Core-pulling avoiding device for die-casting die

Abstract

The utility model discloses a die-casting mould core-pulling avoiding device, which relates to the technical field of die-casting core-pulling, and comprises a mounting sleeve, an oil cylinder and a driving rod, the mounting sleeve is inserted in a mould frame, the driving rod is connected in the mounting sleeve in a sliding manner, a sprue bush is arranged in the mould frame, the mounting sleeve is provided with a first avoiding groove, the peripheral wall of the sprue bush is propped against the inner wall of the first avoiding groove, and the oil cylinder is arranged in the mounting sleeve. And the distance between the axis of the sprue bush and the axis of the mounting sleeve is shortened, so that the centrosymmetric layout of the sprue bush is kept. The driving rod is provided with a second avoiding groove, and the length of the second avoiding groove is larger than that of the first avoiding groove in the axis direction of the driving rod, so that the driving rod can move in the axis direction of the driving rod to achieve the core pulling process, and interference is avoided. And meanwhile, a first matching surface is arranged on the inner wall of the mounting sleeve, and a second matching surface abutting against the first matching surface is arranged on the outer wall of the driving rod, so that circumferential positioning of the driving rod is achieved, the second receding groove is located in the peripheral position of the sprue bush, and the driving rod is prevented from rotating.

Description

A die casting mold core pulling and avoidance device Technical Field

[0001] This utility model relates to the field of die casting core pulling technology, and in particular to a die casting mold core pulling avoidance device. Background Technology

[0002] In die-casting mold design, the spatial interference between the hole features of the casting and the core-pulling mechanism and sprue bushing has long been a problem. Traditional solutions typically involve offsetting the sprue bushing position to achieve spatial avoidance, but this method disrupts the symmetrical layout of the gating system, causing a difference in the flow path and filling pressure of the molten metal within the cavity. This unbalanced pouring state results in inconsistent cooling rates on both sides of the casting during solidification, ultimately leading to significant deviations in key quality indicators such as dimensional stability and mechanical properties, severely restricting the batch production yield of precision die-cast parts. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a die-casting mold core-pulling and avoidance device that achieves core pulling while maintaining the centrally symmetrical layout of the sprue bushing, thus ensuring the quality of the casting.

[0004] A die-casting mold core-pulling and avoidance device according to an embodiment of the present utility model is installed on the mold frame and includes:

[0005] The mounting sleeve, hydraulic cylinder, and drive rod are installed. The mounting sleeve is inserted into the mold frame, the hydraulic cylinder is fixedly installed on the outer side wall of the mold frame, and the drive rod is slidably connected to the mounting sleeve. The mold frame has a sprue sleeve. The mounting sleeve has a first clearance groove, and the outer peripheral wall of the sprue sleeve abuts against the inner wall of the first clearance groove. The drive rod has a second clearance groove. Along the axial direction of the drive rod, the length of the second clearance groove is greater than the length of the first clearance groove. The inner wall of the mounting sleeve has a first mating surface, and the outer wall of the drive rod has a second mating surface that abuts against the first mating surface, so as to achieve circumferential positioning of the drive rod.

[0006] According to an embodiment of the present invention, a die-casting mold core-pulling and avoidance device has at least the following beneficial effects: This embodiment includes an mounting sleeve, a hydraulic cylinder, and a drive rod. The mounting sleeve is inserted into the mold frame, the hydraulic cylinder is fixedly installed on the outer side wall of the mold frame, and the drive rod is slidably connected to the mounting sleeve. The mold frame has a sprue sleeve, and the mounting sleeve has a first avoidance groove. The outer peripheral wall of the sprue sleeve abuts against the inner wall of the first avoidance groove, thereby reducing the distance between the axis of the sprue sleeve and the axis of the mounting sleeve, thus maintaining the symmetrical layout of the sprue sleeve relative to the workpiece. The drive rod has a second avoidance groove. Along the axial direction of the drive rod, the length of the second avoidance groove is greater than the length of the first avoidance groove, thereby enabling the drive rod to move along its axial direction to achieve the core-pulling process and avoid interference. Simultaneously, the inner wall of the mounting sleeve has a first mating surface, and the outer wall of the drive rod has a second mating surface that abuts against the first mating surface, thereby achieving circumferential positioning of the drive rod and positioning the second avoidance groove at the outer peripheral position of the sprue sleeve, preventing the drive rod from rotating and causing interference.

[0007] According to some embodiments of the present invention, the second clearance groove includes a first wall surface, a second wall surface, and a third wall surface arranged sequentially along the axis of the drive rod. The first wall surface and the second wall surface are both arc-shaped surfaces and are located at both ends of the third wall surface.

[0008] According to some embodiments of the present invention, a template is provided on one side of the mold frame, and a core-pulling rod is provided at the end of the drive rod. The core-pulling rod is slidably inserted into the template. The template is provided with a first guide sleeve, and the inner wall of the first guide sleeve covers the outer periphery of the core-pulling rod.

[0009] According to some embodiments of the present invention, the end of the drive rod is provided with a core-pulling rod, the core-pulling rod has a liquid cooling channel, the liquid cooling channel is provided with a cooling pipe, the inner peripheral wall of the liquid cooling channel and the outer peripheral wall of the cooling pipe have a gap, and the cooling pipe is used to inject coolant into the liquid cooling channel.

[0010] According to some embodiments of this utility model, the drive rod is provided with an inlet channel and an outlet channel, the inlet channel is connected to the cooling pipe, and the outlet channel is connected to the liquid cooling channel.

[0011] According to some embodiments of this utility model, a sealing sleeve is provided between the core-pulling rod and the drive rod, and the sealing sleeve enables the water outlet channel and the liquid cooling channel to be connected.

[0012] According to some embodiments of the present invention, a connecting rod is provided between the drive rod and the oil cylinder, and the connecting rod is screwed to the end of the drive rod.

[0013] According to some embodiments of the present invention, the drive rod has a process channel that runs through both ends of the drive rod. The process channel has a connecting cavity at the end opposite to the connecting rod, and the connecting cavity is used to connect the water inlet channel with the cooling pipe.

[0014] According to some embodiments of the present invention, the maximum depth S of the second clearance groove along the radial direction of the drive rod and the minimum diameter D of the drive rod satisfy the following condition: 0.7≤S / D≤0.75.

[0015] According to some embodiments of the present invention, a positioning rod is connected to one end of the drive rod facing the oil cylinder, a limit switch is provided on one side of the oil cylinder, and the positioning rod has a contact that can press the limit switch.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 is a first cross-sectional view of a die-casting mold core-pulling and avoidance device in an embodiment of the present invention;

[0019] Figure 2 is an enlarged view of A in Figure 1;

[0020] Figure 3 is a second cross-sectional view of a die-casting mold core-pulling and avoidance device in an embodiment of the present invention;

[0021] Figure 4 is an enlarged view of B in Figure 3;

[0022] Figure 5 is an isometric view of the drive rod in an embodiment of this utility model;

[0023] Figure 6 is a cross-sectional view of the drive rod in an embodiment of this utility model;

[0024] Figure 7 is a partial view of the mounting base and hydraulic cylinder in an embodiment of this utility model.

[0025] Figure label:

[0026] Mold frame 100; template 101; sprue sleeve 102; hydraulic cylinder 103; mounting base 104; first guide sleeve 105;

[0027] Mounting sleeve 110; First clearance groove 111; Drive rod 112; Second clearance groove 113; Core pulling rod 114; Step 1141; First mating surface 115; Second mating surface 116; First wall surface 117; Second wall surface 118; Third wall surface 119; Liquid cooling channel 120; Point cooling pipe 121; Water inlet channel 122; Water outlet channel 123; Sealing sleeve 124; Process channel 125; Connecting cavity 126; Connecting rod 127; Positioning rod 128; Contact 129; Limit switch 130; Mounting block 131; Mounting rod 132. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0032] Referring to Figures 1 to 3, in an embodiment of this utility model, a die-casting mold core-pulling and avoidance device is installed on a mold frame 100. It is understood that a template 101 is installed on the mold frame 100, and the template 101 has a forming cavity for forming a workpiece. The die-casting mold core-pulling and avoidance device includes a mounting sleeve 110, a hydraulic cylinder 103, and a drive rod 112. The mounting sleeve 110 is inserted into the mold frame 100, and the drive rod 112 is slidably connected to the mounting sleeve 110. A core-pulling rod 114 is provided at the end of the drive rod 112, and the core-pulling rod 114 is slidably inserted into the template 101. The drive rod 112 can drive the core-pulling rod 114 to insert into the forming cavity to perform core-pulling forming of the workpiece. Furthermore, the template 101 is provided with a first guide sleeve 105. The inner wall of the first guide sleeve 105 covers the outer periphery of the core-pulling rod 114, which can avoid direct friction between the core-pulling rod 114 and the template 101, reduce wear and movement resistance, and at the same time, can achieve a seal between the core-pulling rod 114 and the template 101 to prevent air or liquid leakage.

[0033] Understandably, the hydraulic cylinder 103 is mounted on the outer wall of the mold frame 100 via the mounting base 104. A connecting rod 127 is provided at the end of the drive rod 112 facing away from the core-pulling rod 114. The other end of the connecting rod 127 is connected to the piston rod of the hydraulic cylinder 103. Therefore, the hydraulic cylinder 103 can drive the drive rod 112 to extend and retract within the mounting sleeve 110. Furthermore, the connecting rod 127 is screwed onto the end of the drive rod 112, and the connecting rod 127 and the drive rod 112 are connected by a thread, facilitating easy installation. Further, referring to Figure 7, two limit switches 130 are mounted on the mounting base 104. A positioning rod 128 is connected to the end of the drive rod 112 facing the hydraulic cylinder 103. The positioning rod 128 has a contact 129 capable of pressing the limit switch 130. Understandably, when the drive rod 112 moves, it can drive the positioning rod 128 to move. The contact 129 on the positioning rod 128 can press the limit switch 130. When a limit switch 130 is pressed, it means that the drive rod 112 has moved to a preset position, thereby stopping the cylinder 103 from operating, to ensure that the drive rod 112 moves within the preset stroke. Furthermore, there is a mounting rod 132 connecting the end of the drive rod 112 and the positioning rod 128, and the mounting rod 132 extends radially along the drive rod 112.

[0034] Understandably, the mold base 100 contains a sprue sleeve 102, and the mounting sleeve 110 is provided with a first clearance groove 111. The outer peripheral wall of the sprue sleeve 102 abuts against the inner wall of the first clearance groove 111. The drive rod 112 is provided with a second clearance groove 113. The second clearance groove 113 ensures that the distance between the axis of the sprue sleeve 102 and the axis of the drive rod 112 is less than the sum of their radii, thereby allowing the drive rod 112 to avoid the sprue sleeve 102. This ensures that the sprue sleeve 102 is centrally symmetrically arranged relative to the workpiece, allowing the drive rod 112 to move along its axial direction to achieve the core-pulling process, and avoiding interference between the drive rod 112 and the sprue sleeve 102. Furthermore, along the axial direction of the drive rod 112, the length of the second clearance groove 113 is greater than the length of the first clearance groove 111, enabling the drive rod 112 to move along its axial direction to achieve the core-pulling function.

[0035] Referring to Figures 3 and 4, it can be understood that the inner wall of the mounting sleeve 110 is provided with a first mating surface 115, and the outer wall of the drive rod 112 is provided with a second mating surface 116 that abuts against the first mating surface 115, so as to achieve circumferential positioning of the drive rod 112 and avoid interference caused by rotation of the drive rod 112. Further, the end of the drive rod 112 away from the oil cylinder 103 is provided with a mounting block 131, which is detachably fixed to the drive rod 112. The end of the core-pulling rod 114 has a step 1141 extending radially outward. When the mounting block 131 is installed at the end of the drive rod 112, it can press against the step 1141 and keep the core-pulling rod 114 and the drive rod 112 fixedly connected, thus realizing the installation of the core-pulling rod 114 on the drive rod 112.

[0036] Referring to Figure 5, the second clearance groove 113 includes a first wall surface 117, a second wall surface 118, and a third wall surface 119 arranged sequentially along the axis of the drive rod 112. The first wall surface 117 and the second wall surface 118 are located at both ends of the third wall surface 119. It can be understood that the first wall surface 117 is located at one end of the drive rod 112 near the hydraulic cylinder 103, and the third wall surface 119 is located at the other end of the drive rod 112. Since the sprue sleeve 102 is cylindrical, the minimum inner diameter of the first wall surface 117 and the second wall surface 118 is greater than the maximum outer diameter of the sprue sleeve 102, thereby preventing interference between the drive rod 112 and the sprue sleeve 102 when the drive rod 112 moves. Furthermore, both the first wall surface 117 and the second wall surface 118 are arc-shaped surfaces, which can reduce stress concentration in the drive rod 112 during transmission, ensure that the drive rod 112 has good structural strength, thereby ensuring the stability and accuracy of the core pulling action, and can reduce the amount of material removed when opening the second clearance groove 113 on the drive rod 112, saving processing time while ensuring that the drive rod 112 has good structural strength.

[0037] Referring to Figure 6, it can be understood that the maximum depth S of the second clearance groove 113 along the radial direction of the drive rod 112 and the minimum diameter D of the drive rod 112 satisfy the following condition: 0.7 ≤ S / D ≤ 0.75. It can also be understood that the maximum depth S of the second clearance groove 113 along the radial direction of the drive rod 112 is the sum of the distance between the second wall surface 118 and the central axis of the drive rod 112 and the radius of the drive rod 112.

[0038] Understandably, when S / D < 0.7, the maximum depth S of the second clearance groove 113 along the radial direction of the drive rod 112 is small, meaning the depth of the second clearance groove 113 is insufficient. This makes it easy for the drive rod 112 to interfere with the sprue bushing 102, or for the sprue bushing 102 to be not centered, thus leading to a decrease in the mechanical properties of the workpiece. When S / D > 0.75, the maximum depth S of the second clearance groove 113 along the radial direction of the drive rod 112 is large, meaning the depth of the second clearance groove 113 is too large. This would cause the strength of the drive rod 112 to be excessively weakened, and the drive rod 112 would be prone to deformation during transmission, resulting in insufficient precision and durability of the core-pulling action. Therefore, only when the maximum depth S of the second clearance groove 113 along the radial direction of the drive rod 112 and the minimum diameter D of the drive rod 112 satisfy the condition that 0.7≤S / D≤0.75, can the drive rod 112 be ensured to have good structural strength while ensuring that the sprue sleeve 102 is centered, thereby ensuring that the molded workpiece has good mechanical properties.

[0039] Referring to Figures 1 and 2, the core-pulling rod 114 has a liquid cooling channel 120, and a cooling pipe 121 is provided in the liquid cooling channel 120. There is a gap between the inner peripheral wall of the liquid cooling channel 120 and the outer peripheral wall of the cooling pipe 121. The cooling pipe 121 is used to inject coolant into the liquid cooling channel 120. At the same time, the coolant can flow back and be discharged from the gap between the inner peripheral wall of the liquid cooling channel 120 and the outer peripheral wall of the cooling pipe 121, so as to realize the circulating cooling function of the core-pulling rod 114, which is beneficial to the cooling during casting.

[0040] Accordingly, the drive rod 112 is provided with an inlet channel 122 and an outlet channel 123. The inlet channel 122 connects to the cooling pipe 121, and the outlet channel 123 connects to the liquid cooling channel 120. Further, the drive rod 112 is provided with a connecting cavity 126, located at the end of the cooling pipe 121 and connected to it. Simultaneously, the connecting cavity 126 connects to the inlet channel 122, allowing coolant to enter the cooling pipe 121 from the inlet channel 122 through the connecting cavity 126. It is understood that a sealing sleeve 124 is provided between the drive rod 112 and the core-pulling rod 114, and between the core-pulling rod 114 and the drive rod 112. The sealing sleeve 124 ensures a good seal between the drive rod 112 and the core-pulling rod 114, preventing leakage. Further, the side wall of the sealing sleeve 124 is provided with a connecting hole, which connects the outlet channel 123 and the liquid cooling channel 120, achieving a drainage function.

[0041] Referring to Figures 2 and 3, it can be understood that the drive rod 112 has a process channel 125, which extends through both ends of the drive rod 112, and the connecting cavity 126 is located at the end of the process channel 125 opposite to the connecting rod 127. It can be understood that, on the one hand, the process channel 125 is used to form the threaded hole connecting the drive rod 112 and the connecting rod 127; on the other hand, the process channel 125 is used to form the connecting cavity 126, which helps to simplify the process, improve processing efficiency, and reduce processing costs.

[0042] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A die-casting mold core-pulling and clearance device, installed on the mold frame, characterized in that, include: The assembly comprises a mounting sleeve, a hydraulic cylinder, and a drive rod. The mounting sleeve is inserted into the mold frame, the hydraulic cylinder is fixedly mounted on the outer side wall of the mold frame, and the drive rod is slidably connected to the mounting sleeve. The mold frame has a sprue sleeve. The mounting sleeve has a first clearance groove, and the outer peripheral wall of the sprue sleeve abuts against the inner wall of the first clearance groove. The drive rod has a second clearance groove, and along the axial direction of the drive rod, the length of the second clearance groove is greater than the length of the first clearance groove. The inner wall of the mounting sleeve has a first mating surface, and the outer wall of the drive rod has a second mating surface that abuts against the first mating surface, thereby achieving circumferential positioning of the drive rod.

2. The die-casting mold core-pulling and avoidance device according to claim 1, characterized in that, The second clearance groove includes a first wall, a second wall, and a third wall arranged sequentially along the axis of the drive rod. The first and second walls are both arc-shaped surfaces and are located at both ends of the third wall.

3. The die-casting mold core-pulling and avoidance device according to claim 1, characterized in that, A template is provided on one side of the mold frame, and a core-pulling rod is provided at the end of the drive rod. The core-pulling rod is slidably inserted into the template. The template is provided with a first guide sleeve, and the inner wall of the first guide sleeve covers the outer periphery of the core-pulling rod.

4. The die-casting mold core-pulling and avoidance device according to claim 1, characterized in that, The end of the drive rod is provided with a core-pulling rod, the core-pulling rod has a liquid cooling channel, the liquid cooling channel is provided with a cooling pipe, the inner peripheral wall of the liquid cooling channel and the outer peripheral wall of the cooling pipe have a gap, and the cooling pipe is used to inject coolant into the liquid cooling channel.

5. The die-casting mold core-pulling and avoidance device according to claim 4, characterized in that, The drive rod is provided with an inlet channel and an outlet channel. The inlet channel is connected to the ignition pipe, and the outlet channel is connected to the liquid cooling channel.

6. The die-casting mold core-pulling and avoidance device according to claim 5, characterized in that, A sealing sleeve is provided between the core-pulling rod and the drive rod, and the sealing sleeve enables the water outlet channel and the liquid cooling channel to be connected.

7. The die-casting mold core-pulling and avoidance device according to claim 5, characterized in that, A connecting rod is provided between the drive rod and the oil cylinder, and the connecting rod is screwed to the end of the drive rod.

8. The die-casting mold core-pulling and avoidance device according to claim 7, characterized in that, The drive rod has a process channel that runs through both ends of the drive rod. The end of the process channel away from the connecting rod has a connecting cavity for connecting the water inlet channel to the cooling pipe.

9. A die-casting mold core-pulling and avoidance device according to claim 7, characterized in that, The maximum depth S of the second clearance groove along the radial direction of the drive rod and the minimum diameter D of the drive rod satisfy the following condition: 0.7 ≤ S / D ≤ 0.

75.

10. A die-casting mold core-pulling and avoidance device according to claim 1, characterized in that, The drive rod is connected to a positioning rod at one end facing the cylinder. A limit switch is provided on one side of the cylinder. The positioning rod has a contact that can press the limit switch.

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