JPH0470091B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Fields The present invention not only makes it possible to measure the bending shape such as the bending angle and bending radius without taking out the bent workpiece, but also to measure the bending shape such as the bending angle and bending radius. The present invention relates to a press brake with a workpiece measuring means and a method for measuring the workpiece, which can smoothly and appropriately measure various types of workpieces having width dimensions.

(b) Prior art When using a press brake to bend a workpiece into a V-shape or an arc shape, the workpiece is sandwiched between a lower mold and an upper mold to perform the specified bending process. After the process is completed, it is measured whether the bending shape of the processed workpiece, such as the bending angle and bending radius, has reached the set values. At this time, if an attempt is made to measure the bent shape of the processed workpiece while it is set on the press brake, the lower die and the like will get in the way, making accurate measurement impossible. Therefore, conventionally, the processed workpiece was taken out from between the lower mold and the upper mold of the press brake and its bent shape was measured. If the measured bending shape differs from the set value, the workpiece is set on a press brake and reprocessed to correct the shape.

(c) Problems to be Solved by the Invention However, with this method, each workpiece must be taken out from the press brake one by one each time the bent shape of the workpiece is measured, which has the disadvantage of reducing processing efficiency.

In addition, Japanese Patent Laid-Open No. 60-247415 discloses a technique for measuring the bending angle of a workpiece within the mold by providing a measuring means for measuring the bending angle in a space formed at an appropriate position of the lower mold. However, these measuring means are all fixedly installed in the longitudinal direction of the lower mold, and there is no problem when bending a single type of workpiece with a single width. When machining many types of workpieces with various widths, it is necessary to provide a large number of measurement means depending on the position of the workpiece to be machined, which results in a lack of versatility. There was also the disadvantage of being uneconomical.

In other words, when bending a workpiece to a predetermined bending angle, in order to obtain the appropriate bending angle, measure the bending angle of the workpiece at multiple points in the width direction of the workpiece, and then adjust the bending operation using the die. It is necessary to correct the bending angle, but the bending angle is measured at a substantially constant position with respect to the widthwise dimension of the workpiece. Therefore, if the dimensions of the workpiece in the width direction differ, the measurement position will change, and conventional press brakes with fixed measuring means cannot perform proper measurement operations. This results in the inconvenience of not being able to meet the needs for processing small quantities of different products.

Furthermore, if the measuring means is fixedly provided,
During setup work such as mold replacement, the measuring means gets in the way, making it impossible to perform the work efficiently, resulting in an inconvenience that the efficiency of the setup work deteriorates.

In view of the above circumstances, the present invention provides a press brake with a workpiece measuring means and a workpiece measuring method thereof, which can measure the bending shape such as the bending angle without taking out the workpiece that has been subjected to bending processing. The purpose is to

In addition, the present invention not only enables efficient work during setup work such as mold replacement, but also enables measurement of the bending shape of workpieces with various widths using a small number of workpiece measuring means. Another object of the present invention is to provide a press brake with a workpiece measuring means and a method for measuring the workpiece, which are capable of appropriately measuring the workpiece according to the width dimension.

(d) Means for Solving the Problems Among the present invention, the invention of the press brake with a workpiece measuring means includes a lower mold 5 and a press brake provided so as to be movable in the vertical direction relative to the lower mold. It has an upper mold 27, a guide means 9 is installed along the longitudinal direction of the lower mold, and a plurality of work measuring units (MC) are arranged in the lower mold along the installation direction of the guide means. , a plurality of workpiece measuring means 10 are provided on the guide means so as to be movable in the longitudinal direction of the lower mold along the guide means so as to be selectively positioned with respect to the workpiece measuring section. be done.

Further, the lower mold is made up of a plurality of unit lower molds 5A formed to have a predetermined length L1 installed in series, and the workpiece measuring section is configured to include the plurality of unit lower molds 5A installed in series. Of these, it may also be a gap formed between unit lower molds that are adjacent to each other.

Further, the workpiece measuring section may include a notch 7 formed in at least one of the mutually opposing side surfaces of the mutually adjacent unit lower molds.

The present invention also provides a lower mold formed by installing a plurality of unit lower molds in series formed to have a predetermined length, and a lower mold that is provided to be movable and driven in the vertical direction relative to the lower mold. having an upper mold, forming a notch on at least one side of the unit lower mold, and having a shape corresponding to the notch of the lower mold;
At least one workpiece measuring section is provided, and at least one workpiece measuring means is provided corresponding to the workpiece measuring section.

Furthermore, the present invention provides a lower mold formed by installing a plurality of unit lower molds in series formed to have a predetermined length, and a lower mold that is provided to be movable and driven in the vertical direction relative to the lower mold. A gap for workpiece measurement is provided between adjacent unit lower molds among the plurality of unit lower molds installed in series, and at least one workpiece measuring means is installed in the unit lower mold. The workpiece measuring means is provided movably along the installation direction of the mold, and the workpiece measuring means has a main body, and a probe supporting means is provided on the main body so as to be movable in the vertical direction, and the probe supporting means is used for measuring the workpiece. It is configured so that it can protrude and retreat in the horizontal direction with respect to the gap.

Furthermore, the present invention includes a lower mold and an upper mold that is provided to be movable and driven in the vertical direction relative to the lower mold, and a guide means is provided along the longitudinal direction of the lower mold. and arranging a plurality of workpiece measuring units on the lower mold along the installation direction of the guide means,
A plurality of workpiece measuring means are provided on the guide means so as to be movable in the longitudinal direction of the lower mold along the guide means so as to be selectively positioned with respect to the workpiece measuring section, and the workpiece measuring means The means each have a pair of probes, and the pair of probes are capable of measuring vertical displacement of the workpiece between adjacent folded portions of the workpiece processed by the lower mold and the upper mold. The pair of probes is provided with a displacement detection means arranged at a predetermined interval in the cross-sectional direction of the lower mold, and detects a relative displacement between the probes in the vertical direction, and a signal from the displacement detection is provided on the pair of probes. A workpiece bending radius calculating means is provided for calculating a bending radius between the adjacent bent portions based on the above.

Furthermore, the present invention includes a lower mold and an upper mold that is provided to be movable and driven in the vertical direction relative to the lower mold, and a guide means is provided along the longitudinal direction of the lower mold. and arranging a plurality of workpiece measuring units on the lower mold along the installation direction of the guide means,
A plurality of workpiece measuring means are provided on the guide means so as to be movable in the longitudinal direction of the lower mold along the guide means so as to be selectively positioned with respect to the workpiece measuring section, and the workpiece measuring means The means each has at least two pairs of probes that are provided movably in the vertical direction, and the two pairs of probes are configured to bend the workpiece through the bending portion by the lower die and the upper die. Each of the probes is provided with a workpiece contacting part that can be freely positioned on both sides of the workpiece with the bending part as the center, and can come into contact with the workpiece, and each of the pair of probes has a It is constructed by providing displacement detection means for detecting relative displacement.

Furthermore, the present invention includes a lower mold and an upper mold that is provided to be movable and driven in the vertical direction relative to the lower mold, and a guide means is provided along the longitudinal direction of the lower mold. and arranging a plurality of workpiece measuring units on the lower mold along the installation direction of the guide means,
A plurality of workpiece measuring means are provided on the guide means so as to be movable in the longitudinal direction of the lower mold along the guide means so as to be selectively positioned with respect to the workpiece measuring section, and the workpiece measuring means The means each has at least two pairs of probes that are provided movably in the vertical direction, and the two pairs of probes are configured to bend the workpiece through the bending portion by the lower die and the upper die. Each of the probes is provided with a workpiece contacting part that can be freely positioned on both sides of the workpiece with the bending part as the center, and can come into contact with the workpiece, and each of the pair of probes has a Displacement detection means for detecting relative displacement is provided, and partial bending angles on both sides of the workpiece with respect to the bent portion of the workpiece are determined from the relative displacement detected by each pair of probes output from the displacement detection means. The bending angle calculation unit is configured to calculate the bending angle of the entire workpiece from the calculated bending angles.

Furthermore, among the present invention, the invention of the workpiece measurement method is
In a press brake that has a lower mold and an upper mold that is provided to be movable in the vertical direction relative to the lower mold, a workpiece to be processed is processed between the upper mold and the lower mold. position, move the upper die vertically relative to the lower die, and insert the workpiece between the upper die and the lower die, thereby bending the workpiece. When measuring the bent shape of a workpiece that is folded through the lower molding die and bent by relative movement of the lower molding die and the upper molding die, a plurality of workpiece measuring means are respectively moved along the longitudinal direction of the lower molding die. The workpiece measuring means is positioned so as to selectively face a plurality of workpiece measuring parts provided in the longitudinal direction of the lower mold, and the plurality of positioned workpiece measuring means are used to measure the workpieces of the upper mold. The bending shape of the workpiece that has been bent between the lower molding die and the lower molding die is measured at a plurality of positions along the longitudinal direction of the lower molding die of the workpiece.

Note that the numbers in parentheses are for convenience and indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions in the drawings. The same applies to the column "(e) Effect" below.

(e) Effect With the above-described configuration, the present invention allows the workpiece measuring means 10 to move in the longitudinal direction of the lower mold to measure the workpiece 3.
This function allows the bending shape of a workpiece at any arbitrary position of 0 to be measured at a plurality of locations.

Furthermore, the gap 7 between the unit lower molds adjacent to each other can also be used as a workpiece measuring section.

Further, the workpiece bending radius calculation means 29 operates to calculate the bending radius of the bent workpiece from the relative displacement of the probe.

Further, the bending angle calculation unit 29 operates to calculate the bending angle of the bent workpiece from the relative displacement of the probe.

(f) Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

Fig. 1 is a diagram showing how the bending angle of a workpiece bent into a V-shape is measured using the workpiece measuring method of a press brake with a workpiece measuring means according to the present invention, and Fig. 2 is a diagram showing a press with a workpiece measuring means according to the present invention. A diagram showing how the bending radius of a workpiece bent into an arc shape is measured using the brake workpiece measuring method. FIG. , FIG. 4 is a front view showing an example of the lower mold of the press brake with workpiece measuring means according to the present invention, and FIG. 5 is a perspective view showing the main parts of another embodiment of the press brake with workpiece measuring means according to the present invention. , FIG. 6 is a perspective view showing an example of a workpiece being bent using the press brake shown in FIG. 3, and FIG. 7 is a diagram showing the workpiece part bent into an arc shape shown in FIG. It is a figure showing the positional relationship with a work contact pin.

The press brake 1 with a workpiece measuring means has a third
As shown in the figure, it has a lower mold part 2, an upper mold part 26, etc., and the lower mold part 2 is arranged in the horizontal direction by arrow A,
It has a lower mold support member 3 extending in the B direction. A support groove 3 is provided on the upper surface of the lower mold support member 3 in the figure.
A is bored extending in the directions of arrows A and B, and a plurality of unit lower molds 5A constituting the lower mold 5 are installed at a predetermined interval L2 in the support groove 3a. There is. As shown in FIG. 4, each unit lower mold 5A has a rectangular parallelepiped-shaped main pair 6 each having a length L1 in the direction of arrows A and B, and on the upper surface 6f of each main body 6, As shown in Figure 1, V of the angle θ'
A groove 6a is formed. Furthermore, as shown in FIG. 4, there is a measurement gap MC between the bodies 6 of the adjacent unit lower molds 5A, 5A, at the left and right ends 6b, 6d of each body 6 in the figure, and therefore , are provided so as to be separated by the mutually opposing side surfaces of the unit lower molds 5A, 5A adjacent to each other, and furthermore, the ends 6b, 6d of the main body 6 are provided with notches 7, 7, respectively.
7 is recessed into the main body 6 by a depth L3.

Furthermore, a guide rail 9 is provided on the side surface 3b of the lower die support member 3 shown in FIG. , a plurality of (three in this embodiment) work measuring devices 10 are installed on the guide rail 9.
are removable, and can be attached to arrows A and B independently.
It is mounted in such a way that it can be moved and driven in any direction. Each work measuring device 10 has a main body 11, and each main body 11 has an arm support portion 1.
2 is provided so as to be movable and driveable in the directions of arrows C and D, which are the vertical directions in the figure. An arm 13 is provided on the arm support section 12 so as to be freely protrusive and retractable in the horizontal directions of arrows E and F, and a probe section 15 is attached to the tip end 13a of the arm 13 as shown in FIG. is provided.

The probe section 15 shown in FIG. 1 has four L-shaped probes 16, 17, 19, 20, etc., and the probe 16 is located at the upper part of the tip 13a of the arm 13 in the figure. , are provided so as to be movable in the directions of arrows C and D. A workpiece contacting part 16a is formed at the tip of the probe 16 to protrude in the direction of arrow C.
6, a probe 17 that pairs with the probe 16 is provided in a form that is movable in the directions of arrows C and D. A workpiece contacting part 17a is formed at the tip of the probe 17 so as to protrude in the direction of arrow C, and to protrude further than the workpiece contacting part 16a of the probe 16 by a set distance _H2 in the direction of arrow E. , a probe 19 is provided below the probe 17 in the figure so as to be movable in the directions of arrows C and D.

The tip of the probe 19 has a workpiece contact part 19.
a is formed to protrude in the direction of arrow C and to protrude by a predetermined distance in the direction of arrow E than the workpiece contacting portion 17a of the probe 17. A pair of probes 20 are provided movably in the directions of arrows C and D. At the tip of the probe 20, a workpiece contacting part 20a protrudes in the direction of arrow C, and is located in the direction of arrow E than the workpiece contacting part 19a of the probe 19.
The probes 16, 17, 19, 20 are formed to protrude by a set distance _H1 in the direction.
are biased in the direction of arrow C via elastic means such as springs (not shown).

Further, a probe displacement detection section 21 is connected to the probe section 15 shown in FIG.
2b, a detection control section 23, and the like. That is,
The probes 16, 17 and probes 19, 20 of the probe section 15 are provided with differential transformers 22, respectively.
a and 22b are connected, and the differential transformer 22
Displacement meters 25a and 25b, which constitute the detection control section 23, are connected to a and 22b, respectively. The displacement meters 25a and 25b each include a detection control section 23.
Pulse generators 25c and 25d constituting the are connected, and the pulse generators 25c and 25d are connected to a bending shape calculation section 29.

Further, in the upper part of the lower mold part 2 shown in FIG.
The upper mold part 26 is provided so as to be movable and driven in the directions of arrows C and D via a ram or the like (not shown), and the upper mold part 26 extends in the directions of arrows A and B.
It has a rank of 7.

Since the press brake 1 has the above configuration, in order to use the press brake 1 to bend a thin plate-shaped workpiece 30 having a thickness of t and a working width of L into a V shape as shown in FIG. First, the workpiece 30 is inserted between the lower mold 5 and the upper mold 27 shown in FIG. 3, and the part of the workpiece 30 to be bent (i.e.
The bent portion 30a) shown in FIG. 6 is positioned over the V-groove 6a of the lower mold 5 shown in FIG. Next, in this state, the upper mold 27 is lowered in the direction of arrow D via a ram or the like (not shown). Then, the tip end 27a of the upper mold 27 is inserted into the workpiece 3 shown in FIG.
0, and further the part 3
Descend in direction D while pressing 0a. Then, the bent portion 30a of the work 30 is placed in the lower mold 5.
It is bent into a V-shape so as to fit into the V-groove 6a, and is pressed against the V-groove 6a.

In this way, when the work 30 is bent into a V shape, the work 30 is folded into the lower mold 5 and the upper mold 2.
7, the bending angle θ
Measure. To do this, first, the upper mold 27 shown in FIG.
The pressing relationship between the mold and the lower mold 5 is released. Then, since the portion 30e on the right side in the figure of the workpiece 30 from the bent portion 30a is heavier than the portion 30f on the left side of the bent portion 30a, the entire workpiece 30 is biased in the direction of arrow G by the weight of the right side portion 30e. The tip 27a of the upper mold 27 and the V groove 6
While being supported by the upper right edge 6e of a, it rotates in the direction of arrow G and leaves the V-groove 6a. Then, the work 30 springs back, and its bending angle θ becomes larger than the angle when it was pressed against the lower mold 5 by the upper mold 27 (that is, the angle θ' of the V-groove 6a).

Next, a plurality of work measuring devices 1 shown in FIG.
0 along the guide rail 9, respectively, to the lower mold 5.
Move it in the directions of arrows A and B, which are the installation directions of
selectively at workpiece measurement positions P1, P2, and P3 (i.e., positions where each workpiece measurement device 10 faces each measurement gap MC aligned with each measurement portion 30h, 30i, and 30j of the workpiece 30 shown in FIG. 6). Position. Next, each work measuring device 10 shown in FIG.
The arm support section 12 of the probe section 12 is moved and driven in the directions of arrows C and D together with the respective arms 13, and each arm 13 is moved as shown in the probe section 1 shown in FIG.
5 and project in the direction of arrow E. Then, the tip portion 13a, probe portion 15, etc. of each arm 13 are inserted into the measurement gap MC, and the probe 15 is positioned below the measurement portions 30h, 30i, and 30j of the workpiece 30 shown in FIG. Ru. At this time, each measurement gap MC has a width of L4 due to the notches 7, 7, as shown in FIG.
(=L2+2・L3), and the width is L
4 is larger than the width L5 of the arm 13 in the directions of arrows A and B shown in FIG. 3, so the arm 13 etc. will not collide with the lower mold 5 etc.

Next, the arm support section 12 of each workpiece measuring device 10 shown in FIG. 3 is raised together with each arm 13 in the direction of arrow C in FIG. 1. Then, the probe section 1 provided at the tip 13a of each arm 13
5 also rises in the direction of arrow C, and each workpiece contacting part 16a, 17a of each probe 16, 17,
Each measurement part 30h, 3 of the workpiece 30 shown in FIG.
It comes into contact with the right side portion 30e of the bent portion 30a at Oi, 30j, and further presses the right side portion 30e with a predetermined pressure in the direction of arrow C in FIG. Further, the work contact portions 19a, 20a of the probes 19, 20 constituting each probe portion 15 shown in FIG.
However, each measurement part 30 of the workpiece 30 shown in FIG.
Bending portion 30a at h, 30i, 30j
The left side portion 30f is pressed in the direction of arrow C in FIG. 1 with a predetermined pressure. At this time, the workpiece 30 is attached to the tip 27a of the upper mold 27 and the upper right edge 6 of the V groove 6a of the lower mold 5.
Since each probe part 1 is supported by
5 presses the workpiece 30 in the C direction, the workpiece 30 will not move in the directions of arrows C, D, etc. and slip off from the lower mold 5. Also,
Probes 16, 17, 19, 2 of each probe 15
0 are independently movable in the directions of arrows C and D, and are biased in the direction of arrow C by elastic means (not shown).
0 probes 16, 17, 19, 20 are work 3
Even if each arm 13 is raised in the direction of arrow C until it comes into contact with 0, these probes 16 and the like will not press the workpiece 30 more strongly than necessary, and will not separate from the workpiece 30 on the way. Not at all.

In this way, the probe section 15 of each workpiece measuring device 10 can measure the measurement portion 30 of the workpiece 30 shown in FIG.
When the probe contacts 30i and 30j, the probe displacement detection section 21 shown in FIG. 1 connected to each probe section 15 is activated. Then, the differential transformer 22a of each probe displacement detection section 21 is connected to each workpiece contact section 16a of each probe 16, 17, respectively.
A voltage V1 corresponding to the relative displacement in the directions of arrows C and D of 17a is output to the displacement meter 25a. Further, the differential transformer 22b of each probe displacement detection section 21 outputs a voltage V2 corresponding to the relative displacement of the probes 19 and 20 in the directions of arrows C and D to the displacement meter 25b, respectively. Then, each displacement meter 25a, 25b has a displacement amount corresponding to the voltages V1, V2 (i.e., the first
Find the amount of displacement corresponding to the distances D ₂ and D ₁ shown in the figure. Furthermore, each of the displacement meters 25a and 25b outputs pulses PS1 and PS2 corresponding to the determined displacement amounts to the bending shape calculation section 29 via pulse generators 25c and 25d, respectively. In response to this, the bending shape calculation unit 29 converts the workpiece 3 shown in FIG.
Each bending angle θ at the measurement portions 30h, 30i, and 30j of 0 is determined from the following equation.

θ=θ1+θ2=arctan (H ₁ /D ₁ ) +arctan (H ₂ /D ₂ )+ε ... (Here, θ ₁ and θ ₂ are the upper mold 27 shown in FIG. 1 with the bent portion 30a as a reference. and work 30
This is the angle formed between the left side portion 30f and the upper mold 27 and the right side portion 30e of the workpiece 30. Also,
H ₁ and H ₂ are respective set distances in the directions of arrows E and F of the workpiece contacting portions 19a and 20a of the probes 19 and 20 and the workpiece contacting portions 16a and 17a of the probes 16 and 17, respectively. Furthermore, ε is a correction value. ) Note that if the bending angles θ of the workpiece 30 measured in this manner at the measurement sites 30h, 30i, and 30j do not match the set values, it is necessary to correct the bending angle θ of the workpiece 30.
For example, if each measured bending angle θ is the same,
Moreover, if these angles θ are larger than the set values, the bending of the workpiece 30 is insufficient as a whole, so the stroke, etc. in the directions of arrows C and D of the upper mold part 26 shown in FIG. 3 is changed. Then, the upper mold 27 adjusts the workpiece 30 so that it is strongly pressed against the lower mold 5, and in this state, the bent portion 30a of the workpiece 30 is sandwiched between the molds 5 and 27. Fold it again to fit it in.

It should be noted that the workpiece 30 is not bent enough overall, and the measurement parts 30h, 30i, 30 shown in FIG.
If the bending angles θ at the measurement site 30i do not match (for example, the bending angle θ at the measurement site 30i is larger than the bending angle θ at the measurement site 30h, and the angle θ at the measurement site 3
(If the bending angle θ at 0j is larger)
The upper mold 27 shown in FIG. 3 is tilted so that the workpiece 30 can be strongly pressed against the lower mold 5 as it moves from the measurement region 30h toward the measurement region 30j,
In this state, the workpiece 30 is bent again.

Furthermore, if the bending angle θ of the measurement portion 30i shown in FIG. 6 is larger than the other bending angles θ, the bending of the central part of the bending portion 30a of the workpiece 30 is insufficient, so that the bending angle θ of the measurement portion 30i shown in FIG. The lower mold 5 is adjusted so that the horizontal level of the upper surface 6f of the lower mold 5 becomes higher toward the center of the lower mold part 2, and the work 30 is bent again in this state.

In the above-mentioned embodiment, by providing the work measuring device 10 for detecting the bending angle shown in FIG.
The bending angle θ can be adjusted without taking out the workpiece 30 bent into a V-shape from the press brake 1.
A case has been described in which the measurement is performed using the workpiece measuring device 10. However, the work measuring device 10 that can be provided in the press brake 1 is not limited to this, and various work measuring devices can be considered. For example, the work measuring device 31 for detecting the bending radius shown in FIG. 2 may be provided in the press brake 1 shown in FIG. 5.

Hereinafter, a workpiece 30 is bent into an arc shape using a press brake 1 equipped with a workpiece measurement device 31 for detecting a bending radius, and the processed workpiece 30 is placed between a lower mold 5 and an upper mold 27 of the press brake 1. A case will be described in which the bending radius R of the workpiece is measured using the workpiece measuring device 10 without taking it out from between the workpieces. Note that the same parts as those explained in FIGS. 1 and 4 are given the same reference numerals, and the explanation of the parts will be omitted.

That is, on the right side of the lower mold support member 3 of the press brake 1 shown in FIG.
The guide rails 9,
A plurality of workpiece measuring devices 10 are provided on the workpiece measuring device 9 so as to be freely movable and driven in the directions of arrows A and B. Tip 1 of arm 13 of workpiece measuring device 10
3a, as shown in FIG.
The probe portion 31 is provided with a rod-shaped probe 32 movable in the directions of arrows C and D. A workpiece contact pin 32a is provided at the tip of the probe 32 so as to protrude in the direction of arrow C.
2, an L-shaped probe 33 is provided so as to be movable in the directions of arrows C and D. A workpiece contact pin 33b is attached to the tip 33a of the probe 33 at the center of the V groove 6a, which is a set distance H away from the workpiece contact pin 32a in the direction of arrow E, which is the cross-sectional direction of the lower mold 5, that is, the upper mold 27. moving center of
It is provided in a shape that coincides with CL and protrudes in the direction of arrow C.

To bend a workpiece 30 into an arc shape using the press brake 1 shown in FIG. 5, first insert the workpiece 30 between the lower mold 5 and the upper mold 27,
The tip end 30b of the workpiece 30 is positioned over the V-groove 6a of the lower mold 5 shown in FIG. In that state,
The upper mold 27 is lowered by a predetermined distance in the direction of the arrow along the movement center CL. Then, the tip 27a of the upper mold 27 comes into contact with the workpiece 30, and further presses the workpiece 30 while descending a predetermined distance in the D direction. Then, the workpiece 30 is bent into an obtuse angle centering around the portion that abuts the upper mold 27 (hereinafter referred to as the bent portion B).

When the workpiece 30 is bent at an obtuse angle around the bending part B, the upper die 27 is raised in the direction of arrow C and positioned at a standby position WP2 a predetermined distance above the workpiece 30.
Next, the workpiece 30 is moved by a predetermined pitch P in the direction of arrow F. In this state, the upper mold 27 is again lowered by a predetermined distance in the direction of the arrow D along the movement center CL, thereby bending the new bent portion B of the work 30 into an obtuse angle shape. In this way, work 3
By bending the workpiece 30 into an obtuse angle at predetermined pitch intervals, the workpiece 30 is bent into an arc shape as shown in FIG.

Next, the workpiece 30 bent into an arc shape in this way
Measure whether the bending radius R of is equal to the set value. Here, the bending radius R means the radius of a circle when the part of the workpiece 30 bent into an arc shape is considered as a part of the circle. In order to measure the bending radius R of the workpiece 30, the upper mold 27 shown in FIG. 2 is first moved upward in the figure by a predetermined distance to position it at the standby position WP2. next,
Two workpiece measuring devices 10, 10 on the right side of Fig. 5
are moved in the directions of arrows A and B along guide rails 9 and 9, respectively, to workpiece measurement positions P2 and
Position at P3. Next, each work measuring device 1
The arm support parts 12 of 0 are moved and driven in the directions of arrows C and D together with the arms 13, respectively, and each arm 13 is moved to the probe part 3 shown in FIG.
1 and project in the direction of arrow E. Then, the tip portion 13a and probe portion 31 of each arm 13 are inserted into the measurement gap MC, and the probe portions 31, 31 are positioned below the measurement portions 30m, 30n of the workpiece 30 shown in FIG. Ru.

Next, in this state, the arm support part 12 of each work measuring device 10 on the right side of FIG.
3 and raise it in the direction of arrow C. Then, the second
Each probe section 31 shown in the figure also rises in the direction of arrow C, and the workpiece contact pin 32a of the probe 32 constituting the probe section 31 comes into contact with the bent portion of the workpiece 30. Further, the workpiece contact pin 33b of the probe 33 constituting the probe section 31 comes into contact with the bent portion B of the workpiece 30.

In this way, each probe part 31 of the workpiece measuring devices 10, 10 can measure the measurement parts 30m, 3 of the workpiece 30.
0n, the probe displacement detection section 21 shown in FIG. 2 connected to each probe 31 is activated. Then, the differential transformer 22a of each probe displacement detection section 21 detects the relative displacement of the workpiece contact pins 32a and 33b in the directions of arrows C and D, respectively.
That is, the voltage V3 corresponding to the vertical displacement of the workpiece between adjacent bent portions is measured by the displacement meter 25a.
Output to. Then, the displacement meter 25a determines the amount of displacement corresponding to the voltage V3 (that is, the amount of displacement corresponding to the distance D shown in FIG. 2). Further, the displacement meter 25a outputs a pulse PS3 corresponding to the displacement amount determined via the pulse generator 25c to the bending shape calculation section 29. Then, the bending shape calculation unit 29 calculates the workpiece 30 shown in FIG.
Each bending radius R at measurement points 30m and 30n
is calculated from the following formula.

R=1/2・D・√( ² + ² )・{(+
) ² + ² }±ε... (Here, H is the workpiece contact pin 3 shown in Figure 2.
Setting distance in the direction of arrows E and F between 2a and 33b, D
is the relative displacement of the workpiece contact pins 32a and 33b in the directions of arrows C and D shown in FIG. 2, and P is the relative displacement of the workpiece 30
The feed pitch in the direction of arrow F, ε is a correction value. ) Here, the above-mentioned formula is derived based on FIG. 2 and FIG. 7 (Here, FIG. 7 is a simplified drawing of FIG. (The lower mold 5 and the upper mold 27 are omitted to clearly show the positional relationship between the workpiece contact pins 32a and 33b.) That is, as shown in FIG. 2, the part of the workpiece 30 bent into an arc shape can be approximately considered as a part of a certain circle, and the workpiece 30 is 30
The outline of the part is a right angle. Therefore, the bent part B of the workpiece 30 that is in contact with the workpiece contact pin 33b shown in FIG. 7, and the bent part to be bent next.
Draw a perpendicular line DL1 from the midpoint N of the straight line _BB1 connecting it with _B1 . In addition, the bent portion B and the workpiece contact pin 32a
A straight line BQ connecting the point Q of the workpiece 30 in contact with
Draw a vertical line DL2 from the midpoint S. If the intersection of these perpendicular lines DL1 and DL2 is O, then the bending radius R is given by R=OB. Here, a perpendicular line is drawn from the point Q and the midpoint S on the extension of the straight line B ₁ B, and its legs are T and U, and ∠QBT=α, ∠OBQ=β, ∠
If OBN=γ, then from FIG. 7, α+β+γ=π, and from the above equation, we get cos(α+β)=cos(π−γ). Therefore, cosα・cosβ−sinα・sinβ=−cosγ... Here, the lengths of the straight lines BT and QT are H and D, respectively, so from the right triangle QBT, cosα=BT/BQ=BT/{(BT) ² + (QT) ² )}=H/
√ ² + ² ... sin α = QT / BQ = D / √ ² + ² ... Also, the lengths of the straight lines BU and SU are the right triangle
From the proportional relationship in QBT, BU=BT/2=H/2 SU=QT/2=D/2 Therefore, from the right triangle OBS, cosβ=BS/OB =√() ² +() ² /R = √(2) ² + (2) ² /R = √ ² + ² / (2・R) ... Also, from the formula, sinβ= ^√1−2 =√1−{( ² + ² ) (4・² )}
...... Furthermore, from the right triangle OBN, cosγ=BN/OB=(P/2)/R =P/(2・R)..., so by substituting the equation into the equation, we get {H/√ ² + ² }・{√ ² + ² / (2・
R)}-{D/√ ² + ² } ・√1-{( ² + ² ) (4・² )}
=-P/(2・R) is obtained. Therefore, rearranging the above equation, (H+P)/(2・R)=D・√{1(
² + ² )}-{1(4・² )}. Therefore, if we further square both sides of the above equation and rearrange it, we get {(H+P) ² +D ² }/(4・R ² )=D ² /(H ² +
^D2 ). Therefore, from the above formula, R is R=√[( ² + ² )・{(+) ² + ²
)}](4・² ) =1/2・D・√( ² + ² )・{(+
) ² + ² }... However, the bent part of the workpiece 30 is
Strictly speaking, it is not a circular arc, so a formula is obtained by adding a correction value ε to the right side of the formula derived by considering the part as a circular arc.

In this way, if each of the measured bending radii R differs from the set value, the workpiece 30 is bent again to correct the bending radius R.

In addition, in the above-mentioned embodiment, the measurement gap
Although the case where the MC is installed between the respective ends 6b and 6d of the adjacent unit lower molds 5A and 5A has been described,
The installation location of the measurement gap MC is not limited to this, but the location of the workpiece 30 inserted between the lower mold 5 and the upper mold 27,
As long as the bending shape such as the bending angle θ can be accurately measured, it may be installed anywhere in the lower mold 5 (for example, in the center of each unit lower mold 5A).

(g) Effects of the Invention As explained above, according to the present invention, the present invention includes the lower mold 5 and the upper mold 27 which is provided to be movable and driven in the vertical direction relative to the lower mold. A guide means such as a guide rail 9 is installed along the longitudinal direction of the lower mold, and a measurement gap MC is formed in the lower mold.
A plurality of workpiece measuring units such as the above are arranged along the installation direction of the guide means, and a plurality of workpiece measuring units such as the plurality of workpiece measuring devices 10 can be selectively positioned on the guide means with respect to the workpiece measuring unit. As shown in FIG. 1, the lower mold is movable in the longitudinal direction along the guide means, so that the bending angle θ, bending radius R, etc. of the workpiece inserted between the lower mold and the upper mold can be controlled. The bent shape of the workpiece can be measured simultaneously at a plurality of positions by a plurality of workpiece measuring means via the workpiece measuring section. As a result, the bent shape of the bent workpiece can be measured at a plurality of positions simultaneously without taking it out from the press brake, making it possible to significantly improve processing efficiency.

In addition, since the workpiece measuring means is provided so as to be movable in the longitudinal direction of the lower mold along the guide means, the workpiece measuring means can be positioned at any workpiece measuring section only when necessary for measurement. Therefore, when replacing molds, etc., it is possible to move the workpiece measuring means to a position where it does not interfere with the work, and prevent the workpiece measuring means from getting in the way and preventing efficient mold replacement work. This allows setup work such as mold replacement to be carried out efficiently.

Furthermore, even if the width of the workpiece changes due to the type of workpiece, the appropriate measurement operation can be performed simply by moving the workpiece measuring means to the workpiece measuring section that corresponds to the width of the workpiece. This eliminates the waste that would occur if a large number of workpiece measuring means are fixedly arranged in a mold for measurement, and can contribute to simplifying the structure of the press brake.

In addition, the lower mold is composed of a plurality of unit lower molds 5A formed in a predetermined length installed in series,
When the workpiece measuring section is a gap formed between adjacent unit lower molds among the plurality of unit lower molds installed in series, in addition to the above-mentioned effects, the workpiece measuring section As a result, it is possible to measure a workpiece using the gap between unit lower molds without providing a special part on the lower mold.

Furthermore, when the workpiece measuring section is configured to include a notch formed in at least one of the opposing side surfaces of the mutually adjacent unit lower molds, the area of the workpiece measuring section is the notch. As a result, the workpiece measurement operation via the workpiece measurement section of the workpiece measurement means can be performed more smoothly.

In addition, a lower mold formed by installing a plurality of unit lower molds formed to a predetermined length in series, and an upper mold provided so as to be movable and driven in the vertical direction relative to the lower mold. a notch is formed in at least one side of the unit lower mold, and at least one
Even in the case where two workpiece measuring sections are provided and at least one workpiece measuring means is provided corresponding to the workpiece measuring section, the area of the workpiece measuring section is the notch formed in the unit lower mold. As a result, the workpiece measurement operation via the workpiece measurement section of the workpiece measurement means can be performed more smoothly.

Furthermore, the present invention further includes a lower mold formed by installing a plurality of unit lower molds formed to a predetermined length in series, and an upper mold provided so as to be movable and driven in the vertical direction relative to the lower mold. a work measuring gap is provided between adjacent unit lower molds among the plurality of unit lower molds installed in series, and at least one workpiece measuring means is installed in the unit lower mold. The workpiece measuring means has a main body, and a probe supporting means is provided on the main body so as to be movable in the vertical direction, and the probe supporting means is provided with respect to the workpiece measuring gap. When configured so that it can protrude and retract in the horizontal direction, the workpiece measuring means can be moved in the installation direction of the unit lower mold, so the workpiece measuring means can be positioned in any workpiece measuring gap only when necessary for measurement. Therefore, when replacing molds, etc., it is possible to move and retreat the workpiece measuring means to a position where it does not interfere with the work, and the workpiece measuring means does not get in the way and prevent efficient replacement work. There is no such problem, and setup work such as mold replacement can be performed efficiently.

Furthermore, even if the width of the workpiece changes due to the type of workpiece being changed, it is possible to perform appropriate measurement operations simply by moving the workpiece measuring means to the workpiece measurement gap that corresponds to the width of the workpiece. This eliminates the waste that would occur if a large number of workpiece measuring means are fixedly arranged within the mold to measure the , and contributes to the simplification of the structure of the press brake.

In addition, since the probe support means is configured to be able to protrude and retract horizontally with respect to the upper and lower and workpiece measurement gaps, even when the lower mold is replaced or the machining shape of the workpiece is changed, the lower mold can be The probe can be easily positioned at the measurement position according to the shape of the workpiece and the processed shape of the workpiece, which is extremely efficient.

Furthermore, it has a lower mold and an upper mold that is provided to be movable and driven in the vertical direction relative to the lower mold, and a guide means is installed along the longitudinal direction of the lower mold, and the A plurality of workpiece measuring units are arranged on the lower mold along the installation direction of the guide means, and the plurality of workpiece measuring units are selectively positioned on the guide means with respect to the workpiece measuring unit,
Each of the workpiece measuring means is provided movably in the longitudinal direction of the lower mold along the guide means, and each of the workpiece measuring means has a pair of probes, and the pair of probes is connected to the lower mold and the upper mold. In order to be able to measure the displacement in the vertical direction of the workpiece between adjacent folded parts of the workpiece processed by,
arranged at predetermined intervals in the cross-sectional direction of the lower mold,
A workpiece bending radius is provided in which the pair of probes is provided with displacement detection means for detecting relative displacement in the vertical direction between the probes, and a bending radius between the adjacent bending portions is calculated based on a signal from the displacement detection means. When the calculation means is provided, in addition to the effect that the plurality of workpiece measurement means mentioned above are movable in the installation direction of the lower mold along the guide means, the workpiece bending radius calculation means calculates the bending radius of the workpiece. It can be found by

The invention also includes a lower mold and an upper mold that is movable and driven in the vertical direction relative to the lower mold, and a guide means is installed along the longitudinal direction of the lower mold, and the guide means is installed along the longitudinal direction of the lower mold. A plurality of workpiece measuring units are arranged on the lower mold along the installation direction of the guide means, and the plurality of workpiece measuring units are selectively positioned on the guide means with respect to the workpiece measuring unit,
Each of the workpiece measuring means has at least two pairs of probes that are provided movably in the longitudinal direction of the lower mold along the guide means, and the two pairs of probes are movable in the vertical direction. are provided so as to be freely positionable on both sides of the workpiece, centered on the bending part, of the workpiece that has been bent by the lower mold and the upper mold through the bending part, and each of the probes is in contact with the workpiece. By providing a workpiece contacting portion that can be used as a guide means, and providing each pair of probes with a displacement detecting means for detecting a relative displacement in the vertical direction between the probes, the plurality of workpiece measuring means described above can be used as a guide means. In addition to being movable along the lower mold in the installation direction of the lower mold, the probe can also measure displacement on both sides of the workpiece around the bending part.

Furthermore, it has a lower mold and an upper mold that is provided to be movable and driven in the vertical direction relative to the lower mold, and a guide means is installed along the longitudinal direction of the lower mold, and the A plurality of workpiece measuring units are arranged on the lower mold along the installation direction of the guide means, and the plurality of workpiece measuring units are selectively positioned on the guide means with respect to the workpiece measuring unit,
Each of the workpiece measuring means has at least two pairs of probes that are provided movably in the longitudinal direction of the lower mold along the guide means, and the two pairs of probes are movable in the vertical direction. are provided so as to be freely positionable on both sides of the workpiece, centered on the bending part, of the workpiece that has been bent by the lower mold and the upper mold through the bending part, and each of the probes is in contact with the workpiece. each pair of probes is provided with a displacement detection means for detecting a relative displacement in the vertical direction between the probes, and each pair of probes output from the displacement detection means is detected. A bending angle calculation section is provided, which calculates partial bending angles on both sides of the workpiece based on the bent portion of the workpiece from the relative displacement, and calculates the bending angle of the workpiece as a whole from the calculated bending angles. Then, in addition to the effect that the plurality of work measuring means already mentioned are movable in the installation direction of the lower mold along the guide means, the bending angle of the work can be determined by the bending angle calculating section.

In addition, in a press brake having a lower mold and an upper mold that is provided to be movable in the vertical direction relative to the lower mold, a workpiece to be processed is placed between the upper mold and the lower mold. The upper mold is moved vertically relative to the lower mold, and the work is inserted between the upper mold and the lower mold, thereby bending the work. When measuring the bent shape of a workpiece that has been bent through a portion and is bent by relative movement between the lower mold and the upper mold, a plurality of workpiece measuring means are respectively set along the longitudinal direction of the lower mold. The workpiece measuring means is moved and positioned so as to selectively face a plurality of workpiece measuring parts provided in the longitudinal direction of the lower mold, and the plurality of positioned workpiece measuring means are used to measure the workpiece measuring means on the upper mold. If the bending shape of the workpiece that has been bent between the mold and the lower mold is measured at a plurality of positions along the longitudinal direction of the lower mold of the workpiece, the lower mold and the upper mold The bending shape of the workpiece, such as the bending angle θ and the bending radius R of the workpiece inserted between them, can be measured simultaneously at a plurality of measurement positions by the workpiece measurement means through the workpiece measurement. As a result, the bent shape of the bent workpiece can be measured simultaneously at multiple measurement points without taking it out of the press brake, making it possible to significantly improve processing efficiency.

In addition, since the workpiece measuring means moves in the longitudinal direction of the lower mold, it is possible to position the workpiece measuring means at any workpiece measuring section only when necessary for measurement. The measuring means can be moved and evacuated to a position where it does not get in the way of work, so the workpiece measuring means does not get in the way and prevent efficient replacement work, and setup work such as mold replacement can be done easily. It can be done efficiently.

Furthermore, even if the width of the workpiece changes due to the type of workpiece, the appropriate measurement operation can be performed simply by moving the workpiece measuring means to the workpiece measuring section that corresponds to the width of the workpiece. This eliminates the waste that would occur if a large number of workpiece measuring means are fixedly arranged in a mold for measurement, and can contribute to simplifying the structure of the press brake.

[Brief explanation of drawings]

Fig. 1 is a diagram showing how the bending angle of a workpiece bent into a V-shape is measured using the workpiece measuring method of a press brake with a workpiece measuring means according to the present invention, and Fig. 2 is a diagram showing a press brake with a workpiece measuring means according to the present invention. A diagram showing how the bending radius of a workpiece bent into an arc shape is measured using the brake workpiece measuring method. FIG. ,
FIG. 4 is a front view showing an example of a lower mold for a press brake with a workpiece measuring means according to the present invention, and FIG. 5 is a perspective view showing a main part of another embodiment of the press brake with a workpiece measuring means according to the present invention. Figure 6 is the third
FIG. 7 is a perspective view showing an example of a workpiece to be bent using the press brake shown in FIG. 7, and FIG. 7 shows the positional relationship between the workpiece portion bent into an arc shape shown in FIG. It is a diagram. 1...Press brake, 5...Lower mold, 5A...
... Unit lower mold, 6b, 6d ... Side surface, 7 ... Notch, 10 ... Workpiece measuring means (workpiece measuring device), 15, 31 ... Probe section, 27 ... Upper mold, 29 ... Bending shape calculation section, 30...workpiece, MC...workpiece measurement section (measurement gap).

Claims (1)

[Scope of Claims] 1. A lower mold and an upper mold that is provided to be movable and driven in the vertical direction relative to the lower mold, and a guide means is provided along the longitudinal direction of the lower mold. a plurality of workpiece measuring units are arranged on the lower mold along the installation direction of the guide means, and the plurality of workpiece measuring units can be selectively positioned on the guide means with respect to the workpiece measuring unit. A press brake with a workpiece measuring means is configured to be movable in the longitudinal direction of the lower mold along the guide means. 2. The lower mold is composed of a plurality of unit lower molds formed to have a predetermined length and installed in series, and the workpiece measuring section is configured to select one of the plurality of unit lower molds installed in series. Claim 1, which is a gap formed between mutually adjacent unit lower molds.
Press brake with workpiece measuring means as described in section. 3. Workpiece measuring means according to claim 2, wherein the workpiece measuring section includes a notch formed in at least one of the mutually opposing side surfaces of the mutually adjacent unit lower molds. Press brake. 4 A lower mold formed by installing a plurality of unit lower molds formed to a predetermined length in series, and an upper mold provided so as to be movable in the vertical direction relative to the lower mold. a notch is formed in at least one side surface of the unit lower mold, and at least one workpiece measuring section is provided in a shape corresponding to the notch of the lower mold, a workpiece measuring means. A press brake with a workpiece measuring means configured by providing at least one of the following in a form corresponding to the workpiece measuring section. 5 A lower mold formed by installing a plurality of unit lower molds formed to a predetermined length in series, and an upper mold provided so as to be movable in the vertical direction relative to the lower mold. A workpiece measurement gap is provided between adjacent unit lower molds among the plurality of unit lower molds installed in series, and at least one workpiece measuring means is installed in the installation direction of the unit lower molds. The workpiece measuring means has a main body, and a probe supporting means is provided on the main body so as to be movable in the vertical direction, and the probe supporting means is provided with respect to the workpiece measuring gap. A press brake with a workpiece measuring means configured to be able to protrude and retract in the horizontal direction. 6. A lower mold and an upper mold provided to be movable and driven in the vertical direction relative to the lower mold, a guide means installed along the longitudinal direction of the lower mold, and a guide means installed along the longitudinal direction of the lower mold. A plurality of workpiece measuring units are arranged on the mold along the installation direction of the guide means, and the plurality of workpiece measuring units are arranged on the guide means so that the plurality of workpiece measuring units can be selectively positioned with respect to the workpiece measuring unit. each of the workpiece measuring means has a pair of probes, and the pair of probes are arranged so as to be movable in the longitudinal direction of the lower die along the means, and the pair of probes are arranged so as to be movable in the longitudinal direction of the lower die. The pair of probes are arranged at predetermined intervals in the cross-sectional direction of the lower mold in order to measure the vertical displacement of the workpiece between adjacent folded parts of the workpiece, Workpiece measuring means comprising: displacement detecting means for detecting relative displacement in the vertical direction; and workpiece bending radius calculating means for calculating a bending radius between the adjacent bent parts based on a signal from the displacement detecting means. Press brake. 7. A lower mold and an upper mold provided to be movable in the vertical direction relative to the lower mold, a guide means installed along the longitudinal direction of the lower mold, and a guide means installed along the longitudinal direction of the lower mold, A plurality of workpiece measuring units are arranged on the mold along the installation direction of the guide means, and the plurality of workpiece measuring units are arranged on the guide means so that the plurality of workpiece measuring units can be selectively positioned with respect to the workpiece measuring unit. The workpiece measuring means each has at least two pairs of probes that are movable in the vertical direction, and the two pairs of probes are provided so as to be movable in the longitudinal direction of the lower mold along the means. The probes are provided so as to be freely positionable on both sides of the workpiece that is bent by the lower mold and the upper mold through the bending part, with the bending part as the center, and each of the probes is capable of contacting the workpiece. A press brake with a workpiece measuring means, wherein a workpiece contacting portion is provided, and each pair of probes is provided with a displacement detection means for detecting a relative displacement in the vertical direction between the probes. 8. A lower mold and an upper mold provided to be movable in the vertical direction relative to the lower mold, a guide means installed along the longitudinal direction of the lower mold, and a guide means installed along the longitudinal direction of the lower mold. A plurality of workpiece measuring units are arranged on the mold along the installation direction of the guide means, and the plurality of workpiece measuring units are arranged on the guide means so that the plurality of workpiece measuring units can be selectively positioned with respect to the workpiece measuring unit. The workpiece measuring means each has at least two pairs of probes that are movable in the vertical direction, and the two pairs of probes are provided so as to be movable in the longitudinal direction of the lower mold along the means. The probes are provided so as to be freely positionable on both sides of the workpiece that is bent by the lower mold and the upper mold through the bending part, with the bending part as the center, and each of the probes is capable of contacting the workpiece. each pair of probes is provided with a displacement detection means for detecting a relative displacement in the vertical direction between the probes, and the relative displacement detected by each pair of probes is output from the displacement detection means. A workpiece comprising a bending angle calculation unit that calculates partial bending angles on both sides of the workpiece based on the bending part of the workpiece from the displacement of the object, and calculates the bending angle of the workpiece as a whole from the calculated bending angles. Press brake with measuring means. 9. In a press brake that has a lower mold and an upper mold that is movable in the vertical direction relative to the lower mold, the workpiece to be processed is placed between the upper mold and the lower mold. The upper mold is placed at a processing position, the upper mold is moved in the vertical direction relative to the lower mold, and the workpiece is inserted between the upper mold and the lower mold, whereby the workpiece is cut into a bent portion. When measuring the bent shape of a workpiece that is bent by relative movement of the lower mold and the upper mold, a plurality of workpiece measuring means are respectively moved along the longitudinal direction of the lower mold. the workpiece measuring means is positioned so as to selectively face a plurality of workpiece measuring units provided in the longitudinal direction of the lower mold, and the plurality of positioned workpiece measuring means A workpiece measuring method comprising: measuring a bent shape of a workpiece that has been bent between a die and a lower die at a plurality of positions along the longitudinal direction of the lower die of the workpiece.