SU1632987A1 - Method and apparatus for making rolls for rolling mills - Google Patents

Abstract

The invention relates to the deformation and heat treatment of steel and can be used in the ferrous metallurgy in the manufacture of rolls of rolling mills. OBJECT OF THE INVENTION The invention relates to the deformation and heat treatment of steel and can be used in the iron and steel industry in the manufacture of rolling mill rolls. The purpose of the invention is to improve the quality by increasing the accuracy of the geometric dimensions of the rolls. FIG. 1 shows the device, a general view; in fig. 2 is a view A in FIG. quality improvement by increasing the accuracy of the geometric dimensions of the rolls. The method includes the simultaneous deformation of the workpiece with a vibro-impact roller and a calibrating roller with a total degree of deformation of 20-40%, with the share of vibro-impact processing being 15-30%, and the calibrating processing 5-10%. The deforming unit has a calibrating roller which is displaced in the feed direction along the axis of the workpiece relative to the roller of the vibro-impact mechanism by 0.3-0.5 lengths of the cylindrical section, has the same profile with the supporting rollers and constitutes a closed caliber with them. The roller of the vibro-impact mechanism has a 1.3-1.5 times smaller diameter or 1.3-1.5 times less width than the other rollers, or has a profile radius of 50-80 mm. In the plane perpendicular to the axis of the workpiece, the calibrating roller is located at an angle of 20-30 ° & to the vertical axis. 2 s, p. 3 hp f-ly, 4 ill. / in fig. 3 - the profile of the roller vibro-Nika; in fig. 4 - gauge roller profile. In the workpiece preheated to austenitization temperature, the deformation is carried out simultaneously by vibro-impact deformation and run-in with a sizing roller with a total degree of deformation of -40 20-40%, and vibro-impact deformation is performed by O5 SO со co oo

Description

31

with degrees of deformation Ј 15-30%, running in with a sizing roller with degrees of deformation 5

The difference of the proposed method from the known one is that, along with the vibro-impact treatment, the deformation is carried out by an additional calibrating roller with a profile, the same profile of the supporting rollers and a closed caliber with them, and the roller of the vibro-impact mechanism has

meter, 1.3–1.5 times smaller than the diameter of the remaining rollers, or 1.3–1.5 times smaller than the width, or has a profile radius of 50–80 mm, with the calibrating roller shifted in the direction the feed along the axis of the workpiece is 0.3-0.5 the width of the calibrating area relative to the roller of the vibro-impact mechanism 20 and the supporting rollers, and in the plane perpendicular to the axis of the workpiece it is at an angle of 20-30 to the vertical axis.

All rollers in the plane, perpendicular to the axis of the workpiece, are rotated by an angle

 arctg

So TF)

(one)

Where

blanks,

For

bQ - axial feed mm / about ";

D is the machining diameter, mm, of the friction sliding force on the contact surfaces. At angles of rotation, smaller and larger yp, the contact slip force increases sharply, which leads to intensive tool wear.

The width of the cylindrical section of the calibrating roller is 1.3-1.5 rapa larger than the roller of the vibro-impact mechanism, but should not be less than 20 and greater than 50 mm, since at lower values the accuracy of the outer surface of the workpiece is not ensured due to incomplete study of the tracks of vibro-impact deformation , and at large - dramatically increases the force on the roller. When the calibrating roller is displaced in the feed direction relative to the vibratory shock roller less than 0.3 of the width of the calibrating section, the workpiece material is not captured by its intake cone, and when the axial displacement is more than 0.5 width, the processing traces do not overlap and the temperature difference in the deformation pause increases.

five

g 5 0

five

0

five

0

P

45

55

 The angular distance around the circumference between the roller of the vibro-impact mechanism and the calibrating roller is 20-30 g. At smaller angular distances x, the absorbing roller is not placed on the deformation node, and at large angles, the temperature difference in the interdeformational pause sharply increases and the quenching temperature at the entrance of the workpiece does not provide spr.

The device includes a drive for axially feeding a workpiece consisting of engine 1, gearbox 2, belt drive 3 with interchangeable pulleys, lead screw 4, carriage 5, drive for rotating the workpiece located on carriage 5 and consisting of engine 6P gearbox 7, belt drive 8 interchangeable pulleys, spindle 9, gearbox 10, a deforming unit consisting of a static roller preload mechanism 11, a vibro-impact mechanism 12, supporting and calibrating rollers 13 and 14, a calibrating roller mechanism 15 at an angle of 30 to the vertical axis (FIG. 2) with the roller 16, the roller 17 of the vibro-impactor being in the same plane with the supporting rollers 13 and 14, and the sprayer 18.

The device works as follows.

According to the adjusting sample, the radial outreach of the vibro-impact mechanism, supporting rollers, radial and axial outreach of the calibrating roller are set so as to ensure the degree of deformation Ј 15-30% in outer diameter during vibro-impact deformation and Ј 5-10% when rolling in with a calibrating roller.

The carriage 5 is set in its original position, the workpiece 19 is installed on the spindle 9. Thereafter, from the engine 6 through, the belt drive 8 and the worm gear 7, the workpiece is rotated to include an inductor 10 in which the workpiece is heated to the deformation temperature. Then from the engine 1 through the belt drive 3, the worm gear 2, the lead screw 4 and the uterine nut of the carriage 5, the axial flow is reported to the billet.

The vibro-impactor roller with the help of springs of the static mechanism 11, is pressed against the workpiece and is attached to the vibration from the pneumatic vibrator

12 o Calibration rsl.lk 1b, tuned to the size pe to the adjustment sample with

p about g-I about; ttsu mea h z i Ј.

rolls on

The second surface of the workpiece after vibro-impact. After exiting the de-node, the billet enters the sprayer 17, where it is pumped with intensive shower cooling. During the installation of the next billet, the cycle

is lost.

Example, Ls to the proposed method is treated with a batch of cylindrical billets of steel 9X in quantities of 50 pieces. In this case, the workpiece, which -. rotates around its axis, is heated in an inductor to a temperature 30-50 ° C above the austepization temperature, then the workpiece is fed with feed S into the deformation zone, where it is continuously sequentially deformed first with a vibrating impact roller, and then with a calibrating static rolling roller, Al. out of the deformation zone, the workpiece is quenched in spoele

re.

The processing parameters are as follows: Deformation temperature, ° С950 + 20 Deformation energy, №20-30 Static preload force npvr vibro impact defgiglot, kN10 Roller impact frequency, Hz 20 Frequency of rotation of the workpiece 5, 5 Degree of deformation during vibro impact pair

Giving of preparation, mm / about

The diameter of the roller vibratory shock, mm / Diameter of the roller, mm Angle turn rollers

The diameter of the workpiece, mm

The degree of deformation during static rolling,% 10

I depreciate the in-motion vibro-impactor mechanism with a profile radius of 0 mm. Workpieces processed according to the offered method have accuracy

45

80 120

1 ° 50 50

53

55

ten

- 0 25

thirty

40

45

0

five

outer diameter, corresponding to grade 9-11, outer surface roughness R0 Ј 1.25 μm. There are no macrodefects on the surface with vice tracks of vibro-impact deformation, i.e. the accuracy and quality of the outer surface is increased,

In addition to these modes, the following were tested: the total degree of deformation was taken to be 15, 20, 40 and 45%, respectively. With a total degree of deformation of Ј 15% (vibro-impact deformation of 10% and static running around 5%, respectively), the required hardness of the workpiece is provided and the vibration-deformed feeds are not eliminated — there is a surface waviness of 0.2-0.3 mm, accuracy outer diameter corresponds to 14-15 grade. With a degree of deformation of 20 and 40%, respectively, the mechanical characteristics of the material and the accuracy of the outer diameter of the workpiece at the level of 9-11 quality are provided. Traces of vibro-impact deformation on the outer surface of the workpiece are absent. With a degree of deformation of 45%, no increase in the level of the mechanical characteristics of the workpiece material was found, the accuracy of the outer diameter remained at the level of 9-11 quality and local peeling (peeling) of the metal on the outer surface of the workpiece was observed, apparently due to over-clumping.

The same deforming rollers were tested with different aspect ratios. With equal diameters of the rollers of the vibro-impact mechanism and static rolling, the outer surface of the workpiece is not smoothed and the cutting of the vibro-impact treatment is eliminated. When the ratio of the diameters of the rollers is more than 1.5 (the diameter of the static rolling roller is more than 1.5 times the diameter of the roller of the vibro-impactor), the accuracy and frequency of the outer surface remain at the level of 9-11 quality and R l. 1.25 µm, respectively, but constructive difficulties arise - the axis does not fit into the roller, the mechanisms for adjusting the vibro-impact deformation and static rolling are complicated.

: 1 compared to the known proposed method and device allow

improve the accuracy of geometric dimensions and macro forms (cylindrical) of the mill roll blanks, as well as the quality of their outer surface due to the absence of traces of vibro-impact deformation, reduce the laboriousness of the rolls by reducing the share of machining during production.

Claims (5)

1. A method of manufacturing rolling mill rolls, including heating the workpiece to an austenitization temperature, vibro-impact deformation by a specified amount with a longitudinal feed of the workpiece and injection, characterized in that, in order to improve the quality by improving the accuracy of the geometrical dimensions of the rolls, vibro-impact deformation is carried out by a value of 15-30%, while simultaneously running a calibrating role with a degree of deformation of 5-10%. 2. A device for manufacturing rolling mill rolls, comprising a heating unit, rotational drives, a longitudinal feed system, a vibro-impact deformation unit with deforming and supporting rollers, a cooling system, characterized in that, in order to improve the quality by improving the geometrical dimensions of the rolls, the node deformation additionally contains a calibrating roller with a profile that coincides with the profile of the supporting rollers, and constitutes with them a closed caliber, and the calibrating roller is shifted in the feed direction by (0.3-0.5) of the width of its cylindrical part with respect to the deforming and supporting rollers and is located at an angle of 20-30 ° to the vertical axis in a plane perpendicular to the feed direction. 3. The device according to claim 2, characterized in that the deforming roller is made 1.3-1.5 times in diameter with a diameter smaller than the calibration roller. 4. The device according to p. 2, about t - it is due to the fact that the deforming roller is made in width, 1.31, 5 times smaller than the width of the sizing roller. 5. The device according to claim 2, characterized in that the deforming roller is made with a profile radius of 50-80 mm. WITH with - 20-30 Phage g Fig.Z 1