JPH0555245B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method of reworking knot grooves in a 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.

From this point of view, instead of the above electric discharge machining method,
A knot groove machining method has been proposed in which a knot groove is machined by rotating a cutting tool around the center of the caliber (for example, Japanese Patent Laid-Open No. 56-56317, Jikkosho
(See Publication No. 59-9777). However, the above machining method is pitch-based groove machining, and when re-grinding a roll on which a V-shaped groove has been formed, the roll must be ground until it is equal to an integral multiple of the groove pitch. There is a problem that the amount of grinding increases and it becomes difficult to process the roll again.

By the way, in view of the various problems with the conventional machining method, the present applicant has previously created not only parallel knot grooves but also corrugated and screw-shaped knot grooves in the caliber of a rolling roll using an end mill. We have proposed a method for machining grooves on rolling rolls that enables accurate and rapid machining of rolls, etc. (Japanese Patent Application No. 60-78044)
61-236413)).

(Object of the Invention) The basic object of the present invention is to provide a knot groove reworking method that can minimize the amount of regrinding of a roll when reworking the knot grooves, and to achieve this objective, the present invention has been developed. The knot groove processing method, which is the applicant's earlier application, is utilized.

(Structure of the Invention) That is, the present invention provides, in a rolling roll formed by machining knot grooves in the caliber on an angle basis, when reworking the knot grooves in the caliber, The process of cutting the outer diameter of the roll to reduce its diameter and cutting the caliber to a predetermined depth, and the process of moving the end mill back and forth, left and right, and horizontally in a plane containing the axis of the roll with respect to the roll. This method is characterized by the step of reworking new knot grooves in the caliber of the rolling roll along the previous knot grooves while rocking.

(Effects of the Invention) According to the present invention, the outer diameter of the roll is reduced by cutting at a depth that is a fraction of the depth of the nodal groove, and after cutting the caliber to a predetermined depth, the end mill is used to New knot grooves are re-machined into the caliber of the rolling roll along the previous knot grooves, so it is necessary to completely remove the previous knot grooves using electrical discharge machining methods or conventional machining methods. Therefore, the amount of cutting is large, and the number of reworks is limited to one time when the steel bar size is large.In contrast, with this method, the amount of cutting is small, so the number of reworks is greatly increased, and the number of reworks is limited to one time. It can be used over and over again, significantly reducing roll costs.

(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
means a tightening fitting 17 that clamps the parallel part that connects to the coupling of the drive shaft, which is cut into the end of the roll shaft.
(see Figure 4), and the main shaft motor 1
8, the main shaft 13 rotates the rolling roll 1.
1 is rotated at a predetermined speed.

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

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 table portion 25 extending perpendicularly to the rolling roll 11 is formed on the parallel moving table 21, and a rectangular moving table 26 is supported on the table portion 25 so as to be able to reciprocate in the direction perpendicular to the rolling roll 11. has been done.

The orthogonal moving table 26 is connected to a screw shaft (not shown) that is driven by a orthogonal moving motor 27 installed at the bottom 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.

The end mill 34 is provided with a chamfered portion (see FIG. 10) 34a at the cutting edge so that groove processing and chamfering can be performed simultaneously.

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 swinging table 29 has a center hole 29a at the front end fitted into the swinging shaft 28, and a hook 29b at the rear lower part engaged with the outer circumferential groove 26a of the right-angle moving table 26. The upper part is slid horizontally 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 through 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 2 is arranged so that the end mill 34 oscillates around 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.
A circuit device A for controlling the swing angle of the caliber 9 and a swing center of the end mill 34 are arranged parallel to the right angle moving table 26 so that the swing center of the end mill 34 moves along predetermined trajectories l and l' with respect to the center P of the caliber 9. A circuit device B that controls the relative movement amount of the moving table 21 and a rotation angle R 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 (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 swings around the center P of the caliber 9.
When the end mill 34 is oscillated with the radius r set to cut into the inner circumferential surface of the caliber to a predetermined depth, in the angle range (oscillation machining range) θ ₂ in which the rear part of the end mill 34 does not contact the caliber shoulder 9a, Node grooves 33 can be formed in the caliber bottom 9b.

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 rocking 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 in an arc from point P ₂ to the caliber center P,
The center of the cutting edge of the end mill 34 moves within a moving machining range θ ₁ from the machining start point a to the machining mode change point b, and a knot groove 33 is machined in the right caliber shoulder 9a.

In FIGS. 11 d to 11 e, the rocking table 29
When the end mill 34 is swung to the left and the end mill 34 is swung around the caliber center P as the fulcrum, the center of the cutting edge of the end mill 34 is in the swiveling machining range θ ₂ from the machining mode change point b to the machining mode change point c. Move and
Node grooves 33 are 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 X ₂ , and the swing center of the end mill 34 is moved from the caliber center P to the P ₃ point (end position) along the trajectory l', the center of the cutting edge of the end mill 34 is moved within a moving machining range θ ₃ from the machining mode change point c to the machining end change point d, and a knot groove 33 is machined in the left caliber shoulder portion 9a.

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.

FIG. 11a to FIG. 11b show the parallel joint groove 33A.
This shows the procedure for machining threaded joint groove 33.
B. Processing of the corrugated knot grooves 33C and 33D is based on the processing procedure for the parallel knot groove 33A, and the rolling roll 1
1 by rotating them synchronously. 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 align the cutting edge of the end mill 34 with the caliber center P, and then
As shown in FIG. 12c, when the end mill 34 is advanced to the caliber radius r (see FIG. 10), the swing center of the end mill 34 coincides with the caliber center P.

Next, first, the processing procedure 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 _P1 to point _P2 , move from point _P2 to the caliber center P along the trajectory l, and move from the machining start point a to the machining mode change point b
Caliber shoulder (right) 9a with movement machining range θ ₁ up to
Then, the end mill 34 is oscillated about the caliber center P as the oscillating center, and the end mill 34 is oscillated around the caliber center P to the caliber bottom 9b in the oscillating machining range θ ₂ from the machining mode change point b to the machining mode change point c. After machining the knot groove, the center of oscillation of the end mill 34 is set to the trajectory.
l' to point _P3 , and machine a knot groove in the shoulder (left) _9a of the caliber within the moving machining range θ3 from the machining mode change point c 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) Machining procedure for wavy (V-shaped) nodal groove 33C In the case of V-shaped nodal groove 33C as shown in Figure 14a, machining is performed twice.

(a) First processing step Almost the same as the steps in Figures 11a to 11g,
Move the swing center of the end mill 34 from point P ₁ to point P ₂ , and move the caliber center P from point P ₂ along the trajectory l.
At the same time, the rolling roll 11 is rotated by a rotation amount R ₁ to create a left-sloping nodal groove 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. is processed, and then,
The end mill 34 is swung counterclockwise about the caliber center P as a fulcrum, and at the same time, the rolling roll 1
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.
Machining a nodal groove upward to the left on the bottom part 9b of the caliber,
Furthermore, the center of oscillation of the end mill 34 is set at the locus l'.
At the same time as moving up to point _P3 , rolling roll 11
Rotate by rotation amount R ₃ and change the machining mode c
A nodal groove upward to the left is machined on the caliber shoulder (left) 9a in the moving machining range θ ₃ from 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 center of caliber P along the locus 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', machine a right-sloping knot groove in the caliber shoulder (left) _9a in the machining range θ3, and then,
The end mill 34 is swung clockwise about the caliber center P as a fulcrum, and at the same time the rolling roll 1
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 knot groove upward to the right on the bottom part 9b of the caliber,
Furthermore, the center of oscillation of the end mill 34 is set at the locus l.
At the same time as moving to point _P2 , rolling roll 11
Move from machining mode change point b' to machining start point a with rotation amount R ₃ '. Caliber shoulder (right) with machining range θ ₁ .
Machining a nodal groove upward to the right in 9a.

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 oscillation center of the end mill 34 to the caliber center P, set the oscillation of the end mill 34 within the oscillation machining range θ ₂ , and oscillate Machining mode change points e, f, g within the machining range θ ₂
Set.

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 caliber center P as a fulcrum, and at the same time, the rolling roll 11
Rotate by rotation amount R ₄ and change the machining mode e
Rapidly traverse the first joint groove in the swing machining range θ ₄ from to the machining mode change point f, and then move the end mill 34
When the center of the cutting edge reaches the machining mode change point f, as shown in Fig. 14c, the machining mode change point f,
The end mill 34 is set so that an arc-shaped nodal groove is machined on the caliber bottom 9b in the swing machining range θ ₅ between f′.
is swung counterclockwise about the caliber center P as a fulcrum, and at the same time, the rolling roll 11 is rotated by a rotation amount R ₅
At the machining mode change point g, the end mill 34 is swung clockwise about the caliber center P as a fulcrum, and at the same time the rolling roll 11 is rotated by the rotation amount.
Rotate with R ₅ ′.

Next, move the end mill 34 to the caliber center P.
At the same time, rotate clockwise using
The rolling roll 11 is rotated by a rotation amount R ₄ ′, and is rapidly fed in the first nodal groove in an oscillating processing range θ ₄ from the processing mode change point f′ to the processing mode change 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 this 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. 14b. 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 further rotated counterclockwise around the caliber center P as a swinging fulcrum until the machining mode change point g'. It is oscillated to cut out the uncut portion.

Thereafter, the end mill 34 is swung clockwise around the caliber center P as a fulcrum, and the above-described machining process is continued.

On the other hand, when the various nodal grooves 33A to 33C machined in the caliber 9 of the rolling roll 11 are worn out, it is necessary to rework the nodal grooves 33A to 33C in the caliber 9.

In this case, as shown in the quadrant of FIG. 15, the new diameter of the rolling roll 11 corresponding to the pitch F of the knot grooves 33A to 33C, for example 20, is set to D, and the pitch F' of the knot grooves 33A to C corresponds to, for example, 19. Assuming that the machining diameter of the rolling roll 11 is D′ and the abrasion diameter is D″, in the conventional electrical discharge machining method, as shown in the fourth quadrant and FIG.
Since it is necessary to completely remove the first knot groove 33 machined with the pitch F on the rolling roll 11 of the newly manufactured diameter D (for example, the roll diameter is 25 to 30 mm), reworking is required once, that is, the machined diameter After cutting to D', only the second machining is possible at pitch F'.

On the other hand, in this method using an end mill,
As shown in the quadrant of FIG. 15 and FIG. 16a, the outer diameter of the rolling roll 11 is cut to a depth that is a fraction of the depth of the first nodal groove 33 (for example, 5 mm in roll diameter). At the same time, the caliber 9 is cut to a predetermined depth, and a new knot groove 33 is reprocessed (second time) in the caliber 9 along the knot groove 33 that remains after cutting.

Similarly, reprocessing can be performed a third or fourth time.

The number of times this machining is performed is as follows:
The outer diameter of the nodal groove 3 is reduced as shown in Fig. 16b.
Since the pitch F of No. 3 gradually narrows, the pitch is set to F'' within the allowable limit.

If the nodal grooves 33A to 33C are worn out at a pitch F' within this allowable limit, the outer diameter of the rolling roll 11 is cut to the working diameter D' as shown in the first quadrant of FIG. Machining the fifth nodal groove 33 at pitch F'.

Then, in the same manner as described above, reprocessing can be performed for the 6th to 8th time until the wear diameter D'' is reached.

This number of processes is also set within the allowable limit of pitch F in the same manner as described above.

In this way, with the conventional electrical discharge machining method, machining could only be performed twice, but with this method, machining can be performed eight times, quadrupling the number of reuses and reducing roll costs by 1/2. Now reduced to 4.

In each of the above embodiments, all of the knot groove re-machining methods were performed using a mechanical cutting method, but the first time may be a knot groove re-machining method using an electrical discharge machining method.

Furthermore, it goes without saying that the present invention can also be applied to the "knot" processing method, which was the "knot groove" processing method in each of the above embodiments.

[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 14a is a front view of a V-shaped joint groove, Figure 14b is a front view showing how to remove the uncut portion, and Figure 14c is a front view of a circular arc section. 15 is a front view of the rolling roll showing the cutting procedure, FIG. 16a is a side view showing the groove machining procedure, FIG. 16b is a plan view of FIG. 16a,
FIG. 17 is a side view showing a groove machining procedure using the electrical discharge machining method. 9...Caliber, 11...Rolling roll, 12...
... Base, 21 ... Parallel movement table, 26 ... Right angle movement table, 29 ... Rocking table, 33A, B, C ... Nodal groove,
34... End mill, 66... Control device.

Claims (1)

[Scope of Claims] 1. In a rolling roll formed by machining nodal grooves in the caliber on an angular basis, when reworking the nodal grooves of the caliber, A process of cutting the outer periphery to reduce the diameter and cutting the caliber to a predetermined depth, and moving the end mill back and forth, left and right, and horizontally in a plane including the axis of the roll with respect to the roll. A method for reworking knot grooves in a roll, comprising the step of reworking new knot grooves in the caliber of the roll along the previous knot grooves.