A mold overflow exhaust structure

Abstract

The present invention provides a mold overflow venting structure, which belongs to the field of mold technology. It solves the problem of low product quality of existing injection molds. The mold includes an upper mold and a lower mold, and a molding cavity is provided between the upper mold and the lower mold. The overflow venting structure includes an exhaust ring groove that is recessed upward on the bottom surface of the upper mold, an exhaust channel located in the upper mold, and an overflow groove, an overflow recess, and an exhaust recess that are all arranged on the top surface of the lower mold and recessed downward. The overflow recess and the exhaust recess are respectively located on both sides of the overflow groove, and the overflow recess and the exhaust recess are staggered. The overflow groove is connected to the molding cavity through the overflow recess, and the exhaust ring groove is located above the exhaust recess. When the upper mold and the lower mold are closed, the exhaust recess is connected to the exhaust ring groove, and the bottom of the exhaust channel is connected to the exhaust ring groove, and the top passes through the upper mold. The mold overflow venting structure has the advantage of improving product quality.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to a mold overflow exhaust structure. Background Art

[0002] Molds are tools used to make molded products, including injection molds and die-casting molds. Injection molds are used to inject heated and molten plastic into the molding cavity between the upper mold and the lower mold by the injection molding machine under high pressure, and then the molded product is obtained after cooling and solidification. Die-casting molds are used to fill the molten metal into the mold cavity at a low or high speed. The mold has a movable cavity surface. As the molten metal cools, it is pressurized and forged, which not only eliminates the shrinkage and porosity defects of the blank, but also makes the internal structure of the blank reach the broken grains in the forged state.

[0003] However, when the existing injection mold is used to mold the finished product, there is a problem of too much molten plastic being injected, resulting in bulging and burning problems on the product, thereby reducing product quality; and when the existing die-casting mold is used to mold the finished product, there is a problem that the gas in the cavity cannot be discharged in time and the molten metal flows to the gap between the upper mold and the lower mold, resulting in air holes and slag inclusion problems in the finished product, thereby reducing product quality. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a mold overflow exhaust structure, the technical problem to be solved is how to improve product quality.

[0005] The objective of the present invention can be achieved through the following technical scheme: a mold overflow venting structure, the mold includes an upper mold and a lower mold, and a molding cavity is provided between the upper mold and the lower mold, and is characterized in that the overflow venting structure includes an exhaust ring groove which is recessed upward on the bottom surface of the upper mold, an exhaust channel located in the upper mold, and an overflow groove, an overflow recess and an exhaust recess which are all arranged on the top surface of the lower mold and recessed downward, the overflow recess and the exhaust recess are respectively located on both sides of the overflow groove and the overflow recess and the exhaust recess are staggered, the overflow groove is connected with the molding cavity through the overflow recess, the exhaust ring groove is located above the exhaust recess, and when the upper mold and the lower mold are closed, the exhaust recess is connected with the exhaust ring groove, the bottom of the exhaust channel is connected with the exhaust ring groove, and the top passes through the upper mold.

[0006] When the upper mold and the lower mold are closed, raw materials are injected into the molding cavity. During this process, the gas in the molding cavity is squeezed out through the overflow notch, the overflow groove, the exhaust notch, the exhaust ring groove and the exhaust channel, so as to avoid the problems of air holes in the product and improve the product quality. Since the overflow notch is located on the top surface of the lower mold and is recessed downward, the overflow notch is located below the gap between the upper mold and the lower mold in the vertical direction. When a certain amount of raw materials is injected into the molding cavity, the excess raw materials enter the overflow groove through the overflow notch, so that the excess raw materials will not penetrate into the gap between the upper mold and the lower mold, so as to avoid the problems of slag inclusion and burning on the edge of the product. The excess raw materials overflow into the overflow groove through the overflow notch, so that the product in the molding cavity does not have the problem of bulging, so as to improve the product quality. The overflow notch and the exhaust notch are located on both sides of the overflow trough, and the overflow notch and the exhaust notch are staggered to ensure that the gas in the molding cavity is discharged through the exhaust notch. When the raw material in the molding cavity overflows from the overflow notch into the overflow trough, it is not easy to enter the exhaust notch, and the exhaust notch will not be blocked, so as to ensure the discharge of gas, prevent product problems such as pores and bulges, and improve product quality. The exhaust ring groove is located above the exhaust notch, and the hot gas rises, so that the gas can be discharged better. Even if the raw material in the molding cavity overflows too much, it is not easy to hinder the discharge of gas due to the weight of the raw material and the raw material being located at the bottom, so as to prevent product problems such as pores and bulges, and improve product quality.

[0007] In the above-mentioned mold overflow exhaust structure, the overflow groove is in the shape of a long strip or an arc, the overflow notch is located in the middle of one side of the overflow groove, and the exhaust notch is located at the end of one end of the overflow groove. This structure ensures that the gas in the molding cavity is discharged through the overflow notch, the overflow groove and the exhaust notch, and prevents the raw material overflowing from the overflow notch from directly splashing into the exhaust notch, and the exhaust notch will not be blocked, thereby ensuring the discharge of gas, preventing product problems such as pores and bulges, and improving product quality.

[0008] In the above-mentioned mold overflow venting structure, the overflow groove is a structure with a small bottom and a large opening, and the groove wall of the overflow groove is arranged obliquely from bottom to top. This structure allows the raw materials to enter the overflow groove better, so that the overflow groove can better store the raw materials, and after the raw materials are cooled, the product and the raw materials cooled at the overflow notch are not easy to break, and it is convenient to take out, thereby ensuring product quality.

[0009] In the above-mentioned mold overflow venting structure, the depth of the venting recess is less than the depth of the overflow recess, and the depth of the overflow recess is much less than the depth of the overflow groove. The depth of the venting recess and the overflow recess itself is relatively shallow, which will not greatly reduce the strength of the lower mold top surface at this point. When the upper mold and the lower mold are molded together, the lower mold top surface at this point is not easily damaged; the depth of the venting recess is less than the depth of the overflow recess, which ensures that the exhaust is not easy to enter the venting recess while the raw material is not easy to enter; the depth of the overflow groove can be ten times the depth of the overflow recess, so that the overflow groove can store more raw materials.

[0010] In the above-mentioned mold overflow exhaust structure, the mold has a pouring port, the pouring port is connected to the molding cavity, the overflow recess is far away from the pouring port, and the overflow recess and the pouring port are arranged opposite to each other. This structure allows the gas in the molding cavity to be discharged better, and at the same time, the raw material will overflow from the overflow recess only after the molding cavity is basically filled, thereby ensuring product quality.

[0011] In the above-mentioned mold overflow exhaust structure, the exhaust channel is arranged in the vertical direction, and the exhaust channel passes through the top of the upper mold or the top of the exhaust channel turns and then passes through the side of the upper mold.

[0012] In the above-mentioned mold overflow venting structure, the top surface of the lower mold has a plurality of venting grooves which are recessed downward, all of the venting grooves are arranged in a ring shape around the molding cavity, two adjacent venting grooves are spaced apart, the venting ring groove is annular and the venting ring groove is located above the venting groove, and when the upper mold and the lower mold are closed, all of the venting grooves are connected to the venting ring groove, and the venting groove is connected to the molding cavity through the gap between the upper mold and the lower mold. The top of the exhaust channel is externally connected to a vacuum pump, and the vacuum pump evacuates the molding cavity through the exhaust channel and the exhaust ring groove. The exhaust groove is recessed on the top surface of the lower mold. Relative to the gap between the upper mold and the lower mold, the spatial volume of the exhaust groove is large enough. The exhaust groove is set similarly to a transfer space, so that the vacuum pump first evacuates the exhaust groove, and the gas in the molding cavity can enter the exhaust groove through the gap between the upper mold and the lower mold more quickly and be evacuated, thereby improving the vacuuming efficiency of the molding cavity and accelerating the flow of raw materials in the molding cavity. All the exhaust grooves are arranged in a ring around the molding cavity to make the gas flow even, thereby making the raw material flow smooth and improving the processing quality and processing efficiency of the product; and when opening the mold, the vacuum pump stops evacuating, and the exhaust ring groove and the exhaust groove are filled with gas, thereby increasing the pressure between the upper mold and the lower mold, making the pressure difference inside and outside the mold basically the same, thereby saving effort in opening the mold.

[0013] In the above-mentioned mold overflow exhaust structure, the exhaust notch and the exhaust groove are both in the shape of long strips, and are arranged crosswise with the exhaust ring groove, and the lengths of the exhaust notch and the exhaust groove are both greater than the width of the exhaust ring groove. This structure enables the exhaust groove to play a better role as an exhaust and air intake transfer station, improves the efficiency of exhaust and inflation, and improves the product processing efficiency.

[0014] In the above-mentioned mold overflow exhaust structure, the exhaust groove has the same depth as the exhaust notch, and the depths of the exhaust groove and the exhaust notch are both between 0.2-0.4 mm. Without damaging the strength of the top of the lower mold, the exhaust groove plays a better role as an exhaust and air intake transfer station, improves the exhaust and inflation efficiency, and improves the product processing efficiency.

[0015] In the above-mentioned mold overflow exhaust structure, a sealing ring is provided between the lower mold and the lower mold, and the sealing ring includes a protruding clamping portion, and a concave annular clamping groove is provided on the top surface of the lower mold or the bottom surface of the upper mold, and the clamping portion is embedded and clamped in the annular clamping groove. When the upper mold and the lower mold are molded together, the exhaust ring groove, the overflow groove, the overflow notch, the exhaust notch and the exhaust groove are all located in the space surrounded by the annular clamping groove. The sealing ring plays a sealing role, so that the gas in the mold flows in a set direction, thereby improving the product quality.

[0016] Compared with the prior art, the mold overflow exhaust structure provided by the present invention has the following advantages:

[0017] 1. The overflow exhaust structure prevents the product from having problems such as pores, bulges, slag inclusions and burning through the coordination of the overflow notch, overflow groove, exhaust notch, exhaust ring groove and exhaust channel, thereby improving product quality.

[0018] 2. The overflow exhaust structure is provided with an exhaust groove. When processing the product, the gas in the molding cavity can be uniformly and faster extracted through the vacuum pump, so that the raw materials in the molding cavity flow smoothly, and the processing quality and efficiency of the product are improved; when the mold is opened, the external gas enters the exhaust groove through the exhaust channel and the exhaust ring groove, thereby increasing the pressure between the upper mold and the lower mold, making the pressure difference inside and outside the mold basically the same, so that the mold opening is labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the top surface of the lower mold of this mold.

[0020] Figure 2 It is a structural schematic diagram of the overflow groove of the overflow exhaust structure of the mold.

[0021] Figure 3 It is a structural schematic diagram of the bottom surface of the upper mold of this mold.

[0022] Figure 4 It is a cross-sectional view of the mold at the exhaust groove.

[0023] In the figure, 1, upper mold; 2, lower mold; 3, molding cavity; 4, exhaust ring groove; 5, exhaust channel; 6, overflow groove; 7, overflow notch; 8, exhaust notch; 9, pouring gate; 10, exhaust groove; 11, sealing ring; 111, clamping part; 12, annular clamping groove. DETAILED DESCRIPTION

[0024] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0025] like Figure 1 , Figure 3 , Figure 4 As shown, the mold includes an upper mold 1 and a lower mold 2, with a molding cavity 3 between the upper mold 1 and the lower mold 2, and the overflow exhaust structure includes an exhaust ring groove 4, an exhaust channel 5, an overflow groove 6, an overflow recess 7, an exhaust recess 8 and an exhaust groove 10.

[0026] The bottom surface of the upper mold 1 is recessed upward to form an exhaust ring groove 4, which is annular. The exhaust channel 5 is located in the upper mold 1, and the exhaust channel 5 is arranged in the vertical direction. The bottom of the exhaust channel 5 is connected to the exhaust ring groove 4. In this embodiment, the top of the exhaust channel 5 passes through the top of the upper mold 1 and at the same time, the top of the exhaust channel 5 turns and passes through the side of the upper mold 1. In actual production, the top of the exhaust channel 5 passes through the top of the upper mold 1 or the top of the exhaust channel 5 turns and passes through the side of the upper mold 1. The top of the exhaust channel 5 is used to connect an external vacuum pump.

[0027] The overflow groove 6, overflow recess 7, exhaust recess 8 and exhaust groove 10 are all recessed on the top surface of the lower mold 2. In the present embodiment, the number of the overflow groove 6, overflow recess 7 and exhaust recess 8 is two, and the number of the exhaust groove 10 is twenty-one. The twenty-one exhaust grooves 10 are arranged in a ring around the molding cavity 3, and two adjacent exhaust grooves 10 are spaced apart. In actual production, the number of the overflow groove 6, overflow recess 7 and exhaust recess 8 can be one or three, and the number of the exhaust grooves 10 can be sixteen or thirty-six.

[0028] like Figure 2As shown, the overflow notch 7 and the exhaust notch 8 are respectively located on both sides of the overflow groove 6 and the overflow notch 7 and the exhaust notch 8 are staggered. The overflow notch 7 is located in the middle of one side of the overflow groove 6. The overflow groove 6 is connected to the molding cavity 3 through the overflow notch 7. The exhaust notch 8 is located at the end of one end of the overflow groove 6. The overflow groove 6 has a structure with a small bottom and a large opening. The groove wall of the overflow groove 6 is arranged obliquely outward from bottom to top. The depth of the exhaust notch 8 is less than the depth of the overflow notch 7, and the depth of the overflow notch 7 is much less than the depth of the overflow groove 6. In this embodiment, the overflow groove 6 is in an arc shape. In actual production, the overflow groove 6 can be in a long strip shape. There is a pouring port 9 in the mold, and the pouring port 9 is connected to the molding cavity 3. The overflow notch 7 is far away from the pouring port 9 and the overflow notch 7 and the pouring port 9 are arranged relative to each other.

[0029] The exhaust ring groove 4 is located above the exhaust recess 8, and the exhaust ring groove 4 is located above the exhaust groove 10. The exhaust recess 8 and the exhaust groove 10 are both long strips. The depth of the exhaust groove 10 is the same as the depth of the exhaust recess 8. In this embodiment, the depth of the exhaust groove 10 and the exhaust recess 8 are both 0.3mm. In actual production, the depth of the exhaust groove 10 and the exhaust recess 8 can be 0.2mm or 0.4mm.

[0030] When the upper mold 1 and the lower mold 2 are closed, the exhaust recess 8 is connected with the exhaust ring groove 4, all the exhaust grooves 10 are connected with the exhaust ring groove 4, the exhaust recess 8 and the exhaust groove 10 are cross-arranged with the exhaust ring groove 4, the length of the exhaust recess 8 and the exhaust groove 10 are greater than the width of the exhaust ring groove 4, and the exhaust groove 10 is connected with the molding cavity 3 through the gap between the upper mold 1 and the lower mold 2.

[0031] A sealing ring 11 is provided between the lower mold 2 and the lower mold 2, and the sealing ring 11 includes a protruding clamping portion 111. In this embodiment, the top surface of the lower mold 2 is provided with a concave and annular annular clamping groove 12, and the clamping portion 111 is embedded and clamped in the annular clamping groove 12. When the upper mold 1 and the lower mold 2 are closed, the exhaust ring groove 4, the overflow groove 6, the overflow recess 7, the exhaust recess 8 and the exhaust groove 10 are all located in the space surrounded by the annular clamping groove 12. In actual production, the annular clamping groove 12 can be located on the bottom surface of the upper mold 1.

[0032] During operation, the upper mold 1 and the lower mold 2 are closed, and the raw material is injected into the molding cavity 3 through the pouring port 9. In this process, the vacuum pump evacuates the exhaust channel 5, so that the gas in the molding cavity 3 is discharged through the overflow notch 7, the overflow groove 6, the exhaust notch 8, the exhaust ring groove 4 and the exhaust channel 5, and the other way is discharged through the gap between the upper mold 1 and the lower mold 2, the exhaust groove 10, the exhaust ring groove 4 and the exhaust channel 5. When the raw material fills the molding cavity 3, the excess raw material enters the overflow groove 6 through the overflow notch 7 and is stored. When the mold is opened and the material is discharged, the external gas enters the exhaust ring groove 4, the exhaust groove 10, the exhaust notch 8 and the gap between the upper mold 1 and the lower mold 2 through the exhaust channel 5, thereby increasing the pressure between the upper mold 1 and the lower mold 2, making the pressure difference inside and outside the mold basically the same, so that the mold opening is labor-saving.

[0033] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0034] Although the terms such as upper mold 1, lower mold 2, molding cavity 3, exhaust ring groove 4, exhaust channel 5, overflow groove 6, overflow notch 7, exhaust notch 8, pouring port 9, exhaust groove 10, sealing ring 11, clamping part 111, annular clamping groove 12 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A mold overflow venting structure, the mold comprising an upper mold (1) and a lower mold (2), a molding cavity (3) being provided between the upper mold (1) and the lower mold (2), characterized in that: The overflow exhaust structure comprises an exhaust ring groove (4) which is recessed upward on the bottom surface of the upper mold (1), an exhaust channel (5) located in the upper mold (1), and an overflow groove (6), an overflow recess (7) and an exhaust recess (8) which are all arranged on the top surface of the lower mold (2) and recessed downward, wherein the exhaust ring groove (4) is annular and surrounds the molding cavity (3), the overflow recess (7) and the exhaust recess (8) are respectively located on both sides of the overflow groove (6), and the overflow recess (7) and the exhaust recess (8) are staggered. The overflow groove (6) is openly arranged, the overflow groove (6) has a structure with a small bottom and a large opening, the groove wall of the overflow groove (6) is arranged obliquely from bottom to top and outward, the overflow groove (6) is connected to the molding cavity (3) through the overflow recess (7), the exhaust ring groove (4) is located above the exhaust recess (8), when the upper mold (1) and the lower mold (2) are closed, the exhaust recess (8) is connected to the exhaust ring groove (4), the bottom of the exhaust channel (5) is connected to the exhaust ring groove (4), and the top passes through the upper mold (1).

2. A mold overflow venting structure according to claim 1, characterized in that: The overflow groove (6) is in the shape of a long strip or an arc, the overflow notch (7) is located in the middle of one side of the overflow groove (6), and the exhaust notch (8) is located at the end of one end of the overflow groove (6).

3. A mold overflow venting structure according to claim 1, characterized in that: The depth of the exhaust recess (8) is smaller than the depth of the overflow recess (7), and the depth of the overflow recess (7) is much smaller than the depth of the overflow groove (6).

4. A mold overflow venting structure according to claim 1, 2 or 3, characterized in that: The mold has a pouring port (9), the pouring port (9) is connected to the molding cavity (3), the overflow recess (7) is far away from the pouring port (9), and the overflow recess (7) and the pouring port (9) are arranged opposite to each other.

5. A mold overflow venting structure according to claim 1, 2 or 3, characterized in that: The exhaust channel (5) is arranged in a vertical direction, and the exhaust channel (5) passes through the top of the upper mold (1), or the top of the exhaust channel (5) turns and then passes through the side of the upper mold (1).

6. A mold flash exhaust structure according to claim 1, 2 or 3, characterized in that: The top surface of the lower mold (2) has a plurality of exhaust grooves (10) that are recessed downwards, all of the exhaust grooves (10) are arranged in a ring shape around the molding cavity (3), and two adjacent exhaust grooves (10) are arranged at intervals, the exhaust ring groove (4) is in a ring shape and is located above the exhaust groove (10), and when the upper mold (1) and the lower mold (2) are closed, all of the exhaust grooves (10) are connected to the exhaust ring groove (4), and the exhaust grooves (10) are connected to the molding cavity (3) through the gap between the upper mold (1) and the lower mold (2).

7. A mold overflow venting structure according to claim 6, characterized in that: The exhaust recess (8) and the exhaust groove (10) are both in the shape of long strips, and are arranged crosswise with the exhaust ring groove (4). The lengths of the exhaust recess (8) and the exhaust groove (10) are both greater than the width of the exhaust ring groove (4).

8. A mold overflow venting structure according to claim 6, characterized in that: The depth of the exhaust groove (10) is the same as the depth of the exhaust notch (8), and the depths of the exhaust groove (10) and the exhaust notch (8) are both between 0.2 and 0.4 mm.

9. A mold overflow venting structure according to claim 6, characterized in that: A sealing ring (11) is provided between the lower mold (2) and the upper mold (2), the sealing ring (11) comprising a protruding clamping portion (111), a concavely arranged annular clamping groove (12) in the shape of an annulus is provided on the top surface of the lower mold (2) or the bottom surface of the upper mold (1), the clamping portion (111) is embedded and clamped in the annular clamping groove (12), and when the upper mold (1) and the lower mold (2) are closed, the exhaust ring groove (4), the overflow groove (6), the overflow recess (7), the exhaust recess (8) and the exhaust groove (10) are all located in the space surrounded by the annular clamping groove (12).

Images