Foaming mold

Abstract

The utility model relates to the technical field of foaming process, and provides a foaming mold which is used for forming polyurethane foam, a through hole is formed in the polyurethane foam, and the foaming mold comprises a fixed mold assembly, a fixed mold assembly and a movable mold assembly, the movable mold assembly movably abuts against the fixed mold assembly, a product cavity is formed by the movable mold assembly and the fixed mold assembly, and a second forming column is arranged on the movable mold assembly; one end of the first forming column abuts against one end of the second forming column and is used for forming a through hole; the abutting ends of the first forming column and / or the second forming column are provided with the hollowed-out parts, in the process of injecting a foaming agent and a base material, a mixture can flow into the hollowed-out parts, after forming, the mixture in the hollowed-out parts is separated from a product, and in the process of injecting the foaming agent and the base material next time, the mixture in the hollowed-out parts is left to play a role in soft sealing. Therefore, no flash is formed on the through hole after the product is formed, and an additional flash removing process does not need to be added, so that the production cost is reduced, and the working efficiency is improved at the same time.

Description

Technical Field

[0001] The utility model relates to the field of foaming technology, in particular to a foaming mold. Background Art

[0002] Foaming molds are specifically designed for producing foam plastic products. These molds are primarily used to convert liquid or solid raw materials through chemical reactions or physical methods into foam materials with lightweight, thermally insulating, and soundproof properties. Foaming molds are widely used in the automotive, packaging, construction, and other industries requiring lightweight materials.

[0003] The foaming mold is mainly composed of a fixed mold assembly and a movable mold assembly. When producing polyurethane foam products with through holes, forming columns are usually set on the fixed mold assembly and the movable mold assembly respectively. When the fixed mold assembly and the movable mold assembly are pressed against each other to form the product cavity, the ends of the forming columns on the fixed mold assembly and the movable mold assembly will press against each other to ensure that the required through holes are formed during the molding process. However, in the prior art, when the two forming columns are pressed against each other, during the process of injecting the foaming agent and the base material, the mixture will flow into the area where the forming columns are pressed against each other, resulting in the formation of flash on the through holes after molding. The existence of flash not only affects the appearance quality of the product, but also causes great interference to the performance of the finished polyurethane foam. Therefore, after the foaming mold completes the molding of the product, an additional process of cleaning the flash is required, which undoubtedly increases the production cost and reduces work efficiency. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a foaming mold in view of the current status of the existing technology.

[0005] The technical solution adopted by the present invention to solve the above technical problems is: to provide a foaming mold for forming polyurethane foam, wherein the polyurethane foam is provided with through holes, and the foaming mold comprises:

[0006] Fixed mold assembly;

[0007] A movable mold assembly, which movably abuts against the fixed mold assembly and together forms a product cavity;

[0008] The fixed mold assembly is provided with a first molding column, and the movable mold assembly is provided with a second molding column. One end of the first molding column and the second molding column can be tightly pressed together due to the movable abutment between the movable mold assembly and the fixed mold assembly, so as to form the through hole;

[0009] One end of the first forming column and / or the second forming column that abuts against each other has a hollow portion, and the hollow portion is used to reduce the abutment area between the first forming column and the second forming column.

[0010] In the above-mentioned foaming mold, the cross section of the hollow portion is trapezoidal.

[0011] In the above-mentioned foaming mold, the angle between the bottom of the hollow portion and the side wall is 100°±10°.

[0012] In the above-mentioned foaming mold, the thickness of the side wall of the hollow portion is 2 mm ± 0.2 mm.

[0013] In the above-mentioned foaming mold, the movable mold assembly is further provided with an exhaust assembly, which is communicated with the product cavity and is used to exhaust the gas in the product cavity.

[0014] In the above-mentioned foaming mold, the exhaust component includes:

[0015] A driving member, which is arranged on the movable mold assembly;

[0016] an exhaust needle, one end of which is connected to the output end of the driving member;

[0017] The connecting piece has a through hole thereon, and the exhaust needle, one end away from the driving piece, passes through the through hole and is movably inserted into the movable mold assembly, forming an exhaust channel between the connecting piece and the exhaust needle.

[0018] In the above-mentioned foaming mold, a first cooling pipe is further provided on the fixed mold assembly, and a coolant flows in the first cooling pipe to cool the fixed mold assembly.

[0019] In the above-mentioned foaming mold, a second cooling pipe is provided on the movable mold assembly, and a coolant flows in the second cooling pipe to cool the movable mold assembly.

[0020] Compared with the prior art, the advantage of the present invention is that by providing a hollow portion on the first molding column and / or the second molding column, the contact area between the first molding column and the second molding column is significantly reduced. During the process of injecting the foaming agent and the base material, the mixture will flow into the hollow portion. As the mixture gradually hardens and forms in the product cavity, the fixed mold assembly and the movable mold assembly are separated. At this time, the mixture in the hollow portion will remain in the hollow portion and separate from the molded product. The mixture residue on the contact surface between the first molding column and the second molding column will adhere to the mixture in the hollow portion, so that no flash will be formed on the through hole; in addition, during the next injection of the foaming agent and the base material, the mixture residue in the hollow portion acts as a soft seal for the contact between the first molding column and the second molding column, and no more foaming agent and base material mixture will flow into the contact between the first molding column and the second molding column, so that no flash will be formed on the molded through hole. The through hole on the polyurethane foam molded in this way will not have flash, so there is no need to add an additional deburring process after the product is molded, which not only reduces production costs but also improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of this scheme;

[0022] Figure 2 It is a three-dimensional diagram of the fixed mold assembly in this scheme;

[0023] Figure 3 yes Figure 2 A stereogram in another direction;

[0024] Figure 4 It is the three-dimensional solid of the moving mold component in this solution;

[0025] Figure 5 yes Figure 4 Floor plan in;

[0026] Figure 6 yes Figure 5 Cross-sectional view of AA in the figure.

[0027] In the figure, 1. fixed mold assembly; 2. movable mold assembly; 3. first molding column; 4. second molding column; 5. hollow portion; 6. bottom; 7. side wall; 8. exhaust assembly; 9. driving member; 10. exhaust needle; 11. connecting member; 12. first cooling pipe; 13. second cooling pipe. DETAILED DESCRIPTION

[0028] 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.

[0029] like Figures 1 to 6As shown, a foaming mold of the utility model is used to form polyurethane foam, and a through hole is provided on the polyurethane foam. The foaming mold includes: a fixed mold component 1; a movable mold component 2, which is movably abutted against the fixed mold component 1 and jointly forms a product cavity; a first molding column 3 is provided on the movable mold component 2, and a second molding column 4 is provided on the fixed mold component 1. One end of the first molding column 3 and the second molding column 4 can be pressed against each other due to the movable abutment between the movable mold component 2 and the fixed mold component 1, so as to form a through hole; the end at which the first molding column 3 and / or the second molding column 4 are pressed against each other has a hollow portion 5, and the hollow portion 5 is used to reduce the abutment area between the first molding column 3 and the second molding column 4.

[0030] During operation, the fixed mold assembly 1 and the movable mold assembly 2 abut against and form a product cavity, and one end of the first molding column 3 and the second molding column 4 abut against each other to form a through hole; when a hollow portion 5 is provided on the first molding column 3 or the second molding column 4, one end of the first molding column 3 can be abutted against the end of the side wall 7 of the hollow portion 5, or one end of the second molding column 4 can be abutted against the end of the side wall 7 of the hollow portion 5. When both the first molding column 3 and the second molding column 4 have hollow portions 5, when the first molding column 3 and the second molding column 4 abut against each other, only the ends of the side walls 7 between the two hollow portions 5 abut against each other, so that no matter whether the first molding column 3 has a hollow portion 5, or the second molding column 4 has a hollow portion 5, or both have a hollow portion 5, the contact area between the first molding column 3 and the second molding column 4 is only the area of ​​the end of the side wall 7 of the hollow portion 5, which significantly reduces the contact area between the two.

[0031] During the process of injecting the foaming agent and the base material, the mixture will flow into the hollow part 5. As the mixture gradually hardens and forms in the product cavity, the fixed mold assembly 1 and the movable mold assembly 2 are separated. At this time, the mixture in the hollow part 5 will remain in the hollow part 5 and separate from the molded product. The residual mixture in the contact surface between the first molding column 3 and the second molding column 4 will adhere to the mixture in the hollow part 5, so no burrs will be formed on the through hole.

[0032] In addition, during the next injection of the foaming agent and the base material, the mixture remaining in the hollow portion 5 acts as a soft seal between the first molding column 3 and the second molding column 4, and no more mixture of the foaming agent and the base material will flow into the abutment between the first molding column 3 and the second molding column 4, so that no burrs will be formed on the molded through-holes. The through-holes on the polyurethane foam molded in this way will not have burrs, so there is no need to add an additional deburring process after the product is molded, which not only reduces production costs, but also improves work efficiency.

[0033] In order to facilitate the processing of the hollow portion 5 , the cross section of the hollow portion 5 is trapezoidal.

[0034] Furthermore, the angle between the bottom 6 of the hollow portion 5 and the side wall 7 is 100°±10°. Such an angle is easy to process, and the mixture remaining in the hollow portion 5 is more likely to adhere to the hollow portion 5 when the fixed mold assembly 1 and the movable mold assembly 2 are separated, thereby reducing the formation of flash.

[0035] Furthermore, the thickness of the side wall 7 of the hollow portion 5 is 2 mm ± 0.2 mm. When the first molding column 3 or the second molding column 4 is provided with a hollow portion 5, the abutment surface between the first molding column 3 and the second molding column 4 is only between one end of the first molding column 3 or the second molding column 4 and the end surface of the side wall 7 of the hollow portion 5. When both the first molding column 3 and the second molding column 4 are provided with a hollow portion 5, the abutment surface between the first molding column 3 and the second molding column 4 is also only the end surface of the side wall 7 of the two hollow portions 5. No matter how much the diameter of the through-hole of the finished polyurethane foam is, The area of ​​contact between the first molding column 3 and the second molding column 4 is always determined by the thickness of the side wall 7 of the hollow part 5; the smaller the thickness of the side wall 7 of the hollow part 5, the smaller the area of ​​contact between the first molding column 3 and the second molding column 4. When the fixed mold assembly 1 and the movable mold assembly 2 are separated, the mixture residue in the contact surface between the first molding column 3 and the second molding column 4 is more likely to adhere to the mixture in the hollow part 5. This is because the smaller thickness of the side wall 7 makes it easier for the mixture in the contact surface to combine with the mixture in the hollow part 5, thereby reducing the formation of flash.

[0036] Specifically, the movable mold assembly 2 is further provided with an exhaust assembly 8, which is connected to the product cavity and is used to exhaust the gas in the product cavity.

[0037] Furthermore, the exhaust assembly 8 includes: a driving member 9, which is arranged on the movable mold assembly 2; an exhaust needle 10, one end of which is connected to the output end of the driving member 9; a connecting member 11, which has a through-hole, and the exhaust needle 10 is movably inserted into the movable mold assembly 2 through the through-hole at one end away from the driving member 9, and an exhaust channel is formed between the connecting member 11 and the exhaust needle 10; in the process of injecting the foaming agent and the base material into the foaming mold in this scheme, the air in the cavity and the large amount of gas generated during the foaming process will be discharged along the exhaust channel between the exhaust needle 10 and the connecting member 11. As the mixture gradually hardens and forms in the product cavity, the fixed mold assembly 1 and the movable mold assembly 2 are separated, and the driving member 9 drives the exhaust needle 10 to move relative to the movable mold assembly 2, so that the residue of the hardened mixture in the exhaust channel leaves the movable mold assembly 2. The driving member 9 is preferably a cylinder.

[0038] In order to cool the fixed mold assembly 1, a first cooling pipe 12 is further provided on the fixed mold assembly 1. By providing the first cooling pipe 12 on the fixed mold assembly 1, the temperature of the fixed mold assembly 1 can be effectively controlled. The coolant flows in the first cooling pipe 12 to take away heat, ensuring that the fixed mold assembly 1 remains within the optimal temperature range during the molding process.

[0039] In order to cool the movable mold assembly 2, a second cooling pipe 13 is provided on the movable mold assembly 2. By providing the second cooling pipe 13 on the movable mold assembly 2, the temperature of the movable mold assembly 2 can be effectively controlled. The coolant flows in the second cooling pipe 13 to take away the heat, ensuring that the movable mold assembly 2 remains in the optimal temperature range during the molding process.

[0040] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0042] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0043] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0044] 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 with similar methods, without departing from the scope defined by the spirit of the present invention.

Claims

1. A foaming mold for forming polyurethane foam, wherein the polyurethane foam is provided with through holes, characterized in that: The foaming mold comprises: Fixed mold assembly; A movable mold assembly, which movably abuts against the fixed mold assembly and together forms a product cavity; The fixed mold assembly is provided with a first molding column, and the movable mold assembly is provided with a second molding column. One end of the first molding column and the second molding column can be tightly pressed together due to the movable abutment between the movable mold assembly and the fixed mold assembly, so as to form the through hole; One end of the first forming column and / or the second forming column that abuts against each other has a hollow portion, and the hollow portion is used to reduce the abutment area between the first forming column and the second forming column.

2. A foaming mold according to claim 1, characterized in that: The cross section of the hollow portion is trapezoidal.

3. A foaming mold as claimed in claim 2, characterized in that: The included angle between the bottom of the hollow portion and the side wall is 100°±10°.

4. A foaming mold as claimed in claim 3, characterized in that: The thickness of the side wall of the hollow portion is 2 mm ± 0.2 mm.

5. A foaming mold according to claim 1, characterized in that: The movable mold assembly is also provided with an exhaust assembly, which is communicated with the product cavity and is used to exhaust the gas in the product cavity.

6. A foaming mold according to claim 5, characterized in that: The exhaust assembly comprises: A driving member, which is arranged on the movable mold assembly; an exhaust needle, one end of which is connected to the output end of the driving member; The connecting piece has a through hole thereon, and the exhaust needle, one end away from the driving piece, passes through the through hole and is movably inserted into the movable mold assembly, forming an exhaust channel between the connecting piece and the exhaust needle.

7. A foaming mold according to claim 1, characterized in that: The fixed mold assembly is also provided with a first cooling pipe, in which coolant flows to cool the fixed mold assembly.

8. A foaming mold according to claim 1, characterized in that: The movable mold assembly is provided with a second cooling pipe, and a coolant flows in the second cooling pipe to cool the movable mold assembly.

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