Electric heating – Metal heating – Cutting or disintegrating
Reexamination Certificate
1999-10-15
2001-08-28
Shaw, Clifford C. (Department: 1725)
Electric heating
Metal heating
Cutting or disintegrating
C219S136000
Reexamination Certificate
active
06281462
ABSTRACT:
DETAILED DESCRIPTION OF THE INVENTION
1. Technical Field of the Invention
This invention relates to a burr processing apparatus which is suitable for removing a generated burr and making it flate when an iron plate, a stainless steel plate and an aluminum plate are cut under application of an arc discharge.
2. Related Art
As shown in
FIG. 9
, when an iron or steel material, a stainless steel and an aluminum plate or the like are press cut, many burrs are usually generated at a peripheral edge of the metallic plate. In order to process these burrs, it is known to apply (a) a method for processing them with an automatic burr removing machine in which a processed member is dived in a system having a grinding machine therein to remove burrs; (b) a method for processing them manually with a hand grinding machine; and (c) a buff applying method blowing fine grinding particles against the burr to remove it and the like. However, these means had some problems, i.e. (a) in case of an automatic burr removing machine, not only the burr but also the product portion is damaged and at the same time there is a certain limitation that the processed material must be a flat plate, (b) in case of a grinder, there occurs a problem of producing return-burr and its operation is not efficiently carried out and further (c) the buff applying operation also easily produces scar at the product.
In turn, as a burr removing apparatus performed under utilization of plasma discharging operation, for example, apparatuses disclosed in (a) the gazette of Japanese Patent Laid-Open No.Sho 50-28093, (b) the gazette of Japanese Patent Laid-Open No.Hei 7-40150 and (c) the gazette of Japanese Patent Laid-Open No.Hei 8-132392 are well known in the art.
Their gists consist in (a) an arrangement that there are provided a sealingly closed vacuum processing container, a pump device for evacuating the container, a moving device for passing and moving the processed wires into a processing container discharged by the pump device, and an electrical discharging power supply for applying a discharge voltage between the moving wires so as to remove burrs and scales at the surface of the wires with a plasma striking action caused by the electrical discharge; (b) an arrangement that there are provided a transporting device for the processed material, electrodes arranged at both sides with the transporting device being held between them to perform a plasma discharge machine at a small diameter hole of the material, and a discharge point control means for moving the discharge point between the electrodes and discharging substantially over an entire region of the small diameter hole of the machine material and (c) a method for machining a through-hole punched at the processed base material, wherein after passing through the through-hole, the drill or a router being applied as one electrode, a voltage is applied between the drill or router electrode and the electrode at the processed base material and at the same time, a corona discharge is generated between both electrodes with an air pressure of 10 to 2×10
3
Torr.
In view of the foregoing, if it is assumed that the burr is processed under application of the plasma discharge against the aforesaid iron and steel material, the aforesaid methods (a) to (c) are applied to the iron and steel material and the like, only a partial burr at the small diameter hole near the electrode is processed due to the form in which device itself is fixed and the processed material is moved, resulting in that as for the object material such as the iron and steel material having a long burr to be processed and its shape or size is not specified, it is impossible to perform a uniform processing over the entire material.
SUMMARY OF THE INVENTION
In view of the foregoing, the present inventor noticed to perform an operation in which the apparatus itself, i.e. the discharge electrodes are moved along the peripheral edge of the processed material so as to perform an entire uniform processing of the burr.
However, it has become apparent that if the discharge electrodes are moved as they are, they show some disadvantages that the discharge electrodes are moved in a zig-zag form on a line where the burrs are generated, and a clearance between the burr and the electrode is unstabled, resulting in that the electrodes approach much closer at a certain location and remove excessive amount of burr, and in turn at another certain location, the electrodes are away too much to remove the burrs. It has also become apparent to generate a problem that when the electrodes are moved, an electrical discharge time becomes elongated as the moving distance is extended, resulting in that if acute electrodes are applied, their extremity ends are damaged and so the electrodes must be frequently replaced with new electrodes.
The present invention has been invented in order to solve these problems.
The burr processing apparatus of the present invention is constituted such that an electrical discharge electrode is formed into a cylindrical shape having a sectional shape being narrowed toward its extremity end and having a specified width in a lateral direction, said electrical discharge electrode is kept at such a height as one suitable for an arc-discharge, a case member is arranged to cover said electrode, a handle connected to said case member and manually moved and then a power supply for an arc discharge is connected to said discharge electrode.
It is preferable that the electrical discharge electrodes are of a chisel-shaped discharge electrode having a cylindrical extremity end with a sectional shape narrowed toward an extremity end and with a specified width in a lateral direction, a hold section which is cylindrical or elliptical shape in a longitudinal direction and a raised part at an intermediate section.
When electrical discharge electrodes set at a specified height of the case are oppositely faced against the burr generating locations of the processed materials and the power supply for them is turned on, an arc discharge is released from the discharge electrodes and the acute burrs are melted and removed by inputted heat.
At this time, the handle is held by a hand and the bottom side of the case is moved along the peripheral edge where the burr of the processed material is generated, the arc discharge from the discharge electrodes is carried out continuously toward the burr and since the most suitable point within the width of the cylindrical electrode having a specified width in a lateral direction is selected automatically, the discharge point from the power supply is dispersed within a specified width, resulting in that a stable electrical discharge is attained.
Further, since a moving speed and a moving stage can be changed in response to a size and a form of burr, a wide correspondence against the situation may become possible.
In the case that the electrical discharge electrodes are of a chisel shape, a certain pressure change is generated in a gas flow flowing between the case and the intermediate raised part to cause an annular eddy flow to be induced near the extremity ends of the electrodes, a high shielding effect is generated by the annular eddy flow, heat of the electrodes is absorbed and then a shield effect as well as a cooling effect are increased.
The apparatus of the present invention having the aforesaid configuration and action has some superior effects that it enables a burr having a relative long distance and non-uniform shape generated at iron and steel material, stainless steel and aluminum plate or the like to be processed in an entire uniform manner and at the same time the operation can be carried out in a quite high efficient manner. Further, since the apparatus has a less amount of wear at the electrode, it has a long life as the product and this invention is an advantageous invention having some practical and economical values.
REFERENCES:
patent: 2809277 (1957-10-01), Breymeier
patent: 3231430 (1966-01-01), Krieger et al.
patent: 3937915 (1976-02-01), Matsuo et al.
patent: 4308446
Iiyama Saburo
Kusumoto Kazuomi
Aitken Andrew C.
Howard & Civiletti LLP
Shaw Clifford C.
Venable Baetjer
LandOfFree
Burr processing apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Burr processing apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Burr processing apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2486045