林; 孔繁伟
Original assignee: 广东海洋大学
Priority date: 2021-08-12
Filing date: 2022-06-23
Publication date: 2022-09-29
Also published as: ZA202208025B; CN113459424A

Abstract

Disclosed in the present invention is an injection mold, comprising an injection mold cavity insert and an injection mold core insert, wherein the injection mold cavity insert and the injection mold core insert are connected above and below each other in a matching manner; the injection mold cavity insert is provided with a runner therethrough from top to bottom; an upper end of the runner is in communication with a plastic filling gate, and a lower end thereof is in communication with a hot sprue; the diameter of the runner gradually increases from the plastic filling gate to the hot sprue, and same has a conical shape; the injection mold cavity insert is further provided with a cavity insert core, which is movable in a lifting manner, and the middle of the cavity insert core is provided with a cavity insert cavity; the runner is in communication with the cavity insert cavity by means of the hot sprue; the injection mold core insert is provided with a core insert core, and the core insert core is provided with a core insert cavity; and the core insert cavity and the cavity insert cavity are in communication with each other and are jointed to form a molding cavity of a product. The present invention solves the problem of an injection molding product having colored stripes and punched marks due to the excessive injection molding pressure and flow rate of a plastic material, and also solves the problem that the plastic material might solidify when entering a cavity under the influence of temperature, thereby improving the quality and qualification rate of the product.

Description

an injection mold

technical field

The invention relates to the technical field of injection molding, in particular to an injection mold.

Background technique

The mold is called the "mother of industry" and is a special tool to assist the forming of metal or non-metal materials. There are many methods of plastic molding. Injection molding is the most commonly used plastic molding technology, and it is also one of the most common processing methods in the plastics industry. It can mold plastic products with complex shapes and structures at one time. The injection mold consists of a movable mold and a fixed mold. The movable mold is installed on the moving template of the injection molding machine, and the fixed mold is installed on the fixed template of the injection molding machine. During injection molding, the movable and fixed molds are closed to form a gating system and a cavity. After the injection molding is completed, the movable and fixed molds are separated and the plastic products are taken out by means of an ejector mechanism.

In the existing injection mold, single-cavity mold injection is performed. When the plastic melt passes through the radial flow channel, the flow rate and pressure are too large due to the constant diameter of the flow channel. The final injection molding product may produce color streaks, traces of printing, affecting Injection effect. When the molten rubber passes through a long and straight flow channel, the temperature of the rubber entering the cavity may be affected, and a little of the rubber may solidify, which affects the quality of the product.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an injection mold, which solves the problem of color streaks and printing on injection products caused by excessive injection pressure and flow rate of the sizing material, and at the same time solves the problem that the temperature of the sizing material may be affected by entering the cavity and may solidify.

In order to achieve the above object, the present invention adopts the following technical solutions:

An injection mold, comprising an injection mold front mold and an injection mold rear mold, wherein the upper and lower setting modes of the injection mold front mold and the injection mold rear mold are mutually matched and connected,

The front mold of the injection mold is provided with a flow channel from top to bottom. The upper end of the flow channel is connected to the glue inlet, and the lower end is connected to the hot nozzle. The diameter of the flow channel gradually increases from the glue inlet to the hot nozzle. Conical, the front mold of the injection mold is also provided with a front mold core that can move up and down, the middle of the front mold core is provided with a front mold cavity, and the flow channel communicates with the front mold cavity through a hot nozzle;

The back mold of the injection mold is provided with a back mold core, and the back mold core is provided with a back mold cavity, and the back mold cavity and the front mold cavity are communicated with and joined to form a molding cavity of the product;

The rear mold of the injection mold is also provided with an ejector device, which is arranged at the bottom of the rear mold core. mold core, and eject the formed product through the ejector pin, so that the product is separated from the rear cavity of the rear mold core.

Preferably, the front mold of the injection mold includes a positioning ring, a front mold fixing plate and a front mold core. The mold core, the retractable rod is arranged in the back mold seat plate, and the front mold cavity of the front mold core is connected with the glue inlet provided on the positioning ring through the flow channel.

Preferably, the rear mold of the injection mold includes a rear mold fixing plate, a rear mold base plate, a rear mold core, a rear mold cushion block and an ejector, and rear mold cushions are respectively provided on both sides of the rear mold fixing plate. The middle position of the rear mold spacer is provided with an ejector device, the top side of the ejector device is provided with a rear mold seat plate through the rear mold spacer, and a rear mold core is arranged in the rear mold seat plate.

Preferably, the ejection device includes an ejector pin, a reset rod, an ejector pad and an ejector plate, the ejector pad is arranged on the top side of the fixing plate of the rear mold, and the ejector pad is retractable through the reset rod The first reset rod passes through the ejector plate and the rear mold base plate and is connected to the front mold core. The reset rod includes a first reset rod and a second reset rod. The two reset rods are connected, and the second reset rod is connected with the front mold core. The ejector pin is arranged in the rear mold fixing plate, and the ejector pin passes through the ejector pad, ejector plate, rear mold base plate and rear mold in turn. The core is in contact with the product.

Preferably, the front mold of the injection mold further includes a guide mechanism, the guide mechanism is a guide pin, and the guide pin penetrates and is fixed in the guide holes of the front mold fixing plate and the rear mold base plate.

Preferably, an ejection guide pin is provided between the front mold fixing plate and the rear mold base plate, and the ejection guide pin corresponds to the ejection guide holes respectively opened on the front mold fixing plate and the rear mold base plate. The ejection guide pins are arranged in the ejection guide holes, there are six ejection guide holes, and the included angles between two adjacent ejection guide holes are distributed at 60°.

Preferably, the rear mold of the injection mold further includes a positioning member, and the positioning member is a positioning pin, and the positioning pin penetrates through the rear mold cushion block and the rear mold base plate, so that the rear mold cushion block and the rear mold base plate are connected to the rear mold base plate. The formwork fixing plate is connected and fixed.

Preferably, the back mold of the injection mold further includes a back mold support rod, the back mold support rod is arranged between the back mold fixing plate and the back mold seat plate, and the back mold support rod and the back mold spacer jointly support the back mold The weight of the formwork plate.

Preferably, the back mold of the injection mold further comprises a backing plate fixing rod, and the backing plate fixing rods are arranged on both sides of the back mold fixing plate and are used to fix the ejecting backing plate and the ejecting plate.

Preferably, the injection mold further includes a cooling device, the cooling device includes a water inlet and outlet and a cooling water channel, the cooling water channels are respectively arranged inside the front mold core and the rear mold core, and the water inlet and outlet are respectively arranged in the front mold The right side of the mold core and the rear mold core are respectively communicated with the cooling water channel.

The advantages of the present invention are: the front mold of the injection mold and the rear mold of the injection mold are arranged, and the front mold of the injection mold and the rear mold of the injection mold are matched to form a cavity, and in the process of plastic injection, the diameter of the flow channel is gradually increased by changing the diameter of the injection mold. To change the flow rate of the rubber material, so as to improve the phenomenon that the rubber material produces color streaks and printing on the injection molded product, and is conducive to the separation of the rubber material from the flow channel after condensation and solidification. The hot nozzle is set to prevent the molten rubber from solidifying during the injection molding process; a simple ejection mechanism is set up, which can easily eject the product after the product is cooled, further improving the production efficiency of the product.

Description of drawings

Fig. 1 is the structural representation of the injection mold of the present invention;

Fig. 2 is the exploded view of the injection mould of the present invention;

Fig. 3 is another exploded view of the injection mold of the present invention;

Fig. 4 is the sectional view of the injection mold of the present invention;

Fig. 5 is the structural representation of the ejector pin of the injection mold of the present invention;

6 is a schematic diagram of the front and rear cavities of the injection mold of the present invention.

The reference numbers in the description are as follows:

1. Positioning ring; 2. Front mold fixing plate; 3. Front mold core; 4. Ejection guide pin; 5. Product; 6. Guide pin; 7. Water inlet and outlet; 8. Back mold base plate; 9. Thimble ; 10, backing plate fixing rod; 11, positioning pin; 12, rear mold fixing plate; 13, rear mold supporting rod; 14, rear mold spacer; 15, ejecting backing plate; 16, ejecting plate; A reset rod; 18, back mold core; 19, second reset rod; 20, glue inlet; 21, runner; 22, hot nozzle; 23, cooling water channel; 24, front mold cavity; 25, rear mold cavity .

Detailed ways

In order to facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the ones described herein. Rather, these embodiments are provided so that a thorough and complete understanding of the present disclosure is provided.

In order to better explain the above-mentioned injection mold, so as to better understand the concept of the above-mentioned injection mold, as shown in Figure 1, an injection mold includes: a front mold of the injection mold and a rear mold of the injection mold, and a front mold of the injection mold It is used to fit with the back mold of the injection mold.

It should be noted that the front mold of the injection mold and the rear mold of the injection mold cooperate to form a cavity. During the injection molding process, the diameter of the runner gradually increases from the rubber inlet 20 to the hot nozzle 22, so that the molten rubber is in the runner. Maintaining a uniform pressure gradient is conducive to the flow of the rubber compound, reducing the injection pressure, and improving the phenomenon that the rubber compound produces stamping marks on the product, and the cross-sectional shape of the runner is conical, which is conducive to the rubber compound being separated from the runner after condensation and solidification. The hot nozzle 22 is provided to prevent the molten rubber from solidifying during the injection molding process; the simple ejector pin 9 can easily eject the product 5 after the product is cooled, further improving the production efficiency of the product.

As shown in Figure 2, Figure 4 and Figure 6, the front mold of the injection mold includes a front mold fixing plate 2, a positioning ring 1, a glue inlet 20, a front mold core 3, a flow channel 21 and a hot nozzle 22, and a positioning ring 1. It is arranged on the front mold fixing plate 2, the glue inlet 20 is communicated with the positioning ring 1, the front mold core 3 is placed under the front mold fixing plate 2, and a front mold cavity 24 is opened on the front mold core 3, The flow channel 21 runs through the front mold fixing plate 2 and the front mold core 3. The flow channel 21 connects the glue inlet 20 and the front mold cavity 24. The diameter of the flow channel 21 at the end of the front mold cavity 24 is larger than the diameter of the flow channel 21 at the end of the glue inlet 20. . The rear mold of the injection mold includes a rear mold fixing plate 12, an ejector backing plate 15, an ejector plate 16, a rear mold base plate 8, a rear mold core 18 and two rear mold spacers 14. The two rear mold spacers 14 are respectively Set on both ends of the rear mold fixing plate 12, the ejecting pad 15 is placed on the rear mould fixing plate 12, the ejecting plate 16 is placed on the ejecting pad 15, and the ejecting plate 16 and the ejecting pad 15 Both are placed between the two rear mold spacers 14, the two ends of the rear mold seat plate 8 are respectively placed on the two rear mold spacers 14, and a rear mold core 18 is provided on the rear mold seat plate 8, and the rear mold seat plate 8 is provided with a rear mold core 18. The mold core 18 is provided with a rear mold cavity 25, and the front mold core 3 is attached to the rear mold core 18, so that the front mold cavity 24 communicates with the rear mold cavity 25 to form a product molding cavity.

As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 6, after the front mold core 3 and the rear mold core 18 are attached, the front mold cavity 24 and the rear mold cavity 25 are communicated to form a product cavity. After the glue material is injected from the glue inlet 20, after passing through the flow channel 21 and the hot nozzle 22, it enters the cavity, and is cooled and shaped to form the product 5.

It should be further explained that when the rubber material enters the flow channel 21 from the rubber inlet 20, the diameter of the flow channel gradually increases from the rubber inlet 20 to the hot nozzle 22, which reduces the flow rate and pressure of the rubber material, thereby improving the The phenomenon that the sizing material produces printing marks on the product 5 is avoided, and the cross-sectional shape of the flow channel 21 is conical, which is favorable for the sizing material to be separated from the flow channel 21 after it is condensed and solidified. The hot nozzle 22 is provided to prevent the molten rubber from solidifying during the injection molding process; the ejector pin 9 is provided with a simple ejector mechanism to easily eject the product after the product is cooled, further improving the production efficiency of the product.

In the process of attaching the front mold core 3 to the rear mold core 18, in order to improve the accuracy of the attaching, for example, the front mold of the injection mold further includes a guide mechanism, the guide mechanism includes four guide pins 6, four guide The pins 6 are respectively arranged at the four corner positions of the front die fixing plate 2; the rear die base plate 8 is provided with four guide holes matching with the guide pins 6, and the four guide pins 6 are respectively provided with four guide holes. The front mold of the injection mold and the rear mold of the injection mold respectively include six ejection guide pins 4, and the ejection guide pins 4 are respectively arranged on the front mold fixing plate 2 and the rear mold base plate 8; the front mold fixing plate 2 and the rear mold The seat plate 8 is respectively provided with six ejection guide holes matched with the ejection guide pins 4, and the included angle between two adjacent ejection guide holes is 60°; The positioning member includes four positioning pins 11, and the four positioning pins 11 are respectively arranged at the four corner positions of the rear mold fixing plate 12; There are four positioning holes respectively, and the four positioning pins 11 correspond to the four positioning holes respectively, that is, the four positioning pins 11 penetrate through the two rear mold spacers 14 to connect the rear mold fixing plate 12 and the rear mold base plate 8; injection molding The rear mold of the mold also includes two backing plate fixing rods 10 . The two backing plate fixing rods 10 are arranged on both sides of the rear mold fixing plate 12 for fixing the ejecting backing plate 15 and the ejecting plate 16 .

As shown in Fig. 2, Fig. 4 and Fig. 5, in order to eject the formed product from the rear cavity 25, the injection mold further includes an ejector device, and the ejector device includes an ejector pin 9, a first reset rod 17, a second reset rod 19. The first reset rod 17 and the second reset rod 19 are respectively arranged at the four end corners of the ejector backing plate 15, and the ejector pin 9 is arranged at the center of the rear mold fixing plate 12; the injection mold also includes a cooling device, a cooling device Including the water inlet and outlet 7 and the cooling water channel 23, the cooling water channel 23 is respectively arranged inside the front mold core 3 and the rear mold core 18, and the water inlet and outlet 7 are respectively arranged on the right side of the front mold core 3 and the rear mold core 18, and The cooling water channel 23 is connected; in this way, by raising the ejector backing plate 15, the reset rod 17 rises and the reset rod 19 rises, so that the front mold core 3 is separated from the rear mold core 18, and then the product is removed from the rear mold cavity through the ejector pin 9. 25 tops out.

In the injection mold of the present invention, the front mold of the injection mold and the rear mold of the injection mold are arranged, and the front mold of the injection mold and the rear mold of the injection mold cooperate to form a cavity. The flow rate of the material is increased, so as to improve the phenomenon that the rubber compound produces color streaks and printing on the injection molded product, and the cross-sectional shape of the flow channel 21 is conical, which is conducive to the separation of the rubber compound from the flow channel after condensation and solidification. The hot nozzle 22 is provided to prevent the molten rubber from solidifying during the injection molding process; the ejector pin 9 is provided with a simple ejector mechanism to easily eject the product after the product is cooled, further improving the production efficiency of the product.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

An injection mold, comprising a front mold of the injection mold and a rear mold of the injection mold, wherein the front mold of the injection mold and the rear mold of the injection mold are connected with each other in an upper and a lower arrangement, and is characterized in that:

The front mold of the injection mold is provided with a flow channel (21) from top to bottom, the upper end of the flow channel (21) is connected with the glue inlet (20), the lower end is connected with the hot nozzle (22), and the The diameter gradually increases from the glue inlet (20) to the hot nozzle (22), and its shape is conical. The front mold of the injection mold is also provided with a front mold core (3) that can move up and down. The middle part of (3) is provided with a front mold cavity (24), and the flow channel (21) communicates with the front mold cavity (24) through the hot nozzle (22);

The rear mold of the injection mold is provided with a rear mold core (18), the rear mold core (18) is provided with a rear mold cavity (25), and the rear mold cavity (25) and the front mold cavity (24) communicate with each other and join together to form the molding cavity of the product (5);

The rear mold of the injection mold is also provided with an ejector device, the ejector device is arranged at the bottom of the rear mold core (18), and the ejector device can eject the front mold core (3) through a reset rod. Open and separate it from the back mold core (18), and push out the molded product (5) through the ejector pin (9), so that the product (5) is separated from the back mold cavity (25) of the back mold core (18). .
The injection mold according to claim 1, characterized in that: the front mold of the injection mold comprises a positioning ring (1), a front mold fixing plate (2) and a front mold core (3), and the positioning ring (1) ) in the front mold fixing plate (2), the bottom side of the front mold fixing plate (2) is provided with a front mold core (3) through a reset rod, and the retractability of the reset rod is provided on the rear mold seat plate (8). ), the front mold cavity (24) of the front mold core (3) is connected to the glue inlet (20) provided on the positioning ring (1) through the flow channel (21).
The injection mold according to claim 1, characterized in that: the rear mold of the injection mold comprises a rear mold fixing plate (12), a rear mold base plate (8), a rear mold core (18), and a rear mold spacer (14) and an ejecting device, the two sides of the rear mold fixing plate (12) are respectively provided with rear mold spacers (14), and the middle position of the rear mold spacer (14) is provided with an ejecting device, so The top side of the ejecting device is provided with a rear mold seat plate (8) through a rear mold spacer (14), and a rear mold core (18) is arranged in the rear mold seat plate (8).
The injection mold according to claim 1 or 3, wherein the ejection device comprises an ejector pin (9), a reset rod, an ejection pad (15) and an ejection plate (16), and the ejection pad The plate (15) is arranged on the top side of the rear mold fixing plate (12), and the ejector backing plate (15) extends through the ejector plate (16) and the rear mold base plate (8) and the front plate (15) through the retractable return rod. The mold core (3) is connected, the reset rod includes a first reset rod (17) and a second reset rod (19), and the first reset rod (17) penetrates through the ejector plate (16) and penetrates the rear mold seat plate The second reset rod (19) of (8) is connected, the second reset rod (19) is connected with the front mold core (3), and the ejector pin (9) is arranged in the rear mold fixing plate (12). (9) Passing through the ejector backing plate (15), the ejector plate (16), the rear mold base plate (8) and the rear mold core (18) in order to contact the product (5).
The injection mold according to claim 1, characterized in that: the front mold of the injection mold further comprises a guide mechanism, and the guide mechanism is a guide pin (6), and the guide pin (6) penetrates and is fixed to the front mold fixing plate ( 2) and the guide hole of the rear die base plate (8).
The injection mold according to claim 2 or 5, wherein an ejection guide pin (4) is provided between the front mold fixing plate (2) and the rear mold base plate (8), and the ejection guide pin ( 4) Corresponding to the ejection guide holes respectively opened in the front mold fixing plate (2) and the rear mold base plate (8), the ejection guide pins (4) are arranged in the ejection guide holes, and the ejection guide pins (4) are arranged in the ejection guide holes. There are six holes, and the included angles between two adjacent ejection guide holes are distributed at 60°.
The injection mold according to claim 1, wherein the rear mold of the injection mold further comprises a positioning member, and the positioning member is a positioning pin (11), and the positioning pin (11) penetrates through the rear mold spacer (11). 14) and the rear mold seat plate (8), so that the rear mold spacer (14) and the rear mold seat plate (8) are connected and fixed with the rear mold fixing plate (12).
The injection mold according to claim 1, wherein the rear mold of the injection mold further comprises a rear mold support rod (13), and the rear mold support rod (13) is arranged on the rear mold fixing plate (12) and the rear mold base Between the plates (8), the rear mold support rod (13) and the rear mold spacer (14) jointly support the weight of the rear mold base plate (8).
The injection mold according to claim 1, characterized in that: the back mold of the injection mold further comprises a backing plate fixing rod (10), and the backing plate fixing rod (10) is arranged on both sides of the back mold fixing plate (12), Used to fix the ejector backing plate (15) and the ejector plate (16).
The injection mold according to claim 1, characterized in that: the injection mold further comprises a cooling device, and the cooling device comprises a water inlet and outlet (7) and a cooling water channel (23), and the cooling water channel (23) is respectively arranged in the Inside the front mold core (3) and the rear mold core (18), the water inlet and outlet (7) are respectively arranged on the right side of the front mold core (3) and the rear mold core (18), and are respectively connected with the water inlet and outlet. The cooling water channel (23) is communicated.