Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D25/00—Machines or arrangements for shearing stock while the latter is travelling otherwise than in the direction of the cut
  • B23D25/02—Flying shearing machines
  • B23D25/04—Flying shearing machines in which a cutting unit moves bodily with the work while cutting
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D15/00—Shearing machines or shearing devices cutting by blades which move parallel to themselves
  • B23D15/12—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor
  • B23D15/14—Shearing machines or shearing devices cutting by blades which move parallel to themselves characterised by drives or gearings therefor actuated by fluid or gas pressure

Definitions

• the present invention relates to a method for impact influence on a moving object.
• the invention also relates to a device for impact influence on a moving object.
• the striking tool should in connection with that have a velocity between 3 and 10 m/sec at the striking moment.
• the hydraulically activated striking machine is a further development of striking machines of prior art, which have been pneumatically activated or spring activated. By using hydraulics to control the striking machine, it has been possible to increase the striking velocity from 200-400 strokes per minute to about "3000 strokes per minute. Striking machines of this kind is with advantage used for cutting long objects, such as bars and wire, to a plurality of shorter units. Thereby the object is fed forward a given distance between every activation of the striking tool of the striking ma- chine. Of course such an intermittent forward feeding requires a sophisticated and advanced forward feeding device with such performance that it can match the high striking velocity that the striking machine can work with. The forward feeding arrangement therefore easily becomes relatively expensive and compli- cated.
• An object with the present invention is to enable to perform impact influence with precision on a moving object without momentarily needing to stop its motion. In the case with cutting of the object, this means that cutting surfaces as free of defects as possible of the object are aimed at.
• the method should also be able to be implemented without unnecessarily complicated and expensive constructions or measures being required.
• This object is achieved by means of a method of the initially defined kind, being characterized in that an impact tool is moved essentially in parallel with the object in the moving direction of the object at the same time as it is caused to perform an impact motion across said moving direction in order to transfer an impact to the object and thereby generate said impact influence. Thanks to the moving of the impact tool in the moving direction of the object, the velocity, with which the object passes the im- pact tool at the impact moment is reduced to such a degree that a correct and precise impact influence is achieved. The object can consequently be moved with high velocity without any unfavourably large sliding between the impact tool and the object occurring at the impact moment. In the case with cutting of the object by said impact influence, the emergence of cutting— surfaces with defects generated because of mutual displacement of the impact tool and the object at the impact moment can be reduced or completely eliminated.
• the impact tool has essentially the same velocity as the object in its moving direction at the impact moment. Thereby very high velocities of the object can be achieved with maintained precision of the impact tool, i.e. almost no mutual sliding between the impact tool and the object at the contact surfaces thereof at the impact moment.
• the impact motion of the impact tool is generated by a strike against it by means of a striking tool, which is kept essentially stationary in the moving direction of the object. Because of this characteristic, in particular a more simple and less complicated construction of a striking machine comprising an impact tool movable in the moving direction of the object can be obtained. If also the striking tool should be provided movable together with the impact tool, or replace the impact tool, the unit being formed thereof will have a substantially larger weight than what would otherwise be the case.
• the impact tool is accelerated before the impact moment from a starting position in the moving direction of the object to the velocity of the impact tool at the impact moment, after which it is slowed down and returned to the starting position.
• the impact tool is in this way caused to perform a reciprocating motion in parallel with the moving -direction of the object. In this manner a continuous feeding of the object can be allowed, while a periodical application of an impact influence is performed.
• the ability to accelerate and retard the impact tool in parallel with the moving direction of the object thus becomes crucial for the forward feeding velocity of the object or the distance between the sections of the object being subjected to said impact influence.
• the method allows a very exact control of the application of impact influence with reference to the forward feeding velocity of the object and the distance between the sections of it to be sub- jected to impact influence.
• a flow of a pressurized medium is controlled for influencing the motions of the impa ⁇ t tool in parallel with the moving direction of the object.
• the impact tool is connected to a movable part, comprising a first surface and a second surface with different areas
• the pressurized medium generating a force on the movable part in the acceleration direction of the impact tool when it operates against the first surface and generating a force in the opposite direction when it operates against the second surface
• the flow of the pressurized medium is directed to at least one of said surfaces.
• a relatively uncomplicated and reliable striking machine performing the method according to the invention can be constructed and manufactured.
• the medium is preferably a fluid, for instance an oil.
• the impact has such an impulse that a cutting of the object across its moving direction is achieved without the impact tool passing through the object.
• This requires transfer of a proportionally large kinetic energy to the object via the impact tool.
• the impact against the object is required to be performed with high precision. Any substantial mutual sliding between the impact tool and the object at the impact moment can therefore not be accepted.
• the method according to the invention is thus particularly advantageous in this type of impact influence.
• a further object of the invention is to provide a device enabling to perform impact influence with precision on a moving object without needing to momentarily stop the moving thereof.
• said impact influence results in a cutting of the object, one desires to obtain cutting surfaces as free of defects as possible.
• the device should furthermore be uncomplicated, simple to produce and control and be reliable.
• a device of the kind defined initially being characterized in that it comprises means for moving an impact tool essentially in parallel with the object in the moving direction of the object, and means for at the same time causing the impact tooT to perform an impact motion across said moving direction in order to transfer an impact to the object and thereby generate said impact influence. Thanks to the impact tool being moved in parallel with the object when transferring the impact to this, a mutual sliding between the surfaces of the impact tool and the object being in contact with each other during the impact moment can be reduced or completely eliminated.
• a continuous moving of the object with high velocity while it is being subjected to said impact influence could consequently be achieved at the same time as said impact influence is performed with high precision and with a minimum of possible slid- ing between contact surfaces of the impact tool and the object at the impact moment.
• the means for moving the impact tool in the moving direction of the object are arranged to move the impact tool with essentially the same velocity as the object at the impact moment.
• said impact influence comprises a cutting of the object and the cutting is done by that a powerful impact is directed against the object without the impact tool passing through the object, a more even and finer cutting surface is obtained than if a mutual sliding between the impact tool and the object at the impact moment had occurred.
• the means for bringing the impact tool to perform an impact motion across the moving direction of the object comprise a striking tool, being essentially stationary in the moving direction of the object.
• the device should comprise a sensor which based on the position of the impact tool gives an activation signal to the striking tool. Thanks to the striking tool being stationary, a substantially reduced weight of a movable unit that the impact tool is being part of can be obtained. Thereby faster velocity changes and higher velocities can be achieved of the impact tool at the same time as smaller forces are required for said moving of the impact tool and the unit that this is being part of.
• the device comprises means to before the starting moment, from a starting position, accelerate the impact tool to the velocity it has in the moving direction of the object at the impact moment, and to after the impact moment slow down and return it to the starting posi- tion.
• a reciprocating motion which can be synchronrzed to the velocity of the object and the distance between the sections of the object, where impact influence shall be performed, is achieved.
• the impact is performed when the impact tool has its highest velocity in the moving direction of the object, when this velocity is essentially as high as the velocity of the object at this moment.
• the means for moving the impact tool in parallel with the object in the moving direction of the latter comprise a valve device arranged to control a flow of a pressurized medium for influence of the motions of the impact tool in the moving direction of the object.
• Said means comprise a movable part, connected with the impact tool, and a -stationary part, the movable part defining a first surface and a second surface with different areas, and the pressurized medium, when operating against the first surface, generating a force on the movable part in the acceleration direction of the impact tool, and, when operating against the second surface, generating a force on the movable part in a direction opposite said acceleration direction, and the valve device being arranged to direct the flow of the pressurized medium to at least one of said first and second surfaces.
• the valve device can easily be caused to control the flow with reference to the position of the object relative to the impact tool.
• a control of the flow generating an acceleration of the impact tool in the moving direction of the object can be initiated as soon as a certain length of the object has passed by the impact tool or any part connected thereto.
• the slowing down and returning can be initiated essentially at the moment when a striking impulse is sent to the striking tool. Thanks to this technique, a very exact distance between the sections being subjected to impact influence can be achieved even when the moving velocity of the object is relatively high.
• the medium is preferably a fluid. Thereby especially fast and precise reciprocating motions of the impact tool in parallel with the moving direction of the object can be achieved.
• the impact from the impact tool against the object has such an impact that a cutting of the object across its moving direction is achieved without the impact tool passing through the object.
• the device com- prises in that connection with advantage a damping arrangement, damping the motion of the impact tool across the moving direction of the object and counteracting an impact motion of the impact tool right through the object.
• a damping arrangement damping the motion of the impact tool across the moving direction of the object and counteracting an impact motion of the impact tool right through the object.
• FIG. 1 is a schematic cross-sectional view from the side showing an embodiment of the device according to the invention in a first position
• Fig 2 is a view corresponding to that of Fig 1 , but with the device in a second position.
• the device comprises an impact tool 1 , means 2, 3, 4 for moving the impact tool 1 essentially linearly forth and back, in parallel with a direction x shown with an arrow in the Figures.
• the moving means 2, 3, 4 comprise a stationary part 3, being fixedly connected with a frame 5, only roughly indicated.
• the moving means 2, 3, 4 furthermore comprise a movable part 4, being connected with the impact tool 1 .
• the movable part 4 defines a casing with an inner space 6.
• the stationary part 3 defines a piston extending into the movable part 4 and relative to which the movable part 4 can be displaced forth and back in the direction x.
• the stationary part 3 comprises a section 7 having an outer dimension essentially corresponding to the inner dimension of the space 6 and which -essentially sealingly abuts against this.
• This section 7 separates the space 6 into two separate chambers 8, 9.
• the opposite end walls of the chambers 8, 9 are penetrated by the stationary part, i.e. the piston 3.
• the end wall of the first chamber 8 thereby defines a ring shaped first surface 10, while the end wall of the chamber 9 defines a ring shaped second surface 1 1 .
• the first surface 10 and the second surface 1 1 have different areas.
• the area of the first surface 10 is smaller than the area of the second surface 1 1 .
• the moving means 2, 3, 4 further comprise a valve device 2, which is connected to the movable part, i.e. the casing 4. From the valve device 2 a channel 12 leads to one of the chambers 8, 9, in this case the second chamber 9. Via the channel 12 and the valve device 2, the second chamber 9 can be connected to a source 13 for supply of a pressurized medium.
• This medium is here a fluid, preferably oil with a pressure in the order of 160 bar.
• the first chamber 8 is constantly connected via a further channel 14 to the source 13.
• the second chamber 9 can, via the cannel 12 and the valve device 2 alternatively be disengaged from the source 1 3 and be connected to a system or a container 15 with lower pressure than of the source 13.
• the system/container 15 consists of a discharge tank without " pressure for pressurized medium which via the channel 12 and the valve device 2 is led from the second chamber 9 to said tank 15.
• an acceleration is achieved, by the influence of the pressurized me- dium on the first surface 10, of the movable part 4 in the direction x, see Fig 1 .
• a displacement is achieved, by the influence of the pressure medium on the second surface 1 1 and because of the area difference between the first and second surface, of the movable part 4 in opposite direction, see Fig 2.
• the valve device 2 consequently the motions of the movable part 4 in parallel with the direction x can be controlled.
• the device is penetrated by an object 16, which is fed continu- ously in the direction x by means of a not shown feeding device.
• the velocity thereof could be in the order of 1 -3 m/sec.
• the object 16 is elongated and is moved continuously in its longitudinal direction. It is preferably made of metal and can be a bar or a wire. In this specific case, the object 16 defines a wire, which is moved continuously with a velocity of 2,5 m/sec and shall be cut into 20 cm long units, which shall be used as welding wires.
• a hole is provided in the direction x in the stationary part 3 and in the movable part 4. The path of the object 16 through the device passes by the impact tool 1.
• the impact tool 1 is arranged to periodically perform an impact motion against the object 16, which is moved continu- ously in the direction x.
• the impact being transferred by the impact tool to the object 16 has such an impulse and comprises transfer of such a large kinetic energy that a cutting of the object across its moving direction x is achieved without the impact tool 1 passing through the object 16.
• the impact being transferred by the impact tool 1 originates from a striking tool 17, which can be a hydraulically or pneumatically activated striking piston and which is essentially stationary arranged in the direction x and separated from the movable part 4.
• the impact tool 1 comprises a striking ca " p— 8, against which the striking tool 17 hits.
• a sensor device 19 is arranged to transmit an impulse for activation of the striking tool 17 based on the position in the direction x of the movable part 4, and thereby of the impact tool 1 .
• the device also comprises a schematically shown damping arrangement 20, damping the motion of the impact tool 1 across the moving direction x of the object 16, counteracting an impact motion of the impact tool 1 right through the object 16 and sub- sequently immediately returning the impact tool 1 to its initial position.
• the damping arrangement 20 is stationary and does not follow the movable part 4 and the impact tool 1 in their motions in parallel with the moving direction x of the object 16. Thereby the weight is kept as low as possible of the movable unit.
• the device further comprises a supporting device 21 , in the impact moment supporting the object 16 in an area of this adjacent the section which is hit by the impact tool 1 .
• the supporting device 21 is connected with the movable part 4 and is arranged to be moved in the same direction and with essentially the same velocity as the object 16 at the impact moment.
• the means 2, 3, 4 for moving the impact tool 1 in parallel with the object 16 in the moving direction x of the object have the purpose of before the impact moment, from a starting position, accelerating the impact tool * 1 to the velocity it has in the moving direction x of the object 16 at the impact moment, and after the impact moment to slow down and return the impact tool 1 to the starting position.
• the impact tool 1 is in this connection moved together with the movable part 4 forth and back in parallel with the direction x.
• the valve device 2 via which the motions of the movable part 4 are controlled, is connected to a device 22 for sensing the position of the object 16.
• the sensing device 22 senses when the end of the object 16 which has passed the impact tool has reached a certain distance from the impact tool 1 .
• the se ' nslng device 22 is in this connection arranged to activate the valve device 2 to take a first position, in which it connects the second chamber 9 to the tank 15 and in which an acceleration of the movable part 4, including the impact tool 1 in the moving direc- tion x of the object 16 is achieved.
• the valve device 2 is allowed or activated to be displaced from the first position to a second position, in which it controls the flow of the pressurized medium so that a slowing down and returning of the movable part 4 and the impact tool 1 is achieved.
• the activation of the valve device 2 could be associated either to the impulse of the sensor device 19 to the striking tool 17 or be associated to the sensing of the device " 22 of a further displacement of the object 16 in its mov- ing direction x relative to the impact tool 1 .
• the sensing device 22 is formed of an arm or a rocker, which via a wire or similar is connected to the valve device 2.
• the automatic returning of the valve device 2 is here achieved by that a force seeking to put the valve device 2 to the second position is constantly applied to the valve device 2.
• the valve device 2 comprises a chamber 24, which is constantly connected to the source 1 3 and exhibits a surface 25, against which the pressurized medium can operate to displace the valve device 2 to the second position.
• the device according to the invention it is possible to achieve very fast reciprocating motions of the impact tool 1 and the movable part 4 in parallel with the moving direction x of the object 16.
• the maximum velocity of the impact tool in the direc- tion x can easily be controlled so that it is the highest, and essentially as high as the velocity of the object 16, at the impact moment.
• very even and fine cutting surfaces can be obtained at the same time as the cutting is done with very high velocity and a large number of cut units per time unit can be achieved.
• sensing device 22 and its connection to the valve device 2 for the control of the latter can be varied in a plurality of ways within the scope of the invention.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Percussive Tools And Related Accessories (AREA)
• Multi-Process Working Machines And Systems (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20413315

Family Applications (1)

Country Status (3)

Cited By (1)

Citations (4)

• 1998
  • 1998-11-18 SE SE9803924A patent/SE514893C2/sv not_active IP Right Cessation
• 1999
  • 1999-11-18 WO PCT/SE1999/002112 patent/WO2000032339A1/en active Application Filing
  • 1999-11-18 AU AU19026/00A patent/AU1902600A/en not_active Abandoned

Patent Citations (4)

Also Published As

Similar Documents

Legal Events