KR101236048B1 - Press die of adjusting the supply of lubricant for improving formability of sheet - Google Patents

Press die of adjusting the supply of lubricant for improving formability of sheet Download PDF

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Publication number
KR101236048B1
KR101236048B1 KR1020100094551A KR20100094551A KR101236048B1 KR 101236048 B1 KR101236048 B1 KR 101236048B1 KR 1020100094551 A KR1020100094551 A KR 1020100094551A KR 20100094551 A KR20100094551 A KR 20100094551A KR 101236048 B1 KR101236048 B1 KR 101236048B1
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South Korea
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die
lubricating oil
supply
lubricant
temperature
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KR1020100094551A
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Korean (ko)
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KR20120032971A (en
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홍승택
신효동
김경협
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현대제철 주식회사
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Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die for lubricating oil supply adjustment for improving sheet formability, forming a plurality of fine holes perforated on an upper surface of a die, and supplying lubricating oil between the sheet blank and the die upper surface. A die upper surface die and a die upper surface lubrication hole formed on the wall surface of the die and a die wall lubrication hole formed to supply lubricating oil between the sheet blank and the die wall surface. By controlling the friction on the wall, it is possible to improve the cold formability of high strength steel and ultra high strength steel sheet.

Description

PRESS DIE OF ADJUSTING THE SUPPLY OF LUBRICANT FOR IMPROVING FORMABILITY OF SHEET}

The present invention relates to a press die for lubricating oil supply for improving sheet formability, and to improving lubricating oil supply characteristics for a die top friction region and a die wall friction region for adjusting frictional force between a die and a die of the sheet blank, The present invention relates to a press die for lubricating oil supply that can improve cold formability of high tensile steel and ultra high strength steel sheet.

Cold press molding of high tensile strength steels, especially high strength steels of 340 MPa or more, makes it difficult to introduce the blanks. May cause In addition, even when the lubricating oil applied to the blank surface becomes uneven, fracture of the material may occur.

The friction condition of the material was a part which cannot be controlled by the surface state of the mold and the material, and was only partially controlled by adjusting the surface roughness and the press pressure.

An object of the present invention is to improve the cold formability of high tensile strength steel and ultra high strength steel by improving the lubrication characteristics in the friction region on the die top surface and the die wall, in order to control the friction force between the die and die of the sheet blank. The present invention provides a press die for adjusting lubricant supply to improve moldability.

According to the spirit of the present invention, a die upper surface lubrication hole is formed to form a plurality of fine holes perforated on the upper surface of the die, and to supply lubricating oil between the sheet blank and the die upper surface; And a die wall lubrication hole formed to form a plurality of fine holes perforated on the wall of the die and configured to supply lubricating oil between the sheet blank and the die wall surface.

At this time, the lubricating oil storage tank provided to store the lubricating oil; A lubricant transfer pipe configured to transfer lubricant from the lubricant reservoir to the die; And an internal flow path part configured to receive lubricant from the lubricant transfer pipe and supply lubricant to the die.

The inner flow passage portion may include: an upper surface flow passage formed in communication with the die to supply lubricating oil introduced from the lubricating oil transfer pipe to the die upper surface lubrication hole; And a wall flow path formed in communication with the die to supply the lubricant oil introduced from the lubricant transfer pipe to the die wall lubrication hole.

And a valve for opening and closing the supply of the lubricating oil may be provided on the connection portion of each of the lubricating oil transfer pipe and the upper surface flow path and the wall surface flow path.

And on the lubricating oil transfer pipe, a pump formed to adjust the hydraulic pressure required for the transfer of lubricating oil may be provided.

Here, the die upper surface lubrication hole and the die wall surface lubrication hole may have a circular or polygonal shape having a diameter or one side length of 1 to 10000 µm.

In addition, according to another aspect of the present invention, a die top surface lubrication is formed to form a plurality of perforated fine holes on the top surface of the die, and to supply lubricant between the sheet blank and the die top surface. hall; And a die wall lubrication hole forming a plurality of fine holes perforated on the wall of the die and configured to supply lubricant between the sheet blank and the die wall; A lubricating oil temperature control unit controlling a temperature of lubricating oil to be supplied through the die upper surface lubricating hole and the die wall lubricating hole according to the outside air temperature around the die; It provides a press die for lubricating oil supply adjustment for improving the sheet formability, comprising; a lubricating oil supply control unit for controlling the supply order and supply amount of the lubricating oil to be supplied through the die upper surface lubrication hole and the die wall lubrication hole.

At this time, the lubricating oil temperature control unit, the temperature detection unit for detecting the outside air temperature around the die; A temperature input unit configured to receive an outside temperature detected by the temperature detector; A temperature calculator configured to calculate the temperature of the lubricating oil to be supplied by comparing the input outside air temperature with a reference temperature; And a temperature controller configured to adjust a temperature of the lubricating oil to be supplied to match the heating temperature.

Here, the temperature control unit may include a heat exchanger provided to heat the lubricating oil to be supplied through heat exchange with the circulating fruit or to cool the lubricating oil to be supplied through heat exchange with the circulating refrigerant.

According to the inventors of the present invention, the press die for lubricating oil supply adjustment for improving sheet formability, while forming lubrication holes in the form of micro holes on the die upper surface and the die wall, respectively, and through such lubrication holes, the ambient environmental conditions (eg, temperature) By supplying and controlling the lubricating oil at a predetermined amount and temperature, there is an effect that can prevent the fracture due to the generation of friction during cold forming of high strength steel and ultra high strength steel.

In addition, according to the present invention, the press die for lubricating oil supply adjustment for improving the sheet formability, the blank holding force and the friction force by blocking the lubricating oil supply in the initial stage of forming the sheet blank, and supplying the lubricating oil after the intermediate step of forming the frictional force, By having a form that can be controlled at the same time, there is an effect that can be further improved cold formability.

1 is a schematic illustration of a sheet blank cold press die,
2 is a view schematically showing a press die for lubricating oil supply for improving sheet formability according to a first embodiment of the present invention;
3 is a view schematically showing a press die for adjusting lubricant supply for improving sheet formability according to a second embodiment of the present invention;
Figure 4 is a schematic view showing the top and wall shape of the press die for lubricating oil supply adjustment for improving sheet formability according to the present invention,
5 is a view showing an exemplary shape of the inner flow path in the press die for adjusting the lubricant supply for improving sheet formability according to the present invention,
6 is a view showing another exemplary shape of the inner flow path in the press die for adjusting the lubricant supply for improving sheet formability according to the present invention,
7 is a view showing a shape having an operation switch on the press die for lubricating oil supply for improving sheet formability according to the second embodiment of the present invention.

Hereinafter, a press die for adjusting lubricant supply for improving plate formability according to an exemplary embodiment of the present invention will be described.

Brief Description of the Drawings The advantages and features of the present invention, and how to accomplish them, will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings.

The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

Before describing the preferred embodiment of the press die for lubricating oil supply control for improving sheet formability according to the present invention, the sheet blank cold press die will be briefly described.

1 is a schematic illustration of a sheet blank cold press die.

The thin sheet blank B is cold formed between the die D and the holder H. At this time, the friction condition of the thin plate blank B on the die upper surface D1 and the die wall surface D2 is a difficult part to control. The inflow of blanks is difficult to achieve.

In particular, the forming board is changed due to the stretching occurs during drawing on the die wall (D2), thereby causing the fracture of the material due to the reduction in thickness.

2 is a view schematically showing a press die for lubricating oil supply control for improving sheet formability according to a first embodiment of the present invention, and FIG. 3 is a sheet formability improvement according to a second embodiment of the present invention. Figure schematically shows a press die for adjusting the lubricant supply for.

2 and 3 clearly clarify only the main features in order to conceptually clearly understand the present invention, and as a result, various modifications of the drawings are expected, and the scope of the present invention is limited by the specific shapes shown in the drawings. There is no need to be limited.

In addition, the second embodiment of the present invention shown in FIG. 3 further includes a function of controlling the temperature and flow rate conditions of the lubricating oil to be supplied through the lubricating hole as compared to the first embodiment shown in FIG. The rest of the configuration can be said to be the same as in the first embodiment. Hereinafter, the first and second embodiments according to the present invention will be described in detail.

First Embodiment

With reference to Figure 2 will be described a press die for lubricating oil supply for improving the sheet formability according to the first embodiment of the present invention.

As shown, the first embodiment of the present invention forms a plurality of fine holes perforated on the upper surface of the die, and the die upper portion is formed to supply lubricant between the sheet blank and the die upper surface. It comprises a surface lubrication hole 102 and a die wall lubrication hole 104 formed to form a plurality of fine holes perforated on the wall of the die, and to supply lubricant between the sheet blank and the die wall surface.

Thus, the lubricating oil storage tank 119, the lubricating oil transfer pipe 105c, and the internal flow path portion 105 further comprises.

The die upper surface lubrication hole 102 is formed to form a plurality of fine holes perforated in the upper surface of the die D to supply and regulate the lubricating oil during cold press molding, and the die wall lubrication hole 104 is formed of a die ( A plurality of perforated fine hole shapes are formed in the wall surface of D), and are formed to supply and regulate the lubricating oil during cold press molding.

The shape of each die top lubrication hole 102 and die wall lubrication hole 104 may have the same shape and arrangement, as shown in FIGS. 4A and 4B, but the shape and The present invention is not limited to the arrangement form, and may be modified in various forms.

In this embodiment, as a preferable shape of the die upper surface lubrication hole 102 and the die wall lubrication hole 104, a circular or polygonal shape having a diameter or one side length of 1 to 10000 m can be used.

The lubricating oil storage tank 119 is a container-shaped member for storing and storing lubricating oil to be supplied between the die D and the sheet blank through the die upper surface lubricating hole 102 and the die wall lubricating hole 104.

However, although not separately illustrated, the lubricating oil storage tank 119 may have an integral shape that forms a lubricating oil storage space provided separately inside the die D, instead of being provided outside the die D.

A lubricant transfer pipe 105c is formed between the lubricant reservoir 119 and the die D to enable the transfer of the required lubricant.

At the end of the lubricating oil transfer pipe 105c, it may have a pipe form branched so as to be connected to the internal flow path 105 inside the die formed by the die upper surface lubrication hole 102 and the die wall lubrication hole 104, respectively. have.

And each of the valves (116a, 116b) may be provided on the branched pipe, thereby, the opening and closing adjustment function for the supply of lubricating oil can be implemented.

5 and 6, the internal flow path 105 is connected to the branched pipe at the end of the above-described lubricant transfer pipe 105c, so that the supplied lubricant oil can be It refers to the lubricating oil supply passage inside the die (D) for conveying through the different flow path to the surface lubrication hole 102 and the die wall lubrication hole (104).

That is, the internal flow path portion 105 includes an upper surface flow passage 105a communicating with the inside of the die D so as to supply the lubricating oil introduced from the lubricating oil transfer pipe 105c to the die upper surface lubrication hole 102. Each of the wall flow paths formed in communication with each other of the die D may be included to supply the lubricant oil introduced from the lubricant transfer pipe 105c to the die wall lubrication hole 104.

This is a form for independently supplying the lubricating oil to the die upper surface lubrication hole 102 and the die wall lubricating hole 104, and can supply the lubricating oil at the same time or with a certain time difference therebetween.

And on the lubricating oil transfer pipe 105c, a pump 118 formed to adjust the hydraulic pressure required for the transfer of the lubricating oil may be provided. Such a pump 118 is not necessarily a necessary configuration when actually manufacturing a press die for lubricating oil supply adjustment for improving sheet formability according to the present invention, but smoothly supplying lubricating oil to the upper surface of the die lubrication hole 102. It plays an important role in getting things done.

As a result, the lubricant can be properly supplied from the upper surface of the die (D) and the friction surface of the wall, thereby preventing breakage of the sheet blanks due to friction, and furthermore, in the initial stage of cold press molding, From the middle of the cold press molding, it is possible to improve the moldability of the high-strength sheet blank by adjusting to supply the lubricant appropriately.

Second Embodiment

With reference to Figure 3 will be described a press die for lubricating oil supply for improving the sheet formability according to the second embodiment of the present invention.

Here, the second embodiment of the present invention shown in FIG. 3 further includes a function of controlling the temperature and flow rate conditions of the lubricating oil to be supplied through the lubricating hole as compared to the first embodiment described above. The configuration can be said to be the same as in the first embodiment.

Therefore, unnecessary redundant descriptions of the components described in the first embodiment will be omitted, and only the components added compared to the first embodiment will be described in detail.

Referring to FIG. 3, a configuration of the lubricant temperature control unit 120 and the lubricant supply control unit 140 is disclosed.

The lubricating oil temperature control unit 120 plays a role of controlling the temperature of the lubricating oil to be supplied through the die upper surface lubrication hole 102 and the die wall lubrication hole 104 according to the external air temperature state around the die D. .

The lubricating oil supply control unit 140 plays a role of controlling the supply order and supply amount of the lubricating oil to be supplied through the die upper surface lubricating hole 102 and the die wall lubricating hole 104.

The lubricating oil temperature controller 120 includes a temperature detector 122 that detects the outside air temperature around the die D, a temperature input unit 124 that receives the outside air temperature detected by the temperature detector 122, and an inputted outside air. Comparing the temperature with the reference temperature, the temperature calculation unit 126 for calculating the temperature of the lubricant to be supplied, and the temperature controller 128 for adjusting the temperature of the lubricant to be supplied to match the calculated temperature.

The lubricating oil supply control unit 140 includes a pump control unit 144 for controlling the amount of lubricating oil drawn out from the lubricating oil storage tank 119, and the lubricating oil extracted from the lubricating oil storage tank 119, respectively, for each die upper surface lubrication hole 102. And a valve control unit 142 for regulating the flow to be supplied to the die wall lubrication hole 104.

Depending on the season (especially winter), the external environmental conditions (especially temperature) during cold press molding may change, and thus the possibility of breakage of the material may vary. Referring to FIG. 3, as shown in FIG. One side is provided with a temperature sensor 129 detects the temperature around the die during the cold press operation.

The ambient temperature of the die D (hereinafter, referred to as 'outside temperature') detected by the temperature sensor 129 is input to the temperature input unit 124.

The input outside air temperature is compared with the reference temperature in the temperature calculator 126, and then the temperature of the lubricating oil to be supplied is calculated. Thereafter, the temperature of the lubricating oil may be adjusted according to the calculated temperature value. To provide such a function, the temperature adjusting unit 126 of the present invention heats the lubricating oil to be supplied through heat exchange with the circulating fruit or heat exchange with the circulating refrigerant. A heat exchanger 150 for cooling the lubricating oil to be supplied may be further provided.

The heat exchanger 150 is preferably installed on the lubricating oil supply pipe 105c, but such an installation position also does not limit the present invention, and may be slightly differently applied through various embodiments.

FIG. 7 is a view illustrating a shape including an operation switch on a press die for lubricating oil supply for improving sheet formability according to a second embodiment of the present invention, and for transmitting a user command to the lubricating oil temperature controller 120. It can be seen that the operation switch 170 is further provided.

The operation switch 170 may include a predetermined display unit 172 through which input commands and information corresponding thereto may be checked, and a plurality of function keys 174 through which commands may be input from a user. As a result, user convenience can be improved.

As described above, according to the present invention, the press die for lubricating oil supply for improving sheet formability can be provided with lubricating holes in the form of micro holes on the die upper surface and the die wall, respectively, and through the lubricating holes. : By supplying and controlling the lubricating oil at the set amount and temperature according to the temperature), it is possible to prevent the fracture due to the generation of friction during cold forming of high strength steel and ultra high strength steel.

In addition, by lubricating oil supply at the initial stage of forming the sheet blank and lubricating oil supply after the intermediate step of forming the friction force, the cold holding property can be further improved as the blank holding force and friction force can be controlled simultaneously. We can plan.

In the above, the press die for lubricating oil supply for improving sheet formability according to the present invention has been described.

It is to be understood that the above-described embodiments are illustrative in all aspects and should not be construed as limiting, the scope of the invention being indicated by the appended claims rather than the foregoing description, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

H: Holder
D: press die
B: sheet blank
102: die top lubrication hole
104: Die wall lubrication hole
105: internal flow path
116a, 116b: valve
118: pump
119: lubricant reservoir
120: lubricant temperature control unit
122: temperature detector
124: temperature input
126: temperature calculator
128: temperature controller
129: temperature sensor
140: lubricant supply control unit
142: valve control unit
144: pump control unit
150: heat exchanger
170: operation switch

Claims (13)

Forming a plurality of fine holes perforated on the upper surface of the die, the die upper surface lubrication hole formed to supply lubricating oil between the sheet blank and the upper surface of the die, and a plurality of perforated holes on the wall surface of the die A lubricating oil reservoir configured to store the lubricating oil, the die wall lubricating hole formed to supply lubricating oil between the sheet blank and the die wall, and the lubricating oil conveying pipe formed to transfer the lubricating oil from the lubricating oil storage tank to the die. And an internal flow path part configured to receive lubricant from the lubricant transfer pipe and supply lubricant to the die.
The inner flow passage portion may be configured to supply an upper surface flow path formed in communication with the die to supply lubricating oil introduced from the lubricating oil conveying pipe to the die upper surface lubrication hole, and to supply lubricating oil introduced from the lubricating oil conveying pipe to the die wall lubricating hole. Press die for adjusting the lubricant supply for improving sheet formability, characterized in that it comprises a wall passage formed in communication with the die.
delete delete The method of claim 1,
Press valve for lubricating oil supply adjustment for improving the sheet formability, characterized in that each valve for opening and closing the supply of lubricating oil is provided on the connection portion between the lubricating oil transfer pipe and the upper surface flow path and the wall surface flow path.
The method of claim 1,
On the lubricating oil transfer pipe,
Press die for lubricating oil supply adjustment for improving sheet formability, characterized in that the pump is formed to adjust the hydraulic pressure required for the transfer of lubricating oil.
The method of claim 1,
The die upper surface lubrication hole and the die wall lubrication hole,
Press die for adjusting the lubricant supply for improving sheet formability, characterized in that the circular or polygonal shape having a diameter or one side length of 1 to 10000㎛.
Forming a plurality of fine holes perforated on the upper surface of the die, the die upper surface lubrication hole formed to supply lubricating oil between the sheet blank and the upper surface of the die, and a plurality of perforated holes on the wall surface of the die A die wall lubrication hole formed to supply fine oil between the sheet blank and the die wall surface, and the lubricant to be supplied through the die upper surface lubrication hole and the die wall lubrication hole according to the ambient air temperature around the die. A lubricating oil storage tank including a lubricating oil temperature control unit for controlling a temperature, a lubricating oil supply control unit for controlling a supply order and a supply amount of the lubricating oil to be supplied through the die upper surface lubricating hole and the die wall lubricating hole; A lubricant transfer pipe configured to transfer lubricant from the lubricant reservoir to the die, and the lubricant transfer An internal flow path portion configured to receive lubricant from a pipe and supply lubricant to the die;
The inner flow passage portion may be configured to supply an upper surface flow path formed in communication with the die to supply lubricating oil introduced from the lubricating oil conveying pipe to the die upper surface lubrication hole, and to supply lubricating oil introduced from the lubricating oil conveying pipe to the die wall lubricating hole. Press die for adjusting the lubricant supply for improving sheet formability, characterized in that it comprises a wall passage formed in communication with the die.
The method of claim 7, wherein
The lubricant oil temperature control unit,
A temperature detector for detecting an outside air temperature around the die;
A temperature input unit configured to receive an outside temperature detected by the temperature detector;
A temperature calculator configured to calculate the temperature of the lubricating oil to be supplied by comparing the input outside air temperature with a reference temperature; And
Press die for lubricating oil supply control for improving the sheet formability, comprising a; temperature control unit for adjusting the temperature of the lubricating oil to be supplied to match the calculated temperature.
The method of claim 8,
The temperature control unit,
A press die for lubricating oil supply adjustment for improving sheet formability, comprising: a heat exchanger provided to heat lubricating oil to be supplied through heat exchange with circulating fruit or to cool lubricating oil to be supplied through heat exchange with circulating refrigerant.
delete delete The method of claim 7, wherein
Each valve for opening and closing the supply of lubricating oil is provided on the connection portion between the lubricating oil transfer pipe and the upper surface flow path and the wall flow path.
Each of the valves is a solenoid valve for opening and closing controlled by the command of the electrical signal of the lubricant supply control unit for lubricating oil supply adjustment for improving sheet formability.
The method of claim 7, wherein
On the lubricating oil transfer pipe,
The pump is provided to adjust the hydraulic pressure required for the transfer of lubricating oil,
The pump is a die for controlling the lubricant supply for improving the sheet formability, characterized in that the drive is controlled by receiving an electrical signal from the lubricant supply control unit.
KR1020100094551A 2010-09-29 2010-09-29 Press die of adjusting the supply of lubricant for improving formability of sheet KR101236048B1 (en)

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KR101236048B1 true KR101236048B1 (en) 2013-02-21

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Publication number Priority date Publication date Assignee Title
KR101424864B1 (en) * 2012-05-30 2014-07-31 현대제철 주식회사 Apparatus for forming work material having a lubricant oil supply unit

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR940009404B1 (en) * 1992-11-18 1994-10-13 이복석 Making process of a catapult mold
JP2005169394A (en) * 2003-10-02 2005-06-30 Nippon Steel Corp Apparatus and method for hot press working of metal plate
KR20060115083A (en) * 2005-05-04 2006-11-08 현대자동차주식회사 Guide post device for press die
JP2009079583A (en) * 2007-09-06 2009-04-16 Aisin Seiki Co Ltd Operating method of lubricating device for internal combustion engines, and lubricating device for internal combustion engines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR940009404B1 (en) * 1992-11-18 1994-10-13 이복석 Making process of a catapult mold
JP2005169394A (en) * 2003-10-02 2005-06-30 Nippon Steel Corp Apparatus and method for hot press working of metal plate
KR20060115083A (en) * 2005-05-04 2006-11-08 현대자동차주식회사 Guide post device for press die
JP2009079583A (en) * 2007-09-06 2009-04-16 Aisin Seiki Co Ltd Operating method of lubricating device for internal combustion engines, and lubricating device for internal combustion engines

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