CN103480801A

CN103480801A - Novel preparation method for casting crankshaft oil bore

Info

Publication number: CN103480801A
Application number: CN201310427303.7A
Authority: CN
Inventors: 曲迎东; 高民强; 姜珂
Original assignee: Shenyang University of Technology
Current assignee: Shenyang University of Technology
Priority date: 2013-09-18
Filing date: 2013-09-18
Publication date: 2014-01-01

Abstract

The invention relates to a novel preparation method for casting a crankshaft oil bore. The method can be applied to production of crankshaft casting of automobiles, ships and the like. The casting method is adopted, that is, a pore-forming body is placed in a position where the pore-forming is needed, and after pouring, solidification and forming, the pore-forming body is drawn out manually; through the adoption of the method, the size precision, position precision and sphericity or roundness of the crankshaft oil bore can be ensured; the method has the advantages that the size of a smallest cast bore is improved during casting, within certain limits, the pore size can be controlled, the depth diameter is larger, and the like. Through the adoption of the novel preparation method, a few difficulties caused by machining, such as the problems of difficulty in positioning of a workpiece, cooling and chip removal during processing and the like, can be effectively overcome, the production cost can be reduced, and the processing cycle is shortened.

Description

The new preparation process of casting crankshaft oilhole

Technical field

The present invention relates to the new preparation process of casting crankshaft oilhole, be mainly used in the production processes such as automobile, steamer bent axle.

Background technology

Bent axle is the main rotating mechanism of engine, and it is being undertaken and pumping of piston is being changed into to the circular motion of self, guarantee that it lubricates effectively well is the necessary mode that main shaft and crank-pin are avoided wearing and tearing.On bent axle, oilhole belongs to elongated hole, Small and Deep Hole Machining, in numerous machining, be the focus of paying close attention to all the time, as workpiece is difficult to location, cooling and chip removal etc. in process, batch machining elongated hole workpiece is generally all used special equipment, the processing mode adopted at present is mainly with fluted drill processing and drill gun machine tooling on radial drilling machine, but the processing slim hole also can easily make stiffness of twist drill poor, intensity difference, the torque resistant ability, and the new preparation process that the present invention relates to the casting crankshaft oilhole can directly cast out the crankshaft lubrication oilhole, there is moulding process simple, the dimensional accuracy in hole and positional precision can be in the error allowed bands, save processing cost, shorten the advantages such as process-cycle.

Summary of the invention

The present invention proposes the new preparation process of casting crankshaft oilhole, adopt the formerly high temperature resistant non-wettability fiber of uniform winding one deck on the straight rod of high strength high-melting-point circle, then uniform winding one deck is reinforced material, the high temperature resistant non-wettability fiber of uniform winding one deck again, finally at the skin of non-wettability fiber, evenly brush cast paint, through above step, ready-made whole part is referred to as into to hole body.Complete cast according to casting technique, finally the straight rod of circle can be extracted out from foundry goods smoothly together with non-wettability fiber, through follow-up cleaning, form the crankshaft lubrication oilhole.Adopt casting to introduce into hole body and directly cast out the crankshaft lubrication oilhole, formed oilhole meets technological requirement.

The present invention proposes the new preparation process of casting crankshaft oilhole, its moulding process is simple, overcome that the stiffness of twist drill that machining brings is poor, intensity difference, torque resistant ability, workpiece is difficult to location, the difficulty such as cooling and chip removal in process, and reduce widely processing cost, shorten the process-cycle.And effectively improve the minimum size that casts out hole in casting process, pore size can be controlled, and pore size is relatively even, and aspect ratio is larger, becomes the advantages such as the easy location of hole body.Through experimental results demonstrate, can cast out at present diameter at 5mm ~ 7mm, length is in the elongated hole of 200 ~ 300mm.

the accompanying drawing explanation:

Fig. 1 is the bent axle sketch with oilhole;

Fig. 2 is into the schematic cross-section of hole body;

Description of reference numerals:

1, oilhole, 2, bent axle, 3, the straight rod of high strength high-melting-point circle, 4, high temperature resistant non-wettability fiber, 5, back-up coat, 6, high temperature resistant non-wettability fiber, 7, cast paint.

the specific embodiment:

Below in conjunction with the specific embodiment, the present invention is further described

(1) selection material and moulding: press the bent axle composition, select the material of certain proportioning, general bent axle material is spheroidal graphite cast-iron or steel, adopts the die crank designed to complete modeling process;

(2) become the preparation of hole body: adopt the mode of accompanying drawing 2 to be prepared into hole body, become the diameter of section of hole body and length to determine according to the aspect ratio of concrete crankshaft lubrication oilhole;

(3) become the location of hole body: according to the position of crankshaft lubrication oilhole in actual production process, will become the two ends of hole body to locate in sand mold;

(4) melting and cast: by material fusing, and complete and breed, the processes such as slagging-off, finally inject sand mold by molten metal;

(5) take out excellent pore-forming: after treating that molten metal solidifies, adopt manual type will justify straight rod and together extract out together with high temperature resistant non-wettability fiber, thereby form the oilhole consistent with becoming the hole body size.

Basic principle of the present invention is to utilize cast paint and the non-profit fiber of invading to have high-temperature stability; cast paint and non-wettability fiber not with the iron liquid infiltration; cast paint and non-wettability fiber play good interlayer protective effect to the straight rod of circle; add that the straight rod of circle has higher intensity and fusing point, thereby can will become hole body to extract smoothly the formation elongated hole out.

Claims

1. the new preparation process of casting crankshaft oilhole of the present invention, it is characterized in that: the preparation method that becomes hole body is that employing high strength and fusing point are straight excellent (as tungsten-bast alloy higher than the circle of smelting metal liquid temp, nickel-base alloy etc.) as becoming the hole body matrix, the high temperature resistant non-wettability fiber of uniform winding one deck thereon, then uniform winding one deck is reinforced material, the high temperature resistant non-wettability fiber of uniform winding one deck again, last evenly brush cast paint can will become hole body manually to extract the formation oilhole out after completing pouring metal melt.

2. the described one-tenth hole body of claims 1, it is characterized in that: the sectional dimension that becomes hole body is to rely on the diameter dimension of the straight rod of circle and the variation of carbon fiber and thickness of coating layer sum size, become the length of hole body to rely on the straight excellent length of circle, therefore, within the specific limits, the size in hole and the degree of depth are controlled, and it depends on into the size of hole body.

3. according to the described non-infiltration fiber of claims 1, it is characterized in that: high temperature resistant non-wettability fiber can be carbon fiber, alumina fibre etc., and the thickness that whole fibrage is wound around is about 0.5mm .

4. according to the described cast paint of claims 1, it is characterized in that: the selection of the coating of casting can be similar graphite paint, effective mixing of alcohol-base paint or several cast paints, and its cast paint layer thickness is between 0.5 ~ 1mm.

5. the new preparation process of casting crankshaft oilhole of the present invention is characterized in that: the locate mode that becomes hole body is adopt in sand mold punching or open circular groove, and the size of aperture size or circular groove diameter is consistent with one-tenth hole body diameter dimension.