CN105363980A - Method for preparing forged SHSS (Semi-high Speed Steel) rolling mill roll by radial rotary precision forging - Google Patents

Abstract

The invention relates to a preparation method of a rolling mill roll, and in particular relates to a method for preparing a forged SHSS (Semi-high Speed Steel) rolling mill roll by radial rotary precision forging. The method is characterized in that a blank of the forged SHSS rolling mill roll is subjected to high-temperature diffusion, wherein the temperature is 1230 to 20 DEG C and maintained for 30 to 35 hours; then the temperature is decreased to be not greater than 1180 DEG C; an RF70 type precision forging machine is used for performing radial rotary forging and forming through four hammer heads, so as to obtain the forged SHSS rolling mill roll. Thee forged piece is uniformly stressed with the four sides during the precision forging and forming process, so that the structure is uniform and small by being compared with that of free forging, the plasticity and toughness, endurance strength, fatigue resistance and other indexes of the forging piece can be improved, and the brittle transition temperature can be decreased; meanwhile, the rolling mill roll can be greatly prevented from processing deformation caused by non-uniform release of inner stress during the processing process, thereby improving the product processing quality as well as prolonging the service life; the processing allowance of an outer ring can be decreased; 270kg of materials can be averagely saved for each rolling mill roll; more than 3 hours of the processing time can be saved; the efficiency can be improved by more than 30%.

Description

The preparation method of radial rotary finish forge SHSS half high speed forged steel roll

Technical field

The present invention relates to a kind of preparation method of roll, particularly relate to a kind of preparation method of radial rotary finish forge SHSS half high speed forged steel roll.

Background technology

At present, domestic SHSS half high speed forged steel roll adopts flat-die forging method shaping, and forging temperature is high, fire is secondary many, and allowance is large, and production cost is high.Along with the development lifting of forging molding process technical merit and the use of advanced forging molding equipment, for the forging molding of SHSS half high speed forged steel roll creates condition, therefore, factory has carried out the preparation method's research and trial production that rotate radial precision forging SHSS half high speed forged steel roll.

Summary of the invention

The technical problem that the present invention solves is: solve the former open die forging of SHSS half high speed forged steel roll add showing tremendous enthusiasm time many, structural homogenity and surface quality is poor, allowance greatly, forge that efficiency is low, manufacturing cost high problem, reach energy-saving and cost-reducing, the object of cost efficiency.

Technical solution:

The process of radial rotary finish forge SHSS half high speed forged steel roll, it is characterized in that, SHSS half high speed forged steel roll blank is carried out High temperature diffusion, temperature: 1230 DEG C-20 DEG C, insulation: 30-35 hour, cool to 1180 DEG C-20 DEG C, in RF70 type precise forging machine, adopt four hammerhead radial swaging shaping and deformations to obtain.

Described four hammerhead radial swagings adopt reducing shaping.

The process of radial rotary finish forge SHSS half high speed forged steel roll, is characterized in that, four hammerhead radial swaging forming method steps are as follows:

(1). first steel ingot forging is extremely become φ 483.5 ± 5mm blank, add the amount of contraction of 0.75%;

(2). tup is opened RL500mm;

(3). calculate blank marking length, B manipulator is moved to 1326mm;

(4). forging is once marked to φ 430mm to blank one end;

(5). open tup RL446mm;

(6). by step (4) blank step at quarter, forge to φ 360mm;

(7). open tup RL376mm;

. by step (6) blank again carve step forging to φ 292.5mm;

(9). open tup RL500mm, A manipulator is moved to 1174mm;

(10). again A manipulator is moved to 776mm, then B manipulator clamps step (8) blank step end;

(11). B manipulator is moved to 1745mm, and A manipulator moves to 2000mm;

. by step (8) the blank other end carry out marking forging to φ 406mm;

(13). open tup RL426mm;

. to step (12) in blank again mark forging to φ 327.4mm;

Hammer stroke number of times: 180 beats/min, total forging ratio 4.63 ~ 10.6; Heating Steel Ingots temperature 1210 DEG C-1240 DEG C, blank heating temperature 1160 DEG C-1190 DEG C, final forging temperature: 900 DEG C-1000 DEG C.

Described roll final forging temperature is preferred: 920 DEG C-950 DEG C.

Adopt in the inventive method and rotate radial precision forging by controlling hammer stroke number of times: 180 beats/min, improve structural homogenity and surface quality, enhance productivity; Heating Steel Ingots temperature 1230 DEG C-20 DEG C, insulation: 30-35 hour, eliminates SHSS half high speed forged steel liquation, improves the quality of products.

Feature of the present invention:

1. adopt RF70 type precise forging machine, moulding technique that four tups rotate radial rapid forge SHSS half high speed forged steel roll, because of forging finish forge forming process be four sides uniform stressed, thus its tissue is more even compared with open die forging, tiny, be conducive to the index such as plasticity and toughness, creep rupture strength, fatigue behaviour improving forging, reduce brittle transition temperature.Meanwhile, the machining deformation etc. that barrel produces due to the uneven release of internal stress in process can be reduced, and then the crudy of improving product and service life.

2. the forging molding time is propped up by former open die forging 40min/ and reduces to 15min/ and prop up, and forging molding efficiency is more than doubled.

The outer garden allowance of 3.SHSS half high speed forged steel roll reduces to about 15mm by the 30mm of flat-die forging, on average often props up and saves material 270kg, and average when saving machined nearly 3 hours, machining efficiency improve more than 30%.

4. rotating radial precision forging SHSS half high speed forged steel roll is a kind of low cost, high-quality, high efficiency process, applied widely, remarkable in economical benefits.

Accompanying drawing explanation

Fig. 1 is product structure schematic diagram of the present invention;

Fig. 2 is that the present invention's 1 product liquation of sampling organizes metallograph;

Fig. 3 is that the present invention's 2 product liquations of sampling organize metallograph.

Fig. 4 is finish forge roll grain size figure of the present invention;

Fig. 5 is open die forging roller blank grain size of the present invention.

Detailed description of the invention

Blank φ 600 × 2000(SHSS);

By SHSS half high speed forged steel roll Heating Steel Ingots to 1230 DEG C-20 DEG C, carry out diffusion 30 hours, first steel ingot jumping-up is pulled out cogging to φ 600mm, then by blank heating to 1180 DEG C-20 DEG C, final forging temperature: 920 DEG C-950 DEG C, hammer stroke number of times: 180 beats/min, total forging ratio 4.63 ~ 10.6; Forging molding in RF70 type precise forging machine.

Its deformation technique process and main technologic parameters:

(1). first steel ingot forging is extremely become φ 483.5 ± 5mm blank, add the amount of contraction of 0.75%;

(2). tup is opened RL500mm;

(3). calculate blank marking length, B manipulator is moved to 1326mm;

(4). forging is once marked to φ 430mm to blank one end;

(5). open tup RL446mm;

(6). by step (4) blank step at quarter, forge to φ 360mm;

(7). open tup RL376mm;

. by step (6) blank again carve step forging to φ 292.5mm;

(9). open tup RL500mm, A manipulator is moved to 1174mm;

(10). again A manipulator is moved to 776mm, then B manipulator clamps step (8) blank step end;

(11). B manipulator is moved to 1745mm, and A manipulator moves to 2000mm;

. by step (8) the blank other end carry out marking forging to φ 406mm;

(13). open tup RL426mm;

. to step (12) in blank again mark forging to φ 327.4mm, forging is to becoming Fig. 1 form.

Claims (4)

1. the preparation method of radial rotary finish forge SHSS half high speed forged steel roll, it is characterized in that, SHSS half high speed forged steel roll blank is carried out High temperature diffusion, temperature: 1230 DEG C-20 DEG C, insulation: 30-35 hour, cool to 1180 DEG C-20 DEG C, in RF70 type precise forging machine, adopt four hammerhead radial swagings shaping obtained.

2. the preparation method of radial rotary finish forge SHSS half high speed forged steel roll according to claim 1, is characterized in that, described four hammerhead radial swagings adopt reducing shaping.

3. the preparation method of radial rotary finish forge SHSS half high speed forged steel roll according to claim 1 and 2, is characterized in that, four hammerhead radial swaging forming method steps are as follows:

(1). first steel ingot forging is extremely become φ 483.5 ± 5mm blank, add the amount of contraction of 0.75%;

(2). tup is opened RL500mm;

(3). calculate blank marking length, B manipulator is moved to 1326mm;

(4). forging is once marked to φ 430mm to blank one end;

(5). open tup RL446mm;

(6). by step (4) blank step at quarter, forge to φ 360mm;

(7). open tup RL376mm;

. by step (6) blank again carve step forging to φ 292.5mm;

(9). open tup RL500mm, A manipulator is moved to 1174mm;

(10). again A manipulator is moved to 776mm, then B manipulator clamps step (8) blank step end;

(11). B manipulator is moved to 1745mm, and A manipulator moves to 2000mm;

. by step (8) the blank other end carry out marking forging to φ 406mm;

(13). open tup RL426mm;

. to step (12) in blank again mark forging to φ 327.4mm;

Hammer stroke number of times: 180 beats/min, total forging ratio 4.63 ~ 10.6; Heating Steel Ingots temperature 1210 DEG C-1240 DEG C, blank heating temperature 1160 DEG C-1190 DEG C, final forging temperature: 900 DEG C-1000 DEG C.

4. the preparation method of the radial rotary finish forge SHSS half high speed forged steel roll according to claim 1 or 3, it is characterized in that, described roll final forging temperature is preferred: 920 DEG C-950 DEG C.