KR100635468B1 - Cutting tools with a separative tip portion and method for coupling tip portion - Google Patents

Abstract

A cutting tool having a separate tip portion and a method for bonding the tip portion are provided to easily exchange a sank portion and the tip portion in the field by easily bonding and separating the sank portion and the tip portion. A cutting tool includes a sank portion(100) and a tip portion(200). The sank portion has a bonding surface in which prominences and depressions are formed. The tip portion has a bonding surface corresponding to the bonding surface of the sank portion so as to be bonded to the sank portion. The bonding surface of the tip portion also has prominences and depressions. A portion in which the bonding surface of the sank portion and the bonding surface of the tip portion is superposed has an engagement hole(310). The sank portion and the tip portion are engaged with each other by an engagement member connecting the engagement hole.

Description

CUTTING TOOLS WITH A SEPARATIVE TIP PORTION AND METHOD FOR COUPLING TIP PORTION}

1 is a perspective view showing a cutting tool according to the prior art.

Figure 2 is a perspective view showing a cutting tool detachable tip portion according to the present invention.

Figure 3a or Figure 3b is a side cross-sectional view showing the joining surface of the shank portion and the tip portion of the cutting tool removable tip portion according to the present invention.

Figures 4a to 4c is a side cross-sectional view showing the joining surface of the shank portion and the tip portion of the cutting tool detachable tip portion according to another embodiment of the present invention.

5a or 5b is a detailed cross-sectional view showing the joining surface of the shank portion and the tip portion of the cutting tool detachable tip portion according to another embodiment of the present invention.

Figure 6 is a perspective view showing a cutting tool detachable tip portion according to another embodiment of the present invention.

<Code Description of Main Parts of Drawing>

100 ... shank 200 ... tip

300 ... fastener 310 ... fastener

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool, and more particularly, to a cutting tool in which the tip portion is detachable from the shank portion, and a method of joining the tip portion of the cutting tool.

In general, in the field of construction and civil engineering, cutting tools for cutting stone, metal concrete, asphalt, brick, pipe, etc. are a plurality of cutting tips made by mixing, forming, and sintering diamond particles and metal powder of specific components. Is welded to a shank of a predetermined thickness made of a metal such as carbon tool steel or carbon alloy steel. That is, a diamond particle of a predetermined size and a metal powder of a predetermined size and component are mixed, and the mixture of the mixed diamond metal powder is pressed by a molding machine to form into cutting tips of a predetermined shape, and the formed cutting tips are separated by a separate sintering furnace. After sintering by the sintered cutting tips are welded to the body by a separate welding device.

In particular, among the cutting tools, core drills are used to drill holes in necessary parts of pre-built architectural and civil concrete structures, or to collect samples for drilling holes in necessary parts during repair work, or for testing the strength of hard-to-reach stone and concrete structures. Used. Such a cutting tool is composed of a shank portion coupled to a power tool such as a drill and a tip portion including a tip coupled to the shank portion and performing a substantial cutting operation, and these are joined to each other by silver welding, laser welding or resistance welding. Are bonded.

However, such a welding part may cause the tip part to fall easily even with a small impact, thereby shortening the life of the tool, and causing a safety accident such as injuries to the operator when the tip part falls off, and the tip part is worn or broken and cut. If the work is not possible, there is a problem that the loss of material as well as the waste of cutting tool material increases, such as the entire shank portion of the tip portion, that is, the cutting tool itself.

In addition, as shown in FIG. 1, when the tip portion 20 including the shank portion 10 and the tip 21 are coupled to each other by screwing, the shank portion 10 and the tip portion 20 are coupled to each other. A female thread and a male thread are formed on the part, and in order to form such a thread, the thickness of the shank part 10 and the tip part 20 must be manufactured to a predetermined thickness or more, and as a result, the weight of the product becomes heavy and the cutting process is performed. There was a problem that the machinability was significantly lower.

An object of the present invention for improving the above problems, it is to make the joining and separation of the tip portion coupled to the shank portion can be easily made in the workplace.

Another object of the present invention is to reduce the weight of the cutting tool and to increase the machinability of the product by simplifying the structure for easy handling.

In order to achieve the above object, the present invention includes a shank portion having a concave-convex joining surface and a tip portion having a concave-convex joining surface corresponding to a joining surface of the shank portion to be joined to the shank portion, and joining the shank portion In the portion where the joint surface of the surface and the tip portion overlap, a fastening hole is formed therethrough, and the shank portion and the tip portion are fastened to each other by a fastening member connecting the fastening hole.

In addition, the cross section of the joining surface of the shank portion and the tip portion of the present invention may be made of any one of a V groove, W type, step type, groove type, the tip portion formed integrally with the tip support and one end of the tip support Comprising a plurality of tips, the other end of the tip support portion may be formed with a concave-convex joining surface, the tip portion may each include a plurality of tips having a concave-convex joining surface.

In addition, the fastening member of the present invention is made of a pin, the pin is inserted into the fastening hole, the cutting tool is a polishing cup, profiler, end mill, straight wheel, ID wheel, rotary dresser, edge grinding wheel, It may be made of any one of the core drill.

The present invention includes a shank portion having a concave-convex joining surface and a tip portion having a concave-convex joining surface corresponding to the joining surface of the shank portion so as to be joined to the shank portion, wherein the shank portion and the tip portion overlap each other. And preparing a cutting tool in which a tip portion having a penetrating hole formed therein is separated, and joining the shank portion and the tip portion to the fastening member through the fastening hole.

At this time, the step of coupling the joining surface of the shank portion and the tip portion with the fastening member, remove the foreign matter on the joining surface of the shank portion and the tip portion before the fastening member is inserted into the fastening hole and then apply an adhesive, the fastening After inserting and fastening the fastening member to the ball may further comprise a step of curing for a certain time so that the bonding surface is fixed.

In addition, the step of coupling the joining surface of the shank portion and the tip portion with a fastening member according to the present invention, the foreign matter on the joining surface of the shank portion and the tip portion before the fastening member is inserted into the fastening hole to remove, the tip Applying heat to the joint surface of the part and applying it with a thermoplastic adhesive, and bonding the shank part and the tip part together, and reheating the joint part for wettability of the adhesive. Fixing with an adhesive, it may further comprise curing after cooling.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the cutting tool of the present invention corresponds to the joining surface of the shank portion 100 to be joined to the shank portion 100 having the concave-convex joining surface 110 and the shank portion 100. And a tip portion 200 having a joint surface 210 to be formed, and a fastening hole 310 is formed at a portion where the shank portion 100 and the tip portion 200 overlap with each other to fasten the penetrating hole 310. The shank portion 100 and the tip portion 200 are joined to each other by the member 300.

In this case, the tip part 200 includes a tip support part 260 and a plurality of tips 230 integrally formed at one end of the tip support part 260, and the other end of the tip support part 260 has a concave-convex shape. Face 210 is formed. In addition, an adhesive may be applied to the joint surface of the shank part 100 and the tip part 200.

As shown in FIG. 3A or 3B, the joint surface 210 of the tip portion 200 having the joint surface 110 and the tip 230 of the shank portion 100 may have a stepped cross section. That is, when the joining surface 210 of the shank portion 100 is formed in a step shape having a 'b' shape, the joining surface 210 of the tip portion 200 joined to the shank portion 100 is 'a'. It is formed in the shape of a child is formed so that the joining surface 210 of the shank portion 100 and the tip portion 200 is engaged with each other.

Unlike this, as shown in FIGS. 4A to 4C, the cross section of the joining surface 210 of the shank part 100 and the tip part 200 may be formed in a V groove, a W shape, and a groove shape. For example, when the joint surface 110 of the shank portion 100 is formed in the V-groove, W-shaped, groove-shaped, the joint surface of the tip portion 200 is also formed in a shape that meshes with the joint surface 110 of the shank portion 100. Can be. Of course, the shape of the joining surfaces 110 and 210 is not limited to this, and the joining surface 110 of the shank portion 100 and the joining surface 210 of the tip portion 200 joined corresponding thereto are joined to the joining surface 110. It includes all the concave-convex shape that can enlarge the surface (110, 210).

In addition, a fastening hole penetrating through the shank part 100 and the tip part 200 is formed at a portion overlapping each other. At this time, the fastening hole is formed while maintaining a predetermined angle radially along the circumference of the shank portion and the tip portion. In this embodiment, four fastening holes are formed at opposite positions when the shank part 100 is coupled to the tip part 200 while maintaining a 90 degree angle, but the plurality of fastening holes 310 are formed at arbitrary angles. It may be formed to achieve.

The fastening member 300 is coupled to the fastening hole 310 penetrating the shank part 100 and the tip part 200 so that the mutual fastening force of the shank part 100 and the tip part 200 is enhanced to strengthen the joint strength. And, the fastening member 300 is a pin 320 is used by being fitted to the fastening hole 310 is used. In this case, an adhesive may be applied to an adhesive position of the fastening member 300 which is in direct contact with the fastening hole 310, and may be applied to the fastening hole 310 of the tip part 200 which is in contact with the fastening member 300. Adhesive may also be applied.

In another embodiment, the fastening member 300 may be a screw, as shown in Figure 5a, the screw 350 is in the overlapping portion of the shank portion 100 and the tip portion 200 formed in a groove shape. Is coupled to the formed fastening hole 310, so that the head of the screw 350, the concave mounting portion of the shape that can be seated so that the head of the screw 350 does not protrude to the shank portion 100 or the tip portion 200 It may be formed in, the female thread to which the screw 350 is rotationally coupled may be formed in the fastening hole (310). At this time, the female thread is formed at least in the fastening hole formed in the shank portion 100 or the tip portion 200 in which the concave mounting portion is not formed. In addition, as shown in Figure 5b, the fastening member 300 may be composed of a bolt 330 and a nut 340, so that the bolt 330 and the nut 340 does not protrude to the outside ( A mounting portion having a shape in which the 330 and the nut 340 may be mounted may be formed in the shank portion 100 and the tip portion 200, respectively.

In another embodiment, as shown in FIG. 6, the tip part 200 may be formed of a plurality of tips 230 ′ having respective joining surfaces 210 ′ of concave-convex shapes. For example, the shank portion 100 is formed with a concave-convex joining surface 110 ′, and corresponds to the joining surface 110 ′ of the shank portion 100 such that the shank portion 100 is joined to the tip 230 ′. A joining surface 210 ′ is formed at the mating end of the tip 230 ′. The shank part 100 is formed by a fastening member 320 'formed at a portion where the shank part 100 and the tip 230' overlap with the fastening hole 310 '. And the tip 230 'are bonded to each other, and at this time, an adhesive may be applied to the joining surfaces 210' and 110 'of the shank portion 100 and the tip 230'.

Hereinafter, the joining method of the shank portion and the tip portion according to the present invention described above is as follows.

The joining method according to the present invention includes a shank portion having a concave-convex joining surface and a tip portion having a concave-convex joining surface corresponding to a joining surface of the shank portion to be joined to the shank portion, wherein the shank portion and the tip portion A cutting tool having a separate tip portion having a fastening hole penetrating the overlapping portion is prepared, and the joining surface of the shank portion and the tip portion is coupled to the fastening member through the fastening hole.

First, when preparing the shank portion and the tip portion, end portions of the shank portion and the tip portion joined to enlarge the joining surface of the shank portion and the tip portion to be joined and increase the tightening force are formed as the uneven surface. For example, when the cross section with respect to the joining surface of the shank portion is formed in a stepped shape, the joining surface of the tip portion joined to the shank portion is formed in a shape corresponding to the stepped shape.

In addition, the shank and the tip to form a fastening hole passing through the overlapping portion. At this time, the fastening member is inserted into the fastening hole to connect the shank part and the tip part so that the fastening force of the shank part and the tip part is enhanced so that the joint strength is reinforced. In this embodiment, the fastening member is used as a pin. It is preferable that the shape of is made into the shape which can be fitted to a pin. In another embodiment, when the fastening member is composed of a screw or bolt, a female thread may be formed in the fastening hole so that the screw or bolt is rotationally coupled when the fastening member is inserted into the fastening hole.

When the joining surface is joined with the fastening member, the prepared joining surface of the shank portion and the tip may be bonded to each other using an adhesive. First, foreign matters are buried in the joining surface of the uneven shape before joining the shank portion and the tip portion. By eliminating this prevents the adhesive force is reduced by the foreign matter when joining the shank portion and the tip portion. Then, after applying the adhesive to the concave-convex joining surface formed on the shank portion and the tip portion, the shank portion and the tip portion are relatively rotated about 10 times so as to increase mutual adhesion of the shank portion and the tip portion. Subsequently, the fastening member may be inserted into and fixed by a fastening hole penetrating the shank portion and the tip portion. An adhesive may be applied to an adhesive position of the fastening member in direct contact with the fastening hole, and the adhesive may also be fastened to the fastening hole of the tip portion. Can be applied. After rotating the shank portion and the tip portion to uniformly mix the adhesive, the portion bonded by the adhesive is cured for about 12 hours to make it usable.

At this time, since the adhesive is usually bonded in a state of low molecular weight, a thermosetting adhesive that requires compression is used. That is, a phenol resin adhesive, a resorcinol resin adhesive, a melamine resin adhesive, an epoxy resin adhesive, a polyurethane adhesive, etc. are used. In particular, the epoxy resin adhesive has a very high adhesive strength, excellent mechanical properties and electrical properties, and chemical resistance. Excellent durability.

In this way, if the tip of the tip is damaged while working with the manufactured cutting tool, and the cutting operation is no longer possible, use a suitable solvent corresponding to the thermosetting adhesive used to weaken the adhesive force and then the tip from the shank part. In particular, in the case of the water-soluble adhesive using water as a solvent, the connection part by the adhesive of the shank part and the tip part can be easily immersed in water, and the shank part and the tip part can be separated from the water. The time which can be used is preferably about 24 hours.

In another embodiment, the process of adhering the prepared joining surface of the shank portion and the tip portion to each other using an adhesive, using a glue gun, a thermoplastic adhesive is applied to the joining surface of the uneven tip portion corresponding to the joining surface of the shank portion. Apply at high temperature, join the shank to the tip and reheat the joint applied with the thermoplastic adhesive for wettability of the adhesive. In this case, the fastening member may be inserted into and fastened with a fastening hole formed in the shank portion and the tip portion, and then fixed again with a thermoplastic adhesive. Subsequently, after cooling the joining surface of the shank portion and the tip portion, the cooled joining surface can be cured to make it usable.

In this case, the thermoplastic adhesive used is a hot melt adhesive, which is a solid thermoplastic adhesive heated to a high temperature, melted, applied to an adherend, and pressed. Typical adhesives include EVA (Ethylene-Vinyl Acetate Copolymer), and acrylic resin adhesives, α-cyano acrylates, and the like may also be used.

When separating the shank portion and the tip portion bonded in this manner, the bonded portion bonded by the thermoplastic adhesive is heated with a heating source for a predetermined time, and then the fastening member joined to the fastening hole of the shank portion and the tip portion is removed. The shank part and the tip part can be separated from each other.

While the invention has been shown and described with respect to specific embodiments thereof, it will be appreciated that the invention can be variously modified and varied without departing from the spirit or scope of the invention as provided by the following claims. do.

For example, the cutting tool of the present invention is not only a core drill but also a polishing cup, a profiler, an end mill, a straight wheel, and an ID wheel. It is also applicable to cutting tools such as wheels, rotary dressers and edge grinding wheels.

As described above, according to the present invention, the shank portion and the tip portion can be easily joined and separated, so that the shank portion can be easily exchanged in the field, the shank portion can be recycled, and the price competitiveness is greatly increased, thereby improving sales. have.

In addition, the present invention can extend the life of the tool by minimizing the warp and torsion caused by the loosening of the shank portion generated in the product in the process of use when heat treatment, such as mutual welding, by the simple fastening method.

In addition, the present invention has the advantage that the machinability of the product is increased can be a lot of work in a short time, the processing can be made quickly.

In addition, the present invention adheres the shank portion and the tip portion, and the bonding surface is fastened and fixed again by the fastening member, so that not only the tightening force of the shank portion and the tip portion can be strengthened, but also the metal bonding strength is increased, and the cutting efficiency is achieved at an excellent drilling speed. Can promote.

In addition, the present invention can be replaced by anyone, even if skilled workers can be accurately replaced with the advantage of improving the cutting efficiency, it is easy to separate the damaged tip has the effect of reducing the processing time required for cutting the workpiece.

Claims (12)

A shank portion 100 having a concave-convex joining surface and a tip portion 200 having a concave-convex joining surface corresponding to a joining surface of the shank portion 100 so as to be joined to the shank portion 100, In the portion where the joint surface of the shank portion 100 and the joint surface of the tip portion 200 overlap, a fastening hole 310 penetrating therethrough is formed, and the fastening member 300 connects the fastening hole 310. The cutting part is removable cutting tool, characterized in that the shank portion 100 and the tip portion 200 is fastened to each other. The method of claim 1, The joining surface is a removable cutting tool, characterized in that the tip portion is bonded to each other with an adhesive. The method of claim 1, Cross section of the joining surface of the shank portion 100 and the tip portion 200 is any one of the V-shaped groove, W type, step type, groove type cutting tool that can be separated. The method according to any one of claims 1 to 3, The tip part 200 includes a tip support part 260 and a plurality of tips 230 formed at one end of the tip support part 260, and the other end of the tip support part 260 has a concave-convex surface 210. Cutting tool which can be removed, characterized in that the tip portion is formed. The method according to any one of claims 1 to 3, The tip portion 200 is a cutting tool that can be detached tip portion, characterized in that it comprises a plurality of tips (230 ') each having a concave-convex joining surface (210'). The method according to any one of claims 1 to 3, The fastening member 300 is a cutting tool comprising a pin, the tip portion is removable, characterized in that the pin is fitted into the fastening hole (310). The method according to any one of claims 1 to 3, The fastening member 300 is a cutting tool consisting of a pin, detachable tip portion, characterized in that the adhesive is applied to the fastening hole 310 is coupled. The method according to any one of claims 1 to 3, The fastening member 300 is made of a screw, the tip portion is removable cutting tool, characterized in that coupled to the fastening hole 310 so that the head of the screw is seated on the joint surface. The method according to any one of claims 1 to 3, The cutting tools include polishing cups, profilers, end mills, straight wheels, ID wheels, rotary dressers and edge grinding wheels. A cutting tool with a detachable tip, characterized in that any one of a grinding wheel and a core drill. A fastening part including a shank portion having a concave-convex joining surface and a tip portion having a concave-convex joining surface corresponding to the joining surface of the shank portion so as to be joined to the shank portion, and penetrating the overlapping portion of the shank portion and the tip portion; Preparing a cutting tool having a separated tip portion formed with a ball, And joining the joining surface of the shank portion and the tip portion to the fastening member through the fastening hole. The method of claim 10, Coupling the joining surface of the shank portion and the tip portion with a fastening member, After the fastening member is inserted into the fastening hole, the adhesive is applied to the joint surface and then rotated several times so that the applied adhesive is mixed. After inserting and fastening the fastening member to the fastening hole tip joining method of the cutting tool, characterized in that it further comprises the step of curing for a certain time so that the joint surface is fixed. The method of claim 10, Coupling the joining surface of the shank portion and the tip portion with a fastening member, Before inserting and fastening the fastening member to the fastening hole, heat is applied to the joint surface of the tip part and applied with a thermoplastic adhesive, and the joint part and the tip part are joined to each other, and then reheated the joint part for wettability of the adhesive. Fixing the tip portion of the cutting tool further comprises the step of fixing the fastening member to the fastening hole after the thermoplastic adhesive, and curing after cooling.

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