CN202278151U

CN202278151U - Sand core and core shell structure of valve body casting

Info

Publication number: CN202278151U
Application number: CN201120399040XU
Authority: CN
Inventors: 徐兴卫; 王仕能
Original assignee: JIANGSU LIYUAN JINHE CASTING CO Ltd
Current assignee: JIANGSU LIYUAN JINHE CASTING CO Ltd
Priority date: 2011-10-19
Filing date: 2011-10-19
Publication date: 2012-06-20
Anticipated expiration: 2021-10-19

Abstract

The utility model relates to a sand core and core shell structure of a valve body casting. The sand core and core shell structure comprises a core shell and a sand core arranged in the core shell, wherein a sand core head is arranged between the upper part of the sand core and the core shell. The sand core and core shell structure is innovatively characterized in that the sand core and the sand core head are of a split structure; and the sand core head is of a T shape constituted by arranging a positioning end part on the upper end of a rod body, a step hole is formed on the upper end of the core shell, the lower end of the rod body of the sand core head supports against the sand core, and the positioning end part of the sand core head is bonded and fixed with the side wall of the step hole by using a binder. The lower end of the sand core head supports against the sand core, and the upper end of the sand core head is fixed with the core shell by using the binder, so that the sand core head is prevented from moving due to molten iron buoyancy, and the dimensional precision of a casting hole is ensured.

Description

A kind of valve body moulding core and core shell structure

Technical field

The utility model relates to a kind of valve body moulding core and core shell structure, particularly a kind of valve body moulding core and core shell structure that guarantees foundry goods hole dimension precision.

Background technology

When carrying out the casting of valve body moulding, the valve flowing channel core is arranged in the core shell, is provided with the core core print that is used to prop up core between itself and the core shell, is used for preventing that core receives the molten iron buoyancy to produce deformation at casting process.Traditional core and core print are processed integral body, and the core shell is passed in the upper end of core print, prop up the core print upper end through the green-sand on the core shell.Owing to have the gap between core print upper surface and the green-sand, and green-sand has deformability, and when cast, because of the molten iron buoyancy, the core core print trace that can make progress moves, and causes the deformation of core, and then influences the dimensional accuracy in foundry goods hole.

Summary of the invention

The technical problem that the utility model will solve provides a kind of valve body moulding core and core shell structure that guarantees foundry goods hole dimension precision.

For solving the problems of the technologies described above; The technical scheme of the utility model is: a kind of valve body moulding core and core shell structure, comprise the core shell, and be built in the core in the core shell; Be provided with the core core print between said core top and the core shell, its innovative point is: said core and core core print are for dividing body structure; Said core core print is set the end, position by body of rod upper end and is constituted the T font, and said core shell upper end has stepped hole, and the body of rod lower end of said core core print props up core, and the sidewall of the end, location of core core print and core shell stepped hole is fixing through the binding agent bonding.

The advantage of the utility model is: core core print lower end props up core, and the upper end is fixed through binding agent and core shell, avoids guaranteeing the dimensional accuracy of foundry goods because of molten iron buoyancy causes moving of core core print.

Description of drawings

Fig. 1 is valve body moulding core and a core shell structure sketch map in the utility model.

The specific embodiment

As shown in Figure 1, comprise core shell 1, core 2, core core print 3.

Above-mentioned core 2 is built in the core shell 1; Be provided with several core core prints 3 between the top of core 2 and the core shell 1; This core core print 3 is set the T font that the end, position constitutes by body of rod upper end; Core shell 1 upper end has stepped hole, and the distance of the step surface of this stepped hole and below core is slightly less than the shank portion length 0.3-0.7mm of core core print 3, make that the body of rod lower end of core core print 3 props up core 2 after; The end, location and the stepped hole step surface of core core print 3 still leave certain clearance, guarantee that core core print 3 props up core 2.The sidewall of end, location and core shell stepped hole is fixing through the binding agent bonding.It can avoid guaranteeing the dimensional accuracy in foundry goods hole because of the molten iron buoyancy causes moving of core core print 3 when cast.

Claims

1. valve body moulding core and core shell structure comprise the core shell, are built in the core in the core shell, are provided with the core core print between said core top and the core shell, it is characterized in that: said core and core core print are for dividing a body structure; Said core core print is set the end, position by body of rod upper end and is constituted the T font, and said core shell upper end has stepped hole, and the body of rod lower end of said core core print props up core, and the sidewall of the end, location of core core print and core shell stepped hole is fixing through the binding agent bonding.