JPS596989Y2 - Finished dimension comparison measuring device for workpieces in machine tools - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a measuring device that accurately and easily measures and compares the finished dimensions of a workpiece cut with a machine tool with reference dimensions.

When measuring the finished dimensions of a workpiece (workpiece) that has been cut using a milling machine, etc., conventionally, the workpiece after processing is removed from the workpiece fixture and measured using a measuring instrument, but if the workpiece is exposed to cutting oil or the workpiece fixture. Errors are likely to occur because the temperature changes due to the thermal influence of the crocodile, and in particular, if the crocodile is overheated and expands, causing an error in the measured dimensions on the positive side, the amount of cutting will be excessive, causing problems.

This idea was made in view of the above problems,
A master with standard dimensions made of a material with the same expansion coefficient as the workpiece is provided, and the master is attached to the workpiece attachment/detachment position with the workpiece transferred to the processing position relative to the workpiece fixture, and the workpiece is finished at the workpiece attachment/detachment position. To provide a device that compares and measures dimensions with reference dimensions of a master that has undergone the same temperature change, and performs accurate dimension measurements without errors.

This invention will be explained in detail below with reference to embodiments shown in the drawings.

1 and 2 are cutters, 3 is a hydraulic cylinder for transferring a work fixture, and 4 is a hydraulic cylinder for transferring a measuring instrument, each of which is attached to a machine tool body (not shown).

Piston rod 5 of the cylinder 3 for transferring the workpiece fixture
A workpiece fixture 6 is fixed to the tip of the workpiece fixture 6.
The workpiece 7 (in this embodiment, the crankcase split into two) is removably attached to the tip of the workpiece 7, and the master 8 is attached to the base end of the piston rod connection side of the workpiece holder 6.
It is designed to be removably attached.

The workpiece 7 is attached to the tip of the workpiece fixture 6 with the piston rod 5 at its retracting limit relative to the workpiece fixture 6, and the tip of the workpiece fixture 6 is in the attachment/detachment position shown by A in the figure, and after the workpiece 7 is attached, When the piston rod 5 is extended and the workpiece 7 at the tip of the workpiece fixture is located at the machining position B where the cutters 1 and 2 are arranged, the base end of the workpiece fixture 6 is located at the attachment/detachment position A, and the base end The master 8 is attached to the.

At the attachment/detachment position A, a hydraulic cylinder 4 for transferring the measuring instrument is disposed on the side of the workpiece fixture 6 in a direction perpendicular to its transfer direction (attachment/detachment position A #processing position B), and the hydraulic cylinder 4 for transferring the measuring instrument is disposed on the side of the workpiece fixture 6, and the hydraulic cylinder 4 for transferring the measuring instrument is disposed on the side of the workpiece fixture 6. A dimension measuring device 10 is attached to the tip of a piston rod 9 extending toward the tool.

The measuring device 10 is provided with four protruding probes 11a to 11d that grip both upper and lower surfaces and front and rear surfaces of the workpiece 7 and master 8 while facing each other during measurement when the piston rod 9 is extended.

The measuring device 10 stores the measured dimensions of the master 8 and measures the workpiece 7.
I try to measure and compare it with the finished dimensions.

The cutter 1 cuts the upper surface of the workpiece 7, and the cutter 2 cuts the rear surface of the workpiece 7.

According to the above device, when measuring the finished dimensions of the workpiece 7 that has been cut by the cutters 1 and 2, first the master 8 at the attachment/detachment position A expands due to the same temperature change as the workpiece 7 during machining. After measuring the dimensions of the cylinder 4 with the measuring device 10 as shown in the figure, and storing the measured values immediately after machining, the piston rod 9 of the cylinder 4 is retreated and the measuring stylus 11 a to 11 are measured.
Remove d from master 8.

Thereafter, the piston rod 5 of the cylinder 3 is moved back, the workpiece 7 at the tip of the workpiece fixture 6 is positioned at the attachment/detachment position B, and then the piston rod 9 of the cylinder 4 is extended to attach both the top and bottom and front and rear surfaces of the workpiece 7 to the contact point 11. 1-11 d
The dimensions of the workpiece 7 are measured and compared with the measured values of the master 8 stored above.

In this way, since the reference dimensions of the master, which are expanding under the same temperature change, and the finished dimensions of the workpiece are compared and measured, the workpiece can be accurately measured without errors caused by temperature changes.

Furthermore, changes in finished dimensions can be immediately and accurately detected, and changes in finished dimensions can be corrected without delay, making it easy to maintain finished dimensions of each workpiece within a predetermined tolerance. can.

Further, the finished dimensions of the front and back and top and bottom of the workpiece can be measured simultaneously while the workpiece is still attached to the workpiece fixture, and the measuring work can be performed quickly and easily.

[Brief explanation of drawings]

The drawing is an overall configuration diagram showing one embodiment of this invention. 1, 2...Cutter, 3, 4...Hydraulic cylinder, 5, 9...Piston rod, 6...
... Workpiece mounting fixture, 7 ... Workpiece, 8 ...
...Master, 10... Measuring instrument, 11 a
~11 d... Measuring head.

Claims (2)

[Scope of utility model registration request] (1) A workpiece holder that transfers the workpiece from the attachment/detachment position to the processing position, and a workpiece attached to the workpiece holder so that the workpiece is positioned at the attachment/detachment position after the workpiece has been transferred to the processing position. Finished dimensions of a workpiece in a machine tool, characterized in that it is equipped with a master made of the same material as the workpiece, and a measuring device that compares and measures the vertical and frontal dimensions of the workpiece and the master at the attachment/detachment position of the workpiece. Comparative measuring device. (2) Comparison of finished dimensions of a workpiece in a machine tool, characterized in that the measuring instrument according to claim (1) is equipped with a measuring head that grips the top and bottom and front and back of the workpiece and the master. measuring device.