Device for casting cylinder cover

Abstract

A device for casting a cylinder cover comprises a die. The die comprises a bottom die body, a side die body and a core assembling tool. The core assembling tool comprises core assembling plates and sand cores installed on the core assembling plates. The core assembling plates are in a wedge shape. Cooling channels are formed in the core assembling plates. The bottom die body comprises a bottom die body frame and a bottom die body core. A wedge-shaped groove is formed in the upper portion of the middle of the bottom die body frame. A second venting hole and a second air inlet are formed in the groove wall of the wedge-shaped groove. An installation groove communicated with the wedge-shaped groove is formed in the lower portion of the middle of the bottom die body frame. The bottom die body core is installed in the installation groove. A sealing hatch cover is arranged at the lower end of the bottom die body core. When the core assembling plates and the wedge-shaped groove are assembled, the second air inlet is communicated with the second venting hole through the cooling channels so that an exhaust channel can be formed; an inner cavity of the sealing hatch cover serves as a sealed hatch, one end of a pipe connected with a compressed air source is connected with the sealing hatch cover, and the other end of the pipe is connected to the second air inlet. According to the device for casting the cylinder cover, the temperature gradient difference is formed through a three-stage cooling step, so that stress cracks of a casting are eliminated; the die is distributed in a split mode, online operation is convenient, and casting requirements for cylinder cover scale production can be met.

Description

technical field [0001] The invention relates to a device for casting a cylinder head. Background technique [0002] There are many casting methods in the cylinder head molding technology. The metal gravity casting blank has become the first choice for aluminum alloy cylinder head casting because of its stable size, reliable process, reproducible process, and convenient production organization. In the existing cylinder head casting process, there are the following problems: [0003] First, since the cylinder head is an important load-bearing part of the engine, the castings require excellent mechanical properties after processing; in order to obtain a fine structure, the general method adopts two-stage quenching measures for the bottom mold and the combustion chamber. The quenching intensity is high and the temperature gradient is too narrow. After the casting solidifies and shrinks, hot cracks or cold cracks tend to occur inside; the chilling strength is small, the temperat...

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Problems solved by technology

[0003] First, since the cylinder head is an important load-bearing part of the engine, the castings require excellent mechanical properties after processing; in order to obtain a fine structure, the general method adopts two-stage quenching measures for the bottom mold and the combustion chamber. The quenching intensity is high and the temperature gradient is too narrow. After the casting solidifies and shrinks, hot cracks or cold cracks tend to occur inside; the chilling strength is small, the temperature in the central area of ​​the cylinder head is high, and the sequential solidification is difficult to complete within a unit time, and loose defects are easily formed inside the casting; oil seepage occurs in the cylinder head during use , water seepage, oil foaming and other problems

[0004] Second, the structure of the inner cavity of the cylinder head is complex and requires uniform wall thickness. The common method is to place the lower core in the bottom mold, and then use the movable mold to close the mold, and position the sand core by means of clearance fit. Since the sand core combination is interrelated, the mold clamping is misplaced, Due to sand core deformation, casting floating core and other reasons, it is difficult to ensure the mutual position, wall thickness and size changes of sand cores

[0005] Third, the layout of the bottom mold of the traditional cylinder head casting mold includes mechanisms such as cooling, exhaust, material return, guide connection, and pipeline arrangement.

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