JPH02190742A - High speed bending and vibrating method for test piece and device therefor - Google Patents

Abstract

PURPOSE:To perform a high speed bending, etc., for a test piece at the condition where no oscillation occurs up to the stroke almost twice that of the conventional case by mounting the test piece on a movable shaft connecting to a vibrating body vibrated in the direction of horizontal axis integrally with a coil part. CONSTITUTION:The coil part 8 of the vibrating body 6 is located in a space between inner/outer ferromagnetic substances 9, 10 integrated to a frame 5, and provided so as to freely vibrate in the direction of the horizontal axis line which is orthogonally crossed with the direction of magnetic field of a magnet 11 integrally constituted with the ferromagnetic substances 9, 10. The mobile shaft 12 is supported with a guide of air sliders 14, 14 so as to freely move both ways on the same axis line as the horizontal axis line of the vibrating body 6. Fixing units 15, 15 are provided on a supporting body 13 so as to face respectively to fixed parts 16, 16 on the shaft surface. With this arrangement, both ends of the test pieces B are put over the fixed parts 16 and the fixing units 15, and the frequency and voltage of a current flowing to the coil part 8 are adjusted by control elements, then controlled while confirming the stroke and the number of vibration by a counter. Consequently, bending fatigue, etc., for the test piece B can be quickly checked.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a high-speed bending/vibration method and apparatus for testing bending or vibration fatigue of flexible printed circuit boards (FPC), plastic films, cloth sheets, etc.

(Prior Art) There is a test piece high-speed bending/vibration device proposed by the applicant (see Japanese Patent Laid-Open No. 142233/1983).

The same 7klff (see Figure 6) is made by passing a current through the coil part (54) of the vibrating body (53) located in the magnetic field between the inner and outer ferromagnetic bodies (51) and (52) caused by the magnet (50). The vibration motion of the vibrating body (53) is determined in proportion to the strength of the current, and the free side end (58) opposite to the fixed side end (57) is attached to the fixed part (55) of this vibrating body (53). The test piece (56) is subjected to a high speed bending or vibration test.

This equipment can perform bending and vibration tests at an order of magnitude higher speed than conventional mechanical drive methods using motors, eccentric cams, and movable bodies. For example, for disk drives that require bending times of 10' or more. Cable bending test results can be obtained in less than a month with electrically driven methods, compared to about one and a half years for those using mechanically driven methods.

The bending and imaging width can be finely adjusted steplessly from small to large by adjusting the current to the coil.
Since it is electrically driven and has excellent durability, it has the advantage that it does not have the problem of not being able to maintain the initial performance due to wear of the operating system as compared to mechanically driven ones. It is.

(Problems to be Solved by the Invention) Although the device is thus useful, the following new problem has arisen.

■ The stroke of the vibrating body cannot be increased beyond a certain level.

■ The test piece is blurred.

As a result of investigating the causes of these ■ and ■, we found that, for example, during a bending test, the test piece attached to the vibrating body, which is the driving source, is bent and the reaction force generated causes the vibrating body to move in the photographing direction of the vibrating body. This is because the vibrator is loaded in orthogonal directions, and it was found that as the stroke of the vibrating body increases, the load increases and the wobbling of the test piece increases. It was also confirmed that this problem lies in the method that requires the vibrator to function both as a driving source and the attachment of the test piece as a part.

The present invention solves the problem based on the above-mentioned facts, and by specializing in the drive element using the electric drive method, which brings various advantages, and the element for attaching the test piece, the cost is nearly doubled. The high-speed bending/imaging method allows for the determination of fatigue and fracture due to bending or imaging of test specimens in a short time under conditions of no stroke and vibration, and vibrations occur up to nearly twice as long as with conventional equipment. The specimen can be bent or vibrated at high speed to prevent
Moreover, the device has excellent durability.

(Means for Solving the Problems) In the high-speed bending/vibration method of the present invention, the coil part of the vibrating body is housed in a tambar in a magnetic field between the inner and outer ferromagnetic bodies by a magnet, and a current is passed through the coil part. , a vibrating body is made to vibrate in the horizontal axis direction integrally with this coil part, and a fixed side end and a fixed side end are connected to the movable shaft through a movable shaft connected to the vibrating body and guided so as to be movable on the same horizontal axis. It is characterized by bending or vibrating the test piece to which the opposite free end is attached.

In the high-speed bending/vibrating device of the present invention, the vibrating body is mounted on the frame as a damper, and the coil portion integrated with the vibrating body is located in the space between the inner and outer ferromagnetic bodies that are integral with the frame, and The above-mentioned self-tilting magnetic body is integrated with the M4-shaped magnet so that it can vibrate freely in the horizontal direction perpendicular to the direction of the magnetic field, and a movable shaft on the horizontal axis of this vibrating body can be moved in the circumferential horizontal axis direction using an air slider. a fixing part connecting the vibrating body and the movable shaft and attaching the free end of the test piece to the movable shaft;
A fixing element to which the fixed end of the test piece is attached is provided at a relative position of the fixing part, and a control element having a frequency conversion circuit and a voltage regulator is short-circuited to the coil.

(Effect) [As 1 flows through the coil in the magnetic field, a mechanical force corresponding to the strength of the current acts on the coil and causes motion, causing the vibrating body to move from low speed to high speed along the horizontal axis. It vibrates freely, and the movable shaft reciprocates through the vibration stroke.

The movable shaft is guided and supported by an air slider with almost no movement resistance while floating in space, and moves regulated along the horizontal axis, and the test piece is also bent or vibrated at the same speed as the movable shaft follows. In addition, the vibration direction of the vibrating body is also regulated along the horizontal axis to vibrate.

(Example) An example of the implementation of the present invention will be described below with reference to the drawings.

Figure 1 shows the high-speed bending/vibration device of the second invention developed to implement the high-speed bending/imaging method of the first invention! The outline of (A) is illustrated.

This device (A) is composed of a vibration element (1), a mounting element (2) and a control element (3).

The excitation element (1) has an upright frame (5) on the base (4).
), the vibrating body (6) is connected to the damper (7), and the coil part (8) of the vibrating body (6) is connected to the frame (5) in the space (S) between the inner and outer ferromagnetic bodies (9) and (10). and space (
S) is provided so as to be able to freely vibrate in the transverse direction perpendicular to the direction of the magnetic field generated by the magnet (11) which is integrated with the free-tilting magnetic body (9) (1G>) in S).

The damper (7) is a corrugation damper with good amplitude, and the - layer is sufficient, and the coil l4 (8) has a space (
S) There is no rubbing on the forming surface.

The ball-shaped inner ferromagnetic material (9) is formed in a small diameter shape except for the surface portion (9a) forming the gap (S).
6) and mounting the movable shaft (12) in element (2)
Even if the vibration axis of the vibrator (6) is somewhat inclined from the set axis due to the connection relationship with the coil part (8), the coil part (8) is prevented from rubbing against the small diameter part (9b).

A control element (
3) is shorted.

For mounting, the element (2) is attached to the base (4) with an upright support (1).
3) is equipped with a movable shaft (12) guided and supported by a pair of left and right air sliders (14) so as to be able to reciprocate on the same axis as the horizontal axis of the vibrating body (6); 12) is connected to the vibrating body (6) so as to move integrally.

In addition, the support body (13) has fixing elements (15H5) above and below between the air sliders (14H4), and both air sliders (15H5).
14) are provided so as to face the fixed parts (16) and (16) of the upper and lower shirt surfaces that are applied to the movable shirt 1-(12) portion between the two sides, respectively.

The air slider (14) (14) has a well-known mechanical structure, in which the movable shaft (12) is guided and supported in a floating state by air pressure, and the vibrating body (14) is moved while the shaft receives almost no movement resistance. 6) I try to follow.

The fixing elements (15) (15) are movable up and down by turning knobs (17) (17), and the fixing parts (
The radius of curvature of the test piece (8) can be varied from about 2 to 20 #l by adjusting the distance between the test piece (8) and the test piece (8), so that the bending test can be performed at various radii of curvature.

Furthermore, the number of fixing elements (15) and fixing parts (16) may be increased or decreased by three or more, and the number of test pieces per test can be selected.

The control element (3) has a frequency converter for the current flowing through the coil section (8) and changes the vibration speed of the vibrating body (6) from 0 to 300.
A control section (18) that can be adjusted up to 0 cycles/minute, and a vibrating body (6) that adjusts the voltage of the current flowing through the coil section (8).
The maximum shooting stroke is 60.

A voltage regulator (19) that can be increased or decreased to a certain degree, and a support (1
3) A counter set at the end position of the movable shaft (12) on the side and communicating with the frequency conversion circuit in the aIIJill element (3) to count the frequency of the movable shaft (12) and measure the stroke. (20).

As a result, both ends of the test piece (B) are connected to the fixing part (16) and the fixing element (15), and the control element (3) controls the frequency and voltage of the current flowing through the coil part (8). By controlling the vibration speed and stroke of the vibrating body (6) while adjusting and checking the stroke and number of images with the counter (20), bending fatigue or vibration fatigue of the test piece (B) and even fracture can be significantly accelerated. You will be able to check it.

FIG. 3 illustrates another control element (3) when the test piece (B) is a PC, and the control element (3) is
A rupture detection/resistance measurement unit (21) that applies a current to the conductor pattern of the FPC (B) and measures the conductor resistance that increases due to metal fatigue due to bending, and detects conductor breakage. It also includes a resistance recorder (22) for recording, and a display section (23) for digitally displaying the frequency of the vibrating body (6), that is, the number of times the FPC (B) is bent.

As a result, the number of times the FPC (B) is bent can be displayed on the display section (23).
, the resistance recorder (22) is used to predict when the conductor will break, and the vibrating body (6) and counter (20) stop at the same time the break occurs, thereby detecting the break.
The number of bends at the time of rupture can be confirmed from the display section (23), and the state of rupture can also be confirmed by the resistance recorder (22).

Figure 4 shows another bending test type device 11 for FPC (B).
1(A) is shown as an example, and its basic configuration remains the same, so the explanation will be omitted.

The fixing element (15) in this device (A) is the one illustrated in FIG. It has the same configuration as the fixed element (15) in (A).

The control element (3) includes a pair of photoelectric switches (24) (24) that face each other with the bent portion of the FPC (B) and detects a break in the conductor, and a frequency conversion circuit in the 2i11 control section (18). It also includes a counter (25) that communicates and counts the frequency of the vibrating body (6), that is, the number of times the FPC (B) is bent, and also measures the stroke, and a display section (26) that digitally displays the number of times the FPC (B) is bent.

As a result, the number of times the FPC (B) is bent is displayed on the display section (26).
While checking visually with the photoelectric switch (24
) (24) and at the same time the vibrating body (6) stops the counter (25), so that the number of bends at the time of breakage can be confirmed from the display section (26).

Moreover, this apparatus (A) is effective for fracture tests based on fatigue due to bending or vibration of materials other than FPC, such as plastic films, metal films, paper, etc.

The numerical table shows the presence or absence of stroke and pre of the device ff1 (A) of the present invention illustrated in FIG. 1 and the conventional device shown in FIG. 6, and the number of days required for the bending test (108 times of bending) of the FPC (B). It shows.

The bending test was conducted under the following conditions.

FPC: thickness 85μ (base 25μ, copper foil 35μ, cover 25μ) FPC bending radius = 15n Bending speed 2: 3000 cycles/min.

Conventional JPCA120 cycles/min Stroke O-ri: 2Gm (Effect of the invention) Therefore, the method of the present invention has the following advantages.

■ Because it is electrically driven through a movable shaft,
It is possible to bend or vibrate a test piece at high speed, up to a stroke nearly double that of the conventional method, without causing any pretension, and the results of its fatigue state or fracture state can be determined in a relatively short period of time.

The apparatus of the present invention has the following advantages.

■ The test piece can be bent or vibrated at a desired speed from low to high speeds, and the stroke can be performed at a desired value nearly double that of conventional methods, allowing testing under various stroke conditions. Tests can be performed by continuously bending or vibrating at high speed without causing any damage to the test piece, and even if one test piece breaks, it does not adversely affect the other test piece or the vibrating body. .

■ It has excellent durability and can be operated continuously under certain conditions to bend or vibrate the test specimen at high speed with high accuracy.

[Brief explanation of the drawing]

FIG. 1 is a sectional view schematically illustrating the high-speed bending/vibration device for test pieces of the present invention, FIG. 2 is a block diagram of control elements, and FIG. 3 is a block diagram of other control elements. FIG. 4 is a partially sectional front view illustrating another device, and FIG. 5 is a block diagram of control elements in the same device. FIG. 6 is a sectional view schematically showing a conventional bending/vibrating device. In the figure (B) is the test piece (S) is the space is the excitation element (2) is the installation element is the control element (5) is the frame is the vibrating body (7) is the damper is the coil part (9) (1G) is The ferromagnetic material is a magnet (12) is a movable shaft and the air slider is a fixed element (16) is a fixed part

Claims (2)

[Claims] (1) A current is passed through the coil part of the vibrating body housed in a damper in the magnetic field between the inner and outer ferromagnetic bodies by the magnet, and the vibrating body is vibrated in the horizontal axis direction together with this coil part, Through a movable shaft connected to the vibrating body and movably guided on the same horizontal axis, a test piece whose fixed end and opposite free end are attached to the movable shaft is bent or vibrated. A method of high-speed bending and vibration of a test piece, which is characterized by: (2) A vibrating body is mounted on a frame as a damper, and a coil part integrated with the vibrating body is located in a space between the inner and outer ferromagnetic bodies that are integral with the frame, and has an integral structure with both of the ferromagnetic bodies in the same space. A movable shaft is provided on the horizontal axis of the vibrating body and is guided and supported by an air slider so as to be movable in the circumferential horizontal axis direction. A fixed part is connected to the movable shaft and the free end of the test piece is attached to the movable shaft, and a fixing element is set at a relative position of the fixed part to which the fixed end of the test piece is attached. , a high-speed bending/vibration device for a test piece, comprising a control element having a frequency conversion circuit and a voltage regulator short-circuited to the coil portion.