JPH0460781B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a detection method for detecting small projections such as burrs formed on one surface of a product.

[Prior Art] Generally, in order to machine a hole with high precision, a pilot hole is first made with a drill, and then a reaming process is performed to finish the hole. Among these processes, in the drilling process, a burr is formed on the peripheral edge of one end of the pilot hole that protrudes in the feeding direction of the drill. This burr is removed by the next reaming process.

By the way, when drilling holes with a drill, if the feed rate of the drill is large or if the drill is worn out, large thick burrs will be formed, and these burrs will be carried away during the next reaming process. Even if it is removed, it may not be completely removed and may remain on the periphery of the hole. This burr is removed during post-processing, e.g.
When milling or the like is performed, the horizontal positioning accuracy of the product is disrupted, causing machining defects. Conventionally, Komei would turn the product over after processing, visually check to see if there were any burrs left around the periphery of the hole, and if there were any burrs, they would be removed using a grinder or the like.

[Problems to be solved by the invention] By the way, when the product is heavy, the above-mentioned inversion work is extremely inefficient, and since the presence or absence of burrs is checked visually, it may be overlooked. Considering this fact, it would be good to provide a method for easily and reliably detecting the presence or absence of burrs. However, the reality is that such a method is not currently available.

This invention was made in view of the above circumstances,
It is an object of the present invention to provide a method for reliably detecting small protrusions such as burrs formed on one surface of a product without requiring the product to be turned over.

[Means for Solving the Problems] In order to achieve the object, the present invention detects small protrusions formed on one surface of a product by the following method.

That is, first, in the detection method of the present invention, a detection tool having a flat surface is used as the detection tool. A plurality of grooves extending in parallel directions and spaced apart from each other at regular intervals are formed on the flat surface. Furthermore, the edges of these grooves along the extending direction are approximately at right angles. Next, one side of the product is slid against the flat surface on which the grooves are formed in a direction that intersects the direction in which the grooves extend, and the small protrusions abut against the edges of the grooves, changing the sliding resistance. By detecting this, the presence or absence of small protrusions is detected.

[Example] An example of the present invention will be described below with reference to FIGS. 1 and 2.
This will be explained with reference to the figures.

In FIG. 1, reference numeral 1 denotes a surface plate (sensing tool) for slidingly contacting one surface of the product. This surface plate (detection tool) is a plate having a rectangular shape in plan view. A plurality of grooves 2, 2, . . . are formed on the upper surface (flat surface) 1a of this surface plate 1, parallel to each other and spaced apart at a constant interval. Edges 2d of these grooves 2 along the extending direction are formed at approximately right angles.

In this embodiment, using the surface plate 1 having the above configuration, burrs (small protrusions) formed on one surface of a product are detected in the following manner.

That is, first, the product 3 is placed on the upper surface 1a of the surface plate 1 with the surface to be checked for burrs facing down. Next, move the product 3 in the direction of arrow A in FIG.
is brought into sliding contact with the upper surface 1a of the. In this case, if there is no burr on the lower surface 3a, the low resistance that the product 3 receives during movement will be uniform. Further, as shown in FIG. 2, if there is a burr 3b on the lower surface 3a, the burr 3b comes into contact with the edge 2a of the groove 2, thereby increasing the resistance received when the product 3 moves, and causing the burr to come into contact with the edge 2a of the groove 2. can be detected. As explained above, in the above embodiment, the presence or absence of burrs can be checked by simply placing the drilled product 3 on the surface plate 1 in the same position and moving it. Furthermore, since the method of this example uses the detection tool having the above-described configuration, it has the following advantages.

First, in the detection tool of this example, the edge 2a of the groove is approximately at a right angle, so it is sharp (for example, R0.02 or less).
Not only is it easy to process the edges, but also the edge 2
Even if the edge a is worn out, it is easy to sharpen the edge by reprocessing.

Furthermore, since the edge portion 2a is formed at a substantially right angle, there is an advantage that this portion has high wear resistance. That is, when the edge 2a is formed at an acute angle, the edge tends to become rounded due to wear. In this case, the burr 3b formed on the product 3 passes over the edge 2a relatively smoothly, resulting in a problem that it is difficult to detect the presence of the burr 3b. On the other hand, the method of this example has the advantage that since the edge 2a is made at a substantially right angle, the edge is less likely to be rounded, the presence of the burr 3b can be reliably detected, and the detection work is highly reliable. be.

Furthermore, in the method of this example, since the surface plate 1 having a plurality of grooves 2 formed in one direction at regular intervals is used as a detection tool, the product 3 having the burr 3b is
When the burrs 3b are slid onto the upper surface 1a of the surface plate 1 in a direction intersecting the extending direction of the grooves 2, the burrs 3b abut periodically on the plurality of grooves 2 at regular intervals. Therefore, heavy sliding resistance is regularly applied to the palm of the worker who is moving the product 3 via the product 3 at a constant cycle. If there is only one groove 2, the presence of the burr 3b may be overlooked unless the product 3 is brought into sliding contact very carefully.To avoid this, the product 3 should be It is necessary to make the reciprocating movement many times, and repeat sliding contact with the parts where slight resistance is felt to confirm the presence of the burr 3b. On the other hand, in the method of this example, when the worker feels periodic and regular sliding resistance in the palm of his/her hand, it is possible to immediately confirm the existence of the burr 3b on the product 3, thereby increasing work efficiency. Not only is the resistance high, but also the sliding resistance is sensed periodically and regularly, so there is an advantage that the detection efficiency for the burr 3b is high.

In the above embodiment, the worker moves the product 3 placed on the top surface 1a of the surface plate 1 and detects burrs by sensing the change in sliding contact resistance. For example, if a device is used that moves the product 3 using a piston rod of a hydraulic cylinder and uses a pressure gauge to detect changes in the load acting on the piston rod, it goes without saying that the operator does not need to get used to it. Furthermore, the presence or absence of burrs can be confirmed more reliably.

[Effects of the Invention] As explained above, in the method for detecting small protrusions according to the present invention, one surface of the product is brought into sliding contact with a flat surface on which grooves are formed in a direction intersecting the direction in which the grooves extend, and the The presence or absence of a small protrusion can be detected by detecting the change in sliding resistance when the small protrusion comes into contact with the edge of the groove.
There is no need to turn the product over, and small protrusions such as burrs formed on one surface of the product can be reliably detected. Further, in the detection method according to the present invention, a plurality of grooves extending in parallel directions and spaced apart from each other at regular intervals are formed on the flat surface of the detection tool, and
Since the edge along the extending direction is substantially perpendicular, it is easy to form this edge sharply, and furthermore, it is easy to rework when worn.
Further, the wear resistance is higher than that in the case where the edges are formed at an acute angle, and the reliability of detecting small protrusions can be improved. Furthermore, when small protrusions are present, high sliding contact resistance is periodically and regularly applied to the palm of the worker who slides the product, which increases the accuracy of detecting small protrusions and improves the reliability of detection work. can be further improved.

[Brief explanation of the drawing]

1 and 2 are views showing one embodiment of the present invention, in which FIG. 1 is a perspective view showing a surface plate with grooves formed on its upper surface, and FIG. 2 shows burrs on the edges of the grooves. FIG. 3 is a side sectional view showing a state of contact. 1a...Top surface (flat surface), 2...Groove, 2a...Edge,
3... Product, 3a... Lower surface (one side), 3b... Burr (small protrusion).

Claims (1)

[Claims] 1. Remove small protrusions such as burrs formed on one side of the product.
A detection method using a detection tool having a flat surface, wherein a plurality of grooves are formed on the flat surface, extending in parallel directions and spaced apart from each other at regular intervals. The edges of this groove along the extending direction are approximately at right angles, and one surface of the flat product is brought into sliding contact in a direction intersecting the extending direction of the groove, and the small protrusion is A method for detecting a small protrusion, characterized in that the presence or absence of a small protrusion is detected by detecting a change in sliding resistance when the groove comes into contact with an edge of the groove.