JPS5938986Y2 - Table or spindle for finishing machining - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a spindle device suitable for electric discharge machining, electrolytic machining, and close machining (enlarging machining) using the fine method.

In general, edge machining by electrical discharge machining, etc., involves sequentially or alternately moving the rough-machined electrode and workpiece in the desired direction by small distances within the X-Y plane perpendicular to the axial direction of the main shaft. Electric discharge machining is performed to create a predetermined clearance between the punch and the die, such as when performing finishing machining while performing finishing machining, or when performing finishing electrical discharge machining on a part that has been machined in advance, or when using a cut-out part machined by wire cant electrical discharge machining as a punch, etc. Furthermore, when machining fluid cannot be jetted into the machining gap between the electrode and the workpiece during electrical discharge machining, machining can be performed while moving the electrode in sequence to eliminate machining debris. It is necessary in cases where there is a lot of work, such as enabling highly stable machining.

However, when performing this approach machining, applying a moving feed in the desired direction in small distance increments immediately affects the accuracy of the square pressure, so highly accurate feed control is required, and conventionally, this drive control However, the structure of the table or the main shaft and the driving device are extremely complicated and expensive.

The present invention has been proposed to eliminate this drawback.

The following will be explained with reference to an embodiment of the drawings. Fig. 1 shows a side sectional view of the main part of the present invention, and 1 is a main shaft provided in a processing head (not shown) so as to be able to control feed in the axial direction. An outer frame member 4 is fixedly provided on the tip side of the main shaft 1 so as to cross the shaft, and an electrode is attached to the tip of the main shaft 1. ,
A workpiece attachment holder 3 is connected via a tilting universal joint 2 having a spherical body, and a surface of the holder 3 on the outer frame member 4 side is connected.

An inclined surface 3a is formed with the joint connecting portion as the center, and a plurality of abutting elements 5 consisting of the inclined surface 3aKi/'i roller collars and the abutting elements 5 are moved back and forth to form the inclined surface 3.
The forward and backward movement axes of the drive devices 6 corresponding to the respective abutting elements 5 that press the abutments 5 are arranged at equally spaced positions on a concentric circle centered on the main axis of the outer frame member 4.

A driving device 6 for a forward/backward shaft that moves the contact element 5 forward and backward or up and down, etc. For example, a pulse motor, a servo motor,
It is constructed using a cylinder with a control device, etc., and its operation, advancement/retraction length, etc. are controlled by, for example, an NC control device (not shown).

In addition, as shown in the top view of the holder in FIG.
Centering on the main shaft 1, the inclined surface 3a of the holder 3 is divided into four equal intervals at concentric circles (of course, it may be divided into three equal parts)
The holder 3 is provided symmetrically at the position shown in FIG.

That is, among the abutting elements 5 brought into pressurized contact with the inclined surface 3a by the advance/retreat shaft of the drive device 6, those at symmetrical positions with respect to the main shaft 1 are grouped, and one is advanced (lowered) in the opposite direction. At the same time, when the other roller is moved backward (raised), each roller rotates downward and upward while pressing against the inclined surface 3a. It tilts in the direction of the line connecting the sets of rollers that are moved forward and backward.

In this case, the rollers of the other set, which are located symmetrically with respect to the axis of the main shaft 1 in a direction that intersects the line connecting the rollers of the set, may become an obstacle to the tilting movement or come into pressure contact. When the state is released, the rollers of the other set are operated to move backward or forward at the same time by the advance/retreat shafts of the respective drive devices according to a preprogrammed program or a contact state detection/discrimination hemorrhoid.

Therefore, it is possible to change the set value of the forward/backward movement length of the forward/backward axis of each drive device provided for the forward/backward movement of multiple rollers or to switch the forward/backward movement method, or to switch or change the forward/backward control operation between each set of rollers. The holder 3 can be tilted in any direction, for example, by sequentially tilting the processing table surface in the X-axis and Y-axis directions facing the holder 3, which is perpendicular to the axis (Z-axis) of the main spindle 1, the holder 3 can be tilted in any direction. By making the electrodes attached to 3 perform movements such as swinging and scraping, it is possible to perform the desired finishing process.

Incidentally, the dimensional distance of the shifting feed is determined by the forward and backward stroke of the contact element 5 and the length between the tip outer circumference of the electrode etc. attached to the holder 3 and the center of tilting, and
It can be adjusted arbitrarily depending on the driving distance of each advance/retreat axis, etc.
Since the locus of the outer circumferential point of the tip of the electrode etc. due to the change in the tilting angle becomes a circular arc with the center of the tilting as the center point, the dimensional distance of the shifting feed is as follows even in the present invention:
This is done within a very small range of about 4 barrels or less at most.

FIG. 3 shows that the inclined surface 3b formed on the holder 3 is
In the case of Fig. 2, the roller is formed in an annular shape near the center of the holder 3; It is a side sectional view of an example of a modified configuration in which the advancing/retracting axis of the drive device 6 is disposed in the outer frame member 4 so as to advance and retreat in the radial direction of the holder 3 perpendicular to the axis and to contact and suppress the inclined surface 3b. The structure, operation, etc. are substantially superior to those of the embodiment shown in FIG.
A historical explanation will be omitted.

As described above, the configuration of the device of the present invention is such that a holder such as an electrode is tiltably provided at the tip of the main shaft of an electrical discharge machine, etc., an inclined surface is formed on the holder, and a contact element is brought into contact with this inclined surface. Since the holder is tilted by the abutting element pressing the inclined surface by the forward and backward movement of the abutting element,
The configuration is easy.

Moreover, its tilting can be easily controlled.

It has a main shaft structure that performs processing such as shifting, and can be provided easily and inexpensively, and is highly effective in practical terms.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing the structure of one embodiment of the present invention, FIG. 2 is a top view of its main parts, and FIG. 3 is a side sectional view showing the structure of another embodiment. 1...Main shaft, 2...Tilt universal joint, 3
...Holder, 3a and 3b...Slope, 4...Outer frame member. 5... Contact element, 6... Drive device.

Claims (1)

[Claims for Utility Model Registration] An outer frame member is fixedly provided on the tip side of a main shaft provided in a processing head so as to be able to control feed in the axial direction. Connecting an electrode or workpiece mounting holder to the tip of the main shaft via a tilting universal joint, and forming an inclined surface centered on the connecting portion on the surface of the holder on the outer frame member side, Furthermore, a plurality of abutting elements relative to the inclined surface and a forward and backward axis of a drive device that advances and retreats each of the abutting elements to press the inclined surface are arranged at equal intervals on a concentric circle centered on the main axis of the outer frame member. Spindle for edge machining, which is located at the position of .