CN101569983A - Method for forging and molding inner rings of rolling-mill bearings - Google Patents

Abstract

The invention provides a method for forging and molding inner rings of rolling-mill bearings, which adopts a rolling-expanding mode to forge and mold in a heating-forging temperature range. The method comprises the following steps: feeding a material section into a gas generator and heating the material section to between 1,100 and 1,200 DEG C; taking out the material section from the gas generator and feeding the material section into an electric air hammer; upsetting and punching the heated material section on the electric air hammer; putting a clamp rod into a punched hole and putting the material section together with the clamp rod into a V-shaped clamp groove for forging and stretching so as to increase material density; opening width and finishing forging an inner ring rough of a rolling-mill bearing; conveying the inner ring rough of the rolling-mill bearing to a ring-rolling machine for reaming and rolling to reach the molding size of the inner ring rough of the rolling-mill bearing; and performing spray cooling on the inner ring rough which is rolled and reaches the size so as to finish forging and molding the inner ring of the rolling-mill bearing. The method has the advantages of high material utilization ratio, high production efficiency, low cost, noise reduction, environmental pollution reduction, little machining allowance and energy conservation.

Description

The method for forging and molding of inner rings of rolling-mill bearings

Technical field

The present invention relates to the forging method of bearing ring, particularly relate to the method for forging and molding of inner rings of rolling-mill bearings.

Background technology

The processing method of inner rings of rolling-mill bearings blank in the past, its blank weight and size are big, adopt the moulding of high temperature open die forging mostly, change machining again over to, the forging process of its blank is subjected to the pollution of high temperature, noise and flue dust, operating environment is very abominable, production efficiency is low, and it is big and stock utilization is low that blank is reserved processing capacity, and ton forging coal consumption and power consumption are big, power consumption is high, is directed at the production cost height.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of stock utilization height, the production efficiency height, and cost is low, reduces noise and environmental pollution simultaneously, and allowance is few, the method for forging and molding of the inner rings of rolling-mill bearings of energy savings.

The technical scheme that adopts is:

The method for forging and molding of inner rings of rolling-mill bearings is in the heats forged temperature range, adopts the method for grinding expansion mode forging molding, comprises the following steps:

Step 1: will the section of expecting send into and be heated to 1100-1200 ℃ in the gas generator;

Step 2: will the section of expecting come out of the stove and send into electronic pneumatic hammer, heating material section carried out on electronic pneumatic hammer pier is thick, punching, put into punching with the folder rod again and put into the V-type clip slot together with the folder rod and forge pulling, the increase density of material, open width is finished the inner rings of rolling-mill bearings blank and is forged again;

Step 3: the inner rings of rolling-mill bearings blank is reached the ring rolls reaming roll, reach inner rings of rolling-mill bearings blank compact dimensions;

Step 4: will roll and finish the inner ring blank spraying cooling that reaches size, and promptly finish the processing of inner rings of rolling-mill bearings forging molding.

Stock utilization of the present invention can improve 20%, production efficiency can be increased to 70%, forging per ton economize on coal 270kg, economize on electricity 120 degree, according to statistics: 120 of past per tour (8 hours) products, present 400, output has increased by 333.3%, saves steel 3000kg, and the steel saving is worth 18000 yuan, coal is saved 4266kg, the coal saving is worth 5872.4 yuan, and economize on electricity 1896 degree are saved 1116 yuan of the electricity charge.In process, the time that forges is few, has reduced noise and smoke contamination simultaneously, has played environmental-protection function, and in follow-up process, the allowance of turner is little, and processing is fast, has also played the effect in saves energy source.

The specific embodiment

The method for forging and molding of inner rings of rolling-mill bearings, this routine finished product inner ring size: external diameter 312mm, internal diameter 280mm, height 220mm.Blank dimension: external diameter 317 ^{+ 2}Mm, internal diameter 274 ^-2Mm, height 230 ^{+ 2}Mm.Blanking 39.5kg, material core heavy 0.3kg, fire consumption 1.5kg, forge weight 37.7kg, the bearing inner race processing method:

1, will the section of expecting sends into and be heated to 1100 ℃ in the gas generator;

2, will the section of expecting come out of the stove and send into the electronic pneumatic hammer of 750kg, heating material section carried out on the electronic pneumatic hammer of 750kg pier is thick, punching, the long folder rod of thick with Φ 90mm again, 270mm is put into punching and is put into the V-type clip slot together with the folder rod and forge pulling, increase density of material, open width again behind the pulling 243-238mm, open width height 235mm wherein needs 30 seconds time from discharging in the stove to forging to finish, and finishes the inner rings of rolling-mill bearings blank and forges;

3, the inner rings of rolling-mill bearings blank is reached the ring rolls reaming and roll, its ring rolls originates from the Zhucheng, Shandong Province, and model is D51-550B, and the process that rolls needs 15-20 time second, reaches inner rings of rolling-mill bearings blank compact dimensions;

4, will roll and finish the inner ring blank spraying cooling that reaches size, and forge process and finish.

Claims (1)

1, the method for forging and molding of inner rings of rolling-mill bearings is in the heats forged temperature range, adopts the method for grinding expansion mode forging molding, it is characterized in that comprising the following steps:

Step 1: will the section of expecting send into and be heated to 1100-1200 ℃ in the gas generator;

Step 2: will the section of expecting come out of the stove and send into electronic pneumatic hammer, heating material section carried out on electronic pneumatic hammer pier is thick, punching, put into punching with the folder rod again and put into the V-type clip slot together with the folder rod and forge pulling, the increase density of material, open width is finished the inner rings of rolling-mill bearings blank and is forged again;

Step 3: the inner rings of rolling-mill bearings blank is reached the ring rolls reaming roll, reach inner rings of rolling-mill bearings blank compact dimensions;

Step 4: will roll and finish the inner ring blank spraying cooling that reaches size, and promptly finish the processing of inner rings of rolling-mill bearings forging molding.