JPS61131810A - Cutter body for milling cutter - Google Patents

Abstract

PURPOSE:To promote the blade multiplication of a milling cutter and to facilitate blade change by forming a ring groove on the outer peripheral edge section of a milling cutter body and by mounting a plurality of cartridge having two or more cutting edges on the plane side section of the step section. CONSTITUTION:A hole 12 of large diameter is formed at the central section of a cutter body 10. The spindle end extended from a milling machine body is fitted to the hole 12. Bolt holes 14a-14d are bored at the central section of the ring shaped cutter body 10. In addition, around the outer peripheral section of the cutter body 10, a groove 15 is formed, and the wall section extended in axial direction forms side wall section 16a-16o having same width and length as those of the mounting face of a cartridge 22 and bolt holes 18a and 18b. On these side wall section 16a-16o, cartridges 22 are arranged. A cartridge 22 is formed by a body 22a and a blade section 22b having a plurality of blade 22c and a clearance groove 22d.

Description

[Detailed Description of the Invention] The present invention relates to a cutter body constituting a milling machine,
More specifically, the present invention relates to a cutter body for removably mounting a power cartridge having a plurality of cutting edges.

2. Description of the Related Art Many milling machines, ie, milling machines, are used that rotate a circular cutter fitted on a shaft, feed the workpiece at a predetermined speed, and cut the workpiece with the cutter.

In the prior art, milling cutters that achieve the cutting function of milling machines can be divided into two types: those in which the milling cutter body and the blade are integrally formed, and those in which the milling cutter body and the blade are separated. Therefore, in the former,
If a large number of workpieces are to be cut, the cutting edge will wear out, and even if only the cutting edge needs to be replaced, the entire milling cutter must be replaced. Furthermore, if the type of workpiece is different, it goes without saying that the milling cutter itself must be replaced depending on the type of workpiece, and for this purpose, many types of milling cutters must be prepared depending on the type of workpiece. It's inconvenient.

On the other hand, regarding the latter, U.S. Patent No. 3,701,187
As disclosed in the above issue, a tip corresponding to the blade is removably attached to the cutting edge of a milling cutter, so even if the tip becomes worn out or the type of workpiece is different, only that tip can be replaced. One possible method is to do so.

However, this technique has the disadvantage that there is a limit to the number of chips that can be fixed to one milling cutter, and that the mounting space must be extremely large. Therefore, the number of inserts that can be attached to one milling cutter body does not increase significantly, and even if you try to change the inserts depending on the type of workpiece, the inserts that are fixed to the milling cutter one by one through bolts etc. It becomes extremely complicated to exchange words one by one,
In practice, this does not meet the requirements of factories, etc.

Therefore, as a result of intensive research in order to overcome the various problems mentioned above, we found that if a cartridge with multiple blades was prepared and the cartridge was configured to be installed in the milling cutter body without interruption, it would be possible to grind continuously and sharply. It has been found that a milling cutter capable of precision cutting can be obtained.

However, even when attaching a cartridge to a milling cutter body as described above, it is extremely difficult to easily and reliably attach a cartridge containing a large number of blades to an ordinary circular milling cutter body.

Therefore, as a result of further prototyping and ingenuity, the present inventor formed a stepped portion along the circumferential direction of a circular milling cutter, and fixed the cartridge to the flat side of this stepped portion via a bolt or the like. It has been found that by doing so, it is possible to easily and reliably mount a plurality of cartridges, and also to easily replace the blade in case of breakage, thereby eliminating the above-mentioned disadvantages.

Therefore, the purpose of the present invention is to further promote multi-blade design, to enable continuous cutting, to easily cope with blade changes due to wear or breakage, and to easily change blades to adapt to various workpieces. To provide a cutter body for a milling cutter, which can be replaced with another one, and in which the cartridge can be firmly mounted.

In order to achieve the above object, the present invention provides a cutter body for a milling cutter that constitutes a milling machine and is provided with a plurality of cartridges having two or more cutting blades, the cutter body having an annular groove on the outer peripheral edge thereof. , and the cartridge is configured to be mounted on the flat side of the stepped portion forming the annular groove.

Next, a preferred embodiment of the cutter body according to the present invention will be described in detail with reference to the accompanying drawings together with a cartridge attached thereto.

1 and 2, reference numeral 10 indicates a cutter body according to the present invention, and a large diameter hole 12 is formed in the central portion of the cutter body 10. In FIG. The end of a rotating shaft extending from the milling machine body fits into the hole 12, as will be described later.

By forming the holes 12 in this manner, bolt insertion holes 14a to 14d are formed at a predetermined interval in the center of the ring-shaped cutter body IO.

Furthermore, a circumferential groove 15 is formed along the circumferential direction on the outer circumference of the cutter body 10, and this circumferential groove 1
The wall portions extending in the axial direction defining the cartridge 5 are formed as side wall portions 16a to 160 having the same width and equal length as a mounting surface of a cartridge, which will be described later. In this case, a set of bolt insertion holes 18a and 18b are formed in each of the side walls 16a to 16o.

Therefore, the cutter body 10 configured as described above is
In the side wall portions 16a to 16o, cartridges 22 are disposed so as to cover the outer peripheral portion of the cutter body 10 without interruption. The structure of the cartridge 22 is shown in FIGS. 3 to 5. The cartridge 22 is composed of a main body portion 22a and a blade portion 22b, and in this case, the blade portion 22b has a plurality of cutting edges 22c and a quarter-edge relief groove 22d extending from the cutting edges 22c. Furthermore,
Holes 26a and 26b slightly inclined with respect to the radial direction of the cutter body 10 are bored in the main body portion 22a. On the other hand, as shown in FIG. 5, the cartridge 22 has an arcuate surface 28a on the outside, and a flat surface 28b on the inside.

Therefore, the bolts 3Qa and 30b are passed through the holes 26a and 26b of the cartridge 22 configured as described above,
The cartridge 22 is attached to the cutter body 10 because the tips of the holes 30a and 30b are screwed into the holes 18a and 18b of the cutter body 10. Here, since each of the side wall portions 16a to 16o of the cutter body 10 has a shape corresponding to the flat portion 28b of the cartridge 22, positioning of the cartridge 22 is easy, and furthermore, the cartridge 22 is placed in the circumferential groove 15. It becomes possible to arrange the arrangement without interruption. In this case, the blade portion 2
Cartridge 2 adjacent to cutting edge 22c formed on 2b
2, the cutting edge 22c achieves continuous cutting rather than intermittent cutting, making it possible to equalize the cutting force and avoid fluctuations in the load. This makes it possible to carry out even smoother grinding. In this case, as shown in FIG. 9, the spacing L1 between the cutting blades 22c, 22c of a single cartridge 22 is configured to be equal, and the spacing L2 between the cutting blades between adjacent cartridges 22 is also equal to L1. The lengths of the cartridge 22 and the side wall portions 16a to 160 may be selected as follows.

Therefore, the cutter body 1 configured as described above is
0 is secured to the spindle 34 by a bolt 32.

That is, the hole 14 provided in the cutter body lO
a to 14d, and the tip of the bolt 32 is attached to a flange 36 integral with the spindle 34.
into the bolt insertion hole 37. As a result, the cutter body 10 and the spindle 34 are integrated.

The cutter body according to the present invention is basically constructed as described above, and its functions and effects will be explained next.

First, when the spindle 34 is rotated at high speed by a rotary drive source (not shown), the flange 36 integral with the spindle 34 also rotates, and the cutter body IO fixed to the flange 36 via bolts 32 also rotates. Next, the eighth
When the workpiece 38 is moved in the direction of the arrow as shown in the figure,
The blade portion 22b, ie, the cutting blade 22c, of the cartridge 22 mounted on the cutter body 10 starts cutting the workpiece 38. Here, since the cutter body 10 has a very large number of blades arranged at equal intervals, continuous and rapid precision cutting is possible. In this case, the cartridge 22 is attached to the planar side wall portions 16a to 160. Therefore, when cutting the workpiece 38, no slipping occurs between the cartridge 22 and the cutter body 10 due to cutting resistance. In the end, this provides the effect that no load is applied to the bolts 30a130b. Note that the cutting waste generated by cutting is led out to the outside by the relief groove 22d.

By the way, when selecting a blade corresponding to the type of work or when changing to a new blade due to wear or breakage of the blade, the purpose can be achieved by replacing the cartridge. That is, the bolts 30a, 3
The blade part can be changed very easily by loosening the cartridge 0b, replacing the cartridge with a cartridge having the desired blade part, and then tightening the cartridges 30a and 30b again.

According to the present invention, as described above, it is possible to obtain a cutter body which has an extremely simple structure and yet allows a cartridge including a blade to be attached thereto, and as a result of disposing the cartridge without interruption, the cutting blade contained in the cutter body can be mounted. Since the number of blades is extremely large, it is possible to perform cutting similar to grinding, which is approximately equivalent to that of a whetstone. Furthermore, since it is possible to select the same cutting edge spacing between different cartridges, continuous cutting is performed rather than interrupted cutting, which doubles the precision of cutting and smooths the cutting plane. In addition, it is possible to easily respond to the selection of blades corresponding to various workpieces and to change the blade due to wear or breakage by replacing the cartridge.
Furthermore, the positioning of the blade becomes very easy,
Handling becomes easier. In addition, the cartridge can be firmly attached, and by simplifying the shape of the cartridge, the manufacturing cost can be kept low even when multiple types of cartridges are required. .

Incidentally, in the above-mentioned embodiment, the main body and the blade of the cartridge are integrally constructed to ensure its rigidity and produce an effect suitable for continuous cutting. However, it is of course possible to obtain the same continuous cutting effect even if the main body portion and the blade portion of the cartridge are not necessarily integrated as in this embodiment but are constructed separately. Examples thereof are shown in FIGS. 10a to 10d. In this case, the same reference numerals as in the above embodiment indicate the same components.

That is, FIG. 10a shows a state in which the cartridge 50 shown in FIG. 10 is attached to the cutter body 10. In this case, the cartridge 50 is screwed onto each of the polygonal side walls 16a to 160 of the cutter body 10. As can be understood from the figure, the cartridge 50 is composed of a main body portion 50a and a blade portion 50b, and the cutting edge constituting the blade portion 50b is brazed to the main body portion 50a. Moreover, since the chip pocket 52 of the blade portion 50b is formed as a curved recess, the boundary surface 54 between the main body portion 50a and the blade portion 50b is thick (visible) in the main body portion 50a.

Therefore, in this embodiment, since the chip pocket 52 is configured to be greatly curved and gouged, the cutting area of the blade portion 50b is increased and the cutting ability is improved, and furthermore, this curved concave portion allows the cutting waste to be preferably removed to the outside. will be derived.

Next, a cartridge 60 shown in FIG. 10C is screwed onto the cutter body 10 in the same manner as in the previous embodiment.

In this embodiment, in particular, the main body portion 60a is formed large,
A plurality of blade portions 60b are each tightly secured to the main body portion 60a by screws 62. Therefore, even if the cutting blade 64 constituting the blade portion 60b is worn out or broken, repair is easy because only the cutting blade 64 can be replaced, and the cartridge as a whole does not need to be replaced, resulting in an economical solution. There are some advantages.

FIG. 10d shows a modified version of the cartridge 50 shown in FIG. That is, this cartridge 7
0, the blade portion 70b is brazed to the main body portion 70a, and the blade portion 70b itself is formed relatively smaller than the main body portion 70a.

Therefore, the chip pocket 72 is not too large, and the overall technical effect is that the blade portion 70b can be manufactured at low cost and is robust.

By the way, as mentioned above, the respective cartridges 50, 60 and 70 shown in FIG. cutter body 1
0 is firmly attached, and the cartridge 50.6
0 and 70 can be manufactured at low cost.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments (various improvements and design changes can be made without departing from the gist of the present invention). Of course.

[Brief explanation of drawings]

Fig. 1 is a plan view of a cutter body according to the present invention, Fig. 2 is a partial side view of the cutter body, Fig. 3 is a front view of the cartridge, and Fig. 4 is a cross section taken along the line IV-IV in Fig. 3. figure,
Figure 5 is a top view of the cartridge, Figure 6 is a partial assembly diagram of the cutter body and cartridge, Figure 7 is a partial plan view of the cartridge attached to the cutter body, and Figure 8 is a partial assembly diagram of the cutter body and cartridge.
The figures are a cross-sectional view taken along the line ■-■ of Fig. 7, Fig. 9 is a partial front view of Fig. 7, Fig. 10 a is a plan view when different cartridges are attached to the cutter body, and Figs. 10 to d is a front view of a cartridge incorporated into a cutter body. 10... Cutter body 12... Holes 14a-14d
...Insertion hole 15...Peripheral groove 16a to 16o...Side wall portions 18a, 18b...Bolt insertion hole 22...Cartridge 34...Spindle 36...
・Flange 37・・Bolt insertion hole 38・・Workpiece 50・・Cartridge 52・・Chip pocket 54・・Boundary surface 60・・Cartridge
62...Screw 64...Cutting blade 70...Cartridge 72...Chip pocket

Claims (3)

[Claims] (1) A cutter body of a milling cutter constituting a milling machine and having a plurality of cartridges each having two or more cutting edges, the cutter body having an annular groove formed on its outer peripheral edge, and a step forming the annular groove. A cutter body for a milling cutter, characterized in that a cartridge is attached to a flat side of the cutter body. (2) In the cutter body according to claim 1, a threaded groove is formed in a radial direction on the flat side of the stepped portion, and a bolt is screwed into the threaded groove so that the cartridge can be freely attached and detached. A cutter body for a milling cutter that consists of mounting. (3) A cutter body for a milling cutter according to claim 1 or 2, wherein the stepped portion is formed by connecting side wall portions with a length corresponding to the contact surface of the cartridge.