EP2789397A1 - Workpiece oiler and method for oiling of workpieces - Google Patents

Abstract

The invention relates to a workpiece oiler for soldering workpieces (W) with at least one spray device (10) for dispensing lubricant and at least one baffle (20) for deflecting the lubricant jet (S) and / or atomizing the lubricant and a collecting and discharging collecting means of excess lubricant. Furthermore, the invention relates to a method for oiling workpieces (W) before punching and / or forming with the steps: Arranging at least one spraying device (10); Spraying a baffle (20) with the at least one spray device (10); Arranging the workpiece at least partially in the region of the deflected spray jet and / or at least partially in the region of deflected droplets; and Removal of excess lubricant.

Description

The present invention relates to a workpiece lubricator for oiling workpieces and a method for lubricating workpieces to reduce the friction on a stamping, deep drawing or forming tool.

In a forming or stamping process, a workpiece such as a coil or board must be wetted with a greasing or drawing and forming oil prior to machining to reduce friction in the subsequent forming and stamping process. As a result, on the one hand, the quality of the stamped and formed components is increased and on the other hand, the life of the punching and forming tools is increased.

For this purpose, according to the prior art, contact lubricators and contactless lubricators exist. Kontaktbeöler usually have felt or brush rollers. In contactless lubrication systems, the drawing and forming oil is sprayed onto the workpiece. In order to apply a uniformly thin film of oil to the workpiece, the systems on the market operate with so-called dual-fluid nozzles, which generate a mist of compressed air and the lubricating oil. Excess fog volume must be extracted via suction devices in order to prevent too much oil mist from entering the environment.

The object is to provide a novel device for the metered application of forming oil or a Befettungsmittels on workpieces and a corresponding method, which means a uniform lubricating film by means of a simple device can be produced on the workpiece.

This object is solved by the features of the independent claims. Advantageous developments are defined in the dependent claims.

According to one aspect, a workpiece lubricator is provided for lubricating workpieces having at least one spray device for dispensing lubricant and at least one baffle for deflecting the lubricant jet and / or atomizing the lubricant and a collecting means for collecting and removing excess lubricant. The spraying device preferably has at least one spray nozzle, the outlet cross-section of which may be, for example, circular or rectangular.

According to the invention, the greasing agent is applied indirectly to the workpiece by the spray jet is guided and / or reflected on a specially designed surface or wall or baffle. In this case, only a small part of the spray jet is applied to the workpiece, while a large part of the spray jet is discharged via a collecting means and / or a channel laterally from the workpiece. The discharged amount of Befettungsmittels or forming oil can be recycled to the process.

Due to the reflection of the spray jet on the deflection surface or a baffle smallest liquid droplets are generated. As a result, the one-fluid nozzle technique can be used, in which only the spray oil is discharged from the spray device. The generation of a mist by means of compressed air (so-called two-fluid nozzle) can therefore be avoided.

Since an excess amount of lubricant can be removed, the cross section of the discharge opening of the spraying device need not be adapted to the shape of the workpiece. Nevertheless, application of a very thin and even oil film with a minimum amount is particularly desirable Micro components possible.

Preferably, the at least one spray device, the baffle and the collecting means are housed in a common chamber. More preferably, the collecting means comprises at least one gutter.

Preferably, the baffle is disposed opposite a workpiece surface at an angle of about 60 ° to about 120 °.

Preferably, the at least one spraying device is arranged and / or pivotable relative to a workpiece surface at an angle of approximately 30 ° to approximately 70 °.

By pivoting the spray device with respect to the angle of impact on the baffle, the wetting of the workpiece can be selectively controlled. In addition, an angle of the baffle with respect to the workpiece surface can be changed and / or the shape or design of the baffle to optimize the wetting. The baffle may be formed instead of a closed surface as a perforated plate to vary the amount of reflected liquid droplets can. Further, the ejection of the spray device can be changed, in particular on the applied pressure, the frequency or timing and / or the opening times of the spray nozzle.

By suitably setting these parameters, an optimum result can be achieved, in particular by using a single-fluid nozzle. The use of a two-fluid nozzle for atomizing the forming oil and a complex extraction of the mist produced is thus not required.

More preferably, only about 10% to about 20% of the lubricant dispensed by the at least one spray device is applied to the workpiece and the excess lubricant is removed via the collecting means. As a result, a very thin and uniform lubricating film is applied to the workpiece become.

Preferably, the spray device is a single-fluid nozzle and / or the nozzle is subjected to a pressure of about 300 kPa to about 600 kPa.

Preferably, the spray device produces a substantially elliptical or rectangular spray pattern and / or the nozzle has a nozzle exit angle of about 40 ° to about 140 °, in particular about 110 ° to about 120 °.

• Anordnen zumindest einer Sprühvorrichtung;
• Besprühen eines Ablenkblechs oder einer Wand oder dergleichen mit der zumindest einen Sprühvorrichtung;
• Anordnen des Werkstücks zumindest teilweise im Bereich des abgelenkten Sprühstrahls und/oder zumindest teilweise im Bereich abgelenkter Tröpfchen; und
• Abführen von überschüssigem Schmiermittel.

In another aspect, a method of oiling workpieces prior to stamping and / or forming is provided by the steps of:

• Arranging at least one spraying device;
• Spraying a baffle or wall or the like with the at least one spray device;
• Arranging the workpiece at least partially in the region of the deflected spray jet and / or at least partially in the region of deflected droplets; and
• Removal of excess lubricant.

Preferably, the workpiece is further moved continuously or intermittently through the deflected fluid rain to apply a uniform thin fluid film.

• Fig. 1 zeigt eine perspektivische Ansicht eines Werkstückbeölers gemäß einem ersten Ausführungsbeispiel.
• Fig. 2 zeigt eine Schnittansicht des Werkstückbeölers von Fig. 1.
• Fig. 3 zeigt eine Schnittansicht eines Werkstückbeölers gemäß einem zweiten Ausführungsbeispiel.
• Fig. 4 zeigt eine perspektivische Ansicht des Werkstückbeölers von Fig. 3.

The invention will now be explained in more detail by means of embodiments with reference to the accompanying drawings.

• Fig. 1 shows a perspective view of a Werkstückbeölers according to a first embodiment.
• Fig. 2 shows a sectional view of the Werkstückbeölers of Fig. 1 ,
• Fig. 3 shows a sectional view of a Werkstückbeölers according to a second Embodiment.
• Fig. 4 shows a perspective view of the Werkstückbeölers of Fig. 3 ,

As in Fig. 1 and 2 2, a workpiece W is introduced via an insertion slot 42 into a chamber 40 to be coated within the chamber 40 with the spray oil or greasing agent. As a workpiece W is in Fig. 1 and 2 shown a tape which is introduced via the insertion slot 42 and led out after the oiling via an exit slot 44 from the chamber 40. By passing a band material (workpiece W) of constant configuration through the chamber 40, a continuous oiling operation can be advantageously performed. For example, strip material to be processed having a longitudinally varying configuration may preferably be sprayed discontinuously.

The workpiece W can also be moved in its direction of movement of the Ausführschlitz 44 to the insertion slot 42.

However, any other workpiece W, such as a board or the like, within the chamber 40 may also be coated with spray oil.

Within the chamber 40 according to the embodiment, a pair of spray devices 10, 10 are arranged, a spray device 10 above the workpiece W and a spray device 10 below the workpiece W. The whole in Fig. 1 However, the arrangement shown can also be rotated by 90 °, so that the band is aligned as a workpiece W with its width along the vertical. In this case, one of the sprayers 10 would be located on the right side and one of the sprayers 10 on the left side of the belt.

According to the in Fig. 1 However, in the embodiment shown, the width of the belt is substantially along the horizontal so that one of the sprayers 10 is located above the belt and one of the sprayers 10 is below the belt. It is understood that several too Spray devices 10 can be arranged above and below the band or to the right and left thereof.

Preferably, each of the sprayers 10, 10 is pivotable so that by adjusting the pivoting angle of the sprayers 10, 10, a coating of the workpiece W with the forming oil can be controlled to achieve optimum results.

Within the chamber 40, a deflection surface or wall or a baffle 20 is also arranged. This baffle 20 is disposed opposite the surface of the workpiece W at an angle of about 60 ° to about 120 °. In the in Fig. 1 In the embodiment shown, the baffle 20 is arranged substantially perpendicular to the surface of the workpiece W. This baffle 20 is sprayed directly with the spray device 10 by means of the spray jet S with forming oil. By reflection of the spray jet S finest droplets of liquid are generated, which are reflected on the located in the vicinity of the reflected spray jet S workpiece W.

In this case, however, a large part of the spray jet S is received by a first gutter 30, which is arranged inclined relative to the horizontal, to direct the largest part of the spray jet S laterally on the workpiece W and drain into a bottom portion of the chamber 40. In other words, the largest part of the spray jet S is taken up by the first drainage channel 30 and diverted via its inclination relative to the horizontal into a region below the workpiece W.

The derived forming oil can be returned to the process after any filtering. Thus, the workpiece W is wetted only directly by the finest reflected droplets of the spray jet S with a liquid or fluid film of the forming oil. In this way, even with a relatively large spraying device 10, a minimal and very thin fluid film can be applied to the workpiece W. This is especially true in the micromachining of Small components and in electrical engineering of great advantage because the forming oil after the forming or punching process must be removed again and beyond a too thick fluid film can adversely affect the punching and / or forming process.

Preferably, a portion of the baffle 20 facing the first downcomer 30 is formed as an angled portion 22 facilitating delivery of most of the spray oil into the first downcomer 30, for example, by adhesion of the spray oil to the surface of the baffle 20 and its angled portion 22 ,

More preferably, in the region of the insertion slot 42, a second drainage channel 32 is arranged, which prevents leakage of fluid from the chamber 40 and is also inclined relative to the horizontal in order to discharge the absorbed fluid to a bottom portion of the chamber 40.

The baffle 20 and the first drainage channel 30 are more preferably in the region of the outlet slot 44. In this way, the reflected part of the spray jet S is applied to the workpiece W substantially in a central portion of the chamber 40.

The spray device 10 is preferably pivotable at an angle of about 30 ° to about 70 ° with respect to a surface of the workpiece W. By setting an appropriate angle within said range, a fluid film applied to the workpiece surface can be optimized.

Further optimization of the fluid film is accomplished by adjusting the fluid pressure of the spray device 10 in the range of about 300 kPa to about 600 kPa.

In this way, the fluid film can be optimized by adjusting the angle of the baffle 20 in the range of about 60 ° to about 120 ° and the pivoting angle of the spray device 10 in the range of about 30 ° to about 70 ° and by adjusting the pressure of the spray device 10 in said pressure range.

The spraying device 10 is preferably a single-fluid nozzle which supplies only the fluid without mixing compressed air or another gas, and moreover, it is preferably a flat jet nozzle capable of generating an elliptic or rectangular spray pattern. Depending on the nature of the workpiece W to be oiled, however, it is also possible to use a different nozzle, for example a pin nozzle, hole nozzle, multiple-hole nozzle or the like.

The spray nozzle of the spray device 10 and / or the spray device 10 per se can also be designed to be rotatable. The plane of rotation is perpendicular to the spray direction. With a rectangular configuration of the spray nozzle, the elliptical or rectangular spray pattern can be pivoted by a corresponding rotation, with the result that the horizontal extension of the spray pattern can be reduced and the vertical extent of the spray pattern can be increased. This is particularly advantageous if different workpieces W are to be processed with the proposed workpiece oiler.

In the FIGS. 3 and 4 a second embodiment is shown. This embodiment differs from that in the FIGS. 1 and 2 shown embodiment by arranging a third drainage channel 34, which may have a closed surface or may be configured as a perforated plate, which is arranged substantially in a central region of the chamber 40. By arranging this third gutter 34, the amount of fluid applied can be further minimized. In addition, leakage of fluid through the insertion slot 42 can be better prevented.

The gutter 34 may be provided above and as a further gutter 34 also below the workpiece W in the form of a room divider and extend substantially over the entire width of the chamber 40 and from the bottom or the ceiling of the chamber 40 to just before the workpiece W. This can do that

Space volume for reflected liquid droplets are limited.

Furthermore, according to the second embodiment, the baffle 20 is formed integrally with the first drainage channel 30. Also, the baffle 20 with the gutter 30 may be part of the chamber wall or the chamber wall serve as a baffle on which a drainage channel 30 is additionally mounted or formed. As a result, the number of components can be reduced and a size of the chamber 40 can also be reduced.

Otherwise, the second embodiment of the FIGS. 3 and 4 just like the first embodiment of FIGS. 1 and 2 constructed so that the components of the second embodiment shown with the same reference numerals are constructed as well as those of the first embodiment and also act accordingly.

LIST OF REFERENCE NUMBERS

10

sprayer

20

baffle

22

angled section

30

first gutter

32

second gutter

34

third gutter

40

chamber

42

insertion

44

exit slot

S

spray

W

workpiece

Claims (10)

Workpiece oiler for lubricating workpieces (W) with at least one spray device (10) for dispensing lubricant and at least one baffle (20) for deflecting the lubricant jet (S) and / or atomizing the lubricant and a collecting means for collecting and removing excess lubricant. A workpiece lubricator according to claim 1, wherein the at least one spray device (10), the baffle (20) and the collecting means are housed in a common chamber (40). Workpiece lubricator according to one of the preceding claims, wherein the collecting means comprises at least one drainage channel (30, 32, 34). Workpiece lubricator according to one of the preceding claims, wherein the baffle (20) is arranged with respect to a workpiece surface at an angle of about 60 ° to about 120 °. Workpiece lubricator according to one of the preceding claims, wherein the at least one spraying device (10) is arranged opposite to a workpiece surface at an angle of about 30 ° to about 70 ° and / or is pivotable. A workpiece lubricator according to any one of the preceding claims, wherein about 10% to about 20% of the lubricant dispensed by the at least one spray device (10) is applied to the workpiece (W) and the excess lubricant is removed via the collecting means. Workpiece lubricator according to one of the preceding claims, wherein the spraying device (10) is a single-substance nozzle and / or with a pressure of about 300 kPa to about 600 kPa is applied. Workpiece lubricator according to one of the preceding claims, wherein the spray device (10) generates a substantially elliptical or rectangular spray pattern and / or the nozzle has a nozzle exit angle of about 40 ° to about 140 °, in particular about 110 ° to 120 °. Method for oiling workpieces (W) before punching and / or forming with the steps: Arranging at least one spraying device (10); Spraying a baffle (20) with the at least one spray device (10); Arranging the workpiece at least partially in the region of the deflected spray jet and / or at least partially in the region of deflected droplets; and Removal of excess lubricant. The method of claim 9, further comprising the step of continuously or discontinuously moving the workpiece (W).

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