AU595068B2

AU595068B2 - Powder pressurizing mechanism in device for powder abrasive descaling of rolled stock

Info

Publication number: AU595068B2
Application number: AU79195/87A
Authority: AU
Inventors: Viktor Ivanovich Abramenko; Eduard Alexandrovich Garber; Jury Viktorovich Lipukhin; Boris Yakovlevich Orlov; Alexei Petrovich Osipov; Viktor Nikolaevich Ponosov; Gennady Nikolaevich Rumako; Anatoly Nikolaevich Subbotin
Original assignee: CHEREPOVETS VOLOG POLITEKH I
Current assignee: CHEREPOVETSKY FILIAL VOLOGODSKOGO POLITEKHNICHESKOGO INSTITUTA
Priority date: 1986-10-16
Filing date: 1987-06-19
Publication date: 1990-03-22
Anticipated expiration: 2007-06-19
Also published as: AU7919587A; BR8707502A; DE3790634T1; GB2209011A; WO1988002670A1; SU1490782A1; SE8802145L; FR2605255A1; SE463081B; SE8802145D0; JPH01501128A; GB8812974D0; GB2209011B

Description

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POWDER COMPACTING MECHANISM OF AN ABRASIVE POWDER DESCALER FOR ROLLED STOCK Field of the Art The invention relates to abrasive powder descalers for rolled stock, and more specifically, it deals with mechanisms for compacting powder.

The invention may be most advantageously used for descaling the surface of sheet, plate and section rolled stock and wire in production lines featuring high speed of rolled stock and high output.

The vital component of an abrasive powder descaler for rolled stock is a mechanism for compacting powder.

This mechanism performs an independent function: it presses abrasive powder against the surface of the rolled stock being descaled and retains it against slipping from the working zone of descaling under the action of friction forces between the abrasive powder and the surface of the moving rolled stock.

Irrespective of the specific construction of other elements of the descaler, the same design of the powder compacting mechanism can be used,in various abrasive powder descalers for rolled stock.

State of the Art Known in the art is a powder compacting mechanism of an abrasive powder descaler for rolled stock (SU,A,887048), comprising a working member in the form of a piston of a hydraulic cylinder. The surface of the working member which is ii. contact with the abrasive powder being compacted is positioned laterally with respect to a strip being descaled, opposite to one of the lateral edges thereof. This compaction mechanism does not carry out direct pressing of the abrasive powder against the strip being de-scaled so that efficiency of descaling is very low.

Known in the art is a powder compacting mechanism of an abrasive powder'descaler for rolled stock (PCT/SU, 86/00079), compriaing a working member 1 (Figure 1) engageable with a means for moving it towards the surface 2 of rolled stock 2 being treated which is coated with scale 3. The working member 1 is in the form of blades. The surface of the blades which is in contact with an abrasive powder 4 being compacted is curved to form a wedgelike structure which is defined by the magnetized abrasive powder 4 during movement of the rolled stock 2.

In this mechanism, the abrasive powder 4 is pressed against the surface of the rolled stock 2 being de-scaled and is held against loss due to being carried away along with the moving rolled stock 2 (resistance to drawing) by the same surface of the working member 1 in contact with the abrasive powder 4 being compacted. However, the problems solved by these two functions of the powder compacting mechanism are materially different. The abrasive powder 4 is pressed against the surface of the rolled stock 2 being descaled in a direction perpendicular to the direction of movement of the rolled stock 2. For that purpose, pressure ql q should be applied which is necessary to plunge the abrasive particles into the layer of scale 3 all the way through its thickness. If compression pressure of the abrasive powder 4 q, q, the abrasive particles will be forced into the layer of the scale 3 at a depth which is not sufficient to remove all the scale 3 from the surface of the rolled stock 2 being descaled. If compression pressure of the abrasive powder 4 ql> q, the abrasive particles of the powder 4 will pass through the layer of the scale 3 and will be forced with their sharp facets at a certain depth into the surface layer of the rolled stock 2 so that a part of metal will be removed together with the scale during the drawing of the rolled stock 2 being descaled through the descaler.

This is undesirable since such an operation causes loss of metal and impaired quality of the de-scaled surface of the rolled stock 2, while friction forces between the metal and abrasive powder 4 increase thus bringing about t an increase in energy consumption for drawing the rolled -3stock 2 through the descaler.

The experience has shown that the value of q=1-2 lMPa is sufficient for removing scale 3 from the rolled stock 2, e.g. of low-carbon steels.

To provide a resistance for drawing of the rolled stock 2 being descaled, apart from the force of pressing of the abrasive powder 4, the device for compacting powder should create a force applied to the abrasive powder 4 in a direction parallel to the direction of movement of the rolled stock 2 acting in opposition to this direction. The magnitude of this force should be equal to the force of drawing of the rolled stock 2 being de-scaled (based on the equilibrium conditions for the abrasive powder 4).

Therefore, if an external force F is applied to the mechanism for compacting powder, it is necessiry to ensure that this force F be resolved on the surface of the working member 1, which is in contact with the abrasive powder 4 being compacted, into two components: a force PF of pressure of the abrasive powder 4 against the surface being de-scaled, which is directed perpendicularly to this surface, and a force F 2 of resistance to drawing of the rolled stock 2 being descaled, directed in parallel to the surface of the rolled stock 2 being de-scaled. At the same time, as the external force P can only be resolved using rules governing resolution of vectors, it is not possible, in majority of applications, to resolve this force applied to the powder compacting mechanism into two components FP and F 2 that would have desired magnitudes at a time.

It can be seen from Figure 1 that

F

2 F sin

F

1 F.cosj (1) If the condition F 2

F

3 is met (wherein F 3 is the drawing force per one of the surfaces of the rolled stock /A being de-scaled), then -4- F F 3 F F 3 (2) sin l1 g On the other hand, as mentioned above, to enhance quality of descaling, it is necessary, that

F

1

F

1 min q.S (3) wherein S is the area of contact between the abrasive powder 4 and the surface of the rolled stock 2 being descaled; Fmin is the pre-set pressure force.

Equality of the values of F 1 derived from formulae and can only occur if the value of angle J will be as determined from combined solution of these equations:

F

3 tg q.S Calculations and studies show that in descaling rolled stock 2 to remove scale 3 when the rolled stock is of low-carbon steels the value of angle derived from is about 400 At the same time, as this angle is about equal to the angle of inclination of the working member surface of the powder compacting mechanism wjjh respect to the surface of the rolled stock 2, it is tot possible to provide such an angle of inclination in practice since the abrasive powder cannot be uniformly compacted along the length L of the working zone of the surface of the rolled stock 2 being descaled. The value of angle j being other than that specified above, the force of pressure will be lower or higher than the pre-set pressure.

If F 1

F

1 rain' a part of the scale 3 will be left on the surface of the rolled stock 2, which means that the de-scaling efficiency is lowered.

If PI >P 1 in' energy consumption for de scaling increases (an eXcess force of pressure adds to the drawing force), and results in higher metal losses.

Disclosure of the Invention It is an object of the invention to provide a powder compacting mechanism of an abrasive powder descaler for rolled stock having a working member surface which is so 5 constructed as to enh.nce quality of descaling for the rolled stock and to lower energy consumption for de-scaling.

This problem is solved by that in a powder compacting mechanism of an abrasive powder descaler for rolled stock, comprising a working member engageable with a means for moving the working member in a direction towards the surface of the rolled stock being de-scaled, according to the invention, the surface of the working member which is in contact with the abrasive powder being compacted is of stepped configuration with mutually perpendicular members defining two rows of mutually parallel members, respectively, the members of one row being capable of running in parallel with the direction of movement of the rolled stock.

This embodiment of the surface of the working member which is in contact with the abrasive powder being compacted features the following advantages.

The working position of the powder compacting mechanism is such a position in which the abovemelntioned surface of the working member acts upon the abrasive powder with a compression force directed towards the surface of the rolled stock being de-scaled. For example, if the working member of the powder compacting mechanism'is in the form of a blade (PCT,SU,86/00079) which is secured to a shaft, upon turning the shaft all points of the working surface of the blade will compress the abrasive powder while moving radially in planes perpendicular with respect to the surface of the rolled stock being de-scaled.

Therefore, this powder compacting mechanism can have an infinite variety of working positions rather than one position. On the other hand, if the surface of the working member of the powder compacting mechanism is made in accordance with this invention, when elements of one row of this surface will run in parallel with the direction of movement of the rolled stock, the 'force of presr 5 'sure of the abrasive powder against the surface of the -6rolled stock being descaled will be transmitted only through these elements, whereas the force of resistance to drawing of the rolled stock will only be developed on the elements of the surface of the working member which are perpendicular with respect to the surface of the rolled stock being descaled. As a result, it is sufficient to apply to the compacting mechanism a force equal to the pre-set force of pressure of the abrasive powder against the rolled stock to carry out de-scaling as follows: F= F 1

F

1 min There is no need in special application of the force of resistance to drawing (F 2 it will be developed on its own as a total of reaction forces on the abovementioned elements of the surface of the working member which are counter-balanced by the total bearing reaction at the point of attachment of the compaction mechanism to a casing of the abrasive powder descaler for rolled stock.

To ensure uniform compaction of abrasive powder along the whole length of the working zone of the surface of rolled stock being de-scaled, it is preferred that, with single-step configuration of the working member surface, each row have one element.

In fact, as the surface of the working member which is in contact with the abrasive povwder has one element only that runs in parallel with the surface of the rolled stock being descaled, the length of this element is essentially the length of th working zone in which the abraf sive powder is pressed against the surface of rolled stock being descaled. Since, in view of parallelism, the distance from the surface of the working member of the powder compacting mechanism to the surface of tne rolled stock being descaled is the same at all points along the length of the working zone, the abrasive powder is uniformly compacted lengthwise. T'his ensures uniformity of interaction conditions between the abrasive powder and suorface of the rolled stock being descaled, and, consiquently, enhanced quality of descaling. In addition, a smaller size of 2 -7the powder compaction mechanism is ensured in comparison with the orior art.

The element of the surface of the working member which can be arranged perpendicularly with respect to the direction of movement of the rolled stock may be mounted on a spring-biased plate 'which is movable in a direction perpendicular to the second element.

This facility ensures the following additional advantages in comparison with the prior art. If the working member of the powder compacting mechanism will press the abrasive powder to come close to the surface of the rolled stock to be descaled, the spring-biased plate will automatically rmove back by virtue of engagement with the surface of the rolled stock being descaled so as to compress the abrasive powder to a desired degree of compaction to avoid breakage of the working member of the powder compacting mechanism and rupture of the rolled stock. Owing to the spring bias, after the working member is moved back away from the surface of the rolled stock being descaled, the movable plate will return to the initial position.

It is preferred that the distance between the adjacent elements of one of the rows correspond to the average particle size of the abrasive powder being compacted.

This ensures an additional advantage to the powder compacting mechanism according to the invention: friction losses on the surface of the working member are minimized since one abrasive particle will be in each step of the working member surface and, when the rolled stock is drawn, sliding friction between the abrasive powder and the surface of the working member will be eliminated. If the pitch of the steps is smaller than the average particle size of the abrasive powder, a part of abrasive particles will be suspended without touching the surface of the working member, and, moreover a shift of abrasive particles relative to one another is possible under high pressressures which causes friction losses of energy and changes in compaction of the powder.

8 If the pitch of the steps is greater than the average particle size of the abrasive powder, several particles of abrasive powder instead of one can be in contact with the elements of the working member surface of the powder compacting mechanism so as to cause their sliding along these elements of the surface running in parallel with the surface of the rolled stock being descaled, Which results in energy losses through friction and in a decrease in the degree of compaction of the abrasive powder.

The provision of the powder compacting mechanism of the abrasive powder descaler for rolled stock according to the invention ensures; high quality of descaling since abrasive particles are forced into the scale layer throughout its full depth without inflicting damage to metal; minimum energy consumption since the pressure force is minimum requires for the purpose and does not cat.se any additional drawing force to overcome friction; minimum metal losses since abrasive particles are not forced into the metal layer.

Brief Description of the Drawings Specific embodiments of a powder compacting mochanism of the descaler for rolled stock according to the invention will now be described with reference to the accompanying drawins, in which Figure 1 shows a diagram of forces acting upon abrasive powder in a powder compacting mechanism of the prior art; Figure 2 is an embodiment of a powder compacting mechanism according to the invention having a working member surface which is of stepped configuration with mutually perpendicular elements forming two rows of mutually parallel elements, respectively, the distance between the adjacent elements of one row corresponding to an average particle size of the abrasive powder being compacted; i^i 11 «iftf 9 Figure 3 is an embodiment of a powvder compacting mechanism according to the invention with one-step configuration of the working member surface.

First Embodiment A powder compacting mechanism of an abrasive powder descaler for rolled stock comprises a working member 1 (Figure 2) engageable with a means 5 for moving it in the direction towards the surface of a rolled stock 2 being descaled. The surface of the working member 1 which is in contact with the abrasive powder 4 being compacted is stepped, with mutually perpendicular elements 6 and 7.

The elements 6 form a row of mutually parallel elements, each of which can be arranged in parallel with the direction of the movement of the rolled stock 2. The elements 7 of the surface of the working member 1 also form a row of mutually parallel elements of which each is arranged with a possibility of being positioned at right angles with respect to the direction of movement of the rolled stock 2. The distance between the adjacent elements 7 of one of the rows corresponds to an average particle size of the, abrasive powder 4 being compacted. The number of pairs of the elements per length L of the working zone of the surface of the rolled stock 2 being descaled is K=IL/a. This means that the number of the elements 6 parallel to the surface of the rolled stock 2 being descaled is equal to the number of the elements 7 arranged perpendicularly to the surface of the rolled stock 2 being deo scaled and is equal to the value of "PI.

The means 5 for moving the workinG member 1 in +,he direction towards the surface of the rolled stock 2 being descaled comprises a shaft 8 to which the working member I is attached by means of an arm 9 and a bushing The shaft 8 is connected to a rotary drive (not shown in the drawing) for the compression of the abrasive powder 4. Provided on the side opposite to the surface of the working member I which is in contact with the abrasive t "powderz 4 and adjacent to the vwcrking member 1 there is a magnetic circuit 11 of an electromagnet (not shown in the drawing) for magnetizing the abrasive powder 4.

Second Embodiment A powder compacting mechanism of a descaler for rolled stock comprises a working member 1 (Figure 3) engageable with a means 5 for moving it in the direction towards the surface of the rolled stock being decaled. The surface of the working member 1 which is in contact with the abrasive powder 4 being compacted is of single-step configuration and consists of two mutually perpendicular elements 12 and 13. The element 12 of the surface of the working member 1 can be arranged in parallel with the direction of movement of the rolled stock 2, and the elements 13 of the surface of the working member 1 can be arranged perpendicularly to the same direction. YWith this embodiment of the surface of the working member which is in contact with the abrasive powder 4 being compacted, the length L of the working zone of the surface of the rolled stock 2 cleaned from scale 3 is equal to the length of the element 12.

The element 13 of the surface of the working member 1 provided with a possibility of being arranged perpendi- Oularly to the direction of movement of the rolled stock 2 is mounted on a plate 14. The plate 14 provided with a spring 15 may reciprocate in a guide slot 16 made in the working member 1. The end of the plate 14 facing towards the surface of the rolled stock 2 being descaled is provided with an elastic shock absorber 17, e.g. of a fluoroplastic, which is attached by sunk screws to the plate 14 (not shown in the drawing).

The means 5 for moving the working member in the direction owards the surface of the rolled stock 2 being desdaled comprises an arm 9 by means of which the woking member 1 is attached dirootly to the magnetic circuit 11 of an electromagnet 18, between its pols 19 and The lower part of the magnetic circuit 11 having the pole 19 is received in the interior space of a shaft 8 having a rotary drive (not shown in the drawing).

The powder compacting mechanism of the abrasive powder descaler for rolled stock functions in the following manne r.

The rolled stock 2 (Figure 3) viith a layer of scale 3 thiereon is inserted into a chamber of the abrasive powder descaler (not shown) and is caused to pass throurgh the working zone of the length L which is defined by the ,,oxking member 1 of' the powder compacting mechanism and by an identical wiorking member snot shown) of the compaction toechanisM. which is provided at the opposite surfcoe of the rolled stock (not shown) and is stopped. The working member 1 is spaced from the sairf1Pce of the rolled stock, being deisled at a maximum distance that can be ensured by the construction Of the means 5 so as to faollitatt loading of the abrasive Powder 4. The vorking zone between the orin me mb ez r and~ the Osirface 2 being esaedifled, u(eg. from the top) withi the ferromagnetic abrasive powder 4, the elootromaenet 16 is energized, and magnetic flox starts fl.owing in Its magn.etic circuit 11 to penetrate, throui gh the polo 20, the layer' of the abrasive powder 4 ii the diroctima pe'rponicaroth urac of the rolled. stock 'r -eled. The abrasive powder 4, which is nianeti .z to be fe-J.il an~d is held between the -ittr~ 1 and the owrfaoe Qf the rolled otook beir, dece-L~cd as k- The dr~ive of the shaft 8 (not chown) Is elarized to iMpart through the arm 9 movement to the vlorkini metaber 1 of the powder' corn pa.cting moohsniom which star~ts OoMpreesinL the abrasive ovder 4 and Pressing it aeainot the ourface of the rolled stock 2 baing deoaW4 aV1 O t thle surface of the Woz'kin6 Mtmw qqlm posli=o pwoalloi t~o the 5arrfatn tQolc 2 being descaled so that 355 rorer Pzra' I VMwdarx 4 deve).op at there elemento) ,ae foraos being. min. If r- r i i

I~

-12 the surface of the working member 1 is of the single-step configuration (Figure 3) and consists of a pair of mutually perpendicular elements 12 and 13, the force that presses the abrasive powder 4 F 1

=F

1 min develops between the element 12 and the abrasive powder 4. Owing to the force FI, the particles of the abrasive powder 4 are forced irto the layer of scale 3 and reach the surface of the rolled stock being descaled without, however, entering therein. Then a mechanism for drawing the rolled stock is switched-on (not shown), and the rolled stock 2 starts moving (upwards in the drawing) so that drawing force F 3 acting vertically up starts acting upon the abrasive powder 4 on the part of the rolled stock 2. This results in that the abrasive powder 4 starts to press against the elements 7 of the surface of the working member 1 (Figure 2) or against the element 13 (Figure 3) of the surface of the working member 1 (in the second embodiment). By virtue of this pressure, forces of resistance to drawing develop on the elements 7 (Figure 2) of the surface of the working member 1 which are perpendicular to the surface of the rolled stock being descaled, the sum of which forces

F

2 is equal to drawing force F3 and is directed towards the force F 3 (based on the equilibrium condition of the abrasive powder The same force F 2 (Figure 3) develops on the element 13 with the single-step configuration of the working member 1. Owing to the force F 2 the abrasive powder 4 is held within the working zone of descaling and is not lost with the rolled stock 2. As a result, abrasive 4 particles of the powder 4 remain stationary in contact with the surface of the rolled stock 2 being descaled and destruct the layer of scale 3. The force F 2 or resistance of the rolled stock 2 to drawing is transmitted from the surface of the working member 1 through the arm 9 to the shaft 8 wherein it is counterbalanced by bearing reaction forces in bearings of the shaft 8 which are not shown in At. he drawing. Therefore, unlike the device of the prior 'W art, irrespective of the shape of the surface of the work- -rrr- i i i crpgj~ 13 ing member 1 and angle P (Figure 1) in the resolution of the force pressing the abrasive powder against the surface of the rolled stock being descaled, force of pressure F 1 of the abrasive powder 4 in the embodiments of the device according to the invention can be equal to

F

1 min* This force ensures forcing of the abrasive particles of the powder 4 into the layer of scale 3 throughout its full depth, but at the same time abrasive particles cannot damage the metal layer under the layer of scale 3 since this force is not enough for the abrasive particles to penetrate into the metal layer. As a result, in comparison with the prior art where compliance with the condition F 1

=F

1 min could not be guaranteed, in the embodiments according to the invention, the surface of the working member 1 ensures enhanced quality of descaling of the surface of the rolled stock 2 to remove the layer of scale 3, lower metal losses and reduced force for rolled stock drawing.

Thus, for example, tie complicance with the condition FP F 1 min in the prior art can only be achieved if the value of angle P 40° (Figure It is difficult in practice to provide an angle p >200 since the lower part of the working member 1 of the powder compacting mechanism will be spaced at a large distance from the surface of the rolled stock being descaled, and the abrasive powder will not be uniformly compacted along the length L of the working zone of descaling. With 200, the average force that presses the abrasive powder 4 against the surface of the rolled stock being descaled is 2-3 times as great as q as shown by calculations and studies. As a result, in comparison with the powder compacting mechanism according to the invention, the force for drawing the rolled stock 2 in the prior art device is 1.3-1.5 times as great (since the drawing force depends not only on ql but also on strength of the layer of scale Consequently, in the powder compacting mechanism according to the invention the energy consumption 14 for drawing the rolled stock is 1.3-1.5 times as low, and quality of microgeometry of the surface of the rolled stock 2 from which the scale 3 has been removed is about one grade better, whereas metal losses are 1.2-1.5 times as low.

During drawing of the rolled stock 2 through the powder compacting mechanism having the working member 1 with the surface thereof in contact with the abrasive powder 4 made as described in the first embodiment (Figure 2), abrasive particles of the powder 4 are disposed in steps defined by adjacent mutually perpendicular elements 6,7 of the surface of the working member i, and a single abrasive particle is located in each step. Owing to this, there is no displacement of abrasive particles of the powder 4 on the elements 6 which are parallel to the surface of the rolled stock 2 being descaled during drawing so as to eliminate sliding friction between the abrasive powder 4 and the surface of the working member 1 in contact therewith thus saving energy.

During drawing of the rolled stock 2 (Figure 3) through the powder compacting mechanism having the working member 1 with the surface thereof in contact with the abrasive powder 4 which surface has single-step configuration, the element 12 mounted with a possibility for being parallel to the direction of movement of the rolled stock 2 and the element 13 being perpendicular with respect to the direction of movement, the abrasive powder 4 is uniformly compacted along the length L of the working descaling zone. This enhances quality of removal of the scale 3 along the whole length L of the working descaling zone of the surface of the rolled stock 2. If the compaction of the abrasive powder 4 by application of the initial force Pl proved inadequate to remove the scale 3 from the surface of the rolled stock 2 being descaled, the shaft 8 is further turned to bring the working sturface A of the working ember 1 closer to the surface of the roll- 15 ed stock 2 being ;descaled. In this case the elastic shockabsorber 17 can touch the surface of the rolled stock 2 being descaled and a reaction force reoelling the plate 14 away from the surface of the rolled stock 2 may develop.

The spring 15 is compressed, the plate 14 is received in the guide slot 16 to a larger depth, and the force of pressure of the plate 14 against the surface of the rolled stock 2 will be determined, not by force F 1 but by a low force of compression of the spring 15. Owing to this, and also because of the provision of the elastic shock-absorber 17, the contact between the plate 14 and the surface of the rolled stock 2 will not hamper the drawing of the rolled stock through the abrasive powder descaler for the rolled stock, and no defects or marks Will appear on the surface of the rolled stock after descaling. After retraction of the working member 1 of the powder compacting mechanism away from the surface of the rolled stock 2, the spring will return the plate 14 to the initial position. Upon further rotation of the shaft 8 clockwise (if it is desired to enhance compaction of the abrasive powder the working member 1 of the powder compacting mechanism may take a position in which the element 13 of the surface of the working member 1 arranged at right angles with respect to the surface of the rolled stock 2 will be at an angle greater than 900 with respect to this aurface. However, such further rotation does not eliminate the abovementioned advantages: the abrasive powder will be reliably held against drawing in a rectangular recess defined by the elements 12 and 13 of the surface of the working member 1, and the movable plate 14 will, as before, take-up all force developed by virtue of drawing of the rolled stock.

The employment of the powder compacting mechanism according to the invention, in comparison with the prior art, makes it possible to enhance descaling quality, to reduce energy consumption for drawing of the rolled stock by about 35-50% and to decrease metal losses by 20-50%o.

16 Industrial Applicability Tb' invention may be most advantageously used for descaling sheet, plate and section rolled stock and wire in production flow lines featuring high velocity of the rolled stock and high output.

14 C

I

Claims

17- CLAIIIS: 1. A powder compacting mechanism of an abrasive powd- er descaler for rolled stock, comprising a working member engageable with a means for moving thereof in a direction towards the surface of a rolled stock be- ing descaled, c h a r a c t e r i z e d i n t h a t the surface of the working member which is in cuntact with the abrasive powder being compacted is of stepped configuration with mutually perpendicular elements (6,7) forming two rows of mutually parallel elements respectively, 'Ihe elements of one row being capable of running in parallel with the direction of movement of the rolled stock 2. A mechanism according to claim 1, c h a ra c t e r i z e d i n t h a t, with single-step configu- ration of the surface of the working member each row has one element (12,13). 3. A mechanism according to claim 2, c h a r a c t e r i z e d i n t h a t the element (13) of the sur- face of the working member mounted with the provisition for being arranged perpendicularly to the direction of move- ment of the rolled stock is located on a spring-biased plate (14) which is positioned with a possibility of being moved in a direction perpendicular to the second me'- ber (12). 4. A mechanism according to claim 1, h a r a c t e r i z e d i n t h a t the distance between the adjacent elements of one of the rows corresponds to the average particle size of the abrasive powder being compacted. I* 18 POWDER OULIPACTIKO L,-'EC!1AY!IS$A OF AN ABRASIVE POWDER DEL CALER FOR IROLLLt D S TOOCK Abstract A powder compacting., mechanism for an abrasive pow der descaler for rolled stock has working. mebreggle with a means for moving, it in a direction towards the surface of a rolled stock being descaled. The sur'- face of the w!orking member which is in contac,.t wiith the abrasive powder bEingv compacted is of stepped configuration with mu~tually perpendicular elements (6,7) forming two rowvs of mutually parallel elements. The ele- ments of one of the rows are capable of ruannling in parallel with the direction of movement of the 1-o~ed stock