Injection synchronous vacuumizing device for die casting machine
A simplified vacuum system for casting machines synchronizes vacuum extraction with material injection, addressing operational complexity and cost issues while improving product quality and reducing defects.
Patent Information
- Application Number
- CN202421891125.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-06
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-08-06
AI Technical Summary
The vacuum extraction equipment of traditional die-casting machines has complex structure, high cost and high operation difficulty, making it difficult to effectively vacuum at the right time, resulting in finished product quality defects such as hollows and pores.
A synchronous vacuum evacuation device for press injection is designed, which drives the cylinder piston rod to move through the feeding piston rod, so that the metal liquid is charged into the mold cavity and vacuum is performed while evacuating. The gas flow is controlled by a check valve, which simplifies the equipment structure and synchronously completes the press injection and vacuum evacuation process.
It realizes natural synchronization of compression injection and vacuum evacuation, reduces equipment costs, ensures the quality of finished products, avoids defects such as hollows and pores, and is simple and reliable in operation.
Smart Images
Figure CN223097971U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of die-casting machine equipment, and particularly relates to a shot-synchronization vacuum pumping device for a die-casting machine. Background Art
[0002] A die-casting machine is an industrial casting machine that injects molten metal into a mold under pressure for cooling and forming to quickly manufacture metal castings with complex shapes and high precision, and is widely used in multiple industries such as automobiles, aerospace, electronic equipment, and household appliances. A die-casting machine consists of multiple parts such as a mold clamping mechanism, a shot mechanism, a hydraulic system, and an electric control system. It can produce continuously with high production efficiency, and at the same time, the products have high precision and strong material utilization rate, showing strong adaptability and flexibility, and is an important and indispensable device in modern industrial production.
[0003] High pressure and high speed are the main characteristics of the die-casting process. The commonly used filling pressure is as high as dozens of megapascals, the filling speed (gate speed) is about 16 - 80 m / s, and the time for the molten metal to fill the mold cavity is about 0.01 - 0.2 s. However, due to the very fast filling speed of the die-casting process, the air remaining in the cavity has a significant impact on filling, solidification, and the quality of the finished product. In the filling stage, the back pressure of the air in the cavity causes the filling pressure and energy consumption to increase. Seriously, it may even lead to difficulties in filling the melt, resulting in insufficient injection volume or even inability to fill the cavity. In the solidification stage, a part of the air will dissolve in the molten metal. If the dissolved air cannot be completely discharged in time during the solidification process, it is very easy to cause quality defects such as cavities, pores, silver streaks, and loose structures in the finished product.
[0004] At present, a common method to solve the above problems is to evacuate the air in the cavity through a vacuum pumping device before die-casting. However, traditional vacuum pumping devices usually consist of complex devices such as vacuum pumps, pneumatic valves, pressure sensors, control units, and gas storage tanks, with relatively high equipment and operation costs; moreover, due to the relatively complex structure of the equipment and large operation difficulty, it is very difficult for workers to grasp the accurate timing of vacuum pumping, which easily leads to an insignificant actual effect of vacuum pumping. Therefore, it is necessary to design a die-casting machine vacuum pumping device with a relatively simple structure, stable and reliable working process, and easy operation. Summary of the Utility Model
[0005] The utility model provides a shot-synchronizing vacuum pumping device for a die-casting machine, which specifically includes four parts: a mold-closing device, a shot system, a vacuum pumping system, and an exhaust system; the mold-closing device includes a fixed mold, a movable mold, a fixed mold plate, and a movable mold plate. The shot system includes a charging oil cylinder, a connecting piece, a charging piston rod, a charge bucket, a punch, and a punch rod. The vacuum pumping system includes a cylinder, a cylinder piston rod, a vacuum pipeline B, and a check valve B. The exhaust system includes a vacuum pipeline A, a muffler, and a check valve A. The charging oil cylinder is relatively fixed to the fixed mold plate, and the right end of the charging oil cylinder is successively connected to the charging piston rod, the connecting piece, and the punch; the charging oil cylinder is relatively fixed to the cylinder; the charge bucket is located on the side of the fixed mold plate; the charging piston rod and the punch rod are fixed at both ends of the connecting piece; the upper part of the connecting piece is connected to the cylinder piston rod; the cylinder piston rod is connected to the cylinder; the rodless cavity of the cylinder is connected to the vacuum pipeline A; the vacuum pipeline A is equipped with a muffler and a check valve A; the punch is located inside the charge bucket, and a feed port is opened at the upper end of the charge bucket. During the die-casting process, the punch moves forward to take a certain amount of material from the charge bucket and aligns it with the mold cavity on the fixed mold plate, and presses the material into the mold cavity; the fixed mold is installed on the side of the fixed mold plate; the movable mold is installed on the side of the movable mold plate; the movable mold cooperates with the fixed mold under the drive of the die-casting machine to form a mold cavity through the opening and closing actions; a vacuum pipeline B is connected to the rodless cavity of the cylinder at the parting surface of the fixed mold and the movable mold; the vacuum pipeline B is equipped with a check valve B.
[0006] After mold closing, the charging piston rod drives the cylinder piston rod and the punch to move to the right, pushing the molten metal in the charge barrel into the cavity; at the same time, the charging piston rod 5 drives the cylinder piston rod to move to the right, generating a vacuum in the rodless cavity of the cylinder, and the air originally located in the charge barrel and the cavity is sucked into its rodless cavity by the cylinder through the vacuum pipeline B. During the shot process, the check valve B is opened and the check valve A is closed, so that when the gas in the mold is pumped out, external air will not be sucked in, achieving the effect of shot-synchronizing vacuum pumping.
[0007] During the exhaust process, the check valve A is opened and the check valve B is closed, and the cylinder piston rod moves to the left, discharging the residual gas collected in the cylinder successively through the vacuum pipeline A, the check valve A, and the muffler.
[0008] Compared with the prior art, the advantages of the utility model are as follows:
[0009] 1) It solves the problems of high cost and difficulty in grasping the vacuum pumping timing of the traditional vacuum pumping device;
[0010] 2) By driving the cylinder piston rod to move with the charging piston rod, while the material is filled into the mold cavity, the cylinder piston rod pumps the cylinder to a vacuum state, and the residual gas in the mold cavity enters the cylinder through the pipeline and the check valve, realizing shot and vacuum pumping simultaneously;
[0011] 3) The device has a simple structure and low cost. Brief Description of the Drawings
[0012] Figure 1 This is a schematic structural diagram of the device of the present utility model.
[0013] Figure 2 This is a schematic diagram of the die-casting preparation state of the device of the present utility model.
[0014] Description of the Reference Numerals in the Drawings:
[0015] 1. Stripping oil cylinder; 2. Cylinder; 3. Cylinder piston rod; 4. Connector; 5. Stripping piston rod; 6. Barrel; 7. Punch; 8. Fixed mold; 9. Moving mold; 10. Fixed mold plate; 11. Moving mold plate; 121. Pipe A; 122. Pipe B; 13. Muffler; 141. Check valve A; 142. Check valve B; 15. Punch rod; 16. Feed port. Detailed Embodiment
[0016] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.
[0017] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so as to describe the embodiments of the present utility model here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0018] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.
[0019] The present utility model will be further described in detail below in conjunction with the drawings and specific embodiments.
[0020] As Figure 1 shown, a shot-synchronized vacuum pumping device for a die-casting machine specifically includes a die-clamping device, a shot system, a vacuum pumping system, an exhaust system, and four parts.
[0021] The die-clamping device includes a fixed die 8, a moving die 9, a fixed template 10, and a moving template 11.
[0022] The fixed die 8 is fixedly installed on the fixed template 10, and the moving die 9 is fixedly installed on the moving template 11; during the die-clamping process, as Figure 1 shown, through the horizontal movement of the moving template 11, the fixed die 8 and the moving die 9 are brought close together, and the hollow area formed by the two enclosures is the mold cavity. The die-casting cavity is connected to the material barrel 6 through a feed port, and a pipeline B122 is connected to the upper part of the mold cavity.
[0023] The shot system includes a charging cylinder 1, a connecting piece 4, a material barrel 6, a punch 7, and a punch rod 15. The connecting piece 4 includes a cylindrical main body structure and a transverse pull rod extending from the cylindrical main body structure. The charging piston rod 5 of the charging cylinder 1 extends from the right side, passes through the cylindrical main body structure of the connecting piece 4, and is fixedly connected to the punch rod 15, which is fixedly connected to the punch 7; as the charging cylinder 1 extends and retracts, the punch 7 moves forward or backward in the material barrel 6.
[0024] As Figure 2 shown, when the die-casting machine is in the die-casting preparation state, the punch 7 is located at the leftmost side of the material barrel 6. At this time, the casting metal liquid is injected into the material barrel 6 through the feed port 16 opened at the upper end of the material barrel 6.
[0025] The vacuum pumping system includes a cylinder 2, a vacuum pipeline B122, and a check valve B142.
[0026] The cylinder 2 is fixedly connected to the cylinder body structure of the charging cylinder 1, and the cylinder piston rod 3 of the cylinder 2 is connected to the transverse pull rod of the connecting piece 4 through a hinge; one side of the rodless cavity of the cylinder 2 is connected to the casting cavity through the pipeline B122 in sequence via the check valve B142, and the other side is connected to the exhaust system.
[0027] The exhaust system includes a vacuum pipeline A121, a muffler 13, and a check valve A141; the pipeline A121 is connected to the check valve A141 and the muffler 13 in sequence.
[0028] The gas flow direction allowed by the check valve B142 is the intake direction of the rodless cavity of the cylinder 2;
[0029] The gas flow direction allowed by the check valve A141 is the exhaust direction of the rodless cavity of the cylinder 2.
[0030] Working process of the device in this embodiment:
[0031] (1) After the fixed mold 8 and the moving mold 9 are closed, the knockout cylinder 1 is in the retracted state, the punch 7 is at the leftmost side of the ladle 6, and the casting metal liquid is injected into the ladle 6 through the feeding port 16 opened at the upper end of the ladle 6;
[0032] (2) The knockout cylinder 1 is quickly adjusted to the extended state. Driven by the knockout piston rod 5 and the punch rod 15, the punch 7 makes a rapid forward movement in the ladle 6. At the same time, the connecting piece 4 drives the cylinder piston rod 3 of the cylinder 2 to make an extended movement, generating negative pressure in the rodless cavity of the cylinder 2, and further exhausting the air in the mold cavity through the pipeline B122;
[0033] (3) When the knockout piston rod 5 of the knockout cylinder 1 moves to the limit position, the cylinder 2 stops the air extraction operation of the mold cavity, and the one-way valve B142 prevents the air in the rodless cavity of the cylinder 2 from flowing back to the mold cavity. The metal liquid in the mold cavity solidifies and forms, obtaining the final die-casting product.
[0034] (4) After die-casting is completed, the knockout piston rod 5 of the knockout cylinder 1 drives the cylinder piston rod 3 of the cylinder 2 to move in the reverse direction, and the air in the rodless cavity of the cylinder 2 is discharged through the muffler 13 at the tail of the cylinder 2.
[0035] Compared with the prior art, the advantages of the present utility model are as follows:
[0036] (1) The injection and vacuum extraction actions of the die-casting machine are naturally synchronized, solving the problems of high cost of traditional vacuum extraction devices and difficulty in grasping the vacuum extraction timing;
[0037] (2) The injection rate of the metal liquid and the air extraction rate in the mold cavity are in a linear relationship. In other words, the faster the injection speed, the faster the air extraction speed, avoiding the problems of increased filling pressure and difficult filling caused by backpressure;
[0038] (3) The power for vacuum extraction of the mold cavity comes from the knockout cylinder 1, without the need to additionally increase complex equipment such as pressure sensors, control units, and gas storage tanks.
[0039] In order to ensure that the air extraction rate in the mold cavity meets the requirements, the cylinder diameter of the cylinder 2 is larger than that of the knockout cylinder 1. Preferably, the cylinder diameter of the cylinder 2 is 1.2 - 1.5 times that of the knockout cylinder 1.
[0040] Unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience in description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.
[0041] For the sake of convenience in description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used here to describe the spatial positional relationship of one device or feature shown in the drawings with other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.
[0042] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" etc. are generally based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary statements, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.
[0043] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A shot-synchronizing vacuum pumping device for a die-casting machine, characterized in that, It includes a die clamping device, an injection system, a vacuum pumping system and an exhaust system; the die clamping device includes a fixed die (8), a moving die (9), a fixed template (10) and a moving template (11); the injection system includes a charging oil cylinder (1), a connecting piece (4), a barrel (6), a punch (7) and a punch rod (15); the connecting piece (4) includes a cylindrical main body structure and a transverse pull rod extending from the cylindrical main body structure; the charging piston rod (5) of the charging oil cylinder (1) extends from the right side, passes through the cylindrical main body structure of the connecting piece (4) and is fixedly connected to the punch rod (15), and the latter is fixedly connected to the punch (7); the vacuum pumping system includes a cylinder (2), a vacuum pipeline B (122) and a check valve B (142); the cylinder body structure of the cylinder (2) is fixedly connected to the cylinder body structure of the charging oil cylinder (1), and the cylinder piston rod (3) of the cylinder (2) is hinged to the transverse pull rod of the connecting piece (4); one side of the rodless cavity of the cylinder (2) is connected to the casting cavity through the pipeline B (122) in sequence after connecting the check valve B (142), and the other side is connected to the exhaust system; the exhaust system includes a vacuum pipeline A (121), a muffler (13) and a check valve A (141); the pipeline A (121) is connected to the check valve A (141) and the muffler (13) in sequence.
2. The injection synchronizing vacuum pumping device for a die casting machine according to claim 1, wherein The cylinder diameter of the cylinder (2) is larger than that of the charging oil cylinder (1); the cylinder diameter of the cylinder (2) is 1.2 - 1.5 times that of the charging oil cylinder (1).
3. The injection and synchronous vacuum pumping device for a die-casting machine according to claim 1, characterized in that, The gas flow direction allowed by the check valve B (142) is the intake direction of the rodless cavity of the cylinder (2); the gas flow direction allowed by the check valve A (141) is the exhaust direction of the rodless cavity of the cylinder (2).