JP4156749B2 - Cutting chip manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a technique capable of manufacturing a cutting tip at a low cost.
[0002]
[Prior art]
A cutting tool structure in which a cutting tip having a higher hardness is attached to the tip of the tool steel and cutting is performed with this cutting tip is widely adopted. For example, the manufacturing method of the cutting tip is (1) -63717 gazette "Twist drill" and (2) Japanese Utility Model Laid-Open No. 3-117520 gazette "Drill".
[0003]
In the above (1), as shown in FIG. 5, a wedge-shaped ultrahigh-pressure sintered body chip 10 (reference numeral is diverted from the publication) is integrated with a cylindrical body portion 9. The starting material 8 of the cutting blade 4 is used. After such a starting material 8 is bonded to the tool body by a technique such as brazing, the shape of the blade is adjusted.
[0004]
The above (2) is characterized in that a pentagonal chip material indicated by an imaginary line is cut out from a disk surrounded by a ring of hard sintered body 2 with cemented carbide 3 as shown in FIG. It is a thing.
[0005]
[Problems to be solved by the invention]
In the above (1), it is difficult to manufacture the starting material 8, and the starting material 8 becomes expensive, increasing the cost of the cutting tip.
The above (2) is the cost of cutting tips because only one or several pentagonal tip materials can be cut out from a disc of cemented carbide 3 surrounded by a ring of hard sintered body 2 and the yield is poor. The effect of lowering cannot be expected.
Accordingly, an object of the present invention is to provide a manufacturing method capable of manufacturing an inexpensive cutting tip.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the first aspect of the present invention uses a high-hardness sintered body of CBN or diamond as a second layer, and the second layer is sandwiched between a first layer and a third layer made of a tool material such as cemented carbide. In a method of manufacturing a cutting tool attached with a cutting tip using the three-layer laminate,
Preparing the three-layer laminate;
Preparing a shank for attachment to the chip;
A first cutting step of cutting a columnar material having a rectangular cross section by cutting the first layer, the second layer, and the third layer in this order substantially perpendicularly to the upper surface of the first layer;
A second cutting step of cutting a chip semi-finished product including the second layer in the center by cutting from one cut surface of the columnar material toward the other cut surface;
A joining step of joining this semi-finished chip product to a separately prepared shank;
And finishing to obtain a chip formed surface rake on chip semifinished, cutting edge, flank, Ri Tona,
Oil holes are opened in the shank and chip semi-finished product in advance, and the chip semi-finished product is positioned with respect to the shank by passing pins through the two oil holes in the joining process, and joining is performed in this state. vinegar Rukoto and features.
[0007]
A three-layer laminate is cut (cut into a line), a large number of chip semi-finished products are cut out from the obtained columnar material, and these chip semi-finished products are finished into chips.
Since the yield is very good, the chip manufacturing cost can be greatly reduced.
Furthermore, since the pin is connected to the oil hole, the positioning accuracy of the chip can be increased.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a three-layer structure adopted in the present invention. The three-layer structure 10 is a high-hardness sintered body of CBN or diamond as a second layer 11, and this second layer 11 is made of a cemented carbide. A laminated body sandwiched between a first layer 12 and a third layer 13 made of a tool material such as For example, the thickness of the second layer 11 is about 1 mm, the thickness of the first layer 12 and the third layer 13 is about 5 mm, and the thickness of the three-layer structure 10 is about 11 mm.
[0009]
Note that CBN is an abbreviation of cubic boron nitride, that is, cubic boron nitride, and is an artificial abrasive widely used with diamond. CBN is suitable for cutting ferrous workpieces and diamond is suitable for cutting non-ferrous workpieces.
[0010]
An example of a method for producing the three-layer structure 10 will be described. First, 4 to 16 μm diamond grains or CBN grains are sintered while being pressurized isotropically by HIP (hot isostatic pressing). The second layer 11 is manufactured, and the WC powder is stacked on the upper and lower sides of the second layer 11 and sintered while being pressed with HIP to obtain the three-layer structure 10.
HIP can be replaced with HP (hot press) or CIP (cold isostatic press), and the manufacturing method is not particularly limited as long as it is a well-known sintering method.
[0011]
FIG. 2 is a plan view of the three-layer structure adopted in the present invention (a figure corresponding to the plan view of FIG. 1), and is along an imaginary line 15 (... indicates a plurality, the same applies hereinafter). In addition, by cutting the three-layer structure 10 perpendicularly or substantially perpendicularly to the upper surface of the first layer 12, a large number of columnar materials 20 are cut out. This is sometimes called a deadline.
As is apparent from the figure, the columnar materials 20 can be cut out with a very high yield (for example, a yield of 90%).
[0012]
FIG. 3 is a perspective view of the columnar material according to the present invention. The columnar material 20 is a long material having a rectangular cross section of a × b, and is a laminate of the first layer 12, the second layer 11, and the third layer 13. is there. Among the opposing cut surfaces of the columnar material 20, the right one in the figure is called one cut surface 21 and the left one is called the other cut surface 22. For convenience, the columnar material 20 is tilted as indicated by an arrow c, and one cut surface 21 faces upward.
[0013]
FIG. 4 is a view of a columnar material having oil holes according to the present invention, in which oil holes 24 are formed in the second layer 11 of the columnar material 20 at a predetermined pitch. Specifically, drilling is performed from one cut surface 21 to the other cut surface, that is, from the front to the back of the drawing by an electric discharge machining method using a pipe electrode.
[0014]
FIG. 5 is a drawing of a chip semi-finished product according to the present invention, and the columnar material 20 having oil holes 24... Is cut from one cut surface 21 to the other cut surface, that is, from the front to the back of the drawing. As a result, a large number of chip semi-finished products 30 are cut out. Specifically, it cuts out by a wire cut electric discharge machining method.
[0015]
FIG. 6 is a front view of the chip of the present invention, and the chip semifinished product 30 cut out in FIG. 5 is finished to form rake surfaces 41, 41, cutting edges 42, 42, flank surfaces 43, 43, and the like. As apparent from the figure, the cutting edges 42 and 42 are formed in the hardest second layer 11. The finished product is the chip 40.
[0016]
FIG. 7 is a schematic diagram when a chip according to the present invention is attached to a shank. The chip 40 of the present invention can be used for various uses. An oil hole 51 is opened, a round bar is finished to a predetermined outer diameter, and a tip 40 is attached to the tip of the shank 50 having grooves 52 and 52, and preferably a pin 54 is connected to the oil holes 24 and 51. If the tip 40 is filtered with the filter material 55 on the shank 50 so as to increase the positioning accuracy of the tip 40, a cutting tool can be obtained.
[0017]
As is clear from the above description, the cutting chip manufacturing method of the present invention is directed to the three-layer laminate 10 of FIG. 1, and the first layer 12 and the second layer 11 are substantially perpendicular to the upper surface of the first layer 12. The first cutting step of cutting the columnar material 20 having a rectangular cross section shown in FIG. 3 by cutting in the order of the third layer 13;
A second semi-finished chip 30 (see FIG. 5) that includes the second layer 11 at the center is cut by cutting the columnar material 20 from one cut surface 21 toward the other cut surface 22. Cutting process;
The chip semi-finished product 30... Includes a finishing step shown in FIG. 6 to form a rake face 41, a cutting edge 42, and a flank face 43 to obtain a chip 40.
[0018]
By adopting this manufacturing method, as apparent from FIGS. 2 and 5, the product yield becomes extremely high, and a large number of chips can be manufactured at low cost.
[0019]
8A to 8D are manufacturing explanatory views according to a reference example of the present invention .
In (a), the three-layer laminate 10 is cut.
(B) shows the obtained columnar material 20. For convenience, the columnar material 20 is tilted as indicated by an arrow d.
In (c), the chip semi-finished product 30 including the second layer 11 in the center is cut by cutting from one cut surface 21 to the other cut surface 22 by a wire cut electric discharge machining method.
In (d), the chip semi-finished product 30 is finished to obtain the chip 40.
[0020]
FIG. 9 is a schematic diagram when a chip according to a reference example of the present invention is attached to a shank. An M groove 56 is notched in a plate-like shank 50, and the chip 40 is attached to the M groove 56. A cutting tool is obtained by joining the two together.
FIG. 10 is a view showing an example of use of a cutting tool provided with a tip manufactured in a reference example according to the present invention , and shows a state when the shaft 61 is cut out by the cutting tool 60.
[0021]
Although the columnar material 20 is tilted in FIGS. 3 and 8B, the columnar material 20 may be cut from the side to the other cut surface 22 from one side without being tilted. Therefore, the processing posture is arbitrary.
[0022]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
Claim 1 cuts the three-layer laminate, cuts out a large number of chip semi-finished products from the obtained columnar material, and finishes these chip semi-finished products into chips, so the yield is extremely improved, Chip manufacturing costs can be greatly reduced.
[Brief description of the drawings]
1 is a cross-sectional view of a three-layer structure employed in the present invention. FIG. 2 is a plan view of a three-layer structure employed in the present invention. FIG. 3 is a perspective view of a columnar material according to the present invention. Fig. 5 is a diagram of a columnar material having oil holes according to the invention. Fig. 5 is a cut-out diagram of a chip semi-finished product according to the invention. Fig. 6 is a front view of the tip of the invention. [Fig. 8] Manufacturing explanatory diagram according to the reference example of the present invention . [Fig. 9] Schematic diagram when attaching the chip according to the reference example of the present invention to the shank. [Fig. 10] The chip manufactured in the reference example according to the present invention. Of the use of cutting tools equipped with
DESCRIPTION OF SYMBOLS 10 ... 3 layer structure, 11 ... 2nd layer, 12 ... 1st layer, 13 ... 3rd layer, 20 ... Columnar material, 21 ... One cut surface, 22 ... Other cut surface, 30 ... Chip semi-finished product 40 ... chip, 41 ... rake face, 42 ... cutting edge, 43 ... flank.

Claims (1)

A cutting tip using a three-layer laminate in which a high-hardness sintered body of CBN or diamond is used as a second layer, and the second layer is sandwiched between a first layer and a third layer made of a tool material such as cemented carbide. In a method of manufacturing an attached cutting tool ,
Preparing the three-layer laminate;
Preparing a shank for attachment to the chip;
A first cutting step of cutting a columnar material having a rectangular cross section by cutting the first layer, the second layer, and the third layer in this order substantially perpendicularly to the upper surface of the first layer;
A second cutting step of cutting a chip semi-finished product including the second layer in the center by cutting from one cut surface of the columnar material toward the other cut surface;
A joining step of joining this semi-finished chip product to a separately prepared shank;
And finishing to obtain a chip formed surface rake on chip semifinished, cutting edge, flank, Ri Tona,
Oil holes are opened in the shank and chip semi-finished product in advance, and the chip semi-finished product is positioned with respect to the shank by passing pins through the two oil holes in the joining process, and joining is performed in this state. method for producing a cutting tool, wherein to Rukoto.

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