KR20220032778A - Press forming apparatus and press forming method - Google Patents

Abstract

The present invention relates to a press forming apparatus and a press forming method, which can draw and form a plate. The press forming apparatus comprises: a first mold including a punch unit pressing at least a portion of one surface of a forming area of a plate to draw and form the plate, and a holding unit installed on both sides of the punch unit to press and hold one surface of a holding area on both sides of the forming area of the plate when the punch unit draws and forms the plate; a second mold provided to face the first mold, and including a die unit supporting the other surface of the holding area of the plate when the punch unit draws and forms the plate; at least one load sensor unit installed on the first mold or the second mold to measure a load value applied to a forming mold including the first mold and the second mold; and a control unit receiving the load value applied to the forming mold in real time from the load sensor unit when the first mold and the second mold are combined to draw and form the plate to calculate a mold load pattern signal resulting from patterning changes of the load value, and comparing the mold load pattern signal and a previously stored reference pattern signal to determine whether drawing forming is abnormal.

Description

Press forming apparatus and press forming method {Press forming apparatus and press forming method}

The present invention relates to a press forming apparatus and a press forming method, and more particularly, to a press forming apparatus and a press forming method capable of drawing a sheet material.

Press working is a kind of plastic working that can be molded into a product having a predetermined shape by cutting or changing the shape of the material mainly by cutting or changing the plate-shaped material using a press forming device, for example, shearing or punching. , trimming, bending, burring, curling and drawing can be processed into various types of materials.

In such a press molding apparatus, a raw material such as a plate is provided between the upper mold and the lower mold of a molding die mounted therein, and then the upper mold is pressed into close contact with the lower mold to mold the product. Due to these characteristics of the press forming apparatus, if the mass production conditions are set, the press forming apparatus continues to operate under the same conditions. There is a quality dispersion in the manufactured products.

However, in the conventional press forming apparatus and press forming method, it is impossible to check in real time whether there is a change or abnormality such as material deviation, process deviation, or wear of the molding die during the mass production process, so the final product is defective through visual inspection There was a problem to check whether or not. In addition, there was a problem in that it was difficult to identify the cause of the defect when the defect occurred according to the defect determination according to the confirmation of the final product.

An object of the present invention is to solve various problems including the above problems, and an object of the present invention is to provide a press forming apparatus and a press forming method capable of detecting a forming defect in real time even during a mass production process. However, these problems are exemplary, and the scope of the present invention is not limited thereto.

According to one embodiment of the present invention, a press forming apparatus is provided. The press forming apparatus is provided on both sides of a punch unit and the punch unit for drawing-molding by pressing at least a portion of one surface of the forming area of the sheet material, and holding areas on both sides of the forming area of the sheet material when the punch unit draws the sheet material. a first mold including a holding part for holding by pressing one surface of the mold; a second mold provided to face the first mold and including a die for supporting the other surface of the holding area of the plate when the punch part draws the plate; a load sensor unit installed in at least one of the first mold or the second mold to measure a load value applied to the molding mold including the first mold and the second mold; and a mold load pattern in which the change in the load value is patterned by receiving the load value applied to the molding mold from the load sensor unit in real time when the first mold and the second mold are molded to form the plate material. A control unit for calculating a signal and comparing the mold load pattern signal with a pre-stored reference pattern signal to determine whether there is an abnormality in the drawing molding; may include.

According to an embodiment of the present invention, the load sensor part is coupled to the punch part or the holding part of the first mold in the form of a bolt or near the die part of the second mold to be applied to the molding mold. It may be a piezo bolt for measuring the load value.

According to an embodiment of the present invention, a linear sensor unit installed in the first mold or the second mold to measure the position of the second mold rising and lowering toward the first mold; may further include.

According to an embodiment of the present invention, the control unit receives the load value of the molding die from the load sensor unit and receives the position value of the second mold from the linear sensor unit, The relationship between the position value and the load value of the molding die may be calculated as the mold load pattern signal.

According to an embodiment of the present invention, the control unit, the relationship between the position value and the load value in a normal state, the relationship between the position value and the load value when the molding is defective, and the position value when the process is abnormal The relationship between and the load value is calculated and stored in advance as the reference pattern signal, and the mold load pattern signal calculated in real time when the sheet is drawn-formed by comparing the reference pattern signal with the reference pattern signal is defective in forming the sheet material Alternatively, it can be determined whether the process of the molding die is abnormal.

According to another embodiment of the present invention, a press forming method is provided. The press forming method includes a seating step of seating the plate material to be draw-molded between the first mold and the second mold of the forming mold; a forming step in which the first mold and the second mold are molded and the punch part formed in the first mold presses at least a portion of one surface of the forming area of the plate material to draw molding; And after the first mold and the second mold are molded, a taking out step of taking out the molded article on which the drawing molding is completed is taken out from the molding mold, in the molding step, the first mold and the second mold are molded When drawing and molding the plate, a load value applied to the molding die is applied in real time from the load sensor unit, and a mold load pattern signal is calculated by patterning the change in the load value, and the mold load pattern signal and the pre-stored reference pattern By comparing the signals, it is possible to determine whether the drawing molding is abnormal.

According to another embodiment of the present invention, in the forming step, the load sensor part is coupled to the punch part or the holding part of the first mold in the form of a bolt, or near the die part of the second mold, and the It may be a piezo bolt that measures the value of the load applied to the molding die.

According to another embodiment of the present invention, in the molding step, the position value of the second mold rising and falling toward the first mold may be applied from the linear sensor unit installed in the first mold or the second mold. .

According to another embodiment of the present invention, in the molding step, the load value of the molding die is applied from the load sensor unit and the position value of the second mold is applied from the linear sensor unit, a pattern signal calculating step of calculating the relationship between the position value and the load value of the molding die as the mold load pattern signal; and an abnormality detection step of comparing the mold load pattern signal with the reference pattern signal to determine whether drawing molding is abnormal.

According to another embodiment of the present invention, the abnormal detection step includes the relationship between the position value and the load value in a normal state, the relationship between the position value and the load value when the molding is defective, and the process abnormality. The relationship between the position value and the load value is calculated and stored in advance as the reference pattern signal, and the mold load pattern signal calculated in real time in the pattern signal calculation step is compared with the reference pattern signal to draw-formed of the plate material. It is possible to determine whether the molding is defective or the process of the molding mold is abnormal.

According to an embodiment of the present invention made as described above, it is possible to detect a molding defect in real time by patterning the signal of the mold load measured through a monitoring system for detecting defects in the press forming process, and to determine a defect factor at the same time. can

Accordingly, a press forming apparatus and a press forming method that can have the effect of improving the productivity of the press forming process and minimizing cost loss by enabling immediate countermeasures through real-time forming failure and process abnormality detection in the mass production press forming process can be implemented Of course, the scope of the present invention is not limited by these effects.

1 is a cross-sectional view schematically showing a press forming apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view schematically showing a punch part of a first die of the press molding apparatus of FIG. 1 .
3 is a cross-sectional view schematically illustrating a cross-sectional view taken along the cut line AA of FIG. 2 .
FIG. 4 is a table showing an example in which a mold load is patterned to detect a molding defect in the press molding apparatus of FIG. 1 .
5 is a graph showing a mold load analysis result according to the molding quality in the press molding apparatus of FIG. 1 .
6 is a flowchart sequentially illustrating a press forming method according to another embodiment of the present invention.

Hereinafter, several preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Examples of the present invention are provided to more completely explain the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, and the scope of the present invention is as follows It is not limited to an Example. Rather, these embodiments are provided so as to more fully and complete the present disclosure, and to fully convey the spirit of the present invention to those skilled in the art. In addition, in the drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically illustrating ideal embodiments of the present invention. In the drawings, variations of the illustrated shape can be envisaged, for example depending on manufacturing technology and/or tolerances. Accordingly, embodiments of the spirit of the present invention should not be construed as limited to the specific shape of the region shown in the present specification, but should include, for example, changes in shape caused by manufacturing.

1 is a cross-sectional view schematically showing a press forming apparatus 100 according to an embodiment of the present invention, and FIG. 2 is a punch part 11 of the first mold 10 of the press forming apparatus 100 of FIG. It is a schematic plan view, and FIG. 3 is a cross-sectional view schematically showing a cross-sectional view taken along the cut line AA of FIG. 2 . And, FIG. 4 is a table showing an example in which the mold load is patterned to detect molding defects in the press molding apparatus 100 of FIG. 1 , and FIG. 5 is a mold according to the molding quality in the press molding apparatus 100 of FIG. 1 . These are graphs showing the load analysis results.

First, as shown in FIG. 1 , the press molding apparatus 100 according to an embodiment of the present invention is largely, a first mold 10 , a second mold 20 , and a load sensor unit 30 . It may include a linear sensor unit 40 , a control unit 50 , and a body 60 in which they are installed.

As shown in FIG. 1 , the press molding apparatus 100 includes a fixing plate 61 of a main body 60 and a press ram 62 that reciprocates up and down toward the fixing plate 61 to form a molding die (M). It may be formed in a structure in which the plate material S seated between the first mold 10 and the second mold 20 of the molding mold M is pressed or struck by attaching the .

More specifically, the press forming apparatus 100 may be classified into a crank press, a knuckle press, a friction press, a screw press, a rack press, a link press, a cap press, etc. according to the structure for raising and lowering the press ram 62. , The crank press such as the press forming apparatus 100 of the present invention installs a driving unit on the upper portion of the main body 60 and uses the rotating shaft of the driving unit as a crank shaft to link it with the press ram 62, in the main body 60 As the press ram 62 rises and descends, the plate material S is moved between the first mold 10 of the molding mold M installed on the fixed plate 61 and the second mold 20 installed on the press ram 62 . It can be pressurized and draw-molded. In this embodiment, although the press forming apparatus 100 is driven by the crank press structure as an example, it is not necessarily limited thereto, and the above-mentioned various driving methods that can draw-form the plate material S by the forming mold M are provided. can be applied.

If the structure of the molding die M that is mounted on the press molding apparatus 100 and can draw-form the plate material S will be described in more detail, as shown in FIG. 1 , the molding die M is, It is fixed to the fixing plate 61 of the body 60, and is installed on both sides of the punch unit 11 and the punch unit 11 for drawing molding by pressing at least a portion of one surface of the forming area of the plate material S, the punch unit A first mold (10) and a first mold (11) including a holding part (12) for holding the plate (S) by pressing one surface of the holding region on both sides of the forming region of the plate (S) during drawing molding It is fixed to the press ram 62 so as to face (10), and the punch part 11 includes a die part 21 for supporting the other surface of the holding area of the plate material S when the plate material S is draw-molded. A second mold 20 may be included.

In this way, the second mold 20 is fixed to the press ram 62 that elevates and reciprocates toward the fixed plate 61 to which the first mold 10 is fixed, and the press ram 62 elevates and reciprocates. According to the movement, it may descend toward the first mold 10 to be molded with the first mold 10 , or it may rise conversely to be separated from the first mold 10 . At this time, in this embodiment, the first mold 10 is fixed to the fixing plate 61 of the main body 60 as a lower mold of the molding mold M, and the second mold 20 is a press ram 62 as an upper mold. For example, the first mold 10 is fixed to the press ram 62 as an upper mold, and the second mold 20 is fixed to the fixing plate 61 as a lower mold, but is not necessarily limited thereto. may be

In addition, when the first mold 10 and the second mold 20 of the molding mold M are molded, the mold load is monitored in real time and the measured mold load is measured by the second mold 20 to the first mold 10 . A load sensor unit 30 and a linear sensor unit 40 may be installed in the molding mold M to be patterned according to a descending distance.

At least one load sensor unit 30 is installed in the first mold 10 or the second mold 20 , and is installed in the molding mold M including the first mold 10 and the second mold 20 . The applied load value is measured, and the linear sensor unit 40 is installed in the first mold 10 or the second mold 20 and ascends and descends toward the first mold 10 of the second mold 20 . position can be measured.

More specifically, the load sensor unit 30 may be coupled to the vicinity of the punch unit 11 or the holding unit 12 of the first mold 10 in the form of a bolt, as shown in FIG. 1 . .

For example, as shown in FIG. 2 , the load sensor unit 30 may be coupled to the punch plate 11b supporting the punch 11a around the punch 11a of the punch unit 11 in the form of a bolt. there is. At this time, at least one load sensor unit 30 may be installed on the punch plate 11b, and when a plurality of load sensor units 30 are installed, the load sensor unit 30 may be radially disposed around the punch 11a to measure the mold load for each area.

More specifically, as shown in FIG. 3 , the load sensor unit 30 may be a bolt-type piezo bolt having a head 31 and a body 32 having threads formed in at least some sections. there is. At this time, the punch plate 11b to which the load sensor unit 30 is coupled is composed of an upper plate P1 and a lower plate P2, and the body 32 of the load sensor unit 30 passes to the upper plate P1. A through hole H1 is formed, and at a position corresponding to the through hole H1 of the lower plate P2, a screw hole H2 in which a female thread is formed so that the load sensor unit 30 can be screwed may be formed. .

Accordingly, the load sensor unit 30 coupled to the upper plate P1 and the lower plate P2 of the punch plate 11b stacked up and down is the lower surface of the head 31 to press the upper surface of the upper plate P1. As a form, the mold load generated when the first mold 10 and the second mold 20 are molded is directly transmitted to the load sensor unit 30 through the punch plate 11b, and the load sensor unit 30 is Through this, it is possible to measure the load value applied to the molding die (M).

The load sensor unit 30 is, for example, installed in the first mold 10, but is not necessarily limited thereto, and although not shown, is coupled near the die unit 21 of the second mold 20 to form a mold The value of the load applied to (M) can also be measured.

In addition, as shown in Figure 1, the control unit 50, the first mold 10 and the second mold 20 are molded to form the plate material (S) from the load sensor unit 30 at the time of drawing molding ( M) receives the load value applied in real time, calculates a mold load pattern signal that patterns the change in the load value, and compares the mold load pattern signal with a pre-stored reference pattern signal to determine whether drawing molding is abnormal can be discerned.

More specifically, the control unit 50 receives the load value of the molding mold M from the load sensor unit 30 and receives the position value of the second mold 20 from the linear sensor unit 40, 2 The relationship between the position value of the mold 20 and the load value of the molding mold M may be calculated as the mold load pattern signal.

For example, the control unit 50, the relationship between the position value and the load value in a normal state, the relationship between the position value and the load value when the molding is defective, and the position value and the load value when the process is abnormal The relationship is calculated and stored in advance as the reference pattern signal, and the mold load pattern signal calculated in real time when the sheet material (S) is drawn-molded by comparing the reference pattern signal with the reference pattern signal. It is possible to determine whether the process of the molding die (M) is abnormal.

As shown in Fig. 4 (a), the mold load pattern (dotted line) when a molding defect occurs compared to the mold load pattern (solid line) in the normal state is stored, and the plate material (S) is drawn in real time It is possible to determine whether or not molding defects occur by comparing the mold load pattern signal calculated as

In addition, as shown in Fig. 4 (b), when the load sensor unit 30 is installed on both sides, both sides when the material eccentricity occurs compared to the mold load pattern (solid line) on both sides in the normal state. By storing the mold load pattern (dotted line), and comparing it with the mold load pattern signal calculated in real time when drawing and molding the plate S, it is possible to determine process abnormalities such as eccentricity of the material.

In addition, as shown in (c) of FIG. 4, the mold load pattern (solid line) in the normal state compared to the mold load pattern (dotted line) when the lubrication is poor is stored, and the plate material (S) is drawn in real time By comparing it with the mold load pattern signal calculated by

In addition, when determining the molding defect, the control unit 50 may determine the type of the molding defect by the change pattern of the load value measured by the load sensor unit 30 .

For example, as shown in (a) of FIG. 5 , there is a clear difference in the change pattern of the load value measured by the load sensor unit 30 in the normal state and when a fracture or wrinkle occurs. It was found that the type of molding defect could be confirmed by the change pattern of the load value.

In addition, as shown in Fig. 5 (b), a clear difference occurs in the pattern of the change rate of the load value measured by the load sensor unit 30 in the normal state and when a fracture or wrinkle occurs. Thus, it was found that the type of molding defect could be confirmed even with the pattern of the change rate of the load value.

Therefore, according to the press forming apparatus according to an embodiment of the present invention, the mold load signal measured through the monitoring system for detecting defects in the press forming process is patterned to detect the forming defect in real time, and at the same time to detect the defect factors. can determine

Therefore, it is possible to take immediate countermeasures through real-time detection of molding defects and process abnormalities in the mass-production press forming process, thereby improving the productivity of the press forming process and minimizing cost loss.

Hereinafter, a press forming method using the above-described press forming apparatus 1000 will be described.

6 is a flowchart sequentially illustrating a press forming method according to another embodiment of the present invention.

The press forming method according to another embodiment of the present invention, as shown in FIG. 6 , largely draws the plate material S to be drawn into the first mold 10 and the second mold 20 of the forming mold M. In the seating step (S10) of being seated between the first mold 10 and the second mold 20, the punch portion 11 formed in the first mold 10 is formed on one surface of the molding region of the plate S. A molding step (S20) of drawing molding by pressing at least a portion of ) can be proceeded in that order.

At this time, in the forming step (S20), the first mold 10 and the second mold 20 are molded and the load value applied to the molding mold M from the load sensor unit 30 when the plate material S is draw-molded. is applied in real time to calculate a mold load pattern signal in which the change in the load value is patterned, and compares the mold load pattern signal with a pre-stored reference pattern signal to determine whether drawing molding is abnormal.

More specifically, as shown in FIG. 6 , in the forming step S20 , the load value of the forming mold M is applied from the load sensor unit 30 , and the second mold 20 is received from the linear sensor unit 40 . ), a pattern signal calculation step (S21) of calculating the relationship between the position value of the second mold 20 and the load value of the molding mold M as the mold load pattern signal and the mold load It may include an abnormality detection step (S22) of comparing the pattern signal and the reference pattern signal to determine whether the drawing forming is abnormal.

For example, the abnormality detection step (S22) includes the relationship between the position value and the load value in a normal state, the relationship between the position value and the load value when the molding is defective, and the position value and the load when the process is abnormal. The relationship between the values is calculated in advance as the reference pattern signal and stored, and the mold load pattern signal calculated in real time in the pattern signal calculation step is compared with the reference pattern signal to determine whether the drawing-molded sheet S is defective or It is possible to determine whether the process of the molding die (M) is abnormal.

Therefore, according to the press forming method according to another embodiment of the present invention, the mold load signal measured through the monitoring system for detecting defects in the press forming process is patterned to detect the forming defect in real time, and at the same time to detect the defect factors. can determine

Therefore, it is possible to take immediate countermeasures through real-time detection of molding defects and process abnormalities in the mass-production press forming process, thereby improving the productivity of the press forming process and minimizing cost loss.

Although the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

10: first mold
11: Punch part
12: holding part
20: second mold
21: Daibu
30: load sensor unit
31: head
32: body
40: linear sensor unit
50: control unit
60: body
61: fixed plate
62: press ram
S: plate
M: molding mold
100: press molding device

Claims (10)

A punch unit for drawing molding by pressing at least a portion of one surface of the forming area of the sheet material, and the punch unit installed on both sides of the punch unit to press and hold one surface of the holding area on both sides of the forming area of the sheet material when the punch unit draws the sheet material a first mold including a holding part;
a second mold provided to face the first mold and including a die part for supporting the other surface of the holding area of the plate when the punch part draws the plate;
a load sensor unit installed in at least one of the first mold or the second mold to measure a load value applied to the molding mold including the first mold and the second mold; and
When the first mold and the second mold are molded and the plate material is draw-molded, the load value applied to the molding mold is applied in real time from the load sensor unit, and the change in the load value is patterned. A mold load pattern signal a control unit that calculates and compares the mold load pattern signal with a pre-stored reference pattern signal to determine whether drawing molding is abnormal;
A press molding device comprising a. The method of claim 1,
The load sensor unit,
A piezo bolt for measuring the load value applied to the molding mold by being coupled near the punch part or the holding part of the first mold in the form of a bolt or near the die part of the second mold, press forming device. The method of claim 1,
a linear sensor unit installed in the first mold or the second mold to measure a position of the second mold rising and falling toward the first mold;
Further comprising a, press molding device. 4. The method of claim 3,
The control unit is
receiving the load value of the molding die from the load sensor unit and receiving the position value of the second mold from the linear sensor unit, the relationship between the position value of the second mold and the load value of the molding die Calculated by the mold load pattern signal, a press molding device. 5. The method of claim 4,
The control unit is
The relationship between the position value and the load value in a steady state, the relationship between the position value and the load value when the molding is defective, and the relationship between the position value and the load value when the process is abnormal are pre-defined as the reference pattern signal Calculated and stored in, and comparing the mold load pattern signal and the reference pattern signal that are calculated in real time when drawing the plate material to determine whether the drawing-molded plate material is defective or the process of the forming mold is abnormal. Press, molding device. A seating step of seating the plate material to be draw-molded between the first mold and the second mold of the molding mold;
a forming step in which the first mold and the second mold are molded to form a punch portion formed in the first mold by pressing at least a portion of one surface of the forming area of the plate material to draw molding; and
Taking out the molded article on which the drawing molding is completed after the first mold and the second mold are mold-opened from the molding mold;
In the forming step,
When the first mold and the second mold are molded and the plate material is draw-molded, the load value applied to the molding mold is applied in real time from the load sensor unit, and the mold load pattern signal is calculated by patterning the change in the load value. And, by comparing the mold load pattern signal with a pre-stored reference pattern signal to determine whether there is an abnormality in drawing molding, a press molding method. 7. The method of claim 6,
In the forming step, the load sensor unit,
In the form of a bolt, it is a piezo bolt that is coupled near the punch part or holding part of the first mold or near the die part of the second mold to measure the load value applied to the molding mold, a press molding method. 7. The method of claim 6,
In the forming step,
A method for press molding that receives a position value of the second mold elevating and lowering toward the first mold from a linear sensor unit installed in the first mold or the second mold. 9. The method of claim 8,
The forming step is
receiving the load value of the molding die from the load sensor unit and receiving the position value of the second mold from the linear sensor unit, the relationship between the position value of the second mold and the load value of the molding die a pattern signal calculation step of calculating the mold load pattern signal; and
an abnormality detection step of determining whether drawing molding is abnormal by comparing the mold load pattern signal with the reference pattern signal;
Including, a press molding method. 10. The method of claim 9,
The abnormal detection step is,
The relationship between the position value and the load value in a steady state, the relationship between the position value and the load value when the molding is defective, and the relationship between the position value and the load value when the process is abnormal are pre-defined as the reference pattern signal Calculated and stored in the, and comparing the mold load pattern signal and the reference pattern signal calculated in real time in the pattern signal calculation step to determine whether the molding defect of the sheet material to be drawn and molded or the process abnormality of the molding mold is determined, press molding method.

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