Low-pressure casting device and low-pressure casting mold bottom mold synchronous material lifting device

Abstract

The application discloses a low-pressure casting device and a low-pressure casting mold bottom mold synchronous material lifting device. The device comprises a top plate assembly, a plurality of sliding blocks, a plurality of sliding block fixing blocks, a plurality of springs, a plurality of top mold inclined rods, a plurality of bottom mold inclined rods, a plurality of top rods and a plurality of reset rods. The contact surfaces of the sliding block, the top mold inclined block and the bottom mold inclined block are inclined surfaces, which provide driving when the top mold and the reset rod are lifted. The bottom of the top mold inclined rod is in the shape of a hook, which can hook the sliding block to move upwards to lift the top mold. The material lifting device in the low-pressure casting device adopts a pure mechanical structure design, and the manufacturing cost is far lower than that of a side-pulling assembly with an oil cylinder. The device does not need to be connected to the hydraulic system of a low-pressure machine, and manual operation is not needed, so that the time and displacement distance of the movement of the bottom mold lifting plate and the opening of the top mold can be completely automatically synchronized. The device solves the problems of difficulty in leaving the top mold for a casting with a large holding force of the bottom mold and easy deformation of a thin plate type casting when the mold is opened, and is safe, reliable and efficient in operation.

Description

TECHNICAL FIELD

[0001] The present application relates to auxiliary device for casting, in particular to a low pressure casting mold bottom mold synchronous material lifting device. BACKGROUND

[0002] Low pressure casting is a kind of anti-gravity casting process, a crucible furnace is placed below the mold, and a riser pipe is used to connect the furnace cavity and the mold cavity, the compressed air of 100-500 mbar is introduced into the furnace cavity, so that the molten metal in the furnace cavity flows into the mold cavity through the riser pipe, after the molten metal in the mold cavity cools and solidifies, the remaining molten metal flows back to the furnace cavity by removing the pressure of the furnace cavity, and the mold is opened to take out the casting to complete a casting process.

[0003] Because of the particularity of the equipment and process, the design principle of low pressure casting is that the bottom mold (also known as the lower mold) has no ejection device, the casting is left in the top mold (also known as the upper mold) under the action of the holding force after the mold is opened, and the casting is dropped on the receiving tray by the material lifting oil cylinder of the top mold, if the casting is left in the bottom mold by mistake, the production can only be forced to stop.

[0004] For example, some special structures, especially thin plate end cover type castings, the holding force of the bottom mold may be much larger than that of the top mold after determining the pouring position according to the principle of optimal casting filling and solidification, which will cause the casting not to be left in the top mold when the mold is opened, and continuous production is not possible.

[0005] There are two solutions in the prior art: the first one is to increase the material lifting oil cylinder in the bottom mold, but as shown in the above figure, there is usually not enough installation space between the bottom mold and the furnace, even if the material lifting oil cylinder can be installed, the material lifting oil cylinder and the mold opening oil cylinder cannot be hydraulically synchronized (asynchronous will cause the casting to be deformed), in addition, the temperature near the furnace is very high, and the rubber sealing ring of the oil cylinder may be frequently damaged, so this method is almost not used in actual production.

[0006] The second one is to increase some side cores in the part of the casting formed by the top mold to clamp the casting, and after the casting completely separates from the bottom mold, the core is opened to make the casting be ejected, this method needs to increase multiple oil cylinders and corresponding parts on the mold, which obviously increases the mold manufacturing cost, and if the core position is far away from the position with large holding force of the bottom mold, the casting still has a large risk of deformation when the mold is opened. SUMMARY

[0007] In view of the defects or deficiencies of the prior art, the present application provides a low pressure casting device, which comprises a top mold and a bottom mold, the top mold and the bottom mold are assembled to form a mold cavity inside, and the top mold is located above the bottom mold, and the device further comprises:

[0008] a top plate assembly;

[0009] A plurality of sliders; the slider comprises a slider body, a second inclined surface A is arranged on one end surface of the slider body, a through hole is arranged on the slider body, the axial direction of the through hole is parallel to the end surface, a first inclined surface A is arranged on the inner side wall of the through hole, and the end surface where the second inclined surface A is located is parallel to the inner side surface where the first inclined surface A is located;

[0010] A plurality of slider fixing blocks; the slider fixing block comprises a fixing block body, a cavity is arranged in the fixing block body, a first hole and a second hole are arranged on the fixing block body, the first hole is communicated with the cavity, the second hole penetrates through the cavity and passes through the bottom of the cavity, and the axial directions of the first hole and the second hole are parallel;

[0011] A plurality of springs;

[0012] A plurality of top die inclined rods; the top die inclined rod comprises a rod body, a hook structure is arranged at the bottom end of the rod body, and a first inclined surface B is arranged on one side of the bottom surface of the hook;

[0013] A plurality of bottom die inclined rods; the bottom die inclined rod comprises a body rod, and a second inclined surface B is arranged at the bottom of the body rod;

[0014] A plurality of top rods and a plurality of reset rods;

[0015] The top plate assembly is arranged below the bottom die, one end of each top rod is fixed on the top plate assembly, the other end penetrates through the bottom die and extends into the bottom of the mold cavity, and the plurality of top rods are uniformly distributed at the bottom of the mold cavity;

[0016] One end of each reset rod is fixed on the top plate assembly, and the other end penetrates through the bottom die and contacts the parting surface of the top die;

[0017] A plurality of slider fixing blocks are fixed on the top plate assembly and are distributed on the front and rear sides of the top plate assembly; one slider is arranged in the cavity of each slider fixing block, the slider can move left and right in the cavity, a spring is arranged between one end of the slider and the inner wall of the cavity, and the compression direction of the spring is along the movement direction of the slider; the first hole and the second hole are distributed along the movement direction of the slider, and the spring is located at the end close to the second hole;

[0018] The top end of each bottom die inclined rod is fixed on the bottom die, and the distribution mode of the plurality of bottom die inclined rods satisfies that the bottom end of each bottom die inclined rod extends into the cavity through the first hole at the position below the bottom die and is located at the same end as the second inclined surface A of the slider, and the second inclined surface B and the second inclined surface A are matched;

[0019] The top end of each top die inclined rod is fixed on the top die, and the distribution mode of the plurality of top die inclined rods satisfies that the bottom end of each top die inclined rod extends into the cavity through the second hole at the position below the top die and penetrates through the through hole of the slider, the hook surface locally matches the bottom surface of the slider, and in the process that the top surface inclined rod penetrates through the through hole downward, the first inclined surface B and the first inclined surface A are matched; the matching part of the hook surface and the bottom surface of the slider is an inclined surface.

[0020] In a further aspect, the second inclined surface A, the first inclined surface A and the inclined surface of the bottom surface of the slider are different in the angle of inclination.

[0021] Optionally, two sliders are installed on the front and back of the top plate assembly.

[0022] Optionally, the size of the hook is the minimum distance that the casting needs to be separated from the bottom mold. Further optionally, the minimum distance is 20-40 mm.

[0023] Optionally, the four reset rods are distributed at the four corners of the top mold parting surface.

[0024] Optionally, the top plate assembly is assembled by two plates, and a central through hole for accommodating the lifting sleeve is arranged on the top plate assembly, and the plurality of top rods are distributed around the central through hole.

[0025] In a further aspect, the low-pressure casting device further comprises a crucible furnace, the crucible furnace is located below the lower mold, and the top plate assembly is located between the crucible furnace and the lower mold. Further, a low-pressure machine and a mold opening cylinder are further included, the bottom mold and the top surface are connected with the low-pressure machine, and the top mold is connected with the mold opening cylinder.

[0026] The application also provides a low-pressure casting mold bottom mold synchronous material lifting device, which comprises the above-mentioned top plate assembly, a plurality of sliders, a plurality of slider fixing blocks, a plurality of springs, a plurality of top mold inclined rods, a plurality of bottom mold inclined rods, a plurality of top rods and a plurality of reset rods.

[0027] The material lifting device in the low-pressure casting device adopts a pure mechanical structure design, and the manufacturing cost is much lower than that of a side extraction assembly with an oil cylinder. The device does not need to be connected to the hydraulic system of the low-pressure machine, and manual operation is not required. The time and displacement distance of the movement of the bottom mold lifting plate and the opening of the top mold can be completely automatically synchronized, which solves the problem of difficult top mold leaving of the casting with high bottom mold holding force and the problem of easy deformation of the thin plate casting during mold opening, and ensures safe, reliable and efficient operation. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a top view of the top plate assembly and the components installed thereon of the application;

[0029] Figure 2 It is a side view of the top plate assembly and the components installed thereon of the application;

[0030] Figure 3 It is a partial structure diagram of the low-pressure casting device of the application;

[0031] Figure 4 It is aFigure 3 Structure of the slider fixing member

[0032] Figure 5 Structure of the slider of the present application DETAILED DESCRIPTION

[0033] Unless otherwise defined, scientific and technical terms used in this text are understood according to the knowledge of the ordinary skilled in the art.

[0034] The front, back, left, right, bottom, top, upper, lower, and other directional or positional terms described herein are consistent with the corresponding directions or positions in the accompanying drawings of the specification. It should be noted that the specific directions or positions in the accompanying drawings of the specification are intended to explain the present application, and any rotation, exchange, or other transformation of the orientation made by the skilled person on the basis of the disclosure herein is within the scope of the present application.

[0035] The minimum distance by which the casting needs to be separated from the bottom mold is usually the distance from the lowest part of the casting to the highest part of the mold core of the bottom mold, which is generally 20-40 mm.

[0036] Embodiment:

[0037] Reference Figures 1-5 As shown in the figure, the top material device of the embodiment includes a top plate assembly 8, a plurality of sliders 6, a plurality of slider fixing blocks 5, a plurality of springs 7, a plurality of top mold inclined rods 3, a plurality of bottom mold inclined rods 4, a plurality of top rods 9, and a plurality of reset rods 10; wherein,

[0038] One end face of the slider body is provided with a second inclined surface A62, and a through hole 61 is formed in the slider body, the axis of the through hole is parallel to the end face, and a first inclined surface A63 is provided on the inner side wall of the through hole; the end face where the second inclined surface A is located and the inner side face where the first inclined surface A is located are parallel;

[0039] The cavity is provided in the body of the slider fixing block, and a first hole and a second hole are formed in the body of the fixing block, the first hole communicates with the cavity, the second hole penetrates through the cavity and passes through the bottom of the cavity, and the axes of the first hole and the second hole are parallel;

[0040] The bottom end of the top mold inclined rod body is provided with a hook structure, and one side of the bottom surface of the hook is provided with a first inclined surface B; the bottom of the bottom mold inclined rod body is provided with a second inclined surface B;

[0041] The top material device of the present application is used in cooperation with the existing low-pressure machine and the top mold top material oil cylinder to complete mold opening and casting separation during use, and the specific installation method is that the top mold 1 and the bottom mold 2 in the top material device are closed together and then installed on the low-pressure machine, the bottom mold 2 is fixed with the bottom plate of the low-pressure machine, the top mold 1 is fixed with the top mold installation plate and the mold opening oil cylinder of the low-pressure machine, and the mold opening oil cylinder can move up and down, and the cavity in the middle of the assembled bottom mold and top mold is the mold cavity 11, which is the position for forming the casting.

[0042] The crucible furnace is communicated with the mold cavity through the riser pipe, and the riser sleeve is tightly attached to the riser pipe opening of the crucible furnace; the top plate assembly 8 is installed between the crucible furnace and the bottom mold, and the top plate assembly 8 is located around the bottom mold riser sleeve or the bottom mold riser sleeve passes through the top plate assembly 8;

[0043] According to the technical scheme of the present application, one end of each top mold inclined rod 3 is fixed with the top mold 1 and can move up and down with the opening and closing of the top mold; one end of each bottom mold inclined rod 4 is fixed with the bottom mold 2, and in the specific scheme, common fixing methods such as welding and bolt connection can be used;

[0044] A plurality of top rods 9 are installed on the top plate assembly 8, and a reset rod 10 is also installed at each of the positions close to the four corners of the top plate; the upper end of the top rod 9 contacts the casting cavity, and the upper end of the reset rod 10 contacts the mold parting surface.

[0045] The slider fixing block 5 of this embodiment is installed on the side surface of the four corners of the top plate assembly 8, the slider 6 is installed in the cavity of the slider fixing block and can move left and right, and the outer end of the slider 6 is installed with a reset spring 7;

[0046] The contact surfaces of the slider 6, the top mold inclined rod 3 and the bottom mold inclined rod 4 are all inclined surfaces, and the inclination angles of the respective contact inclined surfaces are different; at the same time, the bottom of the top mold inclined rod 3 is in the shape of a hook, which can hook the slider 6 and related components to move upward; the inclination angles of the respective inclined surfaces need to ensure the smooth operation of the device and the smooth realization of demolding and mold assembly; in this embodiment, the inclination angle a is 5 degrees, the inclination angle b is 75 degrees, and the inclination angle c is 60 degrees.

[0047] The working principle of the device is as follows:

[0048] (1) The top mold 1 and the bottom mold 2 are in a closed state, the metal liquid enters the mold cavity 11 from the riser pipe of the crucible furnace, fills the mold cavity 11 after filling, and forms a casting, and gradually cools and solidifies;

[0049] (2) The mold opening oil cylinder of the low-pressure machine drives the top mold 1 and the top mold inclined rod 3 to move upward; at the same time, the sliding action of the bottom mold inclined rod at each position (such as the four corners of the top plate assembly) and the end surface b (the second inclined surface A and B) of the slider, the sliding action of the curved hook surface of the top mold inclined rod 3 and the inclined surface a of the bottom surface of the slider 6, and the driving action of the curved hook make the slider 6 move in two directions, i.e., to the right (away from the bottom mold inclined rod) and upward; because the slider 6 is installed in the horizontal cavity of the slider fixing block 5, it also drives the upward movement of the slider fixing block 5, the top plate assembly 8, the top rod 9 and the reset rod 10; the plurality of evenly distributed top rods 9 make the casting gradually separate from the bottom mold 2 without deformation, and the reset spring 7 is in a gradually compressed state;

[0050] (3) After each slider 6 runs a distance to the right (the distance is designed by the hook extension size, and is also the minimum distance for the casting to be separated from the bottom mold, and the common minimum distance is 20-40 mm), the top mold inclined rod 3 is separated from the slider 6, at this time, the slider fixing block 5, the top plate assembly 8, the top rod 9 and the reset rod 10 simultaneously stop upward movement; the top mold 1 continues to move upward with the top mold inclined rod 3 and the casting, the top mold inclined rod is separated from the slider fixing block 5, and the reset spring 7 starts to push the slider 6 to the left to return to contact with the bottom mold inclined rod 4 on two second inclined surfaces;

[0051] (4) After the top mold inclined rod 3 reaches the appropriate position, the low-pressure machine material receiving disc rotates to below the top mold, the top mold material ejection oil cylinder ejects the casting 11 to separate from the mold and falls on the material receiving disc, and the material receiving disc is withdrawn;

[0052] (5) After the casting is taken out, the top mold 1 moves downward with each top mold inclined rod 3, when moving to the side of the bottom hook of the top mold inclined rod 3 and the inclined surface c (the first inclined surfaces A and B) of the corresponding slider 6, the slider 6 will first move to the right to give way, and when the hook of the top mold inclined rod 3 is completely inserted below the slider 6, the slider 6 returns to the left under the action of the spring 7 to make the hook of the top mold inclined rod 3 hook the slider 6 again; at the same time, the parting surface of the top mold 1 contacts the end surface of the reset rod 10, presses the reset rod 10 to drive the top plate assembly 8, the top rod 9 and the slider fixing block 5 to move downward to the initial position described in step (1), until the mold is completely closed.

[0053] Repeat steps (1)-(5) to continuously produce castings; when a round of production is completed, the device is cleaned and lubricated to prepare for the next round of production, and all accessories do not need to be replaced within the service life (about 30,000 to 50,000 mold times).

[0054] The hook surface of the present application and the bottom surface of the slider are partially inclined (i.e. the hook surface and the partial surface of the bottom surface of the slider are both inclined), the contact inclined surface is a inclined pin sliding mechanism, which can convert the input motion in the vertical direction into the output motion in the horizontal direction, which is beneficial to the slider moving to the spring direction when the top mold inclined rod moves upward, and simultaneously drives the slider, the slider fixing block, the top plate assembly and the top rod to move upward; the bottom hook is separated from the slider.

[0055] The number of sliders, slider fixing blocks, top molds and reset rods is determined according to the size of the low-pressure casting mold equipment and the size of the casting area, and more sliders and their fixing blocks are needed to realize the material ejection function to ensure the stability of the work process in larger equipment. In the actual scheme, a suitable number can be selected according to the size of the equipment.

[0056] The structure and shape of the top plate assembly can be designed according to the actual low-pressure casting mold scene, facilitating the installation of each component of the ejecting device and realizing the ejecting function. An example is that the top plate assembly is assembled by two plate pieces, the top plate assembly is provided with a central through hole 81 accommodating a liquid lifting sleeve and a liquid lifting pipe, and the plurality of ejecting rods are distributed around the central through hole.

[0057] In specific schemes, the top die inclined rod 3, the bottom die inclined rod 4, the slide block fixing block 5 and the slide block 6 are all made of alloy steel with surface treatment, having high hardness and wear resistance, and the rest are made of ordinary hot work die steel such as H13.

[0058] The above examples are preferred examples of the present application, and equivalent replacements and combinations made by those skilled in the art on the basis of the disclosed range of the present application are all within the protection scope of the present application.

Claims

1. A low pressure casting device comprising a top mold (1) and a bottom mold (2), which form a mold cavity (11) inside when assembled and the top mold is above the bottom mold, characterized in that, Also include: The top plate assembly (8); Multiple sliders (6); the slider includes a slider body, a second slope A (62) is arranged on one end surface of the slider body, a through hole (61) is further arranged on the slider body, the axial direction of the through hole is parallel to the end surface, and a first slope A (63) is arranged on the inner side wall of the through hole; the end surface where the second slope A is located is parallel to the inner side surface where the first slope A is located; Multiple slider fixing blocks (5); the slider fixing block includes a fixing block body, the fixing block body is provided with a cavity, and a first hole and a second hole are arranged on the fixing block body, the first hole is communicated with the cavity, the second hole penetrates through the cavity and passes through the bottom of the cavity, and the axial directions of the first hole and the second hole are parallel; Multiple springs (7); Multiple top die inclined rods (3); the top die inclined rod includes a rod body, the bottom end of the rod body is provided with a hook structure, and the bottom surface of the hook structure is provided with a first slope B on one side; Multiple bottom die inclined rods (4); the bottom die inclined rod includes a body rod, and the bottom of the body rod is provided with a second slope B; Multiple top rods (9) and multiple reset rods (10); The top plate assembly (8) is arranged below the bottom die, one end of each top rod (9) is fixed on the top plate assembly, the other end penetrates through the bottom die and extends to the bottom of the mold cavity, and the multiple top rods are uniformly distributed at the bottom of the mold cavity; One end of each reset rod (10) is fixed on the top plate assembly, and the other end penetrates through the bottom die and contacts the parting surface of the top die; Multiple slider fixing blocks are fixed on the top plate assembly and are distributed on the front and rear sides of the top plate assembly; a slider is placed in the cavity of each slider fixing block, and the slider can move left and right in the cavity, and a spring is arranged between one end of the slider and the inner wall of the cavity, and the compression direction of the spring is along the movement direction of the slider; the first hole and the second hole are distributed along the movement direction of the slider, and the spring is located at the end close to the second hole; The top end of each bottom die inclined rod is fixed on the bottom die, and the distribution mode of the multiple bottom die inclined rods satisfies that the bottom end of each bottom die inclined rod extends into the cavity through the first hole at the position below the bottom die and is located at the same end as the second slope A of the slider, and the second slope B and the second slope A are matched; The top end of each top die inclined rod is fixed on the top die, and the distribution mode of the multiple top die inclined rods satisfies that the bottom end of each top die inclined rod extends into the cavity through the second hole at the position below the bottom die and penetrates through the through hole of the slider, the hook surface locally contacts the bottom surface of the slider, and in the process that the top die inclined rod penetrates through the through hole downward, the first slope B and the first slope A are matched; the part where the hook surface contacts the bottom surface of the slider is a slope contact; The extension size of the hook is the minimum distance that the casting needs to separate from the bottom die.

2. The low pressure casting apparatus according to claim 1, characterized by The inclination angles of the second slope A, the first slope A and the slope part where the hook surface contacts the bottom surface of the slider are different.

3. The low pressure casting apparatus according to claim 1, characterized by Two slider fixing blocks are installed on the front and rear sides of the top plate assembly.

4. The low pressure casting apparatus according to claim 1, characterized by The minimum distance that the casting needs to separate from the bottom die is 20-40 mm.

5. The low pressure casting apparatus according to claim 1, characterized by Four reset rods (10) are included, and the four reset rods are distributed at the four top corner positions of the top die parting surface.

6. The low pressure casting apparatus according to claim 1, characterized by The top plate assembly is assembled by two plate pieces, the top plate assembly is provided with a central through hole (81) for accommodating the lifting sleeve, and the multiple top rods are distributed around the central through hole.

7. The low pressure casting apparatus according to claim 1, characterized by Also included is a crucible furnace located below the lower die, and a top plate assembly located between the crucible furnace and the lower die.

8. The low pressure casting apparatus according to claim 1, characterized by Also included is a low pressure machine and a mold opening cylinder, the bottom die and the top surface are connected with the low pressure machine, and the top die is connected with the mold opening cylinder.

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