JP4303452B2 - DLC coating method for cutting tools - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a DLC coating method for a cutting tool for cutting a soft metal having a surface hardness of 180 Hv (Vickers hardness) or less.
[0002]
[Prior art]
Examples of the soft metal having a surface hardness of 180 Hv or less include aluminum / aluminum alloy, copper / copper alloy, and brass. When cutting such a soft metal, cutting was performed as it was without coating or surface modification. For example, in order to obtain the shape as shown in FIG. 3B, the base material in the state of (A) was prepared, and the broken line portion was cut.
In this way, when the soft metal is cut as it is, the material is soft (for example, aluminum has a Vickers hardness of 20 to 100 Hv). The burr 24 was generated on the side wall portion 26 of 20. That is, since the material is soft and easy to extend, ductile fracture is likely to occur, and the burr 24 is generated.
Therefore, the present inventor applied the surface of the soft metal perpendicular to the cutting surface 20 to a surface harder than the soft metal base material 12 and then cut the surface to make the surface hard, and when cutting the workpiece to be ground with the blade. It was thought that the burr 24 would not be generated by making this mode not brittle fracture instead of conventional ductile fracture. Then, as shown in FIG. 4, the burr 24 where the cutting edge 32 of the cutting tool 30 was removed could be completely suppressed as expected.
However, the burr 24 where the side surface portion 34 of the cutting tool 30 is removed is smaller than the conventional one, but it cannot be suppressed against expectations. This is because the soft metal 10 adhered to the side surface 34 of the cutting tool 30 as shown in FIG. 5 adheres to the soft metal 10 on the inner wall of the already-cut groove, and the surface treatment portion 12 having a hard surface is formed by the rotation of the tool. It is because it has been pulled out from the material (soft part) of the soft metal 10 over it.
Therefore, when cutting the soft metal 10, the inventor performs a surface treatment 12 that is harder than the base material of the soft metal 10 on the surface of the soft metal 10 that is perpendicular to the cutting surface 20. The surface should be very smooth, and the DLC coating 36, which is very good in terms of wear resistance, adhesion resistance, low coefficient of friction, mold release, etc., should be applied for cutting. Thought. Then, as shown in FIG. 6, all the burrs were able to be suppressed.
[0003]
[Problems to be solved by the invention]
As described above, when cutting a soft metal, the surface of the soft metal 10 perpendicular to the cutting surface 20 is subjected to a surface treatment 12 that is harder than the base material of the soft metal 10 and a DLC coating 36 is applied to the cutting tool. It has been found that all burrs can be suppressed by cutting.
Conventionally, DLC coating has been applied to the cutting edge of cutting tools (for example, drills and end mills) to prevent the cutting edge from becoming a built-up cutting edge. The DLC coating was not applied to the side surface portion.
When the DLC coating is applied to the side surface portion of the cutting tool, there is a problem that the DLC coating does not adhere well to the side surface of the blade edge portion due to the edge effect that the current density of the blade edge portion increases.
If the DLC coating is not attached to the side surface of the cutting edge portion of the cutting tool, the generation of burrs cannot be suppressed when the soft metal is cut.
[0004]
An object of the present invention is to provide a method in which a DLC coating can be easily applied to the side surface of a cutting edge portion of a cutting tool so that a burr 24 does not occur even when the soft metal 10 is cut.
[0005]
[Means for Solving the Problems]
An object of the present invention, a metal saw, in DLC coating process to slotting cutter or slotted cutting tool 30 of the milling, all of the cutting edge 32 portion of the cutting tool 30, larger 0.2~10mm than the thickness of the cutting tool 30 This can be achieved by applying a DLC coating to the cutting tool 30 by providing an edge effect in the vicinity of the outer periphery of the metal plate 38 by covering the metal plate 38 so as to be in contact with the metal plate 38 having a width.
The DLC coating 36 is an abbreviation for diamond-like carbon, which is an amorphous carbon film mainly composed of carbon and hydrogen, and has a hardness close to that of diamond.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Based on the drawings, a DLC coating method for the cutting tool 30 of the present invention will be described.
FIG. 1A is a partial perspective view of a cutting tool with a cutting edge covered with a metal plate or the like, and FIG. 1B is a side view of a cutting tool covered with a metal plate or the like. ) Is a cross-sectional view cut at the center of (B). FIG. 2 is an explanatory view of a specific example covered with a metal plate or the like as shown in FIG.
The present invention relates to a method of applying the DLC coating 36 on the cutting tool 30, the cutting tool 30 is slotting cutter Yasuriwari off rice such similar metal saw and it can be considered. That is, the side surface 34 of the blade tip 32 portion has a portion that is not a blade.
The purpose of applying the DLC coating 36 on the cutting tool 30 is for the material of the soft metal 10 during cutting prevents the adhesion to the cutting tool 30. Further, since the DLC coating 36 has an amorphous shape unlike diamond, the surface is very smooth, and is excellent in terms of wear resistance, adhesion resistance, low friction coefficient, releasability, and the like. Yes.
[0007]
If the DLC coating 36 is applied to the side surface 34 of the cutting tool 30 in the state of the cutting tool as it is, the DLC coating 36 does not adhere well to the cutting edge 32 portion as described in the problem. In view of this, the present inventor considered that there is a method of not using the cutting edge 32 of the cutting tool 30 as an edge, and considered covering the cutting edge 32 with a metal plate 38 or the like as shown in FIG. That is, by covering all the blade tips 32 so as to contact the metal plate 38 and the like, the blade tips 32 are not edges as shown in FIG. 1C, and the edge effect is transferred to the outer peripheral portion of the metal plate 38 and the like. Become.
The size of the metal plate 38 or the like may be any size as long as the edge of the cutting edge portion 32 of the cutting tool 30 is eliminated and the edge moves to the metal plate 38, and is about 0.2 to 10 mm larger than the thickness of the cutting tool 30. It is sufficient if it protrudes somewhat on both sides of the cutting tool 30 when covered. On the other hand, if the protruding amount is too large, it will be difficult to attach DLC to the side surface 34 at the tip of the blade tip 32.
A specific example of FIG. 1 will be described with reference to FIG. As shown in FIG. 2B, a protrusion 40 is provided on one end side of the metal plate 38, and a retaining hole 42 is provided on the other end side as shown in FIG. A tape or the like is pasted on the side opposite to the side from which the protrusion 40 protrudes on one end side where the protrusion 40 is provided.
One cutting edge 32 of the cutting tool 30 is hooked on the protrusion 40, and the side provided with the retaining holes 42 is pulled so that all the cutting edges 32 are covered with the metal plate 38, and temporarily fixed with tape. After that, the metal plate 38 is fixed so as not to be detached from the cutting tool 30 by welding or caulking, and then a bolt is inserted into the retaining hole 42 at a predetermined position in the apparatus for performing the DLC coating 36 so that the metal plate 38 is covered. The cutting tool 30 is fixed so as not to fall down. If the side surface 34 of the cutting tool 30 is fixed so as to be perpendicular to the spray port of the DLC 36 and the fixed base is rotated, both side surfaces 34 of the cutting tool 30 can be DLC coated 36 at a time. .
[0008]
If at least the applied to the range from the cutting edge 32 tip of 3mm on each side 34 portions of the cutting edge 32 of the well as when at least the cutting tool 30 to be applied to both side surfaces 34 parts by of the cutting edge 32 of the cutting tool 30 is not subjected to DLC coating Mask the part.
[0009]
【The invention's effect】
As is apparent from the above description, according to the DLC coating method for the cutting tool 30 according to the present invention, the following excellent effects can be obtained.
(1) after covering all of the cutting edge 32 portion of the cutting tool 30, the Since cutting tool 30 is subjected to DLC coating 36, without edge effects occur in the cutting edge 32 portions, the side surface of reliably cutting 32 parts A DLC coating 36 could be applied to 34.
(2) By using the metal plate 38 as shown in FIG. 2, all the cutting edges 32 of the cutting tool 30 can be easily covered, and the DLC coating 36 can be reliably applied to the side surface 34 of the cutting tool 30. .
(3) When the soft metal 10 is cut, the surface of the soft metal 10 perpendicular to the cutting surface 20 is subjected to the hard surface treatment 12 and the cutting tool 30 is subjected to the DLC coating 36 for cutting. Therefore, burrs 24 are not generated on the surface side from which the cutting edge 32 comes off and on the side wall portion 26 of the cutting surface 20.
(4) Since the DLC coating 36 is applied to the cutting tool 30, the soft metal 10 material does not adhere to the cutting tool 30 during cutting, and the generation of burrs 24 can be suppressed.
[Brief description of the drawings]
FIG. 1A is a partial perspective view of a state in which a cutting edge portion of a cutting tool is covered with a metal plate or the like.
(B) It is a side view of the state which covered the cutting tool with the metal plate etc.
(C) It is sectional drawing cut | disconnected in the center of (B).
FIG. 2 is an explanatory diagram of a specific example covered with a metal plate or the like as in FIG.
FIG. 3A is a perspective view of a soft metal base material before cutting.
(B) It is explanatory drawing of the generation | occurrence | production state of the burr | flash after a cutting process.
FIG. 4 is a state diagram of the cut object after the surface treatment is performed on the cut object and cut.
FIG. 5 is an explanatory diagram of problems in the state of FIG. 4;
FIG. 6 is a perspective view of a soft metal after cutting.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Soft metal 12 Surface treatment layer 14 A surface 20 Cutting surface 24 Burr 26 Side wall part 30 Cutting tool 32 Cutting edge 34 Side surface 36 DLC coating 38 Metal plate 40 Protrusion 42 Holding hole

Claims (1)

In a DLC coating method on a metal saw, groove milling or sliding milling cutting tool,
Wherein all of the cutting edge portion of the cutting tool, made to have an outer peripheral edge effects in the vicinity of the cutting tool the metal plate by more 0.2~10mm cover in contact with a metal plate having a width greater thickness, the cutting A DLC coating method for a cutting tool, wherein the tool is subjected to DLC coating.

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