Water channel core mold of large-sized diesel engine cylinder block

Abstract

The invention discloses a water channel core mold of a large-sized diesel engine cylinder block. The water channel core mold of the large-sized diesel engine cylinder block comprises a lower core ejection plate assembly, a lower core box, an upper core box, clamping elements and a sand scraping plate. The lower core ejection plate assembly comprises a lower core ejection plate and lower core ejection rods. A sand core cavity is formed in the upper portion of the lower core box. Core bar supporting blocks are arranged at the two ends of the sand core cavity. The lower core box is arranged above the lower core ejection plate assembly, and a plurality of cushion blocks are arranged between the lower core box and the lower core ejection plate assembly. The upper core box is arranged above the lower core box, and a sand filling opening is formed in the back face of the upper core box. Each clamping element comprises a framework opened at one side and a pressing handle screwed onto an upper cross beam of the framework, and the pressing handles of the upper cross beams and lower cross beams are used for clamping the upper core box and the lower core box to correct mold deformation. By means of the water channel core mold of the large-sized diesel engine cylinder block, bending deformation and fracture of long and thin sand cores are avoided, integrity and accuracy of the sand cores are guaranteed, the splicing procedure and exhaust hole drilling procedure in sand core production are reduced, and production efficiency of the sand cores is improved.

Description

Technical field [0001] The invention relates to the field of engine casting, in particular to a large-scale diesel engine cylinder block water channel core mold. Background technique [0002] At present, in the development of large diesel engine cylinder blocks, in order to verify the rationality of the structure design and the characteristics of the product, a small number of new product verification prototypes are usually assembled by casting and processing. After the verification prototypes, the product optimization design is carried out, and the prototypes are qualified. Only then entered the product mold development and manufacturing sand core for mass production. Therefore, in the early stage of the development of large diesel engine blocks, from a cost perspective, the sand core production of large diesel engine blocks usually does not invest too much metal molds for the production of sand cores. [0003] Moreover, the waterway sand core of the cylinder block of the large d...

AI Technical Summary

Problems solved by technology

[0005] First of all, the disadvantage of the core-making method of splitting cores in half and then splicing them is that the sand core is easy to deform and break the core-because the upper and lower halves of the sand core need to be spliced, sand filling for splicing must be made on the joint surface of each half of the sand core hole, the core bone used can only use slender round steel, which is not rigid enough

The weak point of the sand core is divided into two halves, and the thickness is less than 25mm. The sand core in half is more likely to deform and break at the weak point

[0006] Secondly, the splicing is difficult-the splicing joint surface needs to be glued, the exhaust groove is opened, and there are misalignment and errors in the splicing sand core

[0007] In addition, it is difficult to open the air vent of the sand core - the sand core itself is narrow and thin, and it is made in two halves to ensure strength. The core bone is pre-embedded in each half of the sand core, which makes the space for opening the air vent smaller. The vent grooves to be opened should not only avoid the shape of the sand core, but also ensure that the vent grooves and the outer wall of the sand core have a certain sand thickness, not thin, and the slotting is difficult.

[0008] Finally, the above core-making methods are difficult to operate, and the yield of sand cores is low, which cannot meet the needs of production.

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