JP3954787B2 - Throwaway tip - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a throw-away tip, and more particularly, to a throw-away tip suitable for miniaturized inner diameter processing and grooving for small products such as OA equipment parts, electronic parts, and small-diameter bearings.
[0002]
[Prior art]
Conventionally, as an internal diameter machining cutting tool, as shown in FIG. 5, a throw-away type in which a tip 22 is detachably fixed to a tip portion of a holder 21, and a tip 32 is attached to a tip portion of a holder 31 as shown in FIG. As shown in FIG. 7, a brazed die with brazing, and an integrated tip 45 in which a blade edge portion 44 and a shank portion 43 are cut out from one cylindrical body were used. In FIG. 7, reference numeral 46 denotes a holder.
[0003]
Of these, the brazing type shown in FIG. 6 requires time and skill to correct and polish the cutting edge when the cutting edge breaks, and efficiency is not improved. Therefore, in most cases, the throw-away type shown in FIG. And the integral type shown in FIG. 7 is used.
[0004]
Note that the throw-away type shown in FIG. 5 is generally used for machining large-sized products such as automobile parts, and an integral type is used for machining small-sized products such as OA equipment parts and electronic parts. ing.
[0005]
As shown in FIG. 7 , the integrated tool generally includes a tip 45 composed of a processing portion 44 and a shank portion 43, and a holder 46 for fixing and supporting the tip 45.
The chip 45 is usually manufactured by cutting out from a cylindrical body, but in order to unify the holder 46, the diameter l ₁ of the shank portion 43 is the same, and a desired shape is obtained by changing the shape (diameter) of the processed portion 44. It is applied to inner diameter processing.
[0006]
[Problems to be solved by the invention]
However, in the integrated type shown in FIG. 7, since the set bolt 47 is fastened and fixed to the shank portion 43 of the chip 45 from the outside of the holder 46, the force for restraining the chip 45 is weak, and chatter vibration is likely to occur. There was a problem that. There is also a problem that the position accuracy of the blade edge 44 is poor. Furthermore, since the end face of the holder 46 is positioned so as to completely close the workpiece during the inner diameter machining, there is a problem in chip dischargeability.
[0007]
Further, in the groove processing of a relatively deep end face with a small processing diameter and a narrow groove width, the base of the chip is thinned, the strength is weakened, and is easily damaged.
[0008]
In view of such problems of the prior art, the present invention can be applied to ultra-small diameter machining, and the chip restraining force is large and chatter vibration is difficult to occur. It is an object of the present invention to provide a high-performance inner diameter machining tool with excellent discharge performance.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the throw-away tip of the present invention, by projecting a small-diameter rod portion along one side of the substrate sheet by a cutting insert which is provided integrally with the small diameter rod portion is a cutting edge for the end face grooving is formed on the tip end of the small diameter rod portion, a breaker groove formed on the upper surface side of the substrate sheet with a continuous to said cutting edge, said cutting edge An end surface grooving portion having a side flank surface formed with a sloped side surface, and connecting the end surface grooving portion and the flat plate-like base portion, a flat surface following the breaker groove, and the flat plate from the flat surface An intermediate portion having a curved raised surface that increases in thickness toward the thickness of the shaped base portion, and a flat base portion of the small-diameter rod-shaped portion in the portion where the flat surface and the curved raised surface are formed in the intermediate portion. side, inside which faces the side surface along And having a curved concave portion.
[0010]
[Action]
According to the above configuration, the flat base portion of the throw-away tip can be fixed to a pocket provided by cutting out the top surface of the tip of the holder. The fixed part (flat base) of the throw-away tip is exposed to the outside. For this reason, a bolt through hole is provided in the fixed part so that it can be fixed to the holder with a bolt, or a clamp piece is used. Can be firmly fixed. In short, the fixed part of the chip is like a normal flat chip, and the fixing method is as described above, either through the bolt hole to be screwed into the holder, or to the flat chip such as a clamp piece. It is sufficient to adopt a known method used. Since the chip can be firmly fixed in this way, chatter vibration can be suppressed.
[0011]
Further, according to the above throw-away tip, the small-diameter bar-shaped portion having the tip cutting edge ridge protrudes forward from the holder, so that only the small-diameter bar-shaped portion can be inserted into the machining hole to process the wall surface of the hole. But it can be processed. Furthermore, since the said process part is arrange | positioned along the side surface of a holder, the end surface of a holder does not become obstructive, and chips are discharged | emitted smoothly out of a hole.
[0012]
In addition, since the side wall portion of the small-diameter bar-shaped portion has a concave shape whose vertical cross-sectional shape is curved inward, the mechanical strength can be dramatically improved.
[0013]
Further, by providing a blade portion protruding from the side surface in a direction perpendicular to the longitudinal direction for forming a groove at the tip portion of the small-diameter rod-shaped portion, it can be used for cutting of an inner diameter screw and other inner diameter grooves.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1A is a top view of a chip for grooving an inner diameter end face according to an embodiment of the present invention, FIG. 1B is a view taken in the direction of the arrow X in FIG. 1A, and FIG. FIG. 1D is a cross-sectional view taken along the line ZZ.
[0015]
According to FIG. 1A, the planar shape of the flat base 3 of the chip 1 is such that one side of the rectangle is cut off, and the bolt holes 4 are formed in the thickness direction thereof. On the other hand, the tip side is formed as a small-diameter rod-like portion 7 that protrudes along one side surface integrally with the flat plate-like base portion 3, and its tip edge is a tip cutting edge ridge 5. Subsequently, a rake face 6 having a breaker groove 6a is formed. Moreover, as shown in FIG.1 (c), as for the end surface grooving part provided with the front-end cutting edge ridge 5, one side surface is formed in the shape of a slope, and it is set as the side flank 7a.
[0016]
As shown in FIG. 1 (d), the small-diameter rod-like portion 7 has a side wall portion 7 b on the side surface side 3 b opposed to the flat plate-like base portion 3 formed in a concave shape whose vertical sectional shape is curved inward. That is, one side wall (a ridge portion on the opposite side to the displacement direction of the small-diameter bar-shaped portion) is cut out in a curved shape with respect to a part of the flat surface 6 and the curved raised surface 6b following the breaker groove 6a. In contrast, the mechanical strength is dramatically improved. That is, as shown in FIG. 4B, when the side wall portion 7b is formed in a concave shape whose vertical cross-sectional shape is curved inward, even when the work material W as shown in FIG. The cross-sectional area of the small-diameter rod-like portion 7 can be made larger than the cross-sectional area of the chip 1 shown in FIG.
[0017]
2A and 2B show a state in which the throw-away tip according to the present invention is mounted on a holder. FIG. 2A is a plan view and FIG. 2B is a side view. For the sake of clarity, the fixing bolt is omitted.
[0018]
As shown in FIG. 2, a tip pocket 11 is provided at the tip of the upper surface 10 of the holder 9 so that the flat base 3 of the throw-away tip 1 is accommodated. A bottom surface provided on the flat base 3 of the chip 1 is placed on the chip seating surface 12 (see FIG. 5B) of the chip pocket 11, and in this state, a fixing bolt (not shown) is formed into a flat plate shape. The base 3 is inserted into the bolt hole 4 of the flat base 3 from above, and is screwed into a bolt fixing hole 13 formed in the chip seating surface 12 of the holder 9.
[0019]
By fixing the throw-away tip 1 to the holder 9 in this way, the small-diameter rod-like portion 7 of the tip 1 is projected in the longitudinal direction of the holder 9. And the small diameter rod-shaped part 7 can be inserted in the hole (not shown) of a workpiece | work, and the inner wall face of a hole can be processed.
[0020]
In addition, the flat base 3 of the throw-away tip 1 is exposed to the outside, and therefore, a bolt can be inserted as described above, or it can be firmly fixed using a clamp piece or the like, so that chatter vibration is generated. Can be suppressed.
[0021]
FIG. 3 is a schematic view of a tip for an inner diameter screw according to another embodiment of the present invention. As shown in FIGS. 3 (a) and (b), the tip portion of the small diameter rod portion 7 is used for forming a groove. The blade part 5a which protrudes to the side is provided. Thereby, it can use for the cutting process of an internal diameter screw | thread or another internal diameter groove | channel.
[0022]
As mentioned above, although embodiment of this invention was illustrated based on drawing, this invention is not limited to the said embodiment, It cannot be overemphasized that it can be set as arbitrary forms, unless it deviates from the objective of invention.
[0023]
【The invention's effect】
As described above, according to the present invention, the indexable insert of the present invention is a cutting insert which is provided integrally is protruded small-diameter rod portion along one side of the substrate sheet, the small rod-like portion includes a cutting edge for the end face grooving is formed on the tip end of the small diameter rod portion, a breaker groove formed on the upper surface side of the substrate sheet with a continuous to said cutting edge, the switching An end face grooving portion having a side flank formed on the side surface sandwiching the blade ridge, a flat surface connecting the end face grooving portion and the flat plate-like base portion and the breaker groove, and the flat surface An intermediate portion having a curved raised surface that increases toward the thickness of the flat plate-like base portion, and the flat plate of the small-diameter rod-shaped portion in the portion of the intermediate portion where the flat surface and the curved raised surface are formed side opposite to the side surface along the Jo base, Since it has a concave portion curved to the side, or to be bolted to the holder, or can be firmly secured with a clamping piece or the like.
[0024]
Further, in the inner diameter machining tool using this tip, the small-diameter rod-shaped portion provided with the cutting edge ridge protrudes forward from the holder, and the machining portion is disposed along the side surface of the holder, so that the end surface of the holder is obstructive. Therefore, the chips can be smoothly discharged out of the hole.
[0025]
Further, since the side wall portion of the small-diameter bar-shaped portion has a curved concave shape, the mechanical strength of the small-diameter bar-shaped portion can be dramatically improved. Further, by providing a blade portion protruding laterally for forming a groove at the tip portion of the small-diameter rod-like portion, it can be used for cutting an inner diameter screw or other inner diameter grooves.
[Brief description of the drawings]
1A and 1B are views showing an embodiment of a throw-away tip according to the present invention, in which FIG. 1A is a plan view, FIG. 1B is a view taken along an arrow X in FIG. 1A, and FIG. FIG. 8D is a main part enlarged cross-sectional view.
2A and 2B are views showing a state in which the throw-away tip according to the present invention is attached to a holder, wherein FIG. 2A is a plan view and FIG. 2B is a side view.
FIG. 3 is a view showing another usage pattern of the throw-away tip according to the present invention.
4A and 4B are diagrams showing a relationship between a throw-away tip according to the present invention and a work material, wherein FIG. 4A shows a conventional example, and FIG. 4B shows a product of the present invention.
FIG. 5 is a view showing a conventional throw-away type inner diameter machining tool.
FIG. 6 is a view showing a conventional brazing type inner diameter machining tool.
FIG. 7 is a view showing a conventional integrated inner diameter machining tool.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Throw away tip 3 Flat base 4 Bolt hole 5 Cutting edge 6 Rake face 7 Small diameter rod-shaped part 7b Side wall part

Claims (1)

A throw-away tip provided integrally with a small-diameter bar-shaped portion protruding along one side surface of the flat plate-shaped base portion ,
The small diameter rod portion includes a cutting edge for the end face grooving is formed on the tip end of the small diameter rod portion, a breaker groove formed on the upper surface side of the substrate sheet with a continuous to said cutting edge, An end face grooving portion having a side flank formed on the side surface sandwiching the cutting edge ridge in a slope shape;
The end face grooving portion and the flat base portion are connected, and a flat surface following the breaker groove, and an intermediate portion having a curved raised surface that increases from the flat surface toward the thickness of the flat base portion,
Of the intermediate portion, the side surface facing the side surface along the flat plate-like base portion of the small-diameter bar-shaped portion in the portion where the flat surface and the curved raised surface are formed has a concave portion curved inward. Throw away tip.

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