CN105057523A - Method for producing roller for forklift steering axle - Google Patents

Abstract

The invention discloses a method for producing a roller for a forklift steering axle. The method comprises the step of preparing and forging a steel ingot comprising, by weight, 2.55-2.65% of C, 0.15-0.25% of Si, 0.16-0.21% of Al, 0.06-0.125% of P, 0.020-0.025% of S, 0.43-0.75% of Cr, 0.032-0.042% of Mg, 1.60-2.20% of Ni, 0.12-0.20% of Ti, and the balance Fe and inevitable impurities. By the adoption of the method, the number of people required for forging is small, operation is more convenient, the labor intensity of workers is low, time and labor are saved during machining, and work efficiency is improved; equipment investment is low, tonnage is reduced greatly, and investment is reduced by about 30%; energy consumption is low, and energy can be saved by 20-30%.

Description

A kind of forklift steering bridge roller production method

Technical field

The present invention relates to the manufacture method of roller, specifically belong to a kind of forklift steering bridge roller production method.

Background technology

Common flat-die forging method can only ensure that the defect forgings such as loose, the pore of steel ingot A line of segragation are closed, and the defect of transition line of segragation and V line of segragation often partly can only obtain forging and closes.In order to enable the large-scale steel ingot day by day increased forge, enough large forging ratio must be ensured and use the press that tonnage is enough large, thus more and more difficult.In addition, in common open die forging process, the surf zone contacted with hammering block is stagnant zone, is difficult to obtain large deflection, and its performance is difficult to be obtained by distortion improve, and the working condition of reality often effects on surface performance have higher requirement.

Roller is one of major part on steering axle of automobile, and vehicle steadily can be made to travel and sensitive transmission travel direction, and the function of roller bears automotive front load, support and drives front-wheel to make motor turning around stub rotation.This product of large batch of production, large by labor intensity of operating staff, product quality is entirely with manual control, labour-intensive technology, and be inappropriately use this technique, production efficiency is very low.

Summary of the invention

The object of this invention is to provide a kind of forklift steering bridge roller production method, improve mechanical property, surface and the heart portion distortion, microstructure and mechanical property uniformity, the roller intensity forged is good, long service life, safe and reliable, be applicable to the production in enormous quantities of various model roller.

Technical scheme of the present invention is as follows:

A kind of forklift steering bridge roller production method, includes following steps:

A) preparation and casting have the steel ingot of following percentage by weight: 2.55%≤C≤2.65%, 0.15≤Si≤0.25%, 0.16%≤Al≤0.21%, 0.06≤P≤0.125%, 0.020≤S≤0.025%, 0.43%≤Cr≤0.75%, 0.032%≤Mg≤0.042%, 1.60≤Ni≤2.20%, 0.12≤Ti≤0.20%, surplus is Fe and inevitable impurity;

B) forge

1) blank heating: by steel ingot blank heating to 980-1050 DEG C;

2) mould and die preheating: the upper die and lower die of forging mold are preheated to respectively 90-110 DEG C, 100-120 DEG C;

3) die-filling forging and stamping: be first positioned in counterdie by the steel ingot blank after heating, patrix pressing speed is 0.2mm/s-0.25mm/s, until upper and lower mould closes, initial forging temperature is 980-1050 DEG C, final forging temperature 900-820 DEG C;

C) loaded in heating furnace by roller forging, charging temperature is 700 ~ 750 DEG C, is incubated 80 ~ 100 minutes; Evenly be warming up to 900 ~ 920 DEG C with the firing rate of 30 ~ 40 DEG C/h again, be incubated 50 ~ 60 minutes; 1040 ~ 1080 DEG C, in heating process are evenly warming up to again, the temperature difference≤10 DEG C of roller forging each several part with the firing rate of 80 ~ 100 DEG C/h;

D) fine finishining is carried out, deburring to the roller finished product generated in step c);

E) Carburization Treatment, carries out carburizing to part in carburizer, and furnace temperature maintains 300 ~ 340 DEG C, and insulation 40 ~ 50min, in meshbeltfurnace, carbon potential is 1.25 ~ 1.52%CP, finally obtains roller finished product.

Described Carburization Treatment, carries out carburizing to part in carburizer, and furnace temperature maintains 320 DEG C, and insulation 45min, in meshbeltfurnace, carbon potential is 1.38%CP, finally obtains roller finished product.

Eutectic phase in the raw material of the present invention's forging is on the formation of forging and the very large impact of forging quality, the plasticity index etc. of easy burning and reduction material when it makes material heat before forging, and the thick β phase in titanium alloy raw material directly affects the conventional mechanical performance of forging.Through the forging that above-mentioned Forging Technology obtains, detect through ultrasonic examination, the internal flaw of material obtains effective elimination, can reach relevant ultrasonic examination requirement completely, compared with conventional wrought processes, qualification rate is from 85-92%, grain size reaches more than 3 grades, final Tensile strength reaches 550MPa, and yield strength reaches 280MPa, and mechanical property meets the demands completely.

Detailed description of the invention

A kind of forklift steering bridge roller production method, includes following steps:

A) preparation and casting have the steel ingot of following percentage by weight: 2.55%≤C≤2.65%, 0.15≤Si≤0.25%, 0.16%≤Al≤0.21%, 0.06≤P≤0.125%, 0.020≤S≤0.025%, 0.43%≤Cr≤0.75%, 0.032%≤Mg≤0.042%, 1.60≤Ni≤2.20%, 0.12≤Ti≤0.20%, surplus is Fe and inevitable impurity;

B) forge

1) blank heating: by steel ingot blank heating to 980-1050 DEG C;

2) mould and die preheating: the upper die and lower die of forging mold are preheated to respectively 90-110 DEG C, 100-120 DEG C;

3) die-filling forging and stamping: be first positioned in counterdie by the steel ingot blank after heating, patrix pressing speed is 0.2mm/s-0.25mm/s, until upper and lower mould closes, initial forging temperature is 980-1050 DEG C, final forging temperature 900-820 DEG C;

C) loaded in heating furnace by roller forging, charging temperature is 700 ~ 750 DEG C, is incubated 80 ~ 100 minutes; Evenly be warming up to 900 ~ 920 DEG C with the firing rate of 30 ~ 40 DEG C/h again, be incubated 50 ~ 60 minutes; 1040 ~ 1080 DEG C, in heating process are evenly warming up to again, the temperature difference≤10 DEG C of roller forging each several part with the firing rate of 80 ~ 100 DEG C/h;

D) fine finishining is carried out, deburring to the roller finished product generated in step c);

E) Carburization Treatment, carries out carburizing to part in carburizer, and furnace temperature maintains 320 DEG C, and insulation 45min, in meshbeltfurnace, carbon potential is 1.38%CP, finally obtains roller finished product.

Claims (2)

1. a forklift steering bridge roller production method, is characterized in that, include following steps:

A) preparation and casting have the steel ingot of following percentage by weight: 2.55%≤C≤2.65%, 0.15≤Si≤0.25%, 0.16%≤Al≤0.21%, 0.06≤P≤0.125%, 0.020≤S≤0.025%, 0.43%≤Cr≤0.75%, 0.032%≤Mg≤0.042%, 1.60≤Ni≤2.20%, 0.12≤Ti≤0.20%, surplus is Fe and inevitable impurity;

B) forge

1) blank heating: by steel ingot blank heating to 980-1050 DEG C;

2) mould and die preheating: the upper die and lower die of forging mold are preheated to respectively 90-110 DEG C, 100-120 DEG C;

3) die-filling forging and stamping: be first positioned in counterdie by the steel ingot blank after heating, patrix pressing speed is 0.2mm/s-0.25mm/s, until upper and lower mould closes, initial forging temperature is 980-1050 DEG C, final forging temperature 900-820 DEG C;

C) loaded in heating furnace by roller forging, charging temperature is 700 ~ 750 DEG C, is incubated 80 ~ 100 minutes; Evenly be warming up to 900 ~ 920 DEG C with the firing rate of 30 ~ 40 DEG C/h again, be incubated 50 ~ 60 minutes; 1040 ~ 1080 DEG C, in heating process are evenly warming up to again, the temperature difference≤10 DEG C of roller forging each several part with the firing rate of 80 ~ 100 DEG C/h;

D) fine finishining is carried out, deburring to the roller finished product generated in step c);

E) Carburization Treatment, carries out carburizing to part in carburizer, and furnace temperature maintains 300 ~ 340 DEG C, and insulation 40 ~ 50min, in meshbeltfurnace, carbon potential is 1.25 ~ 1.52%CP, finally obtains roller finished product.

2. forklift steering bridge roller production method according to claim 1, is characterized in that, described Carburization Treatment, in carburizer, carry out carburizing to part, furnace temperature maintains 320 DEG C, insulation 45min, in meshbeltfurnace, carbon potential is 1.38%CP, finally obtains roller finished product.