JPS60161540A - Test apparatus of screw parts - Google Patents

Abstract

PURPOSE:To make it possible to obtain data required at the time of automatic clamping of a screw, by making it possible to inspect a threading condition such as clamping capacity or drilling capacity by variously changing the positional relation of the screw and a test piece threaded with said screw and measuring various conditions generated at the time of threading on the basis of an inspected result. CONSTITUTION:The test piece (workpiece) B on a mount table 3 receives displacement adjustment respectively in an X'-X axis direction, a Y'-Y axis direction and theta'-theta direction by adequately moving a first slide part 3b, a second slide part 3d and a revolving part 3g by the operation of handles 3a, 3c, 3f and is set to a position fitted to a desired test condition by these three-dimensional displacements. The driver D supported by a movable stand 6 receives displacement adjustment in a Z'-Z direction along a slide 8, in an X'-X direction by an extension and contraction stand 6b and in a phi'-phi direction by a revolving part 6b to be subjected to three-dimensional displacement and is set to a position fitted to a desired test condition.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a test device that quickly and accurately tests the threading performance of a male screw, the drilling performance of a drilling screw such as a tapping screw or a drill screw, and other various conditions.

(Prior Art) In general, automatic tightening of screws is indispensable in promoting automation of assembly production lines for various mechanical devices, and the operating rate of the production line is affected by whether or not screw tightening can be automated. However, in reality, technology for automating screw tightening has not yet been established.

In promoting automation, it is important to consider the material, shape, and inclination of the material to be tightened.
There are variations in the position of the pilot hole etc. due to factors such as the position of the pilot hole, etc., so it is necessary to deal with this, but there is currently no effective technology.

(Object of the invention) The present invention was made to solve these problems, and its purpose is to measure various conditions that occur when screws are screwed together, and to collect data that is sometimes necessary for automatic screw tightening. The object of the present invention is to provide a testing device for threaded parts that can be obtained.

(Summary of Hikari-kiri) The gist of the present invention is to make it possible to inspect screwing conditions such as tightening performance and drilling performance by varying the positional relationship between the screw and the test piece (workpiece) to which it is screwed. The object of the present invention is that it is possible to measure various conditions that occur not only when the shapes and materials of the screw and the workpiece differ, but also when the relative positional relationship between the screw and the workpiece changes in various ways.

In other words, the configuration of the test device of the present application includes a holding device for a test piece into which a screw is screwed, a screwdriver for tightening a screw that can be screwed into the test piece fixed by the holding device, and a screwdriver that rotates the screwdriver up and down. A testing device for threaded parts, comprising a power device for moving a screw component, wherein the holding device is movable in the X-Y direction and rotatable around the Y-axis to fix at least the test piece in a predetermined position. The power device includes a movable mounting table, and the power device includes a lifting device that can raise the driver to a high position away from the test specimen on the holding device, and adjusts the thrust force when the driver is lowered from zero to an arbitrary value. and a balancer capable of controlling the screw, and further comprising a measuring device that measures a predetermined condition when the screwdriver to which the screw is attached descends with a predetermined thrust after being stopped at top dead center. Parts trial #
, is a device.

This makes it possible to obtain data to know the positional relationship between the screw (drilling screw) and the workpiece, and to set a predetermined positional relationship between the screw and workpiece on an automatic assembly line, or to correct their mutual positional relationship. It is useful for

(Example) Hereinafter, an example of the present invention will be described in detail based on the mechanism diagrams shown in FIGS. 1 to 4 and the control block diagram shown in FIG. 5.

First, the configuration of the test equipment is as follows.

A holding device C for a test piece (workpiece) B into which a male screw A is screwed, and the test piece B fixed by the holding device C.
Tighten the male screw 8 that can be screwed into the screwdriver D.
A control circuit 1 that automatically measures and records the opening time and torque required for screwing or penetrating the workpiece B.
The measuring device F includes a measuring device F.

The holding device C supports the base 1, the mounting table 3 for the workpiece B fixed on the base 1, and the driver 〇@ base 1 so as to be movable up and down, and is attached to the driver D. A movable base 6 is provided for screwing the attached male screw A onto the workpiece edge on the mounting base 3. The movable table 6 includes a slide shaft 7 installed on the base 1, and a slide shaft 7 installed on the base 1.
It consists of a slide 8 that slides up and down along.

The mounting table 3 for the test piece (workpiece) B has a first sliding part 3b that is slid on the base 1 in the X--X axis direction via a handle 3a, and a first sliding part 3b on the first sliding part 3b. And the Y that is perpendicular to this
- the second t slid in the Y-axis direction via the handle 3G;
! II moving part 3d and a rotating part 3g that is rotated in the θ'-〇 direction around the Y'-Y axis via the handle 3f on the arcuate guide 3e provided on the second sliding part 3d. We are prepared. The workpiece B is attached above the driver torque sensor 3h provided on the rotating portion 3g.

The movable base 6 that supports the driver D includes a telescopic base 6b whose position can be adjusted up and down along the z''-z axis on the slide 8, and which can be expanded and contracted in the x'-x direction.
φ'-φ around the X axis on the telescopic and rotating part 6C of
The rotating part 6d functions as a part of a holder that holds the screwdriver.

On the other hand, the power device E includes a power source (not shown) for rotationally driving the driver 0, and an air cylinder 9 (not shown) for raising the driver D to a high position away from the workpiece B on the holding device C. (elevating device) and a balancer 10 that can adjust the thrust of the driver D during descent from zero to an arbitrary value. Note that a commercially available air drill is used as the driver 〇.

Further, the air cylinder 9 is mounted on a branch stand 11 fixed on the base 1, and the balancer 10 is attached to a support 12 planted on a support stand -iI. The air cylinder 9 has a rod 9a and a valve 9b, and the extendable rod 9a raises the driver D via the slide 8.

The balancer 1o includes a pair of sprockets 13 attached to both sides of a horizontal rod 1'2a whose center is fixed to the upper end of the support column 12, a chain 14 attached around the upper part of the sprocket 13, and a chain 14 attached around the upper part of the sprocket 13. It is composed of a weight holder 15 provided at one end of the chain 14 and an appropriate number of weights 16 placed on the weight holder 15, and the other end of the chain 14 is attached to the upper end of the slide 8 of the holding device C. The screwdriver D is moved up and down via the slide 8.

The measuring device F including the control circuit 18 has a set button 20 that causes the power device E to start lowering the driver D and at the same time returns the value of the measurement time counting circuit 19 to zero, and When the tip of the male screw A hits the surface of the workpiece 8 through the slide 8 and driver 〇 and the descent is stopped, the actuating block 2 is attached to the slide shaft 7 so as to be vertically adjustable.
After the male screw A is screwed into the workpiece B, the start switch 21 attached to the slide 8 gives a command to start the time measurement of the counting circuit 19 at the same time as the screwdriver D is actuated by contacting the slide 8. The slide 8 is moved so that the air cylinder 9 of the device E extracts the male screw A from the workpiece B, stops the driver D, and stops the counting operation of the counting circuit 19.
A stop switch 22 that gives a command to contact the lower surface 8a of the workpiece B, and a stop switch 22 that issues a command to operate when an abnormality occurs, moves the chain 14 and slide 8 of the power unit E upward from an arbitrary position to remove the male screw A from the workpiece B. It has an emergency stop button 23 which, when released, stops the driver D and stops the counting operation of the counting circuit 19.

Next, the operation of the test apparatus according to the above embodiment will be explained in detail.

The test piece (workpiece) B on the mounting table 3 is moved x' by appropriately moving the first sliding part 3b, the second sliding part 3d, and the rotating part 3g by operating the handles 3a, 3c, and 3f. -The displacement is adjusted in the x-axis direction, the Y--Y direction, and the θ--θ direction, and the position is set to meet the desired test conditions by these three-dimensional displacements.

Further, the driver D supported by the movable table 6 is moved along the slide 8 in the z''-z direction by the telescoping table 6b.
--- Three-dimensional displacement is appropriately performed by adjusting the displacement in the X direction and in the φ'-φ direction by the rotating portion 6b, and the position is set to meet the desired test conditions.

When the mounting table 3 and the movable table 6 are adjusted and the relative position and angle between the test specimen (workpiece) B and the driver D are set to the desired test conditions, the male screw A is attached to the driver D. Tightening performance is tested.

Before the test starts, the rod 9a of the air cylinder 9 is in an extended state, the driver D is at the top dead center, and the male screw A is in a standby state. Here, when the inspector presses the set button 20,
A signal is output from the flip-flop circuit 24 and relay circuit 2
5 is activated and the rod 9a of the air cylinder 9 is retracted, the slide 8 is lowered by its own weight corresponding to the desired thrust, and the value in the counting circuit 19 is returned to O. Next, when the tip of the male screw A that has moved downward comes into contact with the workpiece B, the start switch 21 is actuated because it is adjusted so as to just come into contact with the actuation block 23. As a result, the AND gate circuit 26 simultaneously receives the signals from the start switch 21 and the flip-flop circuit 24, provides the signal to the flip-flop circuit 22, and operates the driver D via the relay circuit 28.

At the same time, the signal of the flip knob circuit 27 is transferred to the gate circuit 2.
9 to the counting circuit 19 to start measuring the screwing time. A signal is given to the gate circuit 29 from a timekeeping oscillator 30 every 1/100 seconds, for example. Further, the measurement time of the counting circuit 19 is displayed on the numerical display device 31. Incidentally, when the start button 21 is pressed, the counting circuit 19 may be returned to Ovi and then time measurement may be started. When the screwing is completed, the start switch 22 is actuated by contact with the lower surface of the slide 8, and this return signal is given to each flip 70 knob circuit 24, 27, and the air cylinder 9 is connected via one relay circuit 25.
The slide 8 is raised, the driver D is stopped via the other relay circuit 28, and the male screw A is returned to its original standby state.

Also, at this time, from the flip 70 tube circuit 27 to the goo 1
- The signal to the circuit 29 is cut off, and the counting circuit 19 displays the screwing end time on the numerical display device 31 and stops counting operation.

On the other hand, the tightening torque detected by the torque sensor 31) is guided to the gate circuit 32. The gate circuit 32 operates using the output of the flip 70 knob 27, which opens after the start switch 21 operates until the stop switch 22 operates, as a gate signal, and the tightening detected by the torque sensor 3h is determined by the torque. Torque display device 33
can be displayed.

Therefore, the inspector can take records while looking at these display devices 31 and 33, or the numerical value recorder 34 and torque recorder 35 can record automatically.

The emergency stop button 23 can be manually operated by an inspector who senses an abnormality, or can be operated automatically when an abnormal value or torque is detected. A similar operation takes place.

In addition, when the driver D descends during the measurement, the weight 1
By changing the encounter in step 6, the test thrust can be adjusted from zero to any value, and the time required for the male screw A to engage the workpiece B to the desired test thrust can be measured. By comparing this with the value of the standard, the tightening performance of the male screw A can be determined.

Furthermore, by balancing the driver D with the plow 16 before lowering the driver D, the load on the air cylinder 9 can be reduced and power can be saved, and when lowering the driver D, the desired test thrust can be achieved. Just the weight that fits! 16 is removed from the chain 14 and lowered by its own weight.

In this way, the workpiece B and the driver D are each set to be displaced in the three-dimensional direction according to the desired test conditions, and the workpiece B b (data when variously displaced, i.e. The torque of the driver D and the time (energy) required for screwing can be measured and recorded, and conversely, the positional relationship between the workpiece B and the male screw A can be known from these data.
is movable, various workpieces B can be mounted on the mounting table 3 at once and a large amount of data can be sequentially collected, making inspection efficient.

(Other Embodiments) In the above embodiments, the mounting table 3 and the movable table 6 are each adjusted to be displaced in three dimensions, but if many test conditions are not desired, this can be done only in the -dimensional direction. , it can also be used as a simple test device.

Further, in the above embodiment, the case of male thread A was shown as the test object, but it can also be applied to the drilling performance test of drilling screws such as tapping screws and drill screws.

Further, as the driver D, a rotating device including a chuck that grips the screw and a motor that rotates the chuck may be used.

It goes without saying that various other modifications may be made within the scope of the invention, such as replacing the control circuit with a known control circuit that performs similar operations.

(Effects of the Invention) As explained below, according to the present invention, it is possible to automatically measure tightening performance, drilling performance, and other various conditions when the screw (drilling screw) and workpiece are displaced in various ways relative to each other. This is convenient for obtaining the maximum allowable displacement data when automatically tightening or drilling screws on an automatic production line. Additionally, it is possible to obtain data necessary for setting standard specifications and tolerances for pilot hole positions during product design.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a test device according to an embodiment of the present invention, FIG. 2 is a detailed enlarged view of the main part of FIG. 1, FIG. 3 is a left side view of FIG. 2, and FIG. Figure 2 is a plan end view, Figure 5 is the 1st side view.
FIG. 3 is a block diagram of an electric circuit in the test device shown in the figure. [Explanation of symbols] A... Male thread B... Workpiece (test piece) C.
・・Holding device D・・Driver E・・Power device
F...Measuring device 1...Base 3...Moving table 3h...Torque sensor 6...Movable base 7...Slide shaft 8...Slide 9...Air cylinder (elevating device) ) 10... Balancer 11... Strut stand 12... Strut 13... Sprocket 14... Chain 15
...Stalt 16 ... Weight 18 ... Control circuit Fig. 2 Fig. 3

Claims (1)

[Claims] A holding device for a test piece into which a screw is screwed, and a driver for tightening a screw that can be screwed into the test piece fixed by the holding device are rotated, and the driver is moved up and down. A testing device for threaded parts comprising a power device, wherein the holding device is movable in the X-Y direction and rotatable around the Y-axis to fix at least the test piece in a predetermined position. The power device includes a lifting device that can raise the driver to a high position away from the test specimen on the holding device, and can adjust the thrust force when the driver is lowered from zero to an arbitrary value. and a balancer, further comprising a measuring device for measuring a predetermined condition when the screwdriver to which the screw is attached is stopped at top dead center and then descends with a predetermined thrust. Test equipment.