JPH0241806A - Clamp mechanism for non-lift swivel structure - Google Patents

Abstract

PURPOSE:To unify a clamping force by detecting an engaging force of a coupling moved by a cylinder device with respective couplings on a tool box side and on a turret side by means of a sensor to give a displacing member voltage compensating the difference of the clamping force. CONSTITUTION:Pressure oil is sent to a side house 6a of a cylinder 6 to lower a piston rod 8, so that the clutch face 9a of a coupling 9 is engaged simultaneously with the clutch face 10a of a coupling 10 provided on a turret 3 and the clutch face 11a of a coupling 11 provided on a tool box body 1 to clamp the turret 3. A clamping pressure is transmitted to piezoelectric elements 12b, 13b and not operated uniformly by the errors of the respective clutch faces to measure the output voltages of the piezoelectric elements 12b, 13b for calculating surplus or shortage to an average output voltage. Then, the surplus or shortage in not less than a preset value causes voltages applied to corresponding piezoelectric displacing elements 12a, 13a respectively to be calculated and applied.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a ramp mechanism which is suitable for use as a member for rotating and indexing a rotating body on which a heavy object such as a Klett tool rest of a machine tool is placed.

Conventional Techniques When the T& machine becomes large in size, the turret tool post is also large and heavy tools are used to withstand heavy cutting, making the turret heavy and making it impossible to increase the indexing speed. Furthermore, when increasing speed, it is necessary to make moving members as light as possible. Therefore, instead of lifting the turret and unclamping it, a coupling attached to the back side of the turret and a coupling attached to the turret body are arranged concentrically, and a coupling that meshes with both couplings is engaged. A non-lift type is used, which eliminates the need to lift the turret.

Problems to be Solved by the Invention Many of the couplings used are of the type generally referred to as curvic gears. This coupling has also been manufactured with high precision due to improved precision of machine tools, but it is still subject to manufacturing errors such as uneven thickness of the coupling body, two-tooth thickness, tooth profile, parallelism of tooth surfaces, and distortion during meshing. It is difficult to mesh the three couplings uniformly and accurately.

Therefore, there was a problem in that the clamping became uncertain, which affected the accuracy of indexing the turret and the accuracy of machining.

The present invention has been made in light of these problems of the prior art, and is intended to provide a clamp mechanism that allows uniform engagement over the entire clutch surface.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention combines a sensor member that detects clamp pressure and a displacement member that changes the thickness by external energy on the back side of the first coupling on the turret side. The first adjusters of the matched segments are arranged in a repeating manner, and the first adjusters are also arranged on the back side of the second coupling on the turret main body side.
When the same number or almost the same number of second adjusters as the adjusters are arranged and clamped by the third coupling, the first. and a control device that detects the difference in clamping force of each part from the output of the sensor member of the second adjuster and, based on this value, displaces the displacement member so as to compensate for the difference in clamping force of each part. It is.

When the working turret is indexed, the third coupling is moved by a cylinder device and the first. This meshing force that meshes with the second coupling is detected by the sensor member of each regulator, and based on the output, the control device applies a voltage to the displacement member to compensate for excess or deficiency in the difference in clamping force, changing the thickness of the displacement member. This makes the clamping force uniform.

Example An embodiment will be described based on FIGS. 1 to 4.

A pivot shaft 2 is rotatably supported at the center of the tool rest main body 1 by a bearing. A turret 3 for taking a large number of tools is fixed to the upper end of the pivot shaft 2, and a gear 4 is fixed to the lower end. The turret 3 is rotated and indexed by a gear 5 rotated by an indexing drive source (not shown).

The turret main body 1 has an annular cylinder 6 centered on the rotation axis 2.
is formed, and a donut-shaped piston 7 is fitted therein. A hollow piston rod 8 is integrally attached to the center of the piston 7, and is rotatable and axially movable relative to the pivot shaft 2, but is prevented from rotating.

A coupling 9 is fixed to the upper end of the piston rod 8 and is housed under the turret 3. The coupling 9 has a long gear-shaped clutch surface 9a cut radially from its lower surface. A coupling 10, which is a droop/throat example, and a coupling 11 on the tool rest main body side, which are integrally engaged with this coupling 9, are provided. The coupling 10 on the turret side has a gear-shaped clutch surface 1 on the upper surface of a disk fixed to the outer peripheral sleeve of the turret 3.
0a is cut radially to a length that engages approximately 1/2 of the outer peripheral side of the clutch surface 9a. Similarly, the coupling If on the turret main body side has a gear-shaped clutch surface 11a cut radially on the upper surface to a length that meshes with about 1/2 of the inner peripheral side of the clutch surface 9a. It goes without saying that the gear-shaped clutch surfaces 9a, lOa, and lla of the couplings 9, 10, and 11 are formed to have the same pitch and the same shape so that they can be brought into close contact with each other.

Between the coupling 10 and the turret main body 1 is a segment n fixed to the turret main body 1 and arranged concentrically.
The adjuster 12 is equipped with a piezoelectric displacement element 12a that extends in proportion to the voltage when the turret main body 1 side applies a DC voltage, and a piezoelectric displacement element 12a that extends in proportion to the voltage on the upper surface coupling side of the piezoelectric displacement element 12a. Piezoelectric elements 12b serving as sensors that output voltage are formed in sets. The piezoelectric displacement element 12a and the piezoelectric element 12b may be upside down. Since the coupling 10 is rotated together with the turret, there is a slight gap between it and the adjuster 12. To eliminate this gap when clamping, a large number of piezoelectric displacement elements are assembled to obtain the necessary displacement. Sometimes they are combined.

n or almost n similar adjusters 13 are also interposed between the coupling 11 and the tool rest main body l. The piezoelectric elements 12b and 13b serving as sensors are pressure...Sk DC output voltage...Esk constant...C1
A device that outputs a voltage of S k =CI-E s k is used.

In addition, the piezoelectric displacement elements 12a and 13a have displacement...Ak DC applied voltage...■Ak constant...C
2, a displacement of Ak=C,·VAk is used.

A first control device 21 inputs the output of a piezoelectric element serving as a sensor and performs necessary calculations. Is 22 the second system? The device No. 11 outputs a voltage for displacing the piezoelectric displacement element based on the output of the first control device. Note that the first control device and the second control device can be integrally formed.

In FIG. 5, which shows a flowchart, it is assumed that the turret 3 of the tool rest is rotated and indexed, and a positioning clamp operation command is issued. In step S1, the unclamping side chamber 6b of the cylinder 6 of the tool rest main body l is connected to the discharge side, and when pressure oil is sent to the clamping side chamber 6a, the piston 7 is lowered together with the piston rod 8. When the piston rod 8 is lowered, the coupling 9 is moved in the meshing direction, and the clutch surface 9a of the coupling 9 is fixed to the clutch 3.
The clutch 3 engages simultaneously with the clutch surface 10a of the turret body 1 and the clutch surface 11a of the coupling 11 fixed to the turret main body 1.
is clamped.

The clamping pressure is transmitted to each regulator 12.13 of the segment. Each clutch surface has an adjuster 1 for all segments due to pitch errors, shape errors, parallel errors, mounting distortions, etc. during manufacturing.
2.13 The pressure is not applied uniformly and there is some strength and weakness. Therefore, in step S2, first, the output voltage Esk at the piezoelectric element 12b of the sensor of each regulator 12 is measured, and the control device 2
Enter 1. In step S3, the control device 21 calculates the average output voltage Esk=
Σ(, IEsk/n is calculated. In step S4, the control device 21 determines whether the output voltage of each segment 12 is excessive or insufficient.
Calculate ΔEsk=Esk−Esk. Step S5
In step S6, the control device 21 determines whether the variation in excess or deficiency in the output voltage is less than or equal to the set value ε%, and if NO, in step S6, the control device 22 takes action based on the calculated value ΔEsk of excess or deficiency in the output voltage. The voltage ΔVak=ΔE S k X (C+/C2) to be applied to the piezoelectric displacement element 12a of each regulator 12 is calculated. In step S7, the control device 22 changes the voltage applied to the piezoelectric displacement element 12a of each regulator 12 to a calculated value. The pressure received by the piezoelectric element 12b of the sensor is changed by expanding and contracting the thickness of the piezoelectric displacement element due to this change in applied voltage. Thereafter, the process returns to step S2 and confirmation is performed in the same steps. If YES in step S5, step S
In step S8, it is determined whether the adjustment of the adjuster 13 is completed, and if NO, the process moves to step S2 and the adjustment of the adjuster 13 is performed in the same manner. If YES, machining begins after the clamping force adjustment is completed, and when the next turret indexing command is output, the clamp side chamber 6a of the cylinder 6 becomes the oil drain side, and pressure oil is sent to the unclamp side chamber 6b, and the piston 7, The piston rod 8 rises and the clutch surface 9a of the coupling 9 contacts the coupling 10.11.
The turret 3 becomes unclamped as it comes off from the clutch surfaces 10a and lla. The gears are rotated by a motor (not shown),
Gear 4. The cret is rotated and indexed by a predetermined angle on the rotation axis 8. Then, the above-mentioned clamping force adjustment operation is started in response to a clamp command.

Effects Since the present invention is constructed as described above, the following effects are achieved.

The coupling of the clutch, the force of the turret body, and the engagement force of the clutch surface at each part of the 7-pull are uniform and reliable, enabling ramping and completely eliminating errors caused by uneven engagement force. Can be done.

[Brief explanation of the drawing]

Figure 1 is an explanatory longitudinal cross-sectional view of part of the related parts of the turret tool rest, Figure 2 is a layout diagram of the adjuster made into segments, Figure 3 is an explanatory cross-sectional view of the adjuster, and Figure 4 is an explanatory view of the adjuster. The control diagram, FIG. 5, is a diagram showing the adjustment procedure of the adjuster. L...Turret main body 2...Swivel shaft 6...Cylinder 7...Piston 8...Piston rond 9.10.11...Couplings 9a, 10a, 1la--Crack/notch surface 12.13...
Adjusters 12a, 13a...Piezoelectric displacement elements 12b, 13b...Piezoelectric elements of the sensor

Claims (1)

[Claims] (1) The first coupling (10
) and a third coupling (9) that is simultaneously engageable and detachable from a second coupling (11) provided on the main body (1) side, in which the first coupling (
There is a sensor member (12) on the back side of the sensor member (10) that detects the clamp pressure.
b) and a displacement member (12a) whose thickness is changed by external energy.
2), and a second regulator (1) same as the first regulator (12) is arranged on the back side of the second coupling (11).
3) are arranged in the same number or almost the same number, and the first and second
Sensor members (12b, 13b) of regulators (12, 13)
A control device (21) that detects the difference in clamping force of each part from the output of
, 22), and uniformly adjusts clutch surface pressure.