Injection apparatus for casting processing

Abstract

The utility model relates to the technical field of injection equipment, and disclose a kind of injection equipment for casting processing, including movable mould base plate, the right side of movable mould base plate is connected with mounting plate, the right side of mounting plate is connected with ejector, the right side of ejector is provided with movable mould, the right side of movable mould is provided with static mould, and the static mould and movable mould form runner between, the right side of static mould is provided with static mould base plate, the static mould and static mould base plate are inserted with compression chamber, the top of compression chamber is provided with gate, the inner side right end of gate is inserted with injection punch, the right end of injection punch is connected with big oil cylinder.The utility model is provided with small oil cylinder and big oil cylinder, and two oil cylinders in big and small are used to drive injection punch in series, big cylinder is responsible for high-speed propulsion, and small cylinder provides additional boost pressure in the last section of injection, so that the boost pressure of the last section of injection is significantly improved without increasing the power of main pump, so that the casting is more dense, and it is especially suitable for thick-walled part production.

Description

Technical Field

[0001] This utility model relates to the field of injection equipment technology, specifically an injection device for casting processing. Background Technology

[0002] Injection is a key process in die casting where molten metal is injected at high speed into the mold cavity. The hydraulic energy of the injection system drives the punch to deliver the molten metal, which directly affects the quality of the casting. Injection equipment is used in casting processing.

[0003] Traditional injection molding equipment for casting typically uses a single hydraulic cylinder for operation. However, the pressure build-up at the end of the injection process is not fast enough, resulting in insufficient forming force for thick-walled castings that require high dynamic pressure. Therefore, there is an urgent need for an injection molding device for casting to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide an injection device for casting processing, in order to solve the problem mentioned in the background art that the traditional injection device for casting processing usually uses a traditional single hydraulic cylinder drive, which does not build up pressure quickly enough at the end of the injection process, resulting in insufficient forming force for thick-walled castings that require high dynamic pressure.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An injection device for casting processing includes a moving mold base plate, a mounting plate connected to the right side of the moving mold base plate, an ejector connected to the right side of the mounting plate, a moving mold disposed to the right side of the ejector, a stationary mold disposed to the right side of the moving mold, a sprue formed between the stationary mold and the moving mold, a stationary mold base plate disposed to the right side of the stationary mold, a pressure chamber inserted into the stationary mold and the stationary mold base plate, a gate opening at the top of the pressure chamber, an injection punch inserted into the inner right end of the gate, a large hydraulic cylinder connected to the right end of the injection punch, a first slider connected to the bottom of the large hydraulic cylinder, limit plates disposed on both the front and rear sides of the first slider, a connecting block connected to the right end of the large hydraulic cylinder, a support platform connected to the bottom of the two limit plates, a fixing block mounted on the upper right end of the support platform, a small hydraulic cylinder mounted on the top of the fixing block, and the piston rod of the small hydraulic cylinder connected to the right end of the connecting block.

[0006] In a preferred embodiment of this invention, the bottom of the connecting block contacts the upper surface of the support platform, but they are not connected.

[0007] In a preferred embodiment of this invention, the front and rear sides of the connecting block are in contact with one side wall of the two limiting plates, but are not connected to each other.

[0008] In a preferred embodiment of this invention, the front and rear sides of the first slider are in contact with one side wall of each of the two limiting plates, but are not connected to each other.

[0009] In a preferred embodiment of this invention, the bottom of the first slider is in contact with the upper surface of the support platform, but they are not connected.

[0010] As a preferred embodiment of this invention, the ejector pin is inserted into the moving mold and extends to the gating.

[0011] As a preferred embodiment of this invention, the injection punch can move horizontally within the pressure chamber.

[0012] In a preferred embodiment of this invention, the gate is located on the right side of the stationary mold base plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention uses a small hydraulic cylinder and a large hydraulic cylinder, which are connected in series to drive the injection punch. The large hydraulic cylinder is responsible for high-speed propulsion, while the small hydraulic cylinder provides additional boost pressure at the end of the injection process. This significantly increases the boost pressure at the end of the injection process without increasing the power of the main pump, resulting in denser castings, which is particularly suitable for the production of thick-walled parts. Attached Figure Description

[0014] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of an injection device for casting processing according to the present invention; Figure 2 This is a cross-sectional schematic diagram of the overall structure of an injection device for casting processing according to the present invention; Figure 3 This is a top view of the support platform, limiting plate, and first slider of an injection device for casting processing according to the present invention. Figure 4 This is a top view schematic diagram showing the positional relationship between the support platform and the limiting plate of an injection device for casting processing according to this utility model. Figure 5 This is a top view schematic diagram showing the positional relationship between the large oil cylinder, support platform, limiting plate, and first slider of an injection device for casting processing according to this utility model. Figure 6 This is a cross-sectional structural diagram of the pressure chamber of an injection device for casting processing according to the present invention.

[0015] In the diagram: 1. Moving mold base plate; 2. Mounting plate; 3. Ejector; 4. Moving mold; 5. Stationary mold; 6. Stationary mold base plate; 7. Sprue; 8. Pressure chamber; 9. Gate; 10. Injection punch; 11. Support platform; 12. Limiting plate; 13. First slider; 14. Large hydraulic cylinder; 15. Connecting block; 16. Small hydraulic cylinder; 17. Fixing block. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the utility model. Furthermore, it should be noted that, for ease of description, only the parts relevant to the utility model are shown in the accompanying drawings. In the embodiments of the present utility model, the different types of cross-sectional lines are not labeled according to national standards, nor do they specify material requirements for the components; they are used to distinguish the cross-sectional views of the components in the drawings.

[0017] Please see Figure 1-6 An injection molding device for casting processing includes a moving mold base plate 1, a mounting plate 2 connected to the right side of the moving mold base plate 1, an ejector 3 connected to the right side of the mounting plate 2, a moving mold 4 disposed to the right side of the ejector 3, a stationary mold 5 disposed to the right side of the moving mold 4, a sprue 7 formed between the stationary mold 5 and the moving mold 4, a stationary mold base plate 6 disposed to the right side of the stationary mold 5, a pressure chamber 8 inserted on the stationary mold 5 and the stationary mold base plate 6, a gate 9 opened at the top of the pressure chamber 8, an injection punch 10 inserted at the inner right end of the gate 9, a large hydraulic cylinder 14 connected to the right end of the injection punch 10, a first slider 13 connected to the bottom of the large hydraulic cylinder 14, and limiting devices on both the front and rear sides of the first slider 13. The right end of the positioning plate 12 and the large hydraulic cylinder 14 is connected to a connecting block 15. The bottom of the two limiting plates 12 is connected to a support platform 11. A fixing block 17 is installed on the upper right end of the support platform 11. A small hydraulic cylinder 16 is installed on the top of the fixing block 17. The piston rod of the small hydraulic cylinder 16 is connected to the right end of the connecting block 15. The small hydraulic cylinder 16 and the large hydraulic cylinder 14 are set up in series to drive the injection punch 10. The large hydraulic cylinder 14 is responsible for high-speed propulsion, and the small hydraulic cylinder 16 provides additional boost pressure at the end of the injection. This significantly increases the boost pressure at the end of the injection without increasing the power of the main pump, making the casting denser and particularly suitable for the production of thick-walled parts.

[0018] The bottom of the connecting block 15 is in contact with the upper surface of the support platform 11, but they are not connected.

[0019] The front and rear sides of the connecting block 15 are in contact with one side wall of the two limiting plates 12, but are not connected.

[0020] The front and rear sides of the first slider 13 are in contact with one side wall of the two limiting plates 12, but are not connected.

[0021] The bottom of the first slider 13 is in contact with the upper surface of the support platform 11, but they are not connected.

[0022] In this process, the ejector pin of the ejector 3 is inserted into the moving mold 4 and extends to the sprue 7.

[0023] The injection punch 10 can move horizontally within the pressure chamber 8.

[0024] Among them, the gate 9 is located on the right side of the stationary mold base plate 6.

[0025] The working principle and usage process of this utility model are as follows: First, the moving mold 4 moves to the left under the action of the driving device (not shown in the figure, usually driven by the mold closing cylinder), and tightly closes with the stationary mold 5 to form the casting cavity, i.e., the gating 7. Then, the molten metal is poured into the pressure chamber 8 from the gate 9. At this time, the injection punch 10 is located at the rightmost end of the pressure chamber 8, and the piston rods of the large cylinder 14 and the small cylinder 16 are in a retracted or standby state, slowly advancing to push the molten metal in the pressure chamber 8 to the left, so that it smoothly fills the pressure chamber 8. The front end space simultaneously discharges the gas in the pressure chamber 8 and prevents molten metal from splashing out from the gate 9. This stage is usually powered by the large hydraulic cylinder 14 alone. The piston rod of the large hydraulic cylinder 14 pushes the connecting block 15 and the injection punch 10 to move slowly to the left. In this stage, the small hydraulic cylinder 16 can be depressurized or its piston rod can be in a floating state. The connecting block 15 and the first slider 13 slide on the table surface of the support platform 11. Their back-and-forth movement is guided and constrained by two limiting plates 12 to ensure the straightness and stability of the movement trajectory. As the molten metal is about to enter the gating system 7, it is instantly accelerated, injecting the molten metal into the mold cavity at extremely high speed. This allows the molten metal to rapidly fill every part of the cavity before solidification. During this stage, the large hydraulic cylinder 14 works at full capacity, supplying high-pressure oil to its rodless chamber, generating a huge thrust. This thrust is transmitted through the connecting block 15 and applied entirely to the injection punch 10, propelling it to move to the left at high speed. The large hydraulic cylinder 14 is specifically designed to provide high speed and high flow rate, releasing a large amount of energy in a short time to accelerate the injection punch 10. At the instant the injection punch 10 reaches its leftmost position at high speed, the piston rod of the small hydraulic cylinder 16 extends rapidly, generating a huge forward thrust. This thrust acts directly on the connecting block 15. Since the left end of the connecting block 15 is connected to the piston rod of the large hydraulic cylinder 14, the right end... Connected to the piston rod of the small cylinder 16, the huge thrust generated by the small cylinder 16 will act in the opposite direction on the piston rod of the large cylinder 14 through the connecting block 15. At this time, the rodless chamber of the large cylinder 14 is usually locked by the high-pressure oil circuit. The thrust of the small cylinder 16 and the back pressure of the piston of the large cylinder 14 are superimposed in series and act on the molten metal that has not yet solidified through the injection punch 10. Although the small cylinder 16 has a small volume and small flow rate, its piston area is small, and it can generate extremely high output pressure under the same oil pressure. The injection punch is driven by two cylinders, one large and one small, in series. The large cylinder 14 is responsible for high-speed propulsion, and the small cylinder 16 provides additional boost pressure at the end of the injection. This significantly increases the boost pressure at the end of the injection without increasing the power of the main pump, making the casting denser and particularly suitable for the production of thick-walled parts. After the injection and holding pressure are completed, the system is depressurized. The small oil cylinder 16 returns first, and then the piston rod of the large oil cylinder 14 retracts, driving the injection punch 10 back to its initial position. The moving mold 4 moves to the right and separates from the stationary mold 5. The ejector 3 on the mounting plate 2 is activated, and its ejector pin extends forward and penetrates into the cavity of the moving mold 4, ejecting the cooled and formed casting and the material in the sprue 7 from the mold, completing one work cycle. The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0026] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the utility model involved in this application is not limited to the technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An injection device for casting processing, comprising a moving mold base plate (1), characterized in that: A mounting plate (2) is connected to the right side of the moving mold base plate (1), and an ejector (3) is connected to the right side of the mounting plate (2). A moving mold (4) is arranged to the right side of the ejector (3), and a stationary mold (5) is arranged to the right side of the moving mold (4). A sprue (7) is formed between the stationary mold (5) and the moving mold (4). A stationary mold base plate (6) is arranged to the right side of the stationary mold (5). A pressure chamber (8) is inserted on the stationary mold (5) and the stationary mold base plate (6). A gate (9) is opened at the top of the pressure chamber (8), and an injection punch (10) is inserted at the inner right end of the gate (9). A large hydraulic cylinder (14) is connected to the right end of the injection punch (10). A first slider (13) is connected to the bottom of the large hydraulic cylinder (14). Limiting plates (12) are provided on both the front and rear sides of the first slider (13). A connecting block (15) is connected to the right end of the large hydraulic cylinder (14). A support platform (11) is connected to the bottom of the two limiting plates (12). A fixing block (17) is installed on the upper right end of the support platform (11). A small hydraulic cylinder (16) is installed on the top of the fixing block (17). The piston rod of the small hydraulic cylinder (16) is connected to the right end of the connecting block (15).

2. The injection device for casting processing according to claim 1, characterized in that: The bottom of the connecting block (15) is in contact with the upper surface of the support platform (11), but they are not connected.

3. The injection device for casting processing according to claim 1, characterized in that: The front and rear sides of the connecting block (15) are in contact with one side wall of the two limiting plates (12), but are not connected.

4. The injection device for casting processing according to claim 1, characterized in that: The front and rear sides of the first slider (13) are in contact with one side wall of the two limiting plates (12), but are not connected.

5. The injection device for casting processing according to claim 1, characterized in that: The bottom of the first slider (13) is in contact with the upper surface of the support platform (11), but not connected to it.

6. The injection device for casting processing according to claim 1, characterized in that: The ejector pin of the ejector (3) is inserted into the moving mold (4) and extends to the sprue (7).

7. The injection device for casting processing according to claim 1, characterized in that: The injection punch (10) can move horizontally within the pressure chamber (8).

8. The injection device for casting processing according to claim 1, characterized in that: The gate (9) is located on the right side of the stationary mold base plate (6).

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