Gas discharge structure inside a thermosetting mold cavity

Abstract

The utility model relates to thermosetting mould cavity technical field discloses a kind of thermosetting mould cavity internal gas exhaust structure, including upper fixed mould insert and lower fixed mould insert, the upper fixed mould insert bottom is arranged in the lower fixed mould insert top, the inner cavity is provided in the upper fixed mould insert, the contact surface between the upper fixed mould insert and the lower fixed mould insert is the bottom surface of cavity inside, the contact surface of the upper fixed mould insert is equipped with exhaust groove, inner cavity is product shape part, lower fixed mould insert is plane, the upper fixed mould insert is equipped with dismounting assembly inside.The utility model is constructed, thermosetting mould gas exhaust, fixed mould module is divided into upper fixed mould insert and lower fixed mould insert, contact surface is cavity bottom surface, in the edge of upper fixed mould insert shape part, 3 no pouring direction are equipped with exhaust groove, gas is discharged through it, solve the problem that product burns due to difficult exhaust of cavity internal gas, improve production yield and economy.

Description

Technical Field

[0001] This utility model relates to the field of thermosetting mold cavity technology, and in particular to a gas exhaust structure inside a thermosetting mold cavity. Background Technology

[0002] In the field of injection mold manufacturing, thermosetting molds are widely used to mold thermosetting plastic raw materials into various products through specific processes. The gas venting structure inside the thermosetting mold cavity is a crucial part of ensuring product quality. During the injection molding process of thermosetting plastics, a certain amount of gas is generated due to heating and chemical reactions of the raw materials. If this gas cannot be vented in a timely and effective manner, it will accumulate inside the cavity, interfering with plastic molding and affecting the product's appearance and performance. Therefore, a reasonable gas venting structure is essential for thermosetting molds, affecting product yield and production economy.

[0003] In existing thermosetting mold technology systems, the common approach to venting flammable gases from the mold cavity is to create venting grooves in specific areas of the mold surface. Specifically, during mold design and manufacturing, based on experience and simulation analysis, the surface location where flammable gases accumulate is determined. Then, venting grooves of a certain width, depth, and length are created on the corresponding cavity surface through milling, grinding, or other machining methods. Utilizing the gas's own fluidity and the pressure difference during injection molding, the flammable gases are vented out of the cavity along the venting grooves, thus attempting to solve the problem of flammable gas accumulation and ensure a relatively stable injection molding process.

[0004] However, existing technologies have significant drawbacks. When gas is generated inside the cavity of a thermosetting mold, relying solely on surface venting channels is insufficient to effectively address the accumulation of gas within the cavity (in non-surface areas). Due to the complex internal structure of thermosetting plastic injection mold cavities and the diverse diffusion paths of generated gas, surface venting channels cannot cover all gas accumulation points, leading to continuous gas accumulation within the cavity. During injection molding, this accumulated gas causes burn marks on the product surface, severely affecting its appearance. As a cosmetic product, these burn marks result in rejection due to defects, significantly increasing production costs, reducing yield and economic efficiency, and failing to meet the demands for efficient and high-quality production. Therefore, this paper proposes a gas venting structure for the inside of a thermosetting mold cavity to address these issues. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a gas exhaust structure inside the cavity of a thermosetting mold, which aims to improve the problem of product burns caused by the difficulty in exhausting gas inside the cavity in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A gas venting structure for the cavity of a thermosetting mold includes an upper fixed mold insert and a lower fixed mold insert. The bottom of the upper fixed mold insert is disposed on the top of the lower fixed mold insert. The upper fixed mold insert has an inner cavity. The contact surface between the upper fixed mold insert and the lower fixed mold insert is the bottom surface of the cavity. The contact surface of the upper fixed mold insert has a venting groove. The inner cavity is the product ejection part. The lower fixed mold insert is a plane. The upper fixed mold insert has a disassembly assembly inside.

[0008] As a further description of the above technical solution:

[0009] The assembly / disassembly component includes a retaining plate, the outer wall of which is slidably connected to the interior of the upper fixed mold insert, and the interior of the upper fixed mold insert has a moving groove.

[0010] As a further description of the above technical solution:

[0011] The outer wall of the card plate is slidably connected to the inside of the inner cavity, and a guide groove is provided inside the card plate.

[0012] As a further description of the above technical solution:

[0013] The upper mold insert has a sliding column inside, and a push rod is fixedly connected to one end of the sliding column.

[0014] As a further description of the above technical solution:

[0015] The outer wall of the push rod is slidably connected inside the guide groove, and a limiting ring is fixedly connected to the other end of the slide column.

[0016] As a further description of the above technical solution:

[0017] The outer wall of the limiting ring is slidably connected inside the upper fixed mold insert to limit the position of the push rod.

[0018] As a further description of the above technical solution:

[0019] A tension spring is provided inside the upper fixed mold insert. One end of the tension spring is fixedly connected to the inner wall of the upper fixed mold insert, and the other end of the tension spring is fixedly connected to the outer wall of the limiting ring.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, a gas exhaust structure for thermosetting molds is constructed. The fixed mold module consists of upper and lower fixed mold inserts with the contact surface being the bottom surface of the cavity. On the edge of the upper fixed mold insert at the forming part, there are three exhaust grooves in the direction without gates, through which the gas is discharged. This solves the problem of product burn caused by the difficulty in venting gas inside the cavity, and improves the production yield and economy.

[0022] 2. In this utility model, based on the gas exhaust structure of the thermosetting mold cavity, a push rod and a clamping plate are added in conjunction with a tension spring. By driving the clamping plate to slide inside the upper fixed mold insert, the internal cavity of the upper fixed mold insert can be easily disassembled and assembled. With the help of the spring elastic force, the relevant components can be quickly lifted and reset, simplifying the maintenance process, solving the traditional problem of cumbersome disassembly and assembly of the upper fixed mold insert cavity, and improving the convenience of mold maintenance and repair efficiency. Attached Figure Description

[0023] Figure 1 This is a three-dimensional schematic diagram of a gas exhaust structure inside the cavity of a thermosetting mold proposed in this utility model.

[0024] Figure 2 This is a schematic diagram of the upper mold insert, which is a gas discharge structure inside the cavity of a thermosetting mold proposed in this utility model.

[0025] Figure 3 This is a schematic diagram of the lower mold insert, which is a gas exhaust structure for the cavity of a thermosetting mold proposed in this utility model.

[0026] Figure 4 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 5 This is a schematic diagram of the sliding column of the gas discharge structure inside the cavity of a thermosetting mold proposed in this utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the card plate for the gas discharge structure inside the cavity of a thermosetting mold proposed in this utility model.

[0029] Legend:

[0030] 1. Upper fixed mold insert; 2. Inner cavity; 3. Lower fixed mold insert; 4. Venting groove; 5. Clamping plate; 6. Moving groove; 7. Push rod; 8. Tension spring; 9. Restricting ring; 10. Sliding column; 11. Guide groove. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figures 1-6This utility model provides an embodiment of a gas exhaust structure inside a thermosetting mold cavity, including an upper fixed mold insert 1 and a lower fixed mold insert 3. The bottom of the upper fixed mold insert 1 is set at the top of the lower fixed mold insert 3, and the two together enclose the main space of the mold cavity. The upper fixed mold insert 1 has an inner cavity 2, which is a key area for product molding. Its outline is adapted to the product extrusion and can accurately shape the product shape. The contact surface between the upper fixed mold insert 1 and the lower fixed mold insert 3 is the bottom surface inside the cavity. The contact surface of the upper fixed mold insert 1 is provided with an exhaust groove 4. The exhaust groove 4 is machined by milling. The width, depth and other parameters have been verified by simulation and practice. It can guide the gas generated during the injection of thermosetting plastic, and with the help of the injection pressure difference, it flows to the low pressure area and is discharged from the cavity, avoiding the accumulation of gas and causing product burns, and ensuring the product molding quality. The inner cavity 2 is the product extrusion part. The lower fixed mold insert 3 is a plane. The upper fixed mold insert 1 has a disassembly assembly inside.

[0033] The assembly and disassembly components include a clamping plate 5, made of high-strength alloy steel, which possesses excellent wear resistance and structural strength—common knowledge, so it will not be elaborated further here. Its outer wall is connected to a sliding groove 6 inside the upper fixed mold insert 1 via a sliding fit structure, allowing it to slide linearly along the groove 6. Simultaneously, the outer wall of the clamping plate 5 extends into the inner cavity 2, normally providing a limiting and fixing function for the relevant molding components within the inner cavity 2. A guide groove 11 is provided inside the clamping plate 5 to guide the movement of the push rod 7. The outer wall of the clamping plate 5 is slidably connected to the inner cavity 2, and the upper fixed mold insert 1 has a sliding groove 6 inside. A sliding column 10 is slidably connected inside the upper fixed mold insert 1, with one end of the sliding column 10 fixedly connected to the push rod 7. The sliding column 10 is made of stainless steel, possessing corrosion resistance and high strength characteristics—common knowledge, and is made of stainless steel. As is common knowledge, one end of the push rod 7 is fixedly connected by welding. The outer wall of the push rod 7 slides in conjunction with the inner wall of the guide groove 11. When the push rod 7 is pushed, the clamping plate 5 can slide in the moving groove 6. The outer wall of the push rod 7 is slidably connected to the inside of the guide groove 11. The other end of the slide column 10 is fixedly connected to a limiting ring 9. The outer wall of the limiting ring 9 is slidably connected to the inside of the upper fixed mold insert 1, which is used to limit the push rod 7. A tension spring 8 is provided inside the upper fixed mold insert 1. One end of the tension spring 8 is fixedly connected to the inner wall of the upper fixed mold insert 1, and the other end of the tension spring 8 is fixedly connected to the outer wall of the limiting ring 9.

[0034] Working Principle: After the injection molding process begins, thermosetting plastic is injected into the mold cavity, where it undergoes a chemical reaction under heating conditions, generating combustible gas. Since the contact surfaces of the upper mold insert 1 and the lower mold insert 3 form the bottom surface of the mold cavity, and the contact surface of the upper mold insert 1 is specifically designed with venting grooves 4, the combustible gas will spontaneously move towards the low-pressure area based on gas flow characteristics. The venting grooves 4 then become the channels for this gas flow. Simultaneously, a pressure difference exists during injection molding. With the assistance of this pressure difference, the combustible gas gradually escapes from the inside of the mold cavity into the external environment along the venting grooves 4. This process effectively prevents the combustible gas from accumulating inside the mold cavity, thus preventing burns caused by gas accumulation and strongly ensuring the molding quality of the product, resulting in more stable appearance and performance of the manufactured products.

[0035] When the internal cavity 2 of the upper fixed mold insert 1 needs to be inspected, the operator pushes the push rod 7. The push rod 7 moves along the guide groove 11, which in turn drives the clamping plate 5 to slide in the moving groove 6. During this process, the tension spring 8 is stretched and deformed. As the clamping plate 5 slides, it gradually breaks free from the limiting constraint on the internal cavity 2. At this time, the operator can easily remove the parts in the internal cavity 2 to carry out cleaning, maintenance or replacement operations. After the inspection is completed, the push rod 7 is released, and the tension spring 8 returns to its original shape due to its elasticity. By limiting the force generated by the ring 9, it drives the sliding column 10 and the push rod 7 back to their initial positions in sequence. The clamping plate 5 is also re-clamped into the internal cavity 2, completing the entire assembly process. This realizes the quick and convenient disassembly and maintenance of the internal structure of the upper fixed mold insert 1, improving the maintenance efficiency and practicality of the mold.

Claims

1. A gas venting structure inside a thermosetting mold cavity, comprising an upper fixed mold insert (1) and a lower fixed mold insert (3), characterized in that: The bottom of the upper fixed mold insert (1) is located on the top of the lower fixed mold insert (3). The upper fixed mold insert (1) has an inner cavity (2). The contact surface between the upper fixed mold insert (1) and the lower fixed mold insert (3) is the bottom surface inside the cavity. The contact surface of the upper fixed mold insert (1) is provided with an exhaust groove (4). The inner cavity (2) is the product ejection part. The lower fixed mold insert (3) is a plane. The upper fixed mold insert (1) has a disassembly assembly inside.

2. The gas discharge structure inside the cavity of a thermosetting mold according to claim 1, characterized in that: The assembly and disassembly assembly includes a retaining plate (5), the outer wall of which is slidably connected to the interior of the upper fixed mold insert (1), and the interior of the upper fixed mold insert (1) is provided with a moving groove (6).

3. The gas discharge structure inside the cavity of a thermosetting mold according to claim 2, characterized in that: The outer wall of the card plate (5) is slidably connected to the inside of the inner cavity (2), and a guide groove (11) is provided inside the card plate (5).

4. The gas exhaust structure inside the cavity of a thermosetting mold according to claim 3, characterized in that: The upper mold insert (1) has a sliding column (10) inside, and a push rod (7) is fixedly connected to one end of the sliding column (10).

5. The gas discharge structure inside the cavity of a thermosetting mold according to claim 4, characterized in that: The outer wall of the push rod (7) is slidably connected to the inside of the guide groove (11), and the other end of the slide column (10) is fixedly connected to a limiting ring (9).

6. The gas discharge structure inside the cavity of a thermosetting mold according to claim 5, characterized in that: The outer wall of the limiting ring (9) is slidably connected inside the upper fixed mold insert (1) to limit the push rod (7).

7. The gas discharge structure inside the cavity of a thermosetting mold according to claim 6, characterized in that: The upper fixed mold insert (1) is provided with a tension spring (8), one end of the tension spring (8) is fixedly connected to the inner wall of the upper fixed mold insert (1), and the other end of the tension spring (8) is fixedly connected to the outer wall of the limiting ring (9).

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