JPH0117830B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides a table and a table that calculate and set the amount of relative movement between a table and a tool in a machine tool such as a horizontal axis rotary surface grinder. The present invention relates to a tool relative movement control device.

Conventional configuration and its problems In a small horizontal axis rotary surface grinding machine,
Attach a workpiece attachment jig to the table, attach the workpiece to the workpiece support surface of this attachment jig,
I support it. Then, a tool such as a grindstone is placed facing the workpiece support surface of the pasting jig, the table and tool are moved relative to each other, and the workpiece is ground with the tip of the tool. , as is well known. The amount of grinding of the workpiece is determined by the amount of relative movement of the table and tool. In this horizontal axis rotary surface grinder, when setting the amount of relative movement between the table and the tool, conventionally the relative position of the table and tool before movement was used as a reference position. Then, the table and the tool are relatively moved from the reference position by an amount of movement corresponding to the finished dimensions of the workpiece, thereby machining the workpiece. However, when a tool such as a grindstone wears, the amount of grinding of the workpiece decreases by the amount of wear, which affects the machining accuracy of the workpiece. The same applies to the attachment state of the workpiece pasting jig to the table, which also affects the machining accuracy of the workpiece. For this reason, this type of surface grinder has a problem of poor machining accuracy of the workpiece.

Purpose of the Invention Therefore, the present invention provides a machine tool such as a horizontal axis rotary surface grinder, in which the wear of tools such as grindstones and the mounting condition of the workpiece attachment jig do not affect the machining accuracy of the workpiece. This was done for the purpose of increasing the machining accuracy of the workpiece.

Composition of the Invention The present invention provides, prior to processing a workpiece,
A relative position detector having a detection part and a reference surface at both ends is inserted between the workpiece support surface of the table and the tip of the tool, and the reference surface of the detector is inserted between the workpiece support surface and the tip of the tool. contact. Thereafter, the table and the tool are moved relative to each other until the other of the workpiece support surface of the table and the tip of the tool comes into contact with the detection section of the detector. The relative position of the table and tool when the detector operates is stored as a reference position, and when machining the workpiece, the amount of relative movement of the table and tool from this reference position is determined as the detector's reference position. The calculation is performed based on the distance between the surface and the detection section and the finished dimensions of the workpiece.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the figure, a workpiece 1 is supported on a workpiece support surface 3 of a table 2 . In this embodiment, a workpiece pasting jig 4 is attached to a spindle of a table 2 by a chuck 5, and a number of workpieces 1
is pasted and supported on the workpiece support surface 3 of the pasting jig 4. The table 2 is movably supported by a support frame 6 and connected to a ball screw 7. The ball screw 7 is for moving the table 2 relative to the support frame 6.

The tool 8 is for grinding the flat surface of the workpiece 1, is a cup-shaped grindstone, and is fixed to the spindle of the housing 9.

As shown in FIGS. 3 and 4, the relative position detector 10 has a reference surface 11 and a detection section 12 at both ends. The detection unit 12 is connected to detection means (not shown) that detects minute displacements thereof. Detector 10
auto switch cylinder 1 by arm 13
4, and the auto switch cylinder 14 is connected to a motor 15 supported by the housing 9.

To process the workpiece 1 with this horizontal axis rotary surface grinder, the tool 8 is rotated at high speed by its spindle, and at the same time, the ball screw 7 is driven to move the table 2 toward the tool 8. That's fine. The workpiece 1 contacts the tip of the tool 8,
The tip of this tool 8 is used to grind and process.

The means for moving the table 2 is the linear encoder 1.
Measured by 6. In addition, as described later,
The amount of movement of the table 2 is calculated and set in advance by a calculation circuit (not shown).

In the apparatus configured as described above, when the motor 15 is driven prior to machining the workpiece 1, the arm 13 swings, and the detector 10 detects the workpiece support surface 3 of the table 2 and the tool 8. inserted between the tips of the Therefore, in this embodiment, the motor 15 is used as an insertion means for inserting the relative position detector 10 between the workpiece support surface 3 and the tip of the tool 8. Next, when the auto switch cylinder 14 is driven, the reference plane 11 of the detector 10
moves toward the tool 8 and contacts the tip of the tool 8.

Thereafter, when the ball screw 7 is driven, the table 2 is moved toward the tool 8 by the screw feeding action, and the workpiece support surface 3 is displaced toward the detector 10. As shown in FIG. 3, the table 2 is moved until its workpiece support surface 3 contacts the sensing portion 12 of the detector 10. As shown in FIG. When the workpiece support surface 3 of the table 2 comes into contact with the detection part 12 of the detector 10, the detector 10 is activated and the ball screw 7 and table 2 are automatically stopped. Therefore, in this embodiment, the ball screw 7 is used as a moving means for moving the table 2 and the tool 8 relative to each other. Linear encoder 16
measures the moving position of the table 2, and stores the moving position of the table 2 when the detector 10 operates as the origin. Therefore, in this embodiment, the linear encoder 16 is used as a storage means for storing the relative position between the table 2 and the tool 8 when the detector 10 operates as a reference position.

When the ball screw 7 is reversed, the table 2 is separated from the housing 9, and the detector 10 is moved away from the pasting jig 4.
is released from the workpiece support 3. Auto switch cylinder 14 and motor 15 return detector 10 to its original position.

To set the amount of grinding of the workpiece 1, that is, the amount of movement of the table 2, the distance L between the reference surface 11 of the detector 10 and the detection section 12 and the finished dimension S of the workpiece 1 are input to the calculation circuit. Just enter it.
The arithmetic circuit calculates the difference (L-S) between the distance L and the finished dimension S of the workpiece 1. By this,
When processing the workpiece 1, the linear encoder 16
The amount of movement of the table 2 toward the tool 8 from the origin can be calculated. Therefore, in this embodiment, the amount of relative movement between the table 2 and the tool 8 is calculated based on the distance between the reference surface 11 of the detector 10 and the detection section 12 and the finished dimensions of the workpiece 1. An arithmetic circuit is used as the arithmetic means.

When processing the workpiece 1, when the ball screw 7 is driven, the table 2 moves toward the tool 8, passes the origin of the linear encoder 16, and further moves from this origin as calculated by the arithmetic circuit. amount toward the tool 8. table 2
moves further from the origin of the linear encoder 16 by the amount of movement calculated by the calculation circuit, that is, the difference (L-S) between the distance L and the finished dimension S of the workpiece 1, the ball screw 7 and the table 2 automatically move. stop. Therefore, the workpiece support surface 3 of the table 2 is displaced to a position separated from the tip of the tool 8 by an interval corresponding to the finished dimension S of the workpiece 1, and stops at this position. The workpiece 1 is ground and machined to a finished dimension S by the tip of the tool 8.

As is well known, the tool 8, ie, the grindstone, wears out over time. It is also difficult to keep the mounting state of the workpiece pasting jig 4 on the table 2 constant. However, this device
The reference surface 11 of the detector 10 contacts the tip of the tool 8, and the workpiece support surface 3 of the pasting jig 3 contacts the detector 1.
Since the movement position of the table 2 when the table 2 comes into contact with the detection part 12 of 0 and the detector 10 operates is stored as the origin of the linear encoder 16, the wear of the tool 8 and the attachment state of the pasting jig 4 are determined by the workpiece. It does not affect the machining accuracy of 1. Therefore, regardless of the wear of the tool 8 and the installation state of the pasting jig 4,
The workpiece 1 can be accurately machined to the finished dimension S, and the processing accuracy of the workpiece 1 can be improved.

Note that the present invention can also be applied to a type of machine tool that moves the tool 8 toward the workpiece 1 instead of the table 2. in this case,
On the contrary, the reference surface 11 of the detector 10 is brought into contact with the workpiece support surface 3 of the table 2, and the tip of the tool 8 is brought into contact with the detection part 12 of the detector 10. Then, the movement position of the tool 8 when the detector 10 operates may be stored as the origin of the linear encoder 16, that is, the reference position. In short, it is sufficient to store the relative position between the table 2 and the tool 8 when the detector 10 operates as the reference position. Then, when processing the workpiece 1, the distance L between the reference surface 11 of the detector 10 and the detection unit 12 and the distance L between the reference surface 11 of the detector 10 and the detection unit 12 and the distance L of the table 2 and the tool 8 relative to the reference position are determined. If the calculation is based on the finished dimension S, the processing accuracy of the workpiece 1 can be improved and similar effects can be obtained.

Effects of the Invention As explained above, when processing a workpiece with a machine tool, the present invention is not affected by the wear of tools such as grindstones or the mounting state of the workpiece attachment jig, and the workpiece is machined by a machine tool. It is possible to improve the processing accuracy of objects and achieve the intended purpose.

[Brief explanation of drawings]

1 is a perspective view showing an embodiment of the present invention, FIG. 2 is an explanatory view showing the operation of the arm with respect to the tool and workpiece support surface of FIG. 1, and FIG. 3 is a perspective view showing the tool and workpiece of FIG. FIG. 4 is a side view showing the positional relationship between the workpiece support surface and the detector; FIG. 4 is a side view showing the detector of FIG. 1; DESCRIPTION OF SYMBOLS 1... Workpiece, 2... Table, 3... Workpiece support surface, 8... Tool, 10... Detector, 11
... Reference plane, 12 ... Detection section, 13 ... Arm,
14...Auto switch cylinder, 15...Motor, 16...Linear encoder.

Claims (1)

[Claims] 1. Support a workpiece on the workpiece support surface of a table, arrange a tool to face the workpiece support surface, move the table and tool relatively, and move the workpiece to the tool. In a machine tool configured to perform processing at a tip, an insertion means for inserting a relative position detector having a detection portion and a reference surface at both ends between the workpiece support surface and the tip of the tool; After bringing the reference surface of the detector into contact with one of the tips of the tool, the table and the tool a moving means for relatively moving the table and the tool; a storage means for storing the relative position of the table and the tool when the detector operates as a reference position; A calculation means for calculating the amount of relative movement of the tool based on the distance between the reference surface of the detector and the detection part and the finished dimensions of the workpiece. Movement control device.