JP2011098360A - Device and method for measuring inflow - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for measuring the inflow, with which the measurement of the inflow of a workpiece when press forming is performed with high accuracy, at low cost. <P>SOLUTION: In the device 10 for measuring the inflow, with which the inflow of the workpiece 3 when press forming is performed, the device includes: a pedestal part 11; a scriber 13 which is erected on one side of the pedestal part 11 and a convex bead inserting part 17 which is provided on the surface on one side of the pedestal part 11 and which is inserted in the bead-shaped portion 3a formed on the workpiece 3. The bead inserting part 17 is formed from a thermoplastic material which is deformable into an optional shape by being softened when heated to not lower than a first temperature and is hardened when cooled to not higher than a second temperature. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an inflow amount measuring device and an inflow amount measuring method, for example, an inflow amount measuring device and an inflow amount measuring method for measuring an inflow amount of a workpiece in press forming such as drawing.

  Conventionally, in a production line that has a press drawing process, the inflow of workpieces during press drawing is measured, and various inflow events (warping and wrinkling) occur during drawing (press forming) based on the inflow. Various events such as occurrence) are being verified.

Here, an outline of press drawing (press forming) will be briefly described with reference to FIG.
As shown in the figure, the press molding is performed by a die die Z having an upper die 1, a punch 2 arranged opposite to the upper die 1, and a cushion ring 4 arranged on the outer periphery of the punch 2. Done.
Specifically, a sheet-like workpiece (material) 3 to be press-molded is placed between the upper die 1 and the punch 2, and then the upper die 1 is lowered, and the upper die 1 and the punch 2 are moved to the workpiece. 3, the drawing process is performed according to the shapes of the upper mold 1 and the punch 2.

Further, as shown in FIG. 8, a bead 1 a that holds the work 3 against the upper die 1 and the cushion ring 4 in order to control the inflow amount of the work 3 (not shown in FIG. 8). 4a is provided.
Further, the die Z having the beads 1a and 4a has a flat area called a management surface 1b and 4b. The management surface 1b of the upper die 1 and the management surface 4b of the cushion ring 4 It is designed to suppress wrinkles generated after being caught and passed through the beads 1a and 4a.

And the measurement of the inflow amount of the workpiece | work 3 in the case of press molding is generally performed in the following procedures.
Specifically, as shown in FIG. 9, first, a masking tape 100 is attached to a part for measuring the inflow amount of the work 3 (molded product) that has been press-molded (press drawing).
Next, the measurer visually looks for the scratch 111 formed when the press passes through the bead in the press molding process, and marks the position of the scratch 111 on the masking tape 100 (positions corresponding to both ends of the scratch 111). Are marked 101 and 102).
Finally, the masking tape 100 is peeled off from the work 3 that has been press-molded, and the marked distance L is measured (the distance between the marks 101 and 102 is measured), and the measured distance L is defined as the inflow amount.

Patent Document 1 proposes to use an inflow amount measuring device including a laser sensor and a computer for measuring the inflow amount of a workpiece during press forming.
Specifically, in Patent Document 1, as shown in FIG. 10, a sensor (laser sensor) 200 for measuring the displacement of the end 3b of the workpiece 3 to be press-molded, and an electric signal (measurement) from the sensor 200 are disclosed. An inflow amount measuring device including an arithmetic processing unit (computer) 210 that calculates the inflow amount of the workpiece 3 based on a signal indicating the displacement) is disclosed.
The sensor 200 is fixed via a positioning jig 207 on the cushion ring 3 that can measure the displacement of the workpiece end 3b. Further, the arithmetic processing unit 210 is connected to a monitor 211 for displaying the arithmetic processing result, a recorder 212 for storing the arithmetic processing result, and the like.

JP 2009-34716 A

However, the measurement method using the masking tape 100 described with reference to FIG. 9 has the following technical problems.
Specifically, as shown in FIG. 11, the workpiece (panel or the like) 3 formed by the drawing die Z has a plurality of scratches 111, 112, 113, 114, 115 formed during drawing. (There are not only scratches when passing through the bead, but also multiple scratches such as scratches made when passing through the die R, etc.). In addition, the plurality of scratches 111, 112, 113, 114, and 115 overlap with each other.

Therefore, it is necessary for the measurer to select a scratch formed when passing through the bead from a plurality of scratches. However, it is difficult to determine which scratch is selected, and the measurement result varies depending on the measurer. It had a technical problem.
That is, the measurement method using the masking tape 100 described above cannot accurately measure the inflow, and as a result, verify various events (various events such as cracks and wrinkles) during press forming. Could not be performed with high accuracy.

  Moreover, the inflow amount measuring device of Patent Document 1 described above includes a sensor (laser sensor) 200, a sensor positioning jig 207 having a structure that prevents vibration of the sensor 200, and an arithmetic processing device (computer) 210. It has a technical problem that the apparatus configuration is complicated and the apparatus itself is expensive.

The present invention has been made to solve the above technical problem, and an object of the present invention is to provide an inflow amount measuring apparatus capable of measuring the inflow amount of a workpiece during press molding with high accuracy. It is to provide at low cost.
Another object of the present invention is to provide an inflow amount measuring method capable of measuring the inflow amount of a workpiece during press forming with high accuracy.

The present invention made to solve the above problems is applied to an inflow amount measuring device for measuring an inflow amount of a workpiece during press forming.
And the said inflow measuring device is provided in the bead-shaped part formed in the one side of the base part, the marking needle standing on one side of the base part, and the base part, and formed in the workpiece A convex bead insertion portion to be inserted, and the bead insertion portion is softened when heated to a temperature higher than the first temperature and can be deformed into an arbitrary shape, and is cured when the temperature is lower than the second temperature. It is characterized by being formed of a plastic material.

By adopting the above configuration, the bead insertion part that has been softened by heating is inserted into the bead shape part of the work, and then cooled and hardened to change the shape of the bead insertion part into the bead shape part of the work. It can be made into a fitting shape. Further, when the inflow measuring device is slid along the bead-shaped portion when the bead insertion portion is cured, a marking line can be attached to the work surface at a predetermined distance from the bead-shaped portion with a marking needle.
Then, in each of the stage where the workpiece is blank-hold molded and the stage where the workpiece is molded to the bottom dead center, the workpiece is marked along the bead-shaped portion of the workpiece using the inflow measuring device of the present invention. If so, the measurement range of the inflow amount of the workpiece during press forming can be clarified by the marking lines (two marking lines) attached to each. This is because the distance between the two marking lines indicates the inflow amount of the workpiece during press forming.
That is, by using the inflow amount measuring device of the present invention, it is possible to measure the inflow amount of the workpiece during press forming with high accuracy and to prevent the measurement results from being varied.

Further, as described above, the bead insertion portion of the inflow amount measuring device of the present invention is formed of a thermoplastic material, so that it can be deformed into an arbitrary shape by heating and softening, and can be reused many times. Is possible. Therefore, the inflow amount measuring device of the present invention can be used universally for dies having different bead shapes.
That is, according to the present invention, since it is not necessary to create an inflow measuring device for each different mold, it is possible to provide an inflow measuring device with reduced costs.
In addition, since this invention is not the structure which uses a laser sensor and an arithmetic processing apparatus (computer) like patent document 1 mentioned above, it does not cause the cost increase of an apparatus cost.

The bead insertion part is preferably made of wax.
By comprising in this way, when sliding an inflow measuring device along a bead shape part, it can be made to slide smoothly (smooth).

Further, an inflow amount measuring method for measuring an inflow amount of a workpiece at the time of press forming, which is performed using the above-described inflow amount measuring device, and heating and softening a bead insertion portion of the inflow amount measuring device; A step of pressing and inserting the softened bead insertion portion into a bead-shaped portion of the workpiece when the workpiece is blank-hold molded, and cooling and hardening the bead insertion portion in that state; and The inflow amount measuring device is slid along the bead-shaped portion, and a first marking line is attached to the workpiece with the marking needle; the inflow amount measuring device is removed from the workpiece; Forming the lined workpiece to the bottom dead center, and the bead-shaped portion of the workpiece molded to the bottom dead center again; Inserting a second insertion line, sliding the inflow measuring device along the bead-shaped portion, and attaching a second marking line to the workpiece with the marking needle; the first marking line and the second marking line; And measuring the distance between the lines as the inflow.
By comprising as mentioned above, the inflow amount measuring method which measures the inflow amount of the workpiece | work in the case of press drawing processing with high precision can be provided at low cost.

Further, the present invention is applied to an inflow amount measuring method for measuring an inflow amount of a workpiece during press forming.
The inflow amount measuring method is an inflow amount measuring method for measuring an inflow amount of a work at the time of press forming, and is a predetermined distance from a bead-shaped portion of the work when the work is blank-hold formed. A step of attaching a first marking line on the workpiece surface; a step of molding the workpiece with the first marking line to a bottom dead center; and a predetermined distance from the bead-shaped portion of the workpiece molded to the bottom dead center. And a step of providing a second marking line on the work surface, and a step of measuring a distance between the first marking line and the second marking line as the inflow amount.

As described above, the inflow amount measuring method of the present invention is formed on the workpiece on the basis of the bead-shaped portion of the workpiece in each of the stage where the workpiece is blank-hold molded and the stage where the workpiece is molded to the bottom dead center. The marking lines (first marking line, second marking line) are attached to the work surface at a predetermined distance from the bead-shaped portion.
And since the distance between the 1st marking line and the 2nd marking line shows the inflow amount of the work in the case of press forming, according to the inflow amount measuring method of the present invention, the measurement range of the inflow amount is clarified. The inflow amount can be measured with high accuracy. Further, according to the inflow amount measuring method of the present invention, it is possible to prevent variation in the inflow amount measurement result.

ADVANTAGE OF THE INVENTION According to this invention, the inflow amount measuring apparatus which can measure the inflow amount of the workpiece | work in the case of press molding with high precision can be provided at low cost.
Moreover, according to this invention, the inflow amount measuring method which can measure the inflow amount of the workpiece | work in the case of press molding with high precision can be provided.

It is the schematic diagram which showed the structure of the inflow amount measuring apparatus of embodiment of this invention. It is the schematic diagram which showed the cross-sectional shape of the bead provided in the die. It is the flowchart which showed the measurement procedure of the inflow amount of the workpiece | work in the case of press molding of embodiment of this invention. It is the schematic diagram which showed the state which has attached the marking line to the workpiece | work shape | molded by the blank hold | maintenance by the inflow amount measuring apparatus of embodiment of this invention. It is the schematic diagram which showed the state which has attached the marking line to the workpiece | work shape | molded to the bottom dead center by the inflow amount measuring apparatus of embodiment of this invention. It is the schematic diagram which showed the measurement range of the inflow amount of the workpiece | work to which the marking line was attached by the inflow amount measuring apparatus of embodiment of this invention. It is the schematic diagram which showed the cross section of the conventionally known die. It is a schematic diagram for demonstrating the bead of a die conventionally known and a management surface. It is the schematic diagram shown in order to demonstrate the measuring method of the inflow amount of the workpiece | work in the case of press molding by a prior art. It is a block diagram of the inflow amount measuring apparatus of a prior art. It is the schematic diagram which showed the damage | wound formed in the press-molded workpiece | work.

Hereinafter, an inflow amount measuring apparatus and an inflow amount measuring method according to an embodiment of the present invention will be described with reference to the drawings.
First, the structure of the inflow measuring device of this embodiment is demonstrated using FIG.1 and FIG.2.
Here, FIG. 1 is a schematic diagram showing the configuration of the inflow measuring device of the embodiment of the present invention. 2 is a schematic diagram showing the cross-sectional shape of the bead provided in the die, and FIG. 2 (a) is a schematic diagram showing the cross-sectional shape of the trapezoidal bead. (B) is the schematic diagram which showed the cross-sectional shape of the bead made circular.
In the description of the present embodiment, a case where press molding is performed using the above-described die Z shown in FIG. 8 is taken as an example. Therefore, the configuration of the die Z will be described with the same reference numerals as those of the above-described prior art.

As shown in FIG. 1, the inflow rate measuring device 10 includes a base portion 11, a marking needle 13 erected on one surface (the lower surface in the drawing) of the base portion 11, and one surface of the base portion 11 ( In the drawing, a rod-shaped core 15 standing on the lower surface) and a convex bead insertion portion 17 that is fitted and fixed to the outer periphery of the core 15 are provided. The bead insertion portion 17 is inserted into a bead-shaped portion 3 a formed on the workpiece 3.
Further, the bead insertion portion 17 is formed of a thermoplastic material, and more preferably, the bead insertion portion 17 is softened and can be deformed into an arbitrary shape when heated to a predetermined softening temperature or higher (for example, 60 degrees or higher). It is formed of a thermoplastic material that cures at room temperature (for example, 30 ° C. or lower) or lower.

Specifically, the base portion 11 is formed of, for example, a synthetic resin, metal, or the like, and a marking needle 13 is erected on the front end side of one surface (lower surface) (the marking needle 13 is formed in the vertical direction of the lower surface). The core 15 is erected on the rear end side of one surface (the core 15 is erected in the vertical direction of the lower surface).
Although FIG. 1 shows an example in which the base 11 is formed in a rectangular parallelepiped block shape, the shape is not particularly limited and can be grasped by a measurer. Any shape can be used.
Further, the marking needle 13 is made of a metal such as stainless steel or iron, for example. The core 15 is made of, for example, synthetic resin or metal.

Further, the bead insertion portion 17 may be formed of any thermoplastic material. For example, the bead insertion portion 17 is desirably formed of a thermoplastic resin (polyethylene resin, silicon) or wax that can be cured at normal temperature, and more preferably formed of wax.
This is because the bead insertion portion 17 can be easily attached to the outer periphery of the core 15 by forming the bead insertion portion 17 with wax. Further, if the bead insertion part 17 is formed of wax, as will be described later, when the bead shape part 17 is cured, the inflow amount measuring device 10 is made smooth along the bead shape part 3a of the work 3. This is because it is easy to attach a marking line to the work 3.

With the above configuration, the inflow measuring device 10 inserts the bead insertion portion 17 softened by heating into the bead-shaped portion 3a of the workpiece 3 formed by the die Z, and then cools and hardens it. The shape of the bead insertion part 17 can be made into a shape that fits into the bead-shaped portion 3 a of the workpiece 3.
Then, by sliding the inflow measuring device 10 with the bead insertion portion 17 cured along the bead-shaped portion 3a, the workpiece 3 can be scratched (marked with a marking line) with the marking needle 13.

Moreover, the cross-sectional shape of the bead formed in the die Z is, for example, a bead 1a1 having a trapezoidal shape as shown in FIG. 2 (a) or a round shape as shown in FIG. 2 (b). There are various shapes such as bead 1a2.
And since the bead insertion part 17 is formed with the thermoplastic material which can be hardened at normal temperature, the inflow amount measuring apparatus 10 of this embodiment can be deform | transformed into arbitrary shapes by heating and softening. However, since it can be reused, it can be used for various types of drawing dies.
Therefore, according to this embodiment, since it is not necessary to prepare the inflow measuring device 10 for every different die Z, it is possible to provide the inflow measuring device 10 with reduced costs.

Next, a method for measuring the amount of inflow of the workpiece 3 using the inflow amount measuring apparatus 10 of the present embodiment will be described with reference to FIG. 1 and FIGS.
Here, FIG. 3 is a flowchart showing a procedure for measuring the inflow amount of the workpiece during press forming according to the embodiment of the present invention.
Moreover, FIG. 4 is the schematic diagram which showed the state which attached | subjected the marking line to the workpiece | work shape | molded by the blank hold | maintenance by the inflow amount measuring apparatus of embodiment of this invention. FIG. 5 is a schematic view showing a state in which a marking line is attached to a work molded to the bottom dead center by the inflow amount measuring device according to the embodiment of the present invention. FIG. 6 is a schematic diagram showing a measurement range of the inflow amount of a work marked with a marking line by the inflow amount measurement device of the present embodiment.
In addition, it is assumed that blank holding molding is performed on the workpiece 3 by the die Z (see FIG. 8) before the processing step shown in FIG. 3 is performed.
3 to 6 show examples in which the workpiece 3 is drawn to form a panel of an automobile body. Moreover, below, the bead insertion part 17 is demonstrated as what is formed with the wax.

As shown in FIG. 3, first, the bead insertion part 17 of the inflow measuring device 10 is heated to a predetermined softening temperature or higher (for example, 60 degrees or higher) to soften the bead insertion part 17 (S1).
Next, the bead insertion part 17 softened in S1 is pressed and inserted into the bead-shaped part 3a of the workpiece 3 subjected to blank hold molding (see FIG. 1), and the bead insertion part 17 is cooled in this state (see FIG. 1). S2). By this cooling, the bead insertion part 17 is hardened (the wax shape is frozen).

Next, it is confirmed that the bead insertion portion 17 is cured, and then the inflow amount measuring device 10 is slid along the bead-shaped portion 3a of the work 3 (panel in the illustrated example) as shown in FIG. The workpiece 3 is marked with a marking line A (scratch) with the marking needle 13 (S3).
That is, the measurer grasps the base portion 11 of the inflow measuring device 10 in which the bead insertion portion 17 is inserted into the bead-shaped portion 3a of the workpiece 3, and moves the inflow measuring device 10 along the bead-shaped portion 3a. The workpiece 3 is slid, and the workpiece 3 is marked with a marking line A (scratch) with the marking needle 13.
Thereby, the marking line A can be attached to the surface of the workpiece 3 at a predetermined distance from the bead-shaped portion of the workpiece 3 with respect to the workpiece 3 at the stage of blank hold molding.
In addition, since bead insertion part 17 is formed of wax, in this step (S3), inflow amount measuring device 10 can be smoothly slid along bead shape part 3a of work 3.

Next, the inflow amount measuring device 10 is removed from the workpiece 3, and then the workpiece 3 with the marking line A is formed to the bottom dead center (S4).
Specifically, the inflow amount measuring device 10 is removed from the workpiece 3, and the upper die 1 is moved to the bottom dead center (predetermined bottom dead center where the molding is completed) with respect to the workpiece 3 with the marking line A. The upper die 1 is raised by lowering to complete the drawing shape of the workpiece 3 with the marking line A.

Next, as shown in FIG. 5, the bead insertion portion 17 of the inflow measuring device 10 removed in S4 is inserted again into the bead-shaped portion 3a of the workpiece 3 (panel in the illustrated example) formed to the bottom dead center. Then, the inflow amount measuring device 10 is slid along the bead-shaped portion 3a, and the workpiece 3 is marked with a marking line B (scratch) with the marking needle 13 (S5).
Thereby, the marking line B can be attached to the surface of the workpiece 3 at a predetermined distance from the bead-shaped portion of the workpiece 3 with respect to the workpiece 3 at the stage where the bottom dead center is formed.

  Next, as shown in FIGS. 5 and 6, the distance l between the marking line A and the marking line B attached to the work 3 (panel in the illustrated example) is measured, and the measured distance l is used as the inflow amount. (S6).

Thus, according to the inflow amount measuring method of the present embodiment, the work 3 is measured using the inflow amount measuring device 10 at the stage where the work 3 is blank-hold formed and at the stage where the work 3 is formed to the bottom dead center, respectively. Scratches (marking line A, marking line B) are made on the surface of the work 3 at a predetermined distance from the bead-shaped part 3a formed on the surface.
And since the distance l between the marking line A and the marking line B indicates the inflow amount of the work 3 during press molding, the measurer can easily recognize the measurement range of the inflow amount of the work 3. it can.
That is, according to this embodiment, since the measurement range of the inflow amount of the work 3 at the time of press forming can be clarified, the inflow amount of the work at the time of press forming can be measured with high accuracy. . Moreover, according to the present embodiment, it is possible to prevent the measurement result of the inflow amount from being varied. That is, in this embodiment, the reliability of the measurement result of the inflow amount can be improved.
As a result, according to this embodiment, various events (various events such as cracks and wrinkles) during press forming can be verified with high accuracy.

  In addition, according to the present embodiment, unlike the above-described Patent Document 1, it is not necessary to use an inflow amount measuring device including a laser sensor and an arithmetic processing device (computer), and thus the inflow amount is measured at low cost. be able to.

Moreover, since the bead insertion part 17 is formed of the thermoplastic material, the inflow amount measuring apparatus 10 of this embodiment can be deformed into an arbitrary shape by heating and softening and can be reused any number of times. It is. As a result, the inflow amount measuring device 10 of this embodiment can be used for various types of drawing dies.
In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible within the range of the summary.

  For example, in the above-described embodiment, the base part 11, the marking needle 13 and the core 15 are configured as separate members, but are not particularly limited thereto. For example, the base part 11 and the core 15 may be integrally configured as one part. For example, the base part 11, the marking needle 13, and the core 15 may be integrally configured as one part.

Z Drawing die 1 Upper die 1a Bead (upper die)
1a1 Bead (upper mold)
1a2 Bead (upper mold)
1b Management side (upper die)
2 Punch 3 Work 3a Bead shape part (work)
4 Cushion ring 4a Bead (Cushion ring)
4b Management surface (cushion ring)
10 Inflow measurement device 11 Base 11 (Inflow measurement device)
13 Marking needle (inflow measuring device)
15 core (inflow measuring device)
17 Bead insertion part (inflow measuring device)

Claims (4)

In an inflow measuring device that measures the inflow of workpieces during press molding,
A base,
A marking needle erected on one side of the base,
A convex bead insertion portion provided on one surface of the base portion and inserted into a bead-shaped portion formed on the workpiece;
The bead insertion portion is formed of a thermoplastic material that is softened and can be deformed into an arbitrary shape when heated to a temperature equal to or higher than a first temperature, and is cured when the temperature is equal to or lower than a second temperature. Quantity measuring device.   The inflow amount measuring device according to claim 1, wherein the bead insertion portion is formed of wax. An inflow amount measuring method for measuring an inflow amount of a workpiece at the time of press forming, which is performed using the inflow amount measuring device according to claim 1 or 2,
Heating and softening the bead insertion portion of the inflow measuring device;
In the stage where the workpiece is blank-hold molded, the bead-shaped portion of the workpiece is pressed and inserted into the bead-shaped portion, and the bead insertion portion is cooled and cured in that state; and
Sliding the inflow measuring device along the bead-shaped portion of the workpiece and attaching a first marking line to the workpiece with the marking needle;
Removing the inflow measuring device from the workpiece, and then molding the workpiece with the first marking line to the bottom dead center;
The bead insertion portion of the inflow amount measuring device is inserted again into the bead shape portion of the work molded to the bottom dead center, the inflow amount measurement device is slid along the bead shape portion, and the workpiece is Marking the second marking line with a marking needle;
Measuring the distance between the first marking line and the second marking line as the inflow quantity. An inflow measurement method for measuring the inflow of a workpiece during press molding,
At the stage where the workpiece is blank-hold molded, a step of providing a first marking line on the workpiece surface at a predetermined distance from a bead-shaped portion of the workpiece;
Molding the workpiece with the first marking line to the bottom dead center;
Applying a second marking line on the workpiece surface at a predetermined distance from the bead-shaped part of the workpiece molded to the bottom dead center;
And a step of measuring a distance between the first marking line and the second marking line as the inflow quantity.

Images