Extrusion mechanism and disassembly and assembly method of extrusion mechanism

Abstract

The extrusion mechanism comprises an extrusion sleeve, an extrusion pin, a transmission rod, a quick-change ejector rod and an extrusion driving oil cylinder, the extrusion pin slidably penetrates through the extrusion sleeve along the axis of the extrusion sleeve, and a stepped hole is formed in the quick-change ejector rod in a penetrating mode along the axis of the quick-change ejector rod; the stepped hole comprises a first hole in sliding fit with the extrusion pin and a second hole in sliding fit with the transmission rod, the extrusion driving oil cylinder is in driving connection with the transmission rod, and the transmission rod is in transmission connection with the extrusion pin. Upward jacking force is provided for the extrusion sleeve through the quick ejector rod and the extrusion driving oil cylinder, so that the extrusion sleeve, the quick-change ejector rod and the extrusion driving oil cylinder sequentially abut against one another from top to bottom to be fixed, the extrusion sleeve and the quick-change ejector rod are axially positioned, and installation is convenient and fast; when the extrusion mechanism needs to be disassembled, locking of the extrusion driving oil cylinder is released, the extrusion sleeve and the quick-change ejector rod slide downwards to be separated from the multi-stage hole under the action of gravity, and the extrusion sleeve can be disassembled very quickly.

Description

[0001] This application is a divisional application of the patent application with patent application number "202310928929.X", application date "July 26, 2023", and name "Die-casting mold for integrated rear frame". Technical Field

[0002] The invention relates to the field of automobile parts manufacturing, in particular to a die-casting mold for an integrated rear frame. Background Art

[0003] The rear frame is a supporting structure that connects the wheels, suspension system and body, and plays the role of bearing and transmitting the vehicle load. Due to the complex structure of the rear frame, it is usually processed and formed by die-casting molds. In order to reduce possible defects such as pores and shrinkage and obtain high-quality die-cast parts, the role of the extrusion mechanism in the die-casting mold is to force the molten metal material into the mold cavity by applying a certain force and pressure, and form the required part shape. The extrusion mechanism can provide sufficient pressure to ensure that the metal fully fills the mold cavity.

[0004] The extrusion mechanism mainly includes an extrusion pin extending into the mold cavity, an extrusion sleeve fixed on the core pulling block and matched with the extrusion pin, and a driving mechanism for driving the extrusion pin to move. The extrusion sleeve plays the functions of guiding, buffering and sealing in the extrusion mechanism of the die-casting mold to ensure the smooth progress of the extrusion process. However, the extrusion sleeve is mainly fixed on the core pulling block by threaded matching, that is, a threaded hole matching the extrusion sleeve is opened on the core pulling block, and an external thread matching the threaded hole is set on the outer wall of the extrusion sleeve, and then the extrusion sleeve is inserted into the threaded hole, the position is adjusted by rotation, and the extrusion sleeve is fixed on the core pulling block by threaded fastening or other locking structures. When the angle and position of the extrusion mechanism are relatively special, the threaded hole must be opened deep inside the core pulling block or the moving mold core, and it is difficult to tap the threaded hole; in addition, when the extrusion sleeve needs to be maintained and replaced due to wear, it is necessary to use special tools to screw out the extrusion sleeve, which is difficult to operate, time-consuming and labor-intensive, and affects the maintenance efficiency.

[0005] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a die-casting mold for an integrated rear frame, so as to facilitate the installation and disassembly of an extrusion mechanism.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] The die-casting mold of the integrated rear frame comprises a movable mold frame, a fixed mold frame, a movable mold core arranged on the movable mold frame, a fixed mold core arranged on the fixed mold frame, a first lateral core-pulling mechanism for core-pulling molding of the side portion of the rear frame, a second lateral core-pulling mechanism, and two top core-pulling mechanisms for core-pulling molding of the top portion of the rear frame; the first lateral core-pulling mechanism and the second lateral core-pulling mechanism each comprise a slider slidably connected to the movable mold frame, a core-pulling block fixedly connected to one side of the slider, a mounting plate fixedly connected to the other side of the slider, and a core-pulling driving cylinder arranged on the mounting plate and drivingly connected to the side of the movable mold frame; the fixed mold core, the movable mold core, the core-pulling blocks of the first core-pulling slide and the second core-pulling slide, and the top core-pulling mechanism are combined to form a mold cavity; the casting port is arranged on the fixed mold core; the first lateral core-pulling mechanism and / or the second lateral core-pulling mechanism are arranged on the fixed mold core; The lateral core pulling mechanism is provided with a plurality of inclined extrusion mechanisms, which include an extrusion sleeve, an extrusion pin, a transmission rod, a quick-change ejector rod and an extrusion drive cylinder. The slider and the core pulling block are connected to form a three-level hole matching the shape of the extrusion sleeve and the quick-change ejector rod. The extrusion pin slides through the extrusion sleeve along the axis of the extrusion sleeve, and the quick-change ejector rod is penetrated by a stepped hole along its axis. The stepped hole includes a first hole that slides with the extrusion pin and a second hole that slides with the transmission rod. The extrusion drive cylinder is drivingly connected to the transmission rod, and the transmission rod is drivingly connected to the extrusion pin. The end of the quick-change ejector rod with the first hole is used to support the tail of the extrusion sleeve upward, and the end of the quick-change ejector rod with the second hole is supported upward by the extrusion drive cylinder, and the extrusion drive cylinder is fixed on the slider.

[0009] As a further improvement of the above technical solution, the extrusion mechanism also includes a fixed lock head, and the fixed lock head is provided with a mounting hole and a threaded hole in sequence along its axis, and the aperture of the mounting hole is smaller than the aperture of the threaded hole; the extrusion pin includes a pin shaft body and a limiting protrusion arranged at one end of the pin shaft body, the pin shaft body cooperates with the mounting hole, the limiting protrusion is located in the threaded hole, and a threaded column is provided at one end of the transmission rod, and the threaded column cooperates with the threaded hole of the fixed lock head and presses the limiting protrusion upward.

[0010] As a further improvement of the above technical solution, a positioning step is provided at the tail of the extrusion sleeve, and the inner hole in the extrusion sleeve includes a first axial hole and a second axial hole connected to each other, the first axial hole is located at the head of the extrusion sleeve and is slidably connected to the extrusion pin, and an avoidance gap is formed between the second axial hole and the extrusion shaft.

[0011] As a further improvement of the above technical solution, the movable mold frame is provided with a lower guide rail slidably connected to the bottom of the slider and an upper guide rail slidably connected to the top of the slider, a support plate fixed to the movable mold is provided below the mounting plate, a wear-resistant pad is laid on the top of the support plate, a wear-resistant block is provided at the bottom of the mounting plate, and the wear-resistant pad is slidably connected to the wear-resistant block.

[0012] As a further improvement of the above technical solution, the wear-resistant pads are provided with two pieces, the two wear-resistant pads are separated by a guide strip, and the number of the wear-resistant blocks is the same as that of the wear-resistant pads and they correspond one to one.

[0013] As a further improvement of the above technical solution, the support plate includes a flat plate portion, a vertical plate portion, and a plurality of reinforcing ribs for reinforcing the connection between the flat plate portion and the vertical plate portion, and the flat plate portion and the vertical plate portion are combined to form an L-shaped plate structure.

[0014] As a further improvement of the above technical solution, an adjusting pad is provided on the end surface of the mounting plate facing the movable mold frame.

[0015] As a further improvement of the above technical solution, a first concave cavity is opened on the end surface of the slider facing the core pulling block, an ejection panel is provided in the first concave cavity, a plurality of ejector rods passing through the core pulling block and facing the mold cavity are provided on the ejection panel, an ejection cylinder is provided on the mounting plate, and the ejection cylinder is driven and connected to the ejection panel through a transmission connecting rod, and the transmission connecting rod passes through the slider.

[0016] As a further improvement of the above technical solution, a plurality of guide columns are provided on the end surface of the ejection panel facing the core pulling block, a second concave cavity matching the first concave cavity is opened on the end surface of the core pulling block facing the first concave cavity, and guide holes equal in number to the guide columns and matched one by one are fixed in the second concave cavity of the core pulling block.

[0017] Beneficial effects of the present invention: The die-casting mold of the rear frame provided by the present invention creatively transforms the extrusion mechanism, completely changing the traditional way of fixing the extrusion sleeve, and provides an upward tightening force for the extrusion sleeve through the quick ejector rod and the extrusion drive cylinder, so that the extrusion sleeve, the quick-change ejector rod, and the extrusion drive cylinder are fixed by abutting against each other from top to bottom in sequence, thereby axially positioning the extrusion sleeve and the quick-change ejector rod, which is convenient for installation, and solves the technical problems of the difficulty in assembling the extrusion sleeve and the need for tapping of the multi-stage holes to match the assembly of the extrusion sleeve. When the extrusion mechanism is to be disassembled, the lock of the extrusion drive cylinder is released, and the extrusion sleeve and the quick-change ejector rod slide downward and disengage from the multi-stage hole under the action of gravity, so that the extrusion sleeve can be removed very quickly, without the need for special tools to extend into the multi-stage hole to assist in disassembly and assembly, greatly improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional diagram of the die-casting mold for the rear frame provided by the present invention.

[0019] Figure 2 It is a three-dimensional diagram of the first lateral core pulling mechanism, the second lateral core pulling mechanism, the top core pulling mechanism and the movable mold core arranged on the movable mold frame.

[0020] Figure 3 The support plate supports the first lateral core pulling mechanism. Figure 1 .

[0021] Figure 4 for Figure 3 A partial enlarged view of area A.

[0022] Figure 5 It is a three-dimensional diagram of the extrusion mechanism.

[0023] Figure 6 This is an exploded diagram of the extrusion mechanism.

[0024] Figure 7 A cross-sectional view of the extrusion mechanism.

[0025] Figure 8 for Figure 7 A partial enlarged view of the middle L area.

[0026] Fig. 9 This is a schematic diagram of the first lateral core pulling mechanism and the second lateral core pulling mechanism being arranged on the movable mold frame, in which the slider and the core pulling block are hidden.

[0027] Fig.10 A three-dimensional view of an extrusion drive cylinder of an extrusion mechanism arranged on a slide.

[0028] Fig.11 The support plate supports the first lateral core pulling mechanism. Figure 2 .

[0029] Fig.12 Schematic diagram of the structure after the core-pulling ejection structure hides the mounting plate, slider and core-pulling block

[0030] Fig.13 It is a structural schematic diagram of the core pulling block.

[0031] Fig.14 It is a schematic diagram of the structure in which the ejection panel is arranged in the first concave cavity of the slider.

[0032] Description of the main component symbols: 11-movable mold frame, 12-fixed mold frame, 13-movable mold core, 21-first lateral core pulling mechanism, 22-second lateral core pulling mechanism, 23-slider, 24-core pulling block, 25-mounting plate, 26-core pulling drive cylinder, 3-extrusion mechanism, 31-extrusion sleeve, 311-positioning step, 312-first shaft hole, 313-second shaft hole, 314-avoidance gap, 32-extrusion pin, 321-pin shaft body, 322-limiting protrusion, 33-transmission rod, 331-threaded column, 34-quick change ejector rod, 341-step hole, 3411-first hole, 3412-second Two holes, 35-extrusion drive cylinder, 36-fixed lock, 361-mounting hole, 362-threaded hole, 441-lower guide rail, 442-upper guide rail, 451-adjusting pad, 47-support plate, 471-flat plate, 472-vertical plate, 473-reinforcement rib, 481-wear-resistant pad, 482-wear-resistant block, 483-guide strip, 541-first concave cavity, 542-second concave cavity, 543-guide column, 544-guide hole, 551-ejection panel, 552-ejection rod, 562-transmission connecting rod, 563-ejection cylinder, 57-stroke detection component, 6-top core pulling mechanism. DETAILED DESCRIPTION

[0033] The present invention provides a die-casting mold for an integrated rear frame. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the scope of protection of the present invention.

[0034] See also Figure 1-Figure 7The present invention provides a die-casting mold for an integrated rear frame, comprising a movable die frame 11, a fixed die frame 12, a movable die core 13 arranged on the movable die frame 11, a fixed die core arranged on the fixed die frame 12, a first lateral core-pulling mechanism 21 for core-pulling molding of the side portion of the rear frame, a second lateral core-pulling mechanism 22, and two top core-pulling mechanisms 6 for core-pulling molding of the top portion of the rear frame; the first lateral core-pulling mechanism 21 and the second lateral core-pulling mechanism 22 both include a slider 23 slidably connected to the movable die frame 11, and a slider 23 slidably connected to the movable die frame 11. A core pulling block 24 fixedly connected to one side of the slider 23, a mounting plate 25 fixedly connected to the other side of the slider 23, and a core pulling driving cylinder 26 arranged on the mounting plate 25 and connected to the side of the movable mold frame 11, the fixed mold core, the movable mold core 13, the core pulling block 24 of the first core pulling slide and the second core pulling slide, and the top core pulling mechanism 6 are combined to form a mold cavity, the casting port is arranged on the fixed mold core, and the first lateral core pulling mechanism 21 and / or the second lateral core pulling mechanism 22 are provided with a plurality of The extrusion mechanism 3 is tilted and arranged, and the extrusion mechanism 3 includes an extrusion sleeve 31, an extrusion pin 32, a transmission rod 33, a quick-change ejector rod 34 and an extrusion drive cylinder 35. The slider 23 and the core-pulling block 24 are connected to form a three-level hole that matches the shape of the extrusion sleeve 31 and the quick-change ejector rod 34. The extrusion pin 32 slides through the extrusion sleeve 31 along the axis of the extrusion sleeve 31. The quick-change ejector rod 34 is penetrated by a stepped hole 341 along its axis. The stepped hole 341 includes a first hole 3411 that slides with the extrusion pin 32 and a second hole 3412 that slides with the transmission rod 33. The extrusion drive cylinder 35 is drivingly connected to the transmission rod 33. The transmission rod 33 is drivingly connected to the extrusion pin 32. The end of the quick-change ejector rod 34 provided with the first hole 3411 is used to support the tail of the extrusion sleeve 31 upwards. The end of the quick-change ejector rod 34 provided with the second hole 3412 is supported upwards by the extrusion drive cylinder 35, and the extrusion drive cylinder 35 is fixed on the slider 23.

[0035] During installation, first connect the extrusion pin 32 and the head of the transmission rod 33, connect the tail of the transmission rod 33 to the output end of the extrusion drive cylinder 35, then put the extrusion pin 32 and the transmission rod 33 into the second hole 3412 of the quick-change push rod 34, the extrusion pin 32 slides out of the first hole 3411, the transmission rod 33 is also slidably connected with the second hole 3412 of the quick-change push rod 34, then put the extrusion sleeve 31 on the extrusion pin 32, at this time, the tail of the extrusion sleeve 31 is pressed against the head of the quick-change push rod 34, the extrusion mechanism 3 is assembled, and then put the extrusion mechanism 3 into the multi-stage hole (except the extrusion drive cylinder 35 (outside), since the total length of the multi-stage hole is equal to the length of the extrusion sleeve 31 plus the length of the quick-change ejector rod 34, when the extrusion sleeve 31 and the quick-change ejector rod 34 are installed and matched with the multi-stage hole, the extrusion drive cylinder 35 is locked on the slider 23, and the extrusion drive cylinder 35 pushes upward against the tail of the quick-change ejector rod 34, so that the extrusion sleeve 31, the quick-change ejector rod 34, and the extrusion drive cylinder 35 are abutted against each other from top to bottom to achieve fixation, thereby axially positioning the extrusion sleeve 31 and the quick-change ejector rod 34, which is convenient for installation, and solves the technical problem that the extrusion sleeve 31 is difficult to assemble and the multi-stage hole needs to be tapped to match the extrusion sleeve 31 for assembly.

[0036] When the extrusion mechanism 3 is to be disassembled, the lock of the extrusion drive cylinder 35 is released, and the extrusion sleeve 31 and the quick-change ejector rod 34 slide downward under the action of gravity to disengage from the multi-stage hole, so that the extrusion sleeve 31 can be removed very quickly without the need for special tools to reach into the multi-stage hole to assist in disassembly and assembly, which greatly improves the maintenance efficiency. It is understandable that if the extrusion sleeve 31 is stuck in the multi-stage hole and the extrusion sleeve 31 cannot slide down by gravity, the extrusion sleeve 31 can be tapped or pressed on the outside of the core pulling block 24 to cause the extrusion sleeve 31 to disengage from the multi-stage hole.

[0037] During operation, the extrusion drive cylinder 35 drives the extrusion pin 32 to move through the transmission rod 33, so that the extrusion rod extends into the mold cavity for pressurization to reduce shrinkage holes in the casting. After the extrusion of the casting is completed, the extrusion drive cylinder 35 pulls the extrusion pin 32 back into the extrusion sleeve 31 through the transmission rod 33. In fact, the extrusion sleeve 31 of the die-casting mold plays the following roles: 1. Guiding role: The extrusion sleeve 31 can provide a stable guide for the extrusion pin 32 to ensure the uniform application of the extrusion force. It can keep the trajectory of the extrusion rod accurate and stable during the movement. 2. Buffering role: When the extrusion pin 32 moves to the end or contacts the workpiece, the extrusion sleeve 31 can buffer the impact force, reduce the friction and wear between the extrusion pin 32 and the mold, and extend the service life of the mold. 3. Sealing role: The extrusion sleeve 31 can prevent the liquid metal from leaking into the interior of the extrusion mechanism 3 by sealing with the extrusion rod, keep the working environment clean, and avoid damage to the mechanism by the liquid metal. Generally speaking, the extrusion sleeve 31 plays the functions of guiding, buffering and sealing in the extrusion mechanism 3 of the die-casting mold, ensuring the smooth progress of the extrusion process and improving the service life of the mold.

[0038] The die-casting mold of the rear frame provided by the present invention completely changes the traditional way of fixing the extrusion sleeve 31. The quick ejector rod and the extrusion drive cylinder 35 provide an upward tightening force for the extrusion sleeve 31, so that the extrusion sleeve 31, the quick-change ejector rod 34, and the extrusion drive cylinder 35 are fixed by abutting against each other from top to bottom in sequence, thereby axially positioning the extrusion sleeve 31 and the quick-change ejector rod 34, which is convenient for installation and solves the technical problem that the extrusion sleeve 31 is difficult to assemble and the multi-stage holes need to be tapped to match the assembly of the extrusion sleeve 31. When the extrusion mechanism 3 is to be disassembled, the lock of the extrusion drive cylinder 35 is released, and the extrusion sleeve 31 and the quick-change ejector rod 34 slide downward and disengage from the multi-stage hole under the action of gravity, so that the extrusion sleeve 31 can be removed very quickly without the need for special tools to extend into the multi-stage hole to assist in disassembly and assembly, greatly improving maintenance efficiency.

[0039] Specifically, the extrusion mechanism 3 also includes a fixed lock head 36, on which a mounting hole 361 and a threaded hole 362 are sequentially penetrated along its axis, and the aperture of the mounting hole 361 is smaller than the aperture of the threaded hole 362; the extrusion pin 32 includes a pin shaft body 321 and a limiting protrusion 322 arranged at one end of the pin shaft body 321, the pin shaft body 321 cooperates with the mounting hole 361, and the limiting protrusion 322 is located in the threaded hole 362, and a threaded column 331 is provided at one end of the transmission rod 33, and the threaded column 331 cooperates with the threaded hole 362 of the fixed lock head 36 and presses the limiting protrusion 322 upward. When the extrusion pin 32 is connected with the quick-change ejector rod 34, the extrusion end of the extrusion pin 32 is first extended into the threaded hole 362 and passed through the mounting hole 361. Since the outer diameter of the limiting protrusion 322 is larger than the mounting hole 361, the limiting protrusion 322 cannot pass through the mounting hole 361 and remains in the threaded hole 362. Then the threaded column 331 on the transmission rod 33 is screwed into the threaded hole 362 of the fixed lock head 36. The threaded column 331 supports the limiting protrusion 322 to lock the extrusion pin 32. The transmission rod 33 is connected to the extrusion pin 32 through the fixed lock head 36. The connection is firm and reliable, and the fixed lock head 36 can also slide smoothly in the second hole 3412.

[0040] Preferably, a positioning step 311 is provided at the tail of the extrusion sleeve 31, and the inner hole in the extrusion sleeve 31 includes a first shaft hole 312 and a second shaft hole 313 connected to each other, the first shaft hole 312 is located at the head of the extrusion sleeve 31 and is slidably connected to the extrusion pin 32, and an avoidance gap 314 is formed between the second shaft hole 313 and the extrusion pin 32. Through such an arrangement, the first shaft hole 312 and the extrusion pin 32 are slidably matched, which, on the one hand, guides the movement of the extrusion pin 32, and on the other hand, can prevent liquid metal from leaking from the first shaft hole 312 to the inside of the extrusion mechanism 3. Since there is an avoidance gap 314 between the second shaft hole 313 and the extrusion shaft, the friction between the extrusion sleeve 31 and the extrusion pin 32 can be reduced, ensuring that the extrusion pin 32 slides smoothly.

[0041] Specifically, Figure 3 , Figure 9-11 The movable mold frame 11 is provided with a lower guide rail 441 slidably connected to the bottom of the slider 23 and an upper guide rail 442 slidably connected to the top of the slider 23. The upper guide rail 442 and the lower guide rail 441 extend in the transverse direction and jointly guide the slider 23 to move in the transverse direction. That is, when the piston rod of the core-pulling driving cylinder 26 is extended or retracted, the core-pulling driving cylinder 26, the mounting plate 25 and the slider 23 will form a whole and move together. It can be understood that the core-pulling driving cylinder 26, the mounting plate The weight of the core pulling of the core pulling drive cylinder 26, the mounting plate 25, the slider 23 and the core pulling block 24 is borne by the lower guide rail 441 structure. Since the total weight of the core pulling drive cylinder 26, the mounting plate 25, the slider 23 and the core pulling block 24 is very large, the lower guide rail 441 structure is easily overloaded and deformed, which in turn affects the smoothness of movement and the precision of positioning of the slider 23 and the core pulling block 24. Therefore, a support plate 47 fixed to the movable mold is provided below the mounting plate 25, and the support plate 47 extends horizontally and is used to support the mounting plate 25.

[0042] By adding a support plate 47 under the mounting plate 25, the lower guide rail 441 is transformed from originally bearing all the loads (the slider 23, the core pulling block 24, the mounting plate 25 and the gravity of the cylinder) to bearing the load together with the lower guide rail 441 and the support plate 47, thereby reducing the load on the lower guide rail 441, effectively preventing the lower guide rail 441 from being overloaded and deformed, and ensuring the smoothness and accuracy of the core pulling movement of the slider 23.

[0043] Since the oil cylinder will drive the mounting plate 25 and the slider 23 and the core pulling block 24 on the mounting plate 25 to move horizontally when the core pulling block 24 is to close or open the mold, that is, the mounting plate 25 moves relative to the support plate 47, a wear-resistant pad 481 is laid on the top of the support plate 47, and a wear-resistant block 482 is provided at the bottom of the mounting plate 25, and the wear-resistant pad 481 is slidably connected with the wear-resistant block 482. Since the wear-resistant pad 481 and the wear-resistant block 482 are both made of wear-resistant materials, not only is it ensured that the wear-resistant block 482 slides smoothly relative to the wear-resistant pad 481, but also the service life of the support plate 47 is provided.

[0044] Specifically, the wear-resistant pads 481 are provided with two pieces, and the two wear-resistant pads 481 are separated by a guide bar 483. The wear-resistant blocks 482 are the same in number and correspond to the wear-resistant pads 481, that is, the wear-resistant blocks 482 are located on both sides of the guide bar 483. Through such an arrangement, the guide bar 483 plays a role in lateral movement guidance and limiting for the movement of the wear-resistant blocks 482, thereby preventing the mounting plate 25 from shifting forward and backward when moving.

[0045] In this embodiment, the support plate 47 includes a flat plate portion 471, a vertical plate portion 472, and a plurality of reinforcing ribs 473 for reinforcing the connection between the flat plate portion 471 and the vertical plate portion 472. The flat plate portion 471 and the vertical plate portion 472 are combined to form an L-shaped plate structure, and the vertical plate portion 472 is screwed to fix the support plate 47 on the movable mold frame 11. The flat plate portion 471, the vertical plate portion 472, and the reinforcing ribs 473 form a stable triangular structure. The support plate 47 has a firm structure and good bearing capacity, and can well share the load borne by the lower guide rail 441.

[0046] In this embodiment, in order to ensure that there is sufficient power to drive the slider 23 and the core pulling block 24 to move, two core pulling drive cylinders 26 are configured, and the two core pulling drive cylinders 26 are arranged up and down. When the core pulling block 24 is to be molded, the piston rod of the core pulling drive cylinder 26 shrinks and resets, driving the mounting plate 25, the core pulling block 24 and the slider 23 to move toward the mold cavity together. When the mounting plate 25 is completely in contact with the side of the movable mold, it means that the core pulling block 24 is in place. Since there is a certain gap tolerance in the assembly of the two cylinders, the mounting plate 25 and the slider 23, an adjusting pad 451 is provided on the end face of the mounting plate 25 facing the movable mold frame 11. The balance can be flexibly adjusted by adjusting the thickness of the pad 451 to ensure that the upper and lower sides of the mounting plate 25 are balanced and in place at the same time after the core pulling block 24 is molded.

[0047] Since the contact area between the rear frame and the core pulling block 24 is relatively large, the clamping force of the core pulling block 24 will also be relatively large. The core pulling block 24 is easy to move with the casting when it is ejected and demolded. In addition, due to the different temperatures in the die-casting production environment, the pulling force required for core pulling is different, which will cause the rear frame to have different degrees of deformation risks and affect the casting quality of the rear frame. Therefore, it is necessary to set a core pulling and ejecting structure.

[0048] See also Figure 12-14 The core-pulling ejection structure includes an ejection oil cylinder 563, an ejection panel 551 and an ejection rod 552. The end surface of the slider 23 facing the core-pulling block 24 is provided with a first concave cavity 541, and the ejection panel 551 is provided in the first concave cavity 541. The ejection panel 551 is provided with a plurality of ejection rods 552 passing through the core-pulling block 24 and facing the mold cavity. The ejection oil cylinder 563 is provided on the mounting plate 25. The ejection oil cylinder 563 is connected to the ejection panel 551 through a transmission connecting rod 562, and the transmission connecting rod 562 passes through the slider 23. It can be understood that the plurality of ejection rods 552 are densely and evenly distributed, acting on the matching area between the rear frame and the core-pulling block 24 to enhance the demoulding effect.

[0049] After the aluminum liquid cools down to become a casting product, before demoulding, the ejector cylinder 563 first drives the ejector rod 552 on the ejector panel 551 to extend into the cavity, and all the ejector rods 552 exert a tightening force on the surface of the casting. Then the slider 23 core pulling drive mechanism drives the slider 23 and the core pulling block 24 to move together in the demoulding direction, thereby avoiding the core pulling away from the casting and preventing the casting from being stretched and deformed.

[0050] Specifically, the end surface of the core pulling block 24 facing the first concave cavity 541 is provided with a second concave cavity 542 that matches the first concave cavity 541. It can be understood that the first concave cavity 541 and the second concave cavity 542 form a movable cavity for the core pulling block 24 to move, that is, the ejection panel 551 is located in the first concave cavity 541 in the initial state, and the ejection panel 551 moves from the first concave cavity 541 to the second concave cavity 542 during ejection.

[0051] Preferably, a plurality of guide posts 543 are provided on the end surface of the ejection panel 551 facing the core pulling block 24, and guide holes 544 are fixedly provided in the second concave cavity 542 of the core pulling block 24, the number of which is the same as that of the guide posts 543 and which are matched one by one. The cooperation between the guide posts 543 and the guide holes 544 provides a moving guide for the ejection panel 551, prevents the ejection panel 551 from shaking in the movable cavity, improves the stability of the movement of the ejection panel 551 and the ejection rod 552, and ensures that the ejection rod 552 will not interfere with the core pulling block 24 and bend during the movement.

[0052] In order to detect the movable stroke of the ejection panel 551, a stroke detection assembly 57 is provided on the oil cylinder. The oil cylinder is a double-axis oil cylinder. The stroke detection assembly 57 includes a mounting panel, a first stroke switch and a second stroke switch arranged on the mounting panel, a guide rod slidably arranged on the mounting panel and extending along the axial direction of the double-axis oil cylinder, and a trigger ring sleeved on the guide rod. The end of the double-axis oil cylinder away from the ejection panel 551 is connected to the guide rod through a connecting rod. When the trigger ring triggers the first stroke switch, it means that the ejection rod 552 accurately moves to the set ejection position. When the trigger ring triggers the second stroke switch, it means that the ejection rod 552 is reset and retracted into the core-pulling block 24. The die-casting production system determines the movement of the ejection rod 552 in place through the feedback signals of the first stroke switch and the second stroke switch.

[0053] In order to ensure that the force acting on the ejection panel 551 is uniform and the ejection rod 552 exerts sufficient ejection force on the casting, two ejection oil cylinders 563 are arranged in parallel, and the two ejection oil cylinders 563 drive the slider 23 to move through the transmission connecting rod 562 respectively.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A squeezing mechanism, characterized in that: It includes an extrusion sleeve, an extrusion pin, a transmission rod, a quick-change push rod and an extrusion drive cylinder. The extrusion pin slides through the extrusion sleeve along the axis of the extrusion sleeve. The quick-change push rod is provided with a stepped hole along its axis. The stepped hole includes a first hole that slides with the extrusion pin and a second hole that slides with the transmission rod. The extrusion drive cylinder is drivingly connected to the transmission rod, and the transmission rod is drivingly connected to the extrusion pin. The end of the quick-change push rod with the first hole is used to support the tail of the extrusion sleeve upwards, and the end of the quick-change push rod with the second hole is supported upwards by the extrusion drive cylinder.

2. The extrusion mechanism according to claim 1, characterized in that: The extrusion mechanism also includes a fixed lock head, and the fixed lock head is sequentially penetrated by a mounting hole and a threaded hole along its axis, and the aperture of the mounting hole is smaller than the aperture of the threaded hole; the extrusion pin includes a pin shaft body and a limiting protrusion arranged at one end of the pin shaft body, the pin shaft body cooperates with the mounting hole, the limiting protrusion is located in the threaded hole, and a threaded column is provided at one end of the transmission rod, and the threaded column cooperates with the threaded hole of the fixed lock head and presses the limiting protrusion upward.

3. The extrusion mechanism according to claim 2, characterized in that: A positioning step is provided at the tail of the extrusion sleeve, and the inner hole in the extrusion sleeve includes a first axial hole and a second axial hole connected to each other. The first axial hole is located at the head of the extrusion sleeve and is slidably connected to the extrusion pin, and an avoidance gap is formed between the second axial hole and the extrusion shaft.

4. The disassembly and assembly method of the extrusion mechanism is characterized in that: The disassembly method of the extrusion mechanism includes an installation method of the extrusion mechanism and a disassembly method of the extrusion mechanism. The installation method of the extrusion mechanism specifically includes: A. The extrusion pin is connected to the head of the transmission rod, and the tail of the transmission rod is connected to the output end of the extrusion drive cylinder. The extrusion pin and the transmission rod are placed in the second hole of the quick-change ejector rod. The extrusion pin slides out of the first hole, and the transmission rod is also slidably connected to the second hole of the quick-change ejector rod. The extrusion sleeve is put on the extrusion pin, and the tail of the extrusion sleeve is pressed against the head of the quick-change ejector rod to realize the assembly of the extrusion mechanism. B. There are multi-level holes reserved on the slider core puller. Put the extrusion pin, extrusion sleeve, quick-change ejector and transmission rod into the multi-level holes. After the extrusion sleeve and quick-change ejector are assembled with the multi-level holes, lock the extrusion drive cylinder on the slider core puller. The disassembly method of the extrusion mechanism specifically comprises: releasing the lock of the extrusion drive cylinder, and the extrusion sleeve and the quick-change ejector rod slide downward under the action of gravity to separate from the multi-stage hole of the slide core.

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