CN202212540U

CN202212540U - Special core support for sand box for large engine cylinder body

Info

Publication number: CN202212540U
Application number: CN2011203032275U
Authority: CN
Inventors: 吴世云; 高文平; 赵学清; 庞争群; 黄果果
Original assignee: Dongfeng Automobile Co Ltd
Current assignee: Dongfeng Automobile Co Ltd
Priority date: 2011-08-19
Filing date: 2011-08-19
Publication date: 2012-05-09
Anticipated expiration: 2021-08-19

Abstract

The utility model relates to a large-scale engine cylinder is with special chaplet of sand box has solved the chaplet structure in the current big molding sand box unreasonable, warp the effect not good to the sand control core, the high problem of foundry goods waste product. The technical scheme includes that the device comprises a saddle-shaped bottom plate, and dumbbell-shaped supporting columns are correspondingly arranged on two side plates of the bottom plate. The utility model discloses simple structure, simple to operate, integration nature are good, can prevent effectively that the psammitolite from the deformation after the molten iron pouring, reduce the foundry goods rejection rate that leads to from this by a wide margin.

Description

The big-block engine cylinder body is with the special-purpose stud of sandbox

Technical field

The utility model relates to a kind of engine and uses sandbox, and concrete is to say that a kind of big-block engine cylinder body is with the special-purpose stud of sandbox.

Background technology

The big-block engine cylinder body is designed with 1-2 root strip core in order to reduce the mechanical performance of sandbox own wt, raising sandbox usually with the sandbox side.For less sandbox, do not support core print in the core usually; And the sandbox of using for the big-block engine cylinder body (being the large-scale sandbox that volume is not less than 1200*950mm*400mm); If there is not the core print of support in the core; In the molten iron casting cycle, core must be heated and produce distortion, causes the casting wasted product (percent defective nearly 100%) of disconnected core or core floatation).For solving the problems of the technologies described above, consider on core, to be provided with the stud of " worker " font, play fixedly core and assurance wall thickness; This but " worker " font stud only can make core locate in one direction, and all the other directions are then all by the core print location, and the big-block engine cylinder body uses the core of sandbox to be slim-lined construction; Because sandbox is bulky, support the stud rigidity and the intensity wretched insufficiency of core after the molten iron pouring, and during cast liquid metals to also producing buoyancy to core; Under the multiple conditioning; The core temperature distortion is serious, and its deformation direction is not a single direction, but multidimensional, unfixed; Cause the stud of " worker " font in the actual use not good to anti-core deformation effect, the casting wasted product problem is not still solved (percent defective is still up to 15%) at all.

The utility model content

The purpose of the utility model is in order to solve the problems of the technologies described above; Provide a kind of simple in structure, easy for installation, amalgamation is good, can effectively prevent the distortion of core after molten iron pouring, the big-block engine cylinder body that significantly reduces the casting wasted product rate cause thus is with sandbox special use stud.

Technical scheme comprises shape of a saddle base plate, and the biside plate correspondence of said base plate is provided with the dumb-bell shape pillar.

The height of said dumb-bell shape pillar is H=(0.6-0.9) * homonymy sandbox wall thickness, and the minimum diameter in pillar stage casing is D=(0.2-0.5) * thermal center diameter, and the maximum gauge at pillar two ends is 1.5-2 a times of minimum diameter.

The every side of said base plate is provided with at least two dumb-bell shape pillars, is L=(0.2-0.5) * core height with the spacing between lateral brace.

Utility model people's big-block engine cylinder body studies in great detail with the stressed variation of being heated of core in the structure of sandbox and the casting cycle, and the stud to core has carried out great architecture advances thus.Adopt shape of a saddle base plate as basic framework; Through research and experiment proof; The base plate of this shape can significantly improve the rigidity and the intensity of stud; The height and width of the height and width of said shape of a saddle base plate and existing strip core coupling is so that core can just in time be inserted in the inside groove that shape of a saddle base plate forms to well.The biside plate correspondence of said base plate is provided with the dumb-bell shape pillar; The rigidity and the intensity of further increase stud is not only in its effect; Liquid metals was to the generation buoyancy of core when the gravity antagonism of increase core was poured into a mould; And can also effectively prevent the distortion of core in the casting cycle to being used for the location requirement of the core of large-scale sandbox in a plurality of directions; The quantity that the every side of base plate is provided with pillar can be preferably every side and be provided with two according to the size reasonable design of core and sandbox.In addition, this dumb-bell shape pillar compare with common cylindrical columns and the amalgamation of molten iron better, can further improve the casting quality of product, avoid problem such as seepage that the rate of reducing the number of rejects and seconds takes place.Here dumb-bell shape pillar height and diameter and sandbox preferably are certain corresponding relation; The height that is the dumb-bell shape pillar is H=(0.6-0.9) * homonymy sandbox wall thickness (i.e. wall thickness of the pairing side sandbox wall of this dumb-bell shape pillar; The pairing both sides of the dumb-bell shape pillar sandbox wall thickness of shape of a saddle base plate both sides is different in most of sandbox); The minimum diameter in dumb-bell shape pillar stage casing is D=(0.2-0.5) * thermal center diameter, and the maximum gauge of pillar two ends (being the two ends of dumbbell shape) is 1.5-2 a times of minimum diameter.And the spacing that the homonymy dumb-bell shape props up intercolumniation is L=(0.2-0.5) * core height.

Beneficial effect:

(1) changed the stud structure of original " worker " font; Base plate adopt strength and stiffness high can nested core " shape of a saddle "; Dumb-bell shape pillar through correspondence the problem on deformation on a plurality of orientation that core exists in the time of can preventing to be used for large-scale sandbox is set, guarantee the core accurate positioning, can also resist the buoyancy that the casting cycle core produces simultaneously; Good with the amalgamation of molten iron, problems such as seepage can not appear.

(2) the utility model stud is simple in structure, and simple installation, time saving and energy saving is specially adapted to the big-block engine cylinder body and uses sandbox; Guarantee the multi-direction location of core; Prevent the core temperature distortion, the disconnected core percent defective of the sandbox of after improving, producing reduces to 0.4%, has improved product quality; Reduce production cost, had wide market application prospect.

Figure of description

Fig. 1 is the utility model stud front view.

Fig. 2 is the utility model stud vertical view.

Fig. 3 is installed on the scheme of installation on the core for the utility model stud.

Wherein, 1-shape of a saddle base plate, 1.1-side plate, the upper right pillar of 2-, 3-bottom right pillar, 4-left side lower supporting rod, the upper left pillar of 5-.The 6-core.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is further explained:

With reference to Fig. 1 and Fig. 2; The utility model comprises four dumb-bell shape pillars on two side plates 1.1 that are installed in shape of a saddle base plate 1 (upper right pillar 2, bottom right pillar 3, left lower supporting rod 4 and upper left pillar 5); Every side has 2 pillars; Corresponding installation, the high H=(0.6-0.9) of said pillar * homonymy sandbox wall thickness; The minimum diameter in said pillar stage casing is D=(0.2-0.5) * thermal center diameter, and the maximum gauge of pillar two ends (being the two ends of dumbbell shape) is 1.5-2 a times of minimum diameter.With the spacing between lateral brace is L=(0.2-0.5) * core height H 1.Referring to Fig. 1; In the present embodiment; Because the sandbox wall thickness that biside plate 1.1 upper supporting columns are corresponding is different; The height of two lateral braces of formulae design is also inconsistent in view of the above, only is example here, and the designer can select rational numerical according to the thickness of sandbox and the conditions such as buoyancy of concrete metal liquid in above-mentioned scope on this basis.

Referring to Fig. 3, during installation,, the core 6 of strip just in time is enclosed within the inside groove 1.2 that shape of a saddle base plate 1 forms with the opening of shape of a saddle base plate 1 down, the installation site of shape of a saddle base plate 1 requires the middle at core 6 total lengths.The installation site of said core 6 in sandbox is constant.

In the period of 2009-2011; This stud of east wind limited company casting subsidiary factory is used for the core of the sandbox (cavity volume is of a size of 1200*950mm*400mm) that the big-block engine cylinder body uses; 1000+GF+ mo(u)lding line sandbox foundry goods is produced in casting altogether, only 4 of disconnected core percent defectives, and disconnected core percent defective is 0.4%; The stud amalgamation is good, and problems such as product ne-leakage take place.

Claims

1. a big-block engine cylinder body is characterized in that with the special-purpose stud of sandbox comprise shape of a saddle base plate, correspondence is provided with the dumb-bell shape pillar on the biside plate of said base plate.

2. big-block engine cylinder body as claimed in claim 1 is with the special-purpose stud of sandbox; It is characterized in that; The height of said dumb-bell shape pillar is H=(0.6-0.9) * homonymy sandbox wall thickness; The minimum diameter in pillar stage casing is D=(0.2-0.5) * thermal center diameter, and the maximum gauge at pillar two ends is 1.5-2 a times of minimum diameter.

3. according to claim 1 or claim 2 big-block engine cylinder body is characterized in that with the special-purpose stud of sandbox the every side of said base plate is provided with at least two dumb-bell shape pillars, is L=(0.2-0.5) * core height with the spacing between lateral brace.