Casting mold for large-cylinder-diameter semi-forming combustion chamber piston

Abstract

The utility model discloses a casting mould of a large-cylinder-diameter semi-forming combustion chamber piston, which comprises an upper mould cover and a lower mould piece, and a piston casting cavity is formed inside after the upper mould cover and the lower mould piece are assembled; a forming surface structure matched with the appearance of the combustion chamber is arranged at the bottom of the upper mold cover; the lower die piece comprises a die body and a sleeve cover, the sleeve cover is arranged on the outer side of the die body, a groove channel is formed in the die body, and a cooling water channel is formed between the groove channel of the die body and the sleeve cover. According to the utility model, the forming surface structure which is matched with the appearance of the combustion chamber of the piston blank is arranged at the bottom of the upper die cover, so that the approximate appearance of the combustion chamber on the top surface of the piston can be obtained through casting, and the piston blank can be perfected by only needing a small amount of machining on the top surface of the piston blank; the later machining allowance of the piston blank is reduced; and by arranging the cooling water channel, the casting liquid cooling efficiency is improved, manpower and material resources are saved, and finally the piston production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of piston casting technology, and in particular relates to the casting mold of a large-diameter semi-formed combustion chamber piston. Background Technology

[0002] Pistons are reciprocating parts in the cylinder block of a car engine. The piston crown is a component of the combustion chamber, and therefore is often made into different shapes by casting.

[0003] Currently, piston blanks are often produced using traditional gravity casting with a centrally located top riser, side gating, and bottom core-pulling mold. The resulting piston blank has a raised riser structure in the center of the top surface area, but lacks the combustion chamber area that is typically machined for large-diameter gas engine pistons. Such piston blanks have a large machining allowance for the piston combustion chamber, especially requiring milling and turning, and a long subsequent machining process to obtain the final piston top surface and combustion chamber appearance. In addition, the slow cooling process of the casting liquid during blank casting results in a slow rate of piston solidification and forming. All of these factors combined lead to relatively low production efficiency of piston blanks and subsequent machining. Utility Model Content

[0004] This utility model addresses the problems in the prior art by proposing the following technical solution:

[0005] This utility model provides a casting mold for a large-diameter semi-formed combustion chamber piston, comprising:

[0006] The upper mold cover and the lower mold part, after being closed, form a piston casting chamber inside;

[0007] The bottom of the upper mold cover is provided with a molding surface structure that matches the shape of the combustion chamber;

[0008] The lower mold component includes a mold body and a sleeve cover. The sleeve cover is disposed on the outside of the mold body. The mold body has a channel, and a cooling water channel is formed between the channel of the mold body and the sleeve cover.

[0009] As a preferred embodiment of the above technical solution, the cover is provided with an inlet and a outlet connected to the cooling water channel, and a valve is provided on the outlet.

[0010] As a preferred embodiment of the above technical solution, the water inlet is located at the upper end of the cover, and the drain outlet is located at the lower end of the cover.

[0011] As a preferred embodiment of the above technical solution, the number of water inlets is set to multiple.

[0012] As a preferred embodiment of the above technical solution, a cooling water jacket is provided on the upper mold cover at a position above the forming surface structure, and a cover plate for sealing the cooling water jacket is provided on the top of the cooling water jacket.

[0013] As a preferred embodiment of the above technical solution, the cover plate is provided with a set of connectors communicating with the cooling water jacket.

[0014] As a preferred embodiment of the above technical solution, the cover and the mold body are connected by a number of screws.

[0015] The beneficial effects of this utility model are as follows:

[0016] This invention, through the design of a forming surface structure at the bottom of the upper mold cover that matches the outer shape of the combustion chamber of the piston blank, allows for the casting of the approximate shape of the combustion chamber on the top surface of the piston. This means that only a small amount of machining is required to perfect the piston blank, reducing the machining allowance in the later stages. Furthermore, the design incorporates cooling channels to improve the cooling efficiency of the casting liquid, saving manpower and resources, and ultimately increasing the production efficiency of the piston. Attached Figure Description

[0017] Figure 1 The diagram shown is an overall schematic diagram of the casting mold in the embodiment;

[0018] Figure 2 The diagram shown is a cross-sectional view of the upper mold cover in the embodiment;

[0019] Figure 3 The diagram shown is a cross-sectional view of the lower module in the embodiment;

[0020] Reference numerals: 10. Upper mold cover; 11. Molding surface structure; 12. Cooling water jacket; 13. Cover plate; 131. Joint; 20. Lower mold part; 21. Mold body; 22. Cover; 23. Cooling water channel; 24. Water inlet; 25. Drain outlet; 251. Valve; 26. Screw. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0022] Example

[0023] like Figure 1 , Figure 2 As shown, Figure 1 The diagram shown is an overall schematic diagram of the casting mold in the embodiment; Figure 2 The diagram shown is a cross-sectional view of the upper mold cover in the embodiment;

[0024] This device includes:

[0025] The upper mold cover 10 and the lower mold part 20 form a piston casting chamber inside after the upper mold cover 10 and the lower mold part 20 are closed.

[0026] The bottom of the upper mold cover 10 is provided with a molding surface structure 11 that matches the shape of the combustion chamber;

[0027] Specifically, the dimensions of the formed surface structure 11 match but are not exactly the same as the dimensions of the combustion chamber exterior, leaving a certain machining allowance.

[0028] By setting a molding surface structure 11 at the bottom of the upper mold cover 10 that matches the outer shape of the combustion chamber of the piston blank, the approximate shape of the combustion chamber on the top surface of the piston can be cast. This means that only a small amount of machining is needed to perfect the piston blank, reducing the machining allowance of the piston blank in the later stage, saving manpower and material resources, and improving production efficiency.

[0029] like Figure 1 , Figure 3 As shown, Figure 1 The diagram shown is an overall schematic diagram of the casting mold in the embodiment; Figure 3 The diagram shown is a cross-sectional view of the lower module in the embodiment;

[0030] The lower mold part 20 includes a mold body 21 and a sleeve cover 22. The sleeve cover 22 is located on the outside of the mold body 21. A channel is provided on the mold body 21, and a cooling water channel 23 is formed between the channel of the mold body 21 and the sleeve cover 22.

[0031] The cover 22 is provided with an inlet 24 and a drain 25 that are connected to the cooling water channel 23. A valve 251 is provided on the drain 25. The inlet 24 is located at the upper end of the cover 22, and the drain 25 is located at the lower end of the cover 22.

[0032] When cooling the piston blank, cold water is rapidly injected into the cooling channel 23 from the inlet 24. At this time, the valve 251 on the outlet 25 is closed, and the cooling channel 23 is quickly filled with cold water, so that the casting liquid is cooled evenly and the cooling efficiency is uniform.

[0033] Once the cooling water channel 23 is full, valve 251 can be opened to discharge the heated cooling water in the cooling water channel 23. At this time, the inlet 24 continues to inject water into the cooling water channel 23. The flow rate can be appropriately reduced so that the injection rate is the same as the drainage rate. The cooling water channel 23 is always filled with cold water. By continuously discharging heated water and injecting cold water, the cooling efficiency of the casting liquid is improved.

[0034] The number of inlets 24 is set to multiple.

[0035] Multiple inlets 24 help improve the efficiency of cooling water entry, ensuring that cooling water can be distributed more quickly and evenly throughout the cooling water channel 23.

[0036] The cover 22 is connected to the mold body 21 by a number of screws 26.

[0037] Specifically, such as Figure 1 As shown, the upper and lower ends of the cover 22 and the mold body 21 are connected by several screws 26. This mechanical connection provides a stable assembly structure, ensuring a tight fit between the two, and a sealing ring is provided at the inner connection to ensure its sealing performance.

[0038] like Figure 2 As shown, Figure 2 The diagram shown is a cross-sectional view of the upper mold cover in the embodiment;

[0039] A cooling water jacket 12 is provided on the upper mold cover 10 above the molding surface structure 11, and a cover plate 13 for closing the cooling water jacket 12 is provided on the top of the cooling water jacket 12.

[0040] The cover plate 13 is provided with a set of connectors 131 that communicate with the cooling water jacket 12, namely the water inlet and the water outlet. The cooling water volume and cooling time of the cooling water jacket 12 can be freely controlled by the water inlet and the water outlet through an external device.

[0041] Cooling water enters the cooling water jacket 12 from the inlet on the cover plate 13. The cooling water jacket 12 is used to store coolant. After absorbing the heat in the mold, the cooling water is discharged from the outlet, further improving the cooling efficiency of the mold. The cooling water jacket 12 is located directly above the molding surface structure 11, which can remove the heat from this critical area, shorten the cooling time, and improve production efficiency.

[0042] Working principle: When using this device, the upper mold cover 10 and the lower mold part 20 are first closed to form a complete casting chamber. Then, high-temperature molten metal is injected into the casting chamber through the reserved gate or other feeding channel, so that the approximate shape of the combustion chamber on the piston top surface can be cast.

[0043] When cooling the piston blank: cold water is rapidly injected into the cooling water channel 23 through the inlet 24. At this time, the valve 251 on the drain outlet 25 is closed, and the cooling water channel 23 is quickly filled with cold water, so that the casting liquid is cooled evenly and the cooling efficiency is uniform. After the cooling water channel 23 is full, the valve 251 can be opened to discharge the heated cooling water in the cooling water channel 23. At this time, the inlet 24 continues to inject water into the cooling water channel 23. The flow rate can be appropriately reduced so that the injection speed is the same as the drainage speed. The cooling water channel 23 is always filled with cold water. By continuously discharging heated water and injecting cold water, the cooling water inlet 12 is circulated in the same way.

[0044] After the metal has completely solidified, separate the upper mold cover 10 and the lower mold part 20, and take out the completed piston blank.

[0045] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A casting mold for a large-diameter semi-formed combustion chamber piston, characterized in that, include: The upper mold cover (10) and the lower mold part (20) form a piston casting chamber inside after the upper mold cover (10) and the lower mold part (20) are closed. The bottom of the upper mold cover (10) is provided with a molding surface structure (11) that matches the shape of the combustion chamber; The lower mold (20) includes a mold body (21) and a cover (22). The cover (22) is disposed on the outside of the mold body (21). The mold body (21) has a channel, and a cooling water channel (23) is formed between the channel of the mold body (21) and the cover (22).

2. The casting mold for a large-diameter semi-formed combustion chamber piston according to claim 1, characterized in that, The cover (22) is provided with an inlet (24) and a drain (25) connected to the cooling water channel (23), and a valve (251) is provided on the drain (25).

3. The casting mold for a large-diameter semi-formed combustion chamber piston according to claim 2, characterized in that, The water inlet (24) is located at the upper end of the cover (22), and the drain outlet (25) is located at the lower end of the cover (22).

4. The casting mold for a large-diameter semi-formed combustion chamber piston according to claim 2 or 3, characterized in that, The number of water inlets (24) is set to multiple.

5. The casting mold for a large-diameter semi-formed combustion chamber piston according to claim 1, characterized in that, A cooling water jacket (12) is provided on the upper mold cover (10) above the molding surface structure (11), and a cover plate (13) for closing the cooling water jacket (12) is provided on the top of the cooling water jacket (12).

6. The casting mold for a large-diameter semi-formed combustion chamber piston according to claim 5, characterized in that, The cover plate (13) is provided with a set of connectors (131) that communicate with the cooling water jacket (12).

7. The casting mold for a large-diameter semi-formed combustion chamber piston according to claim 1, characterized in that, The cover (22) is connected to the mold body (21) by a number of screws (26).

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