JPH04336927A - Automatic leveling device for machine tool - Google Patents

Abstract

PURPOSE:To automate a leveling work for a machine tool by detecting a change in machine level, using a plurality of water containers communicated and connected with water tubes to suit the position of a leveling block, and a laser displacement gauge. CONSTITUTION:A power driven leveling block for a machine tool is laid under a machine bed 15. In addition, a plurality of water containers 10 are so provided as to correspond to the position of the leveling block. Also, the containers 10 are communicated and connected to each other via water tubes, and the water level 9 of the concerned container is measured with a laser displacement gauge 8. The measurement data is inputted to a computer 1 and a processed result is sent to a solenoid valve 4 with a control program 14. A hydraulic cylinder 50 is thereby actuated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic leveling device used for leveling a machine table or bed of an industrial machine tool.

0002

[Prior Art] Conventionally, there was no automatic leveling system like the present invention, so humans analyzed the data read from a scale using a bubble level or telescope placed on a machine table and adjusted the leveling block by hand. By doing this, the machine was leveled. In the long history of machine tools since the Industrial Revolution, it is rare that improvements have been made as much as this leveling process.

0003

[Problems to be Solved by the Invention] Some of the large profilers used to remove excess thickness from aircraft fuselage skins, etc., have over 300 leveling blocks, which cannot be done using the conventional manual leveling method. When leveling, it takes around 10 days for the leveling schedule to be repeated due to trial and error with the same leveling block, and in addition, the parts adjusted at the first face may go awry due to changes in the environment and surrounding conditions. This has become a major problem in large machine tool maintenance work. An object of the present invention is to provide an automatic leveling device that solves these problems.

0004

[Means for Solving the Problems] An automatic leveling device for a machine tool according to the present invention includes a leveling detection means for a machine bed 15 of a machine tool, a control means, and a leveling block 2.
0, the leveling block 20 consists of a vertical slider 22, a horizontal slider 23, and a hydraulic lifter 5, and is disposed below the machine bed 15 of the machine tool,

The leveling detection means is composed of a plurality of water containers 10 and a laser displacement meter 8, which are connected to each other by water pipes 21 in accordance with the arrangement position of the leveling block 20, and detects level changes in the machine bed 15 of the machine tool using water. container 1
0 as a distance change between the water surface and the laser displacement meter 8, and inputs the detection signal to the computer 1, and the control means includes a solenoid valve 4 that controls the hydraulic cylinder 5, a sequencer 3, and the computer 1, The sequencer 3 is characterized by inputting signals from the computer 1 and signals from a plurality of proximity switches and outputting them to the solenoid valve 4.

[0006]

[Operation] When the machine bed of the machine tool is completely leveled, the distance between the water surface in the water container 10 shown in FIG. 5 and the laser displacement meter 8 shown in FIG. 5 is constant with no difference. When the level of the machine bed is out of order, the position of the laser displacement meter 8 differs depending on the location with respect to the water surface.

[0007] The water level of each water container in the apparatus of the present invention is always constant because it is connected to the water pipe 21 as shown in FIG. Therefore, the distances between the laser displacement gauges and the water surface are input into the computer as shown in Figure 1, processed by a control program that keeps the distance between each laser displacement gauge and the water surface constant, and the solenoid valves are activated using the control signals. The leveling of the machine tool is automatically performed by controlling and driving the hydraulic cylinder.

[0008]

Embodiment FIG. 1 is a block diagram of a control device according to an embodiment of the present invention. Computer 1 controls the entire control. An analog/digital converter (hereinafter referred to as an A/D converter) 12 is connected to the level measurement side of the computer 1, and level data from a laser displacement meter 8 is inputted thereto via a laser controller 11. On the other hand, an input/output interface (PIO) 2 and a sequencer 3 are connected to the operation side that moves the machine bed up and down. A stroke end proximity switch and a proximity switch for detecting contact between the vertical slider 22 in FIG. 4 and the lower surface of the machine bed in FIG. 3 are connected, and a solenoid valve 4 for hydraulic control is connected to the output section. There is. This valve 4 controls the drive of the hydraulic cylinder 5. In addition, the control program 14 is a laser displacement meter 8.
(Multiple) information data are collected for each solenoid valve 4.
control the operating time. FIG. 2 shows the machine bed of the device according to the invention.

FIG. 3 shows a situation in which the machine tool bed of FIG. 2 is equipped with a laser displacement meter 8, a water container 10, a water pipe connector 18, a water pipe 21, and a leveling block 20 powered by the hydraulic cylinder 5 according to the present invention. .

Note that 20' is a base plate. Figure 4
1 shows a situation in which the vertical slider 22 and the horizontal slider 23 on the leveling block 20 are driven by the control of the solenoid valve 4 and the hydraulic cylinder 5. Here, solenoid valve 4
The flow rate of the hydraulic oil flowing inside is extremely restricted.
When the distance between the laser displacement meter 8 in FIG. 5 and the water surface 9 reaches the value indicated by the computer 1 in FIG. 1, the system is closed.

There are a vertical slider 22 and a horizontal slider 23 inside the guide 24 attached to the base plate 20' in FIGS. 6 and 7, and a bolt 26 is installed in the notch of the horizontal slider 23. A bolt is connected to the piston rod 28 of the hydraulic cylinder 5. In addition, 37 is the piston rod 28
27 is an adjustment nut, and 29 is a connecting bolt between the hydraulic cylinder 5 and the guide 24.

Next, the base plate 2 in FIGS. 6 and 8
0' is connected to a housing 30 by a bolt 36, and a clamp cylinder 34 is screwed to the inner peripheral side of the housing. A piston rod 41 having a pusher 42 is disposed above the piston 44 of the cylinder 34, and a clamp spring 43 is disposed below the piston 44. Hydraulic port 4
When the hydraulic pressure is applied to 0, the piston 44 moves downward against the clamp spring 43, thereby eliminating the clamping force of the clamp bar 25, resulting in an unclamped state. The bracket 33 is bolted to the guide 24, and the clamp bar 25 is supported on the bar 33 on the bracket 33. In addition, the base plate 20'
is fixed to the floor concrete by anchor bolts 38 and nuts 32. FIG. 11 is an explanatory diagram of correction of the horizontal gap of the vertical slider according to the embodiment of the present invention. Figures 12 to 14
shows a flowchart according to an embodiment of the present invention. For ease of explanation, the explanation will be based on the models shown in FIGS. 15 and 16.

FIG. 15 shows a situation where the machine tool is fully leveled. In this case, the distance between the laser displacement meter and the water surface at each leveling point of P1 to P6 is 100 m.
It is constant at m. FIG. 16 shows a situation in which each level is changed from FIG. 15. In FIGS. 12 to 14, initial settings are made in S1, and all level points are set to the lowest level in S2. In S3, the horizontal gap of the vertical slider is corrected as shown in FIG. In S4, the data of each measurement point is sorted in order of magnitude, and the maximum data is determined. In S5, the maximum data is set to zero, so that only negative numbers can be processed. At level point P4 of the model shown in FIGS. 15 and 16, the difference expressed in μm (hereinafter referred to as SA) = 0 - [(maximum data) - (data of each level point)] = 0 - [10,000 -(-4,000)
]=-14,000 (μm). In S6, SA=
-100 or not, that is, whether or not the level difference is 0.1 mm or more, it is determined whether or not level correction is necessary. If NO in S6, the process advances to S15.

If YES in S6, that is, if the level difference is 0.1 mm or more and correction is necessary, the clamp is released by hydraulic pressure in S7, and unclamping is confirmed in S8. Here, lookup means checking the ON/OFF state of the proximity switch by a computer. S
In step 9, it is determined whether or not unclamping has been completed. S9
If the answer is NO, proceed to END via an alarm. Y in S9
If it is ES, the process advances to S10 and the flags of each level point are reset.

[0015] In S11, the vertical slider 2 is
The hydraulic cylinder is operated so that 2 is raised, and after the time set by the timer in S12, the process proceeds to S13. A stop command for the hydraulic cylinder is issued in S13, and a clamp command is issued in S14.

In S15, it is determined whether SA>-100, that is, whether the level difference is 0.1 mm. NO in S15
If so, proceed to S19. If YES in S15, S16
In step S17, a clamp command is issued, and in step S18, a leveling completion flag is set. S19
Then, it is determined whether sensing of all level points has been completed.

If NO in S19, the process returns from S19 to S5, and processes from S5 onwards are performed until sensing of all level points is completed. This loop sequentially sets each level point. If YES in S19, the process advances to S20. When sensing of all level points is completed, the upper limit proximity switch is looked up in S20, and it is determined in S21 whether the upper limit proximity switch is on. If YES in S21, the process proceeds to END via an alarm.

If NO in S21, the process advances to S22. S
In step 22, lookup of the close proximity switch is performed, and in step S2
In step 3, it is determined whether the close proximity switch is open or not. S
If NO in 23, the process advances to S37.

[0019] If YES in S23, proceed to S24, and
After the time set by the timer No. 25, the process advances to S26. S
In step 26, the unclamp proximity switch is looked up, and in step S27 it is determined whether or not it is unclamped.

[0020] If NO in S27, E
Proceed to ND. If YES in S27, the process advances to S28, where an ascending start command is issued, and after the time set by the timer in S29, the process advances to S30. At S30, an ascending command is issued, and at S31
Performs a lookup for the ascending proximity switch. In S32, it is determined whether the upper limit proximity switch is ON. S32
If YES, proceed to END via an alarm. S32
If the answer is NO, the process advances to S33 to look up the close proximity switch. In S34, it is determined whether the close proximity switch is open. If YES in S34, S28
The process from S28 onwards is performed until the contact is achieved. If NO in S34, the process proceeds to S35, where a lift stop command is issued, and in S36, a clamp command is issued. In S37, it is determined whether all the level points have been brought into close contact with each other. If NO in S37, the process returns to S20 and processes from S20 onwards are performed. If YES in S27, the process advances to S38 and the leveling completion flag is read. In S39, it is determined whether leveling of all level points has been completed. If NO in S39, the process returns to S4 via a timer and processes from S4 onwards are performed. If it is EYS in S39, proceed to S40, display a message from the completion of leveling, and
Proceed to ND.

[0021]

[Effects of the Invention] Since the present invention is constructed as described above, it produces the following effects. (1). It is possible to automate and speed up the leveling work of machine tools, which conventionally relied on manual labor.

(2). In the case of large machine tools, leveling work, which could only be done once or twice a year for economic reasons, can now be done all the time. This has made it possible to improve and maintain the static accuracy of large machine tools.

[Brief explanation of the drawing]

FIG. 1 is a system block diagram according to an embodiment of the present invention.

FIG. 2 is a diagram showing a machine bed of a machine tool body according to an embodiment of the present invention.

FIG. 3 is a diagram showing a state in which leveling equipment is mounted on a machine bed of a machine tool according to an embodiment of the present invention.

FIG. 4 is a diagram showing a hydraulic drive state of the leveling block according to the embodiment of the present invention.

FIG. 5 is a diagram showing a horizontal measurement situation by the laser displacement meter according to the embodiment of the present invention.

FIG. 6 is a plan view of a power-driven leveling block and clamping mechanism according to an embodiment of the invention.

FIG. 7 is a sectional view taken along line AA in FIG. 6;

FIG. 8 is a side view including a partial cross section of FIG. 6;

FIG. 9 is a diagram showing a state in which the machine bed of the machine tool is fully leveled.

FIG. 10 is a diagram showing a state in which the leveling of the machine bed of the machine tool is incorrect.

FIG. 11 is an explanatory diagram of correction of the horizontal gap of the vertical slider according to the embodiment of the present invention.

FIG. 12 is a flowchart according to an embodiment of the present invention.

FIG. 13 is a flowchart according to an embodiment of the present invention.

FIG. 14 is a flowchart according to an embodiment of the present invention.

FIG. 15 is a diagram showing a model used to explain FIGS. 12 to 14.

FIG. 16 is a diagram showing a model used to explain FIGS. 12 to 14.

[Explanation of symbols] 1...computer, 2...input/output interface, 3...
Sequencer, 4...Solenoid valve, 5...Hydraulic cylinder, 8...Laser displacement meter, 9...Water surface, 10...Water container, 11
...Laser controller, 12...A/D converter, 15...Machine bed, 18...Water tube connector, 20...Leveling block, 20'...Base plate, 21...Water tube, 22...Vertical slider, 23...Horizontal slider, 61... Close contact confirmation proximity switch, 62...clamp-unclamp proximity switch, 71...upper limit confirmation proximity switch, 72...lower limit confirmation proximity switch.

Claims (1)

[Claims] 1. Leveling detection means for a machine bed (15) of a machine tool, control means, and a leveling block (
20), the leveling block (20) has a vertical slider (22) and a horizontal slider (22).
3) and a hydraulic cylinder (5), and is arranged below the machine bed (15) of the machine tool, and the leveling detection means is connected by a water pipe (21) in accordance with the arrangement position of the leveling block (20). Multiple connected water containers (
10) and a laser displacement meter (8), and a water container (10) that detects level changes in the machine bed (15) of the machine tool.
The detection signal is detected as a change in the distance between the water surface in the tank and the laser displacement meter (8), and the detected signal is input to the computer (1). (3) and a computer (1), and the sequencer (3) is connected to the computer (1).
and signals from multiple proximity switches,
An automatic leveling device for a machine tool characterized by outputting to a solenoid valve (4).