JP2007290014A - Method and apparatus for manufacturing metal ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the variation of a perimeter after working a metal ring. <P>SOLUTION: The metal ring is rolled until the thickness of the metal ring becomes the target thickness (P12) and the perimeter of the metal ring is measured when reaching the target thickness (P13). The perimeter when working the metal ring which is necessary to make the metal ring plastically deform from the measured perimeter to the target perimeter is calculated on the basis of the correlation between the plastic rate and the tension rate of the metal ring (P14) and the metal ring is worked into the target perimeter by drawing the metal ring to the perimeter when working (P15). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for processing a metal ring constituting a laminated metal ring for a belt type continuously variable transmission into a desired circumferential length.

  A laminated metal ring used in a belt-type continuously variable transmission is usually configured by laminating 8 to 12 metal rings having slightly different circumferential lengths. Therefore, if the dimensional accuracy of the circumference of the metal ring is low, the metal rings cannot be densely stacked, and therefore the circumference of the metal ring must be strictly managed.

  As described in Patent Document 1, the metal ring is processed to a desired peripheral length by stretch processing, but the peripheral length of the metal ring in the pulled state (processing peripheral length) is Since it is the length obtained by adding the plastic deformation amount and the elastic deformation amount to the circumference, when the tension is stopped, the elastic deformation amount returns (spring back) out of the total deformation amount. It becomes longer than the circumference by the amount of plastic deformation.

Therefore, conventionally, the above-mentioned stretch processing has been generally performed by setting a peripheral length during processing such that the peripheral length after the stretch processing becomes the target peripheral length based on experience and experiment. FIG. 7 shows a flow of a conventional metal ring manufacturing method.
JP 2004-17071 A

  However, the above-described method has a problem in that the circumference of the metal ring after processing is large and the metal rings do not adhere to each other when they are stacked.

  The present invention has been made in view of such technical problems, and an object of the present invention is to reduce circumferential length variation after processing of a metal ring.

  In the metal ring manufacturing method and manufacturing apparatus according to the present invention, the metal ring is rolled until the plate thickness of the metal ring reaches the target plate thickness, and the circumference of the metal ring having the target plate thickness is measured. Then, the processing ring circumference required for plastic deformation of the metal ring from the measured circumference to the target circumference is calculated based on the correlation between the plastic modulus of the metal ring and the tensile rate. The metal ring is machined to the target circumference by pulling to the circumference during machining.

  According to the present invention, the peripheral length after processing of the metal ring can be brought close to the target peripheral length with high accuracy.

  A metal ring manufacturing method according to the present invention is a method of precisely processing a metal ring constituting a laminated metal ring, which is one of the components of a belt of a belt-type continuously variable transmission, to a target circumference, Is formed by primary processing (rough processing) that substantially processes the metal ring to the target circumference, and secondary processing (finishing processing) that further brings the metal ring processed to the target peripheral length closer to the target circumference.

  Hereinafter, the contents of primary processing and secondary processing will be described with reference to the drawings.

Primary processing (rough processing)
FIG. 1 shows a schematic configuration of a primary processing apparatus 1 for performing primary processing of a metal ring.

  The primary processing apparatus 1 includes a work roll 2, a tension roll 3 that is disposed apart from the work roll 2 and can be displaced in a direction approaching or separating from the work roll 2 by an air cylinder (not shown), A rolling roll 4 disposed opposite to the roll 2, a pair of intermediate rolls 5a and 5b disposed opposite to the rolling roll 4 across the work roll 1 and disposed opposite the work roll 2, and an intermediate And a backup roll 6 disposed in contact with the rolls 5a and 5b.

  A metal ring 10 is wound around the work roll 2 and the tension roll 3. A timing belt 12 is wound around the shaft portion of the rolling roll 4, the shaft portion of the backup roll 6, the idle pulley 7, and the motor 11. When the timing belt 12 is sent by the motor 11, the rolling roll 4 The backup roll 6 rotates synchronously. The rotation of the backup roll 6 is transmitted to the metal ring 10 via the intermediate rolls 5 a and 5 b, and the metal ring 10 rotates between the work roll 2 and the tension roll 3.

  The backup roll 6 and the intermediate rolls 5a and 5b are supported on a common support base (not shown), and an air cylinder (not shown) is provided on the common support base. The backup roll 6 and the intermediate rolls 5a and 5b can be displaced in a direction approaching or separating from the work roll 2 by extending and contracting the air cylinder. Similarly, an air cylinder (not shown) is also provided on the support base of the rolling roll 4, and the rolling roll 4 can be displaced in the direction approaching or separating from the work roll 2 by expanding and contracting this. If the rolling roll 4 is pressed against the metal ring 10, the metal ring 10 can be rolled.

  As shown in FIG. 2, a groove 15 having a depth substantially equal to a target plate thickness t (predetermined fixed value) of the metal ring 10 is formed on the outer peripheral surface of the rolling roll 4. When the plate thickness reaches the target plate thickness t, the edges 16 formed on both sides of the groove 15 come into contact with the work roll 2 to prevent the metal ring 10 from becoming thinner than the target plate thickness t.

  A sensor 23 (plate pressure measuring means) for measuring the distance from the support base of the rolling roll 4 is attached to the support base 21 of the work roll 2. Since the distance between the support bases 21 and 22 increases or decreases in accordance with the thickness of the metal ring 10 sandwiched between the rolling roll 4 and the work roll 2, both the metal rings 10 are not set. If the distance between the support bases (initial distance) is measured in advance, the plate thickness of the metal ring 10 during rolling can be calculated from the measured distance, the initial distance, and the depth of the groove 15.

  Further, when the tension roll 3 is displaced in the direction away from the work roll 2, the metal ring 10 is pulled, and when the metal belt 10 is pulled beyond the elastic limit, the metal belt 10 undergoes plastic deformation, and its circumference is increased. Can be lengthened (stretch processing).

  A sensor 25 (perimeter measuring means) provided in the vicinity of the tension roll 3 is a sensor for measuring the position of the tension roll 3, and the circumference (inner circumference) of the metal ring 10 is the tension roll measured by the sensor 25. The distance between the work roll 2 and the tension roll 3 can be obtained from the position 3 and can be obtained by calculation from the diameters of both rolls.

  FIG. 3 shows the procedure of primary processing.

  First, in step P <b> 11, the coarse material of the metal ring 10 is hung between the work roll 2 and the tension roll 3. The coarse material is a substantially circular ring having a circumference of L0, and is formed by, for example, heat-treating and surface-treating a ring cut out from a maraging steel drum with a predetermined width.

  When the metal ring 10 is set in the primary processing apparatus 1, the rolling roll 4, the intermediate rolls 5 a and 5 b, and the backup roll 6 are separated from the work roll 2, and the tension roll 3 is brought close to the work roll 2. When the metal ring 10 is set in the primary processing apparatus 1, the intermediate rolls 5a and 5b and the rolling roll 4 are displaced so as to contact the metal ring 10, and the motor 11 is driven to rotate the metal ring 10 at a predetermined peripheral speed. .

  In the next process P12 (rolling process), the rolling roll 4 is pressed against the metal ring 10, and rolling of the metal ring 10 is started. During rolling, the thickness of the metal ring 10 is monitored, and rolling is performed until the thickness reaches the target thickness t. At this time, since the circumferential length of the metal ring 10 increases as the plate thickness decreases, the tension roll 3 is displaced in a direction away from the work roll 2 so that the metal ring 10 does not loosen. When the sensor 23 detects that the thickness of the metal ring 10 has reached the target thickness t, the rolling is finished.

  In step P13 (peripheral length measurement step), the peripheral length Lb1 of the metal ring 10 having the target plate thickness t is measured. The circumferential length Lb1 of the metal ring 10 can be obtained by calculation from the distance between the work roll 2 and the tension roll 3 measured by the sensor 25 and the diameters of both rolls.

  In the process P14 (processing circumference calculation process), the plasticity ratio X1 (= (plastic deformation / periphery before processing) × 100 [%]) of the metal ring 10 during stretch processing and the tensile ratio Y1 (= ( Note that there is a correlation (linear relationship) as shown in FIG. 4 between the amount of elongation during processing / peripheral length before processing) × 100 [%]). A processing peripheral length La1 required for processing the metal ring 10 to the target peripheral length Le is calculated.

  Here, the plastic modulus X1 and the tensile modulus Y1 are the following formulas (1) and (2):

Between the plastic modulus X1 and the tensile modulus Y1, the following formula (3):

The relationship expressed by M and n in the formula (3) are constants determined according to the correlation.

  From these formulas (1) to (3), the relational expression (4) between the processing circumference La1 and the plasticity ratio X1 and the circumference Lb1 measured in the process P13:

Can be derived from the target circumference Le and the circumference Lb1 measured in the process P13 by the equation (1), and the calculated plastic modulus X1 and the circumference Lb1 measured in the step P13 are obtained by the equation By substituting in (4), the processing circumferential length La1 can be calculated.

  In step P15 (stretching step), the tension roll 3 is displaced in a direction away from the work roll 2, and the metal ring 10 is moved until the peripheral length of the metal ring 10 being processed becomes the processing peripheral length La1 calculated in step P14. pull. At this time, the pressing force of the rolling roll 4 on the work roll 2 is adjusted so that the plate thickness of the metal ring 10 does not change as much as possible from the target plate thickness t. When the sensor 23 detects that the circumferential length of the metal ring being processed has become the circumferential length La1 during processing, the stretching is finished.

  In the process P16, the tension roll 3 is displaced in the direction approaching the work roll 2, and the intermediate rolls 5a and 5b and the rolling roll 4 are displaced in the direction away from the work roll 2 to thereby move the metal ring 10 to the primary processing apparatus 1. Take out from. Although the circumferential length of the metal ring 30 is shorter than the circumferential length La1 during processing due to the spring back, the circumferential length L1 finally obtained is substantially the target circumferential length Le.

Secondary processing (finishing)
Next, secondary processing will be described.

  As described above, according to the primary processing, the stretch processing is performed so that the target circumferential length Le is obtained based on the correlation between the tensile rate and the plasticity rate after aligning the plate thickness of the metal ring 10, so that after the primary processing The metal ring 10 is substantially aligned with the target circumferential length Le.

  However, there is a slight variation in the processed metal ring, and since the heat treatment is performed to remove the residual stress inside the metal ring 10 after the primary processing, the peripheral length of the metal ring 10 slightly changes and the target circumference is changed. There is a possibility of deviation from the length Le. Therefore, the secondary processing described below is performed following the primary processing, and the peripheral length of the metal ring 10 processed to the substantially target peripheral length Le by the primary processing is further brought closer to the target peripheral length Le.

  FIG. 5 shows a schematic configuration of a secondary processing apparatus 30 for performing secondary processing.

  The secondary processing apparatus 30 includes a second work roll 31 and a tension roll 32 that is spaced apart from the second work roll 31. The second work roll 31 is driven by a motor 33 attached to the shaft portion. The second tension roll 32 can be displaced in a direction close to or away from the second work roll 31 by an air cylinder (not shown). A sensor 35 (perimeter measuring means) that measures the position between the second tension rolls 32 is attached in the vicinity of the second tension rolls 32.

  6 shows the secondary processing procedure.

  In the secondary processing, first, the metal ring 10 that has been heat-treated after the primary processing is hung between the second work roll 31 and the second tension roll 32 (process P21).

  In the next step P22 (second circumference measurement step), the circumference Lb2 of the metal ring 10 is measured. The circumferential length Lb2 of the metal ring 10 is calculated from the distance between the second work roll 31 and the second tension roll 32 from the position of the second tension roll 32 measured by the sensor 35, and from the distance and the diameter of both rolls. Can be obtained.

  In step P23 (second processing circumference calculation step), a processing circumference La2 necessary for processing the metal ring 10 to the target circumference Le by stretch processing is calculated. The calculation of the processing circumferential length La2 pays attention to the correlation between the plastic rate and the tensile rate in the same manner as in the process P14, and the following formula (5) from the target circumferential length Le and the circumferential length Lb2 measured in the process P22:

The plasticity ratio X2 is calculated by the following equation (6) from the plasticity ratio X2 and the circumference Lb2 measured in the process P22:

Calculated by M and n in the formula (6) are constants determined corresponding to the above correlation.

  In the process P24 (second stretch process), the second tension roll 32 is displaced in a direction away from the second work roll 31, and the metal ring 10 is pulled. Then, when it is detected that the circumferential length of the metal ring 10 being processed has reached the processing circumferential length La2 calculated in step P23, the stretching is finished.

  In Step P25, the second tension roll 32 is returned to the direction approaching the second work roll 31, and the metal ring 10 is taken out from the secondary processing apparatus 30. Although the circumferential length of the metal ring 10 is shorter than the circumferential length La2 during processing due to the springback, the circumferential length L2 finally obtained is further greater than the circumferential length before the secondary machining (≈ circumferential length L1 after the primary machining). It is close to the target circumference Le.

  Then, the effect | action of this invention is demonstrated.

  According to the present invention, first, in the primary processing, rolling is performed until the plate thickness of the metal ring 10 reaches the target plate thickness t, and the circumference of the metal ring 10 when the target plate thickness t is reached is measured. Then, the working circumference is calculated from the correlation between the plasticity factor and the tensile rate, and in the stretch process, the metal ring 10 is pulled to the calculated working circumference. Thereby, the metal ring 10 is processed into the substantially target peripheral length Le, and the peripheral length variation after processing can be suppressed.

  At this time, the measurement of the plate thickness of the metal ring 10 during rolling is performed indirectly by measuring the distance between the support base 21 of the work roll 2 and the support base 22 of the rolling roll 4. On the other hand, since it is performed in a non-contact manner, the metal ring 10 is not damaged during measurement. Further, when the plate thickness of the metal ring 10 reaches the target plate thickness t during rolling, the edges 16 formed on both sides of the groove 15 abut against the work roll 2 to prevent further rolling, so that the metal ring 10 Does not become thinner than the target plate thickness t.

  Furthermore, in the secondary processing, the peripheral length of the metal belt 10 after the primary processing is measured, the processing peripheral length is calculated from the correlation between the plasticity factor and the tensile rate, and the second stretch processing is performed. The circumference of 10 can be made closer to the target circumference Le.

  As mentioned above, although embodiment of this invention was described, the said embodiment only showed an example of the structure to which this invention was applied, and is not the meaning which limits the application range of this invention to the said structure. The above configuration can be modified without departing from the gist of the present invention, and these modified examples are of course included in the technical scope of the present invention.

  For example, in the above embodiment, the process P12 for rolling the plate thickness of the metal ring 10 to the target plate thickness t is included only in the primary processing, but the secondary processing device 30 has the same configuration as the primary processing device 1, In the secondary processing, a similar process may be performed between the process P21 and the process P22. Thereby, the circumference variation after secondary processing can be further suppressed. Or you may make it perform such a rolling process only by secondary processing, without performing process P12 which carries out rolling processing to the target board thickness t in primary processing.

  In the above embodiment, the secondary processing is performed after the primary processing to increase the dimensional accuracy of the circumference. However, if sufficient accuracy can be ensured by the primary processing, the secondary processing is eliminated and the primary processing is performed. May be performed only.

It is a schematic block diagram of a primary processing apparatus. It is a schematic block diagram for demonstrating the structure of a work roll and a rolling roll vicinity. It is the flowchart which showed the flow of primary processing. It is a figure which shows the correlation of a plasticity rate and a tensile rate. It is a schematic block diagram of a secondary processing apparatus. It is the flowchart which showed the flow of primary processing. It is the figure which showed the flow of the manufacturing method of the conventional metal ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Primary processing apparatus 2 Work roll 3 Tension roll 4 Roll roll 23 Sensor (plate thickness measuring means)
25, 35 Sensor (perimeter measurement means)
30 Secondary processing device 31 Second work roll 32 Second tension roll

Claims (5)

A rolling step of rolling the metal ring until the plate thickness of the metal ring reaches a target plate thickness;
A circumference measuring step for measuring a circumference of the metal ring that has reached the target plate thickness;
At the time of processing for calculating the processing-time peripheral length of the metal ring necessary to plastically deform the metal ring from the measured peripheral length to the target peripheral length based on the correlation between the plastic ratio and the tensile rate of the metal ring Circumference calculation step,
A stretching step of pulling the metal ring to the peripheral length during processing;
A metal ring manufacturing method comprising: A second circumference measuring step for measuring the circumference of the metal ring after the stretching step;
Correlation between the plastic ring modulus and the tensile rate of the metal ring, which is necessary to plastically deform the metal ring from the circumference measured in the second circumference measurement step to the target circumference. A second machining circumference calculation step for calculating based on the relationship;
A second stretching step of pulling the metal ring to the peripheral length during processing;
The manufacturing method of the metal ring of Claim 1 characterized by the above-mentioned. Work rolls,
A tension roll that is spaced apart from the work roll and is displaceable in a direction away from the work roll;
A rolling roll pressed against the metal ring to roll the metal ring;
A circumference measuring means for measuring the circumference of the metal ring;
A plate thickness measuring means for measuring the plate thickness of the metal ring;
The metal ring is rolled by the rolling roll until the plate thickness of the metal ring measured by the plate thickness measuring means reaches a target plate thickness, and the metal ring has a circumference when the target plate thickness is reached. The length is measured by the circumference measuring means, and the working circumference of the metal ring required for plastic deformation of the metal ring from the measured circumference to the target circumference is determined by the plastic modulus of the metal ring and the tensile force. An apparatus for producing a metal ring, which is configured to calculate based on a correlation between rates and displace the tension roll in a direction away from the work roll to pull the metal ring to the working circumferential length. .   The metal ring according to claim 3, wherein a groove having a depth substantially equal to the target plate thickness of the metal ring is formed on an outer peripheral surface of the rolling roll over the entire circumference of the rolling roll. Manufacturing equipment. The rolling roll is arranged to face the work roll so as to sandwich the metal ring with the work roll,
The metal ring according to claim 3 or 4, wherein the plate thickness measuring means measures a distance between the rolling roll and the work roll, and calculates a plate thickness of the metal ring from the measured distance. Manufacturing equipment.

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