JPH088063Y2 - Belt sander - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a belt polisher obtained by polishing a hard member easily and with high precision, and particularly to a blade of a steam turbine engine and a gas turbine engine. It is suitable for polishing finish.

<Prior Art> Conventionally, in order to maintain a predetermined clearance between a blade top portion of a moving blade that constitutes a steam turbine engine or a gas turbine engine and an arc-shaped turbine casing, a center of the turbine rotor shaft center It had a circular arc shape and was formed into a highly accurate shape and finished.

A wire-cut electric discharge machine, which performs numerically controlled machining, is known as the latest technology as a machining machine that enables such machining. This wire-cut electric discharge machine uses a wire having a diameter of 0.1 mm to 0.3 mm and an object to be processed as electrodes, respectively, and performs spark discharge repeatedly between the wire and the object to perform processing. That is, the surface of the work piece is removed minutely by electric discharge to perform cutting work. While the work piece is immersed in the working liquid, the work piece or wire is numerically controlled according to the information input tape. By moving, a predetermined arcuate locus is drawn on the surface of the workpiece, and the workpiece is machined.

<Problems to be solved by the invention> The wire-cut electric discharge machining described above has a disadvantage that it requires a large number of steps and a long working period because the machining energy is smaller than other machining methods. ing. For example, in the case of a blade used for a 100,000 KW (kilowatt) class gas turbine engine, it takes 120 hours to process one blade, and it is possible to manufacture a gas turbine engine by using multiple wire electric discharge machines. This is the biggest factor that makes it difficult to shorten the construction period.

<Means for Solving the Problems> The belt sanding machine according to the present invention is mounted on a pedestal and has a sliding portion which allows movements in two axes of freedom on the pedestal which are orthogonal to each other in the same plane. Table that is attached to the base and can be fixed at an arbitrary inclination angle to the gantry, a chuck unit that is placed on the table and holds the workpiece, and is attached to the gantry facing the workpiece. A polishing belt wound around a contact wheel to polish the work piece, a copying gauge attached to the mount and having a shape corresponding to the finish shape of the work piece, the work piece attached to the table and the work piece And an operation handle for pressing the object against the contact wheel and moving the table in accordance with the shape of the copying gauge. is there.

<Operation> After the table is tilted with respect to the gantry and set at an arbitrary angle, the table movably supported by the sliding portion is moved in accordance with the movement of the operation handle while following the scanning gauge. As a result, the workpiece to be attached to the table via the chuck unit is pressed against the contact wheel, and is polished by the polishing belt into an arbitrary shape.

<Embodiment> An embodiment of the belt sanding machine of the present invention is shown in FIGS. 1 to 3, and this embodiment will be described with reference to these drawings.

In this embodiment, the moving blades of the gas turbine engine are used as the workpiece, and the operation of processing the blade tops of the moving blades is shown in FIG.

As shown in FIG. 1, a support base 51, which is a base of the belt sanding machine 1, has a linear guide rail 10 using a linear bearing so that a movable base 52 can be moved in the X-axis direction in FIG. The work table 53 is supported on the movable table 52 via the linear guide rail 11 so as to be movable in the Z-axis direction in the direction intersecting the X-axis in FIG. ing. Therefore, the linear guide rails 10, 11 and the like form a sliding portion. Work table 5
In FIG. 3, there is a table 7 which is tilted so as to change the angle α around the hinge 9 located on the front end side which is closer to the right side in FIG. 1 and which is integrally formed with the operating handle 8 along the circumference. The chuck unit 6 is supported on the table 7 via a slide portion 60 for slidingly moving on the table 7. The chuck unit 6 supports the base end side B of the moving blade 5, and
The operating handle 8 is gripped by an operator (not shown) so as to manually move the table 7.

On the other hand, a screw shaft 18 is attached to the rear end side of the movable table 52, and a handle 19 which is connected to the screw shaft 18 and rotates the screw shaft 18 is attached to the movable table 52. Screw shaft 18
A connection member 20 that is screwed onto the screw shaft 18 and that moves along the screw shaft 18 by the rotation of the handle 19 is attached to this. One end of a lever 21 is rotatably connected to the connecting member 20, and the other end of the lever 21 is rotatably connected to the table 7.

Further, the support lever 22 is rotatably connected to the work table 53, and a long hole 22a is formed at the tip end side of the support lever 22. The support lever 22 and the table 7 are fastened and connected by a set bolt 23 that penetrates the elongated hole 22a and is screwed into the table 7.

On the other hand, on the work table 53, a copying roller unit 12 that supports an idler roller (not shown) is attached to the front end, and the front end side of the copying roller unit 12 is a fixture fixed to a support base 51. It is attached so as to face the scanning gauge 13 supported by 54. still,
The copying gauge 13 is a plate gauge having an end formed with an arc for machining the moving blade 5 into a curved shape, and the roller of the copying roller unit 12 can come into contact with this end.

Similarly, the polishing belt drive mechanism 57 attached to the support base 51 has a pulley 56 that is driven and rotated by the electric motor 2 via the belt 55, and the polishing belt 3 is wound around the pulley 56. The contact wheel 4 is rotatably attached at a position of the polishing belt drive mechanism 57 facing the tip side A of the moving blade 5, and one end of the polishing belt 3 is wound around the contact wheel 41.

A granite comparator stand 15, which is a surface plate, is attached to the support base 51. The stand 15 has three dial gauges corresponding to movements of the moving blades in the X-axis and Z-axis directions or fluctuations in the angle α. Is attached and 3
One of the two dial gauges 14 is shown. Therefore, the granite comparator stand 15 and the dial gauge 14 constitute the measuring unit 16.

Further, stopper brackets 17 for limiting the movement of the moving table 52 in the X-axis direction to a certain range are provided at both ends of the supporting table 51.
Are attached, and stopper brackets (not shown) for limiting the movement of the work table 53 in the Z-axis direction to a certain range are attached to both ends of the movable table 52.

The polishing processing of the moving blade 5 by the belt polishing belt machine 1 described above will be described below.

First, with the set bolt 23 loose,
The screw shaft 18 is rotated by turning, and the rear end side of the table 7 is connected to the work table via the connecting member 20 and the lever 21.
Push up against 53. Along with this, the set bolt 23 relatively moves within the elongated hole 22a of the support lever 22, and as a result, the inclination angle α of the table 7 is arbitrarily set. Furthermore, after setting the angle α, screw the set bolt 23,
Make sure that the angle α does not change during processing.

After that, the operating handle 8 is repeatedly reciprocated in the X-axis direction by hand, whereby the moving blade 5 reciprocates accordingly. Therefore, the contact wheel 4 around which the polishing belt 3 driven and rotated by the electric motor 2 is wound around the moving blade 5
Are brought into contact with each other, and the surface of the moving blade 5 is polished. This time,
While the copying roller unit 12 moved by the linear guide rail 11 is brought into contact with the copying gauge 13 by input, the moving table 52 reciprocates in the X-axis direction by the sliding of the linear guide rail 10, so that the shape of the copying gauge 13 is changed. The rotor blade 5 is polished into an arbitrary shape along the line.

That is, as shown in FIG. 2, by rotating the table 7 by the inclination angle α, the blade top portion of the moving blade 5 is inclined and polished, and as shown in FIG. 3, it matches the arc of the scanning gauge 13. And is polished so as to form a predetermined radius of curvature R required for the blade tip of the moving blade 5. As a result, the surface of the moving blade 5 can be formed on the required three-dimensional curved surface.

The polishing processing amount is sequentially displayed by the measuring unit 16, and the amount can be known, and an appropriate processing amount can be grasped.

Further, in the present embodiment, the processing target portion is the blade top portion of the moving blade 5, but the side surface portion of the moving blade 5 may be subjected to polishing processing, and a material other than the moving blade 5 may be a workpiece. Good.

<Effect of the Invention> According to the belt sanding machine of the present invention, it is difficult to perform a process capable of forming a three-dimensional surface shape in a short time and with high accuracy, even if the member has a very hard surface. , Can be processed.

For example, if the arc-shaped blade top of a gas turbine engine blade made of cobalt-based cemented carbide is precision-finished by wire-cut electrical discharge machining that has been conventionally used, it will take 120 hours. According to the method, machining was possible in 8 hours, and the machining accuracy was equal to or higher than the machining accuracy by wire-cut electric discharge machining.

Therefore, it has become possible to shorten the construction period for manufacturing the gas turbine engine, and to meet the demand for a shorter delivery period.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a belt sanding machine of the present invention, FIG. 2 is a side view of a blade top portion of a blade machined by the belt sanding machine of FIG. 1, and FIG. 3 is shown in FIG. FIG. 6 is a front view of the top of the moving blade shown. In the drawings, 1 is a belt grinder, 3 is a grinding belt, 4 is a contact wheel, 5 is a moving blade, 6 is a chuck unit, 7 is a table, 8 is an operating handle, 10 and 11 are linear guide rails, 1
3 is a scanning gauge, 16 is a measuring unit, 51 is a support base, 52 is a moving base, and 53 is a work table.

Claims (1)

[Scope of utility model registration request] 1. A sliding part attached to a pedestal and capable of operating on the pedestal in two axial degrees of freedom orthogonal to each other in the same plane, and an arbitrary part with respect to the pedestal attached to the sliding part. A table that can be fixed at an inclination angle of, and a chuck unit that is mounted on the table and holds a workpiece.
A polishing belt that is wound around a contact wheel that is attached to the pedestal so as to face the workpiece and that polishes the workpiece, and a shape that is attached to the platform and that corresponds to the finished shape of the workpiece. A belt sanding machine comprising: a gauge; and an operating handle that is attached to the table and presses the workpiece against the contact wheel and moves the table according to the shape of the copying gauge.