JPH0555244B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of machining knot grooves in the caliber of a rolling roll using an end mill.

(Prior art) Traditionally, steel bars have been used as reinforcement for building structures due to their adhesive strength with concrete and ease of construction.
Various deformed steel bars having corrugated nodes, parallel nodes, threaded nodes, etc. have been proposed.

By the way, in order to roll such a deformed steel bar, it is necessary to machine knot grooves for forming knots in the steel bar in the caliber of the rolling roll.

Conventionally, the electric discharge machining method has been generally adopted as a method for machining this knot groove.
Coupled with the low machinability of electrical discharge machining, the machining time is long, so it is necessary to have a large number of spare rolling rolls.

Furthermore, when re-grinding a rolling roll during repeated use, in order to equally divide the nodal grooves around the roll's outer periphery, the outer diameter is naturally constrained, so the amount of cutting is inevitably large. This has led to an increase in production costs due to an increase in roll costs that account for rolling costs.

From this point of view, instead of the above electric discharge machining method,
A machining method has been proposed in which a nodal groove is cut by rotating a cutting tool around the center of a caliber (see, for example, Japanese Patent Laid-Open No. 56-56317 and Japanese Utility Model Publication No. 59-9777). However, the conventional machining method described above is a straight groove machining based on the pitch, and cannot process curved grooves such as a U-shape, and the folded part of the groove leaves a triangular uncut portion, so chamfering is required. I had a problem that I thought was necessary.

In order to solve this problem, the present applicant has made it possible to accurately and quickly process corrugated and screw-shaped grooves in addition to parallel grooves on the caliber of a rolling roll using an end mill. We have previously proposed a method for machining knot grooves on rolling rolls (patent application 1986-
No. 78044).

This knot groove machining method is angle-based groove machining using an end mill, and has the advantage that a knot groove of any shape can be formed. However, it has been found that in rolling using rolling rolls in which knot grooves of constant depth are formed by this method, deformation and burrs occur at the knots of the product due to kick-up.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and it is possible to prevent deformation or burrs from occurring in the knots of the product by improving the above-mentioned method for forming knot grooves on the roll. The purpose of the present invention is to provide a method for machining knot grooves on rolls, which makes it possible to process knot grooves in rolls, thereby stabilizing product quality, improving durability of rolls, and reducing costs. be.

(Structure of the Invention) Therefore, the first aspect of the present invention is a method of machining knot grooves in the caliber of a rolling roll using an end mill, and in which the diameter reduction position inward from the center of the caliber is set as the oscillation center of the end mill. The process involves machining a knot groove on the bottom of the caliber while swinging the end mill within an angle range in which the rear part does not contact the shoulder of the caliber in a plane that includes the rolling roll axis, and a process in which the rear part contacts the shoulder of the caliber in the plane mentioned above. While holding the end mill at an angle that is not tilted, move the pivoting center of the end mill along a predetermined trajectory relative to the diameter reduction position, and insert a nodal groove in the shoulder of the caliber that is shallower than the nodal groove at the bottom of the caliber. The structure consists of a process of processing.

In addition to the first invention, the second invention includes a step of rotating a rolling roll in synchronization with each of the above steps.

(Effects of the Invention) According to the first aspect of the present invention, while swinging the end mill, the center of swing of the end mill is set at a reduced diameter position in front of the center of the caliber, and along a predetermined trajectory with respect to this reduced diameter position. By moving the caliber, a nodal groove of the required depth is machined on the bottom of the caliber, and a nodal groove shallower than the nodal groove at the bottom of the caliber is machined on the shoulder of the caliber, so it is possible to create a parallel joint. Nodal grooves can be machined accurately and quickly.

Also, the nodal grooves on the shoulder of the caliber are made shallower than the required depth nodal grooves on the bottom of the caliber.
During rolling, the joints of the product are less likely to lose their shape or burr due to kicking up, and the wear and deformation of the nodal grooves of the rolling rolls are reduced, improving durability. At the same time, the yield rate of the corner joints of the product is reduced. improves.

Furthermore, since it is not necessary to completely remove the knot grooves when the rolling roll is used repeatedly, the amount of outer diameter cutting is reduced, and the cost of the roll is reduced.

According to the second invention, while swinging the end mill, the center of swing of the end mill is moved to a reduced diameter position in front of the center of the caliber and along a predetermined trajectory with respect to this reduced diameter position. Because the rolling rolls are rotated in synchronization,
The effect of the first invention can also be exerted on wave-shaped or screw-shaped knot grooves.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, a base (bed) 1 that supports a rolling roll 11 is placed on a work floor 10.
2 is installed, and on one side (left side) of the base 12,
Main shaft 1 supporting one end 11a of the rolling roll 11
A spindle head 14 with a base 1 is provided.
On the other side (right side) of 2, a tail stock 16 is provided which includes a center shaft 15 that supports the other end 11b of the rolling roll 11.

The main shaft 13 and one end 11a of the rolling roll 11
are connected by a connecting fitting 17 (see FIG. 4), and the rolling roll 11 is rotated by the main shaft 13 at a predetermined speed by driving the main shaft motor 18.

A rail portion 20 extending parallel to the rolling roll 11 is formed on the base 12.
, a parallel moving table 21 is supported so as to be able to reciprocate in a direction parallel to the rolling roll 11.

The parallel movement table 21 is connected to a screw shaft 23 driven by a parallel movement motor 22 installed on the other side (right side) of the base. Translation table 21
is moved back and forth at a predetermined speed.

A rail portion 25 extending at right angles to the rolling roll 11 is formed on the parallel moving table 21, and a right angle moving table 26 is formed on the rail portion 25.
It is supported so as to be able to reciprocate in a direction perpendicular to the main body.

The orthogonal moving table 26 is connected to a screw shaft (not shown) driven by a orthogonal moving motor 27 installed at the lower part of the parallel moving table 21, and is driven by the orthogonal moving motor 27. As a result, the right angle moving table 26 is moved back and forth at a predetermined speed.

As shown in FIG. 3, FIG. 4, and FIG. A rocking table 29 is supported which can swing back and forth in the horizontal direction.

The rocking table 29 has a pinion 31 (see FIG. 8) driven by a rocking motor 30 installed at the rear of the rocking table 29 that meshes with a semicircular gear 32 mounted on the right-angle moving table 26. By driving the swing motor 30, the swing table 29 is reciprocated about the swing shaft 28 at a predetermined speed by the planetary rotation motion of the pinion 31.

In addition, the details of the right angle moving table 26 and the rocking table 29 are as follows.
This will be explained later with reference to FIGS. 7 and 8.

The rocking table 29 rotatably supports, via a chuck 35, an end mill 34 for machining corrugated knot grooves 33C as shown in FIGS. 6a and 6b, for example, in the caliber 9 of the rolling roll 11. head 36
is installed.

As shown in FIG. 3, the center EC of the end mill 34 supported by the chuck 35 is set to coincide with the center RC of the rolling roll 11.

The end mill 34 is rotated at a predetermined speed by a cutter motor 37 installed at the rear of the head 36.

It is preferable that the end mill 34 has a chamfered portion (see FIG. 10) 34a formed on the cutting edge so that knotting and chamfering can be performed simultaneously if necessary.

The details of the head 36 will be explained later with reference to FIG.

As shown in detail in FIGS. 7 and 8, the right-angle moving table 26 is formed in a semicircular shape centered on a swing shaft 28 (see FIG. 5), and on the right-angle moving table 26, The semicircular gear 3 centered on the swing shaft 28
2 is attached (see the same figure).

The center hole 29a at the tip of the swinging table 29 is fitted into the swinging shaft 28, and the hook 29b at the rear lower part is engaged with the outer circumferential groove 26a of the right-angle moving table 26. The upper part of the roller 11 is slid in the horizontal direction with respect to the rolling roll 11 and is oscillated back and forth.

The rocking table 29 is provided with a horizontal shaft 40 supported by bearing members 39, 39, the horizontal shaft 40 is connected to the rocking motor 30, and a worm 41 is mounted on the horizontal shaft 40. It is formed.

Further, the rocking table 29 is provided with a vertical shaft 43 supported by bearing members 42, 42.
A worm wheel 44 that meshes with the worm 41 of the horizontal shaft 40 is formed on the horizontal shaft 40, and the pinion 31 that meshes with the semicircular gear 32 is fixed to the lower part of the horizontal shaft 40.

Therefore, when the swing motor 30 is driven, the horizontal shaft 40, the worm 41, the worm wheel 44,
The pinion 31 is rotated via the vertical shaft 43, and the pinion 31 makes a planetary rotation movement while meshing with the semicircular gear 32, so that the rocking table 29 is rotated about the rocking shaft 28 with respect to the rolling roll 11. It begins to swing back and forth in the horizontal direction.

As shown in detail in FIG. 9, bearing members 47, 4 are attached to the sliding sleeve 46 at the front of the head 36.
The shaft portion 35a of the chuck 35 is supported through the shaft portion 7, and a bearing member 48, coaxially with the shaft portion 35a of the chuck 35 is provided at the rear of the head 36.
..., 48 is provided, and the chuck 3 is provided in the hollow portion of the hollow rotating shaft 49.
The rear portions of the shaft portions 35a of No. 5 are fitted and connected by a serration portion 50.

The gear 51 attached to the hollow rotating shaft 49 and the gear 53 of the output shaft 52 of the cutter motor 37 are connected by a gear system 54 .

A screw shaft 57 supported by a bearing member 56 is provided on the top of the head 36 in parallel with the chuck 35 and the hollow rotating shaft 49, and a bevel gear 59 of the screw shaft 57 is provided on the top surface of the head 36. The bevel gear 62 of the handle shaft 61 of the hand-operated handle 60 is engaged with the bevel gear 62, and the female screw block 63, which is engaged with the screw shaft 57, is connected to the rear portion of the sliding sleeve 46.

Therefore, when the manual handle 60 is rotated, the screw shaft 57 is rotated via the handle shaft 61, the bevel gear 62, and the bevel gear 59, and the screw shaft 57 rotates the sliding sleeve 46 through the female thread block 63.
By moving the chuck 35 back and forth, the extended position of the end mill 34 can be adjusted.

Further, when the cutter motor 37 is driven, the gears 53, 51, the hollow rotating shaft 49, the serration section 5
An end mill 34 is rotated by a chuck 35 through the shaft 0.

Returning to FIGS. 1 and 2, the parallel movement table 21 is provided with an operation panel 65 for controlling each motor 18, 22, 27, 30, etc., and the operation panel 65 is a control (NC) device. 66.

The control device 66 includes, as shown in FIG.
The oscillating table 29 is configured such that the end mill 34 oscillates around the reduced diameter position P', which is forward of the center P of the caliber 9, in an angular range θ ₂ in which the rear part does not contact the caliber shoulder 9a. The circuit device A that controls the swing angle of the end mill 34 and the swing center of the end mill 34 are
The orthogonal moving table 26 and the parallel moving table 2 are moved so as to move along predetermined trajectories l and l' with respect to the diameter reduction position P'.
1, and a circuit device B for controlling the relative movement amount of the rolling roll 11 in synchronization with the movement amount of the parallel movement table 21 and the orthogonal movement table 26 and the rocking angle of the rocking table 29.
A circuit device C for controlling the rotation angle R (see FIG. 14) is built in.

Next, the relationship between the oscillations θ ₁ to _{θ 3} of the end mill 34 and the movement trajectories l and l' will be explained.

As shown in FIG. 10, the end mill 34 is set to a radius γ that cuts into the inner circumferential surface of the caliber 9 to a predetermined depth, with the oscillation center being at the diameter reduction position P' which is forward of the center P of the caliber 9. When the end mill 34 is oscillated in the caliber bottom 9b, the knot groove 33 can be formed in the caliber bottom 9b within an angular range (oscillation machining range) θ ₂ in which the rear part of the end mill 34 does not come into contact with the caliber shoulder 9a.

However, if the end mill 34 is further swung within the angle range (swing angle range) θ ₁ or θ ₃ in this state, the rear part of the end mill 34 will move to the caliber shoulder 9a.
Since the caliber shoulder 9a will come into contact with the
It is not possible to machine the knot grooves 33.

Therefore, the maximum angle position of the center of the cutting edge in the angle range θ ₂ of the end mill 34 is set as the machining mode change points b, c, and when the end mill 34 is in this maximum angle state, the center of the cutting edge is the machining mode change point b, c.
so as to reach the processing start (end) points a and d from
When the swing center of the end mill 34 is moved along predetermined paths l and l' (see the two-dot chain line), the caliber shoulder 9
Nodal grooves 33 can be machined in a and 9a.

The end mill 34 includes each of the moving tables 21, 26,
It is actually controlled as follows using the moving table 29, the control device 66, etc.

In FIG. 11a, the parallel movement table 21 is moved to the right, the right-angle movement table 26 is retreated, and the swing table 29 is swung to the right, so that the center of swing of the end mill 34 is at point _P1 (preparation position). .

In Fig. 11b, move the right angle moving table 26 forward.
X ₁ to move the swing center of the end mill 34 to point P ₂ (starting position).

At this position, the center of the cutting edge of the end mill 34 coincides with the machining start point a.

In Fig. 11c, while moving the right angle moving table 26 further forward by _X2 , the parallel moving table 21 is moved to the left by Z/2.
The center of oscillation of the end mill 34 is set at the locus l.
When moving from point P ₂ to diameter reduction position P', the center of the cutting edge of the end mill 34 moves within the moving machining range θ ₁ from the machining start point a to the machining mode change point b,
A nodal groove 33 shallower than a nodal groove 33 of a caliber bottom portion 9b, which will be described later, is machined in the right caliber shoulder portion 9a.

In FIGS. 11 d to 11 e, the rocking table 29
to the left to move the end mill 34 to the reduced diameter position.
When the end mill 3 is oscillated using P' as the fulcrum,
The center of the cutting edge of No. 4 moves in the swing machining range θ ₂ from the machining mode change point b to the machining mode change point c, and a nodal groove 33 is machined in the caliber bottom 9b.

In Fig. 11 f, move the right angle moving table 26 backward.
When the parallel movement table 21 is moved to the left by Z/2 while moving _X2 , and the swing center of the end mill 34 is moved from the diameter reduction position P' to the _P3 point (end position) along the locus l',
The center of the cutting edge of the end mill 34 moves in the movement machining range θ ₃ from the machining mode change point c to the machining end change point d, and a knot is formed in the left caliber shoulder 9a that is shallower than the aforementioned knot groove 33 in the bottom portion 9b. Grooves 33 are machined.

In Fig. 11g, move the right-angle moving platform 26 backward.
X ₁ to move the swing center of the end mill 34 to point P ₄ (retreat position).

Thereafter, the parallel moving table 21 is moved to the right (Z), the swing table 29 is moved to the right, and the center of swing of the end mill 34 is returned to point _P1 (preparation position), resulting in the state shown in FIG. 11a.

Instead of this control method described above, the end mill 34
is swung around the caliber center P instead of the diameter reduction center P', and the nodal groove 33 is formed in the caliber bottom 9b.
, and the swing center of the end mill 34 is
In the control method of machining the knot grooves 33 in the caliber shoulders 9a, 9a by moving along the loci l, l' from the caliber center P instead of the diameter reduction center P', as shown by crosshatching in FIG. Since the nodal groove depths of the caliber bottom part 9b and the caliber shoulders 9a, 9a were the same, the nodal grooves of the rolling roll 11 would be deformed due to kicking up, and the wear of the nodal grooves of the rolling roll 11 would increase. In addition, when the rolling roll 11 is used repeatedly, it is necessary to completely remove the knot grooves, resulting in problems such as an increase in roll cost.

However, according to the present control method, the depth of the nodal grooves in the caliber shoulders 9a, 9a is made shallower than in the caliber bottom 9b, so that the above-mentioned problem is solved.

11a to 11b show the parallel knot groove 33
This shows the procedure for machining A. Threaded joint groove 3
3B, the corrugated grooves 33C and 33D are processed by rotating the rolling rolls 11 synchronously based on the processing procedure for the parallel grooves 33A. The details will be explained later.

To set the extension amount (cutting amount) of the end mill 34, as shown in Fig. 12a, set the caliber center P.
Attach the reference setting gauge 71 set to the cutting edge of the end mill 34 aligns with the diameter reduction position P', and then
As shown in Fig. 2c, the end mill 34 is
When the end mill 34 is advanced to the diameter reduction position P' (see Figure 0), the center of swing of the end mill 34 coincides with the diameter reduction position P'.

Hereinafter, processing procedures for the various knot grooves 33A to 33C will be explained.

(1) Machining procedure for the parallel joint groove 33A As shown in Figure 13, in the case of the parallel joint groove 33A, follow the steps in Figures 11a to 11g to set the swing center of the end mill 34. Move from point P ₁ to point P ₂ , move from point P ₂ along the path l to diameter reduction position P', and move from the machining start point a to the machining mode change point b in the machining range θ ₁ . ) 9a, and then the end mill 34 is oscillated about the diameter reduction position P' as the oscillation center, and the oscillation processing range θ ₂ is obtained from the processing mode change point b to the processing mode change point c. A knot groove of the required depth is machined in the caliber bottom 9b, and the swing center of the end mill 34 is
Move to P ₃ on the trajectory l′ and change the machining mode c
A shallow knot groove is machined in the caliber shoulder (left) 9a in the moving machining range θ ₃ from to the machining end point d.

Then, while moving the swing center of the end mill 34 from point P ₄ to point P ₁ , the rolling roll 11 is
Rotate the parallel knot groove 33A by one pitch and repeat the above procedure.

(2) Processing procedure for threaded nodal groove 33B As shown in Fig. 14, in the case of threaded nodal groove 33B having a predetermined inclination angle θa, the procedure is almost the same as in Figs. 11a to 11g. , the swing center of the end mill 34 is moved from point P ₁ to point P ₂ , and from point P ₂ is moved along the trajectory l to the diameter reduction position P', and at the same time, the rolling roll 11 is rotated by the rotation amount R ₁ . ,
A shallow upward-left nodal groove is machined in the caliber shoulder (right) 9a in the moving machining range θ ₁ from the machining start point a to the machining mode change point b, and then the end mill 34
is swung about the reduced diameter position P′ as a fulcrum, and at the same time, the rolling roll 11 is rotated by a rotation amount R ₂ .
A nodal groove of the required depth is machined in the caliber bottom 9b in the swing machining range θ ₂ from the processing mode change point b to the processing mode change point c, and the swing center of the end mill 34 is set along the trajectory l' At the same time, the rolling roll 11 is rotated by _{the rotation amount R 3 to} move from the machining mode change point c to the machining mode change point d.
Caliber shoulder (left) 9a with moving machining range θ ₃ up to
Machining a shallow knot groove that slopes upward to the left.

Then, move the swing center of the end mill 34 from P ₄ .
While moving to _point P, the rolling roll 11 is rotated by one pitch of the threaded nodal groove 33B, and the above procedure is repeated.

(3) Machining procedure for wavy (V-shaped) nodal groove 33C In the case of V-shaped nodal groove 33C as shown in Figure 15a, machining is performed twice.

(a) First processing step Almost the same as the steps in Figures 11a to 11g,
The swing center of the end mill 34 is moved from point _P1 to point _P2 , and at the same time, the rotation amount of the rolling roll 11 is changed from point _P2 to the diameter reduction position P' along the trajectory l.
Rotate at R ₁ , move from the machining start point a to the machining mode change point b, and machine a shallow nodal groove sloping upward to the left on the caliber shoulder (right) 9a in the machining range θ ₁ . At the same time, the rolling roll 1 is swung counterclockwise using the radial position P' as the fulcrum of swiveling.
1 by rotation amount R ₂ to obtain the swing machining range θ ₂ from machining mode change point b to machining mode change point c.
Then, a nodal groove of the required depth is machined in the bottom part 9b of the caliber upward to the left, and the swing center of the end mill 34 is moved along the trajectory l' to point P ₃ , and at the same time, the rolling roll 11 is rotated by the rotation amount R ₃ . By rotating it, a shallow nodal groove upward to the left is machined in the caliber shoulder (left) 9a within the moving machining range θ ₃ from the machining mode change point c to the machining end point d.

Next, reverse the above procedure to remove the end mill 34.
While moving the center of oscillation from point _P3 to the reduced diameter position P' along the trajectory l', the rolling roll 11 is rotated by the amount of rotation.
Rotate at _R1 ', move from the machining end point d to the machining mode change point c', and machine a shallow upward-sloping knot groove to the right on the caliber shoulder (left) 9a in the machining range θ ₃ . At the same time, the rolling roll 1 is swung clockwise using the reduced diameter position P' as the fulcrum of swiveling.
Rotate 1 by rotation amount R ₂ ′ and change the machining mode.
Swing machining range θ ₂ from c′ to machining mode change point b′
Machining a nodal groove of the required depth upward to the right on the bottom part 9b of the caliber, and then setting the swing center of the end mill 34,
At the same time, move the rolling roll 11 along the trajectory l to point P ₂ , and at the same time move the rolling roll 11 with the rotation amount R ₃ ' from the machining mode change point b _' to the machining start point a. Machining a shallow knot groove.

By repeating the above procedure, a V-shaped first groove is formed in the entire caliber 9.

(b) Second machining process After the first machining process is completed, move the swing center of the end mill 34 to the diameter reduction position P', and move the end mill 34 to the diameter reduction position P'.
4 is set within the swing processing range θ ₂ , and processing mode change points e, f, and g are set within the swing processing range θ ₂ .

Then, the center of the cutting edge of the end mill 34 is set, for example, at the machining mode change point e in the first nodal groove, and the end mill 34 is swung counterclockwise about the diameter reduction position P' as a fulcrum, and at the same time the rolling The roll 11 is rotated by a rotation amount R ₄ , and the first rotation is performed in the swing machining range θ ₄ from the machining mode change point e to the machining mode change point f.
When the cutting edge center of the end mill 34 reaches the machining mode change point f after rapidly moving in the knot groove, the 15th
As shown in Fig. c, the end mill 34 is set so that an arc-shaped nodal groove of the required depth is machined on the caliber bottom 9b in the oscillating machining range θ ₅ between the machining mode change points f and f'. At the same time, the rolling roll 11 is rotated counterclockwise using the diameter reduction position P' as a pivot point.
_R5 , and at the machining mode change point g, the end mill 34 is swung clockwise about the diameter reduction position P' as a fulcrum, and at the same time, the rolling roll 11 is rotated by the amount of rotation.
Rotate with R ₅ ′.

Next, the end mill 34 is swung clockwise about the diameter reduction position P' as a fulcrum, and at the same time, the rolling roll 11 is rotated by the rotation amount _R4 ', and the machining mode is changed from the machining mode change point f'. Rapidly traverse within the first knot groove in the oscillating machining range θ ₄ up to point e'.

By repeating the above procedure, an arc-shaped second knot groove is machined inside the V-shaped first knot groove formed in the first processing step.

When machining the second knot groove, a triangular uncut portion (see hatching) is created between the folded part of the first knot groove and the arc portion of the second knot groove, as shown in Fig. 15b. Therefore, when the center of the cutting edge of the end mill 34 reaches the machining mode change point g, the rotation of the rolling roll 11 is stopped, and the end mill 34 is rotated counterclockwise around the diameter reduction position P' as a pivot point to the machining mode change point g'. The blade is further oscillated until the uncut portion is removed.

Thereafter, the end mill 34 is swung clockwise around the reduced diameter position P' as a fulcrum, and the above-described machining process is continued.

(4) Machining procedure for wavy (U-shaped) knot groove 33D In the case of a U-shaped knot groove 33D as shown in Fig. 16, machining is performed twice.

(a) First processing step Almost the same as the steps in Figures 11a to 11g,
The pivoting center of the end mill 34 is moved to the diameter reduction position P', and a machining mode change point g is set within the moving machining range θ ₁ , θ ₃ of the end mill 34 .

Then, the center of the cutting edge of the end mill 34 is set to, for example, the machining mode change point b, and the end mill 34
is oscillated counterclockwise about the diameter reduction position P' as a fulcrum, and at the same time, the rolling roll 11 is rotated by a rotation amount R ₆ to perform oscillating machining from machining mode change point b to machining mode change point c. Caliber bottom 9b in range θ ₂
Machining a nodal groove of the required depth upward to the left, then
The center of the cutting edge of the end mill 34 is the machining mode change point f
When this point is reached, a shallow arc-shaped nodal groove is machined in the caliber shoulder (left) 9a in the oscillating machining range θ ₅ between the mode change points c and c', as in the case of Fig. 15c. At the same time, the center of oscillation of the end mill 34 is moved along the locus l' to the front of point _P3 , and at the same time, the rolling roll 11
Rotate with rotation amount R ₇ , and at machining mode change point g,
The center of oscillation of the end mill 34 is at the reduced diameter position along the locus l'.
At the same time as moving it to P', rotate the rolling roll 11 by the amount of rotation R ₇ ' to remove the caliber shoulder (left) 9a.
Further, the end mill 34 is swung clockwise around the diameter reduction position P' as a fulcrum, and at the same time, the rolling roll 11 is rotated by an amount of rotation.
Rotate at _R6 ' to machine a nodal groove of the required depth upward to the right in the caliber bottom 9b in the oscillating machining range _θ2 from the machining mode change point c' to the machining mode change point b'.

By repeating the above procedure, a U-shaped first groove is formed in the entire caliber 9.

(b) Second machining process After the first machining process is completed, the swing center of the end mill 34 is moved from point _P2 to the diameter reduction position P' along the trajectory l, and at the same time, the rolling roll 11 is rotated by the rotation amount _R8 . Rotate and move the caliber shoulder (right) 9 in the machining range θ ₁ from the machining start point a to the machining mode change point b.
A shallow nodal groove is machined upward to the left, and then the end mill 34 is swung counterclockwise about the diameter reduction position P' as a fulcrum, and at the same time, the rolling roll 11 is rotated at a rotation amount R ₉ . Rapidly traverse the first nodal groove in the oscillating machining range θ ₆ from the machining mode change point b to the machining mode change point c, and then, when the center of the cutting edge of the end mill 34 reaches the machining mode change point c, the end mill 34 oscillates. Moving the dynamic center from the diameter reduction position P' to point _P3 on the trajectory l', and simultaneously rotating the rolling roll 11 with a rotation amount _R10 , moves from the machining mode change point c to the machining end point d. In the range θ ₃ , a shallow upward-left nodal groove is machined on the caliber shoulder (left) 9a, and then the end mill 34 is stopped from swinging from the processing mode change point d to the processing mode change point d', and the rolling roll 11 is Rotate with a rotation amount of R ₁₁ to machine a shallow knot groove in the circumferential direction on the caliber shoulder (left) 9a.

The center of the cutting edge of end mill 34 is the point where the machining mode changes.
When reaching point d', the swing center of the end mill 34 is moved along the trajectory l' from point _P3 to the diameter reduction position P', and at the same time, the rolling roll 11 is rotated by the rotation amount _R10 ', and the machining mode is changed. Machining mode change point from change point d′
Caliber shoulder (left) 9 at movement machining range θ ₃ to c′
A shallow nodal groove is machined upward to the right, and then the end mill 34 is swung clockwise about the diameter reduction position P' as a fulcrum, and at the same time, the rolling roll 11 is rotated at a rotation amount _R9 '. , rapid traverse is performed within the first joint groove in the moving machining range θ ₆ from the machining mode change point c' to the machining mode change point b'.

By machining the second knot groove, an arcuate uncut portion is generated outside the arc portion of the first knot groove in the first machining step, so the uncut portion is cut out.

[Brief explanation of the drawing]

Fig. 1 is an overall plan view of the knot groove machining device according to the present invention, Fig. 2 is a front view of Fig. 1, Fig. 3 is a left side view of Fig. 2, and Fig. 4 is a rear view of Fig. 2. , FIG. 5 is a plan view of the main part of FIG. 2, FIG. 6 a and FIG. 6 b are front views showing examples of knot grooves, FIG. 7 is a plan sectional view of the rocking table, and FIG. 8 is a plan view of the rocking table. Fig. 7 is a front sectional view, Fig. 9 is a front sectional view of the head, Fig. 10 is a plan view showing the relationship between the swinging of the end mill and the locus of movement, and Figs. 11a to 11g are the swinging of the end mill. FIGS. 12a to 12c are side views showing how to set the extension amount of the end mill;
Figure 3 is a front view of a parallel joint groove, Figure 14 is a front view of a threaded joint groove, Figure 15a is a front view of a V-shaped joint groove, and Figure 15b shows how to remove the uncut portion. FIG. 15c is a front view showing the procedure for machining the arcuate portion, and FIG. 16 is a front view of the U-shaped knot groove. 9... Caliber, 9a... Shoulder, 9b... Bottom, 11... Roll, 12... Base, 21...
... Parallel movement table, 26 ... Right angle movement table, 29 ... Rocking table, 33A, B, C, D ... Node groove, 34 ... End mill, 66 ... Control device, P ... Caliber center, P' ...Reduced diameter position.

Claims (1)

[Scope of Claims] 1. A method of machining knot grooves in the caliber of a rolling roll using an end mill, the method including the rolling roll shaft with the end mill pivoting at a reduced diameter position inward from the center of the caliber. A process of machining a knot groove on the bottom of the caliber while swinging the end mill within an angle range in which the rear part does not contact the shoulder of the caliber in a plane, and tilting the end mill at a predetermined angle in which the rear part does not contact the shoulder of the caliber in the plane. machining a nodal groove shallower than the nodal groove at the bottom of the caliber in the shoulder of the caliber while moving the pivoting center of the end mill in a predetermined trajectory with respect to the diameter reduction position while the end mill is held in the same state; A method for processing knot grooves in a rolling roll, characterized by comprising the steps of: 2 A method of machining knot grooves in the caliber of a rolling roll using an end mill, in which the swinging center of the end mill is set at a reduced diameter position inward from the center of the caliber, and the rear part of the caliber is set in a plane containing the rolling roll axis. A process of machining a knot groove on the bottom of the caliber while swinging the end mill within an angle range that does not contact the shoulder, and a process of holding the end mill tilted at a predetermined angle where the rear part does not contact the shoulder of the caliber within the above plane. , a step of machining a nodal groove shallower than a nodal groove on the bottom of the caliber in the shoulder of the caliber while moving the pivoting center of the end mill along a predetermined trajectory relative to the diameter reduction position, and synchronizing with each of the above steps. and rotating the roll.