JPH0596449A - Indexing method for turret lathe intended for rotary tool - Google Patents

Abstract

PURPOSE:To shorten the indexing time. CONSTITUTION:A positioning pin 15 is engaged, only when a turret 7 is indexed to an angle of use for a rotary tool 9, and left as placed in a disengaged condition in the case for the other tool 10. Engaging action of the positioning pin 15 is performed during action of the turret 7 approaching a spindle 3 by a quick feed from a position of the original point separated from the spindle 3. The positioning pin 15 performs positioning a supporting frame 13 of a mechanism 12 for transmitting rotation of a rotary tool drive shaft 11 to the rotary tool 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indexing method for a rotary tool specification turret lathe equipped with rotary tools such as a milling cutter and a drill.

[0002]

2. Description of the Related Art Conventionally, a turret lathe equipped with a rotary tool such as a milling cutter or a drill, which is configured to transmit a rotation from a single rotary drive shaft provided at the center of the turret to each rotary tool on the peripheral surface of the turret. There is. The transmission mechanism for transmitting the rotation from the rotary drive shaft to the rotary tool is supported by a transmission mechanism support frame provided to face the front surface of the turret.

The transmission mechanism support frame is attached to the tip of a coolant pipe penetrating the inside of the rotary drive shaft and is supported in a non-rotating state. Further, by supporting the positioning pin provided on the transmission mechanism support frame with the turret, the support is stabilized. When the turret is indexed, the positioning pin is pulled out so as not to hinder the rotation, and after the indexing is completed, the positioning pin is projected to be in an engaged state.

[0004]

The positioning pins are
It is necessary to fix the transmission mechanism support frame when using the rotary tool, and positioning is not necessary when using a tool other than the rotary tool. However, conventionally, regardless of whether the tool attached to the turret is a rotary tool or not,
Since the positioning pin is inserted / removed for each indexing of the turret, there is a problem that the indexing time is lengthened by the inserting / removing operation.

An object of the present invention is to provide an indexing method for a rotary tool specification turret lathe which can shorten the indexing time.

[0006]

According to a first aspect of the present invention, there is provided a non-rotating transmission mechanism supporting frame provided on the front surface of a turret so as to rotate from a rotary tool drive shaft centering on the turret to a rotary tool. The present invention is applied to a lathe in which a transmission mechanism for transmitting is provided, and a positioning pin capable of protruding and retracting which engages with a turret is provided in the transmission mechanism support frame. In the lathe having such specifications, the positioning pin is engaged only when the turret is indexed to the use angle of the rotary tool.

According to a second aspect of the indexing method, in the lathe having the first aspect, the engaging operation of the positioning pin is performed while the turret is moving, for example, during fast-forwarding. The positioning pins may be engaged only when the rotary tool is in the indexing state, or may be engaged when the tools other than the rotary tool are in the indexing state.

[0008]

According to the method of the present invention, the positioning pin is engaged only when the rotary tool is indexed, and the positioning pin is not engaged when the other tools are indexed. Therefore, this engagement is omitted. The indexing time is shortened by the removal time.

According to the method of the second aspect of the present invention, since the positioning pin engaging operation is performed while the turret is moving, it is not necessary to spend a dedicated time for the positioning pin engaging operation.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. FIG. 2 shows a schematic plan view of a turret lathe to which the present invention is applied and a block diagram of a control system. A bed 3 is provided with a spindle 3 via a spindle stock 2, and a turret slide 4 is installed laterally (X-axis direction) on a rail 5 on the side of the spindle stock 2. The turret slide 4 has a turret 7 mounted via a turret shaft 6 so as to be movable back and forth (Z axis direction) and rotatable for indexing, and is moved by a servomotor (not shown) via a feed screw 8. . A front-back movement mechanism and an indexing mechanism (not shown) of the turret 7 are provided on the turret slide 4.

The turret 7 is a drum having a polygonal front shape, and a rotary tool 9 such as a drill or a milling cutter and a fixed tool 10 such as a bite are mounted on each tool station S consisting of a peripheral surface portion. Has been done. Each rotary tool 9 has one rotary tool drive shaft 11 penetrating the center of the turret shaft 6.
From the above, the rotation is transmitted via the transmission mechanism 12. The rotary tool drive shaft 11 is connected to a drive motor (not shown) at the rear end of the turret shaft 6.

The transmission mechanism 12 is supported by a transmission mechanism support frame 13 provided so as to face the front surface of the turret 7, and the transmission mechanism support frame 13 is provided at the center of the turret 7 as will be described later with reference to FIG. It is supported in a non-rotating state. A positioning pin 15 that engages with and disengages from the positioning hole 14 of the turret 7 is installed at one end of the transmission mechanism support frame 13 so as to be driven by a pin projecting / retracting cylinder 16.

The NC device 17 is means for controlling the entire lathe, and comprises an NC function section and a programmable controller section. The programmable controller unit is provided with pin insertion / removal control means 18 including a sequence program for performing the control operation of FIG.

FIG. 4 is an enlarged horizontal sectional view of the turret 7. The turret 7 is fixed to the tip of the turret shaft 6, and the rotary tool drive shaft 11 is inserted into the turret shaft 6. The rotary tool drive shaft 11 is formed hollow, a coolant pipe 19 is inserted therein, and the transmission mechanism support frame 13 is fixed to the tip of the coolant pipe 19 via a tip fixing member 21. The coolant pipe 19 is fixed to the turret slide 4 (FIG. 2) at the rear end in a non-rotating state, and therefore the transmission mechanism support frame 13 is also fixed to non-rotating. A non-rotating turret front cover 20 is attached to the transmission mechanism support frame 13.

The transmission mechanism 12 includes a rotary tool drive shaft 11
From the outer peripheral gear 22 provided on the outer periphery of the tip of the first intermediate gear 2
Output bevel gear 25 via the third and second intermediate gears 24
When the rotary tool 9 is attached to the turret 7, the input bevel gear 26 meshes with the output bevel gear 25. The output bevel gear 25 is attached to an intermediate shaft 27 that is integral with the second intermediate gear 24, and the intermediate shaft 27 and the support shaft of the first intermediate gear 23 are supported by the transmission mechanism support frame 13.

The positioning pin 15 is used for the transmission mechanism support frame 13.
The piston 15a is integrally provided with a piston rod of a pin projecting and retracting cylinder 16 which is an air cylinder provided in the. The pin projecting / retracting cylinder 16 is of a spring return type, and includes a return confirmation switch 28 including a proximity switch.
Is attached. The positioning hole 14 is formed in a tubular member 29 integrally fixed to the main body of the turret 7. The turret 7 is fixed to the turret slide 4 at each indexing angle by the meshing coupling, but the description of the structure and operation thereof is omitted.

Next, the indexing operation will be described. The indexing rotation of the turret 7 is performed at the origin position where the turret slide 4 is farthest from the headstock 2 as shown by the chain line in FIG. , Move to low speed machining operation.

FIG. 5 is a flow chart of the indexing operation. If there is an indexing command (S1) and the positioning pin 15 is in the on state (S2), the positioning pin 15 is removed (S3) and then the indexing operation (S4). When the positioning pin 15 is in the released state, the indexing operation (S4) is directly performed. In either case, after the completion of the indexing rotation, the positioning pin 15 is left in the pulled-out state, and the inserting operation is not performed.

After that, the turret slide 4 is moved as described above by giving a fast-forward shaft feed command (S5).
Fast-forward to the headstock 2 side. In this case, when the rotary tool 9 is indexed in the above-described indexing process, a rotary tool rotation command is given to start rotation, and then a shaft feed command is given. Based on this rotary tool rotation command, it is determined whether the indexing tool is the rotary tool 9 or the fixed tool 10 (S
6) If the tool is a rotary tool, the axis feed command (S5)
At the same time, a command for the insertion operation (S7) of the positioning pin 15 is performed.

For this reason, when the turret slide 4 is fast-forwarded and the positioning pin 15 is inserted (engaged), the turret 7 approaches the spindle 3 as shown by the solid line in FIG. The engagement of the positioning pin 15 is completed. By engaging the positioning pin 15 in this way, the rotation of the rotary tool drive shaft 11 is stably transmitted.
Is transmitted to the rotary tool 9 via.

When the fixed tool 10 is indexed in the indexing process, the positioning pin 15 is not inserted (S7), but only the turret slide 4 is moved. Therefore, as shown in FIG. 1A, machining is performed by the fixed tool 10 while the positioning pin 15 remains in the non-engaged state.

As described above, according to this indexing method, the positioning pin 15 is engaged only when the rotary tool 9 is indexed, and the positioning pin 15 is not engaged when the fixed tool 10 is indexed. The indexing time is shortened by the time when the removal is omitted. In addition, since the engaging operation of the positioning pin 15 is performed during the movement of the turret 7, it is not necessary to spend a dedicated time for the engaging operation of the positioning pin 15.

In the above embodiment, the turret slide 4 is used.
Although the positioning pin 15 is engaged during the axial feeding of the shaft, when the rotary tool 9 is used, the positioning pin 1
Axial feed may be started after the engagement operation of 5. Further, when the engaging operation of the positioning pin 15 is performed during the axial feeding, the positioning pin 15 may be engaged regardless of the type of the tools 9 and 10. In that case, turret slide 4
The positioning pin 15 may be removed during the return to the original position.

[0024]

According to the method of the present invention, the positioning pin is engaged only when the rotary tool is indexed, and the positioning pin is not engaged when the other tools are indexed. Therefore, this engagement is omitted. There is an effect that the indexing time is shortened by the engaging / disengaging operation time.

According to the method of the second aspect of the present invention, since the positioning pin engaging operation is performed during the movement of the turret, it is not necessary to spend a dedicated time for the positioning pin engaging operation, and the indexing time is accordingly. Has the effect of being shortened.

[Brief description of drawings]

FIG. 1 is an operation explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a schematic plan view of a lathe to which the embodiment is applied and a block diagram of a control system.

FIG. 3 is a schematic front view showing the relationship between the turret and the transmission mechanism support frame.

FIG. 4 is also an enlarged horizontal sectional view of the turret.

FIG. 5 is a flow chart showing the indexing method.

[Explanation of symbols]

3 ... Spindle, 4 ... Turret slide, 7 ... Turret, 9 ...
Rotary tool, 10 ... Fixed tool, 11 ... Rotary tool drive shaft, 1
2 ... Transmission mechanism, 13 ... Transmission mechanism support frame, 14 ... Positioning hole, 15 ... Positioning pin, 16 ... Pin projecting / retracting cylinder, 1
8 ... Pin removal control means, 19 ... Coolant piping

Claims (2)

[Claims] 1. A transmission mechanism for transmitting rotation from a rotary tool drive shaft at the center of a turret to a rotary tool is provided on a non-rotational transmission mechanism support frame provided to face the front surface of the turret, and the turret is provided on the transmission mechanism support frame. A rotary tool specification turret lathe indexing method in which a turret is provided with engaging and retractable positioning pins, wherein the positioning pins are engaged only when the turret has been indexed to the use angle of the rotary tool. 2. A method for indexing a rotary tool specification turret lathe according to claim 1, wherein the positioning pin engaging operation is performed while the turret is moving.