Lateral pressing type pull-rod-free die casting machine

Abstract

The invention discloses a side pressure type pull-rod-free die casting machine which comprises a base, a movable die plate, a fixed die plate, a die moving assembly, a die locking assembly and a die opening assembly, the fixed die plate is fixedly installed on the base, the movable die plate is driven by a die moving device to move along a guide rail installed on the base, and the die locking assembly comprises a die locking drive, a die locking wedge and a die locking wedge block. The mold opening assembly comprises a mold opening drive, a mold opening wedge and a mold opening wedge block, and the mold locking assembly and the mold opening assembly respectively form a wedging mechanism during mold closing or mold opening so as to wedge or take away the movable mold plate. The lateral mold locking mechanism is arranged, a traditional pull rod is omitted, the size of the fixed mold plate and the size of the movable mold plate are reduced, space and cost are saved, deformation of the fixed mold plate and the movable mold plate is reduced, the precision and the yield of products can be improved, and due to the fact that the weight of movable parts such as the movable mold plate is greatly reduced, the mold closing and opening speed can be effectively increased, and the machining period is shortened; and the production benefit is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding machines, die-casting machines and molding machines, and in particular relates to a side-pressure type tie-bar-free die-casting machine. Background Art

[0002] Most of the existing mold opening and closing devices are three-plate or two-plate structures with tie rods, that is, a head plate, a middle plate and a tail plate (two-plate type has no tail plate), the two ends of the tie rod are fixed on the head plate and the tail plate, or only fixed on the head plate, and the middle plate reciprocates along the tie rod. However, there are the following problems:

[0003] 1. The tie rod passes through each plate, which makes the plate structure bulky and complicated, increasing material and manufacturing costs;

[0004] 2. The pull rod is long and requires high precision, which makes it difficult and costly to manufacture. In addition, the pull rod is easily damaged by high force.

[0005] 3. The existence of the tie rod brings inconvenience to the mold installation and greatly limits the space for taking out the finished product;

[0006] 4. The tie rod is usually long, resulting in poor rigidity of the tie rod in bearing the clamping force.

[0007] In view of this, the present invention is proposed. Summary of the invention

[0008] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a side-pressure type tie-bar-free die-casting machine.

[0009] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0010] A side pressure type tie-bar-free die-casting machine comprises a base, a movable die plate, a fixed die plate, a die shifting assembly, a die locking assembly and a die opening assembly. The fixed die plate is fixedly mounted on the base, and the movable die plate is driven by a die shifting device to move along a guide rail mounted on the base.

[0011] The mold locking assembly includes a mold locking drive, a mold locking wedge, and a mold locking wedge block. When the movable mold plate and the fixed mold plate are molded together, the mold locking drive drives the mold locking wedge to move in a direction perpendicular to the moving direction of the movable mold plate, and gradually wedges the mold locking wedge with the mold locking wedge block to gradually press the movable mold plate on the back side of the movable mold plate until it is locked;

[0012] The mold opening assembly includes a mold opening drive, a mold opening wedge, and a mold opening wedge block. When the movable template and the fixed template are molded, the mold opening drive drives the mold opening wedge to move in a direction perpendicular to the moving direction of the movable template, and makes the mold opening wedge block gradually wedge with the mold opening wedge (wedge tight), so as to bring the movable template away from the fixed template on the back side of the movable template.

[0013] Furthermore, columns are provided on the base. There are two columns, which are respectively arranged on the left and right sides of the moving axis of the moving template. The mold clamping drive is installed on the columns, the mold clamping wedge block is installed on the back surface of the moving template, the mold opening drive is installed on the back surface of the moving template, and the mold opening wedge block is installed on the columns.

[0014] Furthermore, a U-shaped gantry is provided on the base. The gantry straddles the moving axis of the moving template. The mold clamping drive is installed on the columns, the mold clamping wedge block is installed on the back surface of the fixed template, the mold opening drive is installed on the back surface of the fixed template, and the mold opening wedge block is installed on the columns.

[0015] Furthermore, a plurality of mold clamping assemblies and mold opening devices are provided, and they are evenly distributed along the circumferential direction of the back side end of the moving template.

[0016] Furthermore, a plurality of mold clamping assemblies and mold opening devices are provided, and they are symmetrically or asymmetrically distributed along the back side end of the moving template;

[0017] The inclined wedge drive devices of the mold clamping assemblies and mold opening assemblies can be arbitrarily selected to be installed on the columns or the moving template, and the corresponding fixed wedge blocks of the mold clamping assemblies and mold opening assemblies are installed on the moving template or the columns.

[0018] Furthermore, the wedge angle between the mold clamping inclined wedge and the mold clamping wedge block is 0° to 30°, and the wedge angle between the mold opening inclined wedge and the mold opening wedge block is 0° to 30°.

[0019] Furthermore, it further includes an injection unit. The injection unit is installed on the base and is connected to the back side of the fixed template.

[0020] Furthermore, the mold moving assembly includes a motor and a screw. The motor is installed on the base, the motor is drivingly connected to the screw, and the screw is threadedly connected to the moving template.

[0021] Furthermore, the main bodies of the base, columns, and fixed template are all of concrete structure.

[0022] Furthermore, the main bodies of the base, gantry, and fixed template are all of concrete structure.

[0023] Furthermore, a fixed mold is installed inside the fixed template, and a moving mold is installed inside the moving template.

[0024] After adopting the above technical solutions, the present invention has the following beneficial effects compared with the prior art.

[0025] The present invention provides a lateral mold clamping mechanism, cancels the traditional tie rods, reduces the sizes of the fixed template and the moving template, saves space and cost, enhances the stiffness while reducing the deformation, is beneficial to improving the product precision and the finished product rate, and moreover, the weights of the moving parts such as the moving template are greatly reduced, which can effectively improve the mold closing and mold opening speeds, shorten the processing cycle, and is beneficial to improving the production efficiency.

[0026] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the clamping assembly of the present invention;

[0030] Figure 3 It is a schematic diagram of the mold opening assembly of the present invention;

[0031] Figure 4 It is a schematic diagram of the concrete base and columns of the present invention;

[0032] Figure 5 This is a schematic diagram of the overall structure of the base and the column of the present invention;

[0033] Figure 6 It is a schematic diagram of the template of the present invention;

[0034] Figure 7 It is a schematic diagram comparing the areas of the template of the present invention and the traditional template.

[0035] In the figure:

[0036] 1-base; 2-movable template; 3-fixed template; 11-column; 21-movable mold; 31-fixed mold;

[0037] 401-locking drive; 402-locking wedge; 403-locking wedge;

[0038] 501-mold opening drive; 502-mold opening wedge; 503-mold opening wedge block; 504-mold opening push plate;

[0039] 6-mold shifting assembly; 7-injection unit; 8-guide rail.

[0040] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0042] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions 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 device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0043] 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 or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Embodiment 1

[0045] like Figures 1 to 7 As shown, the side pressure type tie-bar-less die-casting machine described in this embodiment includes a base 1, a movable die plate 2, a fixed die plate 3, a column 11, a die shifting assembly, a die locking assembly, a die opening assembly, and an injection unit 7. The fixed die plate 3 is fixedly mounted on the base 1, and a fixed die 31 is mounted on the fixed die plate 3, and a movable die 21 is mounted on the movable die plate 2. A guide rail 8 is provided on the base 1, and the movable die plate 2 is driven by the die shifting assembly 6 to slide along the guide rail 8, and the die shifting assembly 6 is driven to complete the rapid movement of mold closing and mold opening. The injection unit is mounted on the base 1 and connected to the back side of the fixed die plate 3.

[0046] A column 11 is provided on the base 1. The column 11 is a supporting component when the clamping force and the opening force act on the movable template 2, and bears the reverse force of the clamping / opening force. There is at least one column 11, which is usually fixed in pairs and symmetrically on both sides of the movable template 2. In this example, there are two columns 11, which are respectively arranged on the left and right sides of the moving axis of the movable template 2.

[0047] The mold locking assembly includes a mold locking drive 401, a mold locking wedge 402, and a mold locking wedge block 403. When the movable mold plate 2 and the fixed mold plate 3 are closed, the mold locking drive 401 drives the mold locking wedge 402 to move in a direction perpendicular to the movement of the movable mold plate 2, and gradually wedges the mold locking wedge 402 with the mold locking wedge block 403 to gradually press the movable mold plate 2 on the back side of the movable mold plate 2 until it is locked.

[0048] The mold opening assembly includes a mold opening drive 501, a mold opening wedge 502, and a mold opening wedge block 503. When the movable mold plate 2 and the fixed mold plate 3 are opened, the mold opening drive 501 drives the mold opening wedge 502 to move in a direction perpendicular to the movement of the movable mold plate 2, and causes the mold opening wedge block 503 to gradually wedge tightly with the mold opening wedge 502 to bring the movable mold plate 2 away from the fixed mold plate 3 on the back side of the movable mold plate 2.

[0049] When the movable template 2 moves to the mold closing position, the locking drive 401 device pushes the locking wedge 402 between the movable template 2 and the column 11. The thrust generated by the locking wedge 402 presses the movable template 2 toward the fixed template 3, thereby achieving strong mold locking. When opening the mold, the mold opening drive 501 pushes the opening wedge 502 between the movable template 2 and the column 11. The thrust generated by the opening wedge 502 pushes the movable template 2 away from the fixed template 3, thereby achieving strong mold opening.

[0050] As shown in the accompanying drawings, the difference between the mold locking assembly and the mold opening assembly is reflected in the different installation positions of the inclined wedge and the wedge block. The mold locking drive 401 is installed on the column 11, and the mold locking wedge block 403 is installed on the back of the fixed mold plate 2; the mold opening drive 501 is installed on the back of the fixed mold plate 2, sliding in the chamber formed between the mold opening push plate 504 and the movable mold plate 2, and the mold opening wedge block 503 is installed on the column 11. Since the wedging effects of the wedge block and the inclined wedge are two different effects of mold locking and mold opening, the directions of the wedge blocks need to correspond. In this example, both wedge blocks are close to the side of the movable mold plate 2, and the inclined wedge is on the side away from the movable mold plate 2. Of course, other methods can also be used as long as the two wedging purposes of mold locking and mold opening are met.

[0051] The column 11 here can also be replaced by other structures, such as a shaped door frame on the base 1, which spans the moving axis of the movable platen 2. The mold locking drive 401 is installed on the column 11, and the mold locking wedge 403 is installed on the back of the fixed platen 2; the mold opening drive 501 is installed on the back of the fixed platen 2, and the mold opening wedge 503 is installed on the column 11. The purpose can also be achieved. The column 11 or the door frame here provides a reaction force support mechanism on the back side of the mold closing position of the movable platen 2 to provide force support for the inclined wedge or wedge.

[0052] The locking / opening wedges are pressed from the side between the column 11 and the movable plate 2, and the side pressure is converted into a locking force or a mold opening force perpendicular to it through the wedge surface. The locking / opening wedges and the locking / opening wedge blocks are fixed on the column 11 and the movable plate 2 respectively. In this example, the locking wedges and the mold opening wedge blocks are installed on the column 11, and the mold opening wedges and the locking wedge blocks are installed on the movable plate 2, or vice versa, or the locking / opening wedges are both installed on the column 11, or both are installed on the movable plate 2. The locking / opening components can be specially arranged according to the different stress conditions of the products. Any number of locking components or mold opening components can be installed on each column 11, which can be symmetrical or asymmetrical, circumferentially evenly distributed, etc. The driving mode of the locking / opening wedges can also be other structural forms, including mechanical and hydraulic types. The formula for calculating the locking force is:

[0053]

[0054] Among them: F t1 is the thrust of the clamping drive, F a1 is the locking force generated by a single clamping wedge, n is the number of clamping components, is the friction angle between the inclined wedge and the column or the movable template 2, is the friction angle between the wedge surfaces, θ1 is the wedge angle of the clamping wedge, and the smaller θ1 is, the greater the force-enhancing effect of the clamping drive is.

[0055] The mold opening force is the vertical reaction force F' generated by the wedge surface when the mold opening wedge is pressed from the side. a2 , the mold opening wedge transmits the force to the mold opening push plate 504, and the mold opening push plate 504 makes the movable mold leave the fixed mold. The mold opening force calculation formula is:

[0056]

[0057] Among them: F t2 is the thrust of the mold opening drive device, F a2 is the mold opening force generated by a single mold opening wedge, m is the number of mold opening components, is the friction angle between the inclined wedge and the column or the movable template 2, is the friction angle between the wedge surfaces, θ2 is the wedge angle of the mold opening wedge, and the smaller θ2 is, the greater the force-enhancing effect of the mold opening drive is.

[0058] It can be seen from the above formula that the size of the clamping force / opening force can be freely set by changing the side clamping / opening pressure, the number of clamping / opening components, and the wedge angle of the wedge block to adapt to different die-casting processes. Preferably, the wedge angle between the clamping wedge 402 and the clamping wedge block 403 is 0° to 30°, and the wedge angle between the opening wedge 502 and the opening wedge block 503 is 0° to 30°.

[0059] For molds of different thicknesses, when the mold closing position needs to be adjusted, there are two methods: one is to adjust the thickness of the wedge installed on the column or the moving platen 2, and the other is to adjust the installation position of the column on the frame. In addition, the base 1, the fixed platen 3, the column 11 or the door frame can all be made of concrete structure, which has higher strength and rigidity, see attached Figure 5-6 As shown in the figure, the column and the base are an integrated structure, and a steel plate is embedded in the interface position of the installation for connection or sliding. The production can also be completed directly on the site of use, saving transportation costs. It is not limited to conventional metal products and the cost is also lower.

[0060] The mold shifting assembly is a linear motion mechanism, which can be a cylinder, a screw-nut pair, and the number is not less than 1. If a screw-nut pair mechanism is used, the mold shifting assembly includes a motor and a screw. The motor is mounted on a base 1, the motor is connected to the screw drive, and the screw is screwed to the movable mold plate. The movable mold plate 2 is used to bear the weight of the movable mold and drive the mold to move along the guide rail 8. In order to reduce the weight of the moving parts, the plate thickness of the non-supporting and non-installing position can be reduced or even reduced to zero. Furthermore, the movable mold plate 2 can be designed as a whole with the movable mold 21, which can reduce one component.

[0061] Working order: the mold shifting assembly 6 drives the movable mold plate 2 to move to the mold closing position; the mold locking drive 401 presses the mold locking wedge 402 from the side, and the generated mold locking force presses the movable mold plate 2 and the fixed mold plate 3; after the injection is completed, the mold locking drive 401 withdraws the mold locking wedge 402 from the side; the mold opening drive 501 presses the mold opening wedge 502 from the side, and the generated strong mold opening force separates the movable mold plate 2 and the fixed mold plate 3, and then the mold opening drive 501 withdraws the mold opening wedge 502 from the side, and the mold shifting assembly 6 drives the movable mold plate 2 to continue to open the mold, so that the molded parts can be taken out.

[0062] Advantages of the side pressure tie-bar-less die casting machine of this embodiment:

[0063] 1. The tie rod is replaced by a column to bear the reaction force of the clamping force. The tie rod is cancelled, and the size of the fixed template and the movable template can be reduced to the same size as the distance between the columns: taking a 9,000-ton die-casting machine as an example, the outer dimensions of the template with a tie rod in the traditional structure are 4.1 (m) × 4.1 (m), and the distance between the tie rod columns is only 2.6 (m) × 2.6 (m). The structure of this embodiment cancels the tie rod, and the template size is only 2.6 (m) × 2.6 (m), saving nearly 60%, so the template structure size and weight can be greatly reduced;

[0064] 2. The expansion force on the mold plate during injection is in the center area, see the attached Figure 6-7The support position of the traditional structure is at the tie rod position of the four corners, which is far from the center. The structure of this embodiment has no tie rod, and the support position is closer to the center: taking a 9,000-ton die-casting machine as an example, the center distance between the two diagonal tie rods of the traditional model is about 4.45 (m), and the diagonal support position of the structure of this embodiment is about 2.74 (m). The deformation size of the template is proportional to the cube of the support point spacing, that is, the deformation is reduced by about 76%, which enhances the rigidity and improves the precision of the die-casting product;

[0065] 3. Combining the above two points, the weight of the moving platen can be reduced by more than 80%, the weight of the moving parts is reduced, the speed of opening and closing the mold can be increased, and the processing cycle of the product can be shortened;

[0066] 4. The tie rod is eliminated. The diameter of a single tie rod of a traditional 9,000-ton die-casting machine is about 550 mm, and the length is more than 3 m. The material cost is high and the processing is difficult. The structure of this embodiment can save the high material and processing costs of 4 tie rods;

[0067] 5. It is convenient for mold installation and product removal, and more convenient for automated production.

[0068] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the structure of this embodiment can make some changes or modify it into an equivalent embodiment with equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A side pressure type tie-bar-less die casting machine, characterized in that: It comprises a base (1), a movable die plate (2), a fixed die plate (3), a die shifting assembly (6), a die locking assembly, and a die opening assembly, wherein the fixed die plate (3) is fixedly mounted on the base (1), and the movable die plate (2) is driven by the die shifting assembly (6) to move along a guide rail (8) mounted on the base (1); The mold locking assembly comprises a mold locking drive (401), a mold locking wedge (402), and a mold locking wedge block (403). When the movable mold plate (2) and the fixed mold plate (3) are molded together, the mold locking drive (401) drives the mold locking wedge (402) to move in a direction perpendicular to the moving direction of the movable mold plate (2), and gradually wedges the mold locking wedge (402) with the mold locking wedge block (403) to gradually press the movable mold plate (2) on the back side of the movable mold plate (2) until it is locked; The mold opening assembly includes a mold opening drive (501), a mold opening wedge (502), and a mold opening wedge block (503). When the movable mold plate (2) and the fixed mold plate (3) are opened, the mold opening drive (501) drives the mold opening wedge (502) to move in a direction perpendicular to the movement direction of the movable mold plate (2), and causes the mold opening wedge block (503) to gradually wedge tightly with the mold opening wedge (502) to bring the movable mold plate (2) away from the fixed mold plate (3) on the back side of the movable mold plate (2).

2. A side pressure type tie-bar-less die casting machine according to claim 1, characterized in that: The base (1) is provided with two columns (11), which are respectively arranged on the left and right sides of the moving axis of the movable plate (2); the mold locking drive (401) is installed on the columns (11); the mold locking wedge block (403) is installed on the back of the fixed plate (2); the mold opening drive (501) is installed on the back of the fixed plate (2); and the mold opening wedge block (503) is installed on the columns (11).

3. The side pressure type tie-bar-less die casting machine according to claim 1, characterized in that: The base (1) is provided with a shaped door frame, which spans the moving axis of the movable template (2); the mold locking drive (401) is installed on the column (11); the mold locking wedge block (403) is installed on the back of the movable template (2); the mold opening drive (501) is installed on the back of the movable template (2); and the mold opening wedge block (503) is installed on the column (11).

4. The side pressure type tie-bar-less die casting machine according to claim 1, characterized in that: The mold locking components and mold opening devices are both multiple and symmetrically or asymmetrically distributed along the back side of the movable mold plate (2); The wedge drive devices of the mold locking assembly and the mold opening assembly can be arbitrarily arranged on the column or the movable platen, and the corresponding fixed wedge blocks of the mold locking assembly and the mold opening assembly are arranged on the movable platen or the column.

5. The side pressure type tie-bar-less die casting machine according to claim 1, characterized in that: The wedge angle between the mold locking wedge (402) and the mold locking wedge block (403) is 0° to 30°, and the wedge angle between the mold opening wedge (502) and the mold opening wedge block (503) is 0° to 30°.

6. The side pressure type tie-bar-less die casting machine according to claim 1, characterized in that: It also comprises an injection unit (7), which is mounted on the base (1) and connected to the back side of the fixed mold plate (3).

7. The side pressure type tie-bar-less die casting machine according to claim 1, characterized in that: The mold moving assembly comprises a motor and a screw rod. The motor is mounted on a base (1). The motor is drivingly connected to the screw rod, and the screw rod is screwed to the movable mold plate.

8. The side pressure type tie-bar-less die casting machine according to claim 2, characterized in that: The main bodies of the base (1), the columns (11) and the fixed formwork (3) are all concrete structures.

9. The side pressure type tie-bar-less die casting machine according to claim 2, characterized in that: The main bodies of the base (1), the door frame and the fixed template (3) are all concrete structures.

10. The side pressure type tie-bar-less die casting machine according to claim 1, characterized in that: A fixed mold (31) is installed on the inner side of the fixed mold plate (3), and a movable mold (21) is installed on the inner side of the movable mold plate (2).

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