CN103406499A

CN103406499A - Novel fixed valve sand core device

Info

Publication number: CN103406499A
Application number: CN2013102948409A
Authority: CN
Inventors: 邱绍均; 彭齐龙
Original assignee: SICHUAN HONGYA MACHINE Co Ltd
Current assignee: SICHUAN HONGYA MACHINE Co Ltd
Priority date: 2013-07-15
Filing date: 2013-07-15
Publication date: 2013-11-27
Anticipated expiration: 2033-07-15
Also published as: CN103406499B

Abstract

The invention relates to a novel fixed valve sand core device which comprises an upper die (1), a lower die (2), a sand core (3) and a cavity (4), and the novel fixed valve sand core device also comprises core skeletons (6) and fixed blocks (7), wherein the sand core (3) is of a cross structure, the end parts of the sand core (3) are respectively provided with a sand core head part (8), a core head A (9), a core head B (10) and a core head C (11), the core skeleton (6) is of the cross structure, at least two core skeletons (6) are arranged inside the sand core (3), one end of each core skeleton (6) is wrapped inside the sand core head part (8), the other three ends of each core skeleton (6) respectively extend out of the core head A (9), the core head B (10) and the core head C (11), and the core skeletons (6) which are arranged inside the sand core (3) are welded into a whole through the fixed blocks (7). The novel fixed valve sand core device has the advantages that the structure is simple, the rejection rate of a produced cast steel valve body blank is low, and the technological difficulty can be greatly alleviated.

Description

A kind of novel fixed valve loam core device

Technical field

The present invention relates to the fixture in a kind of valve loam core, particularly a kind of novel fixed valve loam core device.

Background technology

Large-scale valve body blank generally adopts casting, and in valve body blank casting process, the buoyancy produced in casting process according to molten steel makes loam core also insecure under the blocking of sandbox circular arc, and loam core is at molten steel 7.4T/m ³Buoyancy under be easy to become flexible, and the moving 1mm～2mm of core print, the head in the loam core 10mm that just may float, such product just can only be scrapped.Therefore, loam core floating or sinking are the problems that each manufacturer will solve, traditional solution is to lay stud at the loam core head, the height of stud equates with the valve body wall thickness, stud is placed in to the upper and lower in the head loam core of valve body, fix loam core, though the problem that has solved like this loam core floating or sunk, but stud is foreign matter for valve body, must dispose, usually the method adopted is on the valve body after casting, to open a hole, stud is dug up, then adopt the method for welding to fill in hole, after welding, need through x-ray inspection, verify after qualified and can dispatch from the factory.So just have many problems, one is to have increased considerably technology difficulty, and another is to raise because the repair welding poor effect causes percent defective.

Chinese patent 201110238987.7, disclose a kind of big-block engine cylinder body with the special-purpose stud of sandbox, solved the stud unreasonable structure in existing large-scale sandbox, not good to anti-core deformation effect, the problem that casting wasted product is high.Technical scheme comprises shape of a saddle base plate, and on the biside plate of described base plate, correspondence is provided with the dumb-bell shape pillar.The present invention is simple in structure, easy for installation, amalgamation is good, can effectively prevent the distortion of core after the molten iron cast, but the stud structure is foreign matter for engine cylinder-body, need to take out, for general open foundry goods, on the contrary can directly take out, if but in the valve manufacture process, if the stud that adopts this structure is loam core fixedly, when taking out stud, just can run into very large problem, must perforate on valve body, after taking out stud, repair welding again, the easy like this waste product that occurs, and also technique is more complicated.

Summary of the invention

The object of the invention is to overcome the shortcoming of prior art, provide a kind of cast steel valve body blank percent defective simple in structure, that produce low and reduce the novel fixed valve loam core device of technology difficulty.

Purpose of the present invention is achieved through the following technical solutions: a kind of novel fixed valve loam core device, it comprises patrix, counterdie, loam core and die cavity, upper die and lower die inside is respectively arranged with die cavity, patrix coordinates with counterdie, the inner cooperation of die cavity is equipped with loam core, in the space that loam core and die cavity form, be cast with foundry goods, it also comprises arbor and fixed block, described loam core is " ten " character form structure, the end in loam core is respectively the loam core head, core print A, core print B and core print C, arbor is " ten " character form structure, the inside in loam core is provided with at least two arbors, one end of arbor is coated on the inside of loam core head, another three ends of arbor extend to respectively core print A, the outside of core print B and core print C, the arbor that is arranged at inside, loam core is integrally welded by fixed block.

Described arbor is that two high-intensity square steel are welded.

Described core print A, core print B and core print C are individually fixed in die cavity inside.

The present invention has the following advantages:

1, arbor is " ten " character form structure, adopts high-intensity square steel to be welded, simple in structure.

2, arbor is fixed on to inside, loam core, the end of arbor extends to outside loam core, and arbor is fixed on sandbox, realizes that loam core fixes, the cast steel valve body blank percent defective decrease of producing.

3, the foundry goods moulding cooling after, open patrix, adopt gas cutting or cutting machine directly arbor to be sliced off, take out arbor, repair welding valve body after stud is taken out in perforate on valve body, reduced technology difficulty again.

The accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Fig. 2 is the A-A sectional structure schematic diagram of Fig. 1;

Fig. 3 is the cutaway view that loam core and arbor coordinate;

Fig. 4 is the structural representation of counterdie;

Fig. 5 is the structural representation of arbor;

In figure: 1-patrix, 2-counterdie, 3-loam core, 4-die cavity, 5-foundry goods, 6-arbor, 7-fixed block, 8-loam core head, 9-core print A, 10-core print B, 11-core print C.

The specific embodiment

The present invention will be further described below in conjunction with accompanying drawing, but protection scope of the present invention is not limited to the following stated.

As shown in Figure 1, a kind of novel fixed valve loam core device, it comprises patrix 1, counterdie 2, loam core 3 and die cavity 4, patrix 1 and counterdie 2 inside are respectively arranged with die cavity 4, patrix 1 coordinates with counterdie 2, the inner cooperation of die cavity 4 is equipped with loam core 3, in the space that loam core 3 and die cavity 4 form, be cast with foundry goods 5, it also comprises arbor 6 and fixed block 7, described loam core 3 is " ten " character form structure, arbor 6 is that two high-intensity square steel are welded, the end in loam core 3 is respectively loam core head 8, core print A9, core print B10 and core print C11, arbor 6 is " ten " character form structure, the inside in loam core 3 is provided with at least two arbors 6, one end of arbor 6 is coated on the inside of loam core head 8, another three ends of arbor 6 extend to respectively core print A9, the outside of core print B10 and core print C11, the arbor 6 that is arranged at 3 inside, loam core is integrally welded by fixed block 7.

Core print A9, core print B10 and core print C11 are individually fixed in die cavity 4 inside.

On the valve body that a bore is 300mm, pressure-bearing 100kg, do experiment, adopt the higher square steel of intensity to make the material of arbor, through welding fabrication, obtain the arbor 6 of " ten " character form structure, arbor 6 is placed in to inside, loam core, and core print A9, core print B10 and core print C11 are extended respectively in three ends of arbor 6, closed the part after case, arbor 6 is exposed and be welded on patrix 1 and counterdie 2 by fixed block 7.It is basically identical that experimental result detects the upper lower wall thickness of valve body, meets the foundry goods requirement.

Claims

1. novel fixed valve loam core device, it comprises patrix (1), counterdie (2), loam core (3) and die cavity (4), patrix (1) and counterdie (2) inside are respectively arranged with die cavity (4), patrix (1) coordinates with counterdie (2), the inner cooperation of die cavity (4) is equipped with loam core (3), in the space that loam core (3) and die cavity (4) form, be cast with foundry goods (5), it is characterized in that: it also comprises arbor (6) and fixed block (7), described loam core (3) is " ten " character form structure, the end in loam core (3) is respectively loam core head (8), core print A(9), core print B(10) and core print C(11), arbor (6) is " ten " character form structure, the inside in loam core (3) is provided with at least two arbors (6), one end of arbor (6) is coated on the inside of loam core head (8), another three ends of arbor (6) extend to respectively core print A(9), core print B(10) and core print C(11) outside, be arranged at the inner arbor (6) in loam core (3) integrally welded by fixed block (7).

2. a kind of novel fixed valve according to claim 1 loam core device, it is characterized in that: described arbor (6) is that two high-intensity square steel are welded.

3. a kind of novel fixed valve according to claim 1 loam core device is characterized in that: described core print A(9), core print B(10) and core print C(11) be individually fixed in die cavity (4) inside.