JPH033716A - Deburring - Google Patents

Abstract

PURPOSE:To improve productive efficiency and quality by keeping a rotary shaft parallel condition in one of openings to revolute a spherical tool and simultaneously to move them forward and backward in an axial direction, in a deburring method wherein the crossing portion of two openings the inner circumference of which are cylindrical faces is cutted by a spherical tool at the top end of the rotary shaft. CONSTITUTION:A machining center 1 is provided with each servo motor 2, 3, 4 for X shaft, Y shaft and Z shaft, and a main shaft motor 5 which are simultaneously controlled by a NC device 6 respectively. NC data on the basis of operating procedures are input to the NC device 6 via a taperecorder 6b. A work 7 is moved in the direction of the X shaft forwards and backward by the servo motor 2, the main shaft motor 5 is moved in the direction of the Y shaft forward and backward by the servo motor 3, a base 8 is moved in the direction of the Z shaft forward and backward by the servo motor 4. A rotoary shaft 10 is provided to the main shaft motor 5 and a spherical tool 9 furnished with a plurality of edges is fixed to the top end of the rotary shaft. A work 7 is fixed on a table for one of openings to be parallelled to the rotary shaft 10 and the rotary shaft 10 is inserted in the opening 11 to perform chamfering at the portion of crossing lines 13 by the spherical tool 9.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can be suitably employed when performing precision machining of any mechanical parts that have internal intersections between holes for fluid passages. related to deburring methods.

[Prior Art] Conventionally, this type of deburring work for mechanical parts has been carried out manually by skilled technicians using various cutting tools. The finished state after deburring work is as follows:
We try to check using a fiberscope inserted into the hole.

[Problems to be Solved by the Invention] However, when deburring the intersection lines of three-dimensional shapes formed inside parts is performed manually, productivity is low.Secondly, there are many variations in quality. Particularly, when deburring is performed in a state where the intersection lines between holes cannot be visually observed, the incidence of the above-mentioned problems is high, and some kind of improvement is desired. Moreover, since extensive technical experience and advanced technology are essential for such deburring work, it is difficult to secure skilled workers.

In order to solve this problem, for example, the locus of a position eccentric by a certain distance in the normal direction from the microplane of the intersecting line between holes is determined, and then the trajectory of a spherical tool attached to the tip of the rotating shaft is determined. A possible method is to position the center on the trajectory and trace the trajectory with the spherical tool while rotating the spherical tool, thereby cutting the intersection line portion to a constant depth.

However, according to such a method, calculation when determining the trajectory becomes difficult. Moreover, if the center of the spherical tool is always positioned on the trajectory and the trajectory is traced with the spherical tool, there is a high possibility that the rotating shaft and the hole will interfere with each other. Although it is possible to avoid interference between the rotation axis and the hole by changing the inclination of the rotation axis appropriately, such a measure requires a huge amount of data and Therefore, a special device is required to change the inclination of the rotation axis.

The present invention aims to solve the above problems all at once.

[Means for Solving the Problems] In order to achieve the above object, the present invention employs the following configuration.

That is, the deburring method according to the present invention is a deburring method in which a spherical tool attached to the tip of a rotary shaft cuts the intersection line between the holes whose inner periphery is constituted by a cylindrical surface, The rotating shaft is inserted in parallel to one of the holes, and the spherical tool is made to revolve while always maintaining the parallel state between the axis of the hole and the rotating shaft, and the spherical tool is moved back and forth in the direction of the axis. The feature is that the intersection line part is cut.

[Function] According to such a configuration, first, the coordinate values on the line of intersection between two intersecting holes are determined using one of the holes as a reference, and based on that coordinate value, when the spherical tool is revolved, Coordinate values on a concentric circle where the center of the spherical tool should be located are determined.

Next, the coordinate values in the axial direction at which the spherical tool should be moved back and forth are determined from the radius of the spherical tool, the amount of cut at the intersection line, and the distance between the concentric circles and the intersection line. Once the coordinate values of the three axes are determined, the center of the spherical tool is located on the concentric circle, and the spherical tool is rotated and revolved on the concentric circle while keeping the rotation axis and the axis parallel to each other. Furthermore, by moving the spherical tool forward and backward based on the coordinate values in the axial direction, deburring work is performed at the intersection line portion.

[Example] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

The deburring method in this embodiment utilizes an existing machining center 1 as schematically shown in FIG. The machining center 1 includes an X-axis circumferential servo motor 2 and a Y-axis circumferential servo motor 2.
It is equipped with a circumferential servo motor 3, a 1Z-axis servo motor 4, and a main shaft motor 5, and these motors are controlled by an NC device 6.
It is designed to be controlled simultaneously. The X-axis circumferential servo motor 2 is connected to the table via a feed screw 2a, and the workpiece 7 placed on the table is moved forward and backward in the X-axis direction by rotation of the feed screw 2a. . The Y-axis circumferential servo motor 3 is fixed to a base 8, and when the feed screw 3a is rotated, the main shaft motor 5 held by the feed screw 3a moves forward and backward in the Y-axis direction. When the feed screw 4a of the Z-axis circumferential servomotor 4 is rotated, the base 8 moves forward and backward in two axial directions. Further, the main spindle motor 5 is removably mounted with a rotary shaft 10 having a spherical tool 9 fixed to its tip.

The NC device 6 is composed of a microcomputer unit incorporating a memory 6a, an output interface, etc., and is connected to a tape reader 6b via an input interface 6C.

The spherical tool 9 has a plurality of cutting edges on the outer periphery of a spherical shape, and is configured to rotate integrally with the rotating shaft 10.

In the workpiece 7, one small-diameter hole 11 whose inner periphery is constituted by a cylindrical surface and the other large-diameter hole 12 whose inner periphery is constituted by a cylindrical surface intersect inside, and a three-dimensional A line of intersection 13 of the shape is formed. This work 7,
Fix one hole 11 on a table so that it is parallel to the rotating shaft 10, insert the rotating shaft 10 parallel to the hole 11, and chamfer the intersection line 13 using the spherical tool 9 at the tip. I try to do it.

When chamfering the intersection line 13, NC data was created based on the work procedure as schematically shown in Figure 2.
The NC data is sent to the NC via the tape reader 6b, etc.
Equipment 6 is powered manually. First, in step 21, the intersection line 13 between one hole 11 and the other hole 12 is determined with reference to the one hole 11 side parallel to the Z axis, and the process proceeds to step 22.

The intersection line 13 in this case is determined as the coordinate values in the X-axis and Y-axis directions of a circle centered on a point on the axis 11a of one of the holes 11, as shown in FIG. In step 22, the concentric circle 14 in which the center 9a of the spherical tool 9 should be located when the spherical tool 9 revolves while maintaining the parallel state between the rotating shaft 10 and the axis 11a is determined as an XSY coordinate value, and step Proceed to step 23. In step 23, the intersection line]-3
1 and the center 13a of the intersection line 1B, and the intersection points n1 to n with the concentric circle 14 are determined, and the process proceeds to step 24. In step 24, the distance α between the intersection line 13 and the center 9a of the spherical tool 9, the intersection line 1
The angle θ at the contact point between the spherical tool 9 and the intersection line 13 is determined from the depth of cut d of the three portions and the radius r of the spherical tool 9, and the coordinate value of Z is determined based on the angle θ. The angle θ can be determined, for example, by the following equation.

α−(r−d)・cosθ However, r ×α×r (r− is the radius of the rotating shaft 10) In step 25, the concentric circle 1 obtained by the following two steps is
The coordinate values (X, Y, Z) between each fish group n1 to no on 4 are interpolated, and these coordinate values are prepared as coordinate data of the center 9a of the spherical tool 9. In step 26, the data is input to the NC device 6, and while driving the main shaft motor 5, the X-axis circumferential servo motor 2, the Y-axis circumferential servo motor 3, and the Z-axis circumferential servo motor 4 are simultaneously controlled. Execute 13 parts of deburring work. That is, the spherical tool 9
Move forward and backward in the Z-axis direction while drawing a circle relative to the workpiece 7 at a certain distance from the workpiece 7, and while moving three-dimensionally along the shape of the intersection line 13, move the intersection line 13 part to a certain depth. It will be cut to .

Therefore, according to such a configuration, the chamfering work of the intersection line 13 portion of the three-dimensional shape formed in the workpiece 7 can be effectively mechanized, so that the chamfering work is more efficient than the conventional manual deburring work. Not only can production efficiency be greatly increased, but quality can also be reliably stabilized.

Moreover, according to such a measure, the existing machining center 1 etc. can be used effectively without requiring skilled work.

In addition, since the spherical tool 9 is controlled relative to the workpiece 7 while always maintaining the parallel state between the rotating shaft 10 and one hole 11, three-axis control is performed, so that the rotating shaft 10 and the hole 11 can be effectively prevented, and the amount of data needed to operate the machining center 1 etc. is relatively small, making it highly practical.

Note that instead of the machining center, at least x,
A milling machine or the like equipped with an NC device that can perform time control between three axes of ySz may be used.

In addition, the present invention is effective not only when two holes whose inner peripheries are cylindrical are perpendicular to each other, but also when they intersect at various angles, as long as one hole and the rotation axis are always parallel to each other. Applicable to

Further, in the above embodiment, the workpiece is moved, but the spherical tool may be moved in three axial directions while the workpiece is fixed.

[Effects of the Invention] According to the present invention configured as described above, it is possible to easily mechanize the deburring work of the intersection line between the holes formed inside the workpiece, thereby improving the quality of the product. Production efficiency can be greatly increased, and quality can be reliably stabilized.

Moreover, according to the present invention, no special skill is required to carry out the deburring work, and existing equipment can be used effectively, so it is highly practical.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view schematically showing the entire device, FIG. 2 is a flowchart schematically showing the work procedure, and FIGS. 3 and 4 show main parts. It is a figure for explaining. 1... Machining center 7... Work 9... Spherical tool 10... Rotating axis 11. 12... Hole 13... Intersection line

Claims (1)

[Claims] The intersection line between two holes whose inner periphery is composed of a cylindrical surface is
A deburring method in which cutting is performed using a spherical tool attached to the tip of a rotating shaft, the rotating shaft is inserted parallel to one hole, and the axis of the hole is always kept parallel to the rotating shaft. A deburring method characterized in that the spherical tool is caused to revolve, and the spherical tool is advanced and retreated in the axial direction to cut the intersection line portion.