JPH0694048B2 - Axis straightening device for long metal members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a vehicle door sash, a guide rail, and the like.
The present invention relates to an axial bend straightening device that straightens a long metal member that has been axially bent in a desired shape in advance.

(Prior Art) Conventionally, as a means for correcting the bending state of a member to be processed, there is known one that corrects the installed position of the door frame after brazing in the manufacturing process of the door subassembly with a frame for automobiles ( (Actual No. 61-92413).

This correction means is provided in the correction section after the correction section at the door frame installation position is moved to the measurement origin position by the drive source at the start of work and stopped by detecting it with the detection sensor at the measurement origin position. The built-up position measuring sensor measures the built-up position of the door frame, calculates the bending amount of the door frame to be corrected based on this measurement signal, and activates the drive source of the correction unit according to the bending amount. After straightening the door frame by pushing the bending amount in the straightening unit, the straightening unit is returned, the building position measurement sensor measures the building position of the door frame again, and the measurement signal is sent to the controller. The bending amount of the door frame is calculated, and the straightening unit is moved according to the bending amount to repeatedly operate the straightening unit until the bending amount becomes zero.

When the correction means is applied to correct an automobile door sash S having, for example, a cross-sectional shape as shown in FIG. 15 and an axial line bending shape as shown in FIG.
Whether the axial line portion S ₁ is fixed and the axial line portion S ₂ or S ₃ extending from the fixed axial line portion S ₁ is located on the plus side or the minus side with respect to the predetermined bending shape reference point O, or this position is as shown in FIG. It is measured as the first data of the work start, such as how much is beyond the allowable range, and after moving the correction part based on the measured data, the measurement origin and the current axis part S ₂ or S Measure the next bending amount between position ₃ and
This must be carried out by the procedure of repeatedly operating the correction unit until the bending amount reaches the target value of zero.

(Problems to be solved by the invention) However, when the above-mentioned correction means is applied to an axial bending member such as an automobile door sash, the correction target value is corrected from both the plus side and the minus side.
Not only is it difficult to handle due to the large amount of data, but also the amount of bending must be calculated in consideration of material variations, work types, correction points, initial setting positions, etc. It becomes a thing.

(Means for Solving the Problems) An axial bending corrector according to the present invention has a fixing device for fixing a part of a metal member that has been axially bent in a desired shape in advance, and an axis part for correcting the bending of the metal member. Of the metal member, the axis portion of the metal member is used as a bending reference. A sensor for detecting the contact and separation of the axis portion with respect to the correction portion provided in the correction portion table for moving and deforming in the direction of the angle line, a position detection device for detecting the movement position of the correction portion table from the reference position, and a metal member AV showing each division area in which the interval between the axis part and the bending reference angle line at the initial setting position of
Value, the BV value of the initial correction amount corresponding to each AV value, the BVD value of the increase in the correction amount for each BV value, the CV value of multiple coarse aim values set near the bending reference angle line, and The sensor detects that the correction data storage unit has previously stored the DV value for the increment of the minute correction amount with respect to the CV value, and that the correction unit table has moved from the reference position and the correction unit first comes into contact with the axial line portion. At that time, the value FRC of the moving position of the correction section table is compared with the AV value of the correction data storage section to select the corresponding AV value of the FRC value, and the BV value corresponding to the AV value is selected to perform the first correction. When it is determined that the axial portion has come into contact with the straightening portion for the second time or more, the BVD value corresponding to the selected BV value is increased to the first straightening amount every time and a proper number of straightenings are performed. The FRC value is calculated by calculating the sum of each correction amount and repeating the correction of the axis part. Each time the position of the coarse aim value near the corrective aim value of the AV value is exceeded, each DV value corresponding to each CV value of each rough aim value is incremented to the sum of the corrective amount each time and a correction amount is calculated. A drive control unit that controls the drive motor to correct the axial line portion by moving the correction unit table in the bending reference angle line direction each time based on the calculation result of the calculation unit. When the straightening action of the axis part is repeated several times based on the calculation result, and the FRC value at the position where the straightening part of the straightening part table comes into contact with the straightened part of the straight line is almost equal to the aim value A ₁₂ of the correction value of the AV value. It is configured to stop the correction.

(Operation) In the above configuration, when the drive motor is rotated under the control of the drive control unit to move the correction unit table from the reference position in the bending reference angle direction, the axis portion of the metal member fixed to the fixing device is moved. Since the straightening portion comes into contact with the sensor and the sensor detects the contact of the axial line portion, the FRC value is detected. When the correction portion comes into contact with the axis portion for the first time, the AV value stored in the correction data storage portion is compared with the FRC value, and the AV value corresponding to the FRC value and the BV value corresponding to the AV value are selected. Is
A correction amount (in this case, a movement amount from the reference position to the position where the correction section table should be moved) is calculated by the FRC value, the AV value and the BV value, and the drive motor is controlled based on the calculation result.

By the control of the drive motor, the BVD value corresponding to the BV value is increased to the correction amount each time after the second contact of the axis portion with the correction portion, and the total correction amount is calculated each time. The drive motor is controlled, and the axial portion is gradually corrected in the bending reference angle direction.

After repeating the straightening of the axis part several times, when the value FRC of the contact position of the straightening part with respect to the straightened axis part exceeds the CV values of multiple rough aim values near the straightening aim value, each rough aim value The DV value corresponding to the CV value is increased to gradually reduce the rate of increase in the correction amount, and the correction amount is calculated each time, and based on the calculation result, the drive motor is controlled every time and the axis line portion is further corrected and corrected. The correction function is stopped when the value FRC of the corresponding position of the correction portion with respect to the subsequent axis portion substantially matches the correction target value and is within the tolerance.

Therefore, according to the present invention, when the axial portion of the metal member is straightened toward the straightening aim value, the deformation amount of the axial portion is controlled to be gradually smaller depending on the degree of approaching the straightening aim value from one direction, and finally. Is stopped when it almost coincides with the correction target value, so that the amount of deformation of the axis portion does not become excessive, and accurate correction can always be performed.

(Example) The following is a description with reference to FIGS. 1 to 14.

The axial bend straightening device is applied to straighten a work that has been axially bent into a desired shape in advance, for example, a long metal material such as a door sash or a guide rail for an automobile. As a specific example of the axial bending, for example, when the door sash shown in FIG. 1 is illustrated, this door sash (metal member) S has axial line portions S ₂ and S ₃ extending left and right around the axial line portion S ₁ of the middle side. It is previously bent into a desired shape by a bending machine (not shown). When the axial line is bent, the bending angle β ₁ ,, in a small range beyond the reference angle α with respect to the predetermined bending reference angle O
The beta _{2 ...} or the reference angle each axis portion together in one of a large range not reaching the α S _2, S ₃ bending axis. In accordance with this axial bending process, the axial portion S ₂ is shown in FIG. 1 as being bent to a small range of bending angles β ₁ , β ₂ ... Except for the allowable range of the white part shown in the figure, all are over-bent to the negative side drawn with diagonal lines.

As shown in FIGS. 3 to 5, the straightening device for straightening the axial portion S ₁ or S ₂ of the pre-processed metal member S should set the metal members S at the same position. , A clamp 2 as an example of a fixing device for fixing the metal member S in accordance with a reference point 1 attached to the axial line portion S ₁ and the mark attached to a fixed length position from the tip end before the metal member S is bent together with the reference point 1. Is equipped with. The clamp 2 is configured such that the uncorrected axial line portion S ₁ of the metal member S can be clamped and fixed along the longitudinal direction by a drive cylinder 2a such as air pressure or hydraulic pressure.

A drive mechanism portion for driving the drive motor 3 for servo, pulse, stepping, etc. is arranged at a position projecting from the set position to the left and right of the axial line portions S ₂ , S ₃ of the metal member S,
The drive motor 3 rotates the ball screw shaft 4 connected by the coupling 4a to move the correction section table 6 in a predetermined direction along the guide rail 5. The ball screw shaft 4 is rotatably supported by pedestals 4b and 4c, and the guide rails 5 are attached by fixing the left and right ends to the brackets 5a and 5b, respectively, or directly fixing them to the substrate with bolts.

An actuator dog 6a for preventing the origin and overrun is provided on the moving path side of the straightening unit table 6, and
A pulse generator 7 as an example of a position detection device is arranged on the opposite side. This pulse generator 7 detects the axial dose of the wire 7a by transmitting the movement amount of the wire 7a connecting the metal fitting 6b attached to the correction table 6 and the terminal via the sliding piece 7b.
The wire 7a is rotatably stretched and supported by grooved guide pieces 7c and 7d. Further, an origin detection actuator 8 and overrun prevention actuators 9a and 9b are arranged on the side equipped with the actuator dog 6a.

As shown in FIGS. 4 and 5, the correction unit 10 mounted on the table 6 has a substantially L-shape capable of receiving and mounting the axial portions S ₂ and S ₃ of the metal member S. On the other hand, the lower part of the cam follower 11 has a thrust bearing 11a so that the cam follower 11 can be swung (rotatably).
It is attached to the correction unit table 6 by being fixed at 1c. The corrector 10 is provided with sensors 12a, 12b such as a light emitter and a light receiver on the upper and lower ends of the vertical portion, and the axis line portion S ₂ ,
It is configured to detect the contact and disengagement of S ₃ . The position of the holder 13 that bears the ball screw shaft 4 can be detected by appropriately processing the output signal of the pulse generator 7.

In this straightening device, the clamp 2 is aligned with the reference point 1.
After the metal member S is set by sandwiching the axial line portion S ₁ , the axial line portions S ₂ and S ₃ are moved and deformed several times by the straightening unit 10 to straighten to a predetermined bending reference angle line. In the correction, as shown in FIG. 6, between the initial set position and the predetermined position of the bending reference angle, as shown in FIG. 7, according to the value classification experimentally obtained by the air pushing try. , An area A ₁ , A ₂ , A ₃ ... An (hereinafter, abbreviated as “AV value”), and the initial correction amount (hereinafter, “BV
Value)) and the rough aim values C ₁ , C ₂ ,
The correction amount is set to C ₃ (hereinafter abbreviated as “CV value”) by gradually decreasing the addition value of the correction amount as the CV value set from the side closer to the mechanical origin is passed step by step. However, the CV value is set in the (±) direction of the target value of the upper limit or the lower limit detected by the sensors 12a and 12b, and when it is within the range of (±), the CV value is not applied.

As shown in FIG. 7, a predetermined position of the bending reference angle (hereinafter, simply referred to as “correction target value”) is set as an AV value → A ₁₂ , whereas the CV value is set as shown in FIG. When the axial parts S ₂ and S ₃ are bent in the plus direction, that is, the tolerance value for overcorrection is C ₃ −A ₁₂ , and when the bending process is in the minus direction, the tolerance value for undercorrection is C ₂ −A
Set it to ₁₂ . In addition, an increment of the correction amount is set for each of the set BV values (hereinafter, abbreviated as “BVD value”). Further, a small increment of the correction amount is set for each CV value (hereinafter, abbreviated as “DV value”). At this time
BVD value> DV value, and the DV value is set to a larger value as the corresponding DV value approaches the origin side and a smaller value as it approaches the correction target value.

When these AV, BV, BVD, DV, and CV values are organized, they can be represented as a line graph as shown in FIG. 7, which is used as correction data. That is, AV, BV, BVD, DV and
The CV value is previously stored as correction data in the correction data storage unit of the control device that controls the correction device. When using this correction data, the position where the origin detection actuator 8 is operated by the dog 6a (which may be the position when the origin signal of the pulse generator 7 is output) may be used as the reference position, and the axis portions S ₂ and S ₃ of the metal member S may be used. Sensor 12a, 1
When comparing the positional relationship between the position detected by 2b and the correction aim value, two series of a comparison unit by AV value and a comparison unit by CV value are used. Based on the comparison of the comparison unit, the control device The correction amount is calculated in the calculation unit of.

That is, the operating system is shown in FIG. 8, and it is judged whether it is the first time or the second time or more before starting the comparison by the AV value prior to the initial correction, and whether it is the comparison by the AV value or the CV value. Select. The drive motor 3 is rotated under the control of the control device, the correction unit 10 starts moving from the origin (reference position), and the sensors 12a and 12b sense that the correction unit 10 has come into contact with the axis line portions S ₂ and S _3. Then, the position detected by the pulse generator 7 (hereinafter abbreviated as "FRC") is read into the memory section of the control device, the position is stored, and the comparison section is moved to. In the comparison unit, the AV value (or CV value) is compared and selected depending on whether it is the first comparison or the second comparison or later, and the overcorrection against the correction aim value generated when the metal member is corrected is prevented in advance. To do. When the comparison operation does not satisfy A ₁ ≧ FRC, the next A ₂ ≧ FRC, & A ₃ ≧ FRC ... If satisfied, the AV value comparison unit stores the fact that the first time has passed and sets a flag. At this time, FRC is A
Since there is a positional relationship that satisfies the V value A _K-1 <FRC ≦ A _K , the corresponding initial correction amount BV value is selected.

In addition, the BVD value, which is the addition value of the correction amount, is selected in order to proceed the correction toward the CV value C ₁ from the second time. As a result, the correction amount including the correction amount set in the initial stage is determined. In other words, correction amount for FRC that satisfies _{A K-1 <FRC ≦ A} K segment = (BV value) + (FRC) + (correction amount) is computed by the computing unit of the control device. The calculation result is stored as a total sum from the reference position and further preset. The drive motor 3 is controlled by the drive control unit based on the calculation result of the calculation unit, and the table 6 and the correction unit 10 are moved. The movement of the correction unit 10 is constantly checked via the pulse generator 7, and the drive motor 3 continues to operate up to the preset value. When the movement distance reaches a preset value by the operation, the drive motor 3 is stopped, and after a short time elapses until the time set in the timer elapses, the return operation is started.
At this time, a counter that stores the position of the correction unit 10 is up-counted in the correction direction and down-counted in the return direction.

When the sensors 12a and 12b detect that the straightening unit 10 is separated from the axis portions S ₂ and S _{3 of the} metal member S, the returning operation is stopped, and after a short time elapses until the timer set time elapses, Alternatively, after retreating an appropriate distance from the separated position, the movement is started again in the correction direction. Accordingly, the counter that stores the position of the correction unit 10 is counted up. The springback amount can be detected by detecting the position where the straightening unit 10 starts the returning operation and the position where the axis portions S ₂ and S ₃ separate from the straightening unit 10 and calculating the difference therebetween.

By the way, when straightening is performed by moving the axial line portions S ₂ and S ₃ with the straightening unit 10, the straightening unit 10 uses the straightening unit table 6
Since it is provided so that it can be swung freely (rotatably), the portion where the correction portion 10 is in contact with the axial line portions S ₂ and S ₃ always follows the axial line portions S ₂ and S ₃ , and the axial line portion line contact or surface contact is maintained with, stabilize the axis portion was orthodontic force S _2, S
Can be given to ₃ . That is, the axial portions S ₂ and S ₃ are not deformed excessively except for correction.

In the correction from the second time, when the sensors 12a, 12b sense the axial portions S ₂ , S ₃ of the metal member S, the position detected by the pulse generator 7 is read, the position (FRC) is stored, and the comparison unit is selected. . Since the flag is set at the first time, the selection can be determined. At the second time, when the comparison with the CV value is started and the condition is satisfied with C ₁ ≧ FRC, the BVD value selected at the first time is added to the previous total sum (calculation result) to obtain the total sum. Saved again. Further, in the second and subsequent correction operations, the BVD value selected at the first time is sequentially added as the increase in the correction amount until the condition is not met toward the CV value C ₁ .

Therefore, instead of directly changing the correction amount to approach the correction target value (A _{12 of} AV value), the rough correction target value CV
By advancing the straightening operation toward the value C _1, there are variations in materials and characteristics, variations in cross-sectional shape, variations from the machining process, etc. However, even if the value is included, the dimensional positional relationship can be brought close enough to satisfy the condition of C ₁ <FRC ≦ C ₂ without exceeding the tolerance.

The increase / decrease in the correction amount due to variations in the material or characteristics of the metal member is set as a coded correction amount that is coded using an external converter, thumb switch, etc., and calculated when calculating the initial correction amount. By using it as an element, it is possible to correct changes in the correction amount due to variations in materials and characteristics, so even if the characteristics of the material change significantly from lot to lot, various data (eg AV, BV, CV ... Value of etc.)
It is possible to avoid having to replace a lot.

If C ₁ <FRC ≤ C ₂ satisfies the condition in the previous correction operation, the comparison after that is compared with C ₂ of CV value, and if the condition is satisfied, the increase amount of the correction amount is smaller than the increase amount of BVD value. DV value is CV
The correction amount is (DV value) by being selected according to the value.
+ (Sum). Further, thereafter, the DV value is added to the FRC until the condition of C ₂ ≧ FRC is not met, so the change in the correction amount is as shown in FIG. 9. As a result, C ₂ ≧ FRC
If the condition of C is not satisfied, the next CV value will be compared with C ₃ , so as shown in Fig. 8, C ₂ <FRC
It becomes OK when the condition of ≦ C ₃ is satisfied. That is, the rate of increase in the correction amount is set gradually smaller and the correction operation is repeated.

Incidentally, in the case of FRC> C ₃ and NG because it means that exceeds the positive tolerance. Therefore, C _{2 of} the CV value shows a negative tolerance and C ₃ has a positive tolerance.
In addition, as shown in Fig. 10, the CV is divided into rough aim values.
By using values ( _C1 ≧, _C2 ≧, _C3 ≧, _C4 ≧), it is possible to change little by little as the correction target value is approached. Sufficient accuracy can be maintained. In this case, the operating system diagram shown in FIG. 8 is the operating system diagram as shown in FIG. 11 because the comparison part by CV value is expanded, and the AV, BV, BVD, DV, CV values at that time are also shown. Is as shown in FIG.

In addition to this, the operation system diagram shown in FIG. 13 can be applied as a usage example of the CV value which is a rough aim value for the purpose of improving accuracy. In this example, the relationship between the coarse aim value division and the addition amount is adjusted to gradually decrease by adjusting the width of the coarse aim value and the addition amount in the same manner as the slope-down method used during speed control, thereby approaching the correction aim value. ing. The AV tolerance of A ₁₃ is used for the positive tolerance. At that time, the DV and CV values (the other relationships are not changed) are set as shown in FIG. By doing so, the accuracy with respect to the correction target value can be further ensured and the accuracy can be doubled, and at the same time, changes in the XY axis relationship shown in FIG. 7 caused by small variations in material and characteristics in the same lot. Will be absorbed sufficiently and a stable correction result will be obtained.

Although the above-described embodiment has described only the linear correction operation, the bar or clamp part that partially supports the metal member is moved upward or downward so that surface pressure is applied to the surface correction portion at the same time when the correction operation is started. The surface shape can be corrected by setting the direction from the direction and making it possible to guide during the linear shape correction operation, and controlling the surface pressure by controlling the movement in the vertical direction according to the linear shape correction operation. Become.

[Effects of the Invention] As will be understood from the above description of the embodiments, according to the present invention, when the axial line portion of the metal member is corrected to the correction target value from one direction, it is stored in advance in the correction data storage unit. The correction amount is calculated based on the correction data that is stored, and the rate of increase in the correction amount decreases as the axis part is gradually corrected to the correction target value, so it is corrected to a state that is largely separated from the correction target value of the axis part. Without such a situation, accurate correction can always be performed within the allowable accuracy.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an axial bending shape of a metal member to be straightened by an apparatus according to the present invention, FIG. 2 is a bar graph showing distribution of the excessive bending metal member, and FIGS. FIG. 6 is an explanatory view of a correction apparatus according to the present invention, and FIG. 6 is an explanatory view showing a setting condition of correction data used in the apparatus according to the present invention as a chart.
The figure is a polygonal line graph showing a series of corrections made several times based on the same correction data. Fig. 8 is an explanatory view showing a flowchart of the arithmetic operation based on the same data. Figs. 9 and 10 show the amount of deformation due to correction. Explanatory diagram showing the amount to be performed in a minute range by stroke, Fig. 11 is an operation system diagram showing only the expansion part when the comparison part of the CV value is expanded, and Fig. 12 uses the operation system diagram shown in Fig. 11. In the case of AV, BV, BVD, DV, CV values in the case of a diagram, FIG. 13 is an operation system diagram showing only the modified part of the CV value comparison part modified use example for the purpose of improving accuracy, FIG. The figure is the first
Explanatory diagram showing the DV and CV values (the other relationships are unchanged) when using the operating system diagram shown in Fig. 13, and Fig. 15 is a cross-sectional view showing a long metal member, Fig. 16 The figure is an explanatory view showing the axial bending shape of the metal member to be corrected by the method according to the conventional example,
FIG. 17 is a bar graph showing a variation distribution of the axial bending generated in the same metal member. S …… Metal member S ₁ …… Position axis part to be set S ₂ , S ₃ …… Straightening axis part α …… Bending reference angle β ₁ , β ₂ …… Bending angle in the range that exceeds or does not reach the reference angle 2 ... Fixing device, 3 ... Drive motor 6 ... Correction unit table, 7 ... Position detection device 10 ... Correction unit, 12a, 12b ... Sensor

Claims (1)

[Claims] 1. A fixing device 2 for fixing a part of a metal member S that has been axially bent in a desired shape in advance, and an axial portion S ₂ for straightening the metal member S, which is moved and deformed in a predetermined bending reference angle line O direction. A straightening part table 6 for moving the straightening part table 6 and a drive motor 3 for reciprocating the straightening part table 6 to form an axial bending straightening device, in which the axial part S ₂ of the metal member S is bent in the bending reference angular direction. abutment of the axial portion S ₂ for correcting section 10 with the correction unit table 6 so as to move deformed, sensor 12a for detecting the detachment, 12b and detects the moving position of the correction unit table 6 from the reference position the position detection An apparatus 7 and an AV value indicating each divisional area obtained by dividing the interval between the axial line portion S ₁ and the bending reference angle line at the initial setting position of the metal member S into a plurality of areas A ₁ , A ₂ , A ₃ ... An, Of the initial correction amount corresponding to each AV value
BV value, BVD value of the increase of the correction amount for each BV value, and a plurality of rough aim values C ₁ , C ₂ … C set near the bending reference angle line
The V value and the DV value of the increment of the minute correction amount for each CV value are stored in advance, and the correction unit table 6 is moved from the reference position so that the correction unit 10 moves to the axial line portion S ₂ first. Value FRC of the moving position of the correction unit table 6 when the sensors 12a and 12b detect the contact
And the AV value of the correction data storage unit are compared to select the corresponding AV value of the FRC value, and the BV value corresponding to the AV value is selected to calculate the initial correction amount, and the axis line for the correction unit 10 is calculated. When it is judged that the contact of the portion S ₂ is the second time or more, the BVD value corresponding to the selected BV value is increased to the first correction amount each time, and the sum of the respective correction amounts at the proper number of corrections is calculated. Then
FRC value AV by straightening the axis portion S ₂ is repeated
Each D corresponding to Kakuara target value C _1, C ₂ ... each CV value of each exceeds the correction target value A ₁₂ crude target value C ₁ in the vicinity, C ₂ ... position of the value
A calculation unit for increasing the V value to the sum of the correction amounts each time to calculate the correction amount, and based on the calculation result of the calculation unit, the correction unit table 6 is moved in the bending reference angle line direction each time and the axial line portion S ₂ And a drive control unit for controlling the drive motor 3 to correct the axis of the axial line portion based on the calculation result of the calculation unit.
The correction action of S ₂ is repeated several times, and the FRC value of the position where the correction portion 10 of the correction portion table 6 abuts the corrected axis portion S ₂ is AV.
Aiming for correction of a value An axial bending straightening device for a long metal member, characterized in that the correction is stopped when the value almost coincides with the value A ₁₂ .