CN101844306A - Processing method of annular gear of thin-wall member - Google Patents

Abstract

The invention relates to a processing method of an annular gear of a thin-wall member, comprising the following steps of: selecting a seamless steel tube as a raw material, blanking, sawing the seamless steel tube into a blank, carrying out thermal treatment, normalization process and isothermal annealing process, finely turning the blank, turning the thermal-treatment blank into the exterior geometric size of a product by using a lathe, processing internal teeth, and finally carrying out thermal treatment. The invention has the advantages of simple process, steel and electric energy saving, reduction of steel consumption and no forging, improves production environment, shortens manufacturing procedures, reduces manufacturing cost and improves the utilization rate of the materials.

Description

Processing method of annular gear of thin-wall member

Technical field

The present invention relates to a kind of gear ring processing technology, specifically is a kind of processing technology of annular gear of thin-wall member.

Background technology

All at the high-power lorry of exploitation, because automotive wheels side reducer mechanism has compact conformation, it is big to bear moment of torsion for present many auto producers, the bearing capacity height, and advantages such as good reliability are in existing each truck of extensive use.Annular gear of thin-wall member is the vital part in the hub reduction gear mechanism, and its use amount is big, but internal tooth adopts gear shaping usually, pushes away tooth, draws the tooth moulding, and difficulty of processing is big, stock utilization is low.The traditional handicraft production process is long in addition, and material consumption and product energy consumption are all big, cost is high, and environmental pollution is serious during forging.

Summary of the invention

The objective of the invention is to overcome the shortcoming of above-mentioned technology, provide a kind of technology simple, material consumption and product energy consumption are little, and cost is low, free of contamination processing method of annular gear of thin-wall member.

Processing technology of the present invention is as follows:

1, selection

External diameter is that φ 200～φ 300mm, wall thickness are the seamless steel pipe of 40～20mm;

2, blanking

The seamless steel pipe of above-mentioned material is installed on the Z4032 sawing machine clamps the material base of sawed-off one-tenth 80～100mm length;

3, a heat treatment

Normalizing process: 850～890 ℃ of heating-up temperatures, be incubated 0.5 hour, air-cooled then to room temperature;

Isothermal annealing technology: annealing temperature is 850～870 ℃, is cooled to 660 ℃ of insulations 4 hours, cools off with stove then;

4, finish turning

Blank after the heat treatment is machined to the product shape physical dimension with lathe turning;

5, internal tooth processing

With broaching tool pinion cutter with the internal tooth completion of processing;

6, final heat treatment

Adopt tufftride heat treatment: workpiece is heated to 550～590 ℃ in being full of the saturated atmosphere of ammonia, methane, be incubated 3 hours, water-cooled then, and making its case hardness is HB≤350, centre hardness 22～28HRC, interior tissue and mechanical performance reach designing requirement.

The present invention is that technology is simple than the advantage of traditional handicraft, saves steel and electric energy; Reduce steel consumption; Need not to forge, improved production environment; Shorten manufacturing process, reduced manufacturing cost, improved the utilization rate of material.

The specific embodiment

According to the unlike material of seamless steel pipe, can adopt normalizing process or annealing process.

No. 45 high-quality seamless steel pipes, adopt normalizing process, heating-up temperature: 850～890 ℃, be incubated 0.5 hour, air-cooled then to room temperature.

Low-carbon (LC) high-quality seamless steel pipe, adopt isothermal annealing technology, annealing temperature: 850～870 ℃, be cooled to 660 ℃ of insulations 4 hours, cool off with stove then.

Embodiment 1

Name of product: ST121B ring gear

1, selection

No. 45 thick-walled seamless steel pipes φ 266X25mm;

2, blanking

After the seamless steel pipe of φ 266X25mm was installed in and clamps on the Z4032 sawing machine, the saw charge length was 99mm;

3, heat treatment for the first time

Use normalizing process,, heat 850～890 ℃ of temperature, be incubated 0.5 hour No. 45 high-quality seamless steel pipes of above-mentioned blank, air-cooled then to room temperature, normalizing hardness 179～226HB;

4, finish turning

Going up finish turning tooth base at numerically controlled lathe (CK7815) is external diameter φ 260.5mm, endoporus φ 222.5mm, and high 92.5mm, all the other sizes require processing according to product drawing;

5, internal tooth processing

Getting the internal tooth parameter is: the number of teeth 57, and modulus 4,20 ° of pressure angles, reference diameter φ 228 pulls on the moulding of once broaching with broaching tool in that 80T is upright;

5, final heat treatment

Adopt tufftride heat treatment: workpiece is heated to 570 ℃ in being full of the saturated atmosphere of ammonia, methane, be incubated 3 hours, water-cooled then, and making its case hardness is HB≤350, centre hardness 22～28HRC, interior tissue and mechanical performance reach designing requirement.

Embodiment 2

Name of product: benz ring gear

1, selection

20CrMo thick-walled seamless steel pipes φ 266X25mm;

2, blanking

After the seamless steel pipe of φ 266X25 is installed in and clamps on the Z4032 sawing machine, saw blank 85mm;

3, heat treatment for the first time

The 20CrMo thick-walled seamless steel pipes of above-mentioned blank is adopted isothermal annealing technology, and 850～870 ℃ of annealing temperatures are cooled to 660 ℃ of insulations 4 hours, cool off with stove then;

4, finish turning

Finish turning tooth base is external diameter φ 262mm on numerically controlled lathe CK7815, endoporus φ 227.78mm, and high 81.5mm, all the other sizes require processing according to product drawing;

5, internal tooth processing

Getting the internal tooth parameter is: the number of teeth 56, and modulus 4.1,22 ° 30 of pressure angle '

Reference diameter φ 229.6 adopts broaching tool to stand at 80T and pulls on the moulding of once broaching;

6, final heat treatment

Adopt tufftride heat treatment: carburizing and quenching

Case hardness 9～63HRC, effective hardened-depth: 1～1.2mm, interior tissue and mechanical performance reach designing requirement.

Claims (1)

1. processing method of annular gear of thin-wall member, it is characterized in that: described processing technology is as follows:

(1), selection

External diameter is that φ 200～φ 300mm, wall thickness are the seamless steel pipe of 20～40mm;

(2), blanking

The seamless steel pipe of above-mentioned material is installed on the Z4032 sawing machine clamps the material base of sawed-off one-tenth 80～100mm length;

(3), a heat treatment

Normalizing process: 850～890 ℃ of heating-up temperatures, be incubated 0.5 hour, air-cooled then to room temperature;

Isothermal annealing technology: annealing temperature is 850～870 ℃, is cooled to 660 ℃, is incubated 4 hours, cools off with stove then;

(4), finish turning

Blank after the heat treatment is machined to the product shape physical dimension with lathe turning;

(5), internal tooth processing

With broaching tool pinion cutter with the internal tooth completion of processing;

(6), final heat treatment

Adopt tufftride heat treatment: workpiece is heated to 550～590 ℃ in being full of the saturated atmosphere of ammonia, methane, be incubated 3 hours, and water-cooled to case hardness is HB≤350 then, centre hardness 22～28HRC, and interior tissue and mechanical performance reach designing requirement.