KR102532669B1 - Press forming apparatus and press forming method - Google Patents

Abstract

The present invention relates to a press forming apparatus and a press forming method capable of drawing a sheet material, and relates to a punch unit for draw forming by pressurizing at least a portion of one surface of a forming region of a sheet material, and the punch unit is installed on both sides of the punch unit to perform drawing forming. A first mold including a holding part for pressurizing and holding one side of a holding area on both sides of the forming area of the plate material when drawing forming the plate material, provided to face the first mold, and the punch part when drawing forming the plate material A second mold including a die portion supporting the other surface of the holding area of the plate material, and at least one of which is installed in the first mold or the second mold and includes the first mold and the second mold. A load sensor unit for measuring a load value applied to and when the first mold and the second mold are molded together to form the plate by drawing, the load sensor unit receives the load value applied to the forming mold in real time to obtain the A control unit may be configured to calculate a mold load pattern signal obtained by patterning the change in load value, and to compare the mold load pattern signal with a pre-stored reference pattern signal to determine whether or not there is an abnormality in drawing molding.

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 capable of draw forming a sheet material and a press forming method.

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

In such a press molding apparatus, a raw material such as a plate is provided between an upper mold and a lower mold of a forming mold mounted therein, and then presses the upper mold in close contact with the lower mold to form a product. Due to the characteristics of such a press molding device, if mass production conditions are set, the press molding device continues to operate under the same conditions. There is a quality dispersion in the products that have been sold.

However, in the conventional press molding apparatus and press molding method, it is impossible to check in real time the presence or absence of changes or abnormalities such as material deviations, process deviations, wear of molding molds, etc. during the mass production process, and defective products are visually inspected. I had a problem with checking whether or not. In addition, it is difficult to identify the cause of the defect when a defect occurs due to the confirmation of the final product and the time and cost consumption for re-establishing mass production conditions.

The present invention is to solve various problems including the above problems, and an object of the present invention is to provide a press molding apparatus and a press molding method capable of detecting molding defects in real time during a mass production process. However, these tasks are illustrative, and the scope of the present invention is not limited thereby.

According to one embodiment of the present invention, a press forming apparatus is provided. The press forming apparatus is installed on both sides of the punch unit and the punch unit for pressing and drawing at least a portion of one surface of the forming area of the sheet material, so that the punch unit draw-forming the sheet material while holding areas on both sides of the forming area of the sheet material. A first mold including a holding unit for pressing and holding one side of the; a second mold provided to face the first mold and including a die part supporting the other surface of the holding area of the plate material when the punch part draws and molds the plate material; a load sensor unit, at least one of which is installed in 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 drawn and molded, the load value applied to the forming mold from the load sensor unit is applied in real time, and a change in the load value is patterned. A control unit that calculates a signal and compares the mold load pattern signal with a pre-stored reference pattern signal to determine whether or not the drawing is abnormal.

According to one embodiment of the present invention, the load sensor unit is coupled to the vicinity of the punch portion or the holding portion of the first mold or the die portion of the second mold in the form of a bolt to be applied to the forming mold It may be a piezo bolt that measures 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 a position of the second mold moving up and down toward the first mold; may further include.

According to an embodiment of the present invention, the control unit receives the load value of the forming mold 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 forming mold may be calculated as the mold load pattern signal.

According to an embodiment of the present invention, the control unit may include a relationship between the position value and the load value in a normal state, a relationship between the position value and the load value in a molding defect, and the position value in a process abnormality. The relationship between the load 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 during drawing molding of the plate material is compared with the reference pattern signal to form defects of the plate material drawn. Alternatively, it is possible to determine whether or not the process of the forming mold is abnormal.

According to another embodiment of the present invention, a press forming method is provided. The press forming method may include a seating step of seating a plate material to be draw formed between a first mold and a second mold of a forming mold; a forming step in which the first mold and the second mold are molded together and a punch formed in the first mold presses at least a portion of one surface of a forming region of the plate member to form a drawing; And a take-out step of taking out the molded article on which drawing molding has been completed after the first mold and the second mold are opened, from the molding mold; wherein, in the molding step, the first mold and the second mold are molded together When drawing and molding the plate, the load value applied to the forming mold is applied in real time from the load sensor unit, and a mold load pattern signal obtained by patterning the change in the load value is calculated, and the mold load pattern signal and a pre-stored reference pattern By comparing the signals, it is possible to determine whether or not the drawing is abnormal.

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

According to another embodiment of the present invention, in the molding step, a position value of the second mold moving up and down toward the first mold may be applied from a 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 mold is applied from the load sensor unit and the position value of the second mold is applied from the linear sensor unit, so that the second mold a pattern signal calculating step of calculating a relationship between the position value and the load value of the forming mold as the mold load pattern signal; and an abnormality detecting step of comparing the mold load pattern signal and the reference pattern signal to determine whether or not there is an abnormality in drawing molding.

According to another embodiment of the present invention, the abnormality detecting step may include the relationship between the position value and the load value in a normal state, the relationship between the position value and the load value in a molding defect, and the relationship between the position value and the load value in a process abnormality. The relationship between the position value and the load value is previously calculated and stored 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 form the plate material to be drawn. It is possible to determine whether there is a molding defect or a process abnormality of the molding mold.

According to one embodiment of the present invention made as described above, the signal of the mold load measured through the monitoring system for detecting defects in the press molding process is patterned to detect molding defects in real time and at the same time determine the defect factors. can

Accordingly, immediate countermeasures are possible through detection of real-time molding failures and process abnormalities in the mass production press molding process, thereby improving the productivity of the press molding process and minimizing cost loss. can be implemented Of course, the scope of the present invention is not limited by these effects.

1 is a schematic cross-sectional view of a press forming apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view schematically illustrating a punch portion of a first mold of the press forming apparatus of FIG. 1 .
FIG. 3 is a cross-sectional view schematically illustrating a cross-sectional view taken along the line AA of FIG. 2 .
FIG. 4 is a table showing an example of patterning a mold load to detect molding defects in the press molding apparatus of FIG. 1 .
5 are graphs showing results of mold load analysis according to molding quality in the press molding apparatus of FIG. 1 .
6 is a flow chart showing a press molding method according to another embodiment of the present invention in order.

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

The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and the following examples may be modified in many different forms, and the scope of the present invention is as follows It is not limited to the examples. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the spirit of the invention to those skilled in the art. In addition, the thickness or size of each layer in the drawings is exaggerated for convenience and clarity of explanation.

Hereinafter, embodiments of the present invention will be described with reference to drawings schematically showing ideal embodiments of the present invention. In the drawings, variations of the depicted shape may be expected, depending on, for example, manufacturing techniques and/or tolerances. Therefore, embodiments of the inventive concept should not be construed as being limited to the specific shape of the region shown in this specification, but should include, for example, a change in shape caused by manufacturing.

1 is a schematic cross-sectional view of a press forming apparatus 100 according to an embodiment of the present invention, and FIG. 2 is a punch unit 11 of a first mold 10 of the press forming apparatus 100 of FIG. 1 It is a plan view schematically shown, and FIG. 3 is a cut cross-sectional view schematically showing a cross-sectional view taken along the cut line A-A in FIG. 2 . 4 is a table showing an example of patterning the mold load to detect molding defects in the press molding apparatus 100 of FIG. 1, and FIG. 5 is a mold according to molding quality in the press molding apparatus 100 of FIG. 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 largely includes a first mold 10, a second mold 20, and a load sensor unit 30. And, it may include a linear sensor unit 40, a control unit 50, and a main body 60 in which they are installed.

As shown in FIG. 1, the press molding apparatus 100 has a forming mold (M) on the fixed plate 61 of the main body 60 and the press ram 62 moving up and down and reciprocating toward the fixed plate 61. It may be formed in a structure that presses or hits the plate material (S) seated between the first mold 10 and the second mold 20 of the molding mold (M) by attaching.

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, and a cap press according to a structure in which the press ram 62 is raised and lowered. , The crank press, such as the press forming apparatus 100 of the present invention, by installing a driving unit on the upper part of the main body 60 and using the rotational axis of the driving unit as a crank shaft to link with the press ram 62, in the main body 60 While the press ram 62 rises and falls, the plate material S is moved between the first mold 10 of the forming mold M installed on the fixed plate 61 and the second mold 20 installed on the press ram 62. It can be pressurized and drawn. In this embodiment, although the press forming apparatus 100 is driven by a crank press structure as an example, it is not necessarily limited to this, and the above-described various driving methods capable of drawing and forming the plate material S by the forming mold M are used. can be applied

When the structure of the forming mold (M) mounted on the press forming apparatus 100 and capable of drawing and forming the plate material (S) is described in more detail, as shown in FIG. 1, the forming mold (M), A punch unit 11 fixed to the fixed plate 61 of the main body 60 and pressing at least a portion of one surface of the forming area of the plate material S to form a drawing, and the punch unit installed on both sides of the punch unit 11 (11) a first mold 10 including a holding part 12 for pressing and holding one surface of the holding area on both sides of the molding area of the plate material S when drawing and molding the plate material S and the first mold It is fixed to the press ram 62 so as to be opposed to (10), and the punch unit 11 supports the other surface of the holding area of the plate material S when drawing and forming the plate material S. Includes a die part 21 A second mold 20 may be included.

In this way, the second mold 20 is fixed to the press ram 62 that moves up and down reciprocally toward the fixed plate 61 to which the first mold 10 is fixed, so that the press ram 62 moves up and down reciprocally. Depending on the movement, it may descend toward the first mold 10 and be molded with the first mold 10, or may ascend and separate from the first mold 10 in the opposite direction. 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 die M, and the second mold 20 is a press ram 62 as an upper mold Although fixed to the example, it is not necessarily limited to this, and on the contrary, 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. may be

In addition, when the first mold 10 and the second mold 20 of the forming mold M are molded, the mold load is monitored in real time, and the measured mold load is measured so that the second mold 20 moves the first mold 10 The load sensor unit 30 and the linear sensor unit 40 may be installed in the molding mold M so as to be patterned according to the distance descending towards the direction.

At least one of the load sensor unit 30 is installed in the first mold 10 or the second mold 20, and is applied to 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 to detect the second mold 20 moving up and down toward the first mold 10. position can be measured.

More specifically, as shown in FIG. 1 , 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. .

For example, as shown in FIG. 2 , the load sensor unit 30 may be coupled to a punch plate 11b supporting the punch 11a centered on 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 in the punch plate 11b, and when a plurality of load sensors 30 are installed, they may be radially arranged 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 piezo bolt in the form of a bolt having a head portion 31 and a body 32 in which threads are formed in at least a portion of the section. 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 through the upper plate P1. A through hole H1 is formed, and a screw hole H2 having a female screw thread so that the load sensor unit 30 can be screwed to be formed at a position corresponding to the through hole H1 of the lower plate P2. .

Accordingly, the load sensor unit 30 coupled to the upper and lower plates P1 and P2 of the vertically stacked punch plates 11b presses the upper surface of the upper plate P1 with the lower surface of the head part 31. As a form, the mold load generated when the first mold 10 and the second mold 20 are molded is directly transferred to the load sensor unit 30 through the punch plate 11b, and the load sensor unit 30 Through this, the load value applied to the forming mold (M) can be measured.

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

In addition, as shown in FIG. 1, the control unit 50, when the first mold 10 and the second mold 20 are molded to draw and mold the plate material S, from the load sensor unit 30 to the molding mold ( The load value applied to M) is applied in real time, and a mold load pattern signal obtained by patterning the change in the load value is calculated, and the mold load pattern signal is compared with a previously stored reference pattern signal to determine whether or not there is an abnormality in drawing molding. can be identified.

More specifically, the control unit 50 receives the load value of the forming 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 forming mold M can be calculated as the mold load pattern signal.

For example, the controller 50 determines the relationship between the position value and the load value in a normal state, the relationship between the position value and the load value in a molding defect, and the position value and the load value in a process abnormality. The relationship is calculated and stored in advance as the reference pattern signal, and the mold load pattern signal calculated in real time during drawing molding of the plate material S is compared with the reference pattern signal to determine whether or not the molding defect of the plate material S to be drawn is formed or It is possible to determine whether or not the process of the forming mold (M) is abnormal.

As shown in (a) of FIG. 4, the mold load pattern (dotted line) when molding defects occur compared to the mold load pattern (solid line) in the normal state is stored, and the plate material (S) is drawn in real time during drawing molding. It is possible to determine whether a molding defect has occurred by comparing it with the mold load pattern signal calculated as .

In addition, as shown in (b) of FIG. 4, when the load sensor units 30 are installed on both sides, the mold load patterns (solid lines) on both sides in the normal state are compared to the both sides when material eccentricity occurs. The mold load pattern (dotted line) is stored and compared with the mold load pattern signal calculated in real time during drawing and molding of the plate material S to determine process anomalies such as eccentricity of the material.

In addition, as shown in (c) of FIG. 4, the mold load pattern (dotted line) in the case of poor lubrication compared to the mold load pattern (solid line) in the normal state is stored, and the plate material (S) is drawn in real time during drawing molding. Process anomalies such as poor lubrication can be identified by comparing this with the mold load pattern signal calculated by .

In addition, when determining a molding defect, the control unit 50 may determine the type of molding defect based on a 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 fracture or wrinkle occurs. occurred, and 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 (b) of FIG. 5, there is a clear difference in the pattern of change rate of the load value measured by the load sensor unit 30 in the normal state and when 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 molding apparatus according to an embodiment of the present invention, molding defects are detected in real time by patterning the signal of the mold load measured through the monitoring system for detecting defects in the press molding process, and at the same time, defect factors are detected. 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 molding process, thereby improving productivity of the press molding process and minimizing cost loss.

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

6 is a flow chart showing a press molding method according to another embodiment of the present invention in order.

As shown in FIG. 6, in the press forming method according to another embodiment of the present invention, the first mold 10 and the second mold 20 of the forming mold M largely draw the plate material S to be drawn. In the seating step (S10) of seating between the first mold 10 and the second mold 20, the punch unit 11 formed in the first mold 10 is formed on one surface of the molding area of the plate material S. A forming step of drawing by pressing at least a portion of the (S20) and a taking out step of taking out the molded article after drawing has been completed from the forming mold (M) after the first mold 10 and the second mold 20 are opened (S30). ) can proceed in this order.

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

More specifically, as shown in FIG. 6, in the molding step (S20), the load value of the molding mold M is applied from the load sensor unit 30, and the second mold 20 is applied from the linear sensor unit 40. A pattern signal calculation step (S21) of receiving the position value of ) and calculating the relationship between the position value of the second mold 20 and the load value of the forming mold M as the mold load pattern signal and the mold load An abnormality detection step (S22) of comparing the pattern signal and the reference pattern signal to determine whether or not the drawing is abnormal may be included.

For example, in the abnormality detection step (S22), the relationship between the position value and the load value in a normal state, the relationship between the position value and the load value in a molding defect, and the position value and the load in an abnormal process The relationship between the values 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 form defects or It is possible to determine whether or not the process of the forming mold (M) is abnormal.

Therefore, according to the press molding method according to another embodiment of the present invention, molding defects are detected in real time by patterning the signal of the mold load measured through the monitoring system for detecting defects in the press molding process, and at the same time, defect factors are detected. 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 molding process, thereby improving productivity of the press molding process and minimizing cost loss.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and 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 that presses and draws at least a portion of one surface of the forming area of the plate material, and is 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 and forms the sheet material. A first mold including a holding portion to;
a second mold provided to face the first mold and including a die part supporting the other surface of the holding area of the plate material when the punch part draws and molds the plate material;
a load sensor unit, at least one of which is installed in 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;
When the first mold and the second mold are molded and the plate material is drawn and molded, the load value applied to the forming mold from the load sensor unit is applied in real time, and the change in the load value is patterned. 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 or not the drawing is abnormal; and
A linear sensor unit installed in the first mold or the second mold to measure the position of the second mold moving up and down toward the first mold; includes,
The control unit,
The load value of the forming mold is applied from the load sensor unit and the position value of the second mold is applied from the linear sensor unit, and the relationship between the position value of the second mold and the load value of the forming mold is determined. Calculated by the mold load pattern signal,
The relationship between the position value and the load value in the normal state, the relationship between the position value and the load value in the case of defective molding, and the relationship between the position value and the load value in the case of process abnormality are pre-predicted as the reference pattern signal. , and comparing the mold load pattern signal and the reference pattern signal, which are calculated in real time during drawing molding of the plate material, to determine whether the plate material to be drawn is defective in molding or the process of the forming mold is abnormal,
The load sensor unit,
In the form of a bolt having a head portion and a body having a thread formed in at least a portion thereof, the punch plate of the first mold is coupled to a punch plate supporting the punch centered on the punch portion of the punch portion of the first mold, but the punch plate is connected to the lower surface of the head portion. Combined in the form of pressing the upper surface of, formed of a piezo bolt (Piezo Bolt) for measuring the load value applied to the forming mold, press molding apparatus. delete delete delete delete 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 together and a punch formed in the first mold presses at least a portion of one surface of a forming region of the plate member to form a drawing; and
After the first mold and the second mold are opened, a take-out step of taking out a molded article on which drawing molding has been completed from the mold; includes,
In the forming step,
When the first mold and the second mold are molded and the plate material is drawn and molded, the load value applied to the forming mold is applied in real time from the load sensor unit, and the change in the load value is patterned to calculate a mold load pattern signal and compares the mold load pattern signal with a pre-stored reference pattern signal to determine whether or not the drawing molding is abnormal, and moves up and down from the linear sensor unit installed in the first mold or the second mold toward the first mold. Receiving the position value of the second mold,
The molding step is
The load value of the forming mold is applied from the load sensor unit and the position value of the second mold is applied from the linear sensor unit, and the relationship between the position value of the second mold and the load value of the forming mold is determined. a pattern signal calculation step of calculating the mold load pattern signal; and
An abnormality detection step of comparing the mold load pattern signal and the reference pattern signal to determine whether or not there is an abnormality in drawing molding; including,
In the abnormal detection step,
The relationship between the position value and the load value in the normal state, the relationship between the position value and the load value in the case of defective molding, and the relationship between the position value and the load value in the case of process abnormality are pre-predicted as the reference pattern signal. , and compares the mold load pattern signal calculated in real time in the pattern signal calculation step with the reference pattern signal to determine whether the plate material to be drawn is defective in molding or the process of the molding mold is abnormal,
In the molding step, the load sensor unit,
It is in the form of a bolt having a head and a body with threads formed at least in part, and is coupled to a punch plate supporting the punch around the punch of the punch of the first mold, but the punch plate is connected to the lower surface of the head. Combined in the form of pressing the upper surface of, formed by a piezo bolt (Piezo Bolt) for measuring the load value applied to the molding mold, press molding method. delete delete delete delete

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