JP5353142B2 - Automatic phase adjustment rolling machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatically phase-adjusting rolling machine with which the amount of phase correction is easily calibrated without necessitating the design change of the attaching position of a displacement sensor in accordance with the different length and shape in the axial direction of a material to be rolled, in which disturbance is hard to enter and which has high reliability. <P>SOLUTION: This machine has an NC phase correcting means in which: a force sensor 23 with which a force in the advancing direction of flat dies, which is loaded on a material 11 to be rolled during form rolling is detected is arranged in a supporting center attaching part 27 where attachable and detachable supporting center members 15, 16 are attached; the amount of deviation from the point-symmetrical positional relationship to the axial center 111 of the material 11 to be rolled of the flat die is calculated from the detected value of the force sensor 23; a second servomotor is driven by NC command so as to eliminate the amount of deviation from the point-symmetrical positional relationship to the axial center 111 of the material 11 to be rolled of a pair of the flat dies and the relative position of the other side to one side of the pair of the flat dies is corrected by rotating a pair of rotary plates. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an automatic phase adjusting rolling machine with improved processing accuracy of a flat die rolling machine.

A pair of flat dies are arranged in parallel to the symmetrical position, and the product to be rotated is supported between the flat dies in a rotatable manner, and is sandwiched between the flat dies. When plastic working an involute spline or the like, it is necessary to synchronize the flat dies so that they are point-symmetric with respect to the center of rotation of the workpiece as accurately as possible. It has been found that if this synchronization accuracy is lost, the accumulated pitch error of the involute spline of the machined workpiece becomes worse. As a rolling machine that controls the phase of a pair of dies so as to be point-symmetric with respect to the center of rotation of the workpiece, in Patent Document 1, as shown in FIG. The displacement sensor 119 is fixedly held on the support frame 117 on the rear side, and the amount of displacement of the rolled material caused by the phase difference of the dies during the rolling process is detected, and the distance between the pair of rolling tools is detected from this displacement signal. An automatic phase adjusting rolling machine that changes the drive speed of a servo motor so as to eliminate the phase difference is disclosed (Patent Document 1, column 4, bottom 5 to 3).
Japanese Patent No. 2800132

  However, in the rolling machine described in Patent Document 1, it is assumed that the rear center member 114 and the front center member 113 indicated by oblique lines are the same regardless of the product to be rolled 118. In the flat die rolling machine, the rear center member 114 and the front center member 113 are connected to the rear center mounting portion 120 according to the axial length and shape of the article 118 to be rolled. The center member 113 was attached to the front center member mounting portion 121 with different axial lengths and shapes so as to be replaceable. For this reason, the displacement sensor 119 detects the amount of displacement of the rolled material caused by the phase difference of the dies during the rolling process because the mounting position of the displacement sensor 119 changes depending on the different axial length and shape of the rolled material 118. However, phase correction is difficult, and the displacement amount at the displacement sensor mounting position and the displacement amount at the machining position of the rolled article 118 do not match, which makes it difficult to calibrate the displacement sensor. There was a problem that it was vibrated and disturbance was easily introduced.

  The object of the present invention is to solve the above-mentioned problems, and without changing the design of the mounting position of the displacement sensor due to the different axial length and shape of the rolled product, the amount of displacement at the mounting position of the displacement sensor and the An object of the present invention is to provide a highly reliable automatic phase adjusting rolling machine that can automatically calibrate the phase correction amount by making the displacement amount at the machining position of the structure coincide with each other and can easily calibrate the phase correction amount.

Therefore, in the present invention, a pair of flat dies are arranged in parallel to the product to be rolled, the product to be rolled is supported between the flat dies in a rotatable manner between the support centers, and sandwiched between the flat dies. A rolling machine for rolling involute splines or gears on the outer periphery of a rolled product,
A force sensor capable of detecting the force in the direction of flat die movement applied to the workpiece during rolling is disposed in the support center mounting portion to which the detachable support center member is attached, and calibration of the force sensor and the right and left flat die initial stage In the phase alignment operation, a deviation amount calculating means for receiving a signal from the force sensor and converting the deviation of the pair of flat dies from the point-symmetrical position with respect to the rolled product, and the first amount so as to eliminate the deviation amount. NC phase correcting means capable of correcting the other relative phase position of one of the pair of flat dies with an NC command, wherein the force sensor is a strain gauge or a piezoelectric strain sensor, and the force sensor is connected to the support center mounting portion. In addition, the output a of the force sensor when the rolling processing is performed in the state of the initial phase difference A of the pair of flat dies is stored symmetrically with respect to the axis of the workpiece. Next, a command is given to the NC phase correcting means to store the output b of the force sensor when the rolling process is performed in the state B in which the initial phase difference between a pair of flat dies is shifted by X, and the sensor output From the level difference between a and b and the phase difference X of the flat die, the calibration value of the force sensor, that is, the flat die initial phase difference correction amount A (A = X (b−a)) per unit sensor output is obtained. By giving an initial phase correction amount Z to the NC phase correction means so that the output of the force sensor is equivalent to the output when the initial phase difference of the pair of flat dies is zero, the initial phase difference of the pair of flat dies The above-described problems of the present invention have been solved by providing an automatic phase adjusting rolling machine characterized in that is made close to zero . That is, paying attention to the fact that the signal level from the force sensor correlates with the phase shift amount of the left and right flat dies, the phase shift amount of the right and left flat dies is calculated from the output value of the force sensor, and the position of the flat die is calculated. The correction amount is obtained.

  With this configuration, in the present invention, the displacement sensor is not fixedly held to the support frame on the rear side so as to approach the upper part of the front center portion of the rear center member. A force sensor capable of detecting the force of the pair is disposed at a support center mounting portion to which a detachable support center member is attached, receives a signal from the force sensor, and from a point symmetrical position with respect to the roll of the pair of flat dies. Since there is provided a deviation amount calculation means for converting to a deviation amount and an NC phase correction means capable of correcting the other relative phase position of one of the pair of flat dies with an NC command so as to eliminate the deviation amount. Due to the different axial length and shape of the rolled product, it is not necessary to change the design of the mounting position of the displacement sensor, the amount of displacement at the mounting position of the displacement sensor and the processing position of the rolled product By matching the amount of displacement, it can be easily calibrated automatically phase correction amount, was intended to provide a disturbance enters hardly reliable automatic phase adjusting rolling machine.

Preferably, the force sensor may be a strain gauge sensor if a lower cost system is desired, but a commercially available quartz piezoelectric strain sensor has high sensitivity and is easy to install and replace.
In addition, when the force sensor is provided vertically on the support center mounting portion so as to be symmetrical with respect to the axis of the article to be rolled, when the end of the spline is cut off, the force in the workpiece axis direction can be increased by rolling. In the case of occurrence, the force sensor may be provided on the support center mounting part vertically above and below the axis of the article to be rolled. In other words, when the initial phase correction amount is given to the NC phase correction means so that the initial phase difference between the pair of flat dies approaches zero, the force sensor output when the initial phase difference between the pair of flat dies is zero is zero. If it is convenient, rolling processing is performed by taking the difference between the outputs of the two force sensors provided vertically at the support center mounting portion and symmetrically with respect to the axis of the product to be rolled. Even when a force in the direction of the axis of the roll is generated by the force, the force sensor output value when the initial phase difference between the pair of flat dies is zero can be made zero. The initial phase correction amount Z can be easily obtained.

More preferably, the output a of the force sensor when the rolling process is performed in the state of the initial phase difference A of a pair of flat dies is stored, and then a command is given to the NC phase correcting means to generate a pair of flat dies. The output b of the force sensor when the rolling process is performed in the state B in which the initial phase difference of the die is shifted by X is stored, and the force difference between the level of the force sensor outputs a and b and the phase difference X of the flat die When the calibration value of the sensor, that is, the flat die initial phase difference correction amount A (A = X (b−a)) per unit sensor output is obtained, and the output of the force sensor is the initial phase difference of a pair of flat dies is zero By giving an initial phase correction amount Z to the NC phase correction means so as to be equal to the output of the above, the initial phase difference between a pair of flat dies is made close to zero.
More preferably, after the initial phase correction amount Z is given, the output of the force sensor to which the initial phase correction amount Z is given is A / D converted and captured in the finish rolling process section, and the initial phase correction amount Z is obtained. When the average value c of the force data in the finishing tooth section after applying the initial value is stored, and then the average value c of the force sensor after applying the initial phase correction amount Z exceeds a predetermined limit value The average value c of the force sensor after giving the initial phase correction amount Z, that is, the phase correction value Y ′ of the left and right dies for making the relative phase difference between the left and right dies zero, Y = −A * b Then, Y ′ = − A * c is calculated, and Y ′ is added to the initial phase correction value Z (cumulative) for the subsequent rolling process of the rolled product. Move on to rolling of structures.

An automatic phase adjusting rolling machine according to an embodiment of the present invention will be described with reference to FIGS. 1 is a block diagram showing a front view of an automatic phase adjusting rolling machine according to an embodiment of the present invention, FIG. 2 is a right side view seen from a plane parallel to the axis 111 of the article 11 to be rolled in FIG. a) shows the mounting state of the rolled product 11 of FIG. 2, (b) to (e) show the mounting state of a different type of rolled product from the rolled product of FIG. 2, and FIG. 5 is a control block diagram of the automatic phase adjusting rolling machine, FIG. 5 is a flow chart showing the calibration of the strain sensor 23 in FIG. 2 and a right and left dice initial phase matching program, and FIG. 6 is an initial view of the strain sensor 23 by the flow chart in FIG. FIG. 7 is a flow chart showing a left and right die rolling process and a phase correction program after the distortion sensor is calibrated by giving the phase correction value Z (cumulative). FIG. 7 is a flow chart of FIG. work stage of the dice initial phase Align oPERATION FIG. 8 is an explanatory diagram showing the processing, and FIG. 8 is a work stage of left and right die rolling processing and phase correction by the flow chart of FIG. 6 using a strain sensor calibrated by giving an initial phase correction value Z (cumulative) to the strain sensor 23. FIG. 9 is an explanatory diagram for calculating the deviation amount of the pair of flat dies shown in FIG. 1 from the point symmetrical position with respect to the axis of the article to be rolled, and FIG. 10 is an A- of the gear box 2 in FIG. FIG. 11 is a cross-sectional view taken along line A, and FIG.

  As shown in FIG. 1, the automatic phase adjusting rolling machine according to the embodiment of the present invention places a pair of flat dies 9, 11 of the rolling machine body 1 in a point-symmetrical position with respect to the axis 111 of the rolled product 11. The rolls 11 are arranged in parallel and supported between the flat dies 9 and 10 so as to be rotatable between the support dies 15 and 16 shown in FIG. 1 is driven by a pair of ball screw shafts 3 and 4 which are supported by bearings so that the flat dies 9 and 10 are relatively synchronously moved to plastically process an involute spline or gear (not shown) on the outer periphery of the roll 11. This is a flat die rolling machine.

As shown in FIGS. 1 and 3A, the automatic phase adjusting rolling machine according to the embodiment of the present invention is a force sensor 23 that can detect the force in the direction in which the flat die proceeds on the workpiece 11 during the rolling process. Is disposed in a support center mounting portion 27 to which the detachable support center members 15 and 16 are attached. In calibration and left Migihirada chair 9,10 initial phasing operations of the distortion sensor 23 is a force sensor, the detected value of the distortion sensor 23, from the current position of the sliding table 7, 8, 9, flat dies The figure which calculates the shift | offset | difference (cb) from the point symmetry positional relationship with respect to the shaft center 111 of 9,10 to-be-rolled products 11, and converts into the shift | offset | difference from the point symmetrical position with respect to the to-be-rolled product of a pair of flat dies. Any amount calculation means not shown and the second servo motor 13 is driven by the NC command to drive the seventh gear 47 so as to eliminate the deviation amount, the pair of rotary plates 20 and 21 are rotated, The relative meshing phase of the sixth gear 46 and the second gear 42 fixed to the other 4 of the pair of ball screw shafts is changed to correct the relative phase position of the other 9 relative to the one 10 of the pair of flat dies. Possible NC phase correction means (not shown) A. Details of the NC phase correcting means are disclosed in Japanese Patent Application No. 2008-232047 that has been filed by the applicant.

In general, the NC phase correcting means includes a pair of ball screw shafts 3 in the gear box 2 of the rolling machine body 1 as shown in FIG. 10 which is a cross-sectional view taken along line AA of the gear box 2 in FIG. 4, a first gear 41 and a second gear 42 are fixed to each other, and a third gear 43 that meshes with the first gear 41 fixed to one of a pair of ball screw shafts 3 is a drive shaft thereof. The first servo motor 12 fixed to 5 and the third gear 43 are arranged in series so as to be rotatable on the drive shaft 5 of the first servo motor 12 and mesh with the second gear 42. A fourth gear 44 is provided. An intermediate shaft 19 rotatably supported by a pair of rotary plates 20 and 21 rotatably supported by the drive shaft 5 around the drive shaft 5, and a fourth shaft rotatably supported by the intermediate shaft 19 and the fourth. A fifth gear 45 that meshes with the gear 44 , a sixth gear 46 that is rotatably supported by the intermediate shaft 19, is fixed or integrated with the fifth gear 45, and meshes with the third gear 43, and a pair of rotations Rack teeth 48 provided on the outer periphery of at least one of the plates 20 and a second servo motor 13 that is rotatably supported by the gear box 2 and drives a seventh gear 47 that meshes with the rack teeth 48 are provided. By rotating the second servo motor 13 by a predetermined amount, the pair of rotary plates 20 and 21 are rotated by a predetermined amount around the drive shaft 5 of the first servo motor 12, and an appropriate command can be obtained. The second servo motor 13 by value The intermediate shaft 19 is rotated about the drive shaft 5 by a predetermined amount to shift the rotational phases of the left and right ball screw shafts 3 and 4 to correct the positional deviation of the left and right dies 9 and 10. Can be positioned symmetrically with respect to the axis 11 of the rolled product 11.

FIG. 3 (a) shows the mounting state of the rolled product 11 of FIG. 2, and FIGS. 3 (b) to (e) show the mounting state of a different type of rolled product from the rolled product 11 of FIG. 3 (b) is a force sensor that is supported by a left-side support center member 22 indicated by a detachable oblique line having a shaft-shaped portion 24 attached to a shaft and having a long axial direction. The strain sensor 23 is attached to the support center attaching portion 27. FIGS. 3D and 3E are modifications of the support center mounting portion for mounting the strain sensor 23. In FIG. 3D, the strain sensor 23 is mounted on the support center mounting portion main body 28 of FIG. In FIG. 3 (e), the strain sensor 23 is attached to the right support center attachment portion main body 29 by being supported by the right support center member 16 indicated by oblique lines.
What is important here is that there is no need to change the design of the mounting position of the displacement sensor due to the different axial lengths and shapes of the rolls. For this reason, if it has the calibration means of an appropriate force sensor, it can respond flexibly to various kinds of rolled articles of different axial lengths and shapes.

[Effects of the embodiment of the present invention] With this configuration, in the embodiment of the present invention, the displacement sensor is not fixedly held on the rear support frame so as to approach the upper end of the rear center member, but is rolled. A force sensor capable of detecting the force in the direction of travel of the flat die applied to the workpiece during processing is disposed in a support center mounting portion to which a detachable support center member is attached, and receives a signal from the force sensor, Deviation amount calculation means for converting the deviation amount of the flat die from the point-symmetrical position with respect to the workpiece, and the relative phase position of the other of the pair of flat dies relative to one of the pair of flat dies can be corrected by an NC command so as to eliminate the deviation amount. Because it has NC phase correction means, the design of the mounting position of the displacement sensor is not required due to the different axial length and shape of the rolled product. The phase displacement amount can be automatically calibrated automatically by matching the displacement amount at the machining position with the displacement amount at the processing position of the workpiece, providing a highly reliable automatic phase adjustment rolling machine that is less susceptible to disturbance. It became something to do.

Preferably, the force sensor is a strain gauge sensor when a lower cost system is desired, but a commercially available quartz piezoelectric strain sensor has high sensitivity and is easy to install and replace.
In addition, as shown in FIG. 3C, when a force in the axial direction of the workpiece is generated by rolling, such as when the end of the spline is cut off, the strain sensors 23 and 23 ′ are What is necessary is just to make it provide in the support center attaching part 27 symmetrically with respect to the to-be-rolled product axis line 111 up and down. In other words, when the initial phase correction amount is given to the NC phase correction means so that the initial phase difference between the pair of flat dies approaches zero, the force sensor output when the initial phase difference between the pair of flat dies is zero is zero. If it is convenient, the difference between the outputs of the two strain sensors 23, 23 'provided at the support center mounting portion symmetrically up and down with respect to the axis of the workpiece 111 is taken as the strain sensor output value. Thus, even if a force in the axial direction of the workpiece is generated by rolling, the strain sensor output value when the initial phase difference of a pair of flat dies is zero can be made zero. The initial phase correction amount given to the phase correction means can be easily obtained.

  FIG. 4 shows a control block diagram of the automatic phase adjusting rolling machine of this embodiment. The flat die drive servomotor 12 operates in response to a command from a CNC device (not shown), and the left and right flat dies 9, 10 operate mechanically in synchronization. In the present embodiment, the first servo motor 12 is used, but it is not always necessary to be a servo motor. The second servo motor 13 for adjusting the die phase operates in accordance with an NC command from a CNC device (not shown), and accurately gives a phase difference corresponding to the command value to the left and right flat dies 9 and 10. The strain sensor signal is taken into the CNC device through A / D conversion, and the strain sensor calibration is performed by the strain sensor calibration and the die initial phase matching program. At the same time, the initial phase difference between the left and right dies becomes zero. An initial phase correction value is acquired. Further, the strain sensor signal is monitored in the continuous processing by the rolling processing and phase confirmation correction program, and the phase correction of the right and left dies is performed as necessary.

Figure 5 is calibrated and the left and right dies initial phasing flow chart showing an example of a program, according to the flow chart of FIG. 7 is 5, calibration and right dies initial phase Align OPERATION distortion sensor 23 of the strain sensor 23 of FIG. 2 Explanatory drawing which shows the work setup of is shown. In FIG. 5, after the workpiece 11 is rotatably supported between the support centers 15 and 16, the strain sensor 23 is reset to zero before starting rolling in step 50, and the die phase correction value is zero in step 51. After resetting, processing is started in step 52. In step 53, as shown in FIG. 7, the output 29 of the strain sensor 23 during the finish rolling process in the finish rolling process section 30 is A / D converted and captured, and the average value a of the strain data is stored. In step 54, the left and right dies are once stopped at the position of the relief teeth of the left and right dies. Thereafter, in step 55, the left and right dies are moved back to the original position (rack return) in the finish rolling section of the left and right dies, and then in step 56, the phase difference X is given by the NC command from the CNC device. In step 57, the second servomotor 13 for adjusting the left and right die phases is operated, and the left and right dies are moved again from the position of the relief tooth portion (in the same direction and distance as the finish rolling processing section 30) to the finish rolling processing section 32. Just move forward. Next, at step 58, the output 31 of the strain sensor 23 in the finish rolling section 32 given the phase difference X is A / D converted and taken in, and the average value b of the strain data in the finish tooth section 32 is stored. . Here, in step 59, the calibration value A = X / (ba ) of the strain sensor is obtained from the difference (ba) between the phase difference X given to the die and the average value of the strain data output at that time. In step 67 using this correction value (as the calibration of the strain sensor and the initial phase adjustment of the left and right dies), the phase difference Y = −A * b to be given to the left and right dies of the strain sensor is stored as the phase correction value of the die. Thus, reference is made and added at the start of machining so that the strain amount b at the time of machining immediately before the next new finish rolling process becomes zero.

FIG. 6 is a flowchart showing the left and right die rolling processing and phase correction program after the initial phase correction value Z (cumulative) is given to the strain sensor 23 and the strain sensor is calibrated by the flow chart (step 68) of FIG. Shows the chart. In step 60 of the flowchart of FIG. 6, the strain sensor is reset to zero (given an initial phase correction value Z) so that the strain amount b immediately before the next new finish rolling process is zero (given the initial phase correction value Z). After a new roll is supported on the center, a predetermined phase correction value Z (cumulative) is given to the dies by NC command before starting rolling, and then the second servo motor 13 is operated to A (cumulative) phase difference is given. Due to strain sensors calibrated to give an initial phase correction value Z (cumulative) in the strain sensor 23 of FIG. 8, shown in illustration showing a working setup of the left and right dies rolling and phase correction by the flow chart of FIG. 6 Suyo In step 62, the left and right dies are advanced by the finish rolling section 34. Next, in step 63, the output 33 of the strain sensor 23 in the finish rolling section 34 to which the phase difference Z is given is A / D converted and taken in, and the average value c of the strain data in the finish tooth section 34 is stored. . Next, in step 64, the finish rolling process is completed, and then in step 65, the phase correction value Y of the left and right dies for making the average value c of the strain sensor zero, that is, for making the relative phase difference between the left and right dies zero. ', Using Y = -A * b, Y' =-A * c is calculated and stored, and in step 65, the initial phase correction value Z (cumulative) in the subsequent rolling process of the workpiece. When the average value c of the strain sensor obtained by calibrating the strain sensor exceeds a predetermined limit value, Y ′ is added to the initial phase correction value Z (cumulative) to further calibrate the strain sensor. As a result, the same type of rolled material can be obtained by performing the calibration of the strain sensor and the right and left dice initial phase adjustment shown in FIG. A strain sensor calibrated by giving Z (cumulative) is further calibrated to provide an automatic phase adjustment rolling machine that can calibrate the phase correction amount with high accuracy and easily.

The block diagram which shows the front view of the automatic phase adjustment rolling machine of embodiment of this invention. The right view seen from the surface parallel to the axial center 111 of the to-be-rolled product 11 of FIG. (A) shows the attachment state of the to-be-rolled object 11 of FIG. 2, (b)-(e) shows the attachment state of the different kind of to-be-rolled object from the to-be-rolled object of FIG. The control block diagram of the automatic phase adjustment rolling machine of FIG. The flow chart which shows the calibration of the distortion sensor 23 of FIG. FIG. 6 is a flow chart showing a left-right die rolling process and a phase correction program after the initial phase correction value Z (cumulative) is given to the strain sensor 23 and the strain sensor is calibrated by the flow chart of FIG. 5. Explanatory drawing which shows the work setup of the calibration of the distortion sensor 23 and the right-and-left dice initial phase alignment operation by the flow chart of FIG. FIG. 7 is an explanatory diagram showing a work setup for left and right die rolling processing and phase correction by the flow chart of FIG. 6 using a strain sensor calibrated by giving an initial phase correction value Z (cumulative) to the strain sensor 23; Explanatory drawing which calculates the deviation | shift amount from a point-symmetrical position with respect to the to-be-rolled product axial center of a pair of flat die shown in FIG. AA line sectional view of gearbox 2 of FIG. The right view of the rolling machine of patent document 1. FIG.

Explanation of symbols

1: Rolling machine body, 2: Gear box, 3: One of the ball screw shafts, 4: The other of the ball screw shafts, 5: Drive shaft of the first servo motor, 7, 8: Slide table, 9, 10 : Flat dies 11, 25: Rolled product, 12: First servo motor, 13: Second servo motor 15, 16: Support center member, 19: Intermediate shaft 20, 21: A pair of rotating plates, 23, 23 ': Force sensor, 111: Rolled product axis

Claims (2)

A pair of flat dies are arranged in parallel to the product to be rolled, and the product to be rolled is supported between the flat dies so as to be rotatable between support centers, and is sandwiched between the flat dies. Alternatively, a rolling machine for rolling a gear, and a force sensor capable of detecting the force in the direction of travel of the flat die applied to the workpiece during the rolling process is provided on a support center mounting portion for attaching a detachable support center member. Displacement that receives the signal from the force sensor and converts the pair of flat dies from the point-symmetrical position relative to the rolled product in the calibration of the force sensor and the initial phase adjustment of the left and right flat dies. has a volume calculating means, the NC phase correction means for correcting the NC command the other relative phase position relative to one of said pair of flat dies to eliminate the deviation amount, the force sensor is strain Or a piezoelectric strain sensor, and the force sensor is provided on the support center mounting portion so as to be vertically symmetrical with respect to the axis of the article to be rolled, and is rotated with the initial phase difference A between the pair of flat dies. The output a of the force sensor at the time of forming is stored, and then the NC phase correction means is instructed to perform rolling processing in the state of B in which the initial phase difference of a pair of flat dies is shifted by X When the output b of the force sensor is stored, the level difference between the sensor outputs a and b and the phase difference X of the flat die, the calibration value of the force sensor, that is, the flat die initial phase difference correction amount A per unit sensor output (A = X (b−a)) is calculated, and the NC phase correction means Z receives an initial phase correction amount Z so that the output of the force sensor is equivalent to the output when the initial phase difference of a pair of flat dies is zero. The first of a pair of flat dies Automatic phase adjustment rolling machine being characterized in that the closer the phase difference to zero. Oite to claim 1, after giving the initial phase correction amount Z, finishing in rolling section, the initial phase correction amount output of the force sensor gave Z uptake converts A / D, the initial phase The average value c of the force data in the finishing tooth section after giving the correction amount Z is stored, and then the average value c of the force sensor after giving the initial phase correction amount Z is set to a predetermined limit value. When exceeding, the average value c of the force sensor after giving the initial phase correction amount Z, that is, the phase correction value Y ′ of the left and right flat dies for making the relative phase difference of the right and left flat dies zero, Y = -A * b is used to calculate Y '=-A * c, and Y' is added to the initial phase correction value Z (cumulative) for subsequent rolling processing of the rolled product. automatic phase adjustment rolling machine according to claim 1 Symbol mounting, characterized in that the.

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