JPH04118910U - Cutting tools - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention relates to a cutting tool used, for example, in turning, boring, etc., which performs rough machining and finishing at the same time. [Structure] In a cutting tool equipped with a rough cutting blade at the front and a finishing cutting blade at the rear along the cutting direction, the rough cutting blade has a plurality of cutting blades having the same shape and the same depth of cut. along the cutting direction. In other words, this is an improvement over the fact that rough cutting blades with large machining allowances are prone to chipping and require frequent tool replacement.
Even if chipping occurs in the leading cutting edge, cutting can be continued with the trailing cutting edge, improving the operating rate of processing equipment.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to cutting tools used for cutting processes such as turning and boring. It also relates to cutting tools that perform rough machining and finishing machining at the same time.

0002

[Conventional technology]

Conventionally, when turning a hole in a workpiece, for example, a tool was equipped with a rough cutting blade and a finishing cutting blade. It is known that rough machining and finishing machining can be performed at the same time using a cutting tool that has been developed. . As such a tool, for example, a medium-sized tool such as that disclosed in Utility Model Application No. 63-131310 There is a boring arbor for drilling.

0003

[Problem that the idea aims to solve]

In such a cutting tool, a rough cutting blade is provided on the front side in the cutting direction, and a rough cutting blade is provided on the rear side. A finishing cutting blade is provided, and the rough cutting blade is initially used to perform rough cutting and this is then used for finishing. Although finishing is done with a cutting blade for rough use, there is a large amount of machining allowance with a rough cutting blade, so the same method is used. The blade is prone to chipping, and the blade must be replaced frequently. There was a problem. In other words, in this case, the cutting blade is made of ultra-high pressure fuel with excellent wear resistance. Sintered bodies, such as CBN (cubic boron nitride fine powder sintered at high temperature and high pressure) is often used, but such CBN is used as a cutting blade for rough machining with a large machining allowance. If used as a Like a boring tool, a pair of rough cutting blades and finishing cutting blades come together as a set. If multiple sets are installed on the bar, even one cutting edge may be damaged. If a problem occurs, the entire product becomes defective, so it is necessary to replace it frequently. It is said that the operating rate is significantly reduced due to the interruption of machining required for cutting tools etc. There was a problem. Therefore, there was a need for a method to reduce the frequency of tool replacement and increase the operating rate.

0004

[Means to solve the problem] In order to solve this problem, the present invention is a cutting machine equipped with a rough cutting blade and a finishing cutting blade. In the tool, the rough cutting blade has a plurality of holes having the same shape and the same depth of cut. A cutting edge is provided.

[0005]

[Effect]

By arranging multiple cutting edges of the same shape in parallel along the machining feed direction, the preceding cutting Even if chipping occurs on the blade, the cutting edge behind it can continue cutting. Cutting tool replacement frequency is reduced.

[0006]

【Example】

Embodiments of the cutting tool of the present invention will be described based on the attached drawings. Figure 1 is the first embodiment of the cutting tool of the present invention, and Figure 2 is an enlarged view of the rough cutting blade (A). is a front view, FIG. 3B is a side view, and FIG. 3 is an enlarged view of section A in FIG. 2A. The first embodiment of the cutting tool of the present invention is a shaft material machined by lathe processing as shown in Fig. 1. After rough cutting the outer periphery of the workpiece (W) that rotates around the axis, It is equipped with two types of bites for subsequent finishing machining. In other words, the arrow in the figure On the front side of the holder 2 of the cutting tool 1 that is sent in the direction, a rough cutting tool 3 is secured with a bolt 4. A finishing cutting tool 5 is fixed to the rear side with bolts 4. this house The rough cutting tool 3 is configured as a brazing tool, for example, as shown in FIG. 2(B). It is equipped with a carbide 7 brazed to the tip of the main body 6 and an ultra-high pressure combustion body 8 at the tip of the carbide 7. It is growing.

[0007] On the other hand, as shown in FIG. 3, which is an enlarged view of part A in FIG. The first cutting edge portion 10 and the second cutting edge portion 11 having the same shape as the first cutting edge portion 10 are arranged in the machining feed direction. They are continuously provided along the steps 12 via the stepped portions 12. In other words, the conventional shape is The shape of the single cutting edge 51 as shown in the figure is changed to multiple cutting edges. be. The shapes of the first cutting edge part 10 and the second cutting edge part 11 are the same, and the cutting depth is The length (amount of forward protrusion) is also the same. Therefore, even if chipping occurs in the preceding cutting edge 10, the second cutting edge 11 of the same shape Therefore, machining can be continued, and the replacement life of the cutting tool can be extended. Of course this The number of cutting edges is not limited to two as in the embodiment.

[0008] Next, FIG. 4 shows a second embodiment showing the application to hole machining using a boring tool. So Of the rough cutting cutting blade 22 and the finishing cutting blade 23 provided on the boring tool 21, , the structure of the rough cutting cutting blade 22 is similar to that shown in FIGS. 2 and 3.

[0009] Next, FIG. 5 shows a third embodiment, in which one workpiece is processed by line boring. This shows an example of application to a tool that performs multiple turning operations on (W) at the same time. It is. In this case, the boring arbor 31 corresponds to one hole of the workpiece (W). Therefore, the cutting blade 32 for rough cutting and the cutting blade 33 for finishing cutting are paired as one set, and in actual use. In the case of the example, five sets of cutting blades 32 and 33 are provided for five holes. . Then, one end side of this boring arbor 31 is gripped with a collet chuck 34. Rotate the boring arbor 31 in the direction of the arrow while supporting the other end with the guide member 35. send it to be processed. The cutting tool of the present invention can be applied to such types of cutting tools. In particular, increasing practical value through As stated in the section ``. In other words, in such boring machining, a breakage occurs on the cutting edge at one location and the machining process is difficult. If it becomes defective, it may be difficult to take measures such as re-sharpening it from the perspective of maintaining the accuracy of other holes. Therefore, it is necessary to increase the frequency of tool replacement to avoid wasting the entire product. Because there was. In this respect, the cutting tool of the present invention is particularly suitable for rough cutting blades that are prone to chipping. Multiple cutting edges of the same shape extend the tool life and reduce the frequency of replacement. I can do that. In other words, the operating rate can be increased.

0010

[Effect of the idea]

As described above, the cutting tool of the present invention has multiple same-shaped cutting blades for roughing with a large machining allowance. A shaped cutting edge is provided to reduce the frequency of tool replacement due to chipping. This can improve the operating rate of processing equipment. Also, there are fewer processing defects on the workpiece. This has the effect of increasing productivity.

[Brief explanation of drawings]

[Fig. 1] First embodiment of the cutting tool of the present invention

[Figure 2] An enlarged view of the rough cutting blade; (A) is the front view;
(B) The figure is a side view.

[Figure 3] Enlarged view of part A in Figure 2 (A)

[Fig. 4] Explanatory diagram showing a second embodiment of the present invention

[Fig. 5] Explanatory diagram showing the third embodiment of the present invention

[Figure 6] Enlarged view of the cutting edge of a conventional cutting blade

[Explanation of symbols]

(1) Cutting tool (3) Rough cutting tool (5) Finish cutting tool (10) First cutting edge (11) Second cutting edge (21) Boring tool (22) Rough cutting tool ( 23) Cutting blade for finishing cutting (31) Boring arbor (32) Cutting blade for rough cutting (33) Cutting blade for finishing cutting

Claims (1)

[Scope of utility model registration request] 1. A cutting tool comprising a rough cutting blade at the front and a finishing cutting blade at the rear in the processing feed direction, wherein the rough cutting blade has a plurality of cutting blades having the same shape and the same depth of cut. A cutting tool characterized by having a part.