阅读说明：本技术 大型低速船用柴油机十字头滑块白合金浇铸方法和工装 (White alloy casting method and tool for crosshead slide block of large low-speed marine diesel engine ) 是由 崔新全 刘忠 李东超 尹绍福 于 2019-10-21 设计创作，主要内容包括：大型低速船用柴油机十字头滑块白合金浇铸方法和工装,是将长板与短板连成一体的L形胎板和十字头滑块放在浇铸平台上面,长板的内表面同十字头滑块的前面相隔空腔相对,短板尾部的内表面同十字头滑块的一端面加紧接触连接,挡板和挡块放置在胎板的长板尾部结合卡口安装定位,紧固杆的螺杆部分与挡块的螺孔配合、紧固杆前端压在挡板。胎板的长板内表面、短板内表面、十字头滑块的前面和浇铸平台上面形成组合式型腔；浇铸白合金熔液成型,冷却成与十字头滑块前面凝固成一体后。减压槽快速释放内部液体压力减缓渗漏速度,同时液态白合金迅速在减压槽内凝固,进而阻止渗漏到胎板外部。有效避免脱壳,气孔、夹渣等缺陷,提高白合金结合质量。(A method for casting white alloy on crosshead slide block of large-scale low-speed marine diesel engine includes such steps as connecting long plate with short plate to form L-shaped die plate and crosshead slide block on casting platform, arranging the long plate with its internal surface opposite to the front surface of crosshead slide block in a cavity, connecting the short plate with its internal surface to end surface of crosshead slide block in close contact, locating the baffle plate and the stop block on the long plate tail of die plate, combining them together to form a combined cavity, casting white alloy melt, cooling to , quickly releasing internal liquid pressure in decompression slot to slow down leakage speed, and quickly solidifying liquid white alloy in the slot to prevent leakage.)

A method for casting white alloy on crosshead slide block of large-size low-speed ship diesel engine includes such steps as putting crosshead slide block (6) on casting platform (7), vertically putting the front surface of crosshead slide block on casting platform (7), putting L-shaped die plate (1) with long and short plates connected to form body on casting platform (7), putting baffle (3) and baffle (4) on tail of long plate of die plate (1) for installing it in bayonet, external force acting to match screw bolt of fastening rod (5) with screw hole of baffle (4), pressing front end of fastening rod against baffle (3), pressing baffle (6) against front surface of slide block (6) to clamp short plate and slide block (6) on front surface of crosshead slide block (6), removing front surface of crosshead slide block (1, removing front surface of crosshead slide block (6) from die cavity, cooling die plate (6), and cooling down die plate (6) to form white alloy casting die cavity, and casting.

2. The method for casting the white alloy for the crosshead shoe of the large-sized low-speed marine diesel engine according to claim 1, wherein the method comprises the following steps: the outer surface of the long plate of the bed mould (1) is connected with a supporting plate (2), and when the bed mould (1) is placed on the casting platform (7), the lower surface of the supporting plate is also placed on the casting platform (7).

3. The large-scale low-speed marine diesel engine crosshead guide block white alloy casting tool of claim 1, characterized in that: the bottom of the bed mould (1) is provided with a 2mm multiplied by 2mm decompression groove (8) and is also placed on the casting platform (7) along with the bed mould (1), and when the inner surface of the long plate of the bed mould is combined with the baffle plate (3), a ceramic fiber rope (9) with the size of 8mm multiplied by 8mm is embedded in the combination position.

4. The large-scale diesel crosshead guide block white alloy casting tool for the low-speed ship according to claim 1, characterized in that when the baffle plate (3) is arranged at the tail part of the long plate of the bed plate (1), a screw rod arranged through a screw hole at the side of the bayonet of the baffle plate is locked at the tail part of the long plate of the bed plate (1).

5. The large-scale low-speed marine diesel engine crosshead guide block white alloy casting tool of claim 1, characterized in that: the stop block (4) is placed at the tail part of the long board of the tire plate (1) to be combined with the bayonet for installation and positioning, and the stop block (4) is arranged on the tail part of the long board of the tire plate (1) in a Harvard mode.

Technical Field

The invention relates to a white alloy casting connection forming method for compounding white alloy bodies at the front end of a crosshead slide block of a large-scale low-speed marine diesel engine, which belongs to the types of diesel engines.

Background

The crosshead slide block is an important part of the marine diesel engine, the service condition of the crosshead slide block is complex, the main function of the crosshead slide block is to ensure that a piston rod and a crosshead vertically and repeatedly move in a frame of the marine diesel engine, the slide block body is made of cast steel, and in order to reduce friction more smoothly during movement, white alloy is cast on the contact surface of the crosshead slide block and the frame, the white alloy has good comprehensive mechanical properties such as antifriction property, corrosion resistance and the like, and is widely applied to surface laying materials of sliding bearings of large-scale low-speed marine diesel engines.

Disclosure of Invention

The invention aims to provide large-scale low-speed marine diesel engine crosshead slide block white alloy casting methods and tools.

A method for casting white alloy on crosshead slide block of large-scale low-speed ship diesel engine includes such steps as vertically arranging the crosshead slide block on casting platform, putting L-shaped die plate on casting platform, connecting long plate with short plate to form body, putting the long plate on the crosshead slide block, closing the front end of fastening rod to screw hole of stop, pressing the front end of fastening rod to stop, pressing stop to another end of crosshead slide block, clamping short plate and stop to both ends of crosshead slide block, casting white alloy liquid in combined cavity, cooling to obtain fastening body, removing screw part of crosshead slide block, moving stop to front end of crosshead slide block, removing it from die plate, and casting.

In the white alloy casting process, the cast white alloy is firstly solidified and gradually solidified upwards when contacting a casting platform, so that the quality of the cast white alloy is relatively stable, the white alloy liquid leakage cannot occur in the casting process, and the defects of shelling, air holes, slag inclusion and the like are not easy to cause.

In order to prevent deformation of a tire plate and maintain stability during casting, a white alloy casting method of a crosshead guide block of a large-scale low-speed marine diesel engine is characterized in that a support plate is connected to the outer surface of a long plate of the tire plate, and when the tire plate is placed on a casting platform, the lower surface of the support plate is also placed on the casting platform.

The invention has the function of preventing leakage by a solid line, the bottom of the invention is provided with two 2mm multiplied by 2mm pressure reducing grooves, in the casting process, when white alloy liquid fills a cavity, the white alloy liquid leaks from the bottom of the tire plate, the pressure reducing grooves quickly release the internal liquid pressure to slow down the leakage speed, and simultaneously, the liquid white alloy is quickly solidified in the pressure reducing grooves, thereby preventing the white alloy liquid from leaking to the outside of the tire plate. The joint of the inner surface of the bed plate and the baffle is embedded with a ceramic fiber rope of 8mm multiplied by 8mm, so that the contact surface forms soft sealing, and the leakage of the liquid white alloy is effectively prevented. The tail part of the tire plate is designed into a groove for installing a stop block, and a reaction force is formed when the fastening rod applies force to fasten the baffle plate. In order to realize the functions of connecting and sealing the baffle plate with the tire plate and the crosshead slide block, not only a locking device is required to be arranged, but also the ceramic fiber rope can be embedded in the inner surfaces of the baffle plate and the tire plate for effective sealing. The stop block has the function of being connected with the tail part of the tire plate in a Harvard mode, and the fastening force of the fastening rod is transmitted to the baffle plate in a reaction force mode, so that a fastened cavity is formed.

Drawings

FIG. 1 is a schematic structural diagram of a casting tool of a large-scale low-speed marine diesel engine crosshead guide block white alloy casting method;

FIG. 2 is an enlarged view of the tire plate and the support plate of FIG. 1;

FIG. 3 is a left side view of FIG. 2;

FIG. 4 is a bottom view of FIG. 2;

FIG. 5 is an enlarged schematic view of the baffle of FIG. 1;

FIG. 6 is an enlarged view of the stopper shown in FIG. 1;

fig. 7 is an enlarged view illustrating the structure of the fastening rod of fig. 1.

Detailed Description

Embodiments of the present invention are further illustrated in below in conjunction with the following figures.

The method for casting white alloy on a diesel engine crosshead slide block for a large-sized low-speed ship comprises the steps that when a combined type cavity is formed by firstly arranging a tire plate (1), a supporting plate (2), a baffle plate (3), a stop block (4) and a fastening rod (5), the supporting plate (2) and the tire plate (1) are in a body structure, the baffle plate (3) and the stop block (4) are arranged and positioned through the tire plate (1), then the combined type cavity is formed by the action of external force of the fastening rod (5) when the combined type cavity is combined with a combined type white alloy clamping plate (3) in a process of clamping the combined type cavity by a short clamping rod (3) and forming a closed loop, the baffle plate (3) and the closed loop, the baffle plate (6) is arranged on the tire plate (1) and positioned on a long clamping groove (6) and a closed loop, the baffle plate (3) and the baffle plate (7) and the baffle plate (6) is connected with a molten metal loop, the combined with a molten metal loop (6) in a casting cavity, the combined manner, the combined with a molten metal loop, the combined type cavity, the tire plate (2) by a clamping rod (3, the combined with a clamping rod (6) through a clamping groove (3) and a clamping groove (6) and a clamping groove (3) of a clamping rod (3) and a clamping plate, a clamping rod (2) and a clamping groove (2) which is formed in a combined with a combined type white loop, a combined type cavity), the combined type cavity, a clamping plate (2) and a clamping plate (2) which is arranged on the combined with a clamping plate (2) of a clamping plate, a clamping plate (2) and a clamping plate, a clamping.