JPS6186117A - Multi-blade cartridge type milling cutter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a milling machine, and more particularly, a plurality of protrusions are formed radially at equal intervals on the outer circumference of a disc-shaped cutter body, and a plurality of protrusions are formed on the protrusions in a radial manner. A multi-blade car 1- configured to fit and fix a cartridge having a blade.
Regarding ridge type milling cutter.

BACKGROUND OF THE INVENTION Many milling machines, ie, milling machines, are used that rotate a circular cutter fitted on a shaft and feed the workpiece at a predetermined speed to cut the workpiece.

In the prior art, milling cutters that achieve the cutting function of milling machines can be divided into 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. It is possible. Therefore, the former has the disadvantage that if there are a large number of workpieces to be cut, the cutting edge will wear out, and if only the cutting edge needs to be replaced, the milling metal body 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, as disclosed in U.S. Pat. No. 3.701.187 in relation to the latter, a tip corresponding to the cutting edge of a milling cutter is detachably attached, so that when the tip is worn out, However, a method is conceivable in which only the chip part is replaced. However, with this technology,
There is a limit to the number of chips that can be fixed to one milling cutter, and there is a problem in that the installation requires an extremely large amount of space. Therefore, the number of tips that can be attached to one milling cutter body does not increase significantly, and even if you try to change the tips depending on the type of workpiece, the tips are fixed to the milling cutter one by one through bolts, etc. It would be extremely complicated to replace them one by one, and it would not actually meet the requirements of factories, etc.

Therefore, as a result of various studies and efforts, the present inventors formed a plurality of protrusions radially and at equal intervals on the peripheral edge of the milling cutter body. Prepare a car I ridge with several blades, fit this carton so as to press it against the text part, and attach it to the cutter body removably using a bolt, etc.
It is extremely easy to position the cartridge when replacing it, and the cartridge 1-ridge can be firmly fixed.
Furthermore, it has been found that the type of cutting blade can be changed easily to accommodate two types of workpieces, and even if the cutting blade becomes worn or broken, it can be easily repaired by replacing only the cartridge, eliminating the above-mentioned inconveniences. Ta.

Therefore, the purpose of the present invention is to provide easy handling, excellent cutting efficiency, and lead to precision cutting. - In addition, the cartridge having a cutting edge can be easily positioned, and the cartridge itself can be firmly fixed. To provide a milling cutter capable of replacing a car/torinoge when a blade part needs to be replaced.

In order to achieve the above object, the present invention forms a circumferential step on the outer periphery of a cutter body constituting a milling machine, and further forms a plurality of radially extending protrusions at equal intervals on the step. and a cartridge having a plurality of cutting blades and a surface corresponding to the radial protrusion is removably fitted into a space defined by the protrusion and the side wall of the stepped portion for positioning. It is characterized by being configured to do so.

Next, preferred embodiments of the milling cutter according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a cutter body, and a large diameter hole 12 is formed in the center of the cutter body 10. The end of a rotating shaft extending from the milling machine body fits into the hole 12, as will be described later. Holes 14a to 14d extending in the axial direction of the force/7 turbo day 10 are bored at a predetermined interval in the center of the cutter body 10 formed into a ring shape by forming the hole 12 in this manner. be done. Further, the cutter body 10
A circumferential step 16 is formed on the outer periphery

Substantially, this step 16 has continuous side walls 16a of equal length, each of which is provided with a pair of bolt holes 18a, 18b in the radial direction of 1° of the cutter body. Ru. Note that a flat protrusion 2o extending in the radial direction from the joint portion of the side wall 16a and having a slightly shorter depth than the step portion 16 is provided.

Therefore, it will be easily understood that the protrusion 20 has substantially parallel side walls 22a and 22b.

The cutter body 10 cartridge 24 configured as described above is installed. The structure of this cartridge 24 is shown in FIGS. 3 to 5. The cartridge 24 is composed of a main body portion 24a and a blade portion 24b.
has cutting edges 26a formed at equal intervals on its top. In other words, is there any escape between the adjacent cutting edges 26a? #Chicken 6
b is engraved. On the other hand, there are holes 2 in the side wall of the main body 24a.
8a and 28b are drilled at a slight inclination. In this case, the main body portion 24a has a stepped groove 30 extending to the blade portion 24b.
a, 30b are engraved. The stepped grooves 30a and 30b are in contact with the side walls 22a and 22b of the protrusion 20, respectively, and therefore each has a side surface radial with respect to the center of the cutter body 10. The outer surface portion of the cartridge 24 is formed as an arc-shaped side surface 32a, while the inner surface portion of the cartridge 24 is formed as a planar side surface 32b (see FIG. 5). Side 3 of this cartridge 24
2b abuts against the side wall 16a of the cutter body 10.

The cartridge 24 configured as described above has a bolt 34.
It is attached to the stepped portion 16 of the cutter body 10 via. That is, the step grooves 3 of the cartridge 24 are formed on the side walls 22a and 22b formed on the protrusion 20 of the cutter body 10.
0a and 30b, and with the side surface 32b of the cartridge 24 in contact with the side wall 16a of the stepped portion 16, the bolt 34 is passed through the holes 28a and 28b, respectively, and the bolt insertion hole 18a of the cartridge 10 is inserted. 18b
Attach the cartridge 24 by screwing it into the housing. As a result, the stages 'tp30a, 30b of the cartridge 24
are substantially widened from each other, so that the side walls 22a
, 22b, and further, its side surface 32b is pressed against the side wall 1
6a, the cartridge 21) can be firmly fixed to the cutter body 10.

Therefore, as mentioned above, +1. Constituent cutter body 1
0 is coupled to a spindle 38 that is directly connected to a rotational drive source.

That is, the bolts 36 are passed through the holes 14a to 14d drilled in the cutter body 10, and then returned to the holes drilled in the spacer 40. On the other hand, spacer 4
0 is fixed to a flange 42 formed on the spindle 38 via bolts (not shown), making it possible to connect the cutter body 10 and the spindle 38.

The multi-blade cartridge and jig-type milling cutter according to the present invention is constructed as described above, and its functions and effects will be explained next.

First, when the spindle 38 is rotated at high speed by a rotational drive source (not shown), the spacer 40, which is integral with the spindle 38,
The flange 42 also rotates, and the spacer 4 is attached to this flange 42.
The cutter body 1O, which is fixed via 0, also rotates. At this time, since the cartridge 24 attached to the cutter body 10 has a very large number of blades arranged in series at equal intervals, excellent cutting force and continuous cutting are possible.

At this time, the stress due to the cutting resistance generated on the cutting edge 26a is sufficiently supported by the protrusion 20, so that the cartridge 10
Accidents such as devolatilization will not occur.

In this case, will the cutting debris generated by the cutting blade 26a in contact with the workpiece (not shown) escape? 126b to the outside. Note that if cutting oil is supplied from the hole 12 of the cutter body IO, this cutting oil will suitably serve to lead out the cutting waste to the outside.

By the way, the workpiece is cut as described above under normal conditions, but if the cutting edge is worn or broken, or when changing to a cutting edge that corresponds to the type of workpiece, the desired It is possible to replace the cartridge with one that has a cutting edge. That is, by loosening the bolt 34 that fixes the cartridge 24,
is removed, and a cartridge having a desired cutting edge is installed using the bolt 34. As a result, the new cutting edge can face the workpiece, keeping the cutting ability constant.
Another advantage is that repairs can be easily performed.

Next, another embodiment of the present invention is shown in FIGS. 10a to 10d.

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 step portions 16 of the cutter body 10. As can be understood from the figure, the cartridge 50 consists of a main body part 50a and a blade part 50b, and the cutting edge constituting the blade part 50b is brazed to the main body part 50a. In the case of a snake, the chip pocket 52 of the blade portion 50b is formed by a curved recess, so that the cut surface 54 is exposed in the main body portion 50a. In this embodiment, since the chip pocket 52 is greatly curved and hollowed out, cutting waste is preferably led out to the outside.

Next, a cartridge 60 disclosed in FIG. 10C is screwed onto the cutter body 10 in the same way as in the previous embodiment, but the main body part 60a is formed particularly large, and the blade is attached to the main body part 60a. A plurality of portions 60b are each tightly secured with 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 embodiment of the cartridge 50 shown in FIG. That is, in this cartridge 70, the blade portion 70b is brazed to the main body portion 70a, and the blade portion 7Ob itself is formed relatively smaller than the main body portion 70a. For this reason, the chip pocket 72 is also slightly thicker, and the overall technical effect is that the blade portion 70b can be manufactured at a lower cost and is more robust.

As described above, according to the present invention, cartridge replacement is extremely easy.

It is possible to firmly fix the blade to the cutter body, and it is also possible to change the blade to match the type of workpiece,
If the cutting blade becomes worn or broken and needs to be replaced, this can be easily done by replacing the cartridge. Moreover, since the number of blades provided in the cartridge is extremely large, it is possible to perform cutting as efficiently as possible, similar to that of a grindstone, and it is possible to obtain excellent cutting efficiency.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that various improvements and design changes can be made without departing from the gist of the present invention. It is.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a cutter body constituting a multi-blade cartridge type milling cutter according to the present invention, FIG. 2 is a partially sectional side view of the cutter body, FIG. 3 is a front view of the cartridge, and FIG. Figure 3 is a cross-sectional view taken along line IV-rV, Figure 5 is a bottom view of the cartridge, Figure 6 is a two-part assembly diagram of the cutter body and cartridge, and Figure 7 is a partially omitted plan view of the cartridge installed in the cartridge body. Figure 8 is a sectional view taken along the line ■-■ in Figure 7, Figure 9 is a partially omitted front view of the cartridge and cutter body shown in Figure 7, and Figure 10a is a different cartridge installed in the cutter body. FIGS. 10 to 10d are front views of the cartridge assembled into the cutter body. 10... Cutter body 12... Hole □14
a to 14d...holes 16...steps 18a, 18b
... Hole 20 ... Projections 22a, 22b ... Side wall
24... Cartridge 26a... Cutting blade
26b...Groove 28a, 28b/One hole 30a13
0b...Step groove 32a, 32b...Surface 34.36
...Bolt 38...Spindle 40...Spacer 42...Flange 50...Cartridge 5
2. Chip pocket 60. Car 1-IJ nozzle 6
2.Screw 70.Cartridge 72.
・Chinobu Pokenoto' 30a Fig, 7 ■- Fig, 9

Claims (2)

[Claims] (1) A circumferential stepped portion is formed on the outer periphery of a cutter body constituting a milling machine, and a plurality of radially extending protrusions are formed at equal intervals on the stepped portion, and the protruded portion and the stepped portion are formed at equal intervals. A cartridge having a plurality of cutting blades and a surface corresponding to the radial protrusion is removably fitted and positioned in a space defined by the side wall of the cartridge. Multi-blade cartridge type milling cutter. (2) In the milling cutter according to claim 1, the cartridge is a multi-blade cartridge type in which the cartridge has stepped grooves at both ends thereof, and the cartridge is positioned by engaging the stepped grooves with the protrusions. milling cutter.