JPS5993219A - Method and device for obtaining accurate length of section generated by shearing bar steel and billet material in orderto be used as blank for solid deformation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for obtaining accurate lengths of sections resulting from lft cutting of steel bars and billet materials for use as stock for solid deformation.

Materials for solid deformation are mainly produced by shearing steel bars or billet materials.

This is because this is a parting process without material loss. Furthermore, the productivity is significantly greater than with the remaining new methods such as sawing, fusing, folding, etc.

Measuring methods are known which make it possible to measure the dimensions of a billet before or after shearing, and thus to divide the billet into equal sections of volume. However, such a method is only meaningful if it succeeds in precisely observing the section length, which is measured to correspond to the target volume.

For cost reasons, the aim is to process as much billet, ie material, from the pre-rolling line as possible. However, in this case, using a conventional shearing device would result in
Volume fluctuations of up to 4% occur. It is of course necessary to eliminate volume fluctuations, since such fluctuations can lead to problems in the next production stage, such as incorrectly formed parts, excessive tool wear, overloading of tools and machines, etc. It is. Variations in the volume of the cut blocks that occur during shearing are therefore caused, on the one hand, by large manufacturing tolerances of the half-tablets (billets) and, on the other hand, by machine and tool influences.

When adjusting the length of the section to be sheared, it is known to transport billets etc. through the shear by a roller table to a stop on the outflow side of the shear, in which case the feed is carried by driven rollers of the roller table. is produced. In order to be able to feed the billet, the rollers of the roller table are generally The level will be raised. A shearing stroke is then produced by the contact connection between the stop and the billet. Before the cutting, a hold-down device is activated to lower the roller table, thus protecting the four-ra table against impacts of the billet caused by the shearing process.

Furthermore, it is possible to prevent the stone ξ from being reversed during cutting and thus to cause the sheared section to become clamped between the stone and the knife. In this case, it is unavoidable that the position of the billet etc. also changes in the axial direction of the billet when the roller table is lowered.

When the roller table is roughly lifted up, the contact surface of the stone ξ against the billet is arbitrarily located within the fracture surface of the shear surface, which is not flat, and the position of the contact surface is shifted when the roller table is lowered, resulting in mismatch. may occur.

Therefore, the roughness of the fracture surface and the fracture course give 11 to the section length. Furthermore, the pressing force of the pilet to the stopper and thus the elasticity, play, etc. of the stopper are related to the variable properties of the billet and the coefficient of friction between the driven rollers and the billet, etc. , and also when the length of the billet is shortened, an inaccurate position relative to the stone/e occurs during the lowering of the roller table,
This also results in segment length inaccuracies. The feed force of the roller table varies depending on the support of the billet on the corresponding bearing of the hold-down device. This support appears when the billet or the like has a large bend or when the center of gravity of the shortened end of the billet is unfavorably located. Similarly,
The spacing of the rollers and the arrangement of the rollers on the roller table have an effect on this relationship.

By counteracting influence quantities on the machine side, the required fixed volume of up to ±05% with conventional shearing devices can be reduced even with optimally adapted tools and a constant billet cross section, especially in the case of relatively short sections. is not supposed to be obtained.

Furthermore, the measurement method for determining the required section length requires specific tolerance ranges, so that the tolerances from mechanical influences must clearly lie below the maximum permissible volumetric tolerances. The invention is based on the recognition that these volume fluctuations occur within the entire equipment of the shear, namely the material feed, the hold-down device and the stop. The object of the invention is to provide a shear structure which makes it possible to reliably reduce the aforementioned volume fluctuations to the required volume tolerances. A maximum volume tolerance of 0.5% is considered as a constant volume shear assumption. In the present invention, the billet, etc. is lifted from the shearing level for a short time and transported through the shear by a roller table to the stock tip ξ on the outflow side of the shear, and then the billet, etc. is pressed by a pressing device toward the corresponding bearing part, and then the billet, etc. [1 between ξ and billet
There is a type that generates a shearing stroke through the connection, and after passing the billet etc. into the working chamber of the shear, the shearing level is held without changing, and the billet is forcibly fed to the stopper with a constant feeding force. It is characterized in that during the feeding process, the billet is pressed and held against the corresponding bearing of the holding down device with a holding down force of a predetermined magnitude, and then the billet is fixed by a holding down force of a higher magnitude.

In adjusting the segment length according to the invention, it is important that the shear level is not changed except in the case of short threading runs. Rather, the billet, etc., is held and guided reliably and forcibly when approaching the stone, a, and is therefore subject to other disturbances, such as changes in position of the billet, etc. during the lowering of the roller table, and variable changes in the billet that it attempts to shear. The inherent weight, coefficient of friction between the driven rollers and the billet is reliably eliminated. The feeding force is designed in such a way that it is possible to transport the PIRENO without any problems. The billet continues to be controlled and guided satisfactorily as it approaches the stock ξ. Eliminating unfavorable volume fluctuations of the segment and clearly ±0.
It is possible to reduce the volume tolerance to less than 5%. This provides the prerequisites for accurate and consistent forging, which provides significant advantages for the parts to be forged. Very small dimensional variations of the parts are obtained, which makes it possible to produce working surfaces ready for installation without further work. Furthermore, it is possible to save weight when forging without gaps compared to forging with ζ warping. This results in a good grain flow line, which results in high durability strength for the forged part.

After the segment length is adjusted, the billet, etc. is clamped between the feeding device and the stock horn ξ with a constant feeding force until a relatively high pressing force becomes effective. should be kept rare. The maximum possible feed distance of the feed device with a constant feed force is kept greater than the maximum length of the section to be sheared. This ensures that the guidance of the billet, etc. up to the stone ξ is maintained until the billet, etc. is fixed for the shearing process.

According to another feature of the invention, the structure of the billet shear is constructed as follows. That is, the clamping device is equipped with at least two power stages, one power stage taking over the guidance of the billet during one stage of positioning and the other power stage securing the billet etc. during the shearing process.

The further hold-down device advantageously has a lower force effect than the force exerted by the hold-down device which serves to secure the workpiece, in which case the further hold-down device is fitted with a slipping force-transmitting connection such as a bead, etc. It acts on This is advantageously carried out via at least one roller, etc. 1, so that the frictional forces acting in the direction opposite to the feeding force when feeding the beam can be kept as low as possible.

The above-mentioned further holding down device may be installed in the holding down device (which serves for fixing the moss) (in this case the holding down device may be of a power unit, for example hydraulic), or may be pneumatic. It may also be a piston-cylinder unit that is actuated, in which case the crimping force G
This allows for a certain degree of flexibility.

Another characteristic of the invention is that the feeding device Q) with a constant feeding force advantageously consists of a tong force (Q) which grips the billet, the tongs being able to tighten the billet etc. with a constant force and which After the table has stopped, I will take over the G-ko delivery.

These surfaces should be the flat surfaces of the shear plane at the beginning of the cut, since the stone 9 faces always come into contact with the same face in the shear plane when approaching the stopper by forcibly guiding the billet. This is because it is only at this position that it is possible to create a constant section length. Stone ξ
In order to suppress the surface pressure between the billet and the billet as little as possible, the shape of the stopper surface must match the shape of the above-mentioned cutting start surface.

Since the billets, etc. are guided by means of a feeding device with a constant feeding force, and in this case the displacement of the roller table in height is no longer determined, the entire roller table can be used as an elastic shock absorber or the like. supported on the
Therefore, the mortar table can be deeply protected against the impact of the billet caused by the shearing process.

The invention will now be described in detail with reference to the drawings.

In the illustrated shear 1, a drive cylinder 3 is placed between two frames 2.
and a lower knife holder supporting the lower shearing knife 5, these parts forming a fixed structural unit. The knife holder is at the same time a corresponding bearing part of the holding down device. It's useful. The drive cylinder 3 has a drive piston 6 which is equipped with an upper knife holder 7;
The knife holder 7 holds an upper knife 8. A further drive piston 6a for the hold-down device 9 is arranged in the drive piston 6. Lower knife holder 4
A counter-holding device 4a is arranged at , which in its lower part is designed as a cylinder and cooperates with a stationary piston 4b.

On the outflow side of the shear, a device 1o is provided for adjusting the section of the pyrene 11 to be processed, which adjustment can advantageously be carried out by means of a serze motor 12.

A stop 13 for the billet 11 is arranged on this length adjustment device 10 . The contact surface 13a is adapted in its position and shape to the starting surface in the shear plane. For this purpose, the length adjusting device 10 is displaced and fixed in its height position on the rail 10a.

A feeding device 14 is arranged on the inflow side of the shear, which feeding device 14 has clamping jaws 15 and 16, between which the clamping jaws 15 and 16 are arranged.
TS) Capture 11. Tightening jaws 15 and 16 are attached to rod 1
The male stone cylinder unit 17 connected to the billet 8 is moved to the tightening position against the billet 11. In this case, the clamping jaws 15, 16 form tongues, which clamp the pirene 11 with a constant force. cylinder 1
9 serves to provide feed for the tongs. code 2
At 0 the support for the feed device 14 is shown.

A roller table 21 having rollers 22 is provided on the inflow side of the feeding device 14 .

On the driven roller 22 of the roller double 21, 1
Roller 22 and tong member 15.16 with two edges down
The billet 11 located inside is conveyed into the feeding device 14. For this purpose, the roller table 21 is lifted by the lifting cylinder 23 until the billet 11 can flow freely into the press chamber. Advantageously, the roller table 21 rests on an elastic three-impact device 24.

The hold-down device 9 is equipped with at least two power stages. During the shearing process, the first power stage
The piston 6a serves to fix the . A further power stage with relatively low force effects is formed by a piston-cylinder unit 25 whose piston 26 is connected via a piston rod 27 to preferably at least one roller 28 .
acts on billet 11, in this case billet 'X
There is a power transmission connection that slips in first order. Is the further hold-down device, namely the piston-cylinder unit 25, operated by a power unit, for example hydraulically or pneumatically? You can do it. The second JT power stage in the form of the holding device 25 takes over the guidance of the billet 11 etc. when positioning it with the stopper 13a. In this case, the billet being fed is held against the corresponding bearing 4 of the holding down device.

After the billet 11 etc. is adjusted in section length, a higher pressing force by the pressing device 9 becomes effective, and until the billet is fixed,
The feed device 14, 19 tightens and holds the feed device between the feed device and the stopper 13 with a constant feeding force. The feed device 14,19 is then transferred back to the starting position by the cylinder unit 19 after the clamping jaws 15 and 16 have been released.

The roller table 21 is lifted by the lifting cylinder 23 until the billet 11 can flow freely into the press chamber. For the next shearing process on the same billet, the roller table 21 remains in the lowered position without being driven, with the roller table 21 resting on an elastic damper 24. In this case, transport of the billets is taken care of entirely by the feeding device 14.

[Brief explanation of drawings]

The drawing is a schematic side view, partially cut away, of a hydraulically driven billet shear with an embodiment of the device according to the invention. DESCRIPTION OF SYMBOLS 1... Shear, 2... Frame, 3... Drive cylinder, 4... Knife holder, 4a... Corresponding holding device, 4
b... Piston, 5... Shear knife, 6.6a.
... Drive piston, 7... Knife holder, 8... Knife, 9... Pressing device, 10... Length adjustment device, l○a... 1 knoll, ] 1... Billet, 12
... Ser soup 2 motor, 13 ... Stotsuno ξ, 13a
...Contact surface, 14...Feeding device, 15.16...
Tightening jaw, 17... Piston cylinder unit, 1
8... Rod, 19... Cylinder, 20... Support, 21... Roller table, 22... Roller, 23
...Lifting cylinder, 24...Buffer device, 25...
Piston cylinder unit, 26...Piston, 27
...Piston rod, 28...Roller

Claims (1)

[Claims] 1. A method for obtaining accurate lengths of sections produced by shearing between rods and billet material for use as material for solid deformation, the method comprising The billet is then lifted up for a short period of time and conveyed through the shear to the stock tip ξ on the outflow side of the shear using a roller table, and then the billet, etc. is pushed toward the corresponding bearing part by a holding device, and then the billet In the case of a type in which the shearing process is started by a contact connection between
During this feeding process, the billet is held against the corresponding bearing of the clamping device by a clamping action of a predetermined magnitude, and then by a clamping force of a higher magnitude. A method for obtaining exact lengths of sections produced by shearing steel bars and billet material for use as raw material for solid deformation, characterized in that fixation of the billet is carried out by force. 2 After the section length is adjusted, the billet, etc. is tightened between the feed device and the stock ξ with a constant feed force until a higher pressing force becomes effective. The method according to claim 1, which is held in: 3. The method according to claim 1 or 2, wherein the maximum possible feed distance of the feed device with a constant feed force is greater than the maximum adjustable length of the section to be sheared. . 4. The method according to any one of claims 1 to 3, wherein a pressing action of a predetermined magnitude is applied to the billet, etc. during positioning of the billet, etc. 5. Apparatus for obtaining precise lengths of sections produced by shearing steel bars and billet materials for use as raw material for solid deformation, with a driven roller table in which the billets, etc. are moved through the working chamber of the shear. The roller table is lifted up and then lowered again to allow the bit to pass through to the stone A on the outflow side of the shear, and the bit is fixed by a holding device against a corresponding bearing of the holding device. In those types in which the shearing stroke is initiated by a contact connection between the stone, o and the billet, a feeding device (14) with a constant feeding force is provided above the shearing level as a further conveying device. and the holding device (9) is equipped with at least two power stages, one of which is a power stage (25) which, when positioning with the stone of the divisions resulting from shearing steel bars and billet material for use as material for solid deformation, characterized in that the other power stage (6a) takes over the guidance and fixes the billet etc. during the shearing process. A device for obtaining accurate lengths. 6. In addition to the pressing device (9) for fixing the Pireno (11), another pressing device (26, 2) whose force is smaller than that of the first pressing device (9) is used.
7) is arranged, and the pressing device (26, 27
6. The device according to claim 5, which acts on pyrene) (:l-1) etc. with a slipping force transmission connection. 7. The force transmission of the other pressing devices (26, 27) to the billet (11) etc. is carried out by at least one roller (
28). 8 Holding down device (9) useful for fixing the above
8. Device according to any one of claims 5 to 7, in which a further hold-down device (26, 27) is integrated. 9. Any one of claims 5 to 8, wherein the other pressing device fit (26, 27) is a piston cylinder unit that is operated, for example, hydraulically or pneumatically by a power device. Equipment described in Section 1. 10. Any one of claims 5 to 9, wherein the reciprocating distance of the feeding device (14) having a constant feeding force is greater than the maximum length of the section to be sheared. Equipment described in Section 1. 11. Another power stage (6a) of the holding device (9)
The feeding device (14) has a constant feeding force until the
11. A device according to any one of claims 5 to 10, adapted to operate. 12 The feeding device (14) with a constant feeding force is a pair of tongs (15° 16) that catch the billet (11) etc., and the tongs tighten the billet (11) etc. with a constant 0 force and the roller table ( Device according to any one of claims 5 to 11, in which the device takes over the feed after the stop of step 21). 13. The stop 772 surface (13a) of the stopper (13)
13. Apparatus according to any one of claims 5 to 12, in which the cutting edge) is adapted to the position and shape of the starting surface within the shear plane. 14. Device according to any one of claims 5 to 13, wherein the roller table (21) is supported on an elastic damper (24), for example a rubber damper.