JP2011011443A - Cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool which reduces the man-hour and shortens the processing time required for cutting.SOLUTION: The cutting tool is provided with a solid film-forming material which contacts the material to be cut upon cutting and forms a film on the cut surface as a result of melting or scraping due to the heat or the pressure brought about by the contact with the cut surface. The film-forming material may be obtained by using a material containing paraffin or a material containing molybdenum dioxide.

Description

  The present invention relates to a cutting tool for cutting an object to be cut such as wood or metal.

  Conventionally, tools such as a saw, a canna, a chona, and a chisel have been used as tools for cutting wood. In recent years, electric tools have been introduced, making it easier to cut wood. When wood is cut using these tools, a wood conduit appears on the cut surface. For this reason, when the humidity is high, the wood absorbs moisture and causes a dimensional change. As a technique for suppressing such a dimensional change of wood, a technique for impregnating wood with water and a technique for applying a resin to the mouth of the wood are known (see, for example, Patent Documents 1 to 3).

JP 2001-113504 A JP-A-9-57711 JP 60-248316 A

  However, in the above-described prior art, it is necessary to perform a process for suppressing the dimensional change of the wood separately from the cutting of the wood. there were.

  This invention is made | formed in view of the above, Comprising: It aims at providing the cutting tool which can implement | achieve reduction of the man-hour and the shortening of processing time which are performed with cutting.

  In order to solve the above-described problems and achieve the object, a cutting tool according to the present invention is a cutting tool for cutting an object to be cut, which contacts the cutting surface of the object during cutting, and the cutting tool A film forming member made of a solid that forms a film on the cutting surface by melting or scraping caused by heat or pressure generated by contact with the surface, respectively, is provided.

  The cutting tool according to the present invention is characterized in that, in the above invention, the film forming member is made of a material containing paraffin.

  The cutting tool according to the present invention is characterized in that, in the above invention, the film forming member is made of a material containing molybdenum dioxide.

  Further, the cutting tool according to the present invention is the above-described invention, wherein the cutting tool has a disk shape, extends in the radial direction of the disk and has a plurality of holding holes for holding the film forming member, and the outer periphery of the main body section. A plurality of blades, and an elastic member that connects the film forming member held by the holding hole to the main body, wherein the holding hole extends in a radial direction on the surface of the main body. And a penetrating portion that communicates with the groove portion and penetrates the main body portion, and the elastic member is disposed so as to be stretchable along a direction in which the groove portion extends, and the film forming member is It arrange | positions to the penetration part, It is characterized by the above-mentioned.

  Moreover, the cutting tool according to the present invention covers the outer periphery of the twist drill having a spiral blade portion and a groove portion in the above invention, and can advance and retreat along the longitudinal direction independently of the twist drill. A pipe member, wherein the film forming member has a spiral shape along the groove portion, and a proximal end portion is fixed to the twist drill.

  According to the present invention, when an object to be cut is cut, it comes into contact with the cutting surface of the object, and a film is formed on the cutting surface by melting or scraping caused by heat or pressure generated by the contact with the cutting surface, respectively. Since the film forming member made of solid is provided, the film can be formed on the cutting surface at the same time as the cutting is performed. Therefore, it is possible to reduce the man-hour to be performed with cutting and to shorten the processing time.

FIG. 1 is a diagram showing a configuration of a cutting tool according to Embodiment 1 of the present invention. 2 is a partial cross-sectional view taken along line AA in FIG. FIG. 3 is a diagram showing a state in which the cutting tool according to Embodiment 1 of the present invention is cutting wood. 4 is a partial cross-sectional view taken along line BB in FIG. 5 is a partial cross-sectional view taken along the line CC of FIG. FIG. 6 is a partial cross-sectional view showing a configuration of a cutting tool according to Embodiment 2 of the present invention. FIG. 7 is a diagram showing a state where the cutting tool according to Embodiment 2 of the present invention is cutting wood.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described with reference to the accompanying drawings. Note that the drawings referred to in the following description are schematic, and when the same object is shown in different drawings, dimensions, scales, and the like may be different.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a cutting tool according to Embodiment 1 of the present invention. 2 is a partial cross-sectional view taken along line AA in FIG. The cutting tool 1 shown in these drawings is realized by using tool steel such as high-speed tool steel or high-chromium alloy tool steel or cemented carbide, and has a disk-shaped main body 2 and an outer periphery of the main body 2. The plurality of blade bodies 3 provided through the center of the main body 2 and projecting from the surface of the main body 2 under the centrifugal force generated by rotation about the axis orthogonal to the main surface of the main body 2 The film forming member 4 made of a solid that forms a film on the cutting surface by contacting with the cutting surface of the wood that is the object to be cut during cutting, and the body portion 2 is extendable in the radial direction of the disk. And a coil spring 5, which is an elastic member that connects the film forming member 4.

  The main body 2 has a plurality of holding holes 21 that extend in the radial direction of the disk and hold the film forming member 4. As shown in FIG. 2, the holding hole 21 includes a groove portion 21 a provided along the radial direction on the surface of the main body portion 2, and a through portion that communicates with the outer peripheral end of the groove portion 21 a and penetrates the main body portion 2. 21b. The penetration part 21b penetrates the main body part 2 along an oblique direction intersecting with the radial direction of the main body part 2, and the opening on the surface opposite to the groove part 21a is closer to the main body than the opening on the side communicating with the groove part 21a. It is located on the outer peripheral side of the part 2.

  The film forming member 4 forms an ellipsoid having a diameter substantially equal to the diameter of the penetrating portion 21b, and when the cutting tool 1 is stationary, as shown in FIG. Yes. The film forming member 4 is made of a material containing paraffin.

  One end of the coil spring 5 is fixed to the proximal end portion of the groove 21 a, and the other end is fixed to the film forming member 4.

  FIG. 3 is a diagram illustrating a state in which the cutting tool 1 having the above configuration is cutting the wood W to be cut. 4 is a partial cross-sectional view taken along line BB in FIG. 3, and FIG. 5 is a partial cross-sectional view taken along line CC in FIG. When the cutting tool 1 passes through the center of the main body 2 and rotates around an axis orthogonal to the main surface of the main body 2, the film forming member 4 receives a centrifugal force. As a result, the film forming member 4 is pushed out from the through portion 21b and protrudes from the surface of the main body 2 as shown in FIG. At this time, the film forming member 4 is prevented from coming off from the penetrating portion 21 b by the coil spring 5. In addition, the protrusion amount from the main-body part 2 of the film formation member 4 when the cutting tool 1 is rotating is determined according to the rotational speed of the cutting tool 1 and the inclination angle of the penetration part 21b with respect to the groove part 21a.

  When the film forming member 4 comes into contact with the cutting surface of the wood W, the coating forming member 4 receives a drag force from the wood W as shown in FIG. In a state where the film forming member 4 is in contact with the cutting surface of the wood W, the paraffin of the film forming member 4 is melted by frictional heat generated by contact with the cutting surface of the wood W and adheres to the cutting surface of the wood W. Form a film. Since the cutting tool 1 is provided with a plurality of film forming members 4, when the wood W is cut while the cutting tool 1 is rotated, a film is uniformly formed on the cutting surface.

  Thus, the cutting tool 1 forms the paraffin film on the cutting surface of the wood W at the same time as the wood W is cut. Therefore, it is possible to seal the cutting surface of the wood W and prevent moisture from entering without performing a process different from the cutting.

  The first embodiment can be applied not only to cutting wood W but also to cutting metal. When the cutting tool 1 is applied for metal cutting, for example, a solid lubricant made of a material containing molybdenum disulfide may be used as the film forming member 4. In this case, the film forming member 4 is scraped by receiving pressure due to contact with the metal cutting surface, and the shaved component adheres to the cutting surface to form a film. As a result, the step of applying the lubricant need not be performed as a separate step from the cutting.

  According to the first embodiment of the present invention described above, when the object to be cut is cut, the film forming member 4 provided on the main body 2 can simultaneously perform the process of forming a film on the cutting surface. Therefore, it is possible to reduce the processing time by reducing the number of man-hours that accompany cutting.

(Embodiment 2)
FIG. 6 is a partial cross-sectional view showing the configuration of the cutting tool according to Embodiment 2 of the present invention. The cutting tool 6 shown in the figure is formed using tool steel or cemented carbide such as high-speed tool steel or high-chromium alloy tool steel, and a twist drill 7 having a spiral blade portion and a groove portion, and a twist drill 7. A belt-shaped film forming member 8 made of a solid that forms a film on the cutting surface by melting the cutting surface of the wood that is the object to be cut by the centrifugal force generated by the rotation of the twist drill 7. And a hollow pipe member 9 that covers the outer periphery of the twist drill 7.

  The twist drill 7 has blade portions 71 and groove portions 72 that alternately spiral, and a base portion 73 that is provided at the base end portions of the blade portions 71 and the groove portions 72 and is connected to a rotary drive device for a drill (not shown). .

  The base end portion of the film forming member 8 is fixed to the twist drill 7 and is wound spirally along the groove 72. The film forming member 8 is made of a material containing paraffin.

  The base end portion of the pipe member 9 is attached to the above-described rotation drive device, and can be advanced and retracted in the longitudinal direction independently of the twist drill 7. The pipe member 9 is realized using metal or resin.

  FIG. 7 is a partial cross-sectional view showing a situation in which the wood W is started to be cut using the cutting tool 6 having the above configuration. As shown in FIG. 7, when the twist drill 7 is rotated with the tip of the twist drill 7 slightly protruded from the pipe member 9 and in contact with the wood W, the tip of the twist drill 7 enters the inside of the wood W. start. The film forming member 8 receives a centrifugal force generated by the rotation of the twist drill 7 and is slightly lifted in the outer peripheral direction from the groove 72. In this state, the pipe member 9 suppresses the film forming member 8 from rotating greatly away from the twist drill 7. Thus, the pipe member 9 may come into contact with the film forming member 8 when the cutting tool 6 rotates. Therefore, if a coating made of fluororesin or the like having good slidability is formed on the inner peripheral surface of the hollow portion of the pipe member 9, friction is reduced even when the coating forming member 8 contacts the inner peripheral surface during rotation. It is possible to prevent the film forming member 8 from being melted by the contact with the pipe member 9, which is more preferable.

  In the case shown in FIG. 7, since the tip of the film forming member 8 has entered the wood W, the tip of the film forming member 8 is sandwiched between the twist drill 7 and the wood W. Therefore, both ends of the film forming member 8 are substantially fixed, and the twist drill 7 gradually enters the wood W following the entry of the twist drill 7 into the wood W. At this time, the film forming member 8 is pressed against the cutting surface of the wood W by centrifugal force, melted by friction with the wood W, and forms a film on the cutting surface.

  Thus, the cutting tool 6 forms the paraffin film on the cutting surface of the wood W at the same time as the wood W is cut. Therefore, it is possible to seal the cutting surface of the wood W and prevent moisture from entering without performing a process different from the cutting.

  In the second embodiment as well, a cutting tool 6 suitable for metal cutting can be realized by forming the film forming member 8 with a solid lubricant made of a material containing molybdenum dioxide.

  According to the second embodiment of the present invention described above, since the coating film forming member 8 having a belt shape is provided along the groove portion 72 of the twist drill 7, the coating film on the cutting surface when the object to be cut is cut. Formation can occur simultaneously. Therefore, it is possible to reduce the processing time by reducing the number of man-hours that accompany cutting.

  Up to this point, the mode for carrying out the present invention has been described. However, the present invention should not be limited only by the two embodiments described above. For example, the film forming member can be realized using a material containing fluorine such as a fluororesin.

  The present invention can also be applied to cutting tools such as end mills and milling cutters.

  As described above, the present invention can include various embodiments and the like not described herein, and appropriate design changes and the like are made without departing from the technical idea specified by the claims. It is possible.

DESCRIPTION OF SYMBOLS 1, 6 Cutting tool 2 Main body part 3 Blade body 4, 8 Film formation member 5 Coil spring 7 Twist drill 9 Pipe member 21 Holding hole 21a, 72 Groove part 21b Through part 71 Blade part 73 Base part W Wood

Claims (5)

A cutting tool for cutting an object to be cut,
Provided with a film forming member made of a solid that comes into contact with the cutting surface of the object during cutting and forms a film on the cutting surface by melting or scraping caused by heat or pressure generated by the contact with the cutting surface, respectively. A cutting tool characterized by that.   The cutting tool according to claim 1, wherein the film forming member is made of a material containing paraffin.   The cutting tool according to claim 1, wherein the film forming member is made of a material containing molybdenum dioxide. A main body having a disk shape and having a plurality of holding holes extending in the radial direction of the disk to hold the film-forming member;
A plurality of blade bodies provided along the outer periphery of the main body,
An elastic member for connecting the film forming member held by the holding hole to the main body;
With
The holding hole is
A groove extending in the radial direction of the surface of the main body,
A through portion communicating with the groove portion and penetrating the main body portion;
Have
The elastic member is disposed so as to be stretchable along a direction in which the groove extends, and the film forming member is disposed in the penetrating portion. Cutting tools. A twist drill having a helical blade and a groove;
A pipe member that covers the outer periphery of the twist drill and is capable of advancing and retreating along the longitudinal direction independently of the twist drill;
With
The film-forming member is
The cutting tool according to any one of claims 1 to 3, wherein the cutting tool has a spiral shape along the groove portion, and a base end portion is fixed to the twist drill.

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