JPS6130302A - Cnc lathe for precision lead machining - Google Patents

Abstract

PURPOSE:To highly improve the cutting accuracy and the machine speed of the captioned lathe by so constituting it as to perform lead machining of a workpiece by numerically controlling each of servo motors for a Z axis, an X axis, a main spindle, and machining. CONSTITUTION:The captioned lathe is constituted in such a way that a spindle 8 holding a workpiece 1 and rotated by a spindle motor 7 is arranged to a machine body 6. Then, when the machining of the portion 3 to be machined of a travelled surface is completed, the machining of the portion 5 to be macined of a lead surface is perfoemed. In this machining, same as with the machining of the portion 3, a spindle servo motor 18, the rotation of the main spindle 8 through a worm reduction gear, an X axis servo motor 11, a machining servo motor 21, and a Z axis servo motor 9 for positioning are numerically controlled and a machining slide 22 is guided to slide. And three axes numerically controlled machining of the portion 5 to be machined having four lead grooves is performed by a cutting tool 25 for the machining of the lead surface. Thus, the cutting accuracy of the lathe can be more highly improved and the operationability can also be expected.

Description

[Detailed description of the invention] The present invention relates to a precision lead machining CNC lathe.

This type of precision lead processing is performed, for example, on the outer peripheral surface of a fixed cylinder that serves as a tape running guide for a VTR.

Therefore, the lead processing surface must be processed with high precision to prevent damage to the tape and to prevent excessive slippage.

FIG. 4 is a perspective view of this fixed cylinder, FIG. 5 is a vertical cross-sectional view, FIG. 6 is a lead development view, and FIG. 7 is a partially enlarged view.

As shown in FIG. 5, the workpiece (1), that is, the fixed cylinder, is subjected to turning work on not only the lead machining part (a) but also general machining parts (b) such as the outer periphery and the inner periphery.

In addition, when machining leads, not only coaxiality, parallelism, surface area, but also the distance of the θ displacement position (b) and the lead at the 270 degree displacement position and the 90 degree displacement position (of the piece), as shown in Figure 6. Straightness is required.

In addition, since it is difficult to process the lead processing part (a) at the same time, as shown in FIG. ) and a lead surface processing section (5).

Conventionally, these leads have been processed using a cam copying lathe.

The configuration of this cam copying type lathe is such that a mask cam is attached to the main shaft, and the tool rest is moved to copy by the copying action of the mask cam and cam follower, and lead machining is performed on a fixed cylinder by following the shape of the mask cam. be.

However, this profiling lathe has a certain limit to accuracy improvement 1'.

That is, due to its basic mechanical structure, the mask cam and necessarily the cam follower are part of its configuration.
There is a certain limit to the machining accuracy of the mask cam, and if the scanning speed is increased, a jump phenomenon tends to occur between the mask cam and the cam follower, which reduces the followability and also tends to cause mutual abrasion, which makes it difficult to expect high accuracy. do not have.

In addition, in manufacturing a mask cam, multiple cam corrections are required due to processing constraints, and the presence of a copying motion transmission portion complicates a double slide mechanism and the like.

Furthermore, especially when changing the size of the fixed cylinder, the mask cam must be replaced, resulting in low adaptability and flexibility.

For these reasons, there is a strong demand for a fully numerically controlled high-precision lead machining lathe.

In view of these points, the present invention aims to provide a precision lead machining CNC lathe that can eliminate the above-mentioned disadvantages.

The invention will now be explained with reference to the accompanying drawings.

This lathe is equipped with a main shaft (8) that grips a workpiece (1) on a machine body (6) and is rotationally driven by a main shaft (7) E.

A two-axis slide α guided and slid in the axial direction of the main shaft (8) by a two-axis servo motor (9) in front of the body (6).
1, an X-axis slide minnow guided and slid in the radial direction of the main shaft (8) by a Xi/dJf-bo motor aυ is installed on the two-axis slide Ql), and a cutter is placed on the X-axis slide a3. In a lathe in which a stand (13) is installed and a cutter a is attached to the tool stand (L3), the main gear (I) is attached to the main shaft (8).
A shift slide α is provided on the body (6), which is slid back and forth by a shift cylinder σe. A shift gear (A) is provided, and the shift gear (A) is connected to the shift slide (A).
I? ) is configured to be able to engage and disengage equally from the main gear (L), and is guided and slid in the axial direction of the main shaft (8) by the X-axis slide (L processing servo motor I21). A blade is installed, a lead processing tool post (C) is provided on the processing slide (C), and a running surface processing tool (goods) and a lead surface processing tool are installed on the lead processing tool post 0.1. (c) Attach the shift gear frame to the main gear αω, and attach the two-shaft napo motor (9).

The X-axis servo motor αυ and the main shaft servo motor α barrel.

This is a precision lead machining CNC lathe characterized by numerically controlling the machining servo motors 01) to perform lead machining on the workpiece (1).

This example will be explained in more detail.

Figure 1 shows the overall structure.

In this embodiment, the main shaft (8) is rotationally driven by a main shaft motor (7) using a pulley and a belt (c).

Also, each slide α14 (c) is connected to each motor (9) (1
1) It is slid by a ball screw mechanism (21).

In addition, the main shaft motor (7) of this embodiment has a power of 3000 (r.p.
A variable speed motor of the order of -m) is used, and a servo motor of the order of 500 (rpm) is used for the main shaft chibo motor α barrel.

Further, the knife (141) is a cutting knife of the general processing section (b).

Further, in this embodiment, the two-axis servo motor (9) and the X-axis servo motor circle are controlled by the first NC control circuit, and the main axis servo motor end and the processing servo motor are controlled by the first NC control circuit. υ is controlled by a second NC control circuit, and a mail function is built into each circuit to enable connection with external signals.

Further, in this embodiment, the main shaft (8) is rotatably supported on the body (6), a chuck end is attached to the tip thereof, and the chuck end is opened and closed by the push/pull action of a drawer.
It is configured to grip the workpiece (1), and furthermore, the shift slide (L?) is attached to the main shaft (8) on the side of the machine body (6).
The shift cylinder αe is arranged inside the side part so as to be slidable in the axial direction of the shift cylinder αe, and this Rondo CD is connected to the mounting plate p3 of the shift slide 17). Install the main shaft servo motor (2),
A worm reduction mechanism is installed inside the shift slide housing, and the worm vertical shaft is connected to the main shaft servo motor (
2), the worm circle and the form wheel CD are engaged with each other, and the shift gear (2) is fixed to the horizontal axis of the form (4).

Since this embodiment has the above-mentioned configuration, first, the general machining section (b) of the fixed cylinder, which is the workpiece (1), is machined.

The machining of this general machining section (b) is performed using the spindle motor (7) &:
The rotation of the main shaft (8) and the two-axis servo motor (9)
The axis servo motor circle is numerically controlled, and its two-axis slide aQ
・The X-axis slide @ is guided and slid at high speed by the blade α4.

When the machining of the general machining part (b) is finished, the lead machining part (a) is finished.
) processing is performed.

This lead processing part (a) is the running surface processing part (
3) and the lead surface processing part (4) having the lead groove (4).
5) Processed separately.

In this example, first, the running surface processing section (3) is processed.
・I get caught.

Before machining the running surface machining section (3), the shift cylinder a'D is activated, slides the shift slide a'D, engages the V gear 4 with the main gear α, and the main shaft motor (no load is applied) Then, the drive is switched so that the main shaft (8) is rotated at a low speed by the main shaft servo motor (18) via the form reduction mechanism.

Therefore, the machining of the running surface machining section (3) involves the rotation of the main shaft (8) by the main shaft Chivo motor circle, the two-axis servo motor (9), and the processing servo motor (2υ and positioning
The axis servo motor is numerically controlled and the machining slide (24
While guided and sliding in synchronization with the rotation of the main shaft (8), the two-axis slide C11) is guided and slid to give feed, and the running surface machining part (3) is progressively machined by the running surface machining cutter (2).
) 3-axis numerical control machining is performed.

When the running surface processing section (3) is finished, the lead surface processing section (5) is processed.

The machining of this lead surface machining section (5) is carried out in the running surface machining section (3).
), the rotation of the main shaft (8) by the main shaft servo motor αQ, the worm reduction mechanism Kasumi (;), the X-axis servo motor I, the processing servo motor υ, and the two-axis servo motor (9) for positioning are numerically controlled. The machining slides CI! are guided and slid in synchronization with the rotation of the main shaft (8), the X-axis slide (L) is guided and slid, and the lead surface processing cutter (c) is used to guide and slide the lead groove (4). ) with lead surface processing part (5)
3-axis numerical control machining is performed.

This completes the machining of the general machining section (b) and lead machining section (a) of the workpiece (1).

In addition, during the above processing procedure, after the machining of the lead machining part (a) is completed, the machining of the general machining part (b) may be performed subsequently, and also the machining of the general machining part 2) and the lead machining. Part (a) may be processed in the reverse order.

As described above, the main shaft (8) grips the workpiece (1) on the machine body (6) and is rotationally driven by the main shaft motor (7).
), and a two-axis servo motor (
9) guided and slid in the axial direction of the main shaft (8) 2
An X-axis slide (L4) which is guided and slid in the radial direction of the main shaft (8) by an X-axis motor aυ is disposed on the two-axis slide 4, and the X-axis slide a In a lathe in which a turret (13) is disposed on the turret and a cutter α is attached to the turret a, the main gear α is attached to the main shaft (8).
The above body (6) ζ; shift slide 1 that is reciprocated by the shift cylinder ae; ),
A shift gear wing rotationally driven by a main shaft servo motor Q8 is disposed on the shift slide αη, and the V gear wing is configured to be able to engage and disengage from the main gear aS by reciprocating sliding of the shift slide (171), and Slide... A machining slide 4 is provided which is guided and slid in the axial direction of the main shaft (8) by a double machining servo motor circle t-,
The processing slide Q31! - A turret for lead machining (c) is installed, and the turret for lead machining is provided.
and the lead surface machining cutter (c) are attached, the shift gear blade is engaged with the main gear a5&=, and the two-axis servo motor (9), the X-axis servo motor I, the main shaft chivo motor end, and the machining servo motor υ are each numerically controlled. Then, to perform lead machining on the workpiece (1), shift the main shaft (8) to the main shaft motor (7) using the V cylinder αe.
Alternatively, the main shaft servo motor (which can be rotated by selecting 1s) is used.The machining of the general machining section (b) is performed by the high-speed main shaft motor (7), and the machining of the lead machining section (a) is performed by the low-speed rotary motor. It can be rotationally driven by the main shaft servo motor CI8, and the machining of the lead machining section (a) with a force of λ is performed by a compound movement with the machining slide rail υ guided and slid by the machining motor circle. Numerically controlled machining is possible with the cutter (goods) and the lead surface machining cutter (c), and in particular, the rotation of the spindle f (Mabomotor Kasumi) is transmitted to the spindle (8) via the form reduction mechanism. As it rotates at a low speed, the rotational torque improves, and from this, the synchronization between the spindle servo motor (18) and the machining slide (c),
In addition to improved followability and high-precision precision lead machining, since it is not a mask cam type copying model, the various disadvantages mentioned above can be eliminated, and even higher precision and speed can be expected.Moreover, by changing the program Flexibility in changing the size of the workpiece can also be significantly improved. .

As described above, the intended purpose can be fully achieved.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is an overall configuration diagram, FIG. 2 is a vertical sectional view of the main part, FIG. 3 is a vertical sectional view of the shift slide part, and FIG. FIG. 5 is a perspective view of the fixed cylinder, FIG. 5 is a longitudinal cross-sectional view thereof, FIG. 6 is a developed view of its leads, and FIG. 7 is a partially enlarged view thereof. (1) Workpiece, (6) Machine body, (7 units/main shaft motor, (8) Main shaft, (9) 2-axis servo monitor, (
FIZ axis slide, μυ・・X axis servo motor, α4・
・X-axis slide, (L3...Turret, I...Cutter, α4...Main gear, (Ll19...Shift cylinder, 1η
0・Shift slide, α～・Main shaft servo motor, or・
・Form reduction mechanism, kiln...shift gear, ■υ...machining servo motor, working...machining slide, (c)...turret for lead machining, (Foundation)...turret for regular surface machining, (c)
...Knife for processing lead surfaces. June 29, 1980 Applicant: Toru Takahashi Inventor: Toru Takahashi

Claims (1)

[Claims] A main shaft that grips a workpiece and is rotationally driven by a main shaft motor is disposed on the machine body, and a Z-axis slide that is guided and slid in the axial direction of the main shaft by a Z-axis servo motor is disposed in front of the machine body. An X-axis slide that is guided and slid in the radial direction of the main shaft by an X-axis servo motor is disposed on the Z-axis slide,
In a lathe in which a tool post is arranged on the X-axis slide and a cutter is attached to the tool post, a main gear is arranged on the main shaft,
A shift slide that is slid back and forth by a shift cylinder is disposed in the above-mentioned body, a shift gear that is rotationally driven by a main shaft servo motor via a worm reduction mechanism is disposed on the shift slide, and the shift gear is moved back and forth by the shift slide. A machining slide is configured to be able to engage and disengage from the main gear by sliding, and is provided with a machining slide that is guided and slid in the axial direction of the main shaft by a machining servo motor on the X-axis slide, and a lead machining tool rest is provided on the machining slide. A cutting tool for machining the running surface is installed on the tool post for lead machining, the shift gear is meshed with the main gear, and the Z-axis servo motor, the X-axis servo motor, the main shaft servo motor, and the machining servo motor are respectively operated. A precision lead machining CNC lathe characterized by numerical control and lead machining of workpieces.