JPS6035207A - Bend measuring device for crank shaft - Google Patents

Abstract

PURPOSE:To check the bend of a crank shaft without contact, by making the aligning direction of light receiving elements the direction, which is perpendicular to the longitudinal direction of the crank shaft, and computing the bending amount of a specified part based on the detected result of the image sensors. CONSTITUTION:A rod shaped light-source supporting table 21 is horizontally positioned in the longitudinal direction of a mounting table 10, i.e., at a position, which is separated by an appropriate length at one side in the direction of the X axis. Three longitudinal light sources 20 are attached to the light-source supporting table 21 in the X axis direction so that the source can be moved freely. On the other side of the X axis direction of the mounting table 10, a rod shaped image-sensor supporting table 31 provided with a scale 32 is horizontally positioned. Three image sensors 30 are attached on the image-sensor supporting table 31 in the X axis direction so that the sensors can be moved freely on the supporting table 31. A rotary chuck 15 is movably provided at an appropriate position on one end of the mounting table 10 in the X axis direction. The chuck is moved along a vertical plane passing the central line of crank shaft supporting tables 11 and 11, with the rotary axis of the chuck as the X axis direction. The chuck is rotated by a motor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bending measuring device used for inspecting the dimensions of crankshafts.

Inspection of the finished dimensions of a crankshaft involves measuring the distance from the center in the longitudinal direction of the crankshaft to each part and the bending (deviation) of each part with respect to the rotation axis, and the present invention relates to the latter measuring device.

Fig. 1 is a schematic diagram of a crankshaft for a 4-cylinder engine, and Fig. 2 is a schematic diagram of a crankshaft for a 2-cylinder engine.The journal parts 1b and Ib at both ends of the crankshaft 1 are used as reference parts, and in the case of a 4-cylinder engine, the central journal part is 1a, in the case of a two-cylinder engine, the bending of the central journal portion 1a, the journal portions 1b and lb at both ends, and the rotating shafts 1c and lc at both ends are measured.

By the way, conventional crankshaft bending tests have relied on human visual inspection using a gauge.

FIG. 3 is a schematic diagram showing an example of a conventional inspection method for a four-cylinder crankshaft and a gauge used therein.

A frame-shaped gauge 2 having an opening substantially corresponding to the planar outline of the crankshaft 1 to be inspected is fitted onto the horizontally placed crankshaft l, and is provided at both end journals lb, at portions corresponding to lb. Using the locking bands 2c and 2c of the gear 2, align the height position with the height of the axial center of the crankshaft 1, and then tighten the journal l.
b, lock it to lb.

At the center in the longitudinal direction on both long sides of the gauge 2, protrusions 2a, 2a are provided which are convex toward the center in a direction perpendicular to the longitudinal direction of the crankshaft 1. As shown in FIG. 4, the tip of the protruding portion 2a+2a extends to a position close to the center journal 1a, and while rotating the crankshaft 1, the edge of the tip of the protruding portion 2a, 2a and the center journal 1a are The bending of the crankshaft l is inspected by visually measuring the gap l between the crankshaft l and the crankshaft l.

With such conventional methods, it is impossible to quantitatively measure the difference between the standard value (design value) and the finished product dimensions, and it is simply a matter of determining whether or not the difference is within the tolerance (allowable error) range. I could only do so. In addition, since the sensory test is performed by human visual inspection, the test requires a long time and is far from accurate.

The present invention was made in view of these circumstances, and
The purpose is to provide a crankshaft life measuring device that can automatically measure the bending of a crankshaft quantitatively and without contact with the crankshaft that is the subject of inspection, eliminating human sensual testing. be. Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.

FIG. 5 is a schematic perspective view of a crankshaft life measuring device according to the present invention.

The plate-shaped rectangular pedestal 10 is supported horizontally by a support device (not shown), and its longitudinal direction (hereinafter referred to as the X-axis direction, and the direction perpendicular to this, that is, the width direction of the pedestal 10 is referred to as the Y-axis direction) is approximately A crankshaft support stand 11.11 is erected at the center of both ends in the Y-axis direction, and the upper surface of this crankshaft support stand 11.11 is formed in a V-shape. The structure is such that both end journals lb, lb of the crankshaft 1 to be measured are supported.

A rod-shaped light source support 21 is horizontally placed at a position separated by an appropriate length on one side of the gantry 1O in the longitudinal direction, that is, in the X-axis direction, with the longitudinal direction being the X-axis direction. In this embodiment, three vertically elongated light sources 20, 20, and 20 (only one is shown in the figure) are mounted so as to be movable in the X-axis direction.

In addition, a rod-shaped image sensor support stand 31 equipped with a scale 32 is located at a position separated by an appropriate length on the other side of the gantry IO in the X-axis direction.
is horizontally placed with its longitudinal direction as the X-axis direction.

In this embodiment, three one-dimensional image sensors 30 (only one is shown in the figure) are mounted on this image sensor support base 31 so that they can slide on the support base 31 in the X-axis direction, and their light receiving elements They are installed with the arrangement direction being vertical.

Further, a rotary chuck 15 is installed at an appropriate position on one end of the gantry IO in the X-axis direction so as to be movable along a vertical plane passing through the center line of the crankshaft support base 11.11 with its rotation axis in the X-axis direction. It is rotated by a motor 16 (see FIG. 6), which is not shown in FIG.

FIG. 6 is a block diagram of the arithmetic control system of the device of the present invention,
Arithmetic circuit 40, display device 41. Control switch 42, motor 16 for driving the rotary chuck 15, and its control circuit 1
7 etc.

The optical signal received by the one-dimensional image sensor 30 is converted into a digital electric signal corresponding to the amount of light received, which is sequentially output from the image sensor 30.Then, the binarization circuit 35 converts the signal into two types of bright and dark signals at a predetermined threshold value. After that, the data is input to an arithmetic circuit 40 using a microcomputer to perform arithmetic processing, which will be described later, and the results are displayed on a display device 41. The arithmetic circuit 40 also controls the rotation of the rotary chuck drive motor 16 via the control circuit 17.

Regarding the operation of the apparatus of the present invention configured as described above, the flowchart in FIG. 7 shows the calculation processing contents of the calculation circuit 40 when measuring the four-cylinder crankshaft shown in FIG. This will be explained according to the explanatory diagram in FIG.

The journal lb of the crankshaft l to be measured,
lb to the crankshaft support stand 11°11 of the mount lO
After fixing one end with the rotary chuck 15, each one-dimensional image sensor 30 is placed on the crankshaft l, using the scale 32 as a guide, to measure the part to be measured, that is, the center journal Ia, both end journals Ib, Ib. Each light source 20 is also moved to a position substantially facing each one-dimensional image sensor 30.

Next, when the measurement start switch 42 is operated, the calculation circuit 4
0 causes the one-dimensional image sensor 30 to scan the crankshaft 1 in the vertical direction, that is, in the Cx-Cx axis direction.

The scanning result in the Cx-Cx axis direction is read into the arithmetic circuit 40 via the binarization circuit 35 as a binary signal of two types, bright and dark, of which the portion read as the dark level is the image of the part to be measured. Since there is, the light receiving element number al+' at both ends
) Based on I, the light receiving element number C1 corresponding to the center of the image of the part to be measured is calculated by the following equation (1). However, the 8th
In the figure, it is assumed that the light receiving element numbers are assigned sequentially from the bottom of the image sensor 30.

Next, the arithmetic circuit 40 gives a control signal to the drive motor 6 of the rotary chuck 15 via the control circuit 17, and after rotating the rotary chuck 5 by 90 degrees, the cy
- The light receiving element number C2 corresponding to the scan in the cy axis direction and the center of the image is calculated using the following equation (2).

With the above, the crankshaft 1 is rotated 90 degrees around its rotation axis.
Since the numbers C, , C2 of the light receiving elements of the image sensor 3o corresponding to each center of the image scanned from two rotated directions are rounded, the arithmetic circuit 4o calculates the bending position 2 based on this CI+02.
is calculated using the following equation (3) and displayed on the display device 41.

Z = k I Ct C21- (31 tat, a pre-given constant for converting to k knee actual size. In addition, as in the case of the second measurement method described later, use a reference round bar and set the crank from its center. The distance to the center of the shaft 1 may also be calculated.

This completes a series of processes for measuring crankshaft bending by the apparatus of the present invention.Next, regarding the second measurement method, follow the flowchart in FIG. 9 showing the calculation processing contents of the calculation circuit 40 in that case. explain.

First, a reference round bar with a known diameter is placed on the crankshaft supports xi and ii, and the one-dimensional image sensor 30
Based on the light-receiving element numbers A and B corresponding to the upper and lower ends of the image, the light-receiving element number C1 corresponding to the center of the image is determined by the following formula (4). The actual size K, that is, the resolution is calculated.

C= -+ B...(4) Next, place the crankshaft 1 to be measured at a predetermined position on the pedestal 10, that is, on the crankshaft support stand 11°11, and then press the crankshaft 1 as in the first method. shaft 1 to 9
The part to be measured is scanned in two directions rotated by 0°, and a light receiving element number CI+02 corresponding to each center is calculated.

Next, the arithmetic circuit 40 calculates C and K calculated as described above.

ct l Based on C2, as shown in Fig. 10, from the center C1 of the reference round bar, that is, the design center, to the product crankshaft 1.
The distance to the actual center of
It is calculated using the formula and displayed on the display device 41.

Z-K (Ct C) 2+ (C2C) 2”f6)
In addition to displaying the bending amount 2 calculated as described above, the display device 41 may also display a pass/fail determination according to a preset tolerance.

As described in detail above, the crankshaft life measuring device according to the present invention includes: a mount on which a crankshaft is mounted with its longitudinal position fixed; and means for rotating the crankshaft about its radial center. , a light source disposed movably along the longitudinal direction of the crankshaft on one side of the mount with the light receiving element arrangement direction being perpendicular to the longitudinal direction of the crankshaft;
Since it is equipped with an arithmetic circuit that calculates the amount of bending of a predetermined portion of the crankshaft based on the detection results from the image sensor, it is possible to conduct a non-contact inspection of crankshaft bending, which was conventionally done by human visual inspection. This method has excellent effects, such as being able to perform the process quantitatively, quantitatively, and quickly.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, etc.
The figure is a schematic diagram of a crankshaft that is the object of measurement by the device of the present invention, Figure 3.4 is an explanatory diagram of a conventional cage used for bending inspection and its method of use, and Figure 5 is a schematic perspective view of the device of the present invention. 6 is a block diagram of the arithmetic control system, FIG. 7 is a flowchart showing the content of the arithmetic processing, FIG. 8 is an explanatory diagram showing the measurement method, and FIG. 9 is the second crankshaft using the device of the present invention. Flowchart showing the calculation processing contents of the calculation circuit when implementing the bending measurement method, 1st
Diagram O is an explanatory diagram of the amount of bending. l... Crankshaft 10... Frame 11...
・Crankshaft support stand 15... Rotating chuck
16... Rotating chuck drive motor 2o River light source 3o
...One-dimensional image sensor 4o...Arithmetic circuit patent Applicant Sumitomo Metal Industries Co., Ltd. Agent Patent attorney Noboru Kono / d Mine 1 Figure 2 Figure 2 Figure 4 G Figure r7 Figure q Figure 10

Claims (1)

[Claims] 1. A pedestal on which a crankshaft is placed with its longitudinal position fixed; a means for rotating the crankshaft about its radial center; and a direction in which the light-receiving elements are arranged orthogonal to the longitudinal direction of the crankshaft. A one-dimensional image sensor is disposed on one side of the mount to be movable along the longitudinal direction of the crankshaft, and a one-dimensional image sensor is disposed on the other side of the mount opposite to the image sensor. A crankshaft lifespan measuring device comprising: a light source; and an arithmetic circuit that calculates the amount of bending of a predetermined portion of the crankshaft based on the detection result by the image sensor.