JP2005351874A - Inspection system of axial tension for bolt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a proof load test system which can perform axial tension proof load tests for all machine bolts, at the same time as with screw rolling, and with ease and quickness. <P>SOLUTION: This test system is provide with a screw roller 1, which uses rolling to form a screw section B1 on top of the machine bolt B, and a proof loading mechanism 8 which pulls up the head B2 of the machine bolt B, to apply a constant proof load between the head B2 and the screw section B1, and determines whether it passes the proof load test. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an axial force ensuring bolt inspection system that ensures the mechanical properties of precision bolts.

  Conventionally, as an inspection method to ensure the mechanical properties of precision bolts, out of a number of head bolts manufactured and accommodated in the case, several head bolts are taken out from the case, and the head that has been taken out is removed. The number of head bolts out of the attached bolts was inspected to pass the guaranteed load test. For example, out of 10 head bolts that were rejected were accommodated in the case. The remaining head bolts are also considered to pass this test, and if there are 3 or more head bolts that fail, the remaining head bolts housed in the case will also be rejected. It is considered to be discarded. In that case, as a secure load test of the axial force securing bolt, for example, as shown in FIG. 8, two headed bolts B are inserted into the through holes 31a and 32a of the support members 31 and 32, and then the tip of the headed bolt B is inserted. A nut N is screwed onto the screw part B1 to fix the head bolts B to the two support members 31 and 32, and then a head load B2 and a cylindrical part B3 are loaded by applying a security load to the head bolts B in the axial direction. And whether or not a break occurs at the base portion between the head B2 and the screw portion B1, and if the break occurs, it is regarded as a rejected product.

Problems to be solved by the invention

  However, in the inspection system for the axial force guarantee bolt described above, only a small number of head bolts out of the head bolts housed in the case have been subjected to a guaranteed load test. The remaining head bolts were not actually subjected to a safe load test, and there was a problem that a complete safe load test was not performed. Further, the head bolts B are inserted into the through holes 31a and 32a of the two support members 31 and 32 one by one, and the head bolts B are manually fixed to the two support members 31 and 32 through the nuts N. In addition, since the security load test is performed by applying a security load to the headed bolt B in the axial direction, the test operation is very complicated and time-consuming. Therefore, although it can be adopted as a single inspection means for the head bolts B, it has a problem that it is difficult to adopt as a means for inspecting all the head bolts B.

  Therefore, the present invention provides an axial force guarantee bolt inspection system capable of performing a secure load test on all head bolts so that an axial force guarantee load test of head bolts can be performed easily and quickly simultaneously with thread rolling. Offering is an issue.

Means for solving the problem

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is directed to the end position of the head bolt at the rolling end position of the thread rolling device that forms the threaded portion by rolling rolling at the tip of the head bolt. It is characterized by having a security load mechanism that raises the head and applies a certain security load between the head and the screw portion and measures whether or not the security load test is passed.

  In addition, the invention according to claim 2 of the present application is a method of removing the dents in the final head bolt which has been formed by forging by a former and thread-rolled and subjected to heat treatment and plating by rolling rolling. Whether or not to pass the guaranteed load test by pulling up the head of the head bolt and applying a certain guaranteed load between the head and the threaded portion at the rolling end position of the thread removing device for removing traces. It is equipped with a security load loading mechanism to measure, and an adhesion mechanism that attaches an identification object such as a mark, paint or cap, which is a standard for acceptance to a headed bolt that has passed a security load test by the security load loading mechanism. And

The invention's effect

  According to the present invention described above, the axial load guarantee load test of the head bolts can be performed easily and quickly at the same time as the thread rolling, and the guarantee load test can be performed on all the head bolts. The reliability can be remarkably increased as compared with the conventional axial force guarantee bolt inspection system.

  In addition, a screw rolling device for removing dents that removes dents in the final head bolt that has been forged and formed by a former, screw-rolled, heat-treated and plated, etc. by rolling rolling By using a configuration that combines the bolt secure load load mechanism, it is possible to perform a secure load test together with the removal of dents by a thread rolling device, and it is possible to easily and quickly perform the secure load test. The guaranteed load test can be performed smoothly on all bolts. In addition, a coating applied to the head of a head bolt, for example, by providing an attachment mechanism that attaches an identification object such as a mark, paint, or cap, which is a standard for passing, to the head bolt B that has passed the guaranteed load test. By visually observing T, it can be easily confirmed that the product has passed the guaranteed load test. As a result, the user can actually use the headed bolt B that has passed the guaranteed load test and the axial force is guaranteed. It can be used without error after visual confirmation.

BEST MODE FOR CARRYING OUT THE INVENTION

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an inspection system for an axial force guarantee bolt according to the present invention. Reference numeral 1 denotes a dent in a final head bolt B which has been forged by a former, thread-rolled, and subjected to heat treatment and plating. A rolling device for removing dents 2 by rolling rolling, a chute for sequentially transferring the headed bolt B to the screw rolling device 1 for removing dents, 3 opens and closes the tip opening 1a of the chute 2 Opening / closing supply mechanism 4 having an opening / closing body 3a for supplying headed bolts B downward one by one is arranged in front of the tip opening 2a of the chute 2 and is driven at a constant angle by a driving means (not shown) such as a motor. Roller rolling die that is intermittently rotated (90 ° in the figure), 5 is an arc-shaped segment rolling die arranged on the outer periphery of the roller rolling die 4, and 6 is roller rolling. Support portion provided on the upper surface of the die 4 A plurality of L-shaped lifting levers 8 supported so as to be swingable are disposed in front of the chute 1 in the rotation direction of the 90 ° roller rolling die 3, and the lifting lever 6 is connected to the head of the headed bolt B It has an axial force tester rod 81 that swings in the pulling direction and applies a certain guaranteed load between the head B2 of the headed bolt B and the screw part B1 and measures whether or not it passes the guaranteed load test. It is a safe load loading mechanism.

  The roller rolling die 4 is provided with a screw forming portion 4a on the outer periphery and is rotatably supported by a machine base (not shown) via a rotary shaft 9, and intermittently by a driving means at a constant angle (90 ° in the figure). It is rotated. The segment rolling die 5 includes a screw forming portion 5a facing the screw forming portion 4a on the inner periphery, and is disposed outside the roller rolling die 3 by a support mechanism 11 at a predetermined interval. The L-shaped lifting lever 6 is composed of a vertical arm portion 6a and a horizontal arm portion 6b, and a bent portion thereof is supported by the support portion 7 via the swing shaft 61 so as to be swingable in the vertical direction, and forward. The horizontal arm portion 6a extending to the bottom is formed with a support groove 6c that supports the lower surface of the head B2, that is, the neck portion of the headed bolt B. The pull-up lever 6 is normally urged to the upper side of the roller rolling die 4 by urging means (not shown) such as a ball and a spring.

  The guaranteed load load mechanism 8 is moved forward and backward by a drive means (not shown) such as a hydraulic mechanism to swing the vertical arm portion 6a of the pull-up lever 6 around the swing shaft 61, thereby causing the headed bolt B to move. The axial force tester rod 81 for applying a certain guaranteed load is provided. On the intermediate portion of the axial force tester rod 81, when a certain guaranteed load is applied to the headed bolt B, the deflection acting on the axial force tester rod 81 is applied. An axial force measuring sensor 12 is provided which measures the axial force of the head bolt B from, for example, a piezo.

  In addition, the paint adhesion that adheres to the head B2 of the headed bolt B that has passed the security load test by the security load loading mechanism 8 as shown in FIG. A mechanism 13 is provided.

  The operation of the axial force ensuring bolt detection system configured as described above will be described below.

  First, the final headed bolt B, which has been manufactured in advance with high precision by a former and is thread-rolled and subjected to heat treatment and plating treatment, is continuously transferred to the tip opening 2a by the chute 2. Then, with the roller rolling die 4 stopped, the opening / closing body 31 of the opening / closing supply mechanism 3 is retracted to open the tip opening 2a, and the head head bolt B is located at the bolt supply position (A). The pull-up lever 6 is supplied and supported in the support groove 6c of the horizontal arm portion 6a. And the opening-closing body 31 of the opening-closing supply mechanism 3 is advanced at the timing when the support is completed, and the front-end | tip opening part 2a is closed. Thereafter, the roller rolling die 4 is rotated by 90 °, and the pulling lever 6 supporting the headed bolt B is moved to a position facing the security load mechanism 8. At the time of this movement, rolling rolling is performed on the screw portion B1 of the screw portion B1 of the headed bolt B by the screw forming portion 4a of the roller rolling die 4 and the screw forming portion 5a of the segment rolling die 5, and the screw portion The dents attached to B1 are removed.

  Next, after the roller rolling die 4 rotates and stops at the guaranteed load load position (d), the axial force tester rod 81 of the guaranteed load load mechanism 8 is advanced by the hydraulic mechanism to raise the pulling lever 6 and pull it. A security load test is performed by applying a certain security load between the head B2 and the screw portion B1 of the head bolt B via the upper lever 6. At this time, the screw portion B1 of the headed bolt B is held by the screw forming portion 4a of the roller rolling die 4 and the screw forming portion 5a of the segment rolling die 5 so as not to come out. When the fixed load 8 is applied to the headed bolt B, the guaranteed load 8 is measured between the head B2 of the headed bolt B and the screw part B1, in other words, the neck is not broken and the axial force is measured. Only when the sensor 12 measures a certain axial force or more, it is determined that the guaranteed load test has been passed, an open signal is sent to the paint adhesion mechanism 13, the paint adhesion mechanism 13 is opened, and the head of the headed bolt B The paint T, which is a measure of success, is sprayed on the upper surface of B2 as shown in FIG.

  On the other hand, when a certain guaranteed load is applied to the head bolt B, as shown in FIG. 3, if a break occurs between the head B2 and the screw portion B1 of the head bolt B, the axial force measuring sensor 12 is used. However, at this time, it is determined that the product is defective, and is discharged by a discharge means (not shown) such as a reaction at the time of breakage or proper extrusion at the secure load test position. At this time, with respect to the headed bolt B that is broken and failed in the secure load test, the release signal to the paint adhesion mechanism 13 is not output, and the paint adhesion mechanism 13 does not spray the paint.

  Further, during the guaranteed load test, at the bolt supply position (a) described above, the next headed bolt B is supplied and supported by the opening / closing supply mechanism 3 to the support groove 6c of the pull-up lever 6. Will be.

  Thereafter, with the axial force tester rod 81 retracted by the hydraulic mechanism and positioned in the retracted position, the headed bolt that has been subjected to the security load test by rotating the roller rolling die 4 90 ° forward in the rotational direction. The pull-up lever 6 that supports B is moved to the discharge position (c). After the pull-up lever 6 stops at the discharge position (c), the headed bolt B that has passed the guaranteed load test is taken out from the pull-up lever 6 by appropriate take-out means (not shown) such as a robot, and the axial force As a security bolt, it is housed in a case as appropriate.

  The security load test described above is performed for all the head bolts B that require high accuracy, and this makes it possible to remarkably improve the reliability as compared with the conventional axial force security bolt inspection system that performs unremarkably. . In addition, the dent removal screw rolling apparatus 1 for removing the dents in the final headed bolt B, which is formed by forging by a former and screw-rolled and subjected to heat treatment and plating treatment, by rolling rolling, Since the construction is combined with the security load mechanism 8 of the head bolt B, the security load test can be performed together with the removal of the dents by the thread rolling device 1, and the security load test can be performed easily and quickly. It is possible to perform a guaranteed load test smoothly on all bolts. In addition, it can be easily confirmed by visual inspection of the paint T applied to the head B2 of the headed bolt B that it has passed the guaranteed load test. As a result, the user can actually perform the guaranteed load test. The headed bolt B that has passed and the axial force is guaranteed can be visually confirmed and used without error.

  In the above embodiment, the dent removal screw rolling which removes the dent in the final headed bolt B which has been formed by a former and formed by screw rolling and subjected to heat treatment and plating treatment by rolling rolling. Although the description has been given of the combination of the forging device 1 with the guaranteed load loading mechanism 8 for the headed bolt B, the screw rolling device for forming the threaded portion by rolling rolling at the tip of the headed bolt formed by forging by the former. At the end of rolling, the head of the head bolt is pulled up, a certain load is applied between the head and the screw, and a load-bearing mechanism that measures whether the load is passed or not is passed. You may make it provide. Even in such a configuration, the axial force guaranteed load test can be easily and quickly performed simultaneously with the thread rolling of the head bolt that has been forged by the former, and the safe load test can be easily and easily performed for all the head bolts. The effect to perform is obtained.

  Further, as a means for confirming whether or not the head bolt B has a guaranteed axial force, the paint T is applied to the upper surface of the head B2 of the head bolt B as in the embodiment, and for example, an appropriate mark or the like is provided. You may make it stamp or print on the upper surface of head B2, or the front end surface of screw part B1. Further, as shown in FIG. 5, a cylindrical cap C made of nylon, urethane or rubber or a C-shaped cylindrical cap may be covered. When this cap C is used, the cap C is mechanically fitted to the threaded portion B1 of the headed bolt B taken out by the robot or the like at the discharge position (c) by an appropriate attachment mechanism (not shown). It is good, and by attaching the cap C, it is possible to guarantee the axial force to the worker, and at the same time, it is possible to prevent dents on the screw portion B1 until reaching the worker. In addition, if the paint T, mark, or cap C is color-coded according to the diameter or size of the head bolt B, the head bolt B having a desired diameter or size can be definitely taken out. .

  Furthermore, in the above-described embodiment, the general hexagon head bolt B has been described. However, the present invention is not limited to such a bolt B. For example, the head includes a collar portion as shown in FIG. Needless to say, the present invention can also be applied to the head bolt B ′ of the shaft diaphragm, the head bolt B ″ having an internal screw or a recess formed in the head, and the like.

  1 is a schematic plan view of an inspection system showing an embodiment of the present invention.   It is an AA arrow line view of FIG.   It is explanatory drawing which shows the detection state of inferior goods.   It is a front view of a head bolt.   It is a front view of a bolt with a head with a cap.   It is a front view of another head bolt.   It is a front view of another head bolt.   It is conventional explanatory drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screw rolling device for dent removal 3 Roller rolling die 5 Segment rolling die 6 L type lifting lever 8 Security load mechanism 13 Paint adhesion mechanism B Head bolt B1 Screw part B2 Head

Claims (2)

  Pull the head of the head bolt to the end of the rolling operation of the thread rolling device that forms the threaded portion by rolling and rolling at the tip of the head bolt, and apply a certain guaranteed load between the head and the screw portion. An inspection system for an axial force guarantee bolt, which is equipped with a guarantee load mechanism that loads and measures whether or not it passes a guarantee load test.   At the rolling end position of the dent removal screw rolling device that removes dents in the final head bolt that has been forged by the former and threaded, and heat treated and plated, etc. by rolling rolling , By pulling up the head of the head bolt and applying a certain guaranteed load between the head and the screw part and measuring whether or not it passes the guaranteed load test, and the guaranteed load loading mechanism An inspection system for an axial force guarantee bolt, comprising: a head bolt that has passed a guarantee load test, and an adhesion mechanism for adhering an identification object such as a mark, paint, or cap, which is a standard for acceptance.

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