Automobile part die-casting machine

Abstract

The invention relates to the technical field of casting mechanical equipment, in particular to an automobile part die-casting machine which comprises a base, a fixed die seat plate fixed to the top of the base, a movable die seat plate arranged on the base in a sliding mode and an injection device used for injecting materials into an injection hole of the fixed die seat plate. Pressurizing locking mechanisms are arranged on the two sides of the movable mold seat plate, and locking grooves matched with the pressurizing locking mechanisms are formed in the fixed mold seat plate. Through the synergistic effect of the pressurization locking mechanism and the mechanical linkage assembly, rigid radial locking of the edge of the mold parting surface is achieved through the first inclined face of the wedge block, elastic deformation of the movable mold and the fixed mold caused by injection high pressure is effectively resisted, and the flash problem of a large thin-wall casting is reduced; meanwhile, the sealing sleeve is passively driven through the pressing plate and the L-shaped lever mechanism by means of the second inclined face of the wedge block, mold clamping force is converted into axial sealing force amplified by a lever, and mechanical synchronization of locking and sealing actions is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casting mechanical equipment, and in particular to an automobile part die casting machine. BACKGROUND

[0002] With the development of the automobile industry towards light weight and precision, aluminum and magnesium alloy die castings are increasingly widely used in automobile structural parts. Such automobile parts usually have the characteristics of large projected area, uneven wall thickness, and extremely high requirements for internal porosity and dimensional accuracy. In order to meet the production requirements, the die casting machine must have extremely high locking rigidity and reliable injection sealing performance. However, the existing die casting equipment still has the following significant technical pain points in actual production: The "breathing effect" of the traditional locking structure causes the flash problem; the existing die casting machine mainly adopts a "elbow connecting rod + four columns of golin (tension rod)" locking structure. When the mold is locked, the locking force is mainly concentrated in the four corner areas where the golin columns are installed. For automobile structural parts with a large projected area, when the molten metal liquid with a pressure of tens of megapascals is instantaneously injected into the mold cavity, the huge swelling force will force the fixed mold base plate and the movable mold base plate to elastically deform slightly. Due to the physical properties of steel, the golin column will produce a micron-level elastic elongation in the axial direction when subjected to force, resulting in insufficient locking force in the center area of the mold parting surface or the edge area away from the tension rod, causing an instantaneous "opening mouth" phenomenon (i.e. breathing effect), which leads to dimensional tolerance of the casting, and a special deburring process must be added subsequently, greatly increasing the production cost; and the independence of the injection sealing system leads to complex and unreliable injection sealing action.

[0003] In summary, there is a lack of an integrated mechanical solution in the prior art that can simultaneously solve the problems of "insufficient locking rigidity at the edge of large plane mold" and "complex and unreliable injection sealing action". How to use mechanical structure to realize the linkage of locking force enhancement and sealing action has become a technical problem to be solved by those skilled in the art. SUMMARY

[0004] Therefore, the purpose of the present application is to provide an automobile part die casting machine to solve the problem of flash caused by insufficient locking rigidity.

[0005] Based on the above purpose, the application provides an automobile part die casting machine, which comprises a base, a fixed mold base plate fixed on the top of the base, a movable mold base plate slidingly arranged on the base, and a pressure injection device for injecting material into the injection hole of the fixed mold base plate; both sides of the movable mold base plate are provided with a pressurized locking mechanism, and the fixed mold base plate is provided with a locking groove matched with the pressurized locking mechanism; the pressurized locking mechanism comprises a wedge slidingly arranged on the side of the movable mold base plate and a connecting rod for driving the wedge to move; the outer periphery of the injection hole of the fixed mold base plate is movably provided with a sealing sleeve, and the fixed mold base plate is further provided with a linkage plate for driving the sealing sleeve to move axially, and the linkage plate is hinged to the fixed mold base plate; the fixed mold base plate is provided with a through hole communicating the locking groove and the space where the linkage plate is located, and a pressing plate is slidingly arranged in the through hole; one side of the wedge towards the fixed mold base plate is provided with a first inclined surface and a second inclined surface; when the connecting rod drives the wedge to insert into the locking groove, the first inclined surface cooperates with the inner wall of the locking groove to realize mold locking, and the second inclined surface synchronously abuts against the pressing plate, so that the pressing plate drives the linkage plate to rotate around the hinge point thereof and generates a lever action, thereby driving the sealing sleeve to tightly abut against the end face of the pressure injection cylinder of the pressure injection device to realize sealing.

[0006] Further, the pressurized locking mechanism further comprises a guide plate fixed on the side of the movable mold base plate, and the wedge slides along the guide plate in a radial direction perpendicular to the movement direction of the movable mold base plate; the first inclined surface is ramped towards the side close to the guide plate from the middle of the wedge, and the second inclined surface is ramped towards the side away from the guide plate from the middle of the wedge.

[0007] Further, the guide plate is provided with a sliding hole, and a sliding block matched with the sliding hole is arranged in the sliding hole, the sliding block is fixedly connected to the side of the wedge away from the fixed mold base plate, and is used for limiting the sliding freedom degree of the wedge.

[0008] Further, the connecting rod comprises a rod body and a fixed rod; the fixed rod is fixedly arranged on the base; one end of the rod body is hinged to the end of the wedge, and the other end is hinged to the fixed rod, and the axial movement stroke of the movable mold base plate is converted into the force for driving the wedge to slide radially.

[0009] Further, the linkage plate comprises an L-shaped plate and a pry bar fixed to one end of the L-shaped plate; the other end of the L-shaped plate extends into the through hole; and the pry bar overlaps with the back surface of the flange surface of the sealing sleeve.

[0010] Further, the hinge point position of the L-shaped plate and the fixed mold base plate is close to one end of the pry bar, so that the stroke of the pressing plate driving the L-shaped plate is converted into the force output of the end of the pry bar.

[0011] Further, the fixed mold base plate is provided with a movable groove located at the outer periphery of the injection hole, and the sealing sleeve is slidingly arranged in the movable groove; and the end face of the sealing sleeve is provided with a high-temperature-resistant sealing gasket.

[0012] Further, a reset spring is connected between the sealing sleeve and the groove bottom of the movable groove, used to drive the sealing sleeve to retract and reset when the wedge block exits the locking groove.

[0013] Further, a connecting spring is arranged between the pressing plate and the inner wall of the through hole, which pushes the pressing plate to move to the side close to the wedge block in the natural state, so that the force receiving end of the pressing plate extends into the locking groove to wait for the contact of the wedge block.

[0014] Further, the end of the pressing plate extending into the locking groove is provided with a force receiving inclined surface matched with the angle of the second inclined surface of the wedge block, used to push the pressing plate slidingly arranged in the through hole.

[0015] The beneficial effects of the present application are as follows: from the above description, it can be seen that the automobile part die casting machine provided by the present application realizes the rigid radial locking of the parting surface edge of the mold through the first inclined surface of the wedge block by the synergistic effect of the pressure locking mechanism and the mechanical linkage assembly, effectively resists the elastic deformation of the movable and fixed molds caused by the high pressure of injection, and reduces the flash problem of large thin-walled castings; at the same time, the second inclined surface of the wedge block passively drives the sealing sleeve through the pressing plate and the L-shaped lever mechanism, converts the radial mold locking force into the axial sealing force amplified by the lever, realizes the mechanical synchronization of the locking and sealing actions, ensures the high reliability sealing between the injection cylinder and the mold under the high temperature thermal expansion working condition, and significantly improves the internal density and yield of the vacuum die castings. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only illustrate the present application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0017] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the present application. Figure 2 It is a schematic diagram of the overall structure of the embodiment of the present application. Figure 1 It is a schematic diagram of the enlarged structure of A in the embodiment of the present application. Figure 3 It is a schematic diagram of the structure of the fixed mold base plate of the embodiment of the present application. Figure 4 It is a schematic diagram of the overall structure of the embodiment of the present application. Figure 3 It is a schematic diagram of the enlarged structure of B in the embodiment of the present application. Figure 5 It is a schematic diagram of the split structure of the sealing sleeve and the movable groove of the embodiment of the present application. Figure 6 It is a schematic diagram of the enlarged structure of C in the embodiment of the present application. Figure 5 It is a schematic diagram of the split structure of the sealing sleeve and the movable groove of the embodiment of the present application.Figure 7 This is a schematic diagram of the linkage plate structure according to an embodiment of the present invention; Figure 8 This is a cross-sectional view of the sealing sleeve according to an embodiment of the present invention.

[0018] The diagram is marked as follows: 1. Base; 2. Fixed mold base plate; 21. Injection hole; 22. Movable groove; 3. Moving mold base plate; 4. Pressing device; 5. Injection device; 51. Injection barrel; 6. Pressure-increasing locking mechanism; 61. Guide plate; 611. Sliding hole; 612. Sliding block; 62. Wedge; 63. Connecting rod; 631. Rod body; 632. Fixing rod; 64. Locking groove; 7. Sealing sleeve; 71. Return spring; 8. Linkage plate; 81. Pressure plate; 811. Connecting spring; 82. L-shaped plate; 821. Pin shaft; 822. Pry bar; 83. Through hole. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0020] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the present invention provides a die-casting machine for automotive parts, the main structure of which includes a base 1 fixedly installed on the ground. A fixed mold base plate 2 is fixedly installed at one end of the top of the base 1, and a movable mold base plate 3 is slidably installed at the other end. The movable mold base plate 3 reciprocates linearly along the base 1 under the drive of a pressing device 4 (such as a mold closing cylinder) to realize the mold closing or mold opening action with the fixed mold base plate 2.

[0022] An injection device 5 is provided on the side of the fixed mold base plate 2 away from the moving mold base plate 3. The injection cylinder 51 at the front end of the injection device 5 is inserted into the injection hole 21 located in the middle of the fixed mold base plate 2. The injection hole 21 is connected to the pressure chamber of the mold.

[0023] In this embodiment, to improve the mold clamping capability, pressure-boosting locking mechanisms 6 are respectively provided on the left and right sides of the moving mold base plate 3. The pressure-boosting locking mechanism 6 includes a guide plate 61 fixedly installed on the side wall of the moving mold base plate 3. The guide plate 61 has a sliding hole 611, which is preferably a dovetail-shaped structure. A slider 612 is fitted inside the sliding hole. The slider 612 is fixedly connected to the back of the wedge block 62, thereby restricting the wedge block 62 to slide radially along the guide plate 61, perpendicular to the movement direction of the moving mold base plate 3.

[0024] Locking grooves 64 that mate with wedges 62 are provided on corresponding sides of the fixed mold base plate 2. A connecting rod 63 is provided to drive the wedges 62 to produce the radial sliding. The connecting rod 63 includes a rod body 631 and a fixed rod 632. The fixed rod 632 is fixedly mounted on the base 1 and arranged along the extension direction of the locking grooves 64. The two ends of the rod body 631 are respectively hinged to the end of the wedges 62 and the fixed rod 632. Thus, by utilizing the axial displacement of the moving mold base plate 3, the wedges 62 are driven to produce radial displacement through the change in the geometric relationship of the connecting rod 63.

[0025] To achieve automatic sealing of the injection end without the need for an independent power source, a mechanical linkage component is integrated inside the fixed mold base plate 2. Specifically, the fixed mold base plate 2 has a through hole 83 that connects to the locking groove 64. A pressure plate 81 is slidably disposed in the through hole 83. A connecting spring 811 is provided between the pressure plate 81 and the inner wall of the through hole 83. In its natural state, the connecting spring 811 pushes the pressure plate 81 to move towards the locking groove 64, so that the force-bearing end of the pressure plate 81 is located in the locking groove 64 and is in a ready-to-trigger state.

[0026] A linkage plate 8 is also provided inside the fixed mold base plate 2. The linkage plate 8 is preferably an L-shaped plate 82, which is hinged to the inside of the fixed mold base plate 2 by a pin 821 at its corner. One end of the L-shaped plate 82 extends into the through hole 83 and contacts the pressure plate 81, while the other end is fixedly connected to a pry bar 822. At the same time, an annular movable groove 22 is provided on the outer periphery of the injection hole 21. The sealing sleeve 7 is slidably disposed in the movable groove 22. A high-temperature resistant sealing gasket is provided on the end flange face of the sealing sleeve 7, and the end of the pry bar 822 overlaps the back side of the flange face of the sealing sleeve 7. A return spring 71 is provided between the sealing sleeve 7 and the bottom of the movable groove 22.

[0027] The aforementioned wedge 62, pressure plate 81, L-shaped plate 82, and sealing sleeve 7 can be made of high-strength materials, and a lubrication structure can be provided at their relative moving contact points to improve reliability and durability under high load conditions.

[0028] The wedge 62 has a first inclined surface and a second inclined surface on the side facing the fixed mold base plate 2. The first inclined surface is used to cooperate with the inner wall of the locking groove 64 to achieve mold closing and locking, and the second inclined surface is used to trigger the mechanical linkage component.

[0029] When the pressing device 4 drives the moving mold base plate 3 to move towards the fixed mold base plate 2 for mold closing, since one end of the rod 631 is hinged to the fixed rod 632 fixedly set on the base 1, the included angle of the rod 631 changes as the moving mold base plate 3 moves forward, thereby pushing the wedge 62 to slide radially along the guide plate 61 towards the locking groove 64. After the moving mold base plate 3 and the fixed mold base plate 2 are in contact, the wedge 62 is inserted into the locking groove 64, and its first inclined surface cooperates with the inclined surface of the locking groove 64, converting the radial thrust of the wedge 62 into an axial tensile force for locking the moving mold base plate 3 and the fixed mold base plate 2, thereby forming a reliable mold closing and locking state.

[0030] Meanwhile, as the wedge 62 continues to move into the lock groove 64, its second inclined surface contacts and pushes the pressure plate 81 extending into the lock groove 64. Under the action of the second inclined surface, the pressure plate 81 overcomes the elastic force of the connecting spring 811 and slides inward along the through hole 83, thereby pushing the L-shaped plate 82 to rotate around its hinge point. Since the hinge point is located on the side close to the pry bar 822, the L-shaped plate 82 constitutes a force-saving lever structure, thereby amplifying the thrust input by the pressure plate 81 and transmitting it to the pry bar 822.

[0031] Under the action of the thrust, the pry bar 822 pushes the sealing sleeve 7 to overcome the elastic force of the return spring 71 and move axially along the movable groove 22 until the high temperature resistant sealing gasket at the end of the sealing sleeve 7 is tightly attached to the end face of the injection cylinder 51, thereby achieving end face sealing of the injection hole 21.

[0032] When die casting is completed and mold opening is required, the pressing device 4 drives the moving mold base plate 3 to retract, and the connecting rod 63 reverses to drive the wedge block 62 out of the locking groove 64. After the wedge block 62 disengages, the pressure plate 81 resets under the action of the connecting spring 811, the linkage plate 8 rotates accordingly, and at the same time, the sealing sleeve 7 retracts under the action of the reset spring 71, disengaging from contact with the injection cylinder 51, completing the mechanism reset and entering the next working cycle.

[0033] It can be seen that the sealing action of the sealing sleeve 7 is structurally entirely dependent on the mold closing and locking action of the wedge block 62, and can only occur after the mold closing and locking is completed. Thus, at the mechanism level, the timing consistency and mechanical linkage of the mold closing and locking action and the sealing action of the injection end are realized. Through the double inclined surfaces of the same wedge block 62, the structural decoupling and functional reuse of the mold clamping force and the sealing force are realized.

[0034] While meeting the overall rigidity requirements for force transmission, the L-shaped plate 82 has a certain degree of micro-deformation capability. Its material selection and structural dimensions enable it to produce micro-deformation when subjected to abnormal overload or instantaneous impact load, thereby buffering the force transmitted from the pressure plate 81 to the pry bar 822 and preventing structural damage to the L-shaped plate 82, pry bar 822 or sealing sleeve 7 due to local stress concentration.

[0035] It should be noted that the elastic deformation of the L-shaped plate 82 is only used for overload protection and buffering. Under normal working conditions, it is still mainly used as a rigid force transmission component. The axial force required for the sealing sleeve 7 to generate a seal still comes from the mold clamping force of the wedge block 62, which is transmitted through the mechanical linkage component.

[0036] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0037] This invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A die-casting machine for automotive parts, comprising a base (1), a fixed mold plate (2) fixed to the top of the base, a movable mold plate (3) slidably disposed on the base, and an injection device (5) for injecting material into the injection hole (21) of the fixed mold plate; characterized in that, The moving mold base plate (3) is provided with a pressure-increasing locking mechanism (6) on both sides, and the fixed mold base plate (2) is provided with a locking groove (64) that cooperates with the pressure-increasing locking mechanism (6); the pressure-increasing locking mechanism (6) includes a wedge (62) slidably disposed on the side of the moving mold base plate and a connecting rod (63) for driving the wedge to move; a sealing sleeve (7) is movably disposed on the outer periphery of the injection hole (21) of the fixed mold base plate (2), and a linkage plate (8) for driving the sealing sleeve (7) to move axially is also provided in the fixed mold base plate (2), and the linkage plate (8) is hinged to the fixed mold base plate (2); a through hole (83) is provided on the fixed mold base plate (2) to connect the locking groove (64) and the space where the linkage plate (8) is located, and a pressure plate (81) is slidably disposed in the through hole (83); The wedge (62) is provided with a first inclined surface and a second inclined surface on the side facing the fixed mold base plate (2). When the connecting rod (63) drives the wedge (62) to insert into the locking groove (64), the first inclined surface cooperates with the inner wall of the locking groove (64) to achieve mold closing and locking. The second inclined surface simultaneously presses against the pressure plate (81), causing the pressure plate (81) to push the linkage plate (8) to rotate around its hinge point and generate a lever action, thereby driving the sealing sleeve (7) to tightly adhere to the end face of the injection cylinder (51) of the injection device (5) to achieve sealing.

2. The die-casting machine for automotive parts according to claim 1, characterized in that, The pressure-increasing locking mechanism (6) also includes a guide plate (61) fixed on the side of the moving mold base plate (3). The wedge (62) slides radially along the guide plate (61) perpendicular to the direction of movement of the moving mold base plate (3). The first inclined surface slopes towards the side close to the guide plate (61) with the middle of the wedge (62), and the second inclined surface slopes away from the guide plate (61) with the middle of the wedge (62).

3. The die-casting machine for automotive parts according to claim 2, characterized in that, The guide plate (61) has a sliding hole (611) and a slider (612) is fitted inside the sliding hole (611). The slider (612) is fixedly connected to the side of the wedge (62) away from the fixed mold base plate (2) to limit the sliding freedom of the wedge (62).

4. The die-casting machine for automotive parts according to claim 1, characterized in that, The connecting rod (63) includes a rod body (631) and a fixed rod (632); the fixed rod (632) is fixedly mounted on the base (1); one end of the rod body (631) is hinged to the end of the wedge (62), and the other end is hinged to the fixed rod (632), and the axial movement stroke of the moving mold base plate (3) is converted into a force to drive the wedge (62) to slide radially.

5. The die-casting machine for automotive parts according to claim 1, characterized in that, The linkage plate (8) includes an L-shaped plate (82) and a pry bar (822) fixed to one end of the L-shaped plate; the other end of the L-shaped plate (82) extends into the through hole (83); the pry bar (822) overlaps with the back of the flange face of the sealing sleeve (7).

6. The die-casting machine for automotive parts according to claim 5, characterized in that, The hinge point between the L-shaped plate (82) and the fixed mold base plate (2) is close to one end of the pry bar (822), so that the stroke of the pressure plate (81) pushing the L-shaped plate (82) is converted into the force output of the pry bar (822).

7. The die-casting machine for automotive parts according to claim 1, characterized in that, The fixed mold base plate (2) is provided with a movable groove (22) located on the outer periphery of the injection hole (21), and the sealing sleeve (7) is slidably disposed in the movable groove (22); the end face of the sealing sleeve (7) is provided with a high temperature resistant sealing gasket.

8. The die-casting machine for automotive parts according to claim 7, characterized in that, A return spring (71) is connected between the sealing sleeve (7) and the bottom of the movable groove (22) to drive the sealing sleeve (7) to retract and reset when the wedge (62) exits the locking groove (64).

9. The die-casting machine for automotive parts according to claim 1, characterized in that, A connecting spring (811) is provided between the pressure plate (81) and the inner wall of the through hole (83). The connecting spring (811) pushes the pressure plate (81) to move towards the side closer to the wedge (62) in its natural state, so that the force-bearing end of the pressure plate (81) extends into the locking groove (64) to wait for the wedge (62) to contact.

10. A die-casting machine for automotive parts according to claim 1, characterized in that, The end of the pressure plate (81) that extends into the lock groove (64) is provided with a force-bearing inclined surface that matches the second inclined surface angle of the wedge (62), which is used for the wedge (62) to push the pressure plate (81) that is slidably disposed in the through hole (83).

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