CN101354075B - Double-row chain pulley - Google Patents

Abstract

The invention discloses a double-row sprocket wheel which is used as a component for transmission movement and comprises a sprocket wheel body, wheel teeth and a shaft hole. The finished product of the sprocket wheel is obtained by steps that: the product is basically formed by No. 45 steel by the lost-wax casting; the left end part of the shaft hole is cut and processed into the hole that is matched with a bearing; then tooth surface is quenched to obtain the finished product. The technology adopted by the lost-wax casting and the parameters are as follows: a. a formwork needs to be cured at800 DEG C to 850 DEG C and is cooled to the temperature of 600 DEG C to 650 DEG C naturally so as to carry out casting; b. iron melt is heated to the temperature of 1650 DEG C to 1680 DEG C and expanded perlite powder is added for covering the iron melt; after 2 to 3 minutes, scum in a furnace is removed by a mechanical way; then appropriate amount of SiC is added for deoxidation, after that the casting is carried out; c. only one sprue runner is provided. The double-row sprocket wheel uses the lost-wax casting to replace the manufacturing method of using roughcast round steel for cutting andprocessing, thus greatly reducing the cutting capacity and reducing the product cost; meanwhile, the technological parameters of the sprocket wheel are reasonable and the qualification rate is high, therefore, the quality of the manufactured product can fully accord with the actual use requirements.

Description

A kind of duplex chain wheel

Technical field

The present invention relates to be used in the transmission device Element Technology field that has tooth of translatory movement, specifically relate to a kind of sprocket wheel.

Background technique

Duplex chain wheel is widely used in the transmission device than simple chainwheel is much bigger because of its driving force, and the duplex chain wheel that uses is all made through cutting with the blank round steel at present; Have a plurality of gear teeth owing to need to be processed into whole section round steel, and there is the duplex chain wheel of axis hole at the center, bite is very big, 1/3rd of the not enough blank weight of finished weight, and need be furnished with special gear hobbing equipment, processed complex, cost height.

Summary of the invention

The objective of the invention is provides a kind of duplex chain wheel at above-mentioned the deficiencies in the prior art, to reduce bite, reduces manufacture cost.

For achieving the above object, technological scheme of the present invention is such: a kind of duplex chain wheel, comprise sprocket body, and with the body all-in-one-piece gear teeth, and the axis hole at body center; It is to be shaped substantially through lost-wax casting by No. 45 steel, and the left end portion of axis hole so that this axis hole matches with bearing, is finished product through cutting again after the flank of tooth quenches; Because the gear teeth of duplex chain wheel are more, high to the compactness requirement of foundry goods, difficulty is bigger during casting; Technology and parameter that the present invention adopts when casting are as follows:

A. formwork needs 800-850 ℃ of slaking, begins casting through naturally cooling to 600-650 ℃;

B. molten iron is warmed to 1650-1680 ℃, adds swelling perlite powder and covers molten iron, after 2-3 minute, mechanically removes scum silica frost in the stove excessively, adds an amount of SiC deoxidation then; After treating that SiC dissolves fully, molten iron moves in the casting ladle, casts; Molten iron uses up the added-time again in casting ladle, needs to add in stove a small amount of SiC deoxidation again;

C. in casting, running channel is only established one; A plurality of running channels can influence casting quality.

Owing to adopted technique scheme, a kind of duplex chain wheel of the present invention, replace with the manufacture method of blank round steel with lost-wax casting through cutting, foundry goods is except that the hole that cooperates with bearing is carried out the cutting, do not need cutting separately, the cutting amount significantly reduces, and can save steel consumption, do not need special gear hobbing equipment, reduce product cost; And process parameter of the present invention is reasonable, the up-to-standard rate height, and the quality of product that makes fully can realistic usage requirement.

Description of drawings

The present invention is further illustrated below by drawings and Examples.

Fig. 1 is the casting technology schematic representation after the present invention omits formwork.

Fig. 2 is the left view of Fig. 1 medium casting.

Among the figure: 1, the gear teeth, 2, body, 3, axis hole, 4, running channel.

Embodiment

By illustrated in figures 1 and 2, a kind of duplex chain wheel of the present invention comprises sprocket body 2, with the body all-in-one-piece gear teeth 1, and the axis hole 3 at body center; It is to be shaped substantially through lost-wax casting by No. 45 steel, and the left end portion of axis hole so that this axis hole matches with bearing, is finished product through cutting again after the flank of tooth quenches; Because the gear teeth of duplex chain wheel are more, be example with the duplex chain wheel of φ 60, just nearly 28 on its gear teeth require highly to the compactness of foundry goods, and difficulty is bigger during casting; Technology and parameter that the present invention adopts when casting are as follows:

A. formwork needs 800-850 ℃ of slaking, begins casting through naturally cooling to 600-650 ℃;

B. molten iron is warmed to 1650-1680 ℃, adds swelling perlite powder and covers molten iron, after 2-3 minute, mechanically removes scum silica frost in the stove excessively, adds an amount of SiC deoxidation then; After treating that SiC dissolves fully, molten iron moves in the casting ladle, casts; Molten iron uses up the added-time again in casting ladle, needs to add in stove a small amount of SiC deoxidation again;

C. in casting, 4 of running channels are established one; A plurality of running channels can influence casting quality.

Claims (1)

1. duplex chain wheel, comprise sprocket body (2), with the body all-in-one-piece gear teeth (1), and the axis hole at body center (3), it is characterized in that: it is to be shaped substantially through lost-wax casting by No. 45 steel, the left end portion of axis hole so that this axis hole matches with bearing, is finished product through cutting again after the flank of tooth quenches; Technology and parameter that said lost-wax casting is adopted are as follows:

A. formwork needs 800-850 ℃ of slaking, begins casting through naturally cooling to 600-650 ℃;

B. molten iron is warmed to 1650-1680 ℃, adds swelling perlite powder and covers molten iron, after 2-3 minute, mechanically removes scum silica frost in the stove excessively, adds an amount of SiC deoxidation then; After treating that SiC dissolves fully, molten iron moves in the casting ladle, casts; Molten iron uses up the added-time again in casting ladle, needs to add in stove a small amount of SiC deoxidation again;

C. in casting, running channel (4) is only established one.

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