CN101020226A

CN101020226A - Flange casting process

Info

Publication number: CN101020226A
Application number: CN 200710020636
Authority: CN
Inventors: 孙述全; 吴文荣; 张年玉; 马忠
Original assignee: JINMAO CASTING CO Ltd FANCHANG COUNTY
Current assignee: JINMAO CASTING CO Ltd FANCHANG COUNTY
Priority date: 2007-03-15
Filing date: 2007-03-15
Publication date: 2007-08-22

Abstract

The flange casting process includes the following steps: 1. making outer mold, main core box of flange casting and core box of flange screw hole; 2. preparing sand core comprising main flange sand core and flange screw hole sand mold, and sand mold with mold cavity comprising main flange mold cavity and flange screw hole mold cavity; and 3. closing mold box, pouring and post-treatment to form the casting. The present invention makes it possible to omit the work of machining screw holes in flange, and has reduced metal consumption, raised production efficiency and lowered production cost.

Description

The casting forming process of flange foundry goods

Technical field

The present invention relates to the casting forming process of flange foundry goods.

Background technology

The flange foundry goods has a flange that is used to connect the bolt hole structure of miscellaneous part at least, for example flanged fitting, valve, present flange cast casting forming technology is: 1) modeling and core box, model forms the exterior contour of flange foundry goods, and core box is to be used for the core box that the flange core cavity is shaped; 2) core, sand mold preparation prepare flange foundry goods core and flange casting sand mold, and the die cavity of the sand mold for preparing is made up of foundry goods agent structure die cavity and flange die cavity, and the flange profile of flange die cavity and flange foundry goods adapts; 3) mould assembling, cast, post processing form the flange foundry goods.Do not have bolt hole on the flange casting finished products flange of making like this, need the processing bolt hole, not only influence production capacity, the precision of bolt hole can't guarantee simultaneously.

Summary of the invention

Technical problem to be solved by this invention is: provide a kind of and can directly cast out the flange bolt hole, the casting forming process of the flange foundry goods that the bolt hole precision is guaranteed.

Solve this technical problem, technical scheme of the present invention is: a kind of flange cast casting forming technology, 1) manufacturing profile mould and flange foundry goods agent structure core box and flange bolt hole core box; 2) core, sand mold preparation: prepare flange foundry goods agent structure core and flange bolt hole core earlier, described bolt hole core is made up of the projection post that annulus support and outstanding a plurality of diameters and flange bolt hole adapt, then with the projection post of the core in flange bolt hole towards the middle part of flange foundry goods agent structure core, the core with the flange bolt hole is placed on the flange foundry goods agent structure core again; The die cavity of the described sand mold for preparing is made up of flange foundry goods agent structure die cavity and flange die cavity, and the core in flange die cavity and flange bolt hole adapts; 3) core after will making up is put in the sand mold, and mould assembling, cast, post processing form the flange foundry goods with flange bolt hole.

Described flange bolt hole core is made by the core shooter hot box, and the bolt hole core box is contained on the casting core shooter, injects precoated sand, and mould is incubated 40-120 second at 150-300 ℃, solidifies molding sand, opens core box, takes out core.

Described mould holding temperature is preferably 230 ℃, and temperature retention time is 60-90 second.

The material of described flange foundry goods agent structure core box is an aluminium alloy, and the material of flange bolt hole core box is a metal.

The material of described flange foundry goods agent structure core box is a fiberglass, and the material of flange bolt hole core box is a metal.

The molding sand of described flange foundry goods agent structure core is a clay-bonded sand, and the molding sand of flange bolt hole core is furan resin-sand or phenol resin sand.

Flange cast casting forming technology of the present invention is adopted in such a way, the processing flange bolt hole workload that has overcome prior art is big, avoided because of the defective mass defect that causes of bolt hole processing, reduce metal consumption, improved production efficiency, reduced production cost; But the flange bolt hole precision form of the finished product that casts out, bolt hole aperture and pitch-row size are accurate, need not machining,

Description of drawings

Fig. 1 is full flanged tee casting pipe structural representation;

Fig. 2 is the bolt hole core box structural representation of casting full flanged tee casting pipe shown in Figure 1;

Fig. 3 is the flange pipe core schematic diagram of casting full flanged tee casting pipe shown in Figure 1;

Fig. 4 is the bolt hole core schematic diagram that bolt hole core box shown in Figure 2 prepares;

Fig. 5 is flange pipe core shown in Figure 3 and bolt hole core combination schematic diagram shown in Figure 4;

Fig. 6 is full flanged tee casting pipe sand mold core mould assembling schematic diagram;

In Fig. 1 to Fig. 6,1, T type pipeline; 2, flange; 3, flange bolt hole; 4, flange bolt hole core box; 5, bolt hole cavity; 6, toroidal cavity; 7, support; 8, projection post; 9, flange bolt hole core; 10, flange pipe core; 11, sand mold; 12, flange die cavity; 13, pipeline die cavity.

The specific embodiment

As shown in Figure 1, full flanged tee casting pipe is made up of T type pipeline 1 and three flanges 2, and the structure of three flanges 2 is identical, has six flange bolt holes 3 that uniform being used to connects miscellaneous part on each flange 2 respectively.

Casting forming process to full flanged tee casting pipe is described as follows in conjunction with Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 below: 1) make profile mould and flange pipe core box and flange bolt hole core box 4, flange bolt hole core box 4 adopts casting core shooter hot box, also can adopt the core box of manual back-up sand, bolt hole core box 4 has and flange bolt hole 3 corresponding bolts hole cavitys 5 and the toroidal cavity 6 that is communicated with bolt hole cavity 5, the material of flange pipe core box is aluminium alloy or fiberglass, and the material of flange bolt hole core box 4 is a metal; 2) the profile mould prepares sand mold, and the flange pipe core box prepares flange pipe core 10, and core box 4 preparation flange bolt hole cores 9 in flange bolt hole are with flange

bolt hole core

9 and 10 combinations of flange pipe core.Prepare flange pipe core 10 and three flange bolt hole cores 9 earlier, the molding sand of flange pipe core 10 is a clay-bonded sand, the molding sand of flange bolt hole core 9 is furan resin-sand or phenol resin sand, each flange bolt hole core 9 is made up of the projection post 8 that circular support 7 and outstanding a plurality of diameters and flange bolt hole 3 adapt, described flange bolt hole core 10 is made by the core shooter hot box, flange bolt hole core box is contained on the casting core shooter, inject molding sand, mould is incubated 40-120 second at 150-300 ℃, preferably mould is incubated 60-90 second at 230 ℃, solidify molding sand, open core box, take out core.Then with the projection post of each flange bolt hole core 9 towards the middle part of flange pipe core 10, again each flange bolt hole core 9 is placed on the flange pipe core 10; The die cavity of the described sand mold for preparing 11 is made up of pipeline die cavity 13 and flange die cavity 12, and flange die cavity 12 adapts with flange bolt hole core 9.3) core after will making up is put in the sand mold 11, and mould assembling, cast, post processing form the foundry goods with flange bolt hole.But the flange bolt hole precision form of the flanged fitting finished product that casts out like this, bolt hole aperture and pitch-row size are accurate, need not machining, overcome the processing flange bolt hole of prior art workload, avoided because of the defective mass defect that causes of bolt hole processing, metal consumption has reduced 5%-15%, improve production efficiency, reduced production cost.

The above is the casting forming process of the full flanged tee casting pipe of the preferred embodiment of the present invention, equally also be applicable to the flange foundry goods of the flange that has a bolt hole structure that is used to connect miscellaneous part at least, the valve body moulding of valve for example, its casting forming process is basic identical with the casting forming process of full flanged tee casting pipe, valve body agent structure core box need only be replaced flange pipe core box, the core of valve body agent structure replaces the flange pipe core, and the core of valve body agent structure forms the inner chamber of the valve body moulding of valve.But cast out the flange bolt hole precision form of finished product of the valve body moulding of valve like this, bolt hole aperture and pitch-row size are accurate, need not machining, overcome the processing flange bolt hole of prior art workload, avoided because of the defective mass defect that causes of bolt hole processing, alleviated weight, improve production efficiency, reduced production cost.

Claims

1, a kind of flange cast casting forming technology is characterized in that: 1) make profile mould and flange foundry goods agent structure core box and flange bolt hole core box; 2) core, sand mold preparation: prepare flange foundry goods agent structure core and flange bolt hole core earlier, described bolt hole core is made up of the projection post that annulus support and outstanding a plurality of diameters and flange bolt hole adapt, then with the projection post of the core in flange bolt hole towards the middle part of flange foundry goods agent structure core, the core with the flange bolt hole is placed on the flange foundry goods agent structure core again; The die cavity of the described sand mold for preparing is made up of flange foundry goods agent structure die cavity and flange die cavity, and the core in flange die cavity and flange bolt hole adapts; 3) core after will making up is put in the sand mold, and mould assembling, cast, post processing form the flange foundry goods with flange bolt hole.

2, flange cast casting forming technology according to claim 1, it is characterized in that: described flange bolt hole core is made by the core shooter hot box, the bolt hole core box is contained on the casting core shooter, inject precoated sand, mould is incubated 40-120 second at 150-300 ℃, solidify molding sand, open core box, take out core.

3, flange cast casting forming technology according to claim 2, it is characterized in that: described mould holding temperature is 230 ℃, temperature retention time is 60-90 second.

4, according to claim 1 or 2 or 3 described flange cast casting forming technologies, it is characterized in that: the material of described flange foundry goods agent structure core box is an aluminium alloy, and the material of flange bolt hole core box is a metal.

5, according to claim 1 or 2 or 3 described flange cast casting forming technologies, it is characterized in that: the material of described flange foundry goods agent structure core box is a fiberglass, and the material of flange bolt hole core box is a metal.

6, flange cast casting forming technology according to claim 1 is characterized in that: the molding sand of described flange foundry goods agent structure core is a clay-bonded sand, and the molding sand of flange bolt hole core is furan resin-sand or phenol resin sand.