JPS6113205Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an NC turret lathe, and particularly to a cutting edge measuring device for an NC turret lathe.

When using this type of turret lathe, when machining multiple pieces of the same item, the dimensions of the workpiece are measured as appropriate to ensure that the workpiece dimensions do not exceed allowable values due to wear of the cutting edge, etc. The position of the cutting edge is adjusted each time. At this time, as a method for correcting the position of the cutting edge, especially when replacing the tool holder, it is possible to determine the absolute origin and always make the adjustment to match that value. However, in this case, if the blade edge measuring device is displaced, accurate correction of the origin cannot be performed, so the blade edge measuring device must be kept completely fixed, which is a practical difficulty.

In addition, turret lathes have the advantage that the same tool can be mounted on multiple tool support surfaces on the turret in advance, so that when replacing the old tool with a new one, it is only necessary to rotate the turret. In order to rotate the turret, the cutting edge measuring device must be moved back to a retracted position away from the turret.If the cutting edge is moved forward and backward repeatedly, the advancing and stopping position of the measuring head of the measuring device will inevitably shift slightly and the measurement will be delayed. I was worried that the accuracy would drop.

Therefore, the present invention was developed in view of the above points, and the gist is that reference pins are provided on each tool support surface on the turret at equal distances from the center of the turret, and that a reference pin is provided in the vicinity of the reference pin. A tool holder is provided so that the tool cutting edge is positioned, and a cutting edge measuring device is mounted on the lathe machine base so as to face the tool support surface on which the reference pin and tool holder are provided from above, and the positioning member of the cutting edge measuring device is used during measurement. The position of the cutting edge on each tool support surface is measured under the same conditions by bringing the measuring member into contact with the reference pin on the turret each time, and displacing the measuring member in accordance with the swinging movement of the swinging member of the cutting edge measuring device. This is what I did.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIGS. 1 and 2 show the positional relationship between the cutting edge measuring device and the turret lathe according to the present invention. That is, a spindle housing 101 and a carriage 102 are installed on a bed 100 serving as a lathe machine stand.The spindle housing 101 is equipped with a chuck 103 for gripping a workpiece, and the carriage 102 is equipped with a turret rod 10.
A turret 105 is attached via 4. Furthermore, the tool support surface 105a of the turret 105
A tool holder 106 to which a cutting edge 18 and a reference pin 21 are fixed is bolted to. The turret 105 is moved in the Z direction shown in the first figure by the forward and backward movement of the turret rod 104, and in the X direction shown in the second figure by the reciprocating movement of the carriage 102. In the pre-start position, a cutting edge measuring device 107, which will be described above, is provided on the bed 100 as a lathe machine base so as to move up and down. At this time, the blade edge measuring device 107 is connected to the double-opening cover 2 which is always closed.
5 is lowered while opening in the third direction A shown in the figure, and first, the positioning member 22 described below comes into contact with the reference pin 18, and after determining the reference position, the measuring member 13 described below
The position is measured by moving the .

From the center C of the turret 105 to the reference pin 2
The distances to 1, that is, a1 and a2 are both set equal.

Next, the blade edge measuring device 107 will be described in detail based on FIGS. 3 and 4.

A fixing member 4 and a swinging member 5 are attached to the concave portions 3a and 3b of the support body 3 attached to the guide plate 1 with set screws 2, respectively, and one end of the fixation member 4 is fitted into the support body 3. The other end is fixed to the guide plate 1 with a set screw 6. A shaft 8 is supported between the shaft support members 7 , 7 fixed to the fixed member 4 , and the swinging member 5 is fixed to the shaft 8 by a hexagonal bolt 27 . Note that the shaft 8 has a spherical surface 24a at the tip.
It is rotatably held by a locking bolt 24 having a diameter. Therefore, the swinging member 5 can swing together with the shaft 8 between the shaft support members 7, 7.

On the other hand, between the swinging member 5 and the fixed member 4,
A compression spring 9 is interposed, and a connecting member 10 is fitted and fixed in the circular notch 5a of the swinging member 5, and its contact surface 10a is in contact with the upper end surface of the swinging member 5. . The connecting member 10 has a notch 10b in the center, and a concentric circular notch 1
0c and 10d, a differential transformer 11 is installed in the circular notch 10c and fixed with a set screw 12, and a measuring member 13 is freely inserted into the circular notch 10d. has been done. One end of the measuring member 13 forms a flange 13a, and a flange 15 to which a contact member 14 made of carbide is fixed is fixed to the other end. Both diameters are larger than the circular notch 10d. Further, an annular member 16 is fixed to the circular notch 10d, and a compression spring 17 is installed between the annular member 16 and the collar member 15.
Therefore, when the contact member 14 is not in contact with the cutting edge 18, the collar portion 13a of the measuring member 13 is brought into contact with the connecting member 10 due to the action of the compression spring 17; Due to the action of the compression spring 9, the swing member 5 is pressed against the lower end of the recess 3b of the support body 3. Therefore, the guide plate 1, the support body 3, the fixed member 4, the swinging member 5, the connecting member 10, etc. are all integrated, and a fluid cylinder, etc. (not shown) is screwed to the fixed member 4 with the screw 19. As the drive shaft 20 of the drive device moves up and down, it moves up and down integrally.

Further, a positioning member 22 is fixed to the connecting member 10 at a position opposite to the reference pin 21. The reference pin 21 is connected to the turret 1 as described above.
It is provided at a fixed position from the axis C of the tool holder, and remains unchanged even when the tool holder is replaced.

The differential transformer 11 is a well-known type, and is configured to electrically convert the amount of displacement by moving the core 11a back and forth. 23 is a spring for adjusting the surface pressure when the differential transformer 11 is brought into contact with the measuring member 13; 25 is a double-open dust-proof cover that is always closed as described above; and 26 is the shaft The collars mounted between the support member 7 and the swinging member 5 are shown, respectively.

The operation of the above configuration will be described below.

The driving force of a drive device (not shown) is transmitted to the fixed member 4 via the drive shaft 20, and the guide plate 1, support body 3, swing member 5, connecting member 10, etc. move integrally. Now, when the fixing member 4 is pushed down, the spherical surface 22a at the tip of the positioning member 22 first comes into contact with the reference pin 21. At this time, the lower surface of the swinging member 5 is still in contact with the recess 3b of the support body 3 due to the action of the compression spring 9, and the collar 13a of the measuring member 13 is also in contact with the connecting member 10 due to the action of the compression spring 17. are in contact.

Further, the fixing member 4 is pushed down, and the abutting member 14 fixed to the collar member 15 is moved to the cutting edge 18 of the cutting tool.
When the measuring member 13 is brought into contact with and pressed, the compression spring 17 is compressed, and the measuring member 13 is pushed up, and its collar portion 13a is separated from the connecting member 10, and is located in an intermediate state. That is, differential transformer 1
The core 11a of No. 1 is pushed upward. In addition,
At this time, the compression spring 9 is also compressed, and the swinging member 5 comes to swing together with the connecting member 10 about the shaft 8 as a fulcrum.

In this way, when the position measurement of the cutting edge 18 is completed, the turret is rotated and replaced with a tool holder having a new cutting edge, and at this time, by the same operation as above,
The blade edge position is measured, these two measured values are compared, and a correction value for the blade edge position is determined. This can be done using known controllers.

Furthermore, in the above example, for example, the first tool
By machining 100 pieces and machining 100 pieces with the second tool, the measurement was taken when changing the tool, but if the above measurement is performed every time one machining is completed, it is possible to perform correction control for cutting edge wear. can.

In the above embodiment, in order to measure the stability of the operation, a collar member 15 fixed to the measuring member 13 and an annular member 16 fixed to the connecting member 10 are provided between the fixed member 4 and the swinging member 5. Although compression springs 9 and 17 are interposed between them, the present invention is not limited to this, and these compression springs 9 and 17
It is also possible to remove them and use their own weight.

As detailed above, according to the present invention, the positioning member of the cutting edge measuring device is brought into contact with the reference pins provided on each tool support surface on the turret at equal distances from the turret center, and the cutting edge is measured. Since the measuring device can always be measured under the same relative positional relationship with respect to the center of the turret, even when rotating the turret and measuring different tools on different tool support surfaces, the same position can be maintained. It can be measured under various conditions and provides high measurement accuracy. Therefore, the relative difference in the position of the cutting edge between the tools on the turret can be determined with great accuracy. Furthermore, since the measuring member is brought into contact with the cutting edge as the swinging member swings, the movement of the measuring member is extremely smooth.

[Brief explanation of the drawing]

Figure 1 is an explanatory side view showing the positional relationship between the cutting edge measuring device and the NC turret lathe according to the present invention;
1 is a front view of FIG. 1, FIG. 3 is a partially sectional explanatory view of the cutting tool measuring device according to the present invention, and FIG. 4 is a bottom view of FIG. 3. 4... Fixed member, 5... Swinging member, 7... Shaft support member, 13... Measuring member, 18... Cutting edge, 21
...Reference pin, 22...Positioning member, 100...
...Bed (machine base), 105...Turret, 105
a... Tool support surface, 106... Tool holder, 1
07...Blade edge measuring device, C...turret center, a
1, a2... distance.

Claims (1)

[Scope of utility model registration request] A reference pin is provided on each tool support surface on the turret at the same distance from the center of the turret, and
A tool holder is provided so that the tool cutting edge is located near the reference pin, and a cutting edge measuring device is mounted on the lathe base so as to face the tool support surface on which the reference pin and the tool holder are provided from above, The measuring device includes a fixed member that moves up and down by a drive device, a swinging member that is swingably mounted on a shaft support member connected to the fixed member, and a positioning member and a measuring member that are mounted on the swinging member. With the descending movement of the drive device, the positioning member is brought into contact with the reference pin on the turret, and with the swinging movement of the swinging member, the measuring member is displaced, and each An NC characterized in that the position of the cutting edge on the tool support surface is measured under the same conditions.
Cutting edge measurement device for turret lathes.