JPH06143098A - Measurement auxiliary tool and machining method using measurement auxiliary tool - Google Patents

Abstract

PURPOSE:To readily index dimensions with high accuracy by providing a mounting part on the side opposite to contact surfaces and by demountably mounting a detection piece on tire mounting part in such a way that an axis may be in parallel with a straight line and also may be on the bisector of a predetermined angle. CONSTITUTION:In a measurement auxiliary tool body 1, a through hole 41 serving as a mounting part is formed in the side opposite to contact surfaces 2, 3 in associate with an axis 4. The axis 42 of the through hole 41 is located on the bisector 43 of an angle beta. The inner surface of the through hole 41 is of a round having a radius alpha with the axis 42 as a center. The through hole 41 is constituted so that one end part 45 of a detection piece 44, a right circular cylinder-shaped bar, may demountably and exactly be inserted. Under this state, a straight line crossing with the extensions of surfaces 52, 53 agrees with the axis 4 of the measurement auxiliary tool body 1. When the transverse direction is X direction and the vertical direction is Z direction, the distance L4 required for measurement with high accuracy is obtained through calculation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measurement auxiliary tool and a processing method using the same.

[0002]

2. Description of the Related Art Conventionally, when grinding an inclined surface with respect to one surface of a work using a grinding wheel,
In order to perform the dimension indexing with high accuracy, for example, a three-dimensional measuring machine having a complicated structure is used.

[0003]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a measurement assisting tool which can be easily and highly accurately indexed when machining a slope using a grinding wheel, for example. It is to provide a processing method using the same.

[0004]

According to the present invention, there is provided (a) a measurement auxiliary tool body, comprising a pair of contact surfaces including a single imaginary straight line and forming a predetermined angle β around the straight line. And a measurement auxiliary tool body having a relief hole formed in the vicinity of the straight line and having a mounting portion on the side opposite to the contact surface with respect to the straight line, and (b) the outer peripheral surface has a uniform circular arc surface in the axial direction. And a detection piece that is detachably attached to the attachment part and that the axis is parallel to the straight line and that the axis is on the bisector of the angle β. is there.

Further, according to the present invention, the mounting portion is a through hole having a circular cross section having an axis line on the bisector, and the detection piece is a rod having a right cylindrical shape which is fitted into the through hole. Is characterized by.

The present invention is also characterized in that a permanent magnet piece facing the magnet is embedded in the contact surface.

The present invention is also characterized in that the angle β is either 90 ° or 60 °.

Further, according to the present invention, at least a part of the outer peripheral surface of the main body of the auxiliary measuring tool, which is continuous with the outer ends of the respective contact surfaces, has an arc-shaped cross section perpendicular to the axis with a radius centered on the straight line in the linear direction. It is characterized by having.

Further, the present invention has a pair of contact surfaces including a single imaginary straight line and forming a predetermined angle β around the straight line, and an escape hole is formed in the vicinity of the straight line. It is characterized in that the detected portion is formed on the side opposite to the contact surface.

Further, the present invention is characterized in that the detected portion is a through hole having a circular cross section having an axis on the bisector.

Further, according to the present invention, the two contact surfaces are respectively brought into contact with the two intersecting surfaces of the work, the measurement auxiliary tool main body is attached to the corner of the work, and the position where the rotary grindstone is brought into contact with the detection piece is set. It is characterized in that the grinding is performed at a predetermined grinding position in a direction perpendicular to the rotation axis of the rotary grindstone with reference to the reference.

[0012]

According to the present invention, for example, two adjacent surfaces of a metal workpiece are brought into contact with a pair of contact surfaces of the measurement auxiliary tool body, and the detection piece attached to the mounting portion of the measurement auxiliary tool body is contacted. The outer peripheral surface of a grindstone wheel such as an NC device is brought into very slight contact, whereby it becomes possible to perform dimensional indexing with high accuracy based on the end points which are virtual intersecting straight lines of the surface of the work. Since the detection piece comes into contact with the grinding wheel as described above and is therefore ground and is a consumable item, such a detection piece can be attached to and detached from the measurement auxiliary tool body.

Further according to the invention, a permanent magnet piece is embedded in the contact surface, whereby the measuring auxiliary tool body is magnetically attracted when the work is made of a ferromagnetic material,
The gap between the surface and the contact surface can be eliminated, and the measurement accuracy can be improved.

The mounting portion of the main body of the auxiliary measuring tool is a through hole having a circular cross section, for example, which penetrates in the thickness direction thereof, and the end portion of the detection piece, which is a rod having a right columnar shape, is fitted to the through hole so as to be detachable. It may be fitted in. If such a structure is adopted, the structure is simple, and with the detection piece removed, the circular through hole is detected by, for example, an optical detecting means to detect the through hole. Can be calculated to obtain the center, and based on the position, it can be carried out for dimensional indexing at the time of cutting the metal workpiece by electric discharge machining called a wire cutter or the like.

[0015]

1 is a plan view of a measurement auxiliary tool main body 1 according to one embodiment of the present invention, and FIG. 2 is a perspective view of the measurement auxiliary tool main body 1. The measurement auxiliary tool main body 1 is made of metal, is made of a material such as JIS SK3, and may be a ferromagnetic material or a non-magnetic material, or may be a synthetic resin material or another material. The measurement assisting tool main body 1 has a pair of contact surfaces 2 and 3, and these contact surfaces 2 and 3 intersect each other at a single imaginary straight line 4, and these contact surfaces 2 and 3 are the straight lines. 4 forms a predetermined angle β, for example 90 ° in this embodiment. The angle β is
For example, it may be 60 °, or another angle. The angle β between the contact surfaces 2 and 3 may be set to a value that matches the angle formed by the adjacent surfaces 52, 53; 54, 55 of the works 48, 53. This measurement auxiliary tool main body 1 is formed with a notched escape hole 5 having a uniform inner diameter in the axial direction centered on a straight line 4 (direction perpendicular to the paper surface of FIG. 1). The outer peripheral surface 6 connected to the outer ends 2a and 3a of the contact surfaces 2 and 3 has a radius R1 centered on the straight line 4 and an arc-shaped axis perpendicular to the straight line direction (direction perpendicular to the paper surface of FIG. 1). It has a cross section. In this embodiment, almost all of the outer peripheral surface 6,
That is, it has a radius R1 over about 270 ° in the circumferential direction. For example, R1 = 20 mm.

Permanent magnet pieces 9 and 10 facing the contact surfaces 2 and 3 and the magnetic pole surfaces 7 and 8 are embedded. The pole faces 7 and 8 are
It is flush with the contact surfaces 2, 3.

FIG. 3 is a sectional view of the vicinity of the permanent magnet piece 9. The permanent magnet piece 9 is fixed in the recess 11 formed in the measurement auxiliary tool body 1 by using a synthetic resin adhesive 12 or by press fitting. The other permanent magnet piece 10 has a similar structure. Since the magnetic pole surfaces 7 and 8 are only partially exposed from the contact surfaces 2 and 3, it is possible to prevent the cutting pieces or the grinding powder from adhering to the contact surfaces 2 and 3 by the magnetic attraction force as much as possible during drilling. Even if they are attached, the magnetic pole surfaces 7 and 8 are flush with the contact surfaces 2 and 3, so that they can be easily wiped off. The magnetic pole surfaces 7 and 8 may be recessed or protruded from the contact surfaces 2 and 3.

In the main body 1 of the auxiliary measuring tool, a through hole 4 as a mounting portion is provided on the side opposite to the contact surfaces 2 and 3 with respect to the axis 4.
1 is formed. The axis 42 of the through hole 41 has an angle β
On the bisector 43, and the inner surface of the through hole 41 is
It is a circle centered at and having a radius α. The one end portion 45 of the detection piece 44, which is a right cylindrical columnar bar shown in FIG. 2, can be fitted into the through hole 41 so as to be insertable and removable. In a state where the end portion 45 of the detection piece 44 is fitted in the through hole 41, the axis line 46 of the detection piece 44 coincides with the axis line 42 of the through hole 41, and these axis lines 42, 46 are
It is parallel to the straight line 4 and parallel to the contact surfaces 2 and 3.

FIG. 4 is a view showing the construction of an NC device or the like on the inclined surface 49 of a metal or non-metal work 48 using the grinding wheel 50 by using the measurement auxiliary tool body 1 and the detection piece 44 of one embodiment of the present invention. It is a figure for demonstrating the principle at the time of grinding by a machine. The work 48 has a rectangular parallelepiped shape as shown by the phantom line 51 in FIG. 5, and is intended to grind the inclined surface 49 over the adjacent orthogonal surfaces 52 and 53 of the work 48. The distance L3 from the surface 53 to the end 54 of the inclined surface 49 along the surface 52, and the inclined surface 49
It is assumed that the angle θ1 formed by the surface 53 of the above is set. The surfaces 52 and 53 are brought into contact with the contact surfaces 2 and 3 of the measurement auxiliary tool main body 1, and when the work 48 is made of a ferromagnetic material, the attached state is maintained by the magnetic attraction force of the permanent magnet pieces 9 and 10. The work 48 is clamped and fixed on the reference surface 115 on the surface of the table 114 of the NC device,
The measurement assisting tool main body 1 is attached to the surfaces 52 and 53 as described above. A detection piece 44 is attached to the measurement auxiliary tool body 1. In this state, the intersecting straight line 66 (see FIG. 5) on the extension of the surfaces 52 and 53 is the measurement auxiliary tool body 1
Coincides with the axis line 4 of. When the left-right direction in FIG. 4 is the x direction and the up-down direction in FIG. 4 is the z direction, the distance L4 that requires measurement with high accuracy is obtained from Equation 1.

L4 = a + R2 · sin (θ1 + 45) + L5 (1) L5 = L3 · cos θ1 (2) Here, a is the inner diameter of the through hole 41, and therefore the detection piece 44.
Is the outer diameter of. The clamp means fixes the inclined surface 49 to be ground to the table 14 so as to be parallel to the reference surface 115. R2 is the distance from the straight line 4 of the measurement auxiliary tool main body 1 to the axis line 42. For example R1 = 2
0 mm and R2 = 10 mm.

The bisector 43 is the contact surface 2, as described above.
3 is a line that divides the angle β formed by 3 into two equal parts, and therefore, even if either the back side or the front side of the measurement assisting tool main body 1 is attached to the work 48 with the upper side of the paper surface of FIG. It is possible and easy to calculate.

With reference to FIG. 6, an operation when the inclined surface 49 of the work 48 is ground by the grinding wheel 50 using the NC device will be described. As shown in FIG. 6A, the grinding wheel 50 is displaced in the xz plane, and the position when the surface of the grinding wheel 50 slightly contacts the detection piece 44 is detected. X of this grinding wheel 50
The distance L4 is calculated by using the position in the -z plane as a reference. Therefore, the grinding wheel 50 is moved as shown in FIG. 6 (2), and then the lower surface of the grinding wheel 50 is moved to the distance L4.
If it moves down in that direction and moves in the x direction,
As shown in (3), the work 48 is ground to form the inclined surface 4
9 can be formed and processed.

FIG. 7 is a sectional view showing a state when the drill hole 14 is cut in the metal work 13 by using the measurement auxiliary tool main body 1. A table 11 that is movable in the horizontal x direction of a machine tool such as an NC device or a milling machine.
The work 13 is fixed on the reference surface 115 of No. 4 by a clamp means (not shown). The work 13 has a rectangular parallelepiped outer shape or has another shape, and the angle α of the axis of the drill hole 14 and two adjacent surfaces 15,
16 of the axis 1 of the drill hole 14 from one surface 15
A distance A1 along the other surface 16 up to 7 shall be set. The contact surfaces 2 and 3 of the measurement auxiliary tool main body 1 are attached to the surfaces 15 and 16 in contact with each other. At this time, if the work 13 is a ferromagnetic material, the work 13 is magnetically attracted by the permanent magnet pieces 9 and 10, and each surface 15, The measurement auxiliary tool main body 1 is held on the work 13 without a gap between the contact surface 16 and the contact surfaces 2 and 3. The work 13 is fixed to the reference surface 115 by the clamp means at an angle θ (θ = α) equal to the above-mentioned angle α. The touch sensor and the drill in the NC device are arranged in the x direction parallel to the reference plane 115, which is the left-right direction in FIG. 7, the z-axis direction perpendicular to the reference plane 115 and parallel to the paper plane in FIG. It can be set by being displaced relative to the table 114 in the y direction. As shown in FIG. 8 (1), a right columnar touch sensor 18 of an NC device is brought into contact with the outer peripheral surface 6 of the measurement auxiliary tool main body 1, and the axis of the drill hole 14 to be formed is formed from the contacted position. The distance L1 to 17 in the x direction can be calculated and obtained. The touch sensor may be a round bar, a slice bar, or a measuring device with a pointer (for example, a lever type dial gauge). Instead of a drill, an end mill or grindstone may be used.

L1 = R1 + A1 · cos θ (3) By inputting the angle θ, the distance A1, the radius R1 of the outer peripheral surface 6 of the measurement auxiliary tool main body 1, the outer diameter of the touch sensor 18, etc. in the NC device, as shown in FIG. The axis 20 of the drill 19 shown in 2) is the axis 17 of the drill hole 14 to be drilled.
The drill 19 can be moved to match In this way, the measurement assisting tool main body 1 having an extremely simple structure can be used to perform dimension indexing, and the drill hole 14 can be processed with high accuracy.

The escape hole 5 is formed on the surfaces 15 and 16 of the work 13.
Even if there are burrs in the corners 21 of the
It enables the contact surfaces 2 and 3 to adhere to 5 and 16.
The distance A1 · cos θ in FIG. 7 is the position of a virtual intersecting straight line of the surfaces 15 and 16 and the axis 1 of the drill hole 14 to be machined in the xz plane, that is, in the plane of FIG.
7 and the length in the x direction.

When machining the drill hole 14 in the work 13 by using the drilling machine having the drill attached to the milling machine, as shown in FIG. 9 (1), the chuck 22 is used.
A rectangular cylindrical touch sensor 23 having an outer diameter set in advance with high accuracy is attached to the chuck 22, and thus the touch sensor 23 is rotationally driven around its axis 24, while the outer peripheral surface 6 of the measurement auxiliary tool body 1 is , The position of the chuck 22 in the x-ray direction is reset at this time, and then the chuck 22 is raised to move the axis 24 in the x-direction by the radius R1 of the outer peripheral surface 6 as shown in FIG. 9 (2). Then straight line 4
So that the axis 24 exists immediately above, and the position in the x direction is reset here. Next, the touch sensor 23 of the chuck 22 is removed, and the drill 25 is removed as shown in FIG.
4 and the distance A in FIG. 4 calculated in advance in the x direction.
Move 1 · cos θ to bring it to the position indicated by reference numeral 25a, where this drill 25a is moved in the z direction as shown in FIG.
(3) is displaced downward and the drill hole 14 is drilled.

FIG. 10 is a perspective view of a measurement auxiliary tool 51 according to another embodiment of the present invention. This embodiment is similar to the previous embodiment, and corresponding parts bear the same reference numerals. The measurement auxiliary tool 26 has an outer peripheral surface 6 having a 90 ° arc-shaped cross section perpendicular to the axis around the axis 4, and further has extending portions 27, 28 extending in a rod shape along the contact surfaces 2, 3. Thus, the entire shape of the measurement auxiliary tool 26 is L-shaped. A through hole 41, which is a mounting portion, is formed in the main body 26 of the auxiliary measurement tool, and a detection piece 44 is fitted into the through hole 41 and is detachably mounted. The present invention can also be implemented by such an embodiment.

FIG. 11 is a plan view showing the principle of dimensional indexing when a metal workpiece 53 such as a wire cut is subjected to electric discharge machining using the measurement auxiliary tool main body 1 according to still another embodiment of the present invention. Reference surface 11 of table 114
In a state in which the contact surfaces 2 and 3 are in contact with the orthogonal surfaces 54 and 55 of the work 53 in a horizontal xy plane parallel to the contact surface 5, the two points 56 and 57 in the x direction and y in the through hole 41 are attached. Two points 58 and 59 in the direction are optically detected, and thereby a virtual center 60 is calculated by the least square method or the like. The center 60 is a position that is uniquely determined relative to the straight line 4 of the measurement auxiliary tool main body 1. In this way, the center 60 of the through hole 41, and hence the centroid thereof, can be calculated and obtained, and the calculation of the dimension can be performed.

As another embodiment of the present invention, as shown in FIG.
When machining the drill hole 29 in the work 13, when the angle α, the thickness T of the surface 30 and the distance A2 from the surface 30 to the axis 311 of the drill hole 29 are set, the surface 30 and the other surface By contacting the contact surfaces 2 and 3 of the measurement auxiliary tool 1 with 31, the length L2 required in the NC device or the drilling machine can be obtained as shown in the equation 2.

L2 = R1 + T · sin θ + A2 · cos θ (4) The present invention also applies not only to a drill using a milling machine,
It can also be applied to machine tools in general when machining with an end mill.

[0031]

As described above, according to the present invention, it is possible to easily and highly accurately perform size indexing when a slope is ground by using a grinding wheel with a simple structure.

Further, according to the present invention, a detection piece such as a right circular cylindrical bar can be attached to and detached from the through hole which is the mounting portion of the measurement auxiliary tool, and when the detection piece is ground by a grinding wheel or the like. By exchanging, the measurement accuracy can be maintained at high accuracy.

Further, according to the present invention, at least a part of the outer peripheral surface of the main body of the auxiliary measurement tool has an arc-shaped axis whose radius is uniform about the straight line where the pair of contact surfaces virtually intersects each other. This is a right-angled cross section, which makes it possible to easily and highly accurately perform dimension indexing, for example, when a touch sensor or a drill such as an NC device or a milling machine is brought into contact with the drill to machine an oblique hole.

[Brief description of drawings]

FIG. 1 is a plan view of a measurement auxiliary tool main body 1 according to an embodiment of the present invention.

FIG. 2 is a perspective view of a measurement auxiliary tool main body 1.

FIG. 3 is a cross-sectional view near a permanent magnet piece 9.

FIG. 4 is a diagram for explaining the principle of grinding an inclined surface 49 of a work 48 using the auxiliary measurement tool body 1 and the detection piece 44.

FIG. 5 is a perspective view showing a measurement auxiliary tool 47 and a work 48 according to an embodiment of the present invention.

FIG. 6 is a view for explaining the operation when grinding the inclined surface 49 of the work 48 using the grinding wheel 50.

FIG. 7 is a cross-sectional view for explaining the principle of dimensional indexing using the measurement auxiliary tool main body 1.

FIG. 8 is a cross-sectional view showing a state when the drill hole 14 is processed using the NC device.

FIG. 9 is a cross-sectional view showing a state when the drill hole 14 is processed using the drill processing device.

FIG. 10 is a perspective view of a measurement auxiliary tool 51 according to another embodiment of the present invention.

FIG. 11 is a center 60 of the through hole 41 of the measurement auxiliary tool body 1.
It is a figure for demonstrating operation | movement at the time of performing a dimension index using.

[Explanation of symbols]

 1,26 Measurement auxiliary tool body 2,3 Contact surface 4 Straight line 5 Through hole 6 Outer peripheral surface 9,10 Permanent magnet piece 44 Detection piece 47,51 Measurement auxiliary tool 48,53 Work piece 50 Grinding wheel

Claims (8)

[Claims] 1. A measuring auxiliary tool main body, comprising: a pair of contact surfaces including a single imaginary straight line and forming a predetermined angle β around the straight line; A measurement auxiliary tool body having a hole formed therein and having a mounting portion provided on the side opposite to the contact surface with respect to the straight line, and (b) an outer peripheral surface having a uniform arcuate surface in the axial direction, which is attachable to and detachable from the mounting portion. And a detection piece attached such that the axis is parallel to the straight line and the axis is on the bisector of the angle β. 2. The mounting portion is a through hole having a circular cross section having an axis line on the bisector, and the detection piece is a rod having a right circular column shape that is fitted into the through hole. The measurement auxiliary tool according to claim 1. 3. The measurement assisting tool according to claim 1, wherein a permanent magnet piece facing the magnet is embedded in the contact surface. 4. The measurement auxiliary tool according to claim 1, wherein the angle β is either 90 ° or 60 °. 5. The measurement auxiliary tool main body has at least a part of an outer peripheral surface which is continuous with the outer ends of the respective contact surfaces and has an arc-shaped right-angled cross section whose radius centered on the straight line is uniform in the straight line direction. The measurement auxiliary tool according to claim 1. 6. A pair of contact surfaces including a single imaginary straight line and forming a predetermined angle β around the straight line, an escape hole being formed in the vicinity of the straight line, and the contact surface with respect to the straight line. Is a measurement assisting tool, in which a detected portion is formed on the opposite side. 7. The measurement auxiliary tool according to claim 6, wherein the detected part is a through hole having a circular cross section having an axis on the bisector. 8. The contact surface is brought into contact with each of two intersecting surfaces of a work, and a measurement assisting tool main body is attached to a corner of the work, with reference to the position where the grinding wheel comes into contact with the detection piece. The processing method using the measurement auxiliary tool according to claim 1, wherein the grinding is performed at a predetermined grinding position in a direction perpendicular to the rotation axis of the grinding wheel.