Air hole preventing die-casting mechanism and die-casting die
By designing gas pre-exhaust channels and gas reserved gaps in the die-casting mechanism, the problem of gas being unable to be discharged during the die-casting process is solved, and high-quality molding and performance improvement of die-cast parts are achieved.
Patent Information
- Application Number
- CN202422748453.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-11-11
AI Technical Summary
During the die-casting process, the gas in the closed cavity cannot be discharged in time, resulting in internal or surface porosity defects in the die-casting, affecting the performance of the die-casting.
A die-casting mechanism to prevent air holes is designed, which includes a fixed die, a movable die, a sleeve and a hole-grooving column. A gas pre-discharge channel is formed on the movable die, and a gas reserved gap is formed between the sleeve and the gas pre-discharge channel. The molten metal is pushed and gradually flows into the gas pre-discharge channel, ensuring that the gas is discharged into the gas reserved gap, thereby preventing the gas from remaining inside or on the surface of the die-cast part.
It effectively reduces the pores inside or on the surface of die castings, improves the molding quality and performance of die castings, ensures that the molten metal wraps the gas and is formed in the pre-cut parts, simplifies the cutting process of pre-cut parts, and reduces the waste of molten metal.
Smart Images
Figure CN223352912U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of die-casting dies, and in particular to a die-casting mechanism and a die-casting die that are resistant to air holes. Background Art
[0002] The die-casting process of the die-casting mold is to use high pressure to press the molten metal (such as molten aluminum, etc.) into the closed cavity formed between the movable mold and the fixed mold of the die-casting mold, and finally solidify and form under the action of pressure.
[0003] However, during the die-casting process, the gas in the closed cavity is easily gathered in the last filled part of the metal liquid (such as the deep cavity of the die-casting or the end of the column, etc.) under the push of the molten metal. When these gases cannot be discharged outside the closed cavity in time, it is easy to cause defects such as internal pores, post-processing pores or surface pores in the die-casting. These defects directly affect the internal and surface quality of the die-casting, causing the die-casting to leak water, oil or air during use, seriously affecting the performance of the die-casting. Utility Model Content
[0004] The purpose of the present disclosure is to overcome the deficiencies in the prior art and to provide a die-casting mechanism and a die-casting mold that are resistant to pores and that improve the molding quality of die-cast parts, thereby improving the performance of die-cast parts.
[0005] The purpose of this disclosure is achieved through the following technical solutions:
[0006] A die-casting mechanism for preventing air holes, comprising a fixed die, a movable die, a sleeve, and a hole-grooving column, wherein the fixed die is formed with a first molding cavity, and the movable die is formed with a second molding cavity, wherein the fixed die and the movable die are arranged opposite to each other so that when the fixed die and the movable die are closed, the first molding cavity and the second molding cavity together form a sealed molding cavity for the flow of molten metal to form a die-casting part;
[0007] The movable mold is formed with a gas pre-exhaust channel, which is connected to the second molding cavity. The sleeve is embedded in the gas pre-exhaust channel, and the hole-groove molding column is movably arranged in the sleeve and the gas pre-exhaust channel in sequence; the end of the sleeve facing the second molding cavity is a hollow frustum-shaped structure, so that a gas reserved gap is formed between the outer peripheral wall of the sleeve and the inner peripheral wall of the gas pre-exhaust channel, and the gas reserved gap is connected to the gas pre-exhaust channel.
[0008] In one embodiment, the diameter of the gas reserved gap gradually decreases in the direction away from the fixed mold.
[0009] In one embodiment, the diameter of the gas reserved gap near the top of the movable mold is 1 mm-1.2 mm.
[0010] In one embodiment, the preset depth of the gas reserved gap is 4.8 mm-5.5 mm.
[0011] In one embodiment, the preset depth is 5 mm.
[0012] In one embodiment, the hollow frustum-shaped structure is a truncated cone, and the cross section of the truncated cone is an isosceles trapezoid.
[0013] In one embodiment, the preset angle between the hypotenuse and the height of the isosceles trapezoid is 1°-2°.
[0014] In one embodiment, the movable mold forms a smooth guide portion at the connection point between the second molding cavity and the gas pre-exhaust channel.
[0015] In one embodiment, an arc-shaped drainage surface is formed on the outer peripheral wall of one end of the hole-groove forming column facing the second forming cavity, and the arc-shaped drainage surface is used to guide the molten metal to flow into the gas reserved gap along the outer peripheral wall of the hole-groove forming column.
[0016] A die-casting mold comprises the anti-air hole die-casting mechanism described in any one of the above embodiments.
[0017] Compared with the prior art, the present disclosure has at least the following advantages:
[0018] The anti-air hole die-casting mechanism disclosed in the present invention, when the fixed mold and the movable mold are closed, the first molding cavity of the fixed mold and the second molding cavity of the movable mold jointly form a closed mold cavity, and the gas pre-exhaust channel of the movable mold is connected to the second molding cavity, so that the metal liquid gradually flows from the inside of the closed mold cavity to the gas pre-exhaust channel according to the preset flow trajectory, ensuring that the gas in the closed mold cavity reaches the gas pre-exhaust channel, which is the last filling part of the die-casting part, under the push of the metal liquid. In addition, since the end of the sleeve facing the second molding cavity is a hollow cone-shaped structure, the outer peripheral wall of the sleeve and the inner peripheral wall of the gas pre-exhaust channel are connected. A gas reserved gap is formed between the walls, and the gas reserved gap is connected to the gas pre-discharge channel, ensuring that the metal liquid continues to push the gas through the gas pre-discharge channel and finally enters the gas reserved gap, ensuring that the gas is finally discharged into the gas reserved gap, and the metal liquid wraps the gas to be formed in the gas reserved gap, that is, to form a pre-cut component after the last filled part of the die casting, avoiding the gas remaining in the last filled part of the die casting after the die casting is formed, that is, reducing the pores inside or on the surface of the die casting, thereby improving the molding quality of the die casting, and then improving the performance of the die casting. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.
[0020] Figure 1 This is a schematic structural diagram of a die-casting mechanism for preventing air holes according to an embodiment of the present disclosure;
[0021] Figure 2 for Figure 1 A cross-sectional view of the die-casting mechanism for preventing air holes is shown;
[0022] Figure 3 for Figure 2 A partial enlarged view shown in the middle;
[0023] Figure 4 for Figure 3 The partial enlarged view shown at B in the middle;
[0024] Figure 5 The direction of the arrow in the figure is the preset flow trajectory of the molten metal from the closed cavity to the gas pre-exhaust channel;
[0025] Figure 6 It is a structural schematic diagram of a die casting in one direction;
[0026] Figure 7 It is a structural schematic diagram of the die casting in another direction;
[0027] Figure 8 for Figure 7 The schematic diagram of the structure of the die casting cutting out pre-cut parts is shown.
[0028] Figure numerals: 10, die-casting mechanism for preventing air holes; 100, fixed mold; 110, first molding cavity; 200, movable mold; 210, second molding cavity; 220, gas pre-exhaust channel; 300, sleeve; 310, large-diameter end; 320, small-diameter end; 301, gas reserved gap; 400, hole-groove molding column; 500, smooth guide portion; 600, arc-shaped guide surface; 20, die-casting part; 21, pre-cut parts. DETAILED DESCRIPTION
[0029] To facilitate understanding of the present disclosure, a more comprehensive description of the present disclosure will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present disclosure. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure.
[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.
[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. The terms used herein in the specification of this disclosure are intended only to describe specific embodiments and are not intended to limit this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0032] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure is further described in detail below with reference to specific embodiments:
[0033] Please also refer to Figures 1 to 8 The anti-air hole die-casting mechanism 10 of one embodiment includes a fixed mold 100, a movable mold 200, a sleeve 300 and a hole-grooving forming column 400. The fixed mold 100 is formed with a first molding cavity 110, and the movable mold 200 is formed with a second molding cavity 210. The fixed mold 100 and the movable mold 200 are arranged opposite to each other so that when the fixed mold 100 and the movable mold 200 are closed, the first molding cavity 110 and the second molding cavity 210 together form a closed mold cavity for the flow of molten metal and the molding of the die-casting 20. The movable mold 200 is formed with a gas pre-exhaust channel 220, which is connected to the second molding cavity 210. The cylinder 300 is embedded in the gas pre-exhaust channel 220, and the hole-groove forming column 400 is movably arranged in sequence through the cylinder 300 and the gas pre-exhaust channel 220; the end of the cylinder 300 facing the second forming cavity 210 is a hollow frustum-shaped structure, specifically a large-diameter end 310 and a small-diameter end 320, so that a gas reserved gap 301 is formed between the outer peripheral wall of the cylinder 300 and the inner peripheral wall of the gas pre-exhaust channel 220, and the gas reserved gap 301 is connected to the gas pre-exhaust channel 220, wherein the small-diameter end 320 is arranged toward the second forming cavity 210, and the large-diameter end 310 is arranged away from the second forming cavity 210.
[0034] It can be understood that when the fixed mold 100 and the movable mold 200 are closed, the first molding cavity 110 of the fixed mold 100 and the second molding cavity 210 of the movable mold 200 form a closed mold cavity together, and the gas pre-exhaust channel 220 of the movable mold 200 is connected to the second molding cavity 210, so that the metal liquid gradually flows from the inside of the closed mold cavity to the gas pre-exhaust channel 220 according to the preset flow trajectory, ensuring that the gas in the closed mold cavity reaches the gas pre-exhaust channel 220, which is the last filling part of the die casting 20, under the push of the metal liquid. In addition, since the end of the sleeve 300 facing the second molding cavity 210 is a hollow cone-shaped structure, the outer peripheral wall of the sleeve 300 and the inner wall of the gas pre-exhaust channel 220 are connected. A gas reserved gap 301 is formed between the peripheral walls, and the gas reserved gap 301 is connected to the gas pre-exhaust channel 220, ensuring that the molten metal continues to push the gas through the gas pre-exhaust channel 220 and finally enters the gas reserved gap 301, ensuring that the gas is finally discharged into the gas reserved gap 301, and the molten metal wraps the gas to be formed in the gas reserved gap 301, that is, to form the pre-cut part 21 after the last filled part of the die casting 20, avoiding the gas remaining in the last filled part of the die casting 20 after the die casting 20 is formed, that is, reducing the pores inside or on the surface of the die casting 20, thereby improving the molding quality of the die casting 20, and then improving the performance of the die casting 20.
[0035] It should be noted that after the die casting 20 is formed, the pre-cut part 21 containing the pores needs to be cut off from the last filled portion of the die casting 20 .
[0036] It can also be understood that since the pre-cut component 21 is formed in the gas reserved gap 301, and the end of the sleeve 300 facing the second molding cavity 210 is a hollow frustum-shaped structure, the molten metal is molded in the gas reserved gap 301 around the outer peripheral wall of the hollow frustum-shaped structure, so that the structure of the pre-cut component 21 after molding is simple, on the one hand ensuring the convenience of removing the pre-cut component 21, and on the other hand reducing the waste of molten metal.
[0037] like Figure 3 、 Figure 4 and Figure 6 As shown, in one embodiment, the diameter of the gas reserved gap 301 gradually becomes smaller in the direction away from the fixed mold 100, that is, the diameter of the gas reserved gap 301 gradually becomes smaller from the small-diameter end 320 adjacent to the large-diameter end 310, ensuring that the gas remains in the gas reserved gap 301 under the gradual push of the metal liquid, avoiding the gas from being retained in the gas pre-exhaust channel 220, reducing the generation of pores on the die-casting 20, and thereby improving the molding quality of the die-casting 20.
[0038] Furthermore, if Figure 4 、 Figures 6 to 8As shown, in one embodiment, the diameter of the gas reserved gap 301 near the top of the movable mold 200 is 1mm-1.2mm, that is, the diameter of the gas reserved gap 301 near the small-diameter end 320 is 1mm-1.2mm. In this embodiment, if the diameter of the gas reserved gap 301 near the top of the movable mold 200 is less than 1mm, the wall thickness of the formed pre-cut part 21 is relatively thin, resulting in the pre-cut part 21 being easily broken automatically when the die-casting 20 is ejected and remaining in the die-casting mechanism, affecting the molding efficiency of the die-casting 20; if the diameter of the gas reserved gap 301 near the top of the movable mold 200 is greater than 1.2mm, the wall thickness of the formed pre-cut part 21 is relatively thick, which easily makes it difficult to cut the pre-cut part 21.
[0039] Furthermore, if Figure 4 and Figure 6 As shown, in one embodiment, the preset depth of the gas reserved gap 301 is 4.8mm-5.5mm. In this embodiment, since the preset depth of the gas reserved gap 301 is 4.8mm-5.5mm, the depth of the formed pre-cut part 21 is 4.8mm-5.5mm. If the depth of the pre-cut part 21 is less than 4.8mm, it is easy for the gas to not fully enter the gas reserved gap 301, and some gas will remain in the last filled part of the die-casting 20, causing pores to appear inside or on the surface of the die-casting 20, thereby affecting the molding quality of the die-casting 20; if the depth of the pre-cut part 21 is greater than 5.5mm, it is easy to make it difficult to eject the die-casting 20, thereby affecting the molding efficiency of the die-casting 20. Specifically, in one embodiment, the preset depth of the gas reserved gap 301 is 5mm.
[0040] In one embodiment, Figure 6 As shown, the hollow frustum-shaped structure is a truncated cone, and the cross section of the truncated cone is an isosceles trapezoid, so that the inner peripheral wall of the pre-cut component 21 forms a truncated cone, ensuring the smoothness of the pre-cut component 21 when ejected.
[0041] Furthermore, if Figure 4 and Figure 6 As shown, in one embodiment, the preset angle between the hypotenuse and the height of the isosceles trapezoid is 1°-2°, so that the wall thickness of the pre-cut part 21 gradually becomes thinner from the small-diameter end 320 toward the large-diameter end 310, and has a certain inclination angle, ensuring that the pre-cut part 21 is smoother when ejected.
[0042] like Figure 3 and Figure 4As shown, in one embodiment, the movable mold 200 forms a smooth guide portion 500 at the connection point between the second molding cavity 210 and the gas pre-exhaust channel 220, ensuring that the molten metal flows smoothly from the smooth guide portion 500 into the gas pre-exhaust channel 220 along a preset flow trajectory in the closed mold cavity, and at the same time, ensuring that the gas enters the gas pre-exhaust channel 220 smoothly under the push of the molten metal.
[0043] Furthermore, if Figure 3 、 Figure 4 and Figure 6 As shown, in one embodiment, an arc-shaped guide surface 600 is formed on the outer peripheral wall of the hole-groove forming column 400 at one end facing the second forming cavity 210. The arc-shaped guide surface 600 is used to guide the molten metal along the outer peripheral wall of the hole-groove forming column 400 to flow into the gas reserved gap 301, ensuring that the gas is smoothly retained in the pre-cut component 21 under the wrapping of the molten metal, reducing the generation of pores inside or on the surface of the die-casting 20, thereby improving the molding quality of the die-casting 20.
[0044] The present disclosure further provides a die-casting mold, comprising the anti-air hole die-casting mechanism 10 described in any one of the above embodiments.
[0045] Compared with the prior art, the present disclosure has at least the following advantages:
[0046] The air hole-proof die-casting mechanism 10 disclosed in the present invention, when the fixed mold 100 and the movable mold 200 are closed, the first molding cavity 110 of the fixed mold 100 and the second molding cavity 210 of the movable mold 200 jointly form a closed mold cavity, and the gas pre-exhaust channel 220 of the movable mold 200 is connected to the second molding cavity 210, so that the metal liquid gradually flows from the inside of the closed mold cavity to the gas pre-exhaust channel 220 according to the preset flow trajectory, ensuring that the gas in the closed mold cavity reaches the gas pre-exhaust channel 220, which is the last filling part of the die-casting 20, under the push of the metal liquid. In addition, since the end of the sleeve 300 facing the second molding cavity 210 is a hollow cone-shaped structure, the outer peripheral wall of the sleeve 300 is connected to the gas pre-exhaust channel 220. A gas reserved gap 301 is formed between the inner peripheral walls of the channel 220, and the gas reserved gap 301 is connected to the gas pre-exhaust channel 220, ensuring that the metal liquid continues to push the gas through the gas pre-exhaust channel 220 and finally enters the gas reserved gap 301, ensuring that the gas is finally discharged into the gas reserved gap 301, and the metal liquid wraps the gas to be formed in the gas reserved gap 301, that is, to form the pre-cut part 21 after the last filled part of the die casting 20, avoiding the gas remaining in the last filled part of the die casting 20 after the die casting 20 is formed, that is, reducing the pores inside or on the surface of the die casting 20, thereby improving the molding quality of the die casting 20, and then improving the performance of the die casting 20.
[0047] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person of ordinary skill in the art could make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the present patent shall be determined by the appended claims.
Claims
1. A die-casting mechanism for preventing air holes, comprising a fixed die, a movable die, a sleeve and a hole-grooving column, wherein the fixed die is formed with a first molding cavity, the movable die is formed with a second molding cavity, the fixed die and the movable die are arranged opposite to each other so that when the fixed die and the movable die are closed, the first molding cavity and the second molding cavity together form a closed molding cavity, wherein the closed molding cavity is used for the flow of molten metal and the molding of the die-casting, characterized in that: The movable mold is formed with a gas pre-exhaust channel, which is connected to the second molding cavity. The sleeve is embedded in the gas pre-exhaust channel, and the hole-groove molding column is movably arranged in the sleeve and the gas pre-exhaust channel in sequence; the end of the sleeve facing the second molding cavity is a hollow frustum-shaped structure, so that a gas reserved gap is formed between the outer peripheral wall of the sleeve and the inner peripheral wall of the gas pre-exhaust channel, and the gas reserved gap is connected to the gas pre-exhaust channel.
2. The anti-porosity die-casting mechanism according to claim 1, characterized in that: In the direction away from the fixed mold, the diameter of the gas reserved gap gradually becomes smaller.
3. The anti-porosity die-casting mechanism according to claim 2, characterized in that: The diameter of the gas reserved gap near the top of the movable mold is 1 mm to 1.2 mm.
4. The anti-porosity die-casting mechanism according to claim 2, characterized in that: The preset depth of the gas reserved gap is 4.8mm-5.5mm.
5. The anti-porosity die-casting mechanism according to claim 4, characterized in that: The preset depth is 5 mm.
6. The anti-porosity die-casting mechanism according to claim 1, characterized in that: The hollow frustum-shaped structure is in the shape of a truncated cone, and the cross section of the truncated cone is an isosceles trapezoid.
7. The anti-porosity die-casting mechanism according to claim 6, characterized in that: The preset angle between the hypotenuse and the height of the isosceles trapezoid is 1°-2°.
8. The anti-porosity die-casting mechanism according to claim 1, characterized in that: The movable mold forms a smooth guide portion at the connection point between the second molding cavity and the gas pre-exhaust channel.
9. The anti-porosity die-casting mechanism according to claim 1, characterized in that: An arc-shaped drainage surface is formed on the outer peripheral wall of one end of the hole-groove forming column facing the second forming cavity, and the arc-shaped drainage surface is used to guide the molten metal to flow into the gas reserved gap along the outer peripheral wall of the hole-groove forming column.
10. A die-casting mold, characterized in that: A die-casting mechanism comprising the anti-air hole mechanism according to any one of claims 1 to 9.