CN107199312B

CN107199312B - Rapid casting and forming method of integrated cylinder cover

Info

Publication number: CN107199312B
Application number: CN201710572212.0A
Authority: CN
Inventors: 张俊; 许振冲; 杨基; 谢永泽; 江诚亮; 吕登红; 马国胜; 傅显珍; 周梁坚; 欧洪荣
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2017-07-13
Filing date: 2017-07-13
Publication date: 2023-05-09
Anticipated expiration: 2037-07-13
Also published as: CN107199312A

Abstract

The invention discloses a rapid casting and forming method of an integrated cylinder cover. The casting process of the rapid casting and forming method adopts vertical pouring, and the sand core adopted by the rapid casting and forming method comprises the following steps: and the joint of the cylinder hole water jacket core and the cylinder cover sand core of the integrated sand core is provided with a sand core hollow groove. The rapid casting and forming method of the integrated cylinder cover can improve the strength of the Kong Shuitao core sand core of the cylinder, is convenient for core assembly, and can ensure that the position of the water hole on the cylinder hole water jacket core is connected with the traditional cylinder cover during casting, thereby ensuring that the water flow field of the integrated cylinder cover is unblocked and improving the cooling effect.

Description

Rapid casting and forming method of integrated cylinder cover

Technical Field

The invention relates to the field of cylinder cover casting, in particular to a rapid casting and forming method of an integrated cylinder cover.

Background

The diesel engine cylinder cover is a core component of the whole diesel engine. The integrated cylinder cover is a product of the technical development of the diesel engine, and is a cylinder cover integrating a traditional diesel engine cylinder cover part and a traditional engine body water jacket part. The method has the advantages of good integrity, high power rise and the like, and is gradually developed. The diesel engine cylinder cover is generally produced by sand casting, the integrated cylinder cover is provided with a cylinder Kong Shuitao sand core due to the fact that the integrated cylinder cover is integrated with a traditional engine body, the cylinder hole water jacket core is often connected with the traditional cylinder cover through a plurality of water feeding hole sand cores, the bottom of the integrated cylinder cover is generally suspended, the difficulty of sand core assembly is increased, and the exhaust problem of the cylinder Kong Shuitao core with few process holes cannot be solved at all. How to develop a new rapid prototyping casting technology is the bottleneck of whether the integrated cylinder cover can be successfully developed and produced normally.

According to the traditional sand casting method and sand core forming method, the development and production of the integrated cylinder cover can be completed. However, this casting and sand core forming method has obvious disadvantages, mainly expressed in that:

1. the cylinder Kong Shuitao core is independently assembled, the supporting part is less when the core is assembled, the bottom is suspended, and the core is difficult to assemble;

2. the cylinder Kong Shuitao core is independently assembled, the cylinder Kong Shuitao core sand core is low in strength and easy to break, the sand core is easy to deform and bend, a burr is generally generated at the joint part of two different sand cores during casting, and the burr cannot be cleaned, so that the position of a water hole on a cylinder hole water jacket core connected with a traditional cylinder cover can only be cast through locally or cannot be cast through at all, the water flow field of an integrated cylinder cover is influenced, the cooling effect is influenced, and the whole machine is scrapped in severe cases;

3. the cylinder Kong Shuitao core is independently assembled, gas generated by the sand core during casting can only be discharged from the core heads of the two process holes on the front side and the rear side of the cylinder cover, and the sand core is not timely and smoothly discharged, so that casting defects such as air holes and the like are caused, and the yield is low;

4. the cylinder hole water jacket core and the traditional cylinder cover part are respectively and independently manufactured, and the core manufacturing efficiency is low.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.

Disclosure of Invention

The invention aims to provide a method for quickly casting and forming an integrated cylinder cover, which has simple and reasonable steps, can improve the strength of a Kong Shuitao core sand core of a cylinder, is convenient for core assembly, and can ensure that the position of a water hole on a water jacket core of a cylinder hole can be cast through with the position connected with a traditional cylinder cover during casting, thereby ensuring that a water flow field of the integrated cylinder cover is unblocked and improving the cooling effect; compared with single core making, the integrated sand core can greatly improve the core making efficiency; the integrated sand core is skillfully provided with a sand core hollowing structure, so that the core making efficiency can be improved, the air of the sand core at the water jacket part of the cylinder hole is conveniently led and discharged, the smooth exhaust is ensured, and the casting pouring yield is improved.

In order to achieve the above object, the present invention provides a method for rapid casting and forming of an integrated cylinder head, wherein the casting process adopts vertical casting, and the rapid casting and forming method adopts a sand core comprising: and the joint of the cylinder hole water jacket core and the cylinder cover sand core of the integrated sand core is provided with a sand core hollow groove.

Preferably, in the above technical solution, the integrated sand core is manufactured by using a rapid forming laser sintering technology.

Preferably, in the above technical solution, the core undercut has a process hole.

Compared with the prior art, the invention has the following beneficial effects: according to the rapid casting and forming method of the integrated cylinder cover, the water jacket core of the cylinder hole of the traditional machine body and part of sand cores of the cylinder cover are designed into the integrated sand cores, so that the strength of the Kong Shuitao core sand cores of the cylinder can be improved, the core assembly is convenient, the position, connected with the traditional cylinder cover, of the water hole on the water jacket core of the cylinder hole can be cast through, the smoothness of a water flow field of the integrated cylinder cover is ensured, and the cooling effect is improved; compared with single core making, the integrated sand core can greatly improve the core making efficiency; the integrated sand core is skillfully provided with a sand core hollowing structure, so that the core making efficiency can be improved, the air of the sand core at the water jacket part of the cylinder hole is conveniently led and discharged, the smooth exhaust is ensured, and the casting pouring yield is improved.

Drawings

Fig. 1 is a schematic casting view of the method of rapid casting and forming of an integrated cylinder head of the present invention.

Fig. 2 is a schematic illustration of a sand core of the method of the present invention for rapid casting and forming of an integrated cylinder head.

Fig. 3 is a schematic view of a seventh sand core of the method of the present invention for rapid casting and forming of an integrated cylinder head.

FIG. 4 is a schematic illustration of a hollow-out structure of a sand core for a method of rapid casting and forming of an integrated cylinder head according to the present invention

Detailed Description

The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or components.

The rapid casting and forming method of the integrated cylinder cover according to the specific embodiment of the invention aims at the problems existing in the existing sand casting method and sand core forming method, and can realize rapid casting of the integrated cylinder cover and produce the high-performance integrated cylinder cover meeting the product requirements. The method specifically comprises the following steps:

first, the casting process design is completed. Wherein, the casting process adopts a vertical casting process scheme, and the arrangement relation of a casting system 1 and a casting blank 2 is shown in figure 1; as shown in fig. 2, the sand core includes: a first sand core 3, a second sand core 4, a third sand core 5, a fourth sand core 6, a fifth sand core 7, a sixth sand core 8, a seventh sand core 9, an eighth sand core 10, a ninth sand core 11 and a tenth sand core 12. The seventh sand core 9 is an integrated sand core of the cylinder hole water jacket core and the cylinder cover sand core, and the traditional machine body cylinder hole water jacket core and part of the sand core of the cylinder cover are skillfully designed into the integrated sand core, so that the strength of the sand core can be improved, the sand core is convenient to assemble, the position, connected with the traditional cylinder cover, of the water hole on the cylinder hole water jacket core can be cast through, the smoothness of a water flow field of the integrated cylinder cover is ensured, and the cooling effect is improved; compared with single core making, the core making efficiency is greatly improved.

As shown in fig. 3 and fig. 4 (fig. 4 is a hollow schematic view of a sand core hollow structure), when designing a casting process of an integrated sand core, a sand core hollow groove 13 is arranged at a position where a cylinder hole water jacket core 15 of the integrated sand core (a seventh sand core 9) is connected with a cylinder cover sand core (a traditional cylinder cover part) and is thick, and the sand core hollow groove 13 is provided with a process hole 14. The main functions of the sand core hollow slot 13 are two, one is to improve the efficiency of laser sintering and forming of the integrated sand core, the other is to lead the air of the cylinder hole water jacket core to the top of the integrated sand core, exhaust the air from the top, increase the exhaust channel of the cylinder hole water jacket core, and quicken the exhaust of the sand core air, thereby reducing the scrappage caused by casting defects such as air holes and the like and improving the yield.

And then, completing the rapid forming process design of each sand core according to a rapid forming process method, and completing the manufacture of all sand cores.

Wherein, the seventh sand core 9 is manufactured by adopting a rapid prototyping laser sintering technology, and the rest sand cores are respectively manufactured according to the sand core proposal of the traditional rapid prototyping technology. After the seventh sand core 9 is sintered by laser, when the residual sand is cleaned, the residual sand in the sand core hollow structure is cleaned up (generally sucked out by a dust collector) through the process holes 14 at the sand core hollow structure, so that the smoothness of the sand core hollow structure is ensured.

Before core assembly, the process holes 14 on the integrated sand core are filled with sand, so that molten iron can not flow into the sand core hollow structure from the process holes during pouring, and exhaust of the sand core of the cylinder hole water jacket core part is prevented.

Rapid prototyping has been widely used in various areas of the world. The selective laser sintering rapid forming technology is one of the rapid forming technologies, and is a forming technology which comprises layering three-dimensional outline shapes of sand cores according to certain thickness through corresponding software, outputting forming program files, uploading the forming program files to corresponding laser sintering rapid forming machines, gradually scanning the laser sintering rapid forming machines according to the output three-dimensional outline shapes, and hardening scattered sand to obtain corresponding sand cores. The forming technology needs to be subjected to laser sintering, sand removal, baking and other processes. The forming technology is widely applied to forming and manufacturing of various sand cores due to the flexibility of scanning, and has obvious advantages especially in forming and manufacturing of complex sand cores.

And finally, core assembly is carried out according to the core assembly sequence, and casting is finished to obtain the high-performance integrated cylinder cover casting blank meeting the product requirements. By the method, the strength of the Kong Shuitao core sand core of the cylinder can be improved, the core can be conveniently assembled, and the position, connected with the traditional cylinder cover, of the water hole on the water jacket core of the cylinder hole can be ensured to be cast through during casting, so that the smoothness of a water flow field of the integrated cylinder cover is ensured, and the cooling effect is improved; compared with single core making, the integrated sand core can greatly improve the core making efficiency; the integrated sand core is skillfully provided with a sand core hollowing structure, so that the core making efficiency can be improved, the air of the sand core at the water jacket part of the cylinder hole is conveniently led and discharged, the smooth exhaust is ensured, and the casting pouring yield is improved.

In summary, the method for quickly casting and forming the integrated cylinder cover designs the traditional engine body cylinder hole water jacket core and part of cylinder cover sand cores into the integrated sand cores, can improve the strength of the cylinder Kong Shuitao core sand cores, is convenient for core assembly, and can ensure that the position of a water hole on the cylinder hole water jacket core connected with the traditional cylinder cover can be cast through during casting, thereby ensuring that a water flow field of the integrated cylinder cover is smooth and improving the cooling effect; compared with single core making, the integrated sand core can greatly improve the core making efficiency; the integrated sand core is skillfully provided with a sand core hollowing structure, so that the core making efficiency can be improved, the air of the sand core at the water jacket part of the cylinder hole is conveniently led and discharged, the smooth exhaust is ensured, and the casting pouring yield is improved.

The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. The rapid casting and forming method for the integrated cylinder cover is characterized in that a casting process of the rapid casting and forming method adopts vertical pouring, and a sand core adopted by the rapid casting and forming method comprises the following steps: an integrated sand core integrating the cylinder hole water jacket core and the cylinder cover sand core together, wherein a sand core hollow groove is formed at the joint of the cylinder hole water jacket core and the cylinder cover sand core of the integrated sand core;

wherein, the integrated sand core is manufactured by adopting a rapid forming laser sintering technology;

wherein, the sand core hollow slot is provided with a process hole.