JPH0617804U - Throw-away tip - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a throw-away tip that has good sharpness and chip disposability and has a long life. [Structure] A narrow positive land that is connected to the main cutting edge and the sub cutting edge on the upper surface, an inclined surface having a larger rake angle than the positive land, and a step portion located on the lower surface side that is a seating surface with respect to the inclined surface. The surfaces were formed continuously and along the outer circumference of the upper surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention has a polygonal flat plate shape as a whole, has a sub-cutting edge at the tip of its corner, and forms a chip breaker groove along the main cutting edge and the sub-cutting edge provided on the entire outer peripheral edge. Regarding throwaway tip being touched.

[0002]

[Prior art]

 Conventionally, this type of slowway chip is disclosed in, for example, Japanese Patent Publication No. 46-20788 and Japanese Patent Publication No. 53-4270. In order to expand the chip disposal range, these are formed with recesses or protrusions in the chip breaker groove.

[0003]

[Problems to be solved by the device]

 However, in the case of the throw-away tip as described above, chips of aluminum and the like are not always satisfactory in terms of sharpness and chip disposability due to problems such as welding of the work material. For this reason, there is a demand for the development of a throw-away tip that has good sharpness and chip disposability and has a long life when cutting aluminum or mild steel. The present invention has been made in view of the above demands, and provides a throw-away tip which has good sharpness and chip disposability and has a long life.

[0004]

[Means for Solving the Problems]

 The invention as set forth in claim 1 has a polygonal flat plate shape as a whole, a main cutting edge is formed at an edge of an upper surface serving as a rake surface, a sub cutting edge is formed at a tip of a corner of the upper surface, and a front surface is provided with a front edge. In the throw-away chip where the chip breaker groove along the main cutting edge and the sub cutting edge is formed, a narrow positive land that is connected to the main cutting edge and the sub cutting edge and a larger positive land than this The throw-away tip is characterized in that an inclined surface having a rake angle and a step surface located on the lower surface side which is a seating surface from this inclined surface are formed continuously and along the outer periphery of the upper surface. It was taken as a solution. According to a second aspect of the present invention, the throw-away tip according to the first aspect is a means for solving the above-mentioned problems, characterized in that a recess is formed continuously on the step surface in the vicinity of the sub cutting edge.

[0005]

[Action]

 According to the throw-away tip of claim 1, the chip is caused to substantially contact the tip along the upper surface with the inclined surface having the large rake angle and the step surface slightly lower than the inclined surface and scraped. , Discharged from the cutting edge without delay. That is, since the chips are discharged along the inclined surface and the step surface, the length of the chips that are discharged and divided becomes appropriate, the discharge is continuous, and the sharpness is improved. is there. Moreover, the cutting resistance of chips generated by cutting decreases and the rise in cutting temperature also decreases. According to the throw-away tip of the second aspect, the chips on the main cutting edge are constrained by the recesses, and the interference between the main cutting edge and the chip located on the opposite side in the cutting direction during rolling is eliminated.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In the drawings, reference numeral 1 is a throw-away tip of this embodiment, 2 is a main cutting edge, 3 is a secondary cutting edge, 4 is a chip breaker groove, 5 is a positive land, 6 is an inclined surface, and 7 is a step portion continuing from the end of the inclined surface. The surface. The throw-away tip 1 is a quadrangular plate-shaped tip that is attached to a milling machine or the like and used for milling a light alloy member such as aluminum, and has a positive land 5 formed with a narrow width of 0.05 mm or less, An inclined surface 6 having a rake angle α of about 30 degrees and a step surface 7 inclined further downward from the end of the inclined surface 6 are continuously formed on the entire peripheral edge of the throw-away chip 1. There is. Further, as shown in FIG. 1, in the vicinity of each sub cutting edge 3 of the throw-away tip 1, a recess 8 is formed continuously with the step surface 7 and inclined further lower than the step surface 7.

As shown in FIGS. 1 and 2, the main cutting edge 2 has a positive land 5 formed with a width of 0.05 mm or less from the tip of the cutting edge and a positive land 5 with a width of 1.0 to 1.5 mm. The inclined surface 6 formed continuously and the step portion surface 7 formed so as to be slightly lower than the inclined surface 6 are formed continuously. The positive land 5 has a rake angle β of 5 to 10 degrees and facilitates formation of a molded breaker. The positive land 5 is formed over the entire circumference of the throw-away tip 1. The inclined surface 6 is formed in the range of 1.0 to 1.5 mm from the tip of the cutting edge in the main cutting edge 2 and 0.3 to 1.0 mm in the sub cutting edge 3 and has a rake angle larger than that of the positive land 5. Then, the chips generated by the cutting blade are discharged along the inclined surface 6 and the step surface 7. The step surface 7 has a shape that is further lowered in the lower surface direction than the inclined surface 6, and prevents abrasion due to contact between chips and chips. The step surface 7 of the main cutting edge 2 begins to drop in the lower surface direction from a position of 1.0 to 1.5 mm from the tip of the cutting edge in order to secure the edge strength. The step surface 7 of the sub-cutting blade 3 is designed to be effective from a position of 0.3 to 1.0 mm from the tip of the cutting blade in the downward direction in order to make an effect at the time of fine cutting of about 0.3 mm such as finish cutting. It is formed in a form that begins to fall. The recess 8 forms a chip breaker groove 4 in the portion of the main cutting edge 2 that is close to the sub cutting edge 3 and is continuous with the depression of the inclined surface 6 and the step surface 7. The recess 8 prevents interference between the main cutting edge 2 adjacent to the main cutting edge 2 used for cutting through the sub cutting edge 3 and chips generated in the main cutting edge 2 used for the cutting. To prevent. As shown in FIG. 4, since the throw-away tip 1 is not intended to divide chips in the inner part of the step surface 7, the breaker 9 on the upper surface in side view does not have a rising surface from the bottom surface.

The operation and effect of this embodiment will be described below. According to the throw-away tip of this embodiment, the chips produced by cutting the light alloy scrape the positive land 5 and the inclined surface 6, and then the inclined surface 6 having a larger rake angle than the positive land 5 and the inclined surface 6 Is also restrained by the step surface 7 which is somewhat lower. Further, in the vicinity of the sub cutting edge 3 of the throw-away tip 1, the chips generated in the sub cutting edge 3 and the main cutting edge 2 around the sub cutting edge 3 are separated from the main cutting edge 2 and the sub cutting edge 3. After rubbing each inclined surface 6 and proceeding directly to the recess 8 without passing through the step surface 7 and rubbing the recess 8 while being constrained, it goes upward along the edge of the recess 8 opposite to the cutting direction. Bid up. As a result, the chips generated on the auxiliary cutting edge 3 and the main cutting edge 2 around the auxiliary cutting edge 3 do not reach the main cutting edge 2 located rearward in the cutting direction.

Therefore, according to the throw-away tip 1 of the present embodiment, the following effects can be obtained in light alloy rolling. First, the sharpness is good. This is larger than the positive land 5 when the rake angle α of the inclined surface 6 is 10 to 30 degrees, and moreover, due to the formation of the step surface 7, chips scrape the inclined surface 6 and contact the step surface 7 to restrain it. It is because it is the form. Secondly, it has good cutting processability. This is because the width of the chip breaker groove 4 is sufficiently wide and the step surface 7 that is lower than the inclined surface 6 is formed continuously with the inclined surface 6, so that the curl radius of the chip is large. This is because the chips can be processed without difficulty. Thirdly, the cutting life is long. This is because, as a result of the formation of the step surface 7, the scraping of the chips on the inclined surface 6 is partially eliminated, and the rake angle α of the inclined surface 6 is large with respect to the positive land 5, and the cutting resistance is small. This is because the rise in temperature is reduced and the cutting of light alloy chips that have been cut can be prevented from welding to the indexable insert 1. In addition, the interference between the chips generated in the auxiliary cutting edge 3 and the main cutting edge 2 around the auxiliary cutting edge 3 and the main cutting edge 2 behind in the cutting direction is eliminated, and the damage of the main cutting edge 2 is reduced. It is a factor of extending the life.

[0010]

[Effect of device]

 As described above, the throw-away tip according to claim 1 has a polygonal flat plate shape as a whole, and the main cutting edge is formed at the upper end which is the rake face, and the sub cutting edge is formed at the tip of the corner. , A throw-away insert having a tip breaker groove along the ridge of the main cutting edge and a sub-cutting edge on the outer peripheral edge of the upper surface, and a narrow positive land and a larger positive land than the positive land on the entire peripheral edge. Since the inclined surface having a rake angle and the step surface located below the end of the inclined surface are formed continuously, the rake angle of the inclined surface is larger than that of the positive land. Moreover, because the step surface is formed, chips are rubbed against the inclined surface and the step surface and continuously discharged, resulting in good sharpness. In addition, the width of the chip breaker is sufficiently wide, and the step surface, which is lower than the inclined surface, is formed continuously with the inclined surface, which increases the curl radius of the chips and makes it easy to operate. Can process chips. Furthermore, as a result of the formation of the step surface, the scraping of the chips on the inclined surface is partially eliminated, and because the inclined surface of the inclined surface is larger than the positive land and the cutting resistance is small, the rise in cutting temperature is small. , Prevents welding of cut light alloy chips and prolongs the service life.

The throw-away tip according to claim 2 is characterized in that a recess is formed continuously on the step surface in the vicinity of the sub cutting edge, so that chips are compared with the main cutting edge used for cutting. This prevents interference with the main cutting edge located on the opposite side through the secondary cutting edge, and prolongs the life of the tip.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a view taken along the line AA of FIG.

FIG. 3 is a view taken along the line BB of FIG.

FIG. 4 is a side sectional view of a throw-away tip.

[Explanation of symbols]

 1 Throw-away tip 2 Main cutting edge 3 Secondary cutting edge 4 Chip breaker groove 5 Positive land 6 Sloping surface 7 Step surface 8 Recess

Claims (2)

[Scope of utility model registration request] 1. A polygonal flat plate as a whole, a main cutting edge is formed at an edge of an upper surface serving as a rake surface, a sub cutting edge is formed at a tip of a corner of the upper surface, and the main cutting edge is formed on the upper surface. In a throw-away tip in which a tip breaker groove along the edge of the secondary cutting edge is formed, a narrow positive land that is connected to the primary cutting edge and the secondary cutting edge on the upper surface, and an inclined surface having a larger rake angle than this positive land A throw-away tip characterized in that a step surface located on the lower surface side which is a seating surface from the inclined surface is formed continuously and along the outer circumference of the upper surface. 2. The throw-away tip according to claim 1, wherein a recess is formed continuously on the step surface in the vicinity of the sub cutting edge.