JPS5866601A - Numerical control lathe with two main shafts and two saddles - Google Patents

Abstract

PURPOSE:To improve operational efficiency of cutting by providing each of two back-to-back slant heads composing a head with a headstock individually capable of sliding axially and determining its position and further providing on the top of the head, two tool rests which can independently slide and determine their positions in the cutting direction. CONSTITUTION:Slant heads 1a, 1b are combined back-to-back with each other so as to make tool rests 9a, 9b cut in the top of the head along its slant. Accordingly, the captioned machine has excellent approachability to a workpiece and not only is easy to maintain but also very efficient in discharging chips. Further, since the headstocks 4a, 4b are movable to a head edge 1, detachment of the workpiece may be easily performed and machining efficiency may be improved.

Description

[Detailed description of the invention] The present invention is a two-spindle, two-saddle numerical control (hereinafter referred to as NC)
Concerning improvements to lathes. Recently, as part of the improvement in the capabilities of NC lathes, a type of NC lathe with a plurality of main spindles and saddles installed on one bed has been seen. However, until now, it has been known that the two main shafts are arranged side by side on the same slant bed or are arranged horizontally, and the tool rest is arranged inwardly inclined, with a chip reservoir in the center. However, with this type of arrangement of the main shaft and saddle, there are difficulties in chip disposal and operability, and the machine is not yet well-developed.

Therefore, the present invention aims to provide a 2-spindle, 2-saddle NC lathe that has good chip disposal and good accessibility and operability for workers. The headstock is equipped with two turrets on the top of the bed, each of which can be slid and positioned independently in the cutting direction. .

Embodiments of the present invention will be described below based on the drawings. In Fig. 1 for so-called chuck work, reference numeral 1 denotes a slant bed 1a having a guide surface 2a in the longitudinal and horizontal direction.
The top 10, which is a bed in which a slant bed 1b having a guide surface 2b is placed back to back, is formed into a flat shape and is fixed on a leg 3. Since exactly the same parts are disposed on each of the slant beds 1a and 1b, the front parts are distinguished by a and the rear parts by b, and only the front parts will be described. 4a is a headstock that rotatably supports a main shaft 5a with a chuck 6a attached to its tip; a mounting table 7 that can slide on the guide surface 2a of the slant bed 1a;
a, is driven by a motor (not shown) and a feed screw (not shown), and is independently positioned in the Z-axis direction of the main shaft by a known NC device.
Reference numeral 8 denotes a chevron-shaped guide stand fixed to the top 1c of the bed 1, and has slopes parallel to the slant beds ia and ib, and the slope on the slant bed 1a side is used to cut into the workpiece gripped by the chuck 6a of the main shaft 5a. An X-axis direction guide surface 8a is provided. The same guide surface is also provided on the slope on the slant bed 1b side. Reference numeral 9a denotes a tool rest on which a turret 10a is indexed and rotatably supported. Cutting feed is applied to the workpiece by a feed screw (not shown) by a motor (not shown), and positioning is controlled independently by an NC device.

The workpiece is gripped by this chuck 6& and the turret 10a
The cutter is selected, and the headstock 5& and the tool rest 9a are each independently controlled by the NC to perform cutting.
The chips slide on the slope of the slant spatula 2a and the slope of the guide table 8 and accumulate on the upper surface of the leg 3. Cutting is similarly performed independently on the rear slant bed 2b.

Figure 2 shows an embodiment for so-called center work in which a tailstock is provided on the headstock, and the same parts as in Figure 1 are given the same numbers, and the front side is denoted by a and the rear side is denoted by b. omitted. The mounting table 7a of the headstock 4a is extended toward the side where the workpiece is gripped, and two T-grooves 11a parallel to the sliding direction are cut from the right end of the upper surface thereof.

Reference numeral 12a is a tailstock which is placed on the mounting table 7a with its axis aligned with the main spindle 5a, and is fixed with a bolt between it and a T-nut fitted in the T-slot 11a.
The distance between the tailstock 12a and the center 14a of the tailstock 12a is determined depending on the workpiece.

When a workpiece is gripped between the centers 13a, 14b, the tool in the turret) 10a is selected and the tool in the headstock 5a'i
The tool post 9a is independently controlled by NC to perform cutting. The chips fall down the slope of the guide table 8 and the slope of the slant bed 2a and accumulate on the legs 6. Rear slant bed 2
Cutting is also performed independently on b.

As described in detail above, according to the present invention, the slant beds are placed back to back, and the turret is cut into the top of the bed along the slope, making it easy to access the workpiece and easy to maintain. Processing is very good. In addition, the headstock can be moved to the end of the bed, making it easy to attach and detach the workpiece even when input is required.
Since it is easy to attach tools, etc., it is extremely flexible in adapting to automation, reducing idle time and improving processing efficiency.

Furthermore, the floor space can be reduced, making it economical.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a lathe for chuck work. FIG. 2 is a perspective view of a lathe for center work. 1... Beds 1a, 1b... Slant beds 4a, 4b... Headstock 8... Holding stands 9a, 9b... Tool rest

Claims (2)

[Claims] (1) A bed with back-to-back slant beds each having a first guide surface in the horizontal direction, and a main shaft that is provided so as to be independently slidable and positionable on the first guide surface of each bed and that supports the main shaft. a chevron-shaped guide stand having a second guide surface in the cutting direction for the workpiece gripped by each of the spindles on the back-to-back upper surface of the bed; A 2-spindle, 2-saddle numerically controlled lathe equipped with a sliding positioning turret. (2) The mounting table of the headstock is provided with a psychological table facing the spindle. tj, Wi A two-spindle, two-saddle numerically controlled lathe described in item 1.