JPS6186119A - Multicutter blade cartridge type milling cutter - Google Patents

Abstract

PURPOSE:To increase the number of cutter glades and to simplify handling, by a method wherein a cartridge is mounted to the outer peripheral edge of a cutter body, and a number of standardized blades parts are secured in a closely-arranged manner to the cartridge by means of tightening means. CONSTITUTION:A large hole is formed in the central part of a cartridge body 10, and the end of a rotary shaft, extended from a milling machine body, is engaged with the hole. A projection 18 is formed on the outer peripheral edge of the cutter body 10, and plural step parts 22 are formed in the outer surface in the direction of radius of the projection 18. Cartridges 24 are mounted to the step part 22 without a break. A square tip 36 is secured to the cartridge 24. The square tip 36 comprises a relatively thin tip 36a, located to the one outer side part, and tips 36b, 36c, and 36d, connected to each for lamination. The square tips 36 are brought into contact with each other for positioning, and are secured to the cartridge 24 by means of bolts 40. In which case, face parts 28a and 28b of the cartridge 24 are brought into contact with adjoining face parts 28b and 28a for firmly-securing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a milling machine, and more particularly to a multi-blade cartridge type milling cutter in which a cartridge with a number of consecutive blades is detachably attached to a canter body, and the cartridges themselves are joined to each other. .

There are many milling machines in use that rotate a circular cutter fitted on a shaft, feed the workpiece at a predetermined speed, and use the cutter to cut a crocodile.

In the prior art, the milling cutter that achieves the cutting function of this milling machine can be divided into two types: one in which the milling cutter body and the blade are integrally formed, and the other in which the milling cutter body and the blade are separated. It is possible. Therefore, in the former case, if there are a large number of workpieces 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 must be replaced in response to the 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 No. 1, a tip corresponding to the blade is detachably attached to the cutting edge of a milling cutter, so that even if the tip becomes worn out, only that tip can be replaced.

However, with this technique, there is a limit to the number of chips that can be fixed to one milling cutter, and there are disadvantages in that the mounting space must be extremely large. 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 protrusion on the outer peripheral edge of the cutter body, formed a plurality of steps continuously on the radially outer surface of this protrusion, and If a cartridge is removably attached to the stepped portion, and a plurality of blade portions are fixed to the cartridge by a single tightening means, and a stepped portion corresponding to the bottom shape of the blade portion is formed at the bottom of the cartridge, It is easy to replace, and an extremely large number of blades can be installed.Also, even if the type of workpiece changes, it can be handled by simply replacing the cartridge with blades that match the workpiece. Furthermore, it has been found that when the blade is worn or broken, it can be easily repaired by simply replacing the blade with a new one, thereby eliminating the various inconveniences mentioned above.

Therefore, the purpose of the present invention is to provide a machine that is easy to handle, has excellent production efficiency, is suitable for precision cutting because it can be made with multiple blades, and can be cut quickly depending on the material of the workpiece. A milling cutter that can be easily replaced with a new blade when the blade is worn or broken, and can be repaired quickly. It is about providing.

In order to achieve the above object, the present invention forms a circumferential protrusion on the outer peripheral edge of a cutter body, and forms a plurality of stepped portions at equal intervals on the radially outer surface of the protrusion. Cartridges can be attached to the stepped part without any interruption and can be detached freely.
On the other hand, a large number of standardized blades are arranged in this cartridge in close contact with each other so that the cutting blades are equally spaced from each other, and these blades are further fixed to the cartridge by a single tightening means. It is characterized by

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 disc-shaped canter body, and a large diameter hole 12 is formed in the center portion of the cutter body 10. As shown in FIG. The end of a rotating shaft extending from the milling machine body is coupled to the hole 12, as will be described later.

Bolt insertion holes 14a to 14f are bored at a predetermined interval in the center of the main body of the canter body 10, which is formed into a ring shape by forming the hole 12 in this way.
Furthermore, a protrusion 18 is provided on the outer peripheral edge of the cutter body 10.
is formed. A plurality of holes 20a and 20b are formed in pairs from the inner surface in the radial direction to the outer surface of the protrusion 18, and
Further, a plurality of step portions 22 are formed continuously and at regular intervals on the radially outer surface of the protrusion I8, corresponding to the holes 20a, 20b forming the pair.

Therefore, in the above configuration, each of the step portions 2
2, the cartridge 24 is installed without interruption. As shown in FIGS. 3 and 4, the cartridge 24 has holding portions 24a and 24b that hold the blade from both ends thereof.
A hole 26a is formed in one holding part 24a, and a hole 26b is formed in the other holding part 24b.

In this case, the holes 26a and 26b are formed to be in a straight line, and on the other hand, surface portions 28a and 28b are formed on the outside of the holding portions 24a and 24b so as to expand outward from each other. Further, in the lower part of the cartridge 24, there are a plurality of step portions 30 that gradually become higher toward the center thereof, that is, step portions 30a, 30b, 30c, and 30 in this embodiment.
0d, and bolt insertion holes 32a and 32b are formed in the bottom of the cartridge 24.

Therefore, a generally plate-shaped so-called square chip 36 is fixed to the cartridge 24 configured as described above.

As shown in FIG. 5, the square chip 36 has a relatively thin tip 36a disposed on one outer side, and chips 36b, 36C, which are thicker than the chip 36a and stacked in a continuous manner. Includes 36d. The back surface of each of the chips 36a to 36d is provided with an escape groove 3 defined by an inclined surface in order to guide cutting chips to the outside during cutting.
It has 6e.

As easily understood from FIG. 6, the chips 36a to 3
The distances i between the cutting edges 36f of the chips 36d are equal to each other, and the chips 36d are provided with grooves 3 in order to unify the rake angle.
7 is formed, and a large diameter hole 38 is bored in the center of this square chip 36.

This square chip 36 is connected to the stepped portion 30 of the cartridge 24.
will be installed without interruption. That is, the square tips 36 are positioned in contact with each other on each of the stepped portions 30 so that the cutting edges 36f are positioned upward in the figure, and the bolts 40 are passed through the holes 26a and placed in the stepped portions 30. Penetrates through holes 38 of a plurality of square chips 36a to 36d provided,
Furthermore, the square knob 36 is fixed to the cartridge 24 by screwing into the hole 26b.

Therefore, the cartridge 24 configured as described above is mounted on the canter body 10. First, the cartridge 24 is brought into contact with each step 22 of the cutter body IO, the bolt 42 is passed through the hole 20, and the cartridge 24 is
The cartridge 24 is mounted on the canter body 10 by screwing into the bolt insertion holes 32a and 32b. Since the surfaces 28a and 28b of the cartridge 24 abut against the surfaces 28b and 28a of the adjacent cartridge, the cartridge 24 can be rotated around the canter body 10 and moreover firmly fixed.

Next, the bolt 54 is inserted into the holes 14a to 14f of the cutter body 10, and the tip of the bolt 54 is screwed into the hole 60 of the flange 58 formed on the spindle 56.

As a result, the canterbody IO is firmly connected to the flange 58.

The multi-blade cartridge 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 56 is rotated at high speed by a rotational drive source (not shown), the flange 58 integral with the spindle 56 also rotates, and the cutter body 10 fixed to the flange 58 via bolts 54 also rotates. At this time, since the plurality of cartridges 24 mounted on the canter body 10 have rectangular tips 36 fixed at equal intervals, it is possible to perform good continuous cutting on the workpiece. In this case, since the square tip 36 has a relief groove 36e and a sharp cutting edge 36f, the workpiece is cut by this cutting edge. Furthermore, the cutting waste generated by this cutting process is suitably led out to the outside because the clearance groove 36e acts as a clearance angle.

By the way, the workpiece is cut in the normal state as described above, but if the tip becomes worn or broken, it can be replaced as follows. That is, the cartridge 24 containing the worn or broken chip is removed, the bolt 40 fixing the chip is loosened, the chip is replaced with a new chip, and the chip is again fixed to the cartridge 24 via the bolt 40. Therefore, by attaching this cartridge 24 to the canter body 10 via the bolt 42, the chip replacement is completed and cutting can be continued. Furthermore, when selecting a tip corresponding to the type of workpiece, loosen the bolt 42 fixing the cartridge 24,
This can be achieved by replacing the cartridge with a cartridge having the desired chip.

As described above, according to the present invention, it is easy to handle and has excellent production efficiency, and it is possible to have multiple blades so that cutting can be performed as close to the grindstone as possible, and continuous cutting is possible. In addition, since a standardized blade can be used, it is easy to repair breakage and wear, and even for different types of workpieces, just by quickly replacing the cartridge, you can find the blade part that matches the workpiece. Can be exchanged. Furthermore, it has practical effects such as easy maintenance and management and the ability to quickly respond to various types of work.

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

[Brief explanation of the drawing]

FIG. 1 is a plan view of a canter body constituting a multi-blade cartridge type milling cutter according to the present invention, and FIG.
Figure 3 is a front sectional view of the cartridge, Figure 4 is a bottom view of the cartridge, Figure 5 is an assembly diagram of the cartridge and tip, and Figure 6 shows the cartridge and tip in the cutter body. FIG. 7 is a partially omitted plan view of the assembled state, and a vertical sectional view of the spacer attached to the cutter body.

Claims (2)

[Claims] (1) A circumferential protrusion is formed on the outer peripheral edge of the cutter body, a plurality of steps are formed at equal intervals on the radially outer surface of the cutter body, and a cartridge is inserted into each step without interruption. On the other hand, a large number of standardized blades are arranged in this cartridge in close contact with each other and the cutting blades are equally spaced from each other. A multi-blade cartridge type milling cutter that is fixed to the cartridge by a means. (2) A multi-blade cartridge type milling cutter according to claim 1, wherein a plurality of stepped portions corresponding to the bottom shape of the blade portion are formed at the bottom of the cartridge.