Exhaust structure and gravity casting mold

Abstract

The present application relates to exhaust structure and gravity casting mold, including runner plate, the runner plate has a contact surface and a non-contact surface, the runner plate non-contact surface is provided with a sprue, the runner plate contact surface is provided with multiple groups of liquid inlet holes which are communicated with the sprue, the runner plate contact surface and is located around each group of liquid inlet holes and is integrally formed with the boss one, the boss one is provided with multiple groups of fixing blocks, the present application is through setting fixing block on the contact surface of runner plate and cavity contact, not only increase the exhaust gap between both, but also can prevent the metal liquid outflow and cause the problem of cape, the gas in the cavity is discharged to the direction of liquid inlet hole through exhaust passage, effectively increase the speed of gas discharge after the metal liquid enters the cavity, make the gas can be completely discharged from the cavity before the metal liquid solidification, can effectively solve the product surface thin skin pore problem caused by poor exhaust during production process.

Description

Technical Field

[0001] This invention relates to the field of mold technology, and more particularly to venting structures and gravity casting molds. Background Technology

[0002] Gravity casting molds have advantages such as simple structure, low cost, and convenient maintenance, and are widely used in the metal forming industry. Under the action of gravity, molten metal enters the cavity through the gate. During this process, the molten metal will carry some gas and fill the cavity together. Ideally, after the molten metal fills the cavity, the air in the cavity is completely squeezed out and the gas it carried in is discharged before solidification. However, due to factors such as poor venting of the mold itself and excessively rapid liquid condensation, there may be a situation where the gas can be completely discharged before the molten metal begins to solidify, resulting in pores on the product surface, which in turn affects the product performance and causes product defects. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing an exhaust structure and a gravity casting mold, the specific technical solutions of which are as follows:

[0004] The exhaust structure includes a runner plate, which has a contact surface and a non-contact surface. A gate is provided on the non-contact surface of the runner plate, and multiple sets of liquid inlet holes communicating with the gate are provided on the contact surface of the runner plate. A boss is integrally formed on the contact surface of the runner plate and around each set of liquid inlet holes. Multiple sets of fixing blocks are provided on the boss. The gap between any two sets of adjacent fixing blocks is connected to form an exhaust channel. The exhaust channel guides the gas on the contact surface to be discharged from the exhaust channel towards the liquid inlet holes.

[0005] In the above technical solution, molten metal is poured in from the gate and then distributed to each cavity through the inlet hole. The boss's function is to cooperate with the cavity to form a relatively closed space for the molten metal to form. The fixing block is set on the contact surface between the runner plate and the cavity, which not only increases the venting gap between the two, but also prevents the molten metal from flowing out and causing burrs. The gas in the cavity is discharged towards the inlet hole through the venting channel, which effectively increases the gas discharge speed after the molten metal enters the cavity, so that the gas can be completely discharged from the cavity before the molten metal solidifies. This can effectively solve the problem of thin skin and porosity on the product surface caused by poor venting during the production process.

[0006] As an improvement to the above technical solution, the contact surface of the flow channel plate is integrally formed with two bosses at the four corners.

[0007] As an improvement to the above technical solution, the height of the second boss is greater than the sum of the height of the first boss and the height of the fixing block.

[0008] As an improvement to the above technical solution, the height of the fixing block is between 0.05 and 0.15 mm, and the gap between any two sets of adjacent fixing blocks is less than 1 mm.

[0009] As an improvement to the above technical solution, the height of the first boss is less than 1 mm.

[0010] Gravity casting mold, including:

[0011] Fixed mold;

[0012] Moving model;

[0013] The venting structure described above includes a flow channel plate with its contact surface fixedly mounted to the top of the fixed mold, a bottom plate at the bottom of the fixed mold, and a moving mold slidably disposed between the bottom plate and the contact surface of the flow channel plate.

[0014] In the above technical solution, the gravity casting mold with a venting structure can enhance gas discharge without affecting product molding.

[0015] The beneficial effects of this invention are:

[0016] By placing the fixing block on the contact surface between the flow channel plate and the cavity, not only is the exhaust gap between the two increased, but the outflow of molten metal is also prevented from causing burrs. The gas in the cavity is discharged towards the liquid inlet through the exhaust channel, which effectively increases the speed of gas discharge after the molten metal enters the cavity, so that the gas can be completely discharged from the cavity before the molten metal solidifies. This can effectively solve the problem of thin skin and pores on the product surface caused by poor exhaust during the production process. Attached Figure Description

[0017] Figure 1 This is a front view of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the flow channel plate in this invention;

[0019] Figure 3 In this invention Figure 2 Enlarged structural diagram at point A in the middle.

[0020] Reference numerals: 10, runner plate; 11, gate; 12, boss one; 13, fixing block; 14, boss two; 15, liquid inlet hole; 20, base plate; 30, fixed mold; 40, moving mold. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] After conventional gravity casting molds are closed, the gap between the gate plate and the cavity plate is very small, which is not conducive to the venting of gas. When molten metal flows into the cavity from the gate, in addition to the trace amount of gas dissolved in the molten metal itself, some air will also be carried into the cavity along with the molten metal. If these gases are not vented in time, they will form pores inside the product during the solidification process of the molten metal, resulting in product defects.

[0023] Example 1

[0024] The exhaust structure includes a flow channel plate 10, which has a contact surface and a non-contact surface. A gate 11 is provided on the non-contact surface of the flow channel plate 10. Multiple sets of liquid inlet holes 15 communicating with the gate 11 are provided on the contact surface of the flow channel plate 10. A boss 12 is integrally formed on the contact surface of the flow channel plate 10 and around each set of liquid inlet holes 15. Multiple sets of fixing blocks 13 are provided on the boss 12. The gap between any two sets of adjacent fixing blocks 13 is connected to form an exhaust channel. The exhaust channel guides the gas on the contact surface to be discharged from the exhaust channel towards the liquid inlet hole.

[0025] The molten metal is poured in through the gate 11 and then distributed to each cavity through the inlet hole 15. The boss is designed to cooperate with the cavity to form a relatively closed space for the molten metal to form. The fixing block 13 is set on the contact surface between the runner plate 10 and the cavity. It not only increases the venting gap between the two, but also prevents the molten metal from flowing out and causing burrs. The gas in the cavity is discharged through the venting channel towards the inlet hole 15, which effectively increases the speed of gas discharge after the molten metal enters the cavity. This allows the gas to be completely discharged from the cavity before the molten metal solidifies, which can effectively solve the problem of thin skin and pores on the product surface caused by poor venting during the production process.

[0026] To further improve the exhaust problem, the contact surface of the flow channel plate 10 is integrally formed with bosses 14 at the four corners. The bosses 14 are located at the four corners of the contact surface of the flow channel plate 10, which can further increase the distance between the flow channel plate 11 and the cavity.

[0027] In order to protect the structure of the fixing block 13 from being bumped or worn, the height of the second boss 14 is greater than the sum of the height of the first boss 12 and the height of the fixing block 13.

[0028] To prevent molten metal from overflowing, the height of the fixing block 13 is between 0.05 and 0.15 mm, and the gap between any two adjacent fixing blocks is less than 1 mm. When the height of the fixing block 13 is greater than 0.15 mm, molten metal will overflow, and when the height of the fixing block 13 is less than 0.05 mm, the exhaust speed will decrease.

[0029] In one embodiment, the height of the boss 12 is less than 1 mm to avoid the problem of molten metal overflowing due to excessive height of the boss 12.

[0030] Example 2

[0031] The gravity casting mold includes: a fixed mold 30; a movable mold 40; and an venting structure as described above. The contact surface of the runner plate 10 is fixedly installed with the top of the fixed mold 30. A bottom plate 20 is provided at the bottom of the fixed mold 30. The movable mold 40 is slidably disposed between the contact surface of the bottom plate 20 and the runner plate 10. Matching cavities are provided on the fixed mold 30 and the movable mold 40.

[0032] The molten metal is poured in through the gate and then distributed through the inlet hole to various cavities on the fixed mold 30 and the moving mold 40. The boss 12 cooperates with the cavity to form a relatively closed space for the molten metal to form. The fixing block 13 is set on the contact surface between the runner plate 10 and the cavity, which not only increases the venting gap between them, but also prevents the molten metal from flowing out and causing burrs. The gas in the cavity is discharged through the venting channel towards the inlet hole 15, effectively increasing the gas discharge speed after the molten metal enters the cavity, so that the gas can be completely discharged from the cavity before the molten metal solidifies. This effectively solves the problem of thin skin and porosity on the product surface caused by poor venting during the production process. After the molten metal solidifies, the moving mold 40 is moved to separate it from the fixed mold.

[0033] Gravity casting molds with venting structures can enhance gas expulsion without affecting product molding.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An exhaust structure, characterized in that: Includes a runner plate (10), the runner plate (10) has a contact surface and a non-contact surface, the non-contact surface of the runner plate (10) is provided with a gate (11), the contact surface of the runner plate (10) is provided with multiple sets of liquid inlet holes (15) communicating with the gate (11), the contact surface of the runner plate (10) is integrally formed with a boss (12) around each set of liquid inlet holes (15), the boss (12) is provided with multiple sets of fixing blocks (13), the gap between any two sets of adjacent fixing blocks (13) is connected to form an exhaust channel, the exhaust channel guides the gas on the contact surface to be discharged from the exhaust channel towards the liquid inlet hole; The contact surface of the flow channel plate (10) is integrally formed with bosses (14) at the four corners. The height of the second boss (14) is greater than the sum of the height of the first boss (12) and the height of the fixed block (13); The height of the fixing block (13) is between 0.05 and 0.15 mm, and the gap between any two adjacent fixing blocks (13) is less than 1 mm; The height of the boss (12) is less than 1 mm.

2. A gravity casting mold, characterized in that, include: Fixed mold (30); Moving model (40); And the exhaust structure as described in claim 1, wherein the contact surface of the flow channel plate (10) is fixedly installed with the top of the fixed mold (30), the bottom of the fixed mold (30) is provided with a bottom plate (20), and a moving mold (40) is slidably disposed between the contact surface of the bottom plate (20) and the flow channel plate (10).

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