Novel local air exhaust needle structure and air exhaust method thereof
By designing a novel localized venting needle structure, the problem of localized air holes in die-casting molds was solved, enabling effective gas extraction and aluminum chip removal, thereby improving product quality and production efficiency.
Patent Information
- Application Number
- CN202511803335.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-02-10
AI Technical Summary
Existing technologies are insufficient to effectively solve the problem of porosity in localized areas of die-casting molds, especially in corners and other areas where air is trapped, leading to a decline in product quality.
A novel local evacuation needle structure is designed, including a needle, a needle sleeve, and a connecting block. By adding multiple exhaust surfaces between the needle and the needle sleeve and setting an evacuation channel inside the needle, combined with a high-temperature resistant sealing ring and an evacuation interface, gas extraction and removal can be achieved. At the same time, after die casting, residual aluminum chips are removed through the air blowing interface to keep the channel unobstructed.
It effectively reduces the probability of localized pores, improves product yield, and ensures unobstructed air extraction channels and product quality.
Smart Images
Figure CN121491304A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a suction needle, and more specifically to a novel local suction needle structure.
[0002] This invention also relates to a method for evacuating air using a novel local evacuation needle structure. Background Technology
[0003] A common problem encountered in aluminum die casting mold production is porosity. With the development of technology, there are more ways to improve this problem. Existing die casting structures use slag bags, overflow channels, venting blocks, and vacuuming to remove slag and vent. Large die casting molds can control most of the porosity and reduce porosity, but it is difficult to effectively solve the problem of porosity in localized areas.
[0004] Currently, die-casting molds generally have vacuuming mechanisms and venting blocks, but it is difficult to solve the problem of trapped air holes in local corners. Summary of the Invention
[0005] To address the problem of localized porosity in die-cast products, this invention provides a novel localized evacuation needle structure and its evacuation method, which reduces localized porosity in die-cast products and improves product yield.
[0006] This invention provides the following technical solution: A novel localized evacuation needle structure includes a needle, a needle sleeve, and a connecting block. One end of the needle is mounted on the connecting block, and the needle sleeve is fixed to the outside of the other end of the needle by a quick-change needle sleeve block. Multiple venting surfaces are added to the side between the needle and the needle sleeve at locations with frequent air holes in the product. An evacuation channel is opened inside the needle, and a high-temperature resistant sealing ring is added to the needle and the needle sleeve. An evacuation port and a blowing port are installed on the connecting block. Gas is extracted from the head of the evacuation needle through the evacuation port, and residual aluminum chips are blown away through the blowing port after die casting.
[0007] Furthermore, the air blowing interface has a sealing needle, a spring is installed on the sealing needle, and a pressure block is provided above the spring.
[0008] Furthermore, high-temperature resistant sealing rings are provided between the outer wall of the needle and the inner wall of the needle sleeve, at the contact points between the needle sleeve and the quick-change block of the needle sleeve, and at the contact points between the needle and the connecting block.
[0009] Furthermore, a slag discharge and air extraction groove is provided between the outer wall of the extraction needle and the inner wall of the needle sleeve.
[0010] Furthermore, an aluminum baffle plate is provided on the connecting block.
[0011] A novel method for evacuating air using a local evacuation needle structure, comprising the following steps: S1. The position of the suction needle is selected at the air trapping location, and the key part is a deep cavity rib or a deep cavity column that is easy to trap air. S2. After the mold is closed, the evacuation needle draws gas through the evacuation interface connector. The evacuation interface is connected to the evacuation machine of the die casting machine. After the aluminum liquid is squeezed, the gas is trapped around the needle. The gas is drawn out to the outside of the cavity through the exhaust surface of the needle side wall and the evacuation channel. S3. To prevent aluminum chips from clogging the exhaust surface and affecting the air extraction, after die casting is completed, the inner needle is pulled out by the hydraulic cylinder. The air blowing interface is connected to the die casting air blower, and the air blowing starts to work, blowing out the blocked aluminum chips from the exhaust surface, and entering the next cycle.
[0012] Furthermore, the air blowing interface has a sealing needle with a spring installed on it. When air blowing is not working, the sealing needle is pressed down to seal the air blowing pipe under the action of the spring force. When air blowing is working, the suction is not working, and the sealing needle moves up under the airflow to open the passage.
[0013] Compared with the prior art, the beneficial effects of the present invention are: This invention focuses on improving the porosity around local pinholes. By extracting gas around the pin through the gap between the pin and the pin sleeve, gas is extracted from the head of the extraction pin through the extraction port during die casting production, which plays a role in venting and reducing the porosity caused by trapped gas. After die casting is completed, residual aluminum chips are blown away through the blowing port to keep the venting surface and extraction channel unobstructed, and then enter the next production cycle. This reduces the probability of porosity and improves product quality. Attached Figure Description
[0014] Figure 1 This is a schematic diagram showing the locations of frequent air holes in the product. Figure 2 for Figure 1 Cross-sectional view along the BB direction; Figure 3 This is a schematic diagram of the structure of the present invention; Figure 4 This is an enlarged view of the exhaust surface of the present invention; Figure 5 This is a schematic diagram of the air extraction channel of the present invention; Figure 6 This is a diagram illustrating the principle of air extraction. Figure 7 This is a schematic diagram of the slag discharge and air extraction tank structure. Figure 8 This is a schematic diagram of the air extraction and exhaust principle. Figure 9 This is a magnified view of a portion of the connecting block; Figure 10 This is a schematic diagram illustrating the application of the present invention.
[0015] In the diagram: 1. Exhaust surface; 2. Air extraction channel; 3. High-temperature resistant sealing ring; 4. Slag discharge and air extraction groove.
[0016] 10. Needle, 20. Needle sleeve, 30. Connecting block, 40. Needle sleeve quick-change block, 50. Sealing needle, 501. Spring, 60. Pressure block, 70. Aluminum baffle plate. Detailed Implementation
[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0018] Please see Figure 3 The present invention discloses a novel local venting needle structure, comprising a needle 10, a needle sleeve 20, and a connecting block 30. One end of the needle 10 is mounted on the connecting block 30, and the other end of the needle 10 is fixed to the needle sleeve 20 by a needle sleeve quick-change block 40. This structure is used at locations A (where air holes frequently occur in the product). Figure 1 , Figure 2 Multiple venting surfaces 1 are added to the side between the needle 10 and the needle sheath 20. Figure 4 The needle 10 has an internal air extraction channel 2 ( Figure 5 High-temperature resistant sealing rings 3 are added to needle 10 and needle sleeve 20 to increase air tightness. A suction port G1 and a blowing port G2 are installed on the connecting block 30. Gas is extracted from the head of the suction needle through the suction port G1, and residual aluminum chips are blown away through the blowing port G2 after die casting is completed.
[0019] Figure 9 As shown, the air blowing interface G2 has a sealing needle 50, a spring 501 is installed on the sealing needle 50, and a pressure block 60 is set above the spring 501. When evacuating, the air blowing does not work, and the sealing needle 50 is pressed down to seal the air blowing pipe under the action of the spring force. When blowing, the air suction does not work, and the sealing needle 50 moves up under the airflow to open the passage.
[0020] High-temperature resistant sealing rings 3 are provided between the outer wall of needle 10 and the inner wall of needle sleeve 20, at the contact point between needle sleeve 20 and needle sleeve quick-change block 40, and at the contact point between needle 10 and connecting block 30.
[0021] Figure 7 A slag discharge and air extraction groove 4 is opened between the outer wall of the air extraction needle 10 and the inner wall of the needle sleeve 20, which improves the air extraction effect and prevents clogging.
[0022] An aluminum baffle plate 70 is installed on the connecting block 30. This prevents the aluminum splatter from burning the exhaust pipe on the parting surface, thus providing protection.
[0023] The air extraction port G1 and the air blowing port G2 are connected to the die-casting machine side through the air extraction pipe to carry out air extraction and air blowing operations.
[0024] During die casting production, gas is extracted from the head of the extraction needle through the extraction port G1 to exhaust air and reduce trapped air that could cause porosity. After die casting is completed, residual aluminum chips are blown away through the blowing port G2 to keep the exhaust surface and extraction channel unobstructed before entering the next production cycle.
[0025] Figure 6 , Figure 8 As shown, the air extraction process: 1. The suction needle should be placed in a location where air is trapped, especially in critical areas with deep cavity ribs or deep cavity columns where air is easily trapped. 2. After the mold is closed, the evacuation needle draws gas through the evacuation interface G1 connector. After the aluminum liquid is squeezed, the gas is trapped around the needle. The gas is drawn out to the outside of the cavity through the evacuation channel 2 via the exhaust surface 1 on the side wall of the needle.
[0026] Air is trapped in the cavity at point C of needle 10. The air extraction port G1 is connected to the air extraction pump of the die-casting machine.
[0027] 3. To prevent the exhaust surface from being blocked by aluminum chips and affecting the exhaust process, after the die casting is completed, the inner needle is pulled out by the action of the oil cylinder. The air blowing interface G2 is connected to the die casting air blower, and the air blowing starts to work, blowing out the blocked aluminum chips from the exhaust surface 1 (aluminum chip blowing out schematic position D), and then entering the next cycle.
[0028] The high-temperature resistant sealing ring 3 needs to be checked regularly to confirm whether it is working properly and whether there is any leakage.
[0029] This invention focuses on improving the peripheral porosity of localized pinholes. By extracting gas around the needle through the gap between the needle and the needle sheath, it reduces the likelihood of porosity and improves product quality. It has shown good results in applications involving localized gas trapping, effectively solving the problem of localized porosity.
[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A novel local evacuation needle structure, characterized in that: Includes a needle (10), a needle sleeve (20), and a connecting block (30). One end of the needle (10) is mounted on the connecting block (30), and the needle sleeve (20) is fixed on the outside of the other end of the needle (10) by a needle sleeve quick-change block (40). Multiple exhaust surfaces (1) are added on the side between the needle (10) and the needle sleeve (20) at the location (A) where there are multiple air holes in the product. An air extraction channel (2) is opened inside the needle (10). A high-temperature resistant sealing ring (3) is added to the needle (10) and the needle sleeve (20). An air extraction interface (G1) and an air blowing interface (G2) are installed on the connecting block (30). The air is extracted from the head of the air extraction needle through the air extraction interface (G1), and the residual aluminum chips are blown away through the air blowing interface (G2) after the die casting is completed.
2. The novel local evacuation needle structure according to claim 1, characterized in that: The air blowing port (G2) has a sealing needle (50), a spring (501) is installed on the sealing needle (50), and a pressure block (60) is provided above the spring (501).
3. The novel local evacuation needle structure according to claim 1, characterized in that: High-temperature resistant sealing rings (3) are provided between the outer wall of the needle (10) and the inner wall of the needle sleeve (20), at the contact point between the needle sleeve (20) and the needle sleeve quick-change block (40), and at the contact point between the needle (10) and the connecting block (30).
4. The novel local evacuation needle structure according to claim 1, characterized in that: A slag discharge and air extraction groove (4) is provided between the outer wall of the extraction needle (10) and the inner wall of the needle sleeve (20).
5. The novel local evacuation needle structure according to claim 1, characterized in that: An aluminum baffle plate (70) is provided on the connecting block (30).
6. The air extraction method of the novel local air extraction needle structure according to claim 1, characterized in that: The steps are as follows: S1. The position of the suction needle is selected at the air trapping location, and the key part is a deep cavity rib or a deep cavity column that is easy to trap air. S2. After the mold is closed, the suction needle draws gas through the suction port (G1) connector. The suction port (G1) is connected to the suction machine of the die casting machine. After the aluminum liquid is squeezed, the gas is trapped around the needle. The gas is drawn out to the outside of the cavity through the suction channel (2) through the exhaust surface (1) on the side wall of the needle. S3. In order to prevent the exhaust surface from being blocked by aluminum chips and affecting the exhaust, after the die casting is completed, the inner needle is pulled out by the action of the oil cylinder. The air blowing interface (G2) is connected to the die casting air blower, and the air blowing starts to work, blowing out the blocked aluminum chips from the exhaust surface (1) and entering the next cycle of work.
7. The air extraction method of a novel local air extraction needle structure according to claim 6, characterized in that: The air blowing port (G2) has a sealing needle (50) inside, and a spring (501) is installed on the sealing needle (50). When the blowing function is not working, the sealing needle (50) is pressed down to seal the blowing pipe under the action of the spring force. When blowing, the suction function is not working. Under the blowing of the airflow, the sealing needle (50) moves up to open the passage.