CN101886212A - Sand casting grinding ball and heat treatment process thereof - Google Patents

Abstract

The invention discloses a sand casting grinding ball and a heat treatment process thereof, wherein, the sand casting grinding ball comprises the following components in percentage by weight: 3.00-3.40% of C, 0.3-1.00% of Si, 0.6-0.9% of Mn, 10.2-11.0% of Cr, not more than 0.10% of S, not more than 0.10% of P, and Fe. In the heat treatment process, oil quenching is carried out on the components, wherein, the quenching temperature is 960 plus or minus 10 DEG C, the time is 2-3min, the drawing temperature is 300 DEG C and the temperature is kept for 5-6h; and then the product is taken out from a furnace to carry out air cooling. In the invention, the single bin abrasion of the grinding ball is only about 20g, and the hardness thereof reaches up to more than HRC63, so the grinding ball is not easy to be out of round and shape; and the heat treatment process has the advantages of high yield per machine hour and reduced single bin abrasion by 40%, thereby greatly reducing use cost and obtaining remarkable social benefits.

Description

Sand casting grinding ball and thermal treatment process thereof

Technical field

The invention belongs to a kind of casting ball and thermal treatment process thereof, specifically is a kind of sand mold casting ball and thermal treatment process thereof.

Background technology

Φ is that the following sand mold casting of 40mm ball C content is generally 2.50-3.00 on the existing market, and Ge Shi hardness is the HRC50-60 degree, is prone to after such product comes into operation to lose the circle distortion, and not wear-resisting, abrasion are high, and the user cost height influences user's unit-hour output.

Summary of the invention

Shortcoming at existing abrading-ball, the invention provides a kind of new sand casting grinding ball and thermal treatment process thereof,, concentrate on studies through experiment repeatedly, adopt simple possible, economic and practical homlolgation to improve the carbide content of abrading-ball, is aided with the oil quenching thermal treatment process, the martensite carbon content of product matrix is significantly increased, hardness reaches more than the HRC63, and its wear resistance significantly improves, and abrading-ball loses the circle rate to be reduced.

Technical scheme of the present invention is as follows:

A kind of sand casting grinding ball is characterized in that the quality percentage composition of its each component is:

C:3.00-3.40, Si:0.3-1.00, Mn:0.6-0.9, Cr:10.2-11.0, S :≤0.10, P :≤0.10, all the other are Fe.

Described sand casting grinding ball is characterized in that the quality percentage composition of its each component is:

C:3.10-3.30, Si:0.3-0.90, Mn:0.6-0.8, Cr:10.2-10.8, S :≤0.08, P :≤0.08, all the other are Fe.

Described sand casting grinding ball is characterized in that ball radius Φ is below the 40mm.

The thermal treatment process of described sand casting grinding ball is characterized in that: (1), oil quenching, quenching temperature are 960 ± 10 ℃, the time: Φ 40mm abrading-ball 3 minutes, the following abrading-ball of Φ 30mm 2 minutes; (2), tempering temperature, 300 ℃, be incubated the air cooling of coming out of the stove in 5-6 hour.

The abrasion of abrading-ball list of the present invention storehouse only are that hardness reaches more than the HRC63 about 20 grams, and are difficult for losing circle, and the unit-hour output height is used in distortion, and the abrasion of single storehouse can descend 40%, reduce use cost, obvious social benefit greatly.

Embodiment

Φ is the following sand casting grinding ball of 40mm, and the quality percentage composition of its each chemical ingredients is:

C:3.10-3.30, Si:0.3-0.90, Mn:0.6-0.8, Cr:10.2-10.8, S :≤0.08, P :≤0.08, all the other are Fe.

Its thermal treatment process:

(1), oil quenching, quenching temperature is 960 ± 10 ℃, the time: Φ 40mm abrading-ball 3 minutes, the following abrading-ball of Φ 30mm 2 minutes; (2), tempering temperature, 300 ℃, be incubated the air cooling of coming out of the stove in 5-6 hour.

Through the contrast experiment, the Φ that selects for use on the market is the following sand casting grinding ball of 40mm, and is not wear-resisting, and the abrasion of single storehouse all more than 30 grams, are easily lost the circle distortion, and user's unit-hour output does not increase, the use cost height; This routine abrading-ball hardness reaches more than the HRC63, and the abrasion of single storehouse only are about 20 grams, and is difficult for losing circle, and the unit-hour output height is used in distortion, and the abrasion of single storehouse can descend 40%.

Claims (4)

1. sand casting grinding ball is characterized in that the quality percentage composition of its each component is:

C:3.00-3.40, Si:0.3-1.00, Mn:0.6-0.9, Cr:10.2-11.0, S :≤0.10, P :≤0.10, all the other are Fe.

2. sand casting grinding ball according to claim 1 is characterized in that the quality percentage composition of its each component is:

C:3.10-3.30, Si:0.3-0.90, Mn:0.6-0.8, Cr:10.2-10.8, S :≤0.08, P :≤0.08, all the other are Fe.

3. sand casting grinding ball according to claim 1 and 2 is characterized in that ball radius Φ is below the 40mm.

4. the thermal treatment process of sand casting grinding ball according to claim 1 and 2, it is characterized in that: (1), oil quenching, quenching temperature are 960 ± 10 ℃, the time: Φ 40mm abrading-ball 3 minutes, the following abrading-ball of Φ 30mm 2 minutes; (2), tempering temperature, 300 ℃, be incubated the air cooling of coming out of the stove in 5-6 hour.