CN221850875U - Mould structure for improving rib shrinkage - Google Patents

Abstract

The utility model discloses a mold structure for improving rib shrinkage, which relates to the field of molds, and comprises a female mold core and a male mold core, wherein cavity grooves are formed on the matching surfaces of the female mold core and the male mold core so as to form a product forming cavity after the female mold core and the male mold core are assembled; a rib groove and a sealing groove are also arranged in the cavity groove of the male die core, and the rib groove is positioned in a sealing area surrounded by the sealing groove; the insert pin is arranged in the male die core, an air gap is formed between the insert pin and the male die core, and the top end of the insert pin is positioned in the sealing area, so that air in the air gap flows out of the sealing area. According to the utility model, the female die core and the male die core are matched to form the product forming cavity to form the product, the rib grooves in the cavity grooves of the male die core are used for forming rib parts of the product, and the rib grooves are positioned in the sealing area surrounded by the sealing grooves, and the sealing area is inflated through the air passing gap in the forming pressure maintaining process so as to generate jacking force in the sealing area, so that the problem that the rib parts are easy to generate pits is solved.

Description

A mold structure for improving rib shrinkage

Technical Field

The utility model relates to the technical field of plastic molds, in particular to a mold structure for improving rib shrinkage.

Background Art

Plastic mold is the abbreviation of a combined mold used for compression molding, extrusion molding, injection molding, blow molding and low-foaming molding. The coordinated changes of the male and female molds and the auxiliary molding system of the mold can produce a series of plastic parts of different shapes and sizes.

During use, when the plastic cools from a molten state to a solid, the cooling is not completed at the same time due to the excessive thickness of the material. The last cooled parts are the thick parts, and a small pit will appear in this part (the pit is more obvious due to the sudden change in thickness where the reinforcing ribs are set). Shrinkage is related to the thickness of the body. When the thickness of the RIB (rib) does not exceed 0.8 times the thickness of the material, shrinkage generally does not occur. Plate-like products usually have a thinner body thickness and a thicker RIB. Plate-like products generally have pits. How to solve the shrinkage problem of plate-like products during plastic molding is the direction of our research.

Summary of the invention

The utility model aims to provide a mold structure for improving rib shrinkage, so as to solve the problem in the prior art that ribs are prone to shrinkage and pits appear when plate-shaped products are formed.

In order to achieve the above purpose, the utility model is implemented by adopting the following technical solutions:

A mold structure for improving rib shrinkage, comprising a female mold core and a male mold core, wherein the mating surfaces of the female mold core and the male mold core are both provided with a cavity groove, so as to form a product molding cavity after the female mold core and the male mold core are molded together;

The cavity groove of the male mold core is also provided with a rib groove and a sealing groove, and the rib groove is located in the sealing area surrounded by the sealing groove;

An insert pin is arranged in the male mold core, and a gas gap is formed between the insert pin and the male mold core. The top end of the insert pin is located in the sealing area, so that the gas in the gas gap flows out from the sealing area.

Furthermore, the sealing groove is in a circular, square or polygonal shape.

Furthermore, the male mold core is provided with a pin inserting groove which runs through the male mold core in its height direction, the pin inserting groove is arranged in the pin inserting groove, and the air gap is formed between the outer ring of the pin inserting groove and the pin inserting groove.

Furthermore, the male mold core is connected to a male mold plate, an air channel is provided on the male mold plate, and one end of the air channel is connected to the needle inserting groove.

Furthermore, a sealing groove body is provided on one side surface of the male mold plate close to the male mold core, the air passage is located in the sealing groove body, and a sealing ring is connected to the sealing groove body.

Furthermore, a positioning groove connected to the pin inserting groove is provided on one side surface of the male mold core close to the male mold plate, and the size of the positioning groove is larger than the size of the pin inserting groove;

The bottom end of the inlay pin is connected with a positioning block, and the positioning block is arranged in the positioning groove.

Furthermore, the female mold core is connected to the female mold plate, and the female mold plate is provided with a slide groove along its length direction;

A sliding block matched with the sliding groove is provided on one side surface of the male template close to the female template.

Furthermore, the top end of the inlay pin is close to the rib groove.

According to the above technical solution, the beneficial effects of the utility model are:

The mold structure of the present application forms a product molding cavity by combining the female mold core and the male mold core to form a product molding cavity, and the rib groove in the cavity groove of the male mold core is used to form the rib part of the product, and the rib groove is located in the sealing area surrounded by the sealing groove. During the molding and pressure holding process, air is inflated into the sealing area through the air gap to generate a lifting force in the sealing area, thereby solving the problem of pits easily appearing in the rib part.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is an overall schematic diagram of the mold structure of the present application;

FIG2 is an enlarged view of point A in FIG1 ;

FIG3 is a schematic diagram of a partial structure of FIG2 ;

FIG4 is a schematic diagram of the state of the mold of the present application at different stages when forming a product;

FIG. 5 is a schematic diagram of a product formed in the present application.

Among them: 1. Upper fixed plate; 2. Female mold core; 3. Lower fixed plate; 4. Male mold plate; 41. Airway; 42. Sealing ring; 5. Male mold core; 51. Rib groove; 52. Sealing groove; 6. Insert pin; 61. Air gap; 62. Positioning block; 7. Slider; 8. Upper ejector plate; 9. Lower ejector plate; 10. Mold foot.

DETAILED DESCRIPTION

In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

It should be noted that in the description of the present invention, the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention rather than requiring that the present invention must be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. The terms "front", "rear", "left", "right", "up", and "down" used in the description of the present invention refer to the directions in the accompanying drawings, and the terms "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.

As shown in Figures 1 to 3, the present application discloses a mold structure for improving rib shrinkage, including a female mold core 2 and a male mold core 5, and the mating surfaces of the female mold core 2 and the male mold core 5 are both provided with a cavity groove to form a product molding cavity after the female mold core 2 and the male mold core 5 are molded together. The product molding cavity is a cavity for molding a product. After the female mold core 2 and the male mold core 5 are molded together, molten plastic is injected into the product molding cavity to maintain pressure to form a product. The shape of the product molding cavity is designed according to the shape of the product.

The cavity groove of the male mold core 5 is also provided with a rib groove 51 and a sealing groove 52, and the rib groove 51 is located in the sealing area surrounded by the sealing groove 52; the male mold core 5 is provided with an insert pin 6, and a gas gap 61 is formed between the insert pin 6 and the male mold core 5, and the top of the insert pin 6 is located in the sealing area, so that the gas in the gas gap 61 flows out from the sealing area. Furthermore, the top of the insert pin 6 is close to the rib groove 51 to ensure that the pressurized gas has a better effect on the rib position of the product.

The rib groove 51 is used for forming the ribs of the product, and its shape is set according to actual needs; the sealing area surrounded by the sealing groove 52 can ensure that the pressurized gas entering is within the sealing area and will not flow out of the sealing area. The shape of the sealing groove 52 is set according to the shape of the rib groove 51, which can be circular, square, polygonal or irregular, etc. The depth of the sealing groove 52 is relatively small, less than the depth of the rib groove 51. When the product is formed, ribs are formed in the rib groove 51, and the plastic filled in the sealing groove 52 further ensures that the pressurized gas will not flow out of the sealing area, thereby ensuring the working effect of the pressurized gas.

The male mold core 5 is provided with a pin inserting groove which runs through the height direction thereof, the pin inserting groove 6 is arranged in the pin inserting groove, and a gas passing gap 61 is formed between the outer ring of the pin inserting groove 6 and the pin inserting groove. The gas in the gas passing gap 61 can enter the bottom surface of the product through the top to lift the bottom surface of the product, and the specific position is the bottom surface of the product in the sealing area, that is, near the rib forming part of the product.

In order to facilitate the installation of the insert pin 6, a positioning groove connected to the insert pin groove is provided at the bottom of the insert pin groove on the male mold core 5. The size of the positioning groove is larger than that of the insert pin groove. A positioning block 62 is connected to the bottom end of the insert pin 6. When installing the insert pin 6, the small end of the insert pin 6 is inserted into the insert pin groove, and the positioning block 62 is engaged in the positioning groove to achieve the installation of the insert pin 6. After the male mold core 5 is connected to the male mold plate 4, the lower part of the insert pin 6 can be automatically limited to ensure the connection effect of the insert pin 6 in the male mold core 5.

Furthermore, an air channel 41 is designed on the male mold plate 4, one end of the air channel 41 is connected to the needle insertion groove, and the other end is connected to the external air source, so that the pressurized gas enters the air channel 41, the air gap 61 and the sealing area of the product molding cavity in sequence.

Since there is a connecting gap between the male mold plate 4 and the male mold core 5, in order to prevent the pressurized gas from leaking out, a sealing groove body is provided on the side surface of the male mold plate 4 close to the male mold core 5, and the airway 41 is located in the sealing groove body. A sealing ring 42 is connected to the sealing groove body. The provided sealing ring can ensure that the pressurized gas effectively enters the air gap 61 to prevent the pressurized gas from leaking out.

In a further embodiment, the female mold core 2 is connected to the female template 1, and the female template 1 is provided with a slide groove along its length direction; a slider 7 adapted to the slide groove is provided on one side of the male template 4 close to the female template 1. The slider 7 can play a guiding role in the process of closing the mold to ensure the smooth closing of the mold. When demolding, the slider 7 can assist in demolding to prevent the mold from getting stuck.

The pressure-holding molding process is shown in FIG4 . Before molding, as shown in FIG4a , the bottom surface of the product is flat. During molding, as shown in FIG4b , high-pressure gas is introduced to the bottom surface of the product through the air gap 61. After molding, as shown in FIG4c , the bottom surface of the product is warped upward, and the warped surface is the back surface of the product, so as to ensure that the front surface of the product is flat and prevent pits from appearing on the front surface of the product.

FIG5 is a schematic diagram of a molded product. The area surrounded by the circular convex rib on the left and the arc-shaped convex rib on the right is the sealing area. The convex rib is formed by a sealing groove 52 , and the rib portion in the sealing area is formed by a rib groove 51 .

In one embodiment, it also includes an upper ejector plate 8, a lower ejector plate 9 and a mold foot 10. The upper and lower ejector plates are locked together, and the mold foot 10 is locked together with the male mold plate 4 and the lower fixed plate 3. After the upper and lower ejector plates are locked together, they are connected between the male mold plate and the lower fixed plate through the EGP, and the upper and lower fixed plates are on the EGP (cylindrical).

It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the embodiments disclosed above are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims (8)

1. A mold structure for improving rib shrinkage, characterized in that it comprises a female mold core (2) and a male mold core (5), wherein the mating surfaces of the female mold core (2) and the male mold core (5) are both provided with a cavity groove so as to form a product molding cavity after the female mold core (2) and the male mold core (5) are molded together; A rib groove (51) and a sealing groove (52) are further provided in the cavity groove of the male mold core (5), wherein the rib groove (51) is located in a sealing area surrounded by the sealing groove (52); An insert pin (6) is provided in the male mold core (5), an air gap (61) is formed between the insert pin (6) and the male mold core (5), and the top end of the insert pin (6) is located in the sealing area so that the gas in the air gap (61) flows out of the sealing area. 2. The mold structure for improving rib shrinkage according to claim 1, characterized in that the shape of the sealing groove (52) is circular, square or polygonal. 3. According to the mold structure for improving rib shrinkage as described in claim 1, it is characterized in that the male mold core (5) is provided with a pin inserting groove running through the male mold core (5) in its height direction, the pin inserting groove (6) is arranged in the pin inserting groove, and the air gap (61) is formed between the outer ring of the pin inserting groove (6) and the pin inserting groove. 4. The mold structure for improving rib shrinkage according to claim 3, characterized in that the male mold core (5) is connected to the male mold plate (4), and the male mold plate (4) is provided with an air channel (41), and one end of the air channel (41) is connected to the needle insertion groove. 5. The mold structure for improving rib shrinkage according to claim 4, characterized in that a sealing groove is provided on one side of the male mold plate (4) close to the male mold core (5), the air channel (41) is located in the sealing groove, and a sealing ring (42) is connected to the sealing groove. 6. The mold structure for improving rib shrinkage according to claim 4, characterized in that a positioning groove connected to the pin inserting groove is further provided on a side surface of the male mold core (5) close to the male mold plate (4), and the size of the positioning groove is larger than the size of the pin inserting groove; The bottom end of the inlay pin (6) is connected to a positioning block (62), and the positioning block (62) is arranged in the positioning groove. 7. The mold structure for improving rib shrinkage according to claim 4, characterized in that the mother mold core (2) is connected to the mother mold plate (1), and the mother mold plate (1) is provided with a slide groove along its length direction; A sliding block (7) adapted to the sliding groove is provided on a side surface of the male template (4) close to the female template (1). 8. The mold structure for improving rib shrinkage according to claim 1, characterized in that the top end of the insert pin (6) is close to the rib groove (51).