JPH04275814A - Cutting tool - Google Patents

Abstract

PURPOSE:To easily ensure the accuracy of working depth of a countersink and prevent the eccentricity thereof by providing a guide portion for preventing the eccentricity of countersink working on the forward end of a tool main body, and providing a stopper for regulating the depth of countersink working on the tool main body. CONSTITUTION:A guide portion 3a for preventing the eccentricity of countersink working is provided on the front end of a tool main body 3 in a cutting tool for applying countersink working to a member 1 where a hole for a flat countersunk head screw is worked. Further, a stopper 4 for regulating the depth of countersink working is provided on the tool main body 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool for performing a flattening process on, for example, a plate-shaped member in which a hole for a countersunk screw has been previously machined.

0002

[Prior Art] Fig. 2 shows a conventional cutting tool disclosed, for example, on page 65 of the application system chart "Control technology for machine tool systems" published by the Japan Institute of Invention and Innovation (June 30, 1989). FIG. 2(a) is a sectional view showing the state immediately before the start of processing, and FIG. 2(b) is a sectional view showing the state immediately after the start of processing. In FIG. 2, 1 is a plate-shaped member, for example, with a countersunk screw hole 1a machined in the front, and 2 is a tool body for performing a flattening process on the countersunk screw hole 1a of the member 1, which is formed in a tapered shape at the tip. It has a cutting edge 2a that performs a roughening process on the flat head screw hole 1a.

Next, the operation will be explained. First, the tool body 2 is attached to a rotating spindle of a machine tool (not shown) via a sleeve. Next, after moving the cutting edge 2a of the tool body 2 to the vicinity of the flattened portion of the flat head screw hole 1a of the member 1, the tool body 2 is moved by rotating the rotary spindle.
is rotated, the rotary spindle is lowered, and the cutting edge 2a of the tool body 2 is used to remove the flatness of the countersunk screw hole 1a of the member 1.

0004

[Problems to be Solved by the Invention] However, with the above-mentioned conventional cutting tools, eccentricity occurs in the machining of the flat head screw hole 1a of the member 1, and imbalance occurs in the machining depth A of the flat head screw, making it difficult to ensure accuracy. was extremely difficult.

[0005] This invention was made to solve the above-mentioned problems, and it is an object of the present invention to provide a cutting tool that can prevent eccentricity during rough removal and ensure accuracy of machining depth. .

[0006]

[Means for Solving the Problems] A cutting tool according to the present invention is provided with a guide portion on the tip of the tool body to prevent eccentricity during the roughening process, and a stopper on the tool body to define the depth of the roughness removal process. It is something that

[0007]

[Function] The cutting tool of the present invention prevents eccentricity during rough cutting by the guide section provided at the tip of the tool body.
A stopper provided on the tool body defines the machining depth for roughness removal.

[0008]

[Example] Example 1. Embodiment 1 A first embodiment of the present invention will be described below based on FIG. 1. FIG. 1(a) is a sectional view showing the state immediately before the start of processing, and FIG. 1(b) is a sectional view showing the state immediately after the start of processing. In FIG. 1, 1 is a plate-shaped member, for example, which has a countersunk screw hole 1a in the front.
Reference numeral 3 denotes a tool body that performs a flattening process on the flathead screw hole 1a of the member 1, and 3a is a guide part provided at the tip of the tool body 3 to prevent eccentricity during the flattening process, and prevents slippage with the flathead screw hole 1a. In order to improve the fit, its outer diameter is made slightly smaller than the hole diameter of the countersunk screw hole 1a. 3b
4 is a cutting blade that is continuous with the guide portion 3a and is formed in a tapered shape and performs a roughening process on the flat head screw hole 1a; 4 is a stopper that is provided on the tool body 3 and defines the depth of the flattening process; For example, cutter blade 3 so that the depth is equal to A.
It is fixed at the position of dimension B from the blade piece b.

Next, the operation will be explained. First, the tool body 3 is attached to a rotating spindle of a machine tool (not shown) via a sleeve. Next, the guide portion 3a of the tool body 3
is inserted into the flat head screw hole 1a of the member 1, the tool body 3 is rotated by rotating the rotary spindle, and the rotary spindle is lowered to insert the rotary spindle into the flat head screw hole 1a of the member 1.
The roughening process a is performed using the cutting edge 3b of the tool body 3. The machining depth A of the cutting edge 3b of the tool body 3 can be reliably and precisely defined by the stopper 4 coming into contact with the cutting surface of the member 1. Moreover, the sliding engagement between the guide portion 3a of the tool body 3 and the countersunk screw hole 1a of the member 1 can prevent eccentricity during the flattening process. Therefore, it is possible to ensure the accuracy of the machining depth A for roughness removal and to prevent eccentricity at a low cost and without requiring any skill, and it is possible to obtain an extremely practical product.

0010

[Effects of the Invention] As explained above, the present invention provides a guide portion at the tip of the tool body to prevent eccentricity during the roughening process, and a stopper on the tool body to define the depth of the roughness removal process. This provides the effect of easily ensuring the accuracy of the machining depth for rough removal and preventing eccentricity.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing immediately before the start of processing (a) and immediately after the start of processing (b) in Example 1 of the present invention.

FIG. 2 is a cross-sectional view showing a state immediately before the start of machining (a) and a state immediately after the start of machining (b) using a conventional cutting tool.

[Explanation of symbols]

1 Components 3 Tool body 3a Guide part 3b Cutting blade 4 Stoppa

Claims (1)

[Claims] 1. A cutting tool for performing a flattening process on a member having a flathead screw hole machined therein, a guide part provided at the tip of the tool body to prevent eccentricity during the flattening process, and a guide part provided in the tool body, A cutting tool characterized by being equipped with a stopper that defines the depth of roughening processing.