JP2005249431A - V-block apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measuring apparatus which can obtain precise measuring accuracy by manual work of an operator, without generating wear of a V-groove surface of a V-block for measuring a shake (displacement amount) of an object to be measured such as a drill. <P>SOLUTION: At least two rotational bodies capable of freely being rotated are disposed opposite each other in the V-groove so that the outer surfaces thereof project from the surface of the V-groove of the V-block 1. A press holding mechanism T for rotatably pressing, toward the V-block 1, the object 50 to be measured consisting of a drill holder 40 to which the drill 44 is mounted and which is supported by the V-block 1 is provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is, for example, used to measure the deformation amount of the shape of an object to be measured in order to inspect so-called runout of a cutting tool such as a drill used for machining or deformation of a roll-shaped machine part. The block device.

  In machining, a cutting tool such as a drill used for cutting a workpiece is replaced for re-polishing due to wear of a cutting edge or the like. The replaced cutting tool, such as a drill, is repaired and adjusted in addition to re-grinding the cutting edge. At that time, in order to inspect whether repair or adjustment is necessary, for example, when measuring or measuring a so-called runout (deformation amount) of the cutting tool or shank of the cutting tool after regrinding, conventionally, the cutting tool By supporting the cylindrical tool holder with a V-block in a V-block fixed on the surface plate, the dial gauge pointer is applied to the cutting tool while turning the tool holder manually. We measure the runout such as.

  Such a measuring apparatus that measures the deformation amount (vibration) of the shape of the object to be measured including the above-described cutting tool and roll-shaped mechanical parts by using a V-block and a dial gauge is already known. For example, the measuring apparatus described in Patent Document 1 supports the object to be measured, which is a cutting tool, by directly contacting the V groove of the V block, and manually rotates the object to be measured with one hand. It is configured to measure while.

Separately from this, for example, as shown in FIG. 5, the measuring device described in Patent Document 2 includes two V blocks 103 and 103 including a pair of bearings 104 and 104 arranged outside the V block. A dial gauge is used to rotatably support both ends 102 and 102 of the object to be measured 101, and the operator turns the object to be measured 101 with one hand while measuring the amount of deformation (shake) between the both ends of the object to be measured 101. 105 is configured to inspect and measure.
Japanese Utility Model Application No. 58-170061 (microfilm of Japanese Utility Model Application No. 60-78248) (pages 10-13, FIGS. 5-6) JP-A-5-240609 (paragraphs 0002 to 0004, FIG. 9)

  In the measuring apparatus described in Patent Document 1, measurement is performed by causing the V groove of the V block to directly contact the object to be measured, and simultaneously rotating the object to be measured while holding the measuring apparatus with one hand of the measurer. As a result of continuous use, wear occurs on the V groove surface, which is the reference surface of the V block. When such wear occurs, rotational resistance and rotational unevenness on the object to be measured increase, making it difficult for the operator to perform a rotating operation with one hand, and sometimes the object to be measured is V-grooved due to friction during the rotating operation. There is a problem that an accurate measurement value for the object to be measured cannot be obtained due to the influence of the wear of the V-groove surface. In addition, when the object to be measured has a large-diameter stepped part or a collar part, if these parts slide in contact with the side surface of the V block, the portion of the side surface of the V block that comes in sliding contact wears in an annular shape. There arises a problem that rotation resistance and rotation unevenness are further increased.

  Further, in the measuring apparatus 100 that is rotatably supported by a pair of bearings 104 and 104 arranged on the outer sides of the two V blocks 103 and 103 described in Patent Document 2, the object to be measured 101 is supported by the bearings 104 and 104. Therefore, measurement errors due to wear of the V blocks 103 and 103 can be prevented. However, in the case of the measured object 101 having a predetermined length such as a drill, the measurer rotates the measured object 101 by hand to measure the amount of eccentricity. There is a problem in that an error is likely to intervene due to the adjustment, and the measurement accuracy of the shake may be lowered.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems, and to measure the deflection of a measured object such as a drill with a measuring instrument such as a dial gauge, between the measured object such as a drill and the V groove of the V block. The measurement object is supported by the V block in such a way as to reduce rotational resistance and rotation unevenness so that wear due to direct contact does not occur at the same time, and measurement error due to pressing and turning of the measurement object manually by the measurer It is an object of the present invention to provide a novel measuring apparatus that can obtain a precise measurement accuracy by devising the attachment of a holding mechanism so as to eliminate the influence of interposition.

Means taken in order to solve the above-mentioned problems are as follows.
The V block device according to claim 1 is a V block device that supports the object to be measured in order to measure the shake of the object to be measured by a measuring instrument, and its outer surface protrudes from the surface of the V groove of the V block. In this way, at least two pairs of rotatable rotating bodies are provided in the groove provided in the V-groove so as to face each other, and the holding member presses the object to be measured supported by the rotating body toward the V-block. A mechanism is provided.

  According to a second aspect of the present invention, the V block device according to the first aspect is configured such that the pressing and holding mechanism is provided with a rotating body that rotatably contacts the object to be measured.

  According to a third aspect of the present invention, the V block device according to the first and second aspects is configured such that a rotatable rotating body is provided at the bottom of the V groove of the V block so that the outer surface protrudes from the side surface of the V block. .

  According to a fourth aspect of the present invention, in the V-block device according to the second or third aspect, the rotating body that rotatably contacts the object to be measured of the press-holding mechanism is at the intermediate position in the width direction of the V-block. It was set as the structure which presses a measurement object.

  According to the first aspect of the present invention, since the object to be measured is supported by the V block with a pair of freely rotatable bodies, the wear of the V block can be prevented and the object to be measured is stably supported. be able to. As a result, when measuring the vibration of the object to be measured with the measuring instrument, it is easy to manually rotate the object to be measured, and it is possible to perform accurate measurement with high accuracy and no error. For this reason, there is an advantage that the smooth polishing correction work for the V groove surface serving as the reference surface of the V block, which has conventionally been performed once every six months, becomes unnecessary. In addition, by applying a constant pressing force by the pressing and holding mechanism, it is possible to reduce the rotation unevenness during the rotating operation on the object to be measured, so that it is possible to perform a stable shake measurement operation regardless of the years of experience. Further, as the measurement accuracy of the deflection increases, there is an advantage that the quality of the measurement object such as a drill is improved. Furthermore, since the shake measurement operation can be carried out stably, the work load on the measurer is reduced.

  According to the invention of claim 2, since the object to be measured is pressed against the V block by the rotatable rotating body provided in the pressing holding mechanism, when measuring the vibration of the object to be measured such as a drill with the measuring instrument, It is easy to manually rotate the object to be measured, and it is possible to perform accurate measurement without error.

  According to the invention of claim 3, since the rotating body is provided so as to protrude from the side surface of the V block, the rotation due to wear of the side surface of the V block can be achieved even when the object to be measured has a large-diameter step portion or a flange portion. Resistance generation and rotation unevenness can be prevented, and a smooth rotation can be given to the object to be measured, so that the measurement accuracy can be further improved.

  According to the invention of claim 4, the object to be measured is pressed at a substantially intermediate position in the width direction of the V block by the rotating body that rotatably contacts the object to be measured of the pressing holding mechanism. Can be stably held in the V block, so that a higher measurement accuracy of vibration can be obtained and a more stable measurement operation can be performed.

  Next, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings to be referred to, FIG. 1 is a conceptual diagram for measuring an object to be measured using the V block device according to the embodiment. FIG. 2 is an explanatory diagram illustrating a configuration of the V block device according to the embodiment. FIG. 3 is an explanatory diagram of a V block according to the embodiment. FIG. 4 is an explanatory diagram of an object to be measured that is applied to the measurement of the V block device.

(Outline of V block device)
As shown in FIG. 1, the V block device 10 of the present embodiment is mainly composed of a V block 1 and a toggle clamp T as a press holding mechanism attached to the V block 1. An object to be measured 50 is rotatably supported on the V block 1. A detailed structure for rotatably supporting the DUT 50 will be described later. The DUT 50 is configured to be supported in a state of being pressed toward the V block 1 by a pressing pad 13 of a toggle clamp T described later. The DUT 50 includes a single drill 44 or a drill 44 attached to the drill holder 40. Along with the V block device 10, a dial gauge 60 as a measuring instrument is disposed on the surface plate A. The dial gauge 60 is used to measure the deflection of the object to be measured 50 such as the drill 44 attached to one end of the drill holder 40 supported by the V block 1.

(V block structure)
As shown in FIG. 2, the V block 1 includes a V groove surface 1a, 1a ', a V groove bottom 1b, side surfaces 1c, 1c', end surfaces 1e, 1e 'and a bottom surface provided at the center of the upper surface 1d. It has become. The V block 1 is fixed to the surface plate A (see FIG. 1) by hexagon socket bolts (not shown) inserted into bolt holes 17 and 17 (see FIG. 3) provided at both ends of the upper surface 1d. ing. Two slits (grooves) 1s and 1s are formed on the opposing V groove surfaces 1a and 1a ′ from the upper surface 1d of the V block 1 to the V groove bottom 1b, respectively. Each slit 1s formed in the V-groove surfaces 1a and 1a ′ is provided with bearings 3 and 3 ′ as rotating bodies. The bearings 3 and 3 'are supported by rotating shafts 2 and 2 that are inserted into shaft holes provided in the side surfaces 1c and 1c' of the V block 1, and are partially outer peripheral surfaces of the bearings 3 and 3 '. Are arranged so as to protrude from the V-groove surfaces 1a and 1a ′. In this case, the protrusion amount of the outer peripheral surface of the bearings 3 and 3 ′ is set to be about 2.0 mm. Accordingly, the drill holder 40 is configured to be rotatably supported by bearings 3 and 3 ′ provided so as to protrude from the V groove surfaces 1 a and 1 a ′. In the present embodiment, the grooves in the claims are described by the slits 1s and 1s.

  On the side surface 1c of the V block 1, a part outer peripheral surface of a bearing 3a rotatably mounted on a rotating shaft 2a (see FIG. 3) suspended from the V groove bottom 1b protrudes from the side surface 1c. It is arranged to become. Thereby, the end face of the collar part 42 (see FIG. 4) described later of the drill holder 40 is rotatably supported by a part of the outer peripheral surface of the bearing 3a provided so as to protrude from the side face 1c. It is comprised so that it may not contact directly with 1c. Note that the bearing 3a is open to the side surface 1c so that it does not interfere with the drill holder 40 supported on the V-groove surfaces 1a and 1a ', and the recess 3h that is slightly recessed from the V-groove bottom portion 1b is formed in the V block. It is good to form in 1 and arrange | position in it. A screw 5 (see FIG. 3) provided on the side surface 1c of the V block 1 is for fixing the rotating shaft 2a on which the bearing 3a is mounted. Although not shown, the rotating shaft 2a is formed in a stepped structure with a shaft hole through which the rotating shaft 2a is inserted, and an ring 3a attached to the rotating shaft 2a has a washer that is screwed into the head of the rotating shaft 2a. It is good to fix and fix with screws. Although not shown, the rotary shafts 2 and 2 are fixed with screws provided on the V-groove surfaces 1a and 1a '.

  An attachment block 7 for integrally attaching the toggle clamp T is disposed at one end (left side in FIG. 2) of the upper surface 1d of the V block 1. The mounting block 7 is fixed to the upper surface 1d of the V block 1 by hexagon socket bolts 8 and 8, and a toggle clamp T is attached to the mounting block 7 by bolts.

(Toggle Clamps)
In the present embodiment, an example in which a toggle clamp T is applied as the pressing and holding mechanism will be described. As shown in FIG. 2, the toggle clamp T includes a substrate 30 having a fixing plate 31 attached to the attachment block 7, a clamp arm 26 that presses a drill holder 40 (see FIG. 1), a clamp body 21, and an auxiliary link 22. And a toggle mechanism consisting of The fixing plate 31 is attached to the attachment block 7 with bolts. The clamp arm 26 is formed of two L-shaped plate members. The clamp main body 21 having the operation unit 20 at one end is connected to a clamp arm 26 having a pressing pad 13 at the tip and a support shaft 23 so as to be rotatable with respect to each other. The clamp body 21 and the substrate 30 are connected to each other by an intermediate shaft 24 and a base shaft 25 via an auxiliary link 22 so as to be rotatable. Similar to the clamp arm 26, the auxiliary link 22 is formed of two plates. The clamp arm 26 is rotatably connected to the substrate 30 by a fixed shaft 32. The toggle clamp T is integrally coupled to the V block 1 by fixing a fixing plate 31 provided on the side edge of the substrate 30 to the mounting block 7 with bolts.

  As the operation unit 20 is moved up and down, the clamp arm 26 rotates about the fixed shaft 32 in the vertical direction via the link, thereby applying a pressing force to the drill holder 40 (see FIG. 1). Or it operates to cancel. Between the two clamp arms 26, 26, a pressing pad 13 is attached by pad mounting bolts 11 via abutting plates 18, 18 arranged vertically. The pad mounting bolt 11 for mounting the pressing pad 13 is disposed in a state in which the bolt head of the hexagonal hole faces down and the threaded portion faces upward. Anti-rotation grooves are formed in the upper and lower contact plates 18, 18, and the holding pad 13 is firmly fixed to the clamp arm 26 by tightening the fixing nut 12 and the holding fixing nut 16. A cushion rubber or O-ring 15 having an appropriate thickness is provided between the pressing pad 13 and the pressing fixing nut 16 so as to absorb an impact load and the like. The length dimension between the clamp arm 26 and the pressing pad 13 can be finely adjusted or widened by moving the positions of the fixing nut 12 and the fixing nut 16 up and down.

  Two bearings 13c and 13c that contact the drill holder 40 (see FIG. 1) are arranged in parallel in the groove 13a on the press pad 13 below. The head of the pad mounting bolt 11 is fitted into a recess 13 b formed at the center of the bottom surface of the pressing pad 13. The bearings 13c and 13c are mounted in such a manner that a part of the outer peripheral surface protrudes from the groove 13a of the pressing pad 13. In this case, the protrusion amount of the outer peripheral surface of the bearings 13c and 13c is set to be about 2.0 mm. With this configuration, the pressing pad 13 presses (clamps) the drill holder 40 supported by the V block 1 so as to be rotatable by the two bearings.

  In this embodiment, the pressing pad 13 is described as having a structure in which two bearings 13c are arranged side by side. However, the present invention is not limited to this, and may have a structure without a bearing. For example, it is good also as a structure which formed the surface contact | abutted with the drill holder 40 of the press pad 13 in linear form or concave shape. If the holding pad 13 having the bearings 13c and 13c is arranged at a substantially intermediate position in the width direction of the V block 1, the object to be measured 50 is more stably pressed and held by the bearings 13c and 13c. (See FIG. 1).

As shown in FIG. 1, the toggle clamp T operates to press the drill holder 40 with the pressing pad 13 via the clamp arm 26 when the operation unit 20 is pressed down. When the clamp arm 26 is pressed against the drill holder 40, as shown in FIG. 2, the toggle mechanism is configured so that the base shaft 25, the intermediate shaft 24, and the support shaft 23 are in a clamp position where the substantially straight deadline DL is formed. Yes.
In this clamp position, even if the operator releases his hand from the operation unit 20, the clamp state is continuously maintained by this toggle mechanism. Thereby, the operator can measure the deflection of the drill 44 with the dial gauge 60 while easily rotating the drill holder 40 with one hand operation.

  When the collar portion 42 (see FIG. 4) is formed on the drill holder 40, the side surface 1c of the V block 1 is formed by the bearing 3a disposed on the side surface 1c of the V block 1 as shown in FIG. The end face of the collar part 42 is received. Thereby, it is comprised so that the friction by a direct contact may generate | occur | produce between the side surface 1c of the V block 1, and the collar part 42. FIG. Also on the side surface 1c of the V block 1, the protruding amount of the outer periphery of the bearing 3a from the side surface 1c of the V block 1 is set to be about 2.0 mm as described above.

  The toggle clamp T is in a state of pressing and holding the drill holder 40 which is a holder of the pressing pad 13 at a position where the operation unit 20 shown in FIGS. 1 and 2 is pressed down. At this time, the clamp body 21 connected to the substrate 30 via the auxiliary link 22 and the clamp arm 26 directly connected to the substrate 30 are substantially linear, and the position of the intermediate shaft 24 is the base shaft 25 and the support shaft 23. Are set so as to be slightly shifted downward from the deadline DL (see FIG. 2) connecting the two. Thereby, in this clamp state, even if an operator releases a hand from the operation part 20, the clamp arm 26 is comprised so that it may not return by reaction force and the press holding state of the drill holder 40 may be maintained.

  The pressing force of the drill holder 40 by the pressing pad 13 is adjusted by adjusting the tightening position of the fixing nut 12 and the pressing fixing nut 16 screwed to the pad mounting bolt 11 or by adjusting the number of the pressing fixing nuts 16. Do. For this reason, also when exchanging the drill holder 40 which is a holder for various sizes, it is performed by adjusting the attachment length of the pad attachment bolt 11 in the same manner. Thereby, an optimal pressing force can be applied to the drill holder 40.

  In the pressing release operation of the toggle clamp T, when the operation unit 20 is pulled upward from the position indicated by the solid line in FIG. 2 to the position indicated by the two-dot chain line, the clamp body 21 rotates about the fixed shaft 32, As a result, the intermediate shaft 24 is pulled upward and separated from the deadline DL of the toggle mechanism that connects the base shaft 25 and the support shaft 23. At the same time, the support shaft 23 of the clamp body 21 rotates counterclockwise with the fixed shaft 32 as a fulcrum, so that the operation unit 20 is pulled upward and the toggle clamp T can be held at the clamp release position. As the operation unit 20 is pulled up, the clamp arm 26 connected to the clamp body 21 and the support shaft 23 is also rotated counterclockwise around the fixed shaft 32 and lifted upward. The holding pad 13 provided in the upper part is moved upward. Thereby, the press holding state of the drill holder 40 is released from the V block 1, and the drill holder 40 is supported at a press releasing position where the drill holder 40 is detachable. If the mounting hole for the base shaft 25 of the auxiliary link 22 is formed as a long hole, the toggle mechanism can be smoothly rotated, so that the toggle clamp T can be operated more easily.

(Measurement of measured object)
Next, a method for measuring the shake of the DUT 50 using the V block device 10 of the present embodiment will be described with reference to FIGS. In the present embodiment, the object to be measured 50 is described as the drill 44 mounted on the drill holder 40. However, the drill 44 alone may be measured using the V block device 10 without using the drill holder 40. It can be operated in a similar manner.
First, the V block device 10 is fixed on the surface plate A through hexagon socket bolts (not shown) through bolt holes 17 and 17 (see FIG. 3) (see FIG. 1). Then, the drill holder 40 is supported by the V block 1 with the toggle clamp T held at the clamp release position indicated by the two-dot chain line in FIG. Then, after the drill holder 40 is supported by the V block 1, the operation unit 20 is pulled down. As the clamp body 21 is lowered by the operation unit 20, the holding pad 13 provided at the tip of the clamp arm 26 is rotated downward, and the holding bearings 13 c and 13 c as rotating bodies are attached to the cylindrical portion 41 of the drill holder 40. Abut. Thereby, the drill holder 40 can be stably pressed firmly and held on the V block 1. In this case, since the drill holder 40 is rotatably supported by the bearings 3 and 3 ′ with respect to the V block 1, wear due to direct contact between the drill holder 40 and the V block 1 does not occur.

  After the drill holder 40 is held on the V block 1 by the toggle clamp T, the drill holder 40 is stably held on the V block 1 even when the operator releases his hand from the operation unit 20. The operator can easily prepare for a measuring device such as the dial gauge 60. In the measurement work, when measuring the deflection (deformation amount) of the drill 44 attached to the drill holder 40, the operator can easily rotate the drill holder 40 with one hand operation. In this case, even if the flange portion 42 of the drill holder 40 is brought close to the side surface 1c of the V block 1 by the rotation operation, the bearing 3a receives the end surface of the flange portion 42 so as to be rotatable, so There is no contact and no wear due to direct contact. Therefore, since the drill holder 40 is rotatably supported by each bearing, stable measurement data can be obtained without difficulty, so that highly accurate and precise measurement can be performed. Further, if the holding pad 13 of the toggle clamp T is arranged so as to rotatably clamp the object 50 to be measured by the bearings 13c, 13c at a substantially intermediate position in the width direction of the V block 1, a more stable covering is achieved. Along with holding the measurement object 50, it is possible to perform a more accurate measurement.

  The present invention is not limited to the contents described in the above embodiments, and can be appropriately changed without departing from the technical idea described in the claims of the present invention. For example, the pressing and holding mechanism is not limited to the toggle clamp, and may be a clamping device using another link mechanism. The object to be measured is not limited to a cutting tool such as a drill, but may be a cylindrical body, a cylindrical body with a step or a hook, or a roll-shaped mechanical part. Furthermore, as for the protruding state of the rotating body, the outer peripheral surface of the rotating body such as a bearing may protrude from the V groove surface or the side surface of the V block, and the protruding dimension is not particularly limited. The rotating body may be one whose outer periphery is coated with a wear-resistant elastic material such as hard rubber or synthetic resin. In this case, a rotating body such as a bearing can be used by appropriately replacing it.

It is a conceptual diagram which measures a to-be-measured object using the V block apparatus which concerns on embodiment. It is explanatory drawing which shows the structure of the V block apparatus which concerns on embodiment which concerns on embodiment. It is explanatory drawing of the V block which concerns on embodiment. It is explanatory drawing of the to-be-measured object applied to the measurement of a V block apparatus. It is explanatory drawing of the conventional V block apparatus.

Explanation of symbols

1 V block 1a, 1a 'V groove surface 1b V groove bottom 1c, 1c' Side surface 1s, 1s Slit (groove)
3, 3 ', 3a Bearing (Rotating body)
7 Mounting Block 10 V Block Device 11 Pad Mounting Bolt 12 Fixing Nut 13 Holding Pad 13c Holding Bearing (Rotating Body)
16 Pressing and fixing nuts 18 and 18 Contact plate 20 Operation unit 21 Clamp body 22 Auxiliary link 23 Support shaft 24 Intermediate shaft 25 Base shaft 26 Clamp arm 30 Substrate 31 Fixing plate 32 Fixed shaft 40 Drill holder 41 Cylindrical portion 42 Gutter portion
43 Chuck part 44 Drill 50 DUT 60 Dial gauge (measuring instrument)
A Surface plate T Toggle clamp (Pressure holding mechanism)
DL deadline

Claims (4)

A V-block device for supporting the object to be measured in order to measure the vibration of the object to be measured by a measuring instrument,
A pair of rotatable rotators is provided in the groove provided in the V groove so that the outer surface protrudes from the surface of the V groove of the V block, and the rotator is supported by the rotator. A V-block device comprising a pressing holding mechanism that presses an object to be measured toward the V-block. The V block device according to claim 1, wherein the pressing and holding mechanism includes a rotating body that rotatably contacts the object to be measured. The V block device according to claim 1 or 2, wherein a rotatable body is provided at a bottom of the V groove of the V block so that an outer surface of the V block protrudes from a side surface of the V block. The rotating body that rotatably contacts the object to be measured of the pressing and holding mechanism presses the object to be measured at a substantially intermediate position in the width direction of the V block. The V-block device described.

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