JPH04188051A - Inspecting apparatus for cast disk rotor - Google Patents

Abstract

PURPOSE:To judge the quality of the opening of the cavity part of a rotor by rotating a cast disk rotor at a constant speed, penetrating light rays into the cavity in the direction of a diameter, and inspecting pulses which are periodically cut and generated. CONSTITUTION:A cast disk rotor 1 is constituted of two ring-plate parts 11 which face at a specified interval in the axial direction, a radiation plate part 12 and a cavity part 13. A rotor driving part 2 has a turntable 21 which is rotated at a constant speed. The positions of axial centers M of the rotor 1 and the table 21 are aligned, and the rotor and the table are mounted. The light which is emitted from a light emitting diode 31 and receiving part 3 is shaped into the intended cross-sectional shape through a stop plate 32. The light is converted into a pseudo-parallel-line pattern with a lens system 34 through a prism 33. The light is emitted in the direction of the diameter of the rotor 1. A microcomputer device 5 counts the widths and the intervals of the received pulse signals and judges the quality of the cast disk rotor.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a cast disc rotor inspection device.

[Prior Art] A disc rotor, which is a part of a disc brake device for a vehicle, has two ring plate parts (
It has a radial cavity portion with openings at both ends surrounded by a plurality of radial plate portions (hereinafter also referred to as ribs) arranged radially at equal angles and connecting the two wheel plate portions. There is.

[Problems to be Solved by the Invention] However, in the cast disc rotor, the cavity may not open normally due to poor casting. If this cavity is not opened properly, cooling will be insufficient and the cast disc rotor will overheat.

Conventionally, whether or not the cavity is opening properly has relied on the visual inspection of an inspector, but since the cast disc rotor is large and heavy, it took nine inspectors to carry out the inspection. Although it may be possible to design a complex inspection device to inspect the normal opening of a cavity, the complexity and scale of the inspection device become an obstacle to implementation in terms of installation costs.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an inspection device for a cast disc rotor that reliably detects the quality of the opening of the cavity of the cast disc rotor using a simple device.

[Means for Solving the Problems] The airtightness inspection device of the present invention includes two wheel plate portions facing each other at a predetermined interval in the axial direction, and equiangular radial arrangement between the two wheel plate portions. An inspection device for a cast disc rotor, comprising a plurality of radial plate parts connecting the two wheel plate parts, and a cavity with openings at both ends surrounded by the ring plate part and the radial plate part, and for determining the cast disc rotor. a rotor drive unit that rotates at a high speed; a light emitting unit that is disposed on one of the inner and outer sides of the two wheel plate parts and that penetrates the hollow part and emits a beam of light in the radial direction; a light receiving section that is arranged and receives the light beam; a binarization section that binarizes the signal output from the light receiving section at a predetermined threshold value and outputs a pulse signal; and a pulse width of the pulse signal. and a rotor quality determination unit that counts pulse intervals and determines that the cast disc rotor is a good product when all pulse widths and pulse intervals are within predetermined ranges.

In one preferred embodiment, the light emitting section and the light receiving section are integrally disposed on one side of the cast disc rotor, and a mirror that reflects the light beam is disposed on the other side of the cast disc rotor.

In this way, the cavity can be inspected twice using the light beam that travels back and forth.

[Operation and Effects of the Invention 1] In the cast disc rotor inspection device of the present invention, since the cast disc rotor rotates around its own axis, the light receiving part that receives the stationary light beam that passes through each cavity in the radial direction is , which is periodically interrupted by a cast disc rotor to output a pulse signal.

Therefore, simply by sequentially inspecting the pulse width and pulse interval of this pulse signal for one rotation, it is possible to accurately determine whether the opening of the cavity is good or bad.

That is, the cast disc rotor inspection device of the present invention inspects the quality of the openings of a large number of cavities opening in the radial direction of a cast disc rotor by rotating the rotor at a constant speed and shining a light beam into one cavity in the radial direction. By penetrating
Therefore, all cavities can be reliably inspected within a short time with a simple device configuration.

In particular, in this invention, since the light beam is emitted in the radial direction, it is possible to prevent the occurrence of blind spots, as will be described later, and there is an advantage that the inspection accuracy is improved.

[Example] A first example of the cast disc rotor inspection device of the present invention will be described below.
This will be explained using figures.

As shown in FIG. 1, this cast disc rotor inspection device includes a rotor drive section 2 that rotates a cast disc rotor 1 at a constant speed, and a light receiving/emitting section 3 provided close to the outer peripheral surface of the cast disc rotor 1. , a comparator (binarization unit in the present invention) 4 that binarizes the signal output from the reception/emission unit 3 at a predetermined threshold value and outputs a pulse signal, and a pulse width and a pulse interval of the pulse signal. a microcomputer device (rotor quality determination section in the present invention) 5 that counts the pulse widths and determines that the cast disc rotor is a good product when all pulse widths and pulse intervals are within predetermined ranges, and a mirror 6. There is.

As shown in FIGS. 1 and 2, the cast disc rotor 1 includes two ring plates (
disc) 11, about 40 radiating plate parts (ribs) 12 arranged equiangularly radially between the two wheel plate parts 11 and connecting the two wheel plate parts 11, and the two wheel plate parts 11 and the radial plate part 12. It has a cavity 13 that is surrounded by a cavity 13 that is open at both ends.

The rotor drive unit 2 has a turntable 21 that is rotated at a constant speed by a synchronous motor (not shown), and the cast disc rotor 1 is moved between the axis of the cast disc rotor 1 and the turntable 21 by a handling device (not shown). It is placed with the axis M aligned.

The light receiving and emitting section 3 includes a light emitting diode 3, as shown in FIG.
1, a diaphragm plate 32, a prism 33, a lens system 34, a focusing lens 35, and a light receiving diode 36, and is housed in a case 37.

The light emitted from the light emitting diode 31 is shaped by a diaphragm plate 32 into a desired cross-sectional shape (preferably an elliptical shape that is long in the axial direction and short in the circumferential direction (see FIG. 7)), and then passed through a prism 33 and sent to a lens system 34. The light is converged into a quasi-parallel beam and is emitted in the radial direction of the cast disc rotor 1.

The emitted light beam is reflected by mirror 6 and returns.
The light is focused by the lens system 34, reflected by the prism, focused by the focusing lens 35, and enters the light receiving diode 36.

FIG. 2 shows a cross-sectional view of the light beam reciprocating through the cavity 13, viewed in the axial direction.

Here, the light rays are converged to be slightly smaller than the height h of the cavity 13, but the height h may be larger or smaller in the axial direction than the height h. However, if the axial height of the light beam is small, the blind spot increases, and if it is large, the light utilization efficiency decreases.

On the other hand, as shown in FIG. 3, the circumferential width d' of the light beam is relatively narrower than the circumferential width d of the cavity 12. When the width d' of the light beam in the circumferential direction is large, the difference between the peak Sm and the valley Sv of the output signal S from the light receiving/emitting section 3 shown in FIG. 8 decreases.
In addition, the ratio of the slope portion SC+ increases and the slope becomes gentle, making it easy for errors in pulse width and pulse interval to occur.

In this embodiment, since the light rays are emitted in the radial direction, the light rays can travel close to the side surfaces 12a of the ribs 12 arranged in the radial direction. Therefore, when the light rays are not emitted in the radial direction (See Figure 5) has the advantage that blind spots are less likely to occur.

However, in another aspect of the invention, the circumferential width d of the light beam
It is also possible to set − to a large value.

The comparator 4 binarizes the signal voltage output from the light receiving/emitting section 3 using a predetermined threshold voltage Vref and outputs a pulse signal to the microcomputer device 5 . In FIG. 8, the signal voltage S output from the light receiving/emitting section 3 is expressed as the threshold voltage Vre.
This shows a state in which the pulse signal P is output after being binarized at f. T
w is the pulse width, Tp is the pulse interval, 3m is the optical signal voltage due to the light reflected by the mirror 6, and S is the optical signal voltage due to the light reflected from the outer peripheral surface of the cast disc rotor 1.

The microcomputer device 5 counts the pulse widths and pulse intervals of the received pulse signals, and determines that the cast disc rotor is a good product if all the pulse widths and pulse intervals are within predetermined ranges.

The operation of the microcomputer device 5 will be explained below with reference to the flowchart shown in FIG.

First, after setting the cast disc rotor 1 on the turntable 21, the microcomputer device 5 is initialized with power input (510). Through this initial setting, necessary parts inside the signal processing section 5 are set to initial values. Further, the light receiving/emitting section 3 and the turntable 21 are driven together with the power input.

Next, a timer built in the microcomputer device 5 is started (S12). This timer is set slightly longer than the time required for one rotation of the turntable 21.

Next, it waits until the pulse edge is input from the comparator 4 (514), and when the pulse edge is input, the counter built into the microcomputer device 5 is reset and started (316). This counter counts clock pulses at regular intervals.

Next, wait until the next pulse edge is input.
18) If a pulse edge is input, the counter is stopped (S20).

Next, the number counted by this counter is the pulse width W
or the pulse interval Tp (S22>). This can be determined based on whether the level of the pulse signal P received from the comparator 4 is high or low.

Next, the counted pulse width Tw or pulse interval Tp is compared with a reference pulse width or reference pulse interval stored in advance in S24>. If the difference is not within a predetermined range, the opening of the cast disc rotor 1 is determined to be defective and a defect signal is output (530). If it is normal, the timer is checked to see if it has finished (S26>; if it has not been finished, , 314
Return to and repeat the same routine.

On the other hand, if the timer has expired, it is assumed that the cast disc rotor 1 has been inspected for only one rotation, and the cast disc rotor 1 is
A good signal indicating that the aperture is good is output in step S28>, and the routine ends.

As explained above, the cast disc rotor inspection device of the present invention is an extremely simple device because the inspection is performed by pulsing the passage time of the light beam penetrating each cavity 13 and the subsequent interruption time of the light beam. Highly accurate inspections can be carried out, and the labor-saving effect is extremely large.

Note that the threshold voltage Vref can be determined as appropriate.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the cast disc rotor inspection device of the present invention, Fig. 2 is an axial sectional view of the cast disc rotor, and Figs. 3 to 5 are radial directions of the cast disc rotor. 6 is a block diagram of the light receiving and emitting part, FIG. 7 is a sectional view of the light beam, FIG. 8 is a signal voltage waveform diagram, FIG. 9 is a flowchart of the microcomputer device, and FIG. 10 is a complaint response diagram. . 1... Cast disc rotor 2... Turntable 3... Receiving and emitting section (light receiving section, light emitting section) 4... Comparator (binarization section) 5... Microcomputer device (rotor quality determination section) Figure 1 - ÷ same direction Figure 8

Claims (2)

[Claims] (1) two wheel plate portions facing each other at a predetermined interval in the axial direction, and a plurality of radial plate portions that are arranged radially at equal angles between the two wheel plate portions and connect the two wheel plate portions; An inspection device for a cast disc rotor having a hollow part with openings at both ends surrounded by the ring plate part and the radial plate part, the apparatus comprising: a rotor drive part that rotates the cast disc rotor at a constant speed about its axis; , a light emitting part disposed on one of the inner and outer sides of the two wheel plate parts and emitting the light beam in the radial direction through the hollow part; a light receiving section that receives light, a binarization section that binarizes the signal output from the light receiving section at a predetermined threshold value and outputs a pulse signal, and counts the pulse width and pulse interval of the pulse signal, An inspection device for a cast disc rotor, comprising: a rotor quality determination unit that determines the cast disc rotor to be good when all pulse widths and pulse intervals are within predetermined ranges. (2) The light emitting section and the light receiving section are integrally disposed on one side of the cast disc rotor, and a mirror section that reflects the light beam is disposed on the other side of the cast disc rotor. 1. The casting disc rotor inspection device according to 1.