JP3200721B2 - Gap measurement tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gap measuring instrument for measuring the size of a gap between two members.

[0002]

2. Description of the Related Art The measurement of a gap as described above is performed by, for example, a caliper. However, when measuring a gap in a deep place between a large upper die and a large lower die of a large press, it is difficult to achieve the purpose by using a caliper alone. Therefore, for example, place the clay in the above place, crush the clay by matching the upper mold and the lower mold to a predetermined state, then separate the upper mold and the lower mold, take out the crushed clay, and use a caliper to measure the thickness of the clay. The dimension of the gap is measured by measuring the distance.

[0003]

However, in the above-described method, the clay is easily deformed and deformed in the course of various operations such as separating the mold and removing the clay, and furthermore, the caliper is added to the clay. When applied, the clay is dented, so that the measurement size by the caliper tends to be out of order, and there is a problem that the measurement accuracy of the size of the gap is extremely reduced.

Therefore, the applicant company has one surface as an abutting surface for abutting against one of the objects to be measured, and the other surface has a base member provided with a coil whose inductance changes depending on the distance of the magnetic member, and a base member provided with a coil. The surrounding member is formed in a hollow cylindrical shape with a magnetic material so that magnetic flux from the coil does not reach the other object to be measured in a state surrounding the periphery of the coil. When the other DUT approaches the one DUT, the other DUT abutment member connected to the enclosing member to move the enclosing member in the base member direction along with the one DUT. The present inventors have devised a gap measuring tool provided with the above-mentioned technique so that the gap dimension can be accurately measured (Japanese Patent Application No. 5-66186).

[0005] However, as shown in FIG.
In the process of selecting the thickness of the sliding plate 54 to be attached to the lower die 52 in order to position the
It is necessary to measure the gap size G of the space 55 for positioning the sliding plate 54 by setting the position 57. In this case, the side element of the die set which is one of the objects to be measured for the gap measurement is required. 53
Side surface of the upper mold 57 which is the other object to be measured with respect to the inner surface 53a of the
57a proceeds in parallel.

When the gap measuring tool is used in such a place, as shown in FIG. 13, the other object to be measured 57 is moved with respect to the outer peripheral side surface of the surrounding member 31h which can move in the direction of arrow 59h.
a is in contact with the surrounding member.
There has been a problem that the guide body that guides the advance or retreat of 31h is broken.

The present invention has been made to solve the above-mentioned problems (technical problems) of the prior art, and it is possible to obtain the size of the gap as an electric signal corresponding to the size of the gap. It is intended to provide a gap measuring tool which can measure the gap with high accuracy even in the dimension of the gap over a large stroke range and even when the object to be measured is a magnetic material. A gap measuring tool that can accurately measure the gap between the opposing surfaces between the two DUTs even when the other DUT arrives at the surface of the DUT from a direction parallel to the surface. It is intended to provide.

[0008]

In order to achieve the above object, the gap measuring device according to the present invention has one surface as an abutting surface for abutting one of the objects to be measured, and the other surface according to the distance of the conductive material. A base member provided with a coil having a variable inductance, and a guide body provided on the other surface of the base member are guided in the direction of the base member toward and away from the base member, and the approaching member surrounds the periphery of the coil. Accordingly, the surrounding member formed in a hollow cylindrical shape with a conductive material so that the magnetic flux from the coil does not reach the other DUT, and when the other DUT approaches the one DUT, the surrounding member is formed. The other contact member for contacting the object to be measured, which is connected to the surrounding member to move the surrounding member in the direction of the base member, has one end engaged with the above-mentioned member so as to be tiltable, and the other end thereof. The above surrounding member When the other DUT arrives in parallel with the one DUT toward the outer peripheral surface of the surrounding member, the other DUT extends obliquely across the side of the outer peripheral side surface. A guide member that is tilted by the contact of an object to move the contact member toward the base member, and an engagement portion of the contact member with the guide member and a tip end in a direction opposite to the base member. During the period, when the other device under test arrives in parallel as described above,
The device is characterized in that it has an inclined surface for driving the member toward the base member by being driven by the object to be measured.

[0009]

The gap measuring tool is placed on one of the objects to be measured, and the other object is brought closer. The other object to be measured is in contact with the corresponding member of the gap measuring tool, and the surrounding member is moved toward the coil. Then, the inductance of the coil changes. When the value after the change is electrically extracted, the gap size between the two DUTs can be determined. On the other hand, when the other object to be measured advances parallel to the object to be measured in front of the one object to be measured, the guide member is driven by the movement of the other object to be measured. The contact member is moved on the traveling locus of the other DUT, and when the other DUT reaches a predetermined position, the abutment member comes into a state of correctly contacting the other DUT. Therefore, the gap size between the two DUTs can be determined as in the above case.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to 4, case 1 is made of hard magnetic material,
It is made thin (having a height of, for example, about 16 mm) from a box body 5 including a base member 2 formed of a non-magnetic arbitrary material and a side wall 4 surrounding an upper space 3 thereof, and a lid 6. Reference numeral 7 denotes an abutting surface that is in contact with one of the objects 8 to be measured (for example, the upper surface of a lower mold in a mold), and the intermediate portion 9 is recessed. This time 7
Can be brought into close contact with an object made of a magnetic material by a magnet (not shown) built in the box body 5. Reference numerals 10 and 11 denote step portions for supporting the circuit board 12 and the lid 6, 13 denotes a concave portion for fixing the base portion 14a of the fixed iron core 14, and 15 denotes a female screw hole. Lid 6
Is composed of a well-known opaque hard plate 16 and a transparent soft member 17, and is adhered to the step 11.

Reference numerals 18, 19, 20, 21, 22 denote a well-known dimension display unit, a power on / off button, a reset button, a zero set button, and a connector for connecting a remote control switch, respectively.

The circuit board 12 includes circuit elements (an oscillator 23, a counter 24, a linearizer 2 using a CPU) shown in FIG.
5), electric and electronic parts such as switches and batteries are mounted,
The circuit board 12 is fixed to the box 5. Fixed core 14
Is made of magnetic material (permalloy or ferrite material),
It has an inverted T-shaped cross section with an elongated central portion 14b and a base portion 14a wider than the diameter of the surrounding member to prevent magnetic flux leakage. The central portion 14b may be omitted. Coil 26
The axis 27 is orthogonal to the one surface 7 and is relatively elongated so that a large stroke 28 (for example, about 6 mm) can be made. 29 is a bobbin made of insulating material and lower collar 30 is a surrounding member
It has 31 receiving surfaces.

The surrounding member 31 is formed of a conductive material (brass, copper, or the like) into a cylindrical shape (for example, a diameter of about 8 mm) so that the magnetic flux emitted from the coil 26 does not leak to the outside when it is lowered from the position shown in FIG. The upper portion is dimensioned to be higher than the upper surface 26a of the coil 26 so as to surround the magnetic flux coming out from above the coil 26 even at the lowest position. Reference numeral 33 denotes a contact member integrally formed on the upper portion of the surrounding member 31, but it may be formed of a material (non-magnetic) separate from the surrounding member 31 and mechanically connected thereto. Reference numeral 33a denotes a portion for engaging the guide member in the member 33, and exemplifies a receiving portion provided in a ring shape. The engaging portion 33a is provided with an axial center 33c of the member 33 so that an engaging position of one end of the guide member with respect to the corresponding member 33 is preferably formed.
It is a hat-shaped slope as shown so as to be close. 33
b indicates a guide portion between the engaging portion 33a and the distal end portion 33d in the direction opposite to the base member in the member 33, and the other DUT is in front of the DUT as described later. When arriving in a direction parallel to the object to be measured and arriving, the other member to be measured is driven to move the contact member 33 in the direction of the base member. Engagement part
An example of a convex curved surface formed by forming a portion in the direction opposite to the base member from 33a in a spherical shape is shown. 34 is the surrounding member 31
Is a guide member for guiding the base member 2 toward and away from the base member 2. The guide body is formed of a nonmagnetic material in a hollow cylindrical shape, and is fixed to the base member 2 with bolts 32. Numeral 35 denotes a protrusion (a set screw-shaped screw rod) for regulating the vertical range of the surrounding member 31, the tip of which protrudes into a vertically long regulating groove 36 provided on the outer periphery of the surrounding member.
Reference numeral 37 denotes an urging member for maintaining the surrounding member 31 at the upper limit position, which uses a spring made of a non-magnetic material, but may be another elastic member.

Reference numeral 40 denotes a guide member which is normally positioned as shown in FIGS. 2 and 3 and is capable of tilting in the direction of arrow 40a when an external force is applied. For example. The guide member 40 has such a stiffness that the intermediate portion does not buckle due to the urging force of the urging member 37 when tilted in the direction of the arrow 40a by an external force. Reference numeral 41 denotes one end of a guide member, which is formed in a bifurcated shape as shown in the figure for example so as to be tiltable with respect to the contact member 33, and is opposed to the engagement portion 33a while straddling the guide portion 33b. It is. 42 is a guide member
At 40, the other end extending across the side of the outer peripheral side surface 31b of the surrounding member 31 is shown. In the present embodiment, a fixing piece 43 integrally provided by bending at the tip is fixed to the side wall 4 of the box body 5 with a fixing screw 44. For example, the one end 41 can be freely tilted to the contact member 33. When other means for preventing the guide member 40 from falling off, such as connecting to the other end, is required, the other end 42 need not be fixed.

In the above configuration, for example, a gap measuring tool is placed on one surface 8 of the lower die, which is one of the objects to be measured, and one surface 8a of the upper die, which is the other object to be measured, is lowered in the direction of arrow 8b. Then, during the lowering, it hits the distal end portion 33d of the contact member 33 above the surrounding member 31 and descends with it (at the lowest position, the contact member 33 contacts the upper surface of the lid 6 and the lower end 31a of the surrounding member 31).
Is in contact with the lower collar 30 of the bobbin). When the lower surface 8a of the upper mold stops at a predetermined position (a position corresponding to the expected outer shape of the molded product), the gap size between the two is displayed on the display unit 18 and the required measurement is performed.

That is, when the surrounding member 31 is lowered, the magnetic flux from the coil 26 changes as generally known, and the inductance of the coil 26 changes. When this signal is stored in the oscillator 23 as shown in FIG. 5, the transmission frequency changes with the change. Also, the count number of the counter 24 changes accordingly, and the conversion number of the dimension value in the linearizer 25 also changes. As a result, the change value appears in the display window 18.

Next, as shown in FIG. 6A, when measuring the gap size G of the space 55 to select the thickness of the sliding plate 54 to be used, FIG. As described above, the gap measuring device A
Is mounted on the inner surface 53a, which is one of the objects to be measured, by utilizing the adhesion of the contact surface 7 by the magnet, and the upper mold 57 is lowered in the direction of the arrow 58. Then, the side surface 57 of the upper mold 57, which is the other object to be measured,
a travels parallel to the inner surface 53a. In the progressing process, the outer peripheral side surface 31b of the surrounding member 31 as shown in FIGS.
The end 57a 'of the side surface 57a traveling toward
Abut. And the side surface 57a points the guide member 40 to the arrow 40a.
8B, the contact member 33 is moved in the direction of arrow 59, and as shown in FIG. 8B, the contact member 33 is positioned on the traveling trajectory of the side surface 57a. Comes into contact. When the side surface 57a further advances, the guide portion 33b is inclined, so that the driving force in the direction of arrow 59 is received by the end 57a 'of the side surface 57a, and the member 33 further moves in that direction 59. Then, as shown in FIG. 8C, the leading end 33d of the contact member 33 comes to correctly contact the side surface 57a. In this state, the measurement of the required gap size G is performed in the same manner as in the above-described case. In FIG. 6, reference numeral 51 denotes a lower element of the die set, and 56 denotes an upper element.

As shown in FIG. 8B, the center of curvature 60 of the guide portion 33b and the end 33b 'of the guide portion 33b on the engagement portion 33a side.
The intersection angle θ between the straight line 61 connecting the straight line 62 and the straight line 62 parallel to the contact surface 7 may be selected to be about 30 ° or more in order to smoothly drive the contact member 33 in the direction of arrow 59. A smaller angle can be used if the part 33b is, for example, surface-treated to make it slippery better.

In the gap measuring device having the above-described structure, the height H can be made smaller than that of the gap measuring device A 'having the roller 71 as a contact member as shown in FIG. There is. In addition, there is an advantage that the measurement accuracy is improved as compared with the gap measuring tool A ″ having the guide member 72 that covers the contact member 33 as shown in FIG. 15. That is, in the example of FIG.
If the height of the pushed-in position of the member 33 is different, the inclination of the guide member 72 is also different, so that the distance between the distal end portion of the member 33 and the measured object 57a is different, and the difference becomes a measurement error. On the other hand, in the embodiment of the present application, the tip 33
Since d is directly in contact with the measured object 57a, the measurement can always be performed with high accuracy regardless of the height of the pressed position of the contact member 33.

FIGS. 9 to 11 show different embodiments of the structure of the guide member and the structure of one end of the guide member that can be tiltably engaged with the guide member. Steel wire with sufficient waist strength)
The one end 41e of the guide member 40e is inserted through the engaging through hole 64 formed in the member 33e. In such a configuration, the guide portion 33 of the member 33e
be can be a convex shape having a large curvature as compared with the case of using the plate-shaped guide member, and the angle at which the object to be measured coming from the side hits the surface of the guide portion 33be is made gentle. The movement of the member 33e in the direction of the arrow 59e can be smoothed. In addition, portions that are considered to have the same or equivalent configuration as those in the previous figure in terms of function are denoted by the same reference numerals as in the previous figure with the letter e, and redundant description is omitted. (Also, in the following figure, the same concept is applied with alphabetical letters f and g, and redundant description will be omitted.)

12 (A) and 12 (B) show still another embodiment of the structure in which one end of the guide member can be tiltably engaged with the corresponding member, and one end 41f, 41g is connected to the corresponding member 33f, 41g. Three
This shows an example in which one end 41f, 41g is provided with protrusions 65, 66 in order to push a position as close to the axis as possible at 3g.

[0022]

As described above, according to the present invention, the gap measuring device A is placed between the two DUTs 8 and 8a, and the surrounding member 8 and 8a are brought closer to each other. When 31 is driven in the direction of the base member 2 in accordance with the approach dimension, the coil
The magnetic flux 26 receives a change in the positional relationship with the surrounding member 31, and the inductance of the coil 26 changes. By utilizing the change value, a narrow gap dimension between the two objects to be measured 8, 8a can be measured.

In addition, since the surrounding member 31 is formed in a cylindrical shape and is lowered to a position surrounding the coil 26 when approaching the coil 26, that is, the surrounding member 31 is configured to be superposed in the circumferential direction. The advantage is that the stroke 28 'of the surrounding member 31 can be formed large, and a relatively large dimensional change range can be measured.

In addition, when the measured object 8a is extremely close to the measured object 8, the surrounding member 31
Above the coil 26 in a state surrounding the coil 26
Is formed in a hollow cylindrical shape with a conductive material so that the magnetic flux from the sample does not reach the other device under test 8a.
Even if 8a is a magnetic material (made of iron), its magnetic properties do not affect the inductance of the coil 26, and there is also an effect that a normal measurement can always be performed.

Further, according to the present invention, as shown in FIG. 7, one of the measured objects 53a is moved forward of the other of the measured object 53a in the direction of an arrow 58 parallel to the one of the measured objects 53a. In this case, when the gap between the two DUTs 53a and 57a is measured, the other DUT 57a advances toward the outer peripheral side surface 31b of the surrounding member 31 as shown in FIG. Even so, the guide member 40 is driven by the advance of the other object to be measured 57a, and the contact member 33 is moved on the traveling locus of the other object to be measured 57a as shown in FIG. 8B. When the other object to be measured 57a reaches a predetermined position as shown in FIG. 8C, the contact member 33 can be brought into a state of correctly contacting the other object to be measured 57a. Measurement object
There is an effect that the gap between 53a and 57a can be measured.

Further, in this case, since the guide member 40 can be tilted freely, even if the gap between the two DUTs 53a and 57a is narrow, the other DUT 57a is kept at a predetermined position as shown in FIG. When the guide member 40 reaches the position,
There is a feature that it is possible to lie down to a state close to a state parallel to a, and thus it is possible to measure a relatively narrow gap.

[Brief description of the drawings]

FIG. 1 is a plan view of a gap measuring tool.

FIG. 2 is a front view of a gap measuring tool.

FIG. 3 is a cutaway view of the gap measuring tool.

FIG. 4 is a partial cutaway view of a state in which it is placed on the lower mold upper surface in a direction different from that of FIG. 3 by 90 °.

FIG. 5 is a circuit connection diagram.

FIGS. 6A and 6B are diagrams for explaining a gap measurement in a space for a sliding plate.

FIG. 7 is a diagram showing a state in which an object to be measured contacts a guide member in FIG.

FIGS. 8A, 8B, and 8C are diagrams showing a state where an object to be measured moves sequentially.

FIG. 9 is a front view showing a different embodiment of the gap measuring device.

10A is a right side view of the gap measuring device of FIG. 9,
(B) is a cutaway view of a mounting portion of the guide member.

11A is a partially cutaway enlarged view of FIG. 9 showing an engagement portion between the contact member and a guide member, and FIG. 11B is an enlarged plan view of FIG.

FIGS. 12A and 12B are partially cutaway views showing different embodiments of an engaging portion between a contact member and a guide member.

FIG. 13 is a diagram showing a state where an object to be measured is in contact with a surrounding member.

FIG. 14 is a view showing a gap measuring device provided with a roller as a member.

FIG. 15 is a view showing a gap measuring tool provided with a guide member that covers the member.

[Explanation of symbols]

 1 Case 2 Base member 14 Fixed iron core 26 Coil 31 Surrounding member 33 Applicable member

Claims (1)

(57) [Claims] 1. A base member provided with a coil having an inductance which varies according to the distance of a conductive material, and a base member provided with a base member provided with a coil whose inductance changes depending on the distance of a conductive material. The guide member is provided to guide the base member forward and backward with respect to the base member, and the approach is made of a conductive material so that the magnetic flux from the coil does not reach the other DUT while the coil surrounds the periphery of the coil. An enclosing member formed in a hollow cylindrical shape, and the other connected to the enclosing member to move the enclosing member in the base member direction when the other DUT approaches the one DUT. The contact member for contacting the object to be measured, one end of the contact member is tiltably engaged with the contact member, and the other end of the contact member extends obliquely across the side of the outer peripheral side surface of the surrounding member. The other DUT is above A guide which, when arriving parallel to the one object to be measured toward the outer peripheral side surface of the surrounding member, is tilted by the contact of the other object to move the member to the base member side. And a member,
In the member, between the engaging portion with the guide member and the distal end in the direction opposite to the base member, when the other object to be measured arrives in parallel as described above, it is driven by the object to be measured. A gap measuring tool having a slope for moving the contact member in the direction of the base member.