CN103447464A

CN103447464A - Process for preventing deformation of wheel disk of semi-gear rim

Info

Publication number: CN103447464A
Application number: CN2012101749460A
Authority: CN
Inventors: 王�琦
Original assignee: LUOYANG LUOBEI HEAVY INDUSTRY MACHINERY Co Ltd
Current assignee: LUOYANG LUOBEI HEAVY INDUSTRY MACHINERY Co Ltd
Priority date: 2012-05-31
Filing date: 2012-05-31
Publication date: 2013-12-18

Abstract

A process for preventing deformation of a wheel disk of a semi-gear rim meets a supplementing shrinkage requirement of a casting, also ensures a qualified size of the casting, and improves the quality of the casting. The technical schemes for solving the problems are that: 1, a processed part of a wheel rim excircle is inclinedly placed, so that the casting can be artificially allowed to form a sequence solidification state, a casting part away from a riser is firstly solidified, then a part close to the riser is solidified, finally the riser is solidified, and a temperature gradient of the solidification process is controlled; and 2, the wheel disk is not manufactured horizontally no longer, while an anti-deformation process is employed, and an anti-deformation amount is adjusted according to a specific size of the semi-gear rim.

Description

A kind of half-ring gear disc deformation technique that prevents

Technical field

The invention belongs to casting technology field, especially for a kind of half-ring gear disc deformation technique that prevents used in industrial equipment.

Background technology

Half-ring gear is used in a lot of main equipments, in industries such as rotary kiln, comminutor, cooler, grinding machine; Due to the needs of transmission, these industries all be unable to do without half-ring gear, and the quality of half-ring gear quality directly has influence on the life-span of equipment, the performance of equipment and the stationarity of transmission.In recent years, casting industry was growing, also more and more higher to quality requirement, and the designing requirement foundry goods must not have the defects such as crackle, shrinkage porosite, and Internal Quality of Cast is controlled and pressed 2 grades of working position ultrasonic inspections of GB/T7233-87 standard.

Thereby half-ring gear is large scale wall unevenness Complex Parts cooling rate inequality, causes temperature difference, form thermal stress, cause casting deformation; After cast, the molding sand resistance more also can produce distortion.Thus, the distortion of half-ring gear is the result of the two comprehensive deformation.Now the casting method because of the strict present employing of casting quality is: whole circle insulated feeder is placed according to thermal center and flange height ratio in the wheel rim position, to meet the requirement of the inner flaw detection of foundry goods quality, but there is following problem in the foundry goods that existing casting technique is produced: (1) wheel rim emits the quantitative change of actinal surface Excircle machining little.(2) disc tilts, and causes that interior round flange and boss also and then sink.Research by analysis, qualified in order to guarantee the foundry goods flaw detection, placed the full circle rising head, although the internal soundness problem that the full circle rising head solves, reached the flaw detection requirement, but because the rising head volume is large, heat is concentrated, and is difficult for heat radiation, cause cooling velocity slow, larger than general circular rising head amount of contraction, thereby drive wheel rim rising head face integral inclination, shrink inward, disc and interior round flange, boss also and then sink.Such phenomenon has a strong impact on the size quality requirement of half-ring gear.

Summary of the invention

In order to overcome the defect existed in the half-ring gear casting process in traditional handicraft, the invention provides a kind of half-ring gear disc deformation technique that prevents, met the feeding a casting requirement, guarantee that too the size of foundry goods is qualified, improve casting quality.

The technical scheme that the present invention solves its technical problem employing is as follows:

1, as shown in Figure 4, wheel rim Excircle machining amount slant setting, one can make foundry goods form the state of consecutive solidification artificially, foundry goods is first solidified away from the position of rising head, then be to solidify near the position of rising head, finally be only rising head itself and solidify, and control the thermograde of process of setting;

2, no longer level manufacture of disc, but use reversible deformation technique, the concrete size according to half-ring gear, for example: half-ring gear diameter, wheel rim height and thickness, disc size and thickness, adjust anti-deformation, basic theories is that the larger anti-deformation of diameter is larger, the thinner more greatly anti-deformation of disc size is larger, the higher anti-deformation of wheel rim is larger, on the contrary the anti-deformation minimizing, be according to the use of concrete half-ring gear size adjusting anti-deformation.

The invention has the beneficial effects as follows and prevent the distortion of half-ring gear disc, met the feeding a casting requirement, guarantee that too the size of foundry goods is qualified, improve casting quality.

The accompanying drawing explanation

Below in conjunction with accompanying drawing, the present invention will be further described:

Fig. 1 is the schematic diagram of half-ring gear;

Fig. 2 is the profile of half-ring gear;

Fig. 3 is existing half-ring gear casting technique schematic diagram;

Fig. 4 is half-ring gear casting technique schematic diagram after improving;

1. horizontal center lines in figure, 2. disc center line, 3. wheel rim outer ring processing capacity slant setting.

The specific embodiment

During casting as shown in Figure 4; wheel rim Excircle machining amount slant setting; one can make foundry goods form the state of consecutive solidification artificially; foundry goods is first solidified away from the position of rising head; then be to solidify near the position of rising head; finally being only rising head itself and solidifying, and control the thermograde of process of setting. concrete grammar is: the ratio of controlling feeder modulus and foundry goods thermal center modulus; Adopt different pouring types; The thermograde increased progressively to rising head with heat preservation control of material foundry goods. two prevent from causing that because the rising head contraction is excessive thereby the wheel rim cylindrical shrinks excessive Excircle machining quantity not sufficient, thereby cause half-ring gear to scrap.

Wheel rim Excircle machining amount slant setting; one can make foundry goods form the state of consecutive solidification artificially; foundry goods is first solidified away from the position of rising head; then be to solidify near the position of rising head; finally being only rising head itself and solidifying, and control the thermograde of process of setting. concrete grammar is: the ratio of controlling feeder modulus and foundry goods thermal center modulus; Adopt different pouring types; The thermograde increased progressively to rising head with heat preservation control of material foundry goods. two prevent from causing that because the rising head contraction is excessive thereby the wheel rim cylindrical shrinks excessive Excircle machining quantity not sufficient, thereby cause half-ring gear to scrap.

Claims

1. one kind prevents half-ring gear disc deformation technique, it is characterized in that wheel rim Excircle machining amount slant setting, no longer level manufacture of disc, but use reversible deformation technique, the size concrete according to half-ring gear adjusted anti-deformation.

2. a kind of half-ring gear disc deformation technique that prevents according to claim 1, it is characterized in that wheel rim Excircle machining amount slant setting, at first can make artificially foundry goods form the state of consecutive solidification, foundry goods is first solidified away from the position of rising head, then be to solidify near the position of rising head, finally be only rising head itself and solidify, and control the thermograde of process of setting.

3. a kind of half-ring gear disc deformation technique that prevents according to claim 1, is characterized in that no longer level manufacture of disc, but use reversible deformation technique, and the size concrete according to half-ring gear adjusted anti-deformation; The larger anti-deformation of diameter is larger, and the thinner more greatly anti-deformation of disc size is larger, and the higher anti-deformation of wheel rim is larger, on the contrary the anti-deformation minimizing, be according to the use of concrete half-ring gear size adjusting anti-deformation.