A piston skirt casting and quenching device

Abstract

The present application belongs to the technical field of piston blank casting, and particularly relates to a piston stop mouth casting and quenching device. The piston stop mouth casting and quenching device comprises a casting and quenching water tank, and is characterized in that: a casting and quenching support is arranged in the casting and quenching water tank, a stainless steel air pipe is installed in the middle of the casting and quenching support, and a plurality of pairs of air holes are uniformly arranged on the stainless steel air pipe. The piston stop mouth casting and quenching device has the beneficial effect that: the boiling phenomenon formed by the impact of compressed air on water liquid changes the fixed liquid surface into a fluctuating liquid surface, obviously reduces the water mark trace of the piston, and improves the quality level of the piston.

Description

Technical Field

[0001] This invention belongs to the field of piston blank casting technology, and specifically relates to a piston stop casting and quenching device. Background Technology

[0002] The piston stop casting and quenching process requires casting and quenching of the piston blank produced by the piston mold. Because this process only locally quenches the piston stop area, current water quality conditions—specifically, the relatively fixed liquid level of the cooling water—can cause Ca and Mg ions to detach and adhere to the piston surface during high-temperature casting and quenching. This results in white spots (watermarks) on the cooling water surface during casting and quenching. Therefore, pistons requiring stop casting and quenching (especially those from OEMs with stringent requirements) need to be finished using a finishing machine, which is time-consuming, labor-intensive, and costly. Improving the appearance quality of pistons and addressing the current situation of casting and quenching watermarks on piston blanks has become a major challenge for the piston industry. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the present invention provides a piston stop casting and quenching device.

[0004] This invention is achieved through the following technical solution: A piston stop casting and quenching device includes a casting and quenching water tank, characterized in that: a casting and quenching support is provided inside the casting and quenching water tank, a stainless steel air pipe is installed in the middle of the casting and quenching support, and several pairs of air holes are evenly opened on the stainless steel air pipe.

[0005] The air holes are symmetrically arranged on both sides of the upper part of the stainless steel air pipe, and the central angle formed by the line connecting the center lines of the two air holes is 60°.

[0006] The stainless steel gas pipe is equipped with an outlet sealing plate at its end.

[0007] A stainless steel water level regulating pipe is installed at the bottom of the casting and quenching water tank.

[0008] Several stainless steel support ribs are evenly installed on the top of the casting and quenching bracket.

[0009] A casting and quenching water tank support is installed at the bottom of the casting and quenching water tank.

[0010] The beneficial effects of this invention are: by utilizing the boiling phenomenon formed by the impact of compressed air on the water, the fixed liquid surface is transformed into a fluctuating liquid surface, which significantly reduces the watermark marks on the piston and improves the quality level of the piston. Attached Figure Description

[0011] The invention will now be further described with reference to the accompanying drawings.

[0012] Appendix Figure 1 This is a schematic diagram of the main structure of the casting and quenching water tank of the present invention; Appendix Figure 2This is a side view of the casting and quenching water tank structure of the present invention; Appendix Figure 3 This is a schematic diagram of the main structure of the casting and quenching support of the present invention; Appendix Figure 4 This is a top view of the casting and quenching support structure of the present invention; Appendix Figure 5 This is a schematic diagram of the stainless steel gas pipe inlet structure of the present invention; Appendix Figure 6 This is a schematic diagram of the cross-sectional structure of the stainless steel gas pipe of the present invention; In the diagram, 1 is the casting and quenching water tank, 2 is the casting and quenching support, 3 is the stainless steel air pipe, 4 is the air hole, 5 is the outlet sealing plate, 6 is the stainless steel water level regulating pipe, 7 is the stainless steel support rib, and 8 is the casting and quenching water tank support. Detailed Implementation

[0013] The attached figure illustrates a specific embodiment of the present invention. This embodiment includes a casting and quenching water tank 1, a casting and quenching support 2 within the tank 1, a stainless steel air pipe 3 installed in the center of the support 2, and several pairs of air holes 4 evenly distributed on the air pipe 3.

[0014] The air holes 4 are symmetrically arranged on both sides of the upper part of the stainless steel air pipe 3, and the central angle formed by the line connecting the center lines of the two air holes 4 is 60°.

[0015] The stainless steel gas pipe 3 is equipped with an outlet sealing plate 5 at its end. The casting and quenching water tank 1 is equipped with a stainless steel water level regulating pipe 6 at its lower part.

[0016] Several stainless steel support ribs 7 are evenly installed on the top of the casting and quenching support 2. A casting and quenching water tank support 8 is installed at the bottom of the casting and quenching water tank 1.

[0017] The piston blank casting and quenching device of this invention consists of a casting and quenching water tank support 8, a casting and quenching water tank 1, and a casting and quenching bracket 2. The casting and quenching bracket 2 is placed inside the casting and quenching water tank 1, and the piston blank is placed on the casting and quenching bracket 2. The casting and quenching bracket 2 controls the position of the piston blank on the liquid surface. Compressed air enters the stainless steel air pipe 3 and is ejected from the air hole 4 into the liquid below the surface. The amount of compressed air can be adjusted to change the degree of boiling water splash, so that the boiling and undulating liquid surface reaches the center of the piston blank pin hole, but does not exceed the center of the pin hole. After the liquid surface boils, it is ensured to be within ±5mm of the center line of the piston blank pin hole. A stainless steel water level regulating pipe 6 is connected to an external rubber tube. By draining and releasing water, the liquid level in the casting and quenching water tank 1 can be adjusted. By assisting in controlling the height requirement of the casting and quenching liquid level, the casting and quenching control of the piston blank can be achieved.

[0018] The piston stop casting and quenching device of this invention was tested as follows: The fluctuating liquid surface was positioned 5-10 mm above the center of the piston blank pin hole. Tests showed a significant reduction in watermarks, almost eliminating them entirely. However, the hardness values ​​varied considerably, mainly due to excessively high water levels and the manual mold riser being too close to the piston top. Because the main riser of the ring-inserted piston was large and close to the top, the hardness during casting and quenching was substandard. Raising the casting and quenching support 2 lowered the water level, allowing the boiling, fluctuating liquid surface to reach the center of the piston blank pin hole, but not exceeding it. After extracting test data from the piston, the hardness was within the process requirements, and the watermarks were significantly eliminated. Especially after heat treatment, the watermarks were virtually invisible, demonstrating excellent results, exceeding the Class A watermark standard, and showing a very significant improvement. Changing the fixed liquid surface to a fluctuating one dispersed the concentrated watermarks formed during casting and quenching, significantly reducing casting and quenching watermarks.

Claims

1. A piston stop casting and quenching device, comprising a casting and quenching water tank (1), characterized in that: The casting and quenching water tank (1) is equipped with a casting and quenching support (2), and a stainless steel air pipe (3) is installed in the middle of the casting and quenching support (2). Several pairs of air holes (4) are evenly opened on the stainless steel air pipe (3).

2. The piston stop casting and quenching device according to claim 1, characterized in that: The air holes (4) are symmetrically arranged on both sides of the upper part of the stainless steel air pipe (3), and the central angle formed by the line connecting the center lines of the two air holes (4) is 60°.

3. The piston stop casting and quenching device according to claim 1, characterized in that: The stainless steel gas pipe (3) is provided with an outlet sealing plate (5) at its end.

4. The piston stop casting and quenching device according to claim 1, characterized in that: A stainless steel water level regulating pipe 6 is installed at the bottom of the casting and quenching water tank (1).

5. The piston stop casting and quenching device according to claim 1, characterized in that: Several stainless steel support ribs 7 are evenly installed on the top of the cast and quenched bracket (2).

6. The piston stop casting and quenching device according to claim 1, characterized in that: The bottom of the casting and quenching water tank (1) is equipped with a casting and quenching water tank bracket (8).

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