JPS6033605B2 - Turret lathe with tool spindle drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive device for a tool spindle, which is optionally provided in a lathe having a turret.

In recent years, numerically controlled machine tools have become more complex, and in addition to the conventional turning function, lathes are also equipped with a power-driven tool spindle that holds a rotary tool and rotates with power.
So-called compound lathes have emerged that have the next required milling function and the function of drilling holes other than center holes, eccentric holes, side holes, etc.

There are two types of compound lathes: one is a machining center that focuses on turning, and exists as a complete compound machine tool that has a dedicated tool headstock equipped with an automatic tool changer, for example. One is that the main machining function is a turning function, and depending on the shape of the target workpiece, it is also called a semi-complex machine tool that performs simple milling, drilling, etc. by using attached equipment. It should be called. For compound lathes like the latter, it is difficult to have a dedicated tool headstock due to the nature of the machine.
For example, it would be convenient if a tool rest for turning such as a turret could be provided with a tool spindle that can be installed alongside a turning tool and is detachable.

An example of a conventional tool spindle drive device for a compound lathe based on this idea is shown in FIG. Here, a tool spindle holder 53 can be detachably attached to the outer periphery of the turret 51' along with a turning tool holder 52. In addition, the tool spindle drive shaft 5 mounted on the rotation center line of the turret 51
4 has an inner hole 51 formed in the turret 51.
The drive bevel gear 55 is fixedly attached within the space a. The tool spindle holder 52 holds a rotatable tool spindle 57 that is supported by a bearing 56 on an axis perpendicular to the rotation center line of the turret 51, and has a shaft portion 53a concentrically therewith. The bag portion 5 is inserted into the hole 51b provided in advance in the bag portion 51.
3a, so that one end of the tool spindle is exposed to the inner hole 51a. A driven bevel gear 58 that meshes with the driving bevel gear 55 is installed in this tool spindle machine section, thereby transmitting the rotation of the tool spindle drive shaft 54 to the tool spindle 57. According to such a tool spindle drive device, when complex machining is not required at all, the tool spindle drive shaft 54
, the turret 51 can be used as a complete turning-dedicated tool post without assembling the drive bevel gear 55, etc., and a chisel tool spindle drive shaft 54 can be installed when complex machining is required depending on the shape of the workpiece. and the tool spindle holder 53 as necessary.
It is very convenient because you can perform the required complex processing by attaching and detaching the parts.

However, the hole 511b needs to be machined in the turret 51 regardless of whether compound machining is required, and it is extremely wasteful if the turret 51 is used as a tool post exclusively for turning without the need for compound machining.

In other words, the turret 61 requires high component accuracy in order to maintain indexing accuracy, and the hole 51b also requires machining using a jig boring machine, etc., and the presence or absence of such machining has a large effect on the length of the part machining time. This is because it has an impact. In view of this point, the present invention realizes a tool spindle drive device that can create a turret shape with less waste even when complex machining is not required, especially in lathes in which the tool spindle can be attached to and detached from the turret. The purpose is to

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 2 is a sectional view of a tool spindle drive device according to an embodiment of the present invention, in which 1 is a headstock, 2 is rotatably supported on the headstock 1, and a collet chuck (not shown) is attached to the tip. 4 is a main shaft that grips and rotates a rod-shaped material 3; 4 is a stacking table slidably mounted on a longitudinal feed table (not shown) and placed opposite the headstock 1; 5 is a stacking table 4; The turret has a rotating support shaft 5a inserted through the main shaft 1, and has a polygonal prism shape with a tool mounting surface 5b parallel to the center line of the main shaft 1. A pair of couplings 6a fixed to Yuichi let 5 itself?
It is positioned and held by 6b. Reference numeral 7 indicates a tool main shaft drive shaft which is disposed on the rotation center line of the turret 5, is rotatably supported by a bearing 8 mounted on the turret 5, and rotates by being powered by a motor (not shown); It is a drive bevel gear that is arranged to protrude further forward from the front end surface of the let 5, here, toward the headstock 1 side, and is fixed to the tool spindle drive shaft 7.

Further, 10 is a mounting plate detachably fixed to the tool mounting surface 5b of the turret 5 with bolts 10a, and 11 is the mounting plate 1.
The housing is equipped with iron and fixed with bolts 11a, and together with the mounting plate 10 constitutes a tool spindle holder. 12 is a bearing 13, 1 attached to the housing 11.
4 is a tool spindle rotatable around an axis perpendicular to the rotation center line of the turret 5; 15 is a tool spindle 12;
A collet chuck 17 is fixed to the side opposite to the tool of the tool spindle 12 and is a driven bevel gear that meshes with the driving bevel gear 55.

The housing 111 constituting the tool spindle holder is formed with a ball portion 11b having the same shape as the driven bevel gear, and a circle ring 18 is inserted into a groove provided in the ball portion 11b. 19 is fixed to the turret 5, and the shaft portion 11
This is a cover that has a hole 19a on its outer periphery into which the drive bevel gear 9 and the driven bevel gear 17 fit.

In such a tool spindle drive device, for example, when it is desired to drill a horizontal hole in the outer peripheral surface of a rod-shaped material 3, the main shaft 2 is first stopped to fix the rod-shaped material 3, and then the turret 5 is rotated to drive the drill 16. index coupling 6a to the use position,
Position with 6b.

Thereafter, the tool spindle drive shaft 7 is rotated, and through the meshing of the drive bevel gear 9 and the driven bevel gear 17, the rotation is transmitted to the tool spindle 12, causing the drill 16 to rotate, and the transverse feed table 4 is sent to feed the bar-shaped material 3. A specified horizontal hole is drilled in the hole. Further, with such a configuration, the meshing portion between the driving bevel gear 9 and the driven bevel gear 17 is exposed to an environment where cutting oil and chips are scattered, so there is a risk of failure.
When mounting the housing 11 on the turret 5, the shaft portion 11b of the housing 11 is inserted into the hole 19a of the cover 19, and the shaft portion 1
An O-ring 18 is arranged between the cover 1b and the hole 19a to completely prevent cutting oil, chips, etc. from entering the inside of the cover 19.

Depending on the shape of the target workpiece, secondary milling functions,
If horizontal hole drilling or eccentric hole drilling functions are not required, use bolt 10a.
All you have to do is loosen the mounting plate 10, remove the tool spindle 12 from the turret 5, and install the necessary turning tool 20 in its place.

In addition, if you do not need any machining function using a secondary tool spindle and just need the turning function, the third
As shown in the figure, the tool main shaft drive shaft 7 and the drive bevel gear 9 may be removed, and the cover 18 may be replaced with a cheaper cover 21. As described above, according to the present invention, since the drive bevel gear 9 protrudes further forward from the front end surface of the turret 5, the turret 5 does not require a cut-out for guiding the driving force outward, and the bearing A tool spindle drive device in which the tool spindle 12 can be detachably attached to the turret 5 can be realized by simply changing the shape of the steel hole 8 and machining the female screw for fixing the hole.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a sectional view of the tool spindle drive device in a compound lathe with a sub-chamber, Fig. 2 is a sectional view of the tool spindle drive device in a compound lathe according to the present invention, and Fig. 3 is a sectional view of the turret excluding the tool spindle drive device. 5...Turret, 7...Tool spindle drive shaft, 9...
・Drive bevel gear, 10...Mounting plate, 11...Housing, 11b...Shaft portion, 12...Tool main shaft 17.
...Driven bevel gear, 18...○ ring, 19...cover, 1
9a...hole. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. In a turret lathe, a tool main shaft drive shaft is rotatably provided on the turning center line of the turret and rotates under power drive; , a first gear fixed to the tool spindle drive shaft; and a first gear detachably attached to the turret, rotatably supporting the tool spindle, and meshing with the first gear to drive the rotation of the tool spindle. A turret lathe having a tool spindle drive device including a tool spindle holder including a second gear that transmits data to a drive shaft, and a cover that covers the first gear and the second gear. 2. A shaft portion concentric with the second gear is formed in the tool spindle holder, and a hole through which the shaft portion is inserted is provided in a cover that is fixed to the turret and covers the first gear and the second gear. A turret lathe having a tool spindle drive device according to claim 1, wherein an O-ring is fitted between the shaft portion and the hole.