JPS6034202A - Multiple tool rest for numerically controlled lathe - Google Patents

Abstract

PURPOSE:To entirely eliminate interference between a tailstock and drive mechanism of rotary tools and simplify structure thereof, by arranging all the drive mechanisms of rotary tools to be contained within the multiple tool rest and the rotary turret so as not to be projecting outwardly of the multiple tool rest. CONSTITUTION:In a multiple tool rest 1 for a numerically controlled lathe with tools 3, 3' and a turning tool attached thereto, a power transmission path transmitting a rotary drive only to the tool 3 which is at a machining position is formed by means of an arrangement of a drive shaft 7 passing through a turret turning shaft 4, a drive gear 8 fixedly attached to the end of the shaft 7 within a turning turret 2, driven gears 11, 11' mounted along the circumference of the turret 2 for rotating the rotary tools, and intermediate gears 10, 10' operably born for sliding in the axial direction between the gear 8 and the gear wheels, 11, 11'. By this design, the drive mechanisms of the rotary tools are entirely prevented from interfering with the tailstock and simplified in their structure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite tool post for a numerically controlled lathe, and more specifically, in a numerically controlled lathe in which a turning tool and a rotating tool are attached to a rotating turret, only the rotating tool in the cutting position is used. This invention relates to a composite tool rest in which a power transmission path for transmitting rotational driving force is formed.

B. Conventional technology In turning a workpiece, in order to finish the workpiece into the required dimensions and shape, tools for external turning, internal turning tools, grooving tools, and drilling tools are required. A large number of tools are required, but (2) in numerically controlled machine tools, all of these necessary tools are attached to the rotating turret of the tool post from the beginning and turning can be performed by commands from the numerical control device. The necessary tools will automatically come to the cutting position.) Turn the rotating Creso 1-, fix the tools in place, and perform turning on the workpiece. In this case, not only the turning tool but also rotating tools such as milling tools, drills, taps, etc. are sprayed on the shaft in advance, and the turning tool and the rotating tool work together to cut the workpiece according to a predetermined machining program. A talent device that can perform processing is called a composite tool rest. The turret-swivel type compound tool rest for numerically controlled lathes can be broadly classified into the following three types of operation types. FIGS. 1 to 3 are top views of turret-swiveling compound tool rests with different operating types. In these drawings, Fig. 1 illustrates a numerically controlled lathe incorporating a turret-swivel type composite tool rest having a rotation axis (B1) parallel to the spindle center line (A), and Fig. 2 illustrates a numerically controlled lathe incorporating a turret-swivel type compound tool rest having a rotation axis (B1) parallel to the spindle center line (A). A)
A numerically controlled lathe is illustrated, which has a turning axis (B2) perpendicular to the plane of the paper, and the turning axis (3) (B2) extends in a direction perpendicular to the plane of the paper. Further, FIG. 3 illustrates a numerically controlled lathe having a turning axis (B3) perpendicular to the spindle center line (A), and the turning axis (B3) extending in the horizontal direction. In these drawings, the same parts are indicated by the same reference numbers, (21) is the headstock, (22) is the main shaft, (2
3) is the chuck that holds the workpiece (24), (25) is the carriage, (26) is the compound tool post, (27) is the rotating turret of the compound tool post, and (28) is the tool holder (29). The rotating tool (27) is attached to the rotary tool, and (30) is a shinshin stand having a shinshin axis (31).

All of these conventional rotary tool drive devices have very complicated structures, and are difficult to accurately position the rotary tool at a predetermined position.
Practical limitations have been recognized in reliably transmitting rotational driving force to the positioned rotary tool. To explain in more detail, the composite tool rest shown in FIG.
) is provided with a drive shaft (32), which drives the rotary tool (2) at the cutting position.
The driven side clutch (8) moves forward toward the tool holder (29) and is attached to the rear end of the tool holder (29).
In many cases, a drive-side clutch (33) that engages with the drive shaft (33°) is attached to the tip of the drive shaft (32). In this structure, the drive device for the rotary tool (28) is the compound tool rest (26).
Since the workpiece (24) is placed on the outer surface of the workpiece (24), there is a problem when cutting the workpiece (24) with the rotary tool (28) while the chuck (23) is holding the workpiece (24). However, the so-called cutting process is performed while supporting one end of the workpiece (24) by the Shinshin axis (31).
In the case of center work, there were cases where the rotary tool drive interfered with the Shinshindai (3o), resulting in restrictions on cutting. Further, a drive source (not shown) such as an electric motor or a hydraulic motor for driving the rotary tool drive device is disposed inside the compound tool post (26) or at a position far away from the workpiece (24) on the rear side. Because there are
Another drawback is that the connection structure between the drive source and the rotary tool drive device (5) is complicated.

Alternatively, a structure has been proposed in which the drive shaft (32) of the rotary tool (28) is incorporated inside the compound tool post (26) as shown in FIG.
) is a complex rotary driving force transmitting mechanism consisting of a sliding gear mechanism (34), an intermediate gear mechanism (35), a driven gear mechanism (36), etc. in addition to the drive shaft (32) as a rotational driving force transmitting means. must be built-in, which has the disadvantage of significantly complicating the overall structure.

On the other hand, in the embodiment shown in FIG.
) from the top surface of the rotary tool (28) to the radius of the workpiece that can be cut on the bed (37), that is, from the top surface of the bed (37) to the center of the spindle (22). It is necessary to match the height, and unless the swing is large, there are design restrictions on incorporating the rotary tool drive device in the compound tool post (26). Furthermore, in the embodiment shown in FIG. 3, it is also possible to dispose the drive shaft (32) outside the composite tool rest (26) (6) as in FIG. 4 above. However, the composite tool rest (26) having such a structure allows multiple tools to be aligned with the spindle centerline (A).
the workpiece (2) with the chuck (23).
4) can be suitably used when cutting is carried out by holding the tool, but the tool is placed perpendicular to the spindle center line (A) as shown by the reference number (28°), and the center When performing cutting using the workpiece method, for example, machining the outer diameter of a shaft, the tool (2B') and the workpiece (24) are used.
Since interference occurs between the two, the applications are greatly restricted.

The main object of the present invention is to provide a composite turret for a numerically controlled lathe having novel structural features that can overcome the above-mentioned disadvantages found in conventional composite turrets for numerically controlled lathes. It is about providing. Another main object of the present invention is to provide a composite tool rest for a numerically controlled lathe, which has a simple structure but has improved operational performance in providing accurate operating positions for tools.

(7) C1 Configuration of the Invention The present invention provides a composite tool rest (1) of a numerically controlled lathe equipped with rotary tools (3), (3") and a turning tool. a drive shaft (7) passing through the swivel turret 7 (2), a drive gear (8) fixed to the tip of the drive shaft (7) inside the swivel turret 7 (2), and a drive gear (8) fixed to the tip of the swivel turret 7 (2).
) for rotating the tool, which is rotatably mounted along the circumferential surface of the drive gear (11, (11')); and the driving gear (8).
The intermediate gear (1) is slidably supported along the axial direction between the driven gears (11) and (11') for tool rotation.
0) and (10'), the gist is a composite tool rest for a numerically controlled lathe in which a power transmission path is formed to transmit rotational driving force only to the rotary tool (3) or (3゛) in the cutting position. It is.

In a preferred embodiment of the present invention, a shifter (19) for axial movement is attached to the intermediate gear (10), (10'), or the intermediate gear (10)
A fitting hole (17) at the tip of the positioning pin (16) is bored on the axis of the intermediate shaft (12), (12') (10°) rotatably supported, and the positioning pin (16) A fitting part into the fitting hole (17) is formed at the tip of the positioning pin (16), and after the turning turret 7 (2) rotates, the fitting hole (17) at the tip of the positioning pin (16) is formed.
The intermediate gears (10), (10°) are slid along the axial direction by using the fitting inside, and the driving gear (8), the intermediate gears (10), (10') and the driven gear ( 11)
, (11'') forms a power transmission path that transmits rotational driving force only to the rotary tool (3) in the cutting position.

2. Embodiment FIGS. 6 and 7 are partially cutaway front views of a composite tool rest for a numerically controlled lathe, illustrating the apparatus of the present invention. First of all, in Fig. 6, (1) is a composite tool rest, (2) is a turning turret 7 which is equipped with a turning tool (not shown) and rotary tools (3), (3') at a predetermined arrangement pitch. It is. The rotating turret (2
) is rotatably supported by a composite tool post (1) via a bearing (5). The turret rotation axis (4) is connected to the rotation turret (2).
) A drive source (not shown) such as an electric motor or a hydraulic motor is connected to one end located on the opposite side, and the rotation drive is driven by the rotational driving force supplied from the drive source. The turret rotation shaft (4) has a hollow part (6) formed at its axis, and a drive shaft (7) is rotatably fitted into the hollow part. That is, a drive gear (8) is fixed to the light end of the drive shaft (7) on the side of the rotating turret (2), and is always in mesh with the intermediate gears (10) and (10') in the rotating turret. A second drive source such as an electric motor or a hydraulic motor (not shown) is connected to the other end of the drive shaft rotatably supported by a bearing (9), and rotational drive supplied from the second drive source The drive shaft (7) is configured to rotate due to the force.

On the other hand, a plurality of driven gears (11), (11°) for tool rotation are rotatably mounted at predetermined intervals along the circumferential surface of the rotating turret (2), and the driven gears (1
1), (10) (11°) and the drive gear (8) is an intermediate gear (
10), (10”) are arranged.Intermediate gear (10”)
), (1G”) are the intermediate shafts (
12) and (12") so that they can rotate freely, but the flange (2B) and snap
The ring (39) forms an integral structure with the intermediate shafts (12), (12''), and is biased by the pressure spring (18) and the positioning pin (16) so that it can slide along its axial direction. Couplings (13) and (14) having meshing teeth (15) are attached to the opposing surfaces of the rotating turret (2) and the composite tool rest (1), and the meshing teeth (15) The positioning bin (16) forms a kind of clutch mechanism so that a tool positioning operation can be performed between the rotating turret (2) and the compound tool post (1) by engaging and disengaging the turret. the intermediate shaft (12);
It has a tip portion (17°) that sits in a fitting hole (17) drilled at the shaft end (12°), and the press part is supplied with pressure oil from an external pressure oil source. It forms two oil chambers (40) and (41) into which oil flows (11). By switching the pressure oil flow path (not shown) into the oil chamber, the positioning pin (16) slides left and right along its axial direction, and the positioning pin (16) slides between the fitting hole (17) and the tip portion (17').
) is configured so that a fitted state and a disengaged state can be generated between the two.

The operating procedure of the apparatus of the present invention will be explained below. In order to rotate the turning turret (2) and move the desired rotary tool (3), (3') or turning tool to a predetermined cutting position, first,
The turret rotation axis (4), that is, the rotation turret (2) is linearly moved in the left direction in Fig. 6 relative to the compound tool post (1) using a turret rotation axis drive device (not shown) such as a hydraulic cylinder mechanism, for example. and Kampling (13) and (1
4) Disengage the meshing teeth (15). At the same time, the oil chamber (4
Pressure oil is introduced into the tip (16) of the positioning bottle (16).
17°) from the insertion hole (17) to create a state in which the turning turret (2) can freely rotate, and then turn on the first drive source to turn the turning turret (2). Axis (4
). At this time, at the same time as the positioning bin (16) is pulled out, the intermediate shaft (12) or (12') is biased by the pressure spring (18), and the position shown in FIG.
2”). In this way, the intermediate gear (1
0) or (10') and driven gear (11) or (
11°) becomes disengaged. Rotary tools (3), (3″) are placed at predetermined cutting positions under the control of a known numerical control device.
Alternatively, when the turning tool reaches the turning tool, the rotation of the turning turret (2) is stopped, and at the same time, pressure oil is introduced into the other oil chamber (41) to insert the tip (17') of the positioning bottle (16) into the fitting hole ( 17), and determine the stopping position of the rotating turret (2). At the same time, the turret rotation shaft drive device is activated to move the turret rotation shaft (4) linearly to the right in FIG.
The meshing teeth (15) of 13) and (14) are engaged to firmly fix the rotating turret (2) to the composite tool rest (1). If the tool is a rotating tool (3) or (3') (13), when the intermediate gear is in the position indicated by the reference number (10") in Figure 6, the drive gear (8) is used to rotate the tool. Since no rotational driving force is transmitted to the driven gear (11'), the rotary tool (3') does not rotate.On the other hand, since the positioning bin (16) is provided only at the cutting position, the positioning bin (16) The tip (17°) of the pressure spring (
The intermediate shaft (18) enters the insertion hole (17) provided at the shaft end of the intermediate shaft (12) against the pressing force of the intermediate shaft (18) and is in the cutting position.
12) to the left, the intermediate gear (10) meshes with the drive gear (8) and the driven gear for tool rotation (11) at the same time, allowing the rotary tool (3) in the cutting position to rotate. create. Thereafter, by activating the second drive source, the rotary tool (3) starts rotating, and the workpiece can be cut.

In addition, in the embodiment shown in FIG. 6, the positioning bin (
16) directly presses the intermediate shaft (12) or (12') to cause the intermediate gear (10) or (10') to slide along its axial direction, but as another method (14), method 7 As shown in the figure, the intermediate shaft (12) is fixed at a fixed position, and only the intermediate gear (10) is connected to the shifter (19).
may be moved along the axial direction of the intermediate shaft (2).

E. 2 Effects of the Invention It is clear from the above explanation that the device of the present invention has a rotating drive mechanism which is housed inside the compound tool rest and the rotating turret, and protrudes outside of the compound tool post. Since there is no such thing, it is possible to completely eliminate interference with Shinshindai. Furthermore, since the drive shaft passes through the center of the turret rotation axis, connection between the rotary tool drive mechanism and the drive source is easy. Furthermore, in the device of the present invention, the sliding motion for meshing of the intermediate gear is directly connected to the insertion motion of the positioning pin.
The overall structure of the rotary tool drive mechanism is greatly simplified. That is, the present invention not only contributes to improving the operability of the composite tool rest of a numerically controlled lathe, but also has a remarkable effect on reducing production costs due to structural simplification and facilitating maintenance management. It is.

(15)

[Brief explanation of drawings]

1 to 5 are two-view diagrams illustrating the structure of a conventional composite tool rest for a numerically controlled lathe. Further, FIGS. 6 and 7 are partially cutaway views illustrating the apparatus of the present invention. (3), (3') Single rotation tool, (1) - Compound tool post,
(4) - Turret rotation axis, (7) - Drive shaft, (2) - Swivel turret I~, (8) - Drive gear, (11), (11"
) - driven gear for tool rotation, (10), (10')
- Intermediate gear, (12), (12') - Intermediate shaft, (16
) - positioning pin, (17) - insertion hole for the tip of the positioning pin. (16) 1■ Figure 7

Claims (2)

[Claims] (1) In a composite tool rest of a numerically controlled lathe equipped with a rotary tool and a turning tool, there is a drive shaft that passes through a hollow turret rotation shaft, and a drive shaft that is fixed to the tip of the drive shaft inside the rotation turret. a driving gear; a driven gear for rotating a tool rotatably mounted along the circumferential surface of the turning turret;
An intermediate gear that is slidably supported along the axial direction between the drive gear and the driven gear for tool rotation forms a power transmission path that transmits rotational driving force only to the rotary tool in the turning position. A composite turret for numerically controlled lathes featuring the following features: (2) A shifter for axial movement is attached to the intermediate gear, or a hole for fitting the tip of the positioning pin is bored on the axis of the intermediate shaft that rotatably supports the intermediate gear, and the tip of the positioning pin is fitted. (1) After the turning turret has rotated, the intermediate gear is slid along the axial direction by utilizing the fitting of the tip of the positioning pin into the fitting hole; A composite cutter for a numerically controlled lathe according to claim 1, wherein a power transmission path is formed between the driving gear, the intermediate gear, and the driven gear to transmit rotational driving force only to the rotating tool in the turning position. The stand.