JP2000024822A - Key machining jig and fitted cutting edge for key machining jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a key machining jig that can improve cutting work efficiency. SOLUTION: A key machining jig 21 is provided with an arbor 23 with one end side 23a fitted to a chuck 22 and axially pushed in, and a fitted cutting edge 25 fitted and fixed to the other end side 23b of the arbor 23. The fitted cutting edge 25 is provided with a plurality of cutting edges of equal cutting edge length along the circumference and fitted and fixed to a fitting face 23e of a recessed part 23d in such a position that the tips of the cutting edges 25a-25c come closer to an axis as it is pushed in. Fitting is performed by a pin 27, and fixing is performed by a keep claw 29 and a stopper 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a key processing jig and a mounting blade of the key processing jig, in particular, a lathe and a milling machine, and is axially pushed into a work to cut a key groove. The present invention relates to a key processing jig to be used and a mounting blade of the key processing jig.

[0002]

2. Description of the Related Art There is a keyway cutting machine called a slotter or a key theta. The slotter cuts little by little while adjusting the depth of cut with a single blade, and cuts the keyway in the workpiece. The key theta adjusts the multi-blade with the same blade length and the line of cutting edges in a straight line from a diagonal posture to a standing position in the up and down direction, cuts little by little as the multi-blade posture changes, and The keyway is cut.

[0003] There is a broaching machine that performs cutting with a multi-blade broach. However, rather than a machine that cuts a keyway on a workpiece, it is used to process the inner diameter of the workpiece into a circle. It is something that can be done. Depending on the shape of the broach, a key groove can be formed on the inner diameter, but if you look only at the key groove processing, for example, to make multiple key grooves, a broach of that shape is used, or the upper and lower parts of the broach are pushed in Therefore, there is a problem that the machine itself becomes large because it needs to be used for drawing.

[0004]

The above-mentioned conventional slotter and key theta have the following problems. Since the slotter performs cutting with a single blade, the amount of cutting at one time is small, many times of cutting work is required while adjusting the cutting depth, it takes a long time, and the working efficiency is not sufficient .

[0005] The key theta is for cutting a multi-blade with the same cutting edge and a straight line of cutting edges in respective postures from an oblique posture to a posture standing up and down. In addition, it is necessary to carry out cutting work, and it is difficult to adjust the posture. In order to improve the accuracy, adjustment such as initial setting is cumbersome, and some skill is required, and the work efficiency is not sufficient.

SUMMARY OF THE INVENTION Accordingly, it is an object of the first invention to provide a "key processing jig which is pushed in an axial direction to cut a keyway into a workpiece", and is used for a lathe or a milling machine. It is an object of the present invention to provide a key processing jig that improves the working efficiency of key groove cutting of a workpiece. In addition, the second invention provides a key processing method that includes an arbor extending in the axial direction in order to cut a keyway in a workpiece, and is pressed in an axial direction by receiving a pressing force from one end of the arbor. To provide a mounting blade for a key processing jig that is used in lathes and milling machines to improve the work efficiency of keyway cutting of workpieces. I do.

[Key processing jig relating to the first invention] * 1 item *

[0008]

Means for Solving the Problems The solution of the present invention taken to solve the above-mentioned problem is that the arbor extends in the axial direction and receives a pushing force from one end thereof, and is detachably attached to the other end of the arbor. The mounting blade has a plurality of cutting blades in which the blades used during cutting are arranged in the axial direction, and the cutting edges of the plurality of cutting blades arranged in the axial direction become closer to the pushing direction. Characterized by a blade that approaches

The above-mentioned solution works as follows. The mounting blade has a blade such that the cutting edges of the plurality of cutting blades are closer to the axis as the pushing direction is reached, and the plurality of cutting blades are pushed in the axial direction to perform cutting, so that the cutting edge closer to the workpiece is used. Since deep cutting is performed in order, a large amount of cutting can be obtained by a single indentation by the number of blades as compared with a single blade such as a slotter. Further, even with the same multi-blade, it is not necessary to control the attitude of the blade, which is difficult to adjust as in the case of a key theta.

The mounting blade includes a metal saw type, a saw blade type, and a polygon type (triangle, square, pentagon, hexagon, etc.) described later. The mounting of the mounting blade to the arbor includes both a cantilever type and a double-sided type described later. Further, as a device to which the present invention is applied, an existing lathe or milling machine (including NC) may be used. In the case of a lathe, it may be attached to the tool post.

[0011]

According to the present invention having the above configuration, the following specific effects are obtained. Compared to cutting with a single blade like a slotter, the amount of cutting for one indentation can be increased, and there is no need for difficult attitude control of multiple blades like a key theta, so work time and work are complicated. Can be suppressed, and work efficiency can be improved as compared with the related art.

[0012] The metal saw type and the polygon type can be replaced so that a plurality of cutting blades can be replaced with a plurality of other cutting blades with the same mounting blade, and one mounting blade can withstand long-term use. Is possible. Also,
If a key processing jig is attached to a device that can rotate the arbor about the axis (for example, a lathe or milling machine),
There is no need to use a broach that cuts the inner diameter in consideration of the number and shape of key grooves as in a broaching machine, and a plurality of key groove cutting processes can be performed with one mounting blade.

Further, if the present invention is applied to an existing lathe, milling machine, or the like without manufacturing the entire device, there is an effect that the versatility that keyway cutting can be performed is high. Also, the ability to provide a highly versatile key processing jig that can be used for lathes and milling machines means that the performance of lathes and milling machines can be used.As a result, for example, a slotter There is no need to use an indexing table or the like for positioning such a workpiece. [Others] * Item 2 * According to the invention described above, a dent for mounting the mounting blade is formed on the other end side of the arbor so as to open the side surface, and the mounting blade is mounted on the mounting surface of the dent. (Which means the above-mentioned cantilever type), a hole is formed in the member corresponding to the arbor from the side toward the axis as in the case of the slotter, and the hole is closed. Unlike the case of further cutting into a shape for mounting a single blade, a simple cutting work such as the above-mentioned recess can be completed. This means that the work of cutting the above-mentioned recess is not only simple, but if there are multiple blades, the arbor mounting portion needs to be long, and further cutting work is required after making multiple holes in the arbor equivalent member. It can be said that it is much simpler than the simple case.

Therefore, the manufacturing operation of the present invention itself can be simplified, and the cost can be reduced. * Item 3 * According to the invention described above, the "mounting blade is composed of a plurality of blades having a disk shape and arranged along the circumference thereof and having the same blade length. The center of the mounting blade is rotatable while the mounting blade is rotatable. Attachment means to be attached to the side and fixation while stopping the rotation of the installation blade in a state where the cutting edges of a plurality of cutting blades out of a plurality of blades having the same blade length lined up along the circumference of the installation blade are closer to the axis in the pushing direction. (Meaning the above-mentioned metal saw type), as described above, since the plurality of cutting blades are a part of the entire blade, the fixing by the fixing means is released and the mounting blade is removed. By rotating the blade, cutting can be performed with a plurality of new cutting blades, and the total use time of one mounting blade can be extended without sharpening the used plural cutting blades.

A specific example of the attaching means is a pin, and a specific example of the fixing means is a stopper which holds the blade and a stopper which fixes the holding nail. * Item 4 * According to the invention described above, the "attachment blade is composed of a plurality of cutting blades arranged in a plate shape having a linear portion and arranged along the linear portion, and provided with a means for attaching and fixing a plurality of locations of the attachment blade to the arbor. The above-mentioned invention (which means the above-mentioned saw blade type) can easily realize the above-mentioned invention. In particular, in the case of a cantilever type, it can be realized particularly easily.

The saw blade type includes both blades arranged in a line and blades arranged alternately in different directions. Further, the saw blade type includes a blade having a shorter blade in the pushing direction and a blade having the same blade. Further, it does not matter whether a blade is formed other than the straight portion of the saw blade type. However, when a plurality of cutting blades are formed only on the straight portion and no other blade is formed on the mounting blade, no blade is formed on the opposite side to the straight portion, so the blade can be pushed out from the opposite side. Such a height adjustment mechanism may be provided. The height adjusting mechanism has an effect that, for example, the blade can be sharpened to cope with a short blade.

* Item 5 * In the above invention, "the mounting blade is characterized in that the cutting edges of a plurality of cutting blades are alternately positioned in different directions". It is hard to be entangled with other cutting blades, and smooth cutting can be performed in addition to the above effects. [Mounting blade for key processing jig according to second invention] * 6 item *

[0018]

Means for Solving the Problems The solution of the present invention taken to solve the above-mentioned problem is that "the arbor is detachably mounted and fixed to the other end of the arbor, and is arranged in the axial direction used for cutting. It has a plurality of cutting blades, and the cutting edges of the plurality of cutting blades are configured to be closer to the axis in the pushing direction ”.

According to the above-mentioned solution, a mounting blade which produces the function and effect of the first invention can be obtained. As in the case of the first invention, the mounting blade is a metal saw type, a saw blade type, or a polygon type (triangle, square,
Pentagon, hexagon, etc.). Similarly to the case of the first invention, the mounting of the mounting blade to the arbor includes both a cantilever type and a double-support type described later.

[0020]

According to the present invention having the above configuration, the following specific effects are obtained. It is possible to provide a mounting blade as a replacement blade for the mounting blade that exhibits the effects of the first invention. [Others] * Item 7 * According to the invention described above, the "mounting blade is composed of a plurality of blades having a disk shape and having equal blade lengths arranged along the circumference thereof, and the center portion thereof is rotatable in the other end of the arbor. Side, and the cutting edges of a plurality of cutting blades out of a plurality of blades having the same blade length lined up along the circumference are fixed while stopping the rotation in such a state that the cutting edges are closer to the axial center in the pushing direction. Can provide a mounting blade as a metal saw type replacement blade.

<Regarding item A> In the above invention, the "attachment blade" is formed of a plurality of cutting blades arranged in a plate shape having a linear portion and arranged along the linear portion, and a plurality of portions are attached to the arbor and fixed. Can provide a mounting blade as a replacement blade of the aforementioned saw blade type. <Regarding item B> In the above-mentioned invention, "the mounting blades are characterized in that the cutting edges of a plurality of cutting blades are alternately positioned in different directions" are described in the aforementioned saw blade type (the cutting edges are arranged in a line). Can be provided as a replacement blade.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described together with the illustrated example. FIG. 1 is a view showing a state in which a key processing jig according to an embodiment of the present invention is attached to a chuck portion of an NC lathe. FIG. 2 is a diagram showing the key processing jig of FIG. FIG. 3 is a view of FIG.
It is an I-III line sectional view.

Referring to FIG. 1, the keying jig (21) is pushed in the axial direction to cut a keyway into a workpiece, and includes an arbor (23) and a mounting blade (25). It is mainly composed of In this embodiment, the key processing jig (2
As the configuration of 1), there are a pin (27) as an attaching means, and a pressing claw (29) and a stopper (31) as fixing means. First, the arbor (23) will be described. The arbor (23) has a shape extending in the axial direction, and one end (23a) has a chuck (3a).
The key processing jig (21) is attached to one end (23) when the chuck (33) is attached in the axial direction indicated by the arrow.
a) Receive the pushing force from. Although the one end (23a) side is cylindrical, the mounting blade (25) is detachably attached and fixed toward the other end (23b) side in FIGS. 1, 2, and 3.
It has a different shape from the cylinder as shown in FIG. First,
At the stage of proceeding from the one end (23a) side to the other end (23b) side, there is a flat portion (23c) cut in a plane, and the side of the other end (23b) has a mounting blade (25). Recess for mounting (23d)
Is formed to open the side surface. The mounting blade (25) is mounted and fixed on the mounting surface (23e) of the recess (23d).

Next, the mounting blade (25) will be described. The mounting blade (25) has a plurality of cutting blades (25a), (25b) and (25c) in which the blades used for cutting are arranged in the axial direction, and the cutting blades (25a), (25b) and (25b) 25c) is configured such that the cutting edge approaches the axis in the pushing direction. This means that the cutting edge of the cutting blade (25c) is lower than that of the cutting blade (25a) in FIG.
It means that it is located on the axis side for one minute.

The mounting blade (25) shown in FIG. 1 is a metal saw type having a disk shape satisfying the above-mentioned requirements and having a plurality of blades having the same blade length and arranged in plural along the circumference.
Then, attach the center of the mounting blade (25) to the mounting surface (2
3e), the rotation of the mounting blade (25), which is rotatable in the mounted state, is held down by the presser pawl (29) which meshes with other blades other than the cutting blades (25a), (25b) and (25c). The mounting blade (25) is fixed using the stopper (31) so that the mounting blade (25) does not come off. That is, the pin (27) serves as an attachment means for attaching the attachment blade (25) to the other end (23b) of the arbor (23) as described above,
Pressing claw (29) and stopper (31) are cutting blades (25a), (25b)
, (25c) is a fixing means for fixing the mounting blade (25) in a state that satisfies the conditions of (25c). Here, the plane portion (23c) of the arbor (23) is formed by the cutting blades (25a), (25b),
This is to enable the cutting in (25c).

In the case of a metal saw type mounting blade (25), the holding blade (29) and the stopper (31) are removed, and the mounting blade (25) is rotated to cut the cutting blades (25a) and (25b). ,
There is a merit that a plurality of other blades other than (25c) can be used as a new plurality of cutting blades. Therefore, the use time of one mounting blade (25) can be lengthened, and the durability as the mounting blade (25) improves.

Further, the holding claw (29) and the stopper (31) are removed, and the pin (27) is also removed, so that another mounting blade (25) can be replaced. , Old mounting blade (25) as replacement blade
It suffices if it is replaced by (25) and replaced. By using such a key processing jig (21), the existing NC
Keyway cutting can be performed without making any changes to the lathe. At this time, unlike a single blade such as a slotter, the cutting is performed with a plurality of blades, so the amount of cutting increases, and the cutting time can be shortened to improve the working efficiency. In addition, since the cutting operation is performed by pushing in the axial direction, a difficult attitude control such as a key theta is not required, so that the operation can be reduced in complexity and the operation efficiency can be improved.

The above L1 is preferably about 0.1 to 0.2 mm. In addition, the key processing jig (21) has been described as being used for an existing NC lathe, but it can also be used for a simple lathe or a milling machine (regardless of NC). It can be said that 21) is highly versatile. Here, the positioning and the like may be performed by using an ordinary lathe or milling machine.For example, in the case of a milling machine, the workpiece may be positioned using a touch sensor or the like, and the arbor is rotated to cut a plurality of keyways. It can also be processed.

FIG. 4 is a view showing a main part of a key processing jig according to another embodiment of the present invention, and FIG. 5 is a view of the key processing jig of FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5, and FIG. 7 is an enlarged view of the mounting blade in FIG. Referring to FIG. 4, the key processing jig (51) mainly includes an arbor (53) and a mounting blade.
(55). The arbor (53) is the arbor (2
Similarly to 3), it extends in the axial direction and receives a pushing force from one end (not shown). A mounting blade (55) is detachably mounted and fixed to the other end (53a) of the arbor (53). The arbor (53) has a flat surface (5
3b) portion, and the other side (53a) has a mounting blade (5
A recess (53c) for mounting 5) is formed so as to open the side surface. Then, the mounting blade (55) is
c) is fixed to the mounting surface (53d), and the mounting and fixing are performed at a plurality of locations by the knock pins (57a) and the knock pins (57b). Therefore, the knock pin (57a) and the knock pin (57b) connect the arbor (5
It is a means to attach and fix to 3).

Next, the mounting blade (55) will be described. Similarly to the mounting blade (25), the mounting blade (55) has a plurality of cutting blades (55a), (55b),
(55c), (55d), (55e), (55f), and (55g), the blades of a plurality of cutting blades (55a) to (55g) arranged side by side move closer to the axis in the pushing direction. Has become. However, in this respect, the mounting blade (55) is the same as the mounting blade (25), except that the mounting blade (55) is a plate having a linear portion (55h) and is arranged along the linear portion (55h). It is composed of only a plurality of cutting blades (55a) to (55g). That is, the mounting blade (55) is
5a) It does not have any blades other than (55g).

The point that the cutting edges of the cutting blades (55a) to (55g) are configured such that the closer to the axial center in the pushing direction is,
The difference between the cutting edge of the cutting blade (55a) and the cutting edge of the cutting blade (55g) is indicated by L2. Here, L2 is 0.1
About 0.2 mm is preferred. Further, the cutting blades (55a) to (55g) of the mounting blade (55) will be described with reference to FIG. The cutting blades (55a) to (55g) are set such that the cutting edges are alternately located in different directions. That is, the cutting blade (55a)
, (55c), (55e), and (55g) are oriented in the first direction, and the cutting blades (55b), (55c), (55d), and (55f) are different from the first direction. Facing the direction. This is a contrivance for preventing cutting chips from becoming dull during cutting.
However, depending on the number of cutting blades and the distance L2 in FIG. 4, a plurality of cutting blades may be simply arranged in a line.

Here, the case of the metal saw type mounting blade (25) in FIG. 1 is compared with the case of the saw blade type mounting blade (55) in FIG. Since the saw blade type mounting blade (55) is only the cutting blade (55a) to (55g), it cannot be replaced to use multiple new cutting blades like the metal saw type mounting blade (25). However, there is an advantage that the manufacturing of the key processing jig by manufacturing the mounting blade, manufacturing the arbor, and mounting the mounting blade to the arbor can be simplified and the cost can be reduced.

FIG. 8 is a view showing a main part of a key processing jig according to still another embodiment of the present invention, and FIG. 9 is a sectional view taken along line IX-IX of FIG. The differences between FIGS. 8 and 9 will be described in comparison with FIGS. 5 and 6. The key processing jig (71) is similar to the key processing jig (51)
An arbor (73) corresponding to (53) and a mounting blade (75) corresponding to the mounting blade (55) are mainly provided. However, although the shape of the arbor (73) has a flat portion (73b) corresponding to the flat portion (53b), the concave portion (53c) is not formed, and the mounting blade (7
5) A groove (73c) for mounting is provided. Groove (73c)
Does not have the shape of a concave part (53c) with an open side, but has a deeply carved shape.When the mounting blade (75) is fitted in the groove (73c), the mounting blade (75) is On both sides are the other end side (73a) of the arbor (73). That is, in the case of FIG. 5, it is a cantilever type, while in the case of FIG. 8, it is a double-support type. In the case of this double-supporting type, the mounting blade (75) is fitted into the groove (73c), and the mounting blade (75) is mounted and fixed to the other end (73a) by the knock pin (77a) and the knock pin (77b). Will be done.

The shape of the plurality of cutting blades of the mounting blade (75) may be a shape as shown in FIG. 7 or a shape simply arranged in a line. In the case of FIG. 4 (FIG. 5), FIG.
In both cases, only the cutting blade constitutes the blade of the mounting blade and does not have any blade other than the cutting blade as in the case of FIG. 1, but for example, the straight portion (55h) of the mounting blade (55) in FIG. ) Is also formed in the straight part (55i) on the side opposite to), and a concave part (53c) is provided to correspond to it, and without cutting the cutting blades (55a) to (55g), the straight part One attachment blade may be used for a long time by replacing the other plurality of cutting blades provided in (55i).

Further, by proceeding with the idea of this point and approaching the concept of a circle in FIG. 1, if it is a triangle, a plurality of cutting blades are formed on each of three sides, and a plurality of cutting blades arranged on one side are formed. It is also possible to use a plurality of cutting blades arranged on another side without polishing. Therefore, a configuration in which a plurality of cutting blades are provided on each side with a polygonal mounting blade such as a quadrangle, a pentagon, and a hexagon (however, a plurality of cutting blades may be provided on each side of the polygon) It is not necessary to form it, and there may be a side on which the cutting blade is not formed.) Further, a metal saw type mounting blade, a polygonal type mounting blade shown in FIG. 1, or a double-supported type as shown in FIG. Good.

Further, the direction of the cutting edge of the metal saw type mounting blade and the polygon type mounting blade may be alternately located in different directions, or may be located in the same direction. May be. Further, FIG.
The cutting blades shown in FIG. 5 (FIG. 5) and FIG. 8 shorten the cutting edge in the pushing direction so that the cutting edge is closer to the axis in the pushing direction. In this case, it is possible to make the cutting edge closer to the axis by pushing the cutting edge in the pushing direction by making the straight portion (55h)) oblique from the axis. This point is the same in the case of a polygon. For example, if it is a quadrangle, it may be shaped like a parallelogram.

Further, as long as the metal saw type mounting blade and the polygon type mounting blade shown in FIG. 1 are used, a plurality of different cutting blades can be used by replacement. In the case of FIG. 4 and FIG. In some cases, it may be necessary to grind multiple cutting blades.In this case, the blade length of the mounting blade is shortened by the amount of polishing, and it may be necessary to mount the cutting blade in the direction to push out the cutting blade in relation to the workpiece. Conceivable. In consideration of this, a height adjusting mechanism may be provided.
For example, the pin fixing hole of the mounting blade may be elongated, a bolt may be tightened from behind the arbor, and a height adjustment mechanism may be provided such that the mounting blade is pushed forward by tightening the bolt. Good.

Further, it goes without saying that a key processing jig other than the key processing jig (21) can also be used for an existing lathe or milling machine (regardless of NC). FIG.
FIG. 11 is an enlarged view of a main part of the arbor of FIG. 8, and FIG. 11 is an enlarged view of a main part of the arbor of FIG. With reference to FIG. 10 and FIG. 11, a difference between manufacturing processes of the cantilever type and the double-sided type will be described. In the case of the two-sided type shown in FIG. 10, the other end side (73a) of the arbor (73) is located
A plurality of holes (79) are provided with a drill or the like. At this stage, the groove
Instead of the shape shown in (73c), there is a remaining portion (81), and it is necessary to form a groove such as the groove (73c) finally by shaving this portion with a file or the like. On the other hand, in the case of the cantilever type shown in FIG. 11, the side part connected to the plane part (53b) on the other end side (53a) of the arbor (53) is:
The recesses (53c) may be formed in this order. Also in FIG. 10, it is likely that only one-way shaving is required in the flow of FIG. 10. However, what is important in the mounting of the mounting blade is the mounting surface. Clearly, comparing with the case, FIG.
The case of 1 can be completed with a simpler process.
Therefore, the manufacturing process of the arbor is simpler in the case of the cantilever type than in the case of the double-sided type, so that the manufacturing cost of the key processing jig can be reduced.

[Brief description of the drawings]

FIG. 1 shows a key processing jig according to an embodiment of the present invention.
It is the figure which showed the state attached to the chuck of the lathe.

FIG. 2 is a view of the key processing jig of FIG. 1 viewed from a direction II.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a diagram showing a main part of a key processing jig according to another embodiment of the present invention.

FIG. 5 is a view of the key processing jig of FIG.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

FIG. 7 is a view of the mounting blade of FIG. 4 viewed from the direction of VII.

FIG. 8 is a view showing a main part of a key processing jig according to still another embodiment of the present invention.

FIG. 9 is a sectional view taken along line IX-IX of FIG. 8;

FIG. 10 is a view showing the vicinity of a groove of the arbor of FIG. 8;

FIG. 11 is a view showing the vicinity of a concave portion of the arbor of FIG. 4;

[Explanation of symbols]

 (21), (51), (71): Key processing jig (23), (53), (73): Arbor (25), (55), (75): Mounting blade ( 27) Pin (29) Pressing pawl (31) Stopper (57a), (57b), (77a), (77b) Knock pin (23d), (53c) Recesses (23e), (53d) ... Mounting surface (25a)-(25c), (55a)-(55g) ... Cutting blade

Claims (7)

[Claims] 1. A key processing jig which is pressed in an axial direction to cut a key groove in a workpiece, and extends in the axial direction and receives a pressing force from one end thereof. A mounting blade that is detachably attached to and fixed to an end side, the mounting blade has a plurality of cutting blades in which blades used during cutting are arranged in the axial direction, and the plurality of A key processing jig, characterized in that the cutting edge is configured with a blade that approaches the axis in the pushing direction. 2. A dent for mounting the mounting blade is formed on the other end side of the arbor so as to open a side surface, and the mounting blade is mounted on a mounting surface of the concave. The key processing jig according to claim 1, wherein the key processing jig is fixed. 3. The mounting blade is formed of a plurality of blades having a disk shape and having equal blade lengths arranged along the circumference thereof, and the center portion of the mounting blade is rotatable in a rotatable state with the other end of the arbor. Mounting means attached to the side, stopping rotation of the mounting blade in a state where the cutting edges of a plurality of cutting blades among a plurality of blades having equal blade lengths arranged along the circumference of the mounting blade are closer to the axial center in the pushing direction. The key processing jig according to claim 1, further comprising: fixing means for fixing the key processing jig. 4. The mounting blade is composed of a plurality of cutting blades arranged in a plate shape having a linear portion and arranged along the linear portion, and includes means for mounting and fixing a plurality of portions of the mounting blade to the arbor. The key processing jig according to claim 1 or 2. 5. The key processing jig according to claim 4, wherein the mounting blades have cutting edges of a plurality of cutting blades alternately positioned in different directions. 6. A mounting blade of a keying jig which is provided with an arbor extending in an axial direction for cutting a key groove in a workpiece, and which is pushed in an axial direction by receiving a pushing force from one end of the arbor. It has a plurality of cutting blades which are detachably attached and fixed to the other end side of the arbor, and are arranged in the axial direction used at the time of cutting. An installation blade for a key processing jig, characterized by being configured with a blade approaching the above. 7. The mounting blade is composed of a plurality of blades having a disk shape and having equal blade lengths arranged along the circumference thereof, and a center portion thereof is rotatably mounted on the other end side of the arbor. 7. The key processing according to claim 6, wherein rotation is stopped and fixed while the cutting edges of the plurality of cutting blades among the plurality of blades having the same blade length arranged along the circumference are closer to the axis as the pushing direction. Jig mounting blade.