JP2002039706A - Screw inspection apparatus and screw inspection system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve efficiency of dimension check work of a screw. SOLUTION: In this screw inspection apparatus, two kinds of screw threads which are a screw thread 2 for go-inspection and a screw thread 3 for not-go inspection are installed in order on the same screw lead from the tip part. Introduction parts 2a, 3a of a taper thread are installed in both insertion end parts of two kinds of the screw threads for inspection. A trench part 5 for sweeping screw trench which has a side wall 5a facing the stretching direction of a ridgeline of the screw thread 2 is installed in an insertion end part of the screw thread 2. A shaft part 6 which is attached to a main shaft end of a rotary driving apparatus via a chuck 8 is installed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw inspection tool for efficiently performing a screw size check operation in accordance with JIS (Japanese Industrial Standard) and a screw inspection system using the inspection tool. .

[0002]

2. Description of the Related Art A conventional screw dimension check operation is performed, for example, when the screw to be inspected is a female screw, the female screw is subjected to, for example, JI.
While the thread thread gauge and the blind thread thread gauge of the limit gauge for female thread prescribed in JIS such as SB0251 can be screwed sequentially by hand in order, the thread thread plug gauge can be screwed by hand over the entire length of the internal thread without difficulty. If the set screw plug gauge cannot be screwed into the female screw more than 2 turns without difficulty by hand,
If the inspection target is a male screw, the same operation is performed using a screw ring gauge and a blind screw ring gauge as per the male screw limit gauge specified in JIS. Do.

[0003]

However, the conventional screw dimension check work has a problem that the work efficiency is low. The cause of the problem is analyzed. (1) The gauge is correctly held vertically and the It is difficult to fit to the screw to be inspected arranged in the above. (2) Gauge insertion is hindered by foreign matter such as dust or burrs in the screw groove. (3) Because it is completely manual work, it takes time if you are not a skilled worker. (4) In particular, it is difficult to determine whether or not the blind thread gauge will not fit due to the dimensional error of the screw or other reasons. (5) If you try to insert the screw quickly, the tip of the gauge is easily damaged. It turned out that there are factors such as:

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a screw inspection tool which advantageously solves the above-mentioned problems, and a screw inspection system using the inspection tool. According to a first aspect of the present invention, there is provided a screw inspection tool according to the present invention, wherein the insertion end of the inspection screw thread is provided with a tapered screw inlet.

[0005] According to such a screw inspection tool, since the tapered screw at the insertion end of the inspection screw thread guides the insertion of the inspection screw thread into the screw to be inspected, it is not a skilled worker. Also, the tip of the inspection screw thread can be easily and quickly inserted into the screw to be inspected by hand, and the efficiency of the screw dimension checking operation can be increased. Therefore, according to the screw inspection tool of the present invention, although it does not conform to JIS,
The thread size checking operation according to JIS can be performed with high efficiency.

According to a second aspect of the present invention, there is provided a screw inspection tool according to the present invention, wherein a screw groove flap groove having a side wall extending in a direction in which a ridge of the inspection screw thread extends is provided at an insertion end of the inspection screw thread. It will be equipped.

[0007] According to such a screw inspection tool, the thread groove flute groove having the side wall extending in the extending direction of the ridge line of the inspection screw thread provided at the insertion end of the inspection screw thread is formed on the screw to be inspected. Since foreign matter such as dust and burrs in the screw groove is scraped off on the side wall and removed forward in the screwing direction, the tip of the inspection thread can be easily and quickly inserted into the screw to be inspected by hand. Thus, the efficiency of the screw dimension checking operation can be improved. Therefore, according to the screw inspection tool of the present invention, although it does not conform to JIS, it is possible to perform a thread size check operation according to JIS with high efficiency.

Further, the screw inspection tool of the present invention according to the third aspect of the present invention is provided with two types of inspection screw threads for inspection and stop inspection on the same screw lead sequentially from the tip end. is there.

According to such a screw inspection tool, the screw inspection tool is manually screwed into the screw to be inspected, and the inspection screw thread for the pass inspection passes without difficulty, while the inspection screw thread for the stop inspection is formed. If the screw stops without any difficulty, it can be determined that the screw to be inspected is a pass.Thus, it is possible to perform the inspection and the stop inspection with a single screwing operation. If the screw is screwed into the screw to be inspected, the guide function allows the screw inspection tool to be fitted relatively well to the screw to be inspected, and the efficiency of the screw dimension checking operation can be increased. Therefore, according to the screw inspection tool of the present invention, although it does not conform to JIS,
The thread size check operation according to IS can be performed with high efficiency.

According to a fourth aspect of the present invention, there is provided a screw inspection tool according to the present invention, wherein two types of inspection screw threads, one for inspection and one for stop inspection, are sequentially provided from the tip portion on the same screw lead. At least at the insertion end of the inspection screw thread at the distal end side of the two types of inspection screw threads, a screw groove flap having a threaded portion of a tapered screw and a side wall extending in the extending direction of the ridge line of the inspection screw thread. And at least one of them.

According to such a screw inspection tool, the functions and effects of each of the screw inspection tools of the present invention described above can be achieved with a single screw inspection tool, and the efficiency of the screw dimension checking operation can be further improved.

[0012] The screw inspection tool of the present invention is characterized in claim 5.
As described in, may be equipped with a shaft similar to the shaft of a tap for internal thread processing, for example, attached to the spindle end of the rotary drive via a chuck or a tapered shank,
If such a shaft portion is provided, the screw portion is rotated by a predetermined torque by a rotation driving device such as a screw machine having the shaft portion attached to the main shaft end and screwed into the screw to be inspected, thereby obtaining the screw. Inspection can be performed automatically, and the efficiency of the screw dimension checking operation can be further increased.

The screw inspection system of the present invention supports the screw inspection tool according to any one of the first to fifth aspects and the screw inspection tool at a spindle end via, for example, a chuck or a tapered shank. And a rotation drive device which is rotated by a predetermined torque and screwed into a screw to be inspected.

According to such a screw inspection system, the rotary driving device rotates the screw inspection tool with a torque equal to or less than a predetermined value corresponding to the torque to be screwed in manually and screwed into the screw to be inspected. If the thread for inspection passes, it can be judged that the inspection passed as the screw,
If the inspection thread for the stop inspection does not pass, it can be determined that the stop inspection has passed, so the screw inspection can be performed automatically, preventing individual differences at the time of checking and checking the screw dimensions. Work efficiency can be further increased.

[0015]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Here, FIG. 1 is a side view showing a female screw inspection tool as one embodiment of the screw inspection tool of the present invention, and the female screw inspection tool of this embodiment indicated by reference numeral 1 in the figure is located at the left end in the figure. The inspection thread 2 for the through inspection and the inspection thread 3 for the stop inspection are provided at the same pitch on the same screw lead in this order from the leading end.
The inspection thread 3 for the stop inspection is a J for checking the dimensions of the internal thread to be inspected by the internal thread inspection tool 1 except for the insertion ends of those threads which face to the left in the figure.
As specified in IS, the thread plug gauge and the blind thread plug gauge are formed to have dimensions and shapes respectively conforming to the threads of the gauge.

In the female screw inspection tool 1 of this embodiment,
The inspection thread 2 for the inspection has an insertion portion 2a of a taper screw having an invocation angle α at the insertion end thereof, and the inspection thread 3 for the stop inspection at the insertion end thereof.
It is provided with a threaded portion 3a of a tapered screw having a thread angle β smaller than the thread angle α, wherein the thread angle β is smaller than the thread angle α because the thread 2 for inspection is used for the internal thread to be inspected. Is screwed into the female screw, the inspection screw thread 2 functions as a guide, and the female screw inspection tool 1 fits relatively well with the female screw to be inspected without shaking. This is because the screw thread 3 for inspection stops smoothly and can be screwed into the female screw to be inspected. In addition, each calling part 2
The screw pitches a and 3a are the same as the screw pitches of the portions other than the insertion ends of the inspection screw threads 2 and 3.

In the female screw inspection tool 1 of this embodiment,
At the insertion end, the inspection thread 2 for the through inspection has at its insertion end a thread groove flute groove 5 having a side wall 5a oriented in the direction in which the ridge of the inspection thread 2 extends, the radius of the side wall 5a. The outer end in the direction forms a cutting edge.

Further, the female screw inspection tool 1 of this embodiment is
A circumferential groove 4 is provided between the inspection thread 2 for the street inspection and the inspection thread 3 for the stop inspection, and the circumferential groove 4 is inserted into the inspection thread 3 for the stop inspection. It serves as a relief for the tool when forming the threaded portion 3a of the tapered screw at the end, facilitating the formation of the threaded portion 3a.

Further, the female screw inspection tool 1 of this embodiment is
As described above, the inspection thread 2 for inspection and the inspection thread 3 for stop inspection are integrally formed so as to be supported by the handle and the chuck, and support the inspection threads 2 and 3. A shaft portion 6 similar to the shaft portion of a normal tap for machining a female screw is provided. A rear end portion of the shaft portion 6 located at the left end portion in the figure is also a shaft portion of a tap for machining a female screw. Similarly, a square section 7 having a square cross section is formed.

According to the female screw inspection tool 1 of this embodiment,
For example, when the square part 7 at the rear end of the shaft part 6 is attached to a tap handle or the like, and the female screw inspection tool 1 is manually screwed into the female screw to be inspected, the inspection thread 2 for the street inspection and the stop inspection are performed. The threaded portions 2a, 3a of the tapered screws provided at the respective insertion ends with the inspection screw thread 3 for guiding guide the insertion of the inspection screw threads 2, 3 into the screw to be inspected. Even so, the tips of the test threads 2 and 3 can be easily and quickly inserted into the screw to be inspected, and the efficiency of the work of checking the dimensions of the female screw can be increased.

Further, according to the female screw inspection tool 1 of this embodiment, for example, the square portion 7 at the rear end of the shaft portion 6 is mounted on a tap handle or the like, and the female screw inspection tool 1 is manually inspected. When screwed into the test thread, the thread groove flute groove 5 having a side wall 5a which is provided at the insertion end of the test thread 2 for the test and has a side wall 5a extending in the direction in which the ridge of the test thread 2 extends, Foreign matter such as dust and burrs in the thread groove of the female screw is scraped off by the side wall 5a and removed forward in the screwing direction, so that the tip of the inspection screw thread 2 can be easily and quickly manually inserted into the female screw to be inspected. It can be inserted, and the efficiency of the dimension check operation of the female screw can be increased.

Furthermore, according to the female screw inspection tool 1 of this embodiment, the inspection screw thread 2 for inspection and the inspection screw thread 3 for stop inspection are provided on the same screw lead sequentially from the tip end. Therefore, for example, the square portion 7 at the rear end of the shaft portion 6
Is attached to a tap handle or the like, and when the female screw inspection tool 1 is manually screwed into the female screw to be inspected, the inspection screw thread 2 for the through inspection passes without difficulty and the inspection screw thread 3 for the stop inspection. If it stops without passing through without difficulty, it can be determined that the internal thread to be inspected has passed, so that a single screwing operation can be used to perform the inspection and the stop inspection, and furthermore, the inspection thread for the street inspection When the female screw 2 is screwed into the female screw to be inspected, the female screw inspection tool 1 can be relatively well fitted to the female screw to be inspected by the guide function, so that the efficiency of the screw dimension checking operation can be improved.

Therefore, according to the female screw inspection tool 1 of this embodiment, although it does not conform to JIS, the work of checking the dimensions of the female screw according to JIS can be performed with high efficiency.

FIG. 2A is a configuration diagram showing a female screw inspection system as an embodiment of the screw inspection system of the present invention together with a female screw to be inspected. The female screw inspection system of this embodiment is the same as that of the above embodiment. A rotation drive device comprising an internal thread inspection tool 1, supporting the internal thread inspection tool 1 via a normal chuck 8 at a spindle end (not shown), rotating the same with a predetermined torque, and screwing the workpiece 9 into an internal thread 10 to be inspected of the work 9. As a tapping machine (not shown).

According to the female screw inspection system of this embodiment, the tapping machine rotates the female screw inspection tool 1 with a predetermined torque corresponding to the torque to be screwed in by hand, and the female screw inspection tool 1 Since the screw is screwed into the female screw 10 to be inspected, as shown in FIG. 2 (a), if the screw thread 2 for inspection passes through the female screw 10 as a result of the screwing, it can be determined that the inspection has passed as the female screw 10. Further, the female screw inspection tool 1 is screwed in, and the inspection screw thread 3 for stopping inspection does not pass through the female screw 10 so that the female screw 10
If it stops within, it can be determined that the stop inspection has passed.

On the other hand, as shown in FIG. 2B, when the inspection thread 2 for the inspection does not pass through the female screw 10 with the above-mentioned predetermined torque and stops in the female screw 10, the female screw 10 is It can be judged that it is too small and rejected.
As shown in (c), when the inspection thread 3 for the stop and the inspection thread 3 also passes through the female screw 10 with the above-mentioned predetermined torque after the inspection thread 2 for the inspection passes, the internal thread 10 becomes large. It can be judged that it was too late.

Therefore, according to the female screw inspection system of this embodiment, the female screw can be inspected automatically, the individual difference at the time of the check can be prevented, and the efficiency of the female screw dimension check work according to JIS can be improved. Can be even higher.

Although the present invention has been described with reference to the illustrated examples, the present invention is not limited to the above examples. For example, any one of an inspection thread for a street inspection and an inspection thread for a stop inspection may be used. It may be configured so as to include one of them, or it may be configured such that the inspection groove for stopping and stopping the groove portion for screw groove groove is provided.

Further, the screw inspection tool and the screw inspection system of the present invention can be applied to the inspection of male threads in the same manner as described above. It may be formed in a ring shape having one or both of a crest and an inspection screw thread for a stop inspection, for example, provided with a shaft portion, and supported and rotated by a rotation driving device.

[Brief description of the drawings]

FIG. 1 is a side view showing a female screw inspection tool as one embodiment of a screw inspection tool of the present invention.

FIG. 2A is a configuration diagram showing an internal thread inspection system as an embodiment of the thread inspection system of the present invention together with an internal thread to be inspected, and FIGS. 2B and 2C are female thread inspection systems of the embodiment. It is explanatory drawing which shows the case where the internal thread which carried out dimension check at the time of rejection, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Internal thread inspection tool 2 Inspection thread for two-way inspection 2a Inlet 3 Inspection thread for stoppage inspection 3a Inlet 4 Circumferential groove 5 Screw groove flattening groove 5a Side wall 6 Shaft 7 Square part 8 Chuck 9 Work 10 Female thread α, β Calling angle P Pitch

Claims (6)

[Claims] 1. A screw inspection tool comprising: an insertion end of an inspection screw thread; 2. A screw inspection tool, comprising: a thread groove flute groove having a side wall extending in a direction in which a ridgeline of the inspection screw thread extends at an insertion end of the inspection screw thread. 3. A screw inspection tool comprising two types of inspection threads, one for inspection and one for stop inspection, which are sequentially passed from a tip end portion on the same screw lead. 4. An inspection thread and a stop inspection are sequentially provided from a tip portion, and two types of inspection threads are provided on the same screw lead, and at least the tip portion side of the two types of inspection threads is provided. A screw comprising at least one of a threaded portion of a tapered screw, and a thread groove flute groove portion having a side wall extending in a direction in which a ridge line of the inspection thread extends at an insertion end of the inspection thread. Inspection tool. 5. The screw inspection tool according to claim 1, further comprising a shaft attached to a spindle end of the rotary drive device. 6. A screw inspection tool according to claim 1, wherein said screw inspection tool is supported at a spindle end, rotated with a predetermined torque, and screwed into a screw to be inspected. And a screw inspection system.