JPS6219336A - Clamping structure for turret table in machine tool - Google Patents

Abstract

PURPOSE:To make simplification and compactification in structure promotable as well as table clamping securable, by installing plural cylinder chambers in the annular clamp plates tightly attached to a base frame, and inserting a cylinder, free of pressure contact with a flange part, into one of the cylinders. CONSTITUTION:A hydraulic motor 132 is driven so as to cause a desired tool 23 to adjoin a machining position, and a turret table 21 is indexed and rotated via an arm 151, a connecting pin 155 and a connecting hole 107. Next, the desired tool 23 is indexed and, after being rotated, a positioning pin 113 is engaged with a notch part 111 by a positioning cylinder 112, while a joint member 81 is connected to a bracket 74 by a coolant feed cylinder 52. then, the connecting pin 155 is pulled out of the connecting hole 107 by a connecting cylinder 152, and a flange part 109 is pressed and locked to a support surface 41 by a clamp cylinder 211 via a piston 214, connecting a clutch rod 66 to an input shaft 102 by a clutch operating cylinder 52, and the tool 23 is rotated by a motor 51, thus a work is machined.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a clamp structure for a turret table in a machine tool.

(Prior Art) A base frame having an annular support surface formed at an angle with respect to a horizontal plane; and a base frame rotatably assembled to the base frame through the annular support surface about the center of the annular support surface. A machine tool is equipped with a turret table having a plurality of tools attached to its outer circumference at intervals in the circumferential direction, and an indexing rotation mechanism that indexes and rotates the turret table. Thereafter, clamping means are provided for securing the turret table to the base frame so as to prevent rotation of the turret table.

The fixing of such a turret table was previously disclosed in Japanese Patent Application Laid-open No. 58-1.
As disclosed in Japanese Patent No. 96904, a plurality of clamp cylinders are erected on the annular support surface side of the base frame,
A locking member is attached to a piston rod projecting upward from a clamp cylinder, and the turret table is drawn toward an annular support surface through the piston rod and the locking member by the operation of the clamp cylinder, and brought into pressure contact with the support surface. This is done by

(Problems to be Solved by the Invention) Therefore, the structure of the conventional clamping means is complicated, and space must be secured for arranging the piston rod of the clamp cylinder, the locking member attached to the piston rod, etc. This resulted in problems such as the clamp structure becoming larger and the machine tool becoming larger.

The present invention has been devised in view of the above-mentioned circumstances, and one object of the present invention is to provide a turret table in a machine tool that can simplify and downsize the structure and further securely fix the turret table. to provide a clamp structure.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a turret table (
21) is provided with a flange portion (to9) that protrudes radially outward and is slidable on the annular support surface (41), and an annular clamp plate that faces the upper surface of the flange portion (109) on the base frame (5). (202) is fixedly installed, and the clamp plate (202) is fixedly installed.
A plurality of downwardly open cylinder chambers (212) are formed at intervals in the circumferential direction in the cylinder chamber (212).
12) is characterized in that a piston (210) that can be press-fitted to the clamp portion (109) is fitted therein.

(Function) The pistons (210) fitted in each cylinder chamber (212) of the clamp plate (202) are brought into direct pressure contact with the flange portion (109) to fix the turret table (21), so the turret The piston rod and locking member for fixing the table can be eliminated, and the structure can be simplified and made more compact.

In addition, since the piston (214) is pressed against the flange (109) and the flange (109) is clamped and fixed between the piston (214) and the support surface (41), the turret table (21) is securely fixed. can do.

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a machine tool equipped with a turret device according to the present invention, and FIG. 2 is a sectional view of essential parts of the turret device.

(1) is the base, (2) is the vertical feed table, (3) is the horizontal feed table, and the base frame (5) is fixed on the cross feed table (3).
A turret device (8) is provided via the base frame (5), and the turret device ff1 (
6) in the vertical direction together with the vertical feed table (2), and the turret device (8) and the cross feed table (3) are moved by the horizontal feed motor (8).
), and (11) and (12) in the figure indicate the guide blocks of the vertical feed table (2) and the horizontal feed table (3), respectively.

A table (15) is provided on the base (1) facing the turret device (8), a jig stand (1B) is fixed to the table (15), and a pallet (not shown) with a workpiece attached thereto is installed.
(17) is fixed to the jig stand (16).

As shown in FIG. 2, the turret device (6) is equipped with a turret table (21) rotatably attached to a base frame (5), and the turret table (21) is provided with intervals in the circumferential direction. multiple turret heads (22
) and attach the tool (23) to each turret head (22).
Attach the tool head (24) with the attached tool head (24).

The turret table (21) has an index rotation mechanism (31).
) and its drive unit (32) to rotate the desired tool (
23) is indexed to a machining position N (a) facing the workpiece side, and at this machining position (a), the turret table (21) is positioned by the positioning mechanism (30), and the clamping mechanism (35)
Fixed by

Then, at the machining position (a), the cutting oil supply mechanism (37)
is connected to the turret head (22) to supply oil to the machining location, and machining power is transmitted to the tool (23) via the clutch mechanism (38), so that the tool (23) machining the workpiece.

Next, each member and mechanism will be explained.

On the processing position (A) side of the base frame (5), an annular support surface (41) is formed which is inclined diagonally upward at 45 degrees with respect to the horizontal plane, and an annular protrusion is formed from the inner peripheral side of the support surface (41). A portion (42) is formed.

A hollow support (43) is fixed to the protrusion (42) via a bolt (40) with its axis perpendicular to the support surface (41), and a spindle is installed inside the base frame (5). (45) is rotatably provided via bearings (4B) and (48).

A motor (5) for driving a spindle (45) is installed on the wall of the base frame (5) opposite to the processing position (A).
1) and a hydraulic clutch actuation cylinder (52).

The output shaft (53) of the motor (51) and the spindle (4)
5) through gears (54) and (55).

The clutch actuating cylinder (52) is arranged with its axis parallel to the axis of the spindle (45), and forms a bifurcated arm with the support shaft (82) as a fulcrum by the forward and backward movement of the piston rod (61). (63) is swung.

The spindle (45) is provided with a hollow clutch rod (66) that rotates together with the spindle (45) via a key (65), and a roller (88) is attached to the flange (67) of the clutch rod (68). , (88) to engage the arm (63), and the swinging of the arm (83) causes the clutch rod (66) to slide on the spindle (45).

The clutch rod (86) has a coil spring (71
) to force the clutch actuating cylinder (
52), arm (83), clutch rod (ee).

A clutch mechanism (38) is composed of a spring (71) and the like.

As shown in Fig. 3, a bracket (70) having an oil passage (73) is installed vertically on the turret head (22), and a bracket (70) having an oil passage (73) is installed on the turret head (22). A hydraulic cutting oil supply cylinder (76) is arranged facing the bracket (74) of the -2 door (22).

The cutting oil supply cylinder (7B) has a casing (77)
A piston rod (78) is slidably fitted into the piston rod (78), and a shut bin (78) protrudes from the casing (77).
Please note that the piston rod (78) has a joint member (
81).

The joint member (81) is a flexible tube (
The outlet port (85) is connected to the oil passage (73) of the bracket (74) when the piston rod (78) is extended.
2) Supply cutting oil to the side and shut off the oil passage (83) with the shut pin (79) when the piston rod (78) is contracted;
The supply of oil to the turret head (22) side is stopped, and the cutting oil supply cylinder (78) and the joint member (81
) etc. constitute a cutting oil supply mechanism (37).

The turret table (21) has upper and lower inner peripheral parts (91).
, (92) are respectively attached to the outer periphery of the support column (43) and the base of the base frame projection (42) to bearings (93) and (94), respectively.
(95) in the figure is the bearing (S4
) shows the retaining plate.

A plurality of openings (101) are formed at intervals in the circumferential direction on the outer periphery of the turret table (21).

A turret head (22) is attached to each opening (101).

The tool head (24) has an input shaft (1) extending to the rear side.
02), and the input shaft (102) is connected to the clutch rod (B6) which is axially automatically moved via the arm (63) by the operation of the clutch actuation cylinder (52) and the spline (102).
03), and the spindle drive motor (51
) is transmitted to and cut off from the tool (23), and the proximity switch (1) is used to transmit and cut off the power to the tool (23).
04) and (105).

The upper inner circumference (91) of the turret table (21)
has a flange member (108) having a connecting hole (107).
is fixedly installed, and from the lower inner circumference (92) the support surface (4
1) A slidable annular flange portion (109) is formed in a protruding manner.

A plurality of central portions (111) are formed on the outer periphery of the flange portion (109) at intervals in the circumferential direction, and a hydraulic positioning cylinder (11
2) moves the positioning bin (113) to the central part (
ill) to position and release the turret table (21).

In the embodiment, the piston rod of the positioning cylinder (112) also serves as the positioning pin (113), and the protrusion (
111), a positioning cylinder (112), and the like constitute a positioning mechanism (34). .

The pillar (43) has an open space (131) diagonally upward.
), and a hydraulic motor (132) for indexing and rotating the turret table, which constitutes the drive unit (32), is connected to the space (131).
) and the casing (13) of the hydraulic motor (132).
3) The upper part fits into the fitting part (130) on the upper part of the wall defining the space (131).

The hydraulic motor (132) includes a rotating shaft (142) in which an oil passage (141) is formed, and a casing (133).
) The rotating shaft (142) protruding from the lower surface of the support column (4
3) into the base (143) of the
The oil passage (144) on the 3) side and the oil passage (141) are formed so as to be able to communicate with each other and to be disconnected from each other.

A rotating shaft (1) protruding from the upper surface of the casing (133).
42) is fixed with an arm (151) that rotates together with the rotating shaft (142).

A connecting cylinder (152) is attached to the tip of the arm (151).
) is provided, and the connecting cylinder (152) and the oil passage (141
) are connected to each other through an oil passage (153) formed in the arm (151), and the connecting pin (155) is engaged and disengaged from the connecting hole (107) by the operation of the connecting cylinder (152).

In the embodiment, the piston rod of the connecting cylinder (152) also serves as the connecting pin (155), and the arm (151)
) is detected by the proximity switch (15B),
The arm (151), the connecting cylinder (152), the connecting hole (107), etc. constitute an indexing rotation mechanism (31) that indexes and rotates the turret table (21), and (157) in the figure is the indexing rotation mechanism. (31) shows the cover.

An annular protrusion (201) is formed from the outer periphery of the support surface (41).
A clamp plate (2G2), which is an annular plate, is fixed to the protrusion (201) via a screw (203), so that the clamp plate (202) faces the upper surface of the flange (109). .

As shown in FIGS. 4 and 5, the clamp plate (202) has a plurality of clamp cylinders (
211).

The clamp cylinder (211) is connected to the clamp plate (202
) and a piston (210) fitted with an O-ring (213) fitted into the cylinder chamber (212), and a lower surface (214a) of the piston (214). is formed on the upper surface of the flange portion (109) so as to be press-contactable.

Then, by supplying pressure oil from the oil passage (221) to the cylinder chamber (212), the lower surface of the piston (214a) is brought into pressure contact with the upper surface of the flange portion (109), and the piston (210) and the support surface (
41) to clamp and fix the flange part (109), and connect the oil passage (221) to the oil tank side to release the clamping fixation of the flange part (109), and the clamp plate (202) ), a clamp cylinder (2t t), etc. constitute a clamp mechanism (35).

Next, to explain the case of machining a workpiece, the clutch rod (6B) is separated from the input shaft (102) by the operation of each cylinder (52), (7B), (152),
The joint member (81) is separated from the bracket (70), the i-connection pin (155) is engaged with the connecting hole (10?), and the oil passage (221) of the clamp cylinder (211) is
After communicating with the oil tank side, the positioning pin (113) is pulled out from the protrusion (111) by operation of the first positioning cylinder (112).

Next, the hydraulic motor (132) is driven so that the desired tool (23) faces the machining position (a), and the turret table (21) is moved through the arm (151), the connecting pin (155), and the connecting hole (107). Index and rotate.

Next, after indexing and rotating the desired tool (23) to the machining position (A), the positioning cylinder (112) is operated to engage the positioning pin (113) with the protrusion (111), and then the cutting oil is supplied. The operation of the cylinder (52) connects the joint member (81) to the bracket (74), and the operation of the connection cylinder (152) connects the joint member (81) to the connection bottle (15).
5) is pulled out from the connecting hole (107), the piston (214) presses and fixes the flange portion (109) to the support surface (41) by the operation of the clamp cylinder (211), and the flange part (109) is pressed and fixed to the support surface (41) by the operation of the clutch actuation cylinder (52). clutch rod (
66) to the input shaft (102), and the drive motor (5
The tool (23) is rotated by the power of step 1) to process the workpiece.

The present embodiment is constructed as described above, and a clamp plate (202) having a plurality of cylinder chambers (212) open downward is provided on the upper surface side of the flange portion (109), and each cylinder chamber (
Since the piston (210) fitted into the flange (212) is directly pressed against the flange (109) to fix the turret table (21), the piston rod and locking member required in the conventional clamp structure can be eliminated, and the clamp structure can be simplified and made more compact.

In addition, the piston (21) fitted in the cylinder chamber (212)
4) into pressure contact with the flange part (toe), and the piston (2)
Since the flange portion (109) is clamped and fixed between the support surface (41) and the support surface (41), the turret table (21) can be securely fixed.

(Effects of the Invention) As is clear from the above explanation, according to the clamp structure of the turret table according to the present invention, the clamp structure can be simplified and made compact, and furthermore, the turret table can be securely fixed. .

[Brief explanation of drawings]

Fig. 1 is a perspective view of a machine tool equipped with a turret device according to the present invention, Fig. 2 is a sectional view of main parts of the turret device, Fig. 3 is a sectional view of main parts of a cutting oil supply mechanism, and Fig. 4 is a clamp. An enlarged sectional view of the cylinder portion, FIG. 5 shows a sectional view corresponding to the v-v line in FIG. 2. In the drawing, (5) is the base frame, (21) is the turret table, (31) is the indexing rotation mechanism, (32) is the drive unit, (30 is the positioning mechanism, (35) is the clamp mechanism,
(37) is a cutting oil supply mechanism, (38) is a clutch mechanism,
(109) is a flange portion, (211) is a clamp cylinder, (212) is a cylinder chamber, and (214) is a piston.

Claims (1)

[Scope of Claims] A base frame having an annular support surface formed at an angle with respect to a horizontal plane; and a base frame rotatably assembled to the base frame about the center of the annular support surface via the annular support surface. A machine tool comprising: a turret table with a plurality of tools mounted on the outer periphery at intervals in the circumferential direction; and an indexing rotation mechanism for indexing and rotating the turret table. A flange portion protruding outward and slidable on the annular support surface is provided, an annular clamp plate facing the upper surface of the flange portion is fixed to the base frame, and a flange portion is provided with a flange portion extending downwardly at intervals in the circumferential direction. 1. A clamping structure for a turret table in a machine tool, characterized in that a plurality of open cylinder chambers are formed in the cylinder chamber, and a piston is fitted into each cylinder chamber so that the piston can be press-contacted to the flange portion.