Plunger oil injection structure

Abstract

The invention provides a plunger oil injection structure which is used in a die-casting machine, the die-casting machine comprises a die cavity, a material pipe, a plunger head and an injection rod, the plunger head is connected with the injection rod, the oil injection structure comprises an oil way, the oil way is arranged in the injection rod, an oil injection port of the oil way is formed in the surface of the end, away from the plunger head, of the injection rod, and the oil injection port of the oil way is connected with the plunger head. An oil injection hole of the oil pipe is formed in the surface of the end, close to the plunger head, of the injection rod and used for injecting oil. Plunger oil can be evenly sprayed into the material pipe, good lubrication is kept between the plunger head and the material pipe, local friction is reduced, the service life of the plunger head and the service life of the material pipe are prolonged, meanwhile, the use amount of the plunger oil can be reduced, pollution is reduced, and the defects that due to direct contact between the plunger oil and molten metal, fire breaks out, and air holes are formed in a die casting are avoided.

Description

[Technical field]

[0001] The invention relates to the technical field of die-casting production process, in particular to a plunger oil injection structure. [Background technology]

[0002] When using a die-casting mold to produce die-cast products, after the molten metal is poured into the material tube 10, the end of the shooting rod 20 with the plunger head 30 is usually used to push the metal in the material tube 10 into the die cavity 40 of the die-casting machine, thereby forming a metal workpiece. The temperature of the metal in the material tube 10 is generally around 670°C, and the temperature of the material tube 10 will reach around 150°C after heat conduction. In order to reduce friction, the plunger head 30 needs to be lubricated with oil. The existing oiling methods are generally divided into two types: Figure 1 The drawing shows an oil injection method in which the plunger oil is directly sprayed onto the top of the plunger head 30 through the oil spray pipe 60. The disadvantages of this method are: 1. If too little oil is sprayed, it cannot be dispersed to the entire circle of the plunger head 30, resulting in poor lubrication effect, causing severe local friction and jamming, and reducing the service life of the plunger head 30 and the material tube 10; 2. If too much oil is sprayed, the excess oil is easy to drip onto the table of the die-casting machine, and even flow onto the ground, causing the table and ground of the die-casting machine to be dirty and affecting the working environment. Figure 2 Another oil injection method is shown, which is to use an oil injection pipe 60 to spray oil to the front of the plunger head 30 in the material pipe 10. The disadvantages of this method are: 1. If the oil is sprayed too little, it cannot penetrate the entire circle of the plunger head 30 and the material pipe 10, and cannot achieve a good lubrication effect, which eventually leads to severe local friction and jamming, and reduces the service life of the plunger head 30 and the material pipe 10; 2. If the oil is sprayed too much, the molten metal liquid is easily ignited and generates gas after being poured into the material pipe 10. The gas will enter the mold cavity 40 with the metal liquid, resulting in poor porosity of the product.

[0003] In view of this, the present invention provides a plunger oil injection structure to solve the above problems. [Summary of the invention]

[0004] In order to solve the problems that when the plunger head is lubricated by oil spraying in the prior art, uneven oil spraying may occur, resulting in poor lubrication effect, reducing the service life of the plunger head and the material pipe, or excessive oil spraying may cause contamination of the work surface, or even cause fire between the plunger head and the molten metal, the present invention provides a plunger oil spraying structure to solve the above problems.

[0005] The solution to the technical problem of the present invention is: a plunger oil injection structure, used in a die casting machine, the die casting machine includes a die cavity, a material pipe, a plunger head and a shooting rod, the plunger head is connected to the shooting rod, the plunger head is used to extend into the material pipe to push the molten metal in the material pipe to the die cavity, the injection structure includes:

[0006] The oil circuit is arranged in the shooting rod, the oil filling port of the oil circuit is opened on the end surface of the shooting rod away from the plunger head for oil filling, and the oil injection hole of the oil circuit is opened on the end surface of the shooting rod close to the plunger head for oil injection.

[0007] Preferably, the oil circuit includes a first oil circuit and a second oil circuit, there are a plurality of second oil circuits, the plurality of second oil circuits are intersected and evenly distributed inside the shooting rod near one end of the plunger head, and the first oil circuit is perpendicular to the plurality of second oil circuits and intersects at the intersection between the second oil circuits.

[0008] Preferably, there are two second oil circuits, and the two second oil circuits are connected to the first oil circuit at the intersection point after they intersect each other perpendicularly, thereby forming four evenly distributed oil injection holes on the surface of the shooting rod near one end of the plunger head.

[0009] Preferably, the diameter of the oil injection hole can be designed according to the diameter of the material pipe.

[0010] Preferably, the diameter of the oil injection hole is 5-8 mm.

[0011] The beneficial effect of the present invention is that the present invention can make the plunger oil spray evenly in the material tube, so that the plunger head and the material tube are well lubricated, reduce local friction, and extend the service life of the plunger head and the material tube. At the same time, it can save the use of plunger oil and reduce pollution, and avoid the fire caused by direct contact between the plunger oil and the metal liquid, the generation of pores in the die casting and other defects.

Brief Description of the Drawings

[0012] Figure 1 The present invention is a schematic diagram of a plunger head oil filling method in the prior art.

[0013] Figure 2 It is a schematic diagram of another plunger head oil filling method in the prior art.

[0014] Figure 3 The present invention is a schematic diagram of a plunger oil injection structure.

[0015] Figure 4 The utility model is a schematic diagram of the use state of a plunger oil injection structure of the present invention. [Specific implementation method]

[0016] To further illustrate the technical means and effects adopted by the present invention, the following is a detailed description in conjunction with the embodiments of the present invention and the accompanying drawings.

[0017] The present invention provides a plunger oil injection structure, which is used in a die-casting machine. The die-casting machine includes a die cavity 4, a material pipe 1, a plunger head 3 and a shooting rod 2. The plunger head 3 is connected to the shooting rod 2. The plunger head 3 is used to extend into the material pipe 1 to push the molten metal in the material pipe 1 to the die cavity 4. The injection structure includes:

[0018] The oil circuit 5 is arranged in the shooting rod 2, the oil filling port 500 of the oil circuit 5 is opened on the end surface of the shooting rod 2 away from the plunger head 3, and is used to connect with the oil pump for oil filling, and the oil injection hole 510 of the oil circuit 5 is opened on the end surface of the shooting rod 2 close to the plunger head 3 for oil injection.

[0019] Among them, the oil circuit 5 includes a first oil circuit 50 and a second oil circuit 51, there are a plurality of second oil circuits 51, and the plurality of second oil circuits 51 are crossed and evenly distributed inside the end of the shooting rod 2 close to the plunger head 3, and the first oil circuit 50 is perpendicular to the plurality of second oil circuits 51 and intersects at the intersection between the second oil circuits 51.

[0020] In a preferred embodiment, there are two second oil circuits 51, and the two second oil circuits 51 are connected to the first oil circuit 50 at the intersection point after they intersect each other perpendicularly, thereby forming four evenly distributed oil injection holes 510 for oil injection on the surface of the shooting rod 2 near the plunger head 3.

[0021] The diameter of the oil injection hole 510 can be designed according to the diameter of the material pipe 1 .

[0022] In a preferred embodiment, the diameter of the oil injection hole 510 can be 5-8 mm.

[0023] The working principle of the present invention is: after the injection pressure is completed, the shooting rod 2 drives the plunger head 3 to retreat, and the plunger oil is injected into the oil filling port 500 on the shooting rod 2 through an oil pump (not shown in the figure). The plunger oil flows through the first oil circuit 50 and the second oil circuit 51 and then is sprayed out from the oil injection hole 510. At this time, the shooting rod 2 drives the plunger head 3 to retreat, so that the plunger oil can be evenly sprayed between the inner wall of the material tube 1 and the plunger head 3, which has a good lubrication effect and can avoid direct contact between the plunger oil and the metal liquid.

[0024] The beneficial effect of the present invention is that the present invention can make the plunger oil spray evenly in the material tube 1, so that the plunger head 3 can maintain good lubrication with the material tube 1 when retreating after the injection pressure is completed, reducing local friction, extending the service life of the plunger head 3 and the material tube 1, saving the amount of plunger oil used, and avoiding pollution of the working environment. At the same time, since the plunger oil does not directly contact the high-temperature molten metal, it can avoid the occurrence of undesirable situations such as fire and the generation of pores in the die-casting.

[0025] It should be pointed out that the present invention is not limited to the above-mentioned implementation modes, and any simple modifications, equivalent changes and modifications made to the above-mentioned embodiments by any technician familiar with the profession based on the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A plunger oil injection structure, used in a die casting machine, the die casting machine comprises a die cavity, a material pipe, a plunger head and a shooting rod, the plunger head is connected to the shooting rod, characterized in that: The oil injection structure comprises: The oil circuit is arranged in the shooting rod, the oil filling port of the oil circuit is opened on the end surface of the shooting rod away from the plunger head, and the oil injection hole of the oil circuit is opened on the end surface of the shooting rod close to the plunger head for oil injection.

2. A plunger oil injection structure according to claim 1, characterized in that: The oil circuit includes a first oil circuit and a second oil circuit, there are a plurality of second oil circuits, the plurality of second oil circuits are intersected and evenly distributed inside the shooting rod near one end of the plunger, the first oil circuit is perpendicular to the plurality of second oil circuits and intersects at the intersection between the second oil circuits.

3. A plunger oil injection structure according to claim 2, characterized in that: There are two second oil circuits, and the two second oil circuits are connected to the first oil circuit at the intersection point after they intersect each other perpendicularly, thereby forming four evenly distributed oil injection holes on the surface of the shooting rod close to one end of the plunger head.

4. A plunger oil injection structure according to claim 1 or 3, characterized in that: The diameter of the oil injection hole can be designed according to the diameter of the material pipe.

5. A plunger oil injection structure as claimed in claim 1, 3 or 4, characterized in that: The diameter of the oil injection hole is 5-8 mm.

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