JP2003014405A - Workpiece stylus for both front and back surfaces - Google Patents

Abstract

(57) [Summary] [Problem] Regardless of the presence or absence of burrs around the back side of the machining hole,
Provide a stylus that can measure the front and back surfaces of a work. A surface measurement stylus (8) is provided on a center axis (7) of a touch probe (6) that sends out a signal when the center axis (7) swings.
At right angles. A contact ball 9 is provided at the tip of the surface measuring stylus 8 for contacting the surface Wa of the workpiece W, and the tip of a shank 10 mounted at a right angle in the vicinity of the contact ball 9 is parallel to the surface measuring stylus 8 for back surface measurement. A stylus 11 is attached. A contact ball 12 that contacts the back surface Wd of the workpiece W is provided at an end of the back surface measurement switch 11 on the central axis 7 side.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool, in particular, a machining center, a numerical control lathe, and is attached to a touch probe for measuring a workpiece inside the machine, and a plate of a workpiece having a hole formed therein. The present invention relates to a measurement stylus for measuring a thickness of a plate-shaped portion. 2. Description of the Related Art Japanese Patent Publication No. Hei 7-18686 is known as a touch probe mounted on a machine tool for measuring a workpiece. An outline of this will be described with reference to FIG. The center shaft 101 has its upper part supported by a spherical bearing 102,
The ball bearing 103 penetrates through the inside of the spherical bearing 102 and is fixed to the upper end. A stylus 104 having a straight rod shape is attached to the lower part. A contact ball 105 is attached to the tip of the stylus 104, and when the contact ball 105 comes into contact with the workpiece W1, the central axis 101 swings in the front-rear direction or the left-right direction on the paper surface of FIG. . This displacement also causes the ball receiver 103 fixed to the upper end of the center shaft 101 to swing. A ball receiver 103 has a conical hole 103a on the upper surface.
The conical hole 103a receives a ball 108 fixed to the lower end of a sliding shaft 107 which is slidable up and down and constantly urged downward by a spring 106, and is pressed against the conical hole 103a. Since the ball 108 always moves up and down together with the sliding shaft 107, the swing of the ball receiver 103 causes the conical hole 103 a to move.
Swings, the ball 108 slides on the slope of the conical hole 103a and displaces the sliding shaft 107 upward against the spring 106. The upward displacement of the sliding shaft 107 causes the sliding shaft 10
The pressing plate 109 integral with the member 7 also moves upward. The pin 110 is held down at the tip by the holding plate 109, and the rising of the pin 110 is regulated integrally with the pin 110, and the fixed switch piece 111 is pressed.
The movable switch piece 112 separated from the holding plate 109
Spring 113 that is weaker than spring 106 due to the upward movement of
And the contact 111 of the fixed switch piece 111
a contacts the contact 112a of the movable switch piece 112,
Send a contact signal. A touch probe as described above is mounted on a spindle of a machining center or a turret tool post of a numerically controlled lathe, and in-machine measurement of a work is performed using a stylus for measuring a work surface or a work side surface. [0006] Work measurement using such a probe will be described with reference to FIG. A touch probe 123 for measurement is mounted on the tip of a vertical spindle 122 rotatably supported in a spindle sleeve 121 of a vertical machining center, instead of a cutting tool by an automatic tool changer. Stylus 12 attached to touch probe 123
4 measures the upper surface and the side surface of the work W2. [0007] The stylus 124 described in the prior art is inserted from the machining hole of the work W2 to make the contact ball 125 contact the back surface W2a of the plate portion of the work W2. And the structure of the probe was not possible. For this reason, such a work requiring measurement of the back surface has to be taken out of the machine after processing, measured by another machine or an operator, or another measuring device is separately provided in the machine. As a result, there have been problems such as an increase in non-machining time, an increase in the work load of an operator, an increase in cost for installing a dedicated device, and an increase in space inside and outside the machine. The present invention has been made in view of the above-mentioned problems of the related art, and has as its object to provide a stylus that can measure the back surface of a plate-like work. According to a first aspect of the present invention, there is provided a stylus according to the first aspect of the present invention, wherein the center of the touch probe is capable of detecting a displacement in a direction perpendicular to an axis of a central axis. A stylus for measuring the surface of a workpiece fixed at right angles to the axis and provided with a contact to the work at the tip, a shank fixed at a right angle to the stylus for surface measurement near the contact, and a tip at the tip of the shank. A stylus for measuring the back surface of the work fixedly projecting from the shank and fixed to the center axis side in parallel with the stylus for surface measurement;
And a contact provided at an end of the stylus for measuring the back surface on the central axis side. According to the first aspect of the present invention, a stylus for surface measurement is fixed at right angles to the center axis of the touch probe, and a stylus for back surface measurement is fixed in parallel with the stylus for surface measurement to measure any of the front and back surfaces. Sometimes, the center axis of the touch probe is swung. Therefore, the sliding shaft is moved in the axial direction in the touch probe, and the contact of the movable switch contacts the contact of the fixed switch to send out a signal. In addition, since the contact of the stylus for measuring the back surface is attached so as to protrude from the shank so as not to interfere with the burr, the back surface can be reliably measured even when the burr is formed in the processing hole. Further, since the stylus for measuring the front surface and the stylus for measuring the back surface are integrated, there is no need to change the setup between the time of measuring the front surface and the time of measuring the back surface. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of a use state in which a stylus of the present invention is attached to a touch probe. The cutting tool is replaced by an automatic tool changer (not shown) at the tip of a vertical spindle 2 rotatably supported in a spindle sleeve 1 provided in a spindle head (not shown) which can be moved up and down and positioned on the vertical machining center. The work measuring device 3 is mounted. This work measuring device 3 has a mounting shank 4 of the same shape and dimensions as the cutting tool on the mounting side to the main shaft 2 and a rectangular parallelepiped block 5 for converting the mounting angle position of the touch probe on the outer side. ing. A touch probe 6 is attached to the block 5 at right angles to the axis of the mounting shank 4. A stylus 8 for measuring the surface of the work is fixed to the center axis 7 of the touch probe 6 at a right angle downward.
A contact ball 9 is provided at the lower end of the surface measurement stylus 8 as a contact that comes into contact with the surface Wa of the workpiece W during measurement. A shank 10 is fixed to the surface measuring stylus 8 in the vicinity of the lower end contact ball 9 at right angles to the surface measuring stylus 8. At the tip of the shank 10, a stylus 11 for back surface measurement is provided in parallel with the stylus 8 for surface measurement.
Is fixed, and a contact ball 12 is provided at the tip of the back surface measurement stylus 11 on the center axis 7 side as a contact that comes into contact with the workpiece at the time of measurement. The length of the shank 10 is such that the contact ball 12 can contact the back surface Wd of the work over a burr Wc generated around the lower surface of the work hole Wb by drilling the work W. The distance between the upper surface of the shank 10 on the side of the center axis 7 and the upper end position of the contact ball 12 is made larger than the normal height of the burr Wc to avoid interference with the burr Wc. The center axis 7 has a surface measuring stylus 8, a shank 10, a back surface measuring stylus 11, and two contact balls 9,
A total weight of 12 works. In order to prevent the central axis 7 from being tilted due to the weight and generating a signal when measurement is not performed, a spring (not shown) for keeping the central axis 7 horizontally balanced is provided at an appropriate position in the touch probe 6. It is a matter of course. With the above configuration, the spindle head (not shown) is moved up and down to bring the contact ball 9 into contact with the surface Wa of the work W, and the position of the spindle head when the signal is emitted from the touch probe 6 is used to adjust the surface Wa of the work W. Detect position. Further, the stylus for both front and back surfaces of the present invention is inserted from the machined hole Wb of the work W, and the contact ball 12 of the stylus 11 for back surface measurement is inserted.
The burrs Wc on the outer periphery of the lower surface of the processing hole Wb are straddled, and contact the lower surface Wd of the work W. Then, the position of the back surface Wd of the workpiece W is detected from the position of the spindle head when a signal is emitted from the touch probe 6. FIG. 2 shows another embodiment of the attached state of the touch probe. FIG. 1 shows a block 5 in which a normal touch probe 6 is attached, and the distance from the mounting shank 4 to the surface measurement stylus 8 is long. FIG. 2 omits the block 5, shortens the distance from the mounting shank 4 to the surface measuring stylus 8, and makes the measuring tool easy to be stored in the tool magazine. In FIG. 2, the same parts as those in FIG. The work measuring device 15 has a mounting shank 4 having the same shape and dimensions as a cutting tool on the mounting side to the main shaft 2, and has a main body 16 containing components of a touch probe on the outer side. The state in which the central axis 7 protrudes rightward from the main body 16 and the front surface measurement stylus 8 and the back surface measurement stylus 11 are fixed is the same as FIG. Since the stylus of the present invention is configured as described above, the following effects can be obtained. Claim 1
The stylus has a stylus for surface measurement fixed at right angles to the center axis of the touch probe, and a stylus for back surface measurement fixed to the stylus for surface measurement in parallel with the stylus for surface measurement. It is made to move. Therefore, the sliding shaft is moved in the axial direction in the touch probe, and the contact of the movable switch contacts the contact of the fixed switch to send out a signal. Further, since the contact ball of the back surface measuring stylus is attached so as to protrude from the shank so as not to interfere with the burr, the back surface can be reliably measured even if a burr is formed in the machined hole. Further, since the stylus for measuring the front surface and the stylus for measuring the back surface are integrated, there is no need to change the setup between the time of measuring the front surface and the time of measuring the back surface.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a use state in which a stylus of the present invention is attached to a touch probe. FIG. 2 is another embodiment of the state of attachment of the touch probe. FIG. 3 is an explanatory diagram of a conventional touch probe. FIG. 4 is an explanatory diagram of a backside measurement state according to the related art. [Description of Signs] 6 Touch probe 7 Center axis 8 Stylus for surface measurement 9, 12 Contact ball 10 Shank 11 Stylus for back surface measurement

Claims (1)

Claims: 1. A touch probe capable of detecting a displacement in a direction perpendicular to an axis of a center axis of a touch probe which is fixed at a right angle to the center axis and provided with a contact to the work at a tip thereof for measuring a surface of the work. A stylus, a shank fixed at a right angle to the surface measuring stylus in the vicinity of the contact, and a tip of the shank fixedly protruding from the shank by a predetermined dimension toward the central axis side in parallel with the surface measuring stylus. A stylus for measuring the back surface of the work, and a contact provided at an end of the stylus for measuring the back surface on the central axis side.