Cutter holder for composite lathe

Abstract

To provide a cutter holder for a composite lathe, which can prevent a distance from a reference position to a workpiece machining position from being increased even when the number of tool holders increases to enlarge the maximum swinging diameter of a turret.SOLUTION: A turret 2 is formed into a windmill form in which an axis of each tool holder TA, TB, TC, TD, TE does not pass through the turning center O of the turret 2. A tool rotation unit 3 includes a main tool rotary shaft 4 having an axis 4a which passes through the turning center O of the turret 2 above a workpiece machining position C and an offset tool rotary shaft 5 having an axis 5a offset with respect to the axis 4a of the main tool rotary shaft 4 and disposed at the workpiece machining position C to be driven by the main tool rotary shaft 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a tool rest for a composite lathe. [Background technology]

[0002] A known tool rest used in a multi-purpose lathe, which sequentially machines a workpiece placed at a workpiece machining position with various tools, is equipped with a turret that holds and rotates multiple tool holders, and a tool rotation axis (tool rotation unit) that rotates the required tool holder indexed to the workpiece machining position (Patent Document 1).

[0003] FIGS. 3(a) and 3(b) show examples of conventional tool rests (21) and (31) for a combined lathe.

[0004] In the tool rests (21) and (31) for the combined lathe shown in Figures 3(a) and (b), the workpiece machining positions (C1) and (C2) are set to be located on a line passing through the rotation center (O) of the turrets (22) and (32), and the turrets (22) and (32) are formed so that the axis of each tool holder (TA), (TB), (TC), (TD), and (TE) passes through the rotation center (O) of the turrets (22) and (32). The axes (23a) and (33a) of the tool rotation shafts (23) and (33) that rotate the tool (Ta) held in the tool holder (TA) are set to coincide with the workpiece machining positions (C1) and (C2) (on a line passing through the rotation center (O) of the turrets (22) and (32)).

[0005] Bevel gears (24), (34) are provided at the base ends of the tool rotation shafts (23), (33) for rotating the tool rotation shafts (23), (33) by a motor (not shown), and the tip ends of the tool rotation shafts (23), (33) are connected via connecting portions (25), (35) to required tool holders (TA) indexed to workpiece machining positions (C1), (C2). As a result, the tool rotation shafts (23) and (33) rotate, and the workpiece (not shown) at the workpiece machining positions (C1) and (C2) is machined by the tool (Ta) held in the required tool holder (TA).

[0006] In the tool rest (21) shown in FIG. 3(a), the turret (22) is configured to be able to hold 12 tool holders (TA) (TB) (TC) (TD) (TE), and in the tool rest (31) shown in FIG. 3(b), the turret (32) is configured to be able to hold 16 tool holders (TA) (TB) (TC) (TD) (TE).

[0007] In Fig. 3(a), E1 indicates the distance to the workpiece machining position (C1) when the tool rest movement guide is set as the reference position (S), and B1 indicates the maximum swing diameter of the turret (22). Also, in Fig. 3(b), E2 indicates the distance to the workpiece machining position (C2) when the tool rest movement guide is set as the reference position (S), and B2 indicates the maximum swing diameter of the turret (32).

[0008] According to Figures 3(a) and 3(b), if the tool rest (21) having a turret capable of holding 12 tool holders (TA), (TB), (TC), (TD), and (TE) shown in Figure 3(a) is changed to the tool rest (31) having a turret capable of holding 16 tool holders (TA), (TB), (TC), (TD), and (TE) shown in Figure 3(b), the maximum swing diameter of the turrets (22) and (32) increases from B1 to B2, and accordingly the distance from the reference position (S) to the workpiece machining positions (C1) and (C2) increases from E1 to E2. If the distance from the reference position (S) to the workpiece machining positions (C1) and (C2) increases, not only the tool rests (21) and (31) but also the headstock (not shown), which is another component of the combined lathe, and the device provided in conjunction with the headstock, will become larger, which creates a problem of the combined lathe becoming larger. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2009-279736 A Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been made in consideration of the above-mentioned problems associated with the conventional technology, and has as its object to provide a tool rest for a combined lathe which prevents the distance from the reference position to the workpiece machining position from becoming large even when the number of tool holders is increased and the maximum swing diameter of the turret becomes large. [Means for solving the problem]

[0011] The tool post for a combined lathe of the present invention is equipped with a turret that rotates while holding a plurality of tool holders, and a tool rotation unit that rotates a required tool holder indexed to a workpiece machining position, wherein the turret is shaped like a windmill such that the axis of each tool holder does not pass through the rotation center of the turret, and the tool rotation unit has a main tool rotation shaft that is located above the workpiece machining position and has an axis that passes through the rotation center of the turret, and an offset tool rotation shaft that is disposed at the workpiece machining position and has an axis that is offset with respect to the axis of the main tool rotation shaft and is driven by the main tool rotation shaft.

[0012] In the tool rest for a combined lathe of the present invention, the main tool rotation shaft is rotated by, for example, a motor in correspondence with a conventional tool rotation shaft, and the connection structure that conventionally connects the tool rotation shaft and the tool holder is provided between the offset tool rotation shaft and the tool holder. When the main tool rotation shaft is rotated, the offset tool rotation shaft rotates, and accordingly, a required tool holder located at the work position is rotated.

[0013] According to the tool rest for a combined lathe of this invention, the addition of an offset tool rotation axis makes it possible to reduce the distance from the reference position to the workpiece machining position by the offset amount, so that even if the number of tool holders increases and the maximum swing diameter of the turret becomes larger, the distance from the reference position to the workpiece machining position can be prevented from becoming large.

[0014] In order to enable the offset tool rotation shaft to be driven by the main tool rotation shaft, for example, the main tool rotation shaft can be rotated by a motor in the same manner as a conventional tool rotation shaft, and spur gears that mesh with each other can be provided on the outer periphery of the main tool rotation shaft and the outer periphery of the offset tool rotation shaft. Effect of the Invention

[0015] According to the tool post for the combined lathe of this invention, when the number of tools that can be attached to the turret is increased, the maximum swing diameter of the tool post increases; however, by adding an offset tool rotation axis, the distance from the reference position to the workpiece machining position can be prevented from becoming large, thereby preventing the combined lathe from becoming large. [Brief description of the drawings]

[0016] [Figure 1] 1 is a front view showing an embodiment of a tool rest for a composite lathe according to the present invention. FIG. [Diagram 2] FIG. 2 is an enlarged front view of a main part of FIG. [Diagram 3] FIG. 1 is a front view showing a conventional tool rest for a composite lathe, where (a) shows an example in which there are 12 tool holders, and (b) shows an example in which there are 16 tool holders. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0018] As shown in FIG. 1, the tool rest (1) for a composite lathe includes a turret (2) that holds and rotates multiple (16 shown) tool holders (TA), (TB), (TC), (TD), and (TE), and a tool rotation unit (3) that rotates the required tool holder (TA).

[0019] A headstock (not shown) is opposed to the tool rest (1), and a number of tool holders (X rotary tool holder (TA), a first external tool holder (TB), a Z rotary tool holder (TC), a second external tool holder (TD) and an internal tool holder (TE)) are sequentially indexed to the workpiece machining position (C) and then rotated, allowing various machining operations to be performed on the workpiece held on the headstock using tools (X rotary tool (Ta), a first external tool (Tb), a Z rotary tool (Tc), a second external tool (Td)) and an internal tool (Te)).

[0020] The turret (2) has a windmill shape in which the axis of each tool holder (TA), (TB), (TC), (TD), and (TE) does not pass through the rotation center (O) of the turret (2), as opposed to the conventional radial shape (in which the axis of each tool holder (TA), (TB), (TC), (TD), and (TE) passes through the rotation center (O) of the turret (22), (32).

[0021] The tool rotation unit (3) has a main tool rotation shaft (4) whose axis (4a) is located above the workpiece machining position (C) and passes through the rotation center (O) of the turret (2), and an offset tool rotation shaft (5) which has an axis (5a) offset relative to the axis (4a) of the main tool rotation shaft (4) (positioned below and parallel to each other), is disposed at the workpiece machining position (C), and is driven by the main tool rotation shaft (4).

[0022] The main tool rotation shaft (4) corresponds to the conventional tool rotation shaft (23) (33), and a bevel gear (6) is provided at its base end (the end closer to the rotation center (O) of the turret (2)) for rotating the main tool rotation shaft (4) by a motor (not shown).

[0023] As shown enlarged in Fig. 2, the main tool rotation shaft (4) is provided with a flange portion (7), and a spur gear (8) is formed on the outer periphery of this flange portion (7). The offset tool rotation shaft (5) is provided with a flange portion (9) at a position corresponding to the flange portion (7) of the main tool rotation shaft (4), and a spur gear (10) that meshes with the spur gear (8) of the main tool rotation shaft (4) is formed on the outer periphery of this flange portion (9). As a result, when the main tool rotation shaft (4) is rotated by the motor, the offset tool rotation shaft (5) is rotated in response to this.

[0024] The offset tool rotation shaft (5) has the same function as the conventional tool rotation shaft (23), (33) which rotates the tool (Ta) held in the tool holder (TA) at the workpiece machining positions (C1), (C2). At the workpiece machining position (C), the tool holder (TA) and the offset tool rotation shaft (5) are connected via a connecting part (11) so that they can rotate together. As a result, the offset tool rotation shaft (5) rotates in conjunction with the rotation of the main tool rotation shaft (4), and as a result, the tool (Ta) held in the tool holder (TA) rotates to perform the required machining.

[0025] The main tool rotation shaft (4) and the offset tool rotation shaft (5) are immovable in the axial direction and are only rotatable, and the connecting portion (11) is formed by a groove (12) provided in the offset tool rotation shaft (5) and a protrusion (13) provided in the tool holder (TA), as shown in FIG. 2.

[0026] In Fig. 1, E indicates the distance from the tool rest movement guide to the workpiece machining position (C) as the reference position (S), and B indicates the maximum swing diameter of the turret (2). Comparing Fig. 1 and Fig. 3(b), they are the same in that the turrets (2) (32) are formed to be able to hold 16 tool holders (TA, TB, TC, TD, TE), and therefore the maximum swing diameter B of the turret (2) in Fig. 1 is the same as the maximum swing diameter B2 of the turret (32) in Fig. 3(b). However, as for the distance from the reference position (S) to the workpiece machining position (C) (C2), E in Fig. 1 is smaller than E2 in Fig. 3(b) by the offset amount of the offset tool rotation axis (5), and is the same as E1 in Fig. 3(a).

[0027] That is, according to the tool rest (1) for a multi-purpose lathe of the above embodiment, when the number of tool holders (TA), (TB), (TC), (TD), and (TE) is increased based on the tool rest (21) shown in Fig. 3(a), the distance E from the reference position (S) to the workpiece machining position (C2) does not increase, whereas in the past, the distance E2 from the reference position (S) to the workpiece machining position (C2) increases as shown in Fig. 3(b). If the distance E from the reference position (S) to the workpiece machining position (C) increases, the headstock, which is another component of the multi-purpose lathe, and the device provided in accordance with the headstock also become larger, which causes a problem that the entire multi-purpose lathe becomes larger. However, according to the above embodiment, it is possible to prevent this distance E from increasing, thereby preventing the multi-purpose lathe from becoming larger.

[0028] In the above embodiment, the connecting portion (11) is formed by the concave groove (12) provided in the offset tool rotation shaft (5) and the convex portion (13) provided in the tool holder (TA). However, the connecting structure for rotating the offset tool rotation shaft (5) and the tool holder (TA) together is not limited to this. [Explanation of symbols]

[0029] (1): Tool holder (2): Turret (3): Tool rotation unit (4): Main tool rotation axis (4a): Axis line (5): Offset tool rotation axis (5a): Axis line (TA)(TB)(TC)(TD)(TE): Tool holder (Ta):Tool (O): Turret rotation center (C): Workpiece machining position

Claims

[Claim 1] A tool rest for a composite lathe including a turret that holds and turns a plurality of tool holders, and a tool rotation unit that rotates a required tool holder indexed to a workpiece machining position, The turret is formed in a windmill shape such that the axis of each tool holder does not pass through the rotation center of the turret, said tool rotation unit comprises a main tool rotation axis located above said workpiece machining position and having an axis passing through the rotation center of said turret, and an offset tool rotation axis located at said workpiece machining position, having an axis offset with respect to the axis of said main tool rotation axis, and being driven by said main tool rotation axis.

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