Extrusion pin structure of needle cylinder type die-casting die
Through the extrusion pin structure of the syringe die casting mold, the problem that traditional die casting mold extrusion pin cannot be timely replenished in complex, uneven wall thickness die castings is solved, and high-quality production and efficient production of castings are achieved.
Patent Information
- Application Number
- CN202422705216.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-08-22
- Estimated Expiration
- 2034-11-07
AI Technical Summary
When traditional die casting mold extrusion pins face die castings with complex structures and uneven wall thickness, they cannot be re-shrinkable in time, resulting in shrinkage and loosening of the castings, affecting the quality and performance of the castings.
A syringe die casting die-casting mold extrusion pin structure is designed, including a die frame, an extrusion cylinder, an extrusion assembly and a connecting rod. The power of the extrusion cylinder is transmitted through the connecting rod to achieve timely replenishment of the castings. The extrusion pin is used to apply pressure on the liquid metal to fill the area that has not yet solidified, and combined with the detachable connecting structure, it is convenient to replace the consumable parts.
Effectively reduce the formation of shrinkage holes and shrinkage, improve the quality and performance of castings, reduce waste rate, improve production efficiency and equipment utilization.
Smart Images
Figure CN223250523U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of die casting, and more specifically relates to a syringe-type die casting die extrusion pin structure. Background Art
[0002] The die-casting die extrusion pin is one of the important components of the die-casting die. After the molten metal is injected into the mold cavity, as the solidification process progresses, the extrusion pin moves in a timely manner to apply pressure to the key parts that require local shrinkage compensation. This can effectively encourage the molten metal to fill the cavity more fully, improve the internal quality of the casting, and reduce the occurrence of defects such as shrinkage cavities and shrinkage porosity. However, in the die-casting production process, traditional die-casting die extrusion pins have problems. When faced with die-castings with complex structures and uneven wall thicknesses, especially in thick and large areas, due to the concentration of heat, hot spots are easily generated, making this area the last part to solidify. In this case, traditional die-casting die extrusion pins are often unable to effectively compensate for these areas in a timely manner, resulting in defects such as shrinkage cavities and shrinkage porosity in thick and large areas of the casting, which seriously affects the quality and performance of the casting and reduces the product qualification rate. Utility Model Content
[0003] In order to solve the above technical problems, the utility model provides a syringe-type die-casting mold extrusion pin structure to solve the technical problem in the prior art that when the traditional die-casting mold extrusion pin encounters a die-casting with a complex structure and uneven wall thickness, it cannot perform shrinkage compensation in time, resulting in shrinkage cavities and shrinkage in the casting, causing a reduction in the quality and performance of the casting.
[0004] The purpose and effect of the needle-type die-casting die extrusion pin structure of the utility model are achieved by the following specific technical means:
[0005] A syringe-type die-casting mold extrusion pin structure includes a mold frame and an extrusion cylinder, an extrusion through-hole is opened on the mold frame, an extrusion assembly is passed through the extrusion through-hole, a mold core is provided on one side of the mold frame, one end of the extrusion assembly is passed through the mold core, one end of the mold core is clamped on the casting, and one end of the extrusion assembly passes through the mold core and contacts the casting; the extrusion cylinder is located on one side of the mold frame and is mounted on an extrusion cylinder mounting plate, a connecting rod is provided between the extrusion cylinder and the mold frame, and the two ends of the connecting rod are respectively connected to the extrusion cylinder and the extrusion assembly.
[0006] According to a preferred embodiment, the extrusion assembly includes a pressing sleeve, which is cylindrical, with a diameter smaller than the extrusion through-hole, one end of the pressing sleeve being inserted into the extrusion through-hole, and a connecting plate being provided at one end of the pressing sleeve, with a diameter larger than the extrusion through-hole and located on one side of the mold core, multiple groups of connecting holes being provided on the connecting plate and the mold frame, connecting screws being inserted into the connecting holes, and the pressing sleeve and the mold frame being detachably connected.
[0007] According to a preferred embodiment, an extrusion pin sleeve is provided on one side of the mold frame, the extrusion pin sleeve is inserted into the mold core, and one end of the pressing sleeve contacts the extrusion pin sleeve to form a syringe-type structure.
[0008] According to a preferred embodiment, the extrusion assembly also includes a fixed sleeve and an extrusion pin, the fixed sleeve is inserted into the pressing sleeve, an exit hole is opened at one end of the fixed sleeve, and the extrusion pin is inserted into the exit hole, the pressing sleeve and the extrusion pin outer sleeve; a limiting protrusion is provided at one end of the extrusion pin, the limiting protrusion is located in the fixed sleeve, and the diameter of the limiting protrusion is larger than the diameter of the exit hole.
[0009] According to a preferred embodiment, one end of the connecting rod is inserted into the fixing sleeve, a fixing rod is provided in the fixing sleeve, the fixing rod is located between the connecting rod and the extrusion pin, and both ends of the fixing rod are in contact with the connecting rod and the extrusion pin respectively, and a needle structure is formed by the extrusion pin, the fixing sleeve, the fixing rod and the connecting rod.
[0010] According to a preferred embodiment, a casting mouth is provided on the casting, the casting mouth is clamped at one end of the mold core, and the extrusion pin passes through the extrusion pin sleeve and is clamped in the casting mouth.
[0011] According to a preferred embodiment, multiple groups of assembly holes are provided on the extrusion cylinder and the extrusion cylinder mounting plate, and the assembly bolts are passed through the assembly holes. The extrusion cylinder and the extrusion cylinder mounting plate are detachably connected, and multiple groups of mounting holes are provided on both sides of the extrusion cylinder mounting plate.
[0012] Compared with the prior art, the present invention has the following beneficial effects:
[0013] 1. One end of the extrusion assembly can pass through the mold core and contact the casting. When there is a large local wall thickness or uneven cooling during the die-casting process, the extrusion cylinder can push the extrusion assembly through the connecting rod, and promptly apply pressure to the part of the casting that needs to be compensated for shrinkage, squeezing the liquid metal into the area that has not yet fully solidified, effectively filling the gap caused by solidification shrinkage, reducing the probability of shrinkage cavities and shrinkage, making the internal structure of the casting denser, thereby improving the quality and performance of the casting, reducing the scrap rate, and improving production efficiency.
[0014] 2. During the die-casting process, the extrusion pin sleeve and extrusion pin, due to their direct contact with the hot liquid metal and the mold cavity, are subject to significant pressure and friction, making them vulnerable parts requiring frequent replacement. The extrusion pin sleeve is inserted into the mold core, and the sleeve and mold frame are detachably connected. The entire assembly, including the extrusion pin and sleeve, can be disassembled and replaced simply by removing the connecting screws, eliminating the need to disassemble the entire mold as required with traditional molds. This replacement method significantly saves labor and improves production efficiency. Operators can complete the replacement of vulnerable parts in a shorter time, reducing mold downtime, thereby increasing the equipment's effective operating time and improving the overall production line capacity. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the structure of the utility model after assembly;
[0016] Figure 2 It is a schematic diagram of the structure of the utility model after being disassembled;
[0017] Figure 3 It is a cross-sectional view of the utility model;
[0018] Figure 4 It is a structural diagram of the fixed sleeve;
[0019] Figure 5 It is a structural diagram of the casting.
[0020] In the figure, the corresponding relationship between component names and reference numerals is as follows:
[0021] 11. Mold frame; 12. Extrusion through hole; 21. Extrusion cylinder; 22. Mold core; 23. Casting; 24. Extrusion cylinder mounting plate; 25. Connecting rod; 26. Casting mouth; 27. Mounting hole; 31. Press sleeve; 32. Connecting plate; 33. Connecting hole; 34. Extrusion pin sleeve; 35. Fixing sleeve; 36. Extrusion pin; 37. Extrusion hole; 38. Limiting protrusion; 39. Fixing rod. DETAILED DESCRIPTION
[0022] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following embodiments are used to illustrate the technical solution of the present invention, but are not intended to limit the scope of protection of the present invention.
[0023] Example:
[0024] like Figures 1 to 5As shown, the utility model provides a syringe-type die-casting die extrusion pin structure, including a mold frame 11 and an extrusion cylinder 21. The mold frame 11 serves as a basic structural component, and an extrusion through-hole 12 is provided on the mold frame 11. The extrusion through-hole 12 provides a channel for installation and operation of the extrusion assembly. The extrusion assembly inserted into the extrusion through-hole 12 is a key part for realizing the operation of the casting 23. On one side of the mold frame 11, a mold core 22 is provided. One end of the extrusion assembly is inserted into the mold core 22, and one end of the mold core 22 is clamped on the casting 23, so that the extrusion assembly can directly contact the casting 23, providing a direct action path for subsequent die-casting operations. The extrusion cylinder 21 is located on one side of the mold frame 11 and is firmly mounted on the extrusion cylinder mounting plate 24. A connecting rod 25 is provided between the extrusion cylinder 21 and the mold frame 11, and the two ends of the connecting rod 25 are respectively connected to the extrusion cylinder 21 and the extrusion assembly. The extrusion cylinder 21 can transmit power to the extrusion assembly through the connecting rod 25, thereby realizing a series of operations on the casting 23. For example, during the die-casting process, when encountering situations such as large local wall thickness or uneven cooling, the extrusion cylinder 21 can push the extrusion assembly through the connecting rod 25, and apply pressure to the parts of the casting 23 that need shrinkage compensation in time, ensuring the smooth progress of the die-casting process and improving the quality of the casting 23.
[0025] The extrusion assembly includes a pressing sleeve 31, which is cylindrical in shape. The diameter of the pressing sleeve 31 is smaller than the extrusion through-hole 12. One end of the pressing sleeve 31 is inserted into the extrusion through-hole 12, and at the other end of the pressing sleeve 31, a connecting plate 32 is provided. The diameter of the connecting plate 32 is larger than the extrusion through-hole 12 and is located on one side of the mold core 22. The connecting plate 32 and the mold frame 11 are both provided with multiple groups of connecting holes 33, and the connecting screws are inserted into these connecting holes 33, thereby realizing a detachable connection between the pressing sleeve 31 and the mold frame 11, which not only facilitates subsequent maintenance and replacement, but also provides convenience for the assembly and debugging of the entire device. An extrusion pin sleeve 34 is also provided on one side of the mold frame 11. It is inserted into the mold core 22 and cooperates with the pressing sleeve 31. After one end of the pressing sleeve 31 contacts the extrusion pin sleeve 34, a syringe-type structure is formed, which is conducive to more precise and stable operation during the die-casting process. When the extrusion cylinder 21 is working, the pressure can be transferred to the casting 23 more evenly through the syringe-type structure, thereby further improving the shrinkage compensation effect and the quality of the casting 23.
[0026] like Figure 2 、 Figure 4As shown, the extrusion assembly also includes a fixing sleeve 35 and an extrusion pin 36. The fixing sleeve 35 is inserted into the pressing sleeve 31 and has an exit hole 37 at one end. The extrusion pin 36 is inserted into the exit hole 37, the pressing sleeve 31, and the extrusion pin outer sleeve 34. A limiting protrusion 38 is provided at one end of the extrusion pin 36. The limiting protrusion 38 is located in the fixing sleeve 35 and has a diameter larger than the exit hole 37. It can effectively prevent excessive displacement of the extrusion pin 36 during operation and ensure that it functions in the correct position.
[0027] At the same time, one end of the connecting rod 25 is inserted into the fixing sleeve 35, and a fixing rod 39 is also provided in the fixing sleeve 35. The fixing rod 39 is located between the connecting rod 25 and the extrusion pin 36. The two ends of the fixing rod 39 are respectively in contact with the connecting rod 25 and the extrusion pin 36. The extrusion pin 36, the fixing sleeve 35, the fixing rod 39 and the connecting rod 25 form a needle structure, which can accurately transmit the power of the extrusion cylinder 21 to the extrusion pin 36, so that the extrusion pin 36 can apply pressure to the casting 23. Whether in the shrinkage feeding operation or in other die-casting process links, it can play an efficient and stable role, thereby ensuring the smooth progress of the entire die-casting process and the reliability of the quality of the casting 23.
[0028] like Figure 2 、 Figure 5 As shown, a casting port 26 is provided on the casting 23. This port 26 is secured to one end of the die core 22 and cooperates with the die core 22 to ensure that the liquid metal accurately flows into the corresponding molding area during the die-casting process. An extrusion pin 36 passes through an extrusion pin housing 34 and is secured within the casting port 26. When the extrusion cylinder 21 drives the extrusion assembly, the extrusion pin 36, through contact with the casting port 26, directly applies pressure to the liquid metal within the casting 23. This effectively compensates for potential shrinkage cavities and porosity during the solidification process of the casting 23, ensuring the density and quality stability of the internal structure of the casting 23.
[0029] Both the extrusion cylinder 21 and the extrusion cylinder mounting plate 24 have multiple mounting holes, and mounting bolts are inserted into the holes, enabling a removable connection between the extrusion cylinder 21 and the extrusion cylinder mounting plate 24. This facilitates maintenance, replacement, and commissioning of the equipment. If the extrusion cylinder 21 malfunctions or requires maintenance, it can be easily removed from the extrusion cylinder mounting plate 24 for repair without extensive disassembly of the entire equipment, saving time and cost. Furthermore, multiple mounting holes 27 are provided on either side of the extrusion cylinder mounting plate 24 to secure the mounting plate in place, ensuring that the extrusion cylinder 21 maintains a stable position and state during operation. By properly positioning the mounting holes 27 and using appropriate fasteners, the extrusion cylinder mounting plate 24 can be securely attached to the equipment frame or other supporting structure, providing a solid foundation for the proper operation of the extrusion cylinder 21 and ensuring the reliability and stability of the entire die-casting die extrusion pin structure during operation, thereby improving the efficiency and quality of die-casting production.
[0030] The specific usage and function of this embodiment are as follows:
[0031] During use, after liquid metal is injected into the mold cavity, the extrusion cylinder 21 is activated according to the design requirements and actual die-casting conditions of the casting 23. The extrusion cylinder 21 pushes the extrusion assembly through the connecting rod 25, causing the extrusion pin 36 to pass through the extrusion pin sleeve 34 and move into the casting port 26, applying pressure to the liquid metal inside the casting 23. During the die-casting process, close attention is paid to the molding of the casting 23, especially when encountering areas with large wall thickness or uneven cooling. By controlling the pressure and stroke of the extrusion cylinder 21, the force and time of the extrusion pin 36 are adjusted in a timely manner to ensure that sufficient pressure is applied to the areas requiring shrinkage compensation, forcing the liquid metal into areas that have not yet fully solidified, thereby reducing the possibility of shrinkage cavities and shrinkage porosity. Various parameters in the die-casting process, such as pressure, temperature, and time, are continuously monitored to ensure that the die-casting process is carried out within the specified process range. When the casting 23 is fully solidified, the casting 23 is removed from the mold according to the die-casting equipment's demolding procedures.
[0032] The basic principles, main features and advantages of the present invention are shown and described above. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments.
Claims
1. A needle-type die-casting die extrusion pin structure, comprising a die frame (11) and an extrusion cylinder (21), characterized in that: An extrusion through hole (12) is provided on the mold frame (11), an extrusion assembly is passed through the extrusion through hole (12), a mold core (22) is provided on one side of the mold frame (11), one end of the extrusion assembly is passed through the mold core (22), one end of the mold core (22) is clamped on the casting (23), and one end of the extrusion assembly passes through the mold core (22) and contacts the casting (23); the extrusion cylinder (21) is located on one side of the mold frame (11) and is installed on an extrusion cylinder mounting plate (24), a connecting rod (25) is provided between the extrusion cylinder (21) and the mold frame (11), and two ends of the connecting rod (25) are respectively connected to the extrusion cylinder (21) and the extrusion assembly.
2. The needle-type die-casting die extrusion pin structure according to claim 1, characterized in that: The extrusion assembly includes a pressing sleeve (31), which is cylindrical and has a diameter smaller than the extrusion through hole (12). One end of the pressing sleeve (31) is inserted into the extrusion through hole (12). A connecting plate (32) is provided at one end of the pressing sleeve (31). The connecting plate (32) has a diameter larger than the extrusion through hole (12) and is located on one side of the mold core (22). Multiple groups of connecting holes (33) are provided on the connecting plate (32) and the mold frame (11). Connecting screws are inserted into the connecting holes (33). The pressing sleeve (31) and the mold frame (11) are detachably connected.
3. The needle-type die-casting die extrusion pin structure according to claim 2, characterized in that: An extrusion pin sleeve (34) is provided on one side of the mold frame (11), and the extrusion pin sleeve (34) is inserted into the mold core (22). One end of the pressing sleeve (31) contacts the extrusion pin sleeve (34) to form a syringe-type structure.
4. The needle-type die-casting die extrusion pin structure according to claim 3, characterized in that: The extrusion assembly further comprises a fixing sleeve (35) and an extrusion pin (36). The fixing sleeve (35) is inserted into the pressing sleeve (31). An outlet hole (37) is provided at one end of the fixing sleeve (35). The extrusion pin (36) is inserted into the outlet hole (37), the pressing sleeve (31) and the extrusion pin outer sleeve (34). A limiting protrusion (38) is provided at one end of the extrusion pin (36). The limiting protrusion (38) is located in the fixing sleeve (35). The diameter of the limiting protrusion (38) is larger than the diameter of the outlet hole (37).
5. The needle-type die-casting die extrusion pin structure according to claim 4, characterized in that: One end of the connecting rod (25) is inserted into the fixing sleeve (35), and a fixing rod (39) is provided in the fixing sleeve (35). The fixing rod (39) is located between the connecting rod (25) and the extrusion pin (36). Two ends of the fixing rod (39) are in contact with the connecting rod (25) and the extrusion pin (36) respectively, and a needle structure is formed by the extrusion pin (36), the fixing sleeve (35), the fixing rod (39) and the connecting rod (25).
6. The needle-type die-casting die extrusion pin structure according to claim 4, characterized in that: The casting (23) is provided with a casting opening (26), the casting opening (26) is clamped at one end of the mold core (22), and the extrusion pin (36) passes through the extrusion pin sleeve (34) and is clamped in the casting opening (26).
7. The needle-type die-casting die extrusion pin structure according to claim 1, characterized in that: The extrusion oil cylinder (21) and the extrusion oil cylinder mounting plate (24) are both provided with a plurality of assembly holes, and the assembly bolts are passed through the assembly holes. The extrusion oil cylinder (21) and the extrusion oil cylinder mounting plate (24) are detachably connected, and a plurality of installation holes (27) are further provided on both sides of the extrusion oil cylinder mounting plate (24).