JP5289237B2 - Rebound type hardness tester - Google Patents

Description

  The present invention relates to a rebound type hardness tester for measuring the hardness of a workpiece.

  Conventionally, as a hardness tester that calibrates the hardness tester, an inverted frustoconical friction roller on which a hardness master is placed is intermittently rotated by an intermediate roller whose back is in contact with the roller, and the test impact position is determined. Some are updated one by one for each impact (see, for example, Patent Document 1).

  However, since the intermediate roller is brought into contact with the side surface of the inverted frustoconical friction roller, a sufficient pressure contact force cannot be obtained, and there is a problem that it is difficult to make the rotation amount of the hardness master constant. The hardness master is fed in the radial direction by moving the intermediate roller up and down between the friction roller and the receiving roller. However, the friction roller and the receiving roller are in point contact with the intermediate roller, and slippage is likely to occur. In addition, there is a problem that the feed position fluctuates due to wear of the contact surface.

JP 2009-68933 A

  It is an object of the present invention to provide a rebound type hardness tester that can use the hardness master wastefully by making the rotation amount and the feed amount of the hardness master constant and improving the separation distance accuracy of the test hitting position. It is what.

The present invention provides a rebound type hardness tester for performing a test by performing a test by hitting a hammer by updating the test hitting position on a hardness master having a reference hardness one by one with a separation distance that does not affect the test by a position changing means. In the verification apparatus, the position changing means is a friction wheel that is brought into contact with the bottom surface of the hardness master mounting table to slightly rotate the hardness master mounting table in the circumferential direction, and a single feed that intermittently rotates the friction wheel. A mechanism, a radial feed mechanism that moves the hardness master mounting table by a small distance in the radial direction by the single feed mechanism, and a rotation axis direction conversion mechanism that transmits the rotation of the hardness master mounting table to the radial feed mechanism The rotation axis direction conversion mechanism is a drive pulley formed on the hardness master mounting table, a guide pulley for changing the drive direction, and a feed pump attached to the rotation shaft of the radial feed mechanism. And Li is a test device of the rebound hardness tester, characterized by comprising a wound feedrate belt and pulley feed drive pulley through said guide pulley.

  In addition, it is good also as what provided the cancellation | release mechanism which cancels | releases engagement of the ratchet of a single feed mechanism, and a drive nail | claw.

  Further, the radial feed mechanism includes a rotary shaft that is rotated by a feed pulley of a rotary shaft direction conversion mechanism that transmits the rotation of the hardness master mounting table, a feed screw formed at a distal portion of the rotary shaft, and the feed It may be composed of a fixed female screw that is screwed into the screw.

  Moreover, it is good also as what provides the brake mechanism which stops the motion of a hardness master mounting base.

The present invention provides a friction wheel in which the position changing means is brought into contact with the bottom surface of the hardness master mounting table to slightly rotate the hardness master mounting table in the circumferential direction, and a single feed for rotating the friction wheel intermittently. Since the mechanism and the radial feed mechanism that moves the hardness master mounting table by a small distance in the radial direction by the single feed mechanism, the operations different in the circumferential direction and the radial direction are separated. In addition to a highly reliable mechanism with high positional accuracy, the friction wheel and feed mechanism are linked to each other based on the operation of the one-stroke feed mechanism, so the circumferential and radial directions can move simultaneously, allowing quick verification. It can be moved to the striking position. In addition, since the separation distance of each test hitting position is always constant, the test surface of the hardness master can be used effectively without waste, and the running cost can be reduced. The rotation axis direction conversion mechanism is driven via the drive pulley formed on the hardness master mounting table, a guide pulley for changing the drive direction, a feed pulley attached to the rotation shaft of the radial feed mechanism, and the guide pulley. By including the feed belt wound around the pulley and the feed pulley, the circumferential rotation of the hardness master mounting table is reliably and smoothly converted into the radial movement of the hardness master mounting table.

  Further, as described in claim 2, by providing a release mechanism for releasing the engagement between the ratchet of the single feed mechanism and the driving claw, the hardness master mounting table can be easily returned to the initial position.

Furthermore, as described in claim 4 , by providing a brake mechanism that stops the movement of the hardness master mounting table, the shaking of the hardness master can be reliably suppressed at the time of hitting, so that the verification accuracy can be increased.

It is a partially cutaway front view showing an embodiment of the present invention. It is also a plan view. Similarly, it is a left side view. Similarly, it is a right side view. Similarly, it is a partially cutaway plan view.

Next, an embodiment of the present invention will be described in detail with reference to FIGS.
In FIG. 1, reference numeral 1 denotes an inspection device incorporating a rebound type hardness tester for performing an impact test on a hardness master 2 having a reference hardness. The verification device 1 sequentially sets the test impact points with a separation distance that does not affect the test. It comprises a position changing means 3 for the hardness master 2 to be updated, and a repulsive hardness meter 4 capable of disposing a hammering hammer 4a on either the workpiece or the hardness master 2.

  As shown in FIGS. 1 and 5, the position changing means 3 is driven by a single feed mechanism 5 to intermittently rotate the hardness master mounting table 6 by a certain distance in the circumferential direction, and a hardness master. A rotating shaft direction converting mechanism 8 that transmits the intermittent rotation of the mounting table 6 to a radial feed mechanism 9 to be described later, and a radial direction in which the hardness master mounting table 6 is moved by a small distance in the radial direction by the rotating shaft direction converting mechanism 8. And a feed mechanism 9.

  As shown in FIG. 2, the test hammering position of the hammer 4a is changed in the circumferential direction by moving the hardness master 2 by a small distance in the radial direction while rotating slightly by a certain distance in the circumferential direction intermittently by the position changing means 3. And it becomes a spiral shape of equal intervals in the radial direction.

  As shown in FIGS. 1 and 5, the single feed mechanism 5 includes a ratchet drive cylinder 12 attached to a frame 10 a erected on the base 10 via a rotating plate 11, and a rod tip of the ratchet drive cylinder 12. The drive claw 12a made of a spring attached to the frame, the rotatable ratchet 13 fixed to the frame 10a, the locking groove 13a formed on the outer peripheral surface of the ratchet 13, and the drive that retreats when the drive claw 12a is retreated. It consists of a follow-up prevention spring 14 that prevents the ratchet 13 from rotating backward by the claw 12a.

  Reference numeral 17 denotes a fixing screw for locking the pivotable rotation plate 11 which is pivoted at one end. Reference numeral 18 denotes a manual handle provided on the ratchet 13. The manual handle 18 is replaced with the hardness master 2 when the hardness master 2 is replaced. In order to return the mounting table 6 to the initial position, the ratchet 13 is reversely rotated. When the ratchet 13 is reversely rotated, it is necessary to release the pressing force of the driving claw 12a and the accompanying prevention spring 14 that are engaged in the locking groove 13a of the ratchet 13, and therefore the fixing screw 17 is loosened and the rotating plate 11 is moved. It is pivoted to unlock the drive claw 12a and the pressing of the follower prevention spring 14 is released.

  Further, as shown in FIG. 1, the friction wheel 7 passes through the base 20c of the hardness master mounting table 6 orthogonally, and in addition to the rotating shaft 13b of the ratchet 13 that is stretched between the frame 10a and the bearing 10b. It is attached to the end and is in contact with the bottom surface of the hardness master mounting table 6. Reference numeral 7a denotes a friction ring provided on the peripheral surface of the friction wheel 7, and the friction ring 7a contacts the friction surface of the iris knurl formed on the bottom surface of the hardness master mounting table 6 so as not to cause a slip. 6 is slightly moved in the circumferential direction by a certain distance.

  The axial direction of the rotating shaft 13b is the moving direction of the hardness master mounting table 6. Reference numeral 7c denotes a pressure spring that presses the friction wheel 7 against the bottom surface of the hardness master mounting table 6. The friction wheel 7 slips due to the pressure spring 7c and the friction surface to cause a shift in the movement amount of the hardness master mounting table 6. I am trying not to. The pressure spring 7c is attached to the bottom of the bearing 10b.

  Further, as shown in FIG. 1, the rotation axis direction conversion mechanism 8 includes a drive pulley 6 c formed on the hardness master mounting table 6, a feed pulley 21 attached to the rotation shaft 8 b of the radial direction feed mechanism 9, and a feed It comprises a guide pulley 22 that changes the direction of the belt 23, and a feed belt 23 that is wound around the drive pulley 6c and the feed pulley 21, and converts horizontal rotation into vertical rotation.

  Further, as shown in FIG. 1, the radial feed mechanism 9 is orthogonal to the linear guide 20 that makes the base 20 c of the hardness master mounting table 6 slidable in the radial direction and the base 20 c of the hardness master mounting table 6. The rotating shaft 8b that is fixed in the shaft, the feed screw 8a that forms the tip of the rotating shaft 8b, the feed pulley 21 of the rotating shaft direction changing mechanism 8 that is attached to the intermediate portion of the rotating shaft 8b, and the feed It consists of a female screw 30 screwed into the screw 8a and fixed to the frame 10a. The linear guide 20 includes a rail 20a laid on the base 10 and a linear guide block 20b which is engaged with the rail 20a and has a base 20c erected.

  Further, as shown in FIG. 1, the repulsive hardness meter 4 is provided with a trigger button 4b at the upper end, and the trigger button 4b is energized to perform a striking operation of the striking hammer 4a when performing a test hit. The trigger spring is released manually or with a cylinder or the like.

  Reference numeral 25 denotes a brake mechanism. The brake mechanism 25 includes a pad 25a and a cylinder 25b pressed against the bottom surface of the hardness master mounting table 6, and stops the shaking of the hardness master mounting table 6 at the time of test hitting to improve verification accuracy. Is.

  What is constituted in this way measures the hardness of the workpiece by the repulsive hardness meter 4 on the workpiece conveyed by the conveyor, and the number of measurements reaches, for example, 100 times or the hardness of the workpiece is measured for one day. Then, the rebound type hardness meter 4 is moved to the verification device 1 arranged in parallel with the conveyor, the hammer 4a of the repulsion type hardness meter 4 is brought into contact with the verification surface of the hardness master 2 of the verification device 1, and the trigger button By operating 4b, the hammer 4a performs a test hammer on the hardness master 2 having the reference hardness. The rebound type hardness tester 4 is calibrated based on the detected value by the test hit so that the hardness measurement value does not change.

  After the calibration, the rebound hardness meter 4 is again moved to the workpiece position on the conveyor, and the workpiece hardness measurement is repeated. When the number of workpiece hardness measurements reaches a predetermined number or when one day of work is completed, the rebound type hardness tester 4 is again moved onto the hardness master 2 of the test device 1 to perform a test hit. The position of the hardness master 2 and the hammering hammer 4a are the same as the previous test hammering position, and the impression by the hammering hammer 4a remains. Move and update by distance.

  The renewal movement of the hardness master mounting table 6 to which the hardness master 2 is attached by the renewal movement means 3 operates the ratchet drive cylinder 12 of the single feed mechanism 5 to engage the locking groove 13a of the ratchet 13. Is advanced, the locking groove 13a of the ratchet 13 is rotated by one tooth.

  As the ratchet 13 rotates, the rotating shaft 13a rotates, so the friction wheel 7 also rotates, and the hardness master mounting table 6 rotates by a certain distance. As the hardness master mounting table 6 rotates, the drive pulley 6c also rotates, the feed pulley 21 rotates through the feed belt 23, and the feed screw 8a rotates. Since the feed screw 8a is screwed into the female screw 30 fixed to the base 10 and is fixed to the base 20c, the hardness master mounting table 6 and the feed pulley 21 move in the radial direction.

  Then, the rebound type hardness tester 4 is calibrated on the basis of the measured value by calibrating the hardness master 2 by activating the trigger button 4b at the new calibrated impact position and performing the calibrated impact on the hardness master 2 by the impact hammer 4a biased by the trigger spring. Therefore, the workpiece hardness can be always accurately measured.

1 Testing device
2 Hardness master 3 Position change means 4 Rebound type hardness tester
4a blow hammer
4b Trigger button 5 Single feed mechanism 6 Hardness master table
6c Drive pulley 7 Friction wheel
7a Friction ring
7c Pressure spring 8 Rotating shaft direction conversion mechanism
8a Lead screw
8b Rotating shaft 9 Radial feed mechanism
10 base
10a frame
10b bearing
11 Rotating plate
12 Ratchet drive cylinder
12a Driving claw
13 Ratchet
13a Locking groove
13b Rotating shaft
14 Anti-rotation spring
17 Fixing screw
18 Manual handle
20 Linear guide
20a rail
20b Linear guide block
20c base
21 Feed pulley
22 Guide pulley
23 Feed belt
25 Brake mechanism
25a pad
25b cylinder
30 Female thread

Claims (4)

In a rebound type hardness tester that performs a test by performing a test with a hammer and renewing the test hit position on the hardness master having the reference hardness one by one with a separation distance that does not affect the test by the position changing means, A position change means, which is in contact with the bottom surface of the hardness master mounting table, rotates the hardness master mounting table a little by a certain distance in the circumferential direction; a one-wheel feed mechanism that intermittently rotates the friction wheel; It consists of a radial feed mechanism that moves the hardness master mounting table by a small distance in the radial direction by a single feed mechanism, and a rotation axis direction conversion mechanism that transmits the rotation of the hardness master mounting table to the radial feed mechanism. A driving pulley in which the axial direction conversion mechanism is formed on the hardness master mounting table, a guide pulley for changing the driving direction, a feed pulley attached to the rotary shaft of the radial feed mechanism, Guided over pulleys, characterized in that it consists of a wound feedrate belt and a pulley and feed drive pulley rebound type hardness meter test device.   The rebound hardness tester according to claim 1, further comprising a release mechanism for releasing the engagement between the ratchet of the single feed mechanism and the driving claw.   A radial feed mechanism includes a rotary shaft that is rotated by a feed pulley of a rotary shaft direction conversion mechanism that transmits the rotation of the hardness master mounting table, a feed screw formed at a tip portion of the rotary shaft, and a feed screw The rebound type hardness tester according to claim 1 or 2, comprising a fixed female screw to be screwed. The rebound type hardness tester according to any one of claims 1 to 3, further comprising a brake mechanism for stopping the movement of the hardness master mounting table .

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