JPH052241Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a throw-away tip for grooving for grooving and turning, and in particular, it relates to a chip disposal technique when performing lateral cutting. It is.

[Prior Art] Conventionally, as shown in FIGS. 6 and 7, this type of throw-away chip has been provided with rake faces 2, 2 having cutting edges 2a formed on the upper surface of both ends of the chip body 1. At the center of the width direction of these rake faces 2, 2, the depth becomes gradually deeper from the tip side and the rear end side toward the center, and the dimension in the width direction increases from the bottom to the top. A throw-away tip for grooving in which recesses 3, 3 are formed is known.

This throw-away tip for grooving is attached to a tool body (not shown) and used for grooving and turning, and is used to remove chips generated by a cutting edge 2a from a recess 3 provided on a rake face 2. By applying the blade to the bottom of the blade, the blade is curled to make it easier to dispose of the chips.

[Problems to be solved by the invention] By the way, when machining a groove wider than the width using the throw-away tip for grooving having the above structure, it is necessary to machine the groove to a certain depth, and then use the throw-away tip for grooving. Send the chip in the axial direction of the lathe to widen the groove. In this case, since the throw-away tip for grooving has low rigidity with respect to load force from the lateral direction, the feed rate is normally set to a small value, resulting in thin and flexible chips. However, such chips
It reaches the bottom of the recess and extends straight without curling, making its shape and flow direction irregular and unstable. For this reason, there is a problem in that the chips interfere with the workpiece and the tool, which not only deteriorates the machining accuracy of the workpiece, but also poses a danger to the operator.

This invention was developed to solve the above-mentioned problems, and it is possible to curl the chips and restrict the flow direction when widening the groove, thereby improving the machining accuracy of the workpiece. The object of the present invention is to provide a throw-away tip for grooving that not only improves the cutting performance but also allows cutting operations to be carried out smoothly and safely.

[Means for solving the problem] The throw-away tip for grooving of this invention has the following features:
A groove portion is formed in an intermediate portion between the side edge of the rake face and the recessed portion, the width dimension of which gradually increases and the depth gradually increases toward the rear end side.

[Function] Chips generated during the widening process of the groove hit the bottom surface of the groove and are bent. At this time, the distance that the generated chips take to reach the bottom of the groove is larger on the rear end side than on the leading end side, so the chips curl with a larger curvature on the rear end side than on the leading end side. The outflow direction is regulated by .

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a plan view showing a throw-away tip for grooving according to an embodiment. In FIG. 1, reference numeral 4 indicates the chip body. The chip body 4 is a bar-shaped member with upper and lower surfaces parallel to each other and a substantially pentagonal cross section, and a rake face 5 having a cutting edge 5a at the tip edge is formed at the tip of the upper surface. The rake face 5 is formed at its tip and is composed of an inclined face 5b that slopes downward toward the tip, and a flat face 5c parallel to the lower surface 4a of the chip body 4. A flat surface 5 is formed at the center of the rake surface 5 from the inclined surface 5b.
A concave portion 6 reaching c is formed. This recess 6
As shown in Figures 2 and 3, the depth gradually increases from the tip and rear ends toward the center, and as shown in Figure 3, the width direction increases from the bottom. It is configured to increase in size as it goes upward. A groove 7 is formed between the recess 6 and the side edge of the rake face 5. The groove portion 7 has a substantially arcuate cross-sectional shape, and is formed so that its widthwise dimension gradually increases and its depth gradually increases toward the rear end side.

Incidentally, since the rear end portion of the tip body is constructed in the same manner as the front end portion, the same components are given the same reference numerals and their explanations will be omitted.

In the throw-away tip for grooving having the above structure, when widening a groove, chips hit the bottom surface of the groove portion 7 located in the feed direction and are bent. At this time, the distance for the generated chips to reach the bottom of the groove portion 7 is greater on the rear end side than on the leading end side, so the chips curl with a larger curvature on the rear end side than on the leading end side. This restricts the direction of its outflow. Therefore,
Not only does it prevent chips from interfering with the tool or workpiece material, greatly improving machining accuracy, but it also allows for safe and smooth cutting work, and even better Chips can be easily disposed of.

In the above embodiment, the cross-sectional shape of the groove portion 7 is arcuate, but the shape is not limited to such a shape. If the dimensions gradually increase toward the rear end, it is V-shaped or U-shaped.
The shape such as the letter shape is arbitrary.

[Effect of the invention] As explained above, in the throw-away tip for grooving of this invention, the dimension in the width direction gradually increases toward the rear end in the intermediate part between the rake face, the side edge, and the recess. Since the groove portion is formed with a groove portion whose depth gradually increases, it is possible to curl the chips and restrict the flow direction of the chips. Therefore, the work material does not interfere with the tool or the work material, and not only can the machining accuracy be greatly improved, but also the cutting work can be performed safely and smoothly. Furthermore, the effect of facilitating the disposal of chips after cutting can be obtained.

[Brief explanation of the drawing]

1 to 5 are views showing one embodiment of the present invention, in which FIG. 1 is a plan view showing a throw-away tip for grooving, FIG. 2 is a view taken in the direction of the arrow in FIG. 3 is a directional view of FIG. 1, FIG. 4 is a sectional view taken along the - line in FIG. 1, FIG. 5 is a sectional view taken along the - line in FIG. 1, and FIGS. 6 and 7 are FIG. 6 is a side view of a conventional throw-away tip for grooving, and FIG. 7 is a view taken in the direction of the arrow in FIG. 6. 2... rake face, 2a... cutting edge, 3... recess,
5... Rake face, 5a... Cutting edge, 6... Concavity, 7
...Mizobe.

Claims (1)

[Scope of utility model registration request] A cutting edge is formed on the tip edge of the rake face, and a recess is formed in the widthwise center of the rake face, the depth of which gradually increases from the tip and rear ends toward the center. In the throw-away tip for grooving, a groove portion is formed at an intermediate portion between the side edge of the rake face and the recessed portion, the width direction dimension thereof gradually increasing and the depth gradually increasing toward the rear end side. A throw-away tip for grooving that is characterized by the ability to