JPS6254651A - Detecting method for small projection - Google Patents

Abstract

PURPOSE:To enable the detection of the existence or non-existence of a burr by making one of product faces contact slidably with a foundation in a direction orthogonal with the extension line of a groove formed on the foundation, and detecting the fluctuation of slide contact resistance due to the contact of a burr with the edge of the groove. CONSTITUTION:A product 3 is placed on the upper surface 1a of a foundation 1, with the face for checking the existence of a burr directed downward. Then, the product 3 is so shifted that the lower face 3a of the product 3 will be in a slide contact with the upper surface 1a of the foundation 1. In this case, the product 3 undergoes uniform resistance in sliding, if there is no burr on the lower face 3a. Also, if there is a burr 3b on the lower face 3a, the burr 3b comes in contact with the edge 2a of a groove 2, thereby increasing resistance working on the product 3 in sliding and enabling the detection of the burr 3b. Therefore, it is possible to check the existence of a burr by placing the bored product 3 on the foundation 1 without any change of the posture thereof, and simply shifting the product 3.

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 that protrudes in the feeding direction of the drill is formed on the peripheral edge of one end of the prepared hole. This burr is removed by the next reaming process.

By the way, when drilling with a drill, if the feed rate of the drill is large or if the drill is worn,
A large, thick burr is formed, and this burr may not be completely removed by the subsequent reaming process and may remain at the periphery of the hole. This burr disturbs the horizontal positioning accuracy of the product and causes machining defects when performing processing in a subsequent process, such as milling. 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 the presence or absence of burrs is checked visually, which may cause them to be overlooked. Taking this into consideration, it seems 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, and aims to provide a method for reliably detecting small protrusions such as burrs formed on one surface of a product without the need to turn the product over. be.

[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, when one side of the product is brought into sliding contact with a flat surface on which grooves are formed in a direction that intersects with the direction in which the grooves extend, the small protrusions come into contact with the edges of the grooves and the sliding contact resistance changes. By detecting this, the presence or absence of small protrusions is detected.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a surface plate on which one side of the product is brought into sliding contact. This surface plate is a plate having a rectangular shape in plan view. A plurality of grooves 2, 2, . . . are formed in the upper surface (flat surface) Ia of the surface plate 1, parallel to each other and spaced apart from each other by a predetermined interval.

In this embodiment, using the surface plate l having the above-mentioned 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 downward. Next, the product 3 is moved in the direction of arrow A in FIG. 1, and the lower surface (-surface) 3a of the product 3 is brought into sliding contact with the upper surface 1a of the surface plate l. In this case, if there is no burr on the lower surface 3a, the 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
edge 2a of the product 3, thereby increasing the resistance encountered during movement of the product 3 and making it possible to detect burrs.

As explained above, in the above embodiment, Komei can confirm the presence or absence of burrs by simply placing the processed product 3 on the surface plate 1 in the same posture and moving it.

In the above embodiment, burrs are detected by the worker moving the product 3 placed on the upper surface 1a of the surface plate L and sensing the change in sliding contact resistance.
For example, if a device is used that moves the product 3 using the piston rod of a hydraulic cylinder and uses a pressure gauge to detect changes in the load acting on the piston rod, it will not only require no experience on the part of the operator, but will also be easy to use. The presence or absence of burrs can be reliably confirmed.

[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, so there is no need to turn the product over and the product can be reliably removed. The effect is that small protrusions such as burrs formed on one surface can be detected.

[Brief explanation of the drawing]

1 and 2 are diagrams showing an embodiment of the present invention, in which FIG. 1 is a perspective view showing a surface plate with grooves formed on the upper surface;
FIG. 2 is a side sectional view showing a state in which the burr contacts the edge of the groove. 1a...Top surface (flat surface), 2...Groove, 2a...Edge, 3...Product,

Claims (1)

[Claims] This is a detection method for detecting small protrusions such as burrs formed on one surface of a product, in which one surface of the product is slid into contact with a flat surface on which grooves are formed in a direction that intersects the direction in which the grooves extend. 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 small protrusion comes into contact with the edge of the groove.