RU2187396C2 - Roll of shape bending mill - Google Patents

Abstract

FIELD: plastic metal working, namely equipment for making bent rolled shapes. SUBSTANCE: roll of shape bending mill includes detachable arbor with threaded joint having two halves of non-equal length values. Large half of arbor has bead for fixing forming members of roll, it is arranged at side of mill drive unit and includes threaded zone for locking nuts. Generatrix of small half of arbor in place joined with its large half has at least two through grooves in front of which in end of threaded zone of large half of arbor there are drilled openings designed for placing fixing studs into them and into above mentioned through grooves. EFFECT: lowered labor consumption for making roll. 2 cl, 2 dwg, 1 ex

Description

 The invention relates to rolling production and can be used in the manufacture of cold-formed long sections.

 Such profiles are made on continuous or semi-continuous roll forming mills equipped with duo stands, in which work (forming) rolls are installed. Compound rolls, consisting of an axis (shaft), workers (forming) and distance elements fixed by lock nuts, are most widely used. Such rolls have an important advantage over solid rolls: the ability to reuse the axles when changing (transferring) worn forming elements, or when switching to the manufacture of a new profile. The designs of modern roll forming rolls are described, for example, in a book under the editorship of I.S. Trishevsky. "Production of bent profiles (equipment and technology)", M., "Metallurgy", 1982, S. 3556-364.

 A roll forming mill tool is known, the work rolls of which are made in the form of profile elements (washers) placed on the axis and profile bushings, which, unlike rigidly mounted washers, are mounted on rolling bearings, i.e., with the possibility of free rotation about the axis (see USSR AS 388811, class B 21 D 5/06, B 21 B 1/08 dated 12/14/73).

 Also known is the roll of the working stand of a profile-flexible mill having additional spacing elements and a transitional sleeve made up of several bushings: mechanical ones with pressure flanges and intermediate ones (see AS of the USSR 551076? Class. B 21 D 5/06 from 05.16.75 g.).

 A disadvantage of the known designs of roll forming rolls is the high labor costs associated with the need to remove pillows with rolling bearings from the ends of their axles (trunnions) during disassembly for the purpose of regrinding (repair) of worn working elements, and during assembly, performing the reverse operation. Closest to the claimed object is a roll roll forming mill according to US Pat. RF 2049573, class B 21 D 5/06, B 21 D 37/00 dated 05/06/93, publ. BI 34, 1995

 This roll contains a detachable axis with a threaded connection, consisting of two semi-axes of unequal length, one of which has locking parts, and the larger of which has a flange for fixing the forming elements of the roll.

 Indeed, in order to achieve a minimum radial "runout" (which improves the quality of the molds and reduces the wear of the elements making up the roll barrel), the roll axis during profiling is necessary to grind the axis in the assembly during its manufacture, i.e. both axles at once. However, due to the significant tangential loads on the surface of the axis during this operation, a periodic unscrewing of the threaded joint will inevitably occur with known negative consequences.

 In addition, due to significant dynamic overloads (impacts of the front end of the moldable strip into the roll barrel) during piecewise profiling, the lock nut located on the minor axis and abutting against the barrel end face is subject to increased wear, which is also facilitated by its connection to the roll drive (vibration).

 The technical problem solved by the invention is to reduce labor costs by improving the operational qualities of the roll and extending its working campaign.

 To solve this problem, the roll of the roll forming mill contains a detachable axis with a threaded connection, consisting of two semi-axes of unequal length, lock nuts on one of which and a flange for fixing the forming elements of the roll is made on the major axis, the major axis is located on the drive side of the mill, threaded the section for accommodating the locking nuts is made on the major axis, at least two through grooves are made on the forming surface of the minor axis, and at the end of the threaded section of the major axis is opposite the well holes for the minor semiaxis drilled holes for placement in them and the said through grooves of the fixing pins.

 The roll is intended for use in a medium bending mill.

 The essence of the claimed technical solution lies in the fact that both half shafts of the roll can be fixed from mutual rotation both when grinding the axis in assembled form, and during profiling. In addition, lock nuts (two - a nut and a lock nut) are located on the semi-major axis from the control side of the mill, which, firstly, improves the "locking" of the barrel elements, and, secondly, allows you to control the nuts (and the entire threaded connection ) during the operation of the mill. At the same time, the main advantage of the roll taken as the closest analogue is retained: the possibility of its lightweight assembly and disassembly (see above).

Figure 1 shows the inventive roll roll forming mill. The roll contains a collapsible axis consisting of a small 1 and a large 2 semi-axes, fastened with a threaded connection 3, the thread direction of which is opposite to the specified direction of rotation of the roll. Each of the semiaxes has axles 4 for bearings (rolling bearings). A protrusion is made at the end of the minor axis 1, and a threaded hole corresponding to the protrusion at the end of the major axis 2. Figure 2 is a section along AA of figure 1
The end of the axle shaft 2 from the drive end ends with a section 5 with a keyway 6 and serves to place a drive clutch (not shown) on it. In addition, on the drive side of this axle shaft there is a flange 6, which fixes the forming elements of the roll barrel (shown by a dotted line) mounted on the key 7. From the control side of the mill, these elements are fastened with nuts 9 (also dashed) installed on the threaded section 10 of the major axis, the direction of the thread of which coincides with the direction of rotation of the roll. On the forming surface of the larger diameter of the minor axis, narrow through grooves 11 are made (there are four of them in FIG. 1), in which, when grinding the axis (and, if necessary, during the work of the roll), the pins 12 are inserted into the corresponding holes drilled at the end of the threaded section 10 of the semi-axis 2.

 Roll assembly sequence. On the semi-major axis, the trunnion of which is installed in the bearing (and the roll cushion), the forming elements of the barrel 8 are inserted until they stop in the flange 6, after which the nuts 9 are screwed; then the semi-minor axis (also with bearing and cushion) is screwed into the threaded hole of the axle shaft 2 and (if necessary) is fixed with pins 12. The assembled roll with cushions is installed in the mill cage. Dismantling the roll in the reverse order.

 An experimental verification of the roll of the proposed design was carried out on a medium-type roll-forming mill (according to the classification given in the reference book under the editorship of IS Trishevsky. "Production and use of bent sections of rolled metal", M., Metallurgy, 1975, p. 132, table. 16 - for a workpiece 1 ... 4 mm thick and 50 ... 300 mm wide) 1-4 • 50-300 of OJSC Magnitogorsk Iron and Steel Works.

 For this purpose, in an additional group of mill stands, consisting of three stands and located behind the flying scissors, rolls of the claimed design were installed. Since profiles already cut into measured lengths enter this group of stands, the experimental rolls were tested under the most unfavorable conditions - by piece profiling and in finishing stands, where the minimum radial runout of the rolls is especially important.

 In the experiments, not a single case of unscrewing the axle shafts was noted, and the geometry quality of the bent profiles was at the same level as when profiling with rollers with solid axes, usually used on the mill. Profiling with rolls made according to US Pat. RF 204573 (see above), worsened the quality of the profiles and in some cases led to a stop of the mill, which is explained by the unsuitability of these rolls for defect-free piece-by-piece profiling on mills of the middle type.

 The use of the proposed roll on a heavy mill 2-8 • 100-600 with a single-piece profiling process did not give the desired results. The use of this roll on light type mills is impractical, since in most cases such mills are made with cantilever (i.e., single-bearing) fastening of work rolls. The operation of the experimental rolls also showed that with one locking pin, it is necessary to increase its diameter (and groove width) to values that weaken the strength of the minor axis.

 Thus, an experimental verification confirmed the acceptability of the technical solution found to fulfill the task and its advantages over a known object.

 According to the Central Laboratory of MMK, the use of the declared roll on medium-type roll forming mills with a single-piece process will reduce production costs (by extending the working campaign of the rolls and rolling bearings, as well as reducing the wear of the journal axes of the roll axes) by no less than 10%, which will accordingly increase profit from the sale of bent profiles.

Concrete example
The roll of a medium-type roll forming mill using a single-piece profiling process contains (see Fig. 1) a detachable axis consisting of two half shafts fastened with a detachable connection.

The main diameter (for planting barrel elements) of the semi-major axis D = 75 mm, barrel length L = 300 mm. The diameter of the threaded section (under the lock nuts) of this axis is 3M72 • 2 mm, its length l _p = 60 mm.

 The maximum diameter of the minor axis d = 72 mm, the value of 1 = 15 mm. On the section "l" - 4 through grooves 4 mm wide; holes for pins (at the end of the semi-major axis) with a diameter of 4 mm.

 A threaded protrusion 55 mm long with a diameter of 2M36 • 2 is made on the minor axis; the corresponding hole on the semi-major axis has a depth of 57 mm.

Claims (2)

 1. Roll of a roll forming mill containing a detachable axis with a threaded connection, consisting of two semi-axes of unequal length, lock nuts on one of which, and a flange for fixing the forming elements of the roll, made in that the major axis is located on the drive side the mill, the threaded section for accommodating the locking nuts is made on the major axis, at least two through grooves are made on the forming surface of the minor axis, and at the end of the threaded section of the major axis opposite the well holes for the minor semiaxis drilled holes for placement in them and the said through grooves of the fixing pins.  2. The roll according to claim 1, characterized in that it is intended for use in a medium bending mill.

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