JP2005518942A - Lubricating equipment for die casting machines - Google Patents

Abstract

The device has a spraying device (10) which can be operated with a control conduit (6, 7, 8) via a control device (3), which spraying device enters the casting cylinder (18), It has a spray nozzle (15, 16) which can be introduced from a predetermined position, from which the lubricant can be distributed uniformly on the casting cylinder everywhere. The liquid lubricant is finely sprayed by the spray air, flows out from the spray nozzle (15, 16) as a mist-like conical spray body (21, 22), and is applied to the entire surface of the casting cylinder (18). Disperse uniformly. In this way, it is possible to give the casting cylinder surface, the piston and the piston ring the optimum lubrication that has not been obtained so far, so that it is possible to save up to 80% of the lubricant compared with the conventional lubrication methods. it can.

Description

  The present invention relates to an apparatus for lubricating a piston in a casting cylinder of a cold chamber die casting machine equipped with a lubricant container and a control device.

  In aluminum die casting, a pressure piston pressurizes liquid aluminum into a mold by a casting cylinder. In order to prevent premature wear of the pressure piston or even the inoperability of the piston, the mechanical movement between the pressure piston and the casting cylinder must be lubricated. This is done by dripping or spraying a liquid lubricant onto the piston or piston ring in the injection area of the pressure caster during casting pauses. During the press-in process, the piston or piston ring binds the lubricant into the casting cylinder and thus forms a lubricant film. In this process, the useless lubricant is always dripped from the pressure piston into the pressure casting machine, and the casting machine becomes extremely dirty. The lubricant adhering below the filling hole in the casting cylinder burns while generating a large amount of smoke when filling with liquid aluminum.

  Attempts have been made to avoid such disadvantages by blowing a powdered lubricant into a hot casting chamber. When filled with liquid aluminum, the flammable particles burn, while the remnants on the aluminum float, thereby forming a lubricant. However, in many cases, too much lubricant is used, and such remaining lubricant often forms undesirable inclusions in the casting.

  The object of the present invention is to avoid the disadvantages mentioned above and, in this case, to reduce the consumption of lubricant compared to the previous case, especially when the inner wall in the casting cylinder is long. And providing a lubrication device in which the lubricant is sprayed uniformly. Furthermore, as a result, the object is to extend the life of the piston ring and the piston and the life of the casting cylinder and to avoid the formation of nests in the casting. Thus, the high-load, safe places produced by new casting technology (Sicherheitsteile) are absolutely not porous.

The above problem is achieved by a device according to the superordinate concept of independent claim 1.
This device is based on liquid oil, its flammable components are at the operating temperature of the casting cylinder surface and evaporate rapidly, and its non-flammable pigment remains attached as a lubricating film on the casting cylinder surface Having a lubricant container for the lubricant,
and,
This device is equipped with a control device, this control device is used to control the supply of lubricant in the spraying device fixed to the die-casting machine and is used for pulverizing the same lubricant That
Solved by. Advantageous embodiments of the subject of the invention are described in the other claims 2-10.

    Embodiments of a lubricating device according to the present invention will be described below in detail with reference to the drawings.

  The apparatus shown in FIG. 1 comprises a lubricant container 1 for liquid lubricant, which is connected to a control device 3 by means of a supply conduit 2. A control current conduit 4 and a compressed air conduit 5 are guided in the control device. The control device 3 is connected to a spraying device 10 via conductors 6, 7, 8 and 9 which can be operated by a solenoid valve, and this spraying device is held by a rail 12 fixed to a casting cylinder of a die cast casting machine 11. Is done. The spraying device 10 has a supply pipe 14 that can reciprocate using a compressed air cylinder 13, and this supply pipe is provided with two spray nozzles 15 and 16. These spray nozzles can therefore enter and leave the casting cylinder 18 through the expanded filling opening 17 for liquid aluminum.

  During the casting pause, the piston 19 with its piston ring 20 stops at the end of the casting cylinder 18. The spray nozzles 15 and 16, which are stopped outside the casting cylinder 18 during the immediately preceding casting cycle, are only activated by the compressed air conduit 6 operated by the control device 3. The compressed air cylinder 13 then pushes the supply pipe 14 together with the spray nozzles 15 and 16 forward so that the spray nozzle 16 is located in the longitudinal axis of the casting cylinder 18. Subsequently, the transfer air is ejected from the control device 3 through the compressed air conduit 7, and the transfer air flows out through the spray nozzle 16. On the other hand, the control device 3 operates a metering pump not shown in the figure and conveys an adjustable amount of lubricant through the conduit 9 by one or many metering feeds. At this time, the pump is driven toward the spray nozzle 16 by compressed air. From the spray nozzle 16, the conical spray body 21 flows out in the longitudinal axial direction of the casting cylinder 18, and the conical spray body is scattered by the compressed air to wet the inner surface of the casting cylinder 18. After spraying the lubricant, other air is discharged by the spray nozzle 16 through the compressed air conduit 7. Subsequently, air is controlled by the compressed air conduit 8, and the air is ejected through the spray nozzle 15 perpendicular to the longitudinal axis of the casting cylinder 18. As soon as the lubricant is transferred again through the conduit 9, a small conical sprayer 22 that can be sprayed with compressed air is used to wet the inner surface of the casting cylinder 18 that is not sprayed by the conical sprayer 21. generate. Steam is generated because the inner surface of the casting cylinder 18 is heated, and this steam is released from the casting cylinder 18 by the compressed air further supplied by the spray nozzles 15 and 16. Nonflammable lubricant particles adhering to the inner surface of the casting cylinder serve to lubricate the piston 19 or piston ring 20 within the casting cylinder 18. After the release of the steam, the control device 3 stops the supply of air through the compressed air conduits 7 and 8, and the operation of the compressed air cylinder 13 in the reverse direction removes the spray nozzles 15 and 16 from the casting cylinder 18 and then the subsequent casting cycle. It can be performed. Because the lubricant is at a suitable temperature before spraying, the conduit 9 is advantageously provided with an electrical heating device 23 at its end.

  Further, as shown in FIG. 2, the spray device 10 can be fixedly provided in the casting cylinder 18 if the surrounding circumstances allow. A spray nozzle 25 built in the container 24 is fixed in the casting cylinder 18 and is formed so as to generate an asymmetric cone spray 26. In order to generate a small conical injector 27 perpendicular to the longitudinal axis of the casting cylinder 18, an opening provided substantially in this direction, ie for supplying compressed air and thereby a conical injector An air supply nozzle 28 for bypassing 26 is sufficient. In order to spray the casting cylinder 18 uniformly, the supply of compressed air can change the direction of the conical injection body 26 as a conical injection body 30 through the other opening 29 in the piston 19. it can. The fixed and built-in spray device 10 is provided for a small diameter casting cylinder, in which case the spray nozzle 25 can be further provided at an angle with respect to the longitudinal axis of the casting cylinder 18 and air The supply nozzle 28 can be provided substantially parallel to the longitudinal axis of the casting cylinder 18. The angle between the spray nozzle 25 and the air supply nozzle 28 is advantageously in the range of 90 degrees.

  The spray nozzle shown in FIGS. 3 a and 3 b has a hollow cylindrical nozzle head 31 with an outer thread 32, which screw the spray nozzle into the supply pipe 14 or into the container 24. Used to do. In the nozzle head 31, for example, a distributor 33 having eight through holes 34 is tightly shrink-fitted. A fixing screw 36 and a spray deflector 37 are screwed into the inner screw thread 35. The spray deflector 37 is interchangeable, and depending on its geometric shape, the spray deflector is used to generate various conical sprayers. The fixing screw 36 and the spray deflector 37 are provided with a central hole 38, which is used to generate an additional injection that provides the stability of the conical injector.

  With the described spray nozzle, it is possible to use a highly viscous lubricant, in which the supplied compressed air / lubricant mixture is guided by the distributor 33 to the through hole 34, through this through hole. Spraying and cooperating with the spray deflector 37 forms, for example, the conical sprayer 21 according to FIG. The additional injection made through the central hole 38 prevents the conical injector 21 from wilting earlier than expected. The spray nozzle components are all made of wear-resistant steel. Since the spray deflector 37 is formed to be replaceable by screwing, it is possible to maintain a desired conical spray body by its shaping. Therefore, by using the spray nozzle according to FIG. 4, the spray deflecting body 37 is cut off by the linear partition surface 39, and for example, the asymmetrical conical spray body 26 according to FIG. 2 is maintained. Instead of guiding the compressed air through the fixing screw 36 and the central hole 38 of the spray deflector 37, the compressed air passes through a ring duct 40 between the nozzle head 31 and the distributor 33, one or more not shown. Are guided in the central axial direction by the distributor 33 and the spray deflector 37.

It is a lubrication device equipped with a spray device in a manner in which two spray nozzles can be introduced into the casting cylinder and can be led out from the casting cylinder. It is a longitudinal cross-sectional view of the other casting cylinder in which the spraying device is fixed and incorporated in the casting cylinder. It is a longitudinal cross-sectional view of the spray nozzle on an enlarged scale. It is a cross-sectional view by the AA line of the spray nozzle of FIG. It is a deformation | transformation of the spray nozzle shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lubricant container 3 Control apparatus 6 Compressed air conduit 7 Compressed air conduit 8 Compressed air conduit 9 Lubricant conduit 10 Fixed spraying device 11 Die-casting machine 13 Compressed air cylinder 15 Spray nozzle 16 Spray nozzle 18 Cast cylinder 25 Spray nozzle 28 Air supply nozzle 31 Nozzle head 32 Outer thread 33 Distributor 34 Through hole 35 Inner thread 36 Fixing screw 37 Spray deflector 38 Central hole 39 Linear partition surface

Claims (10)

In a device for lubricating a piston in a casting cylinder of a cold chamber die casting machine,
This device is based on liquid oil, its flammable components are at the operating temperature of the casting cylinder surface and evaporate rapidly, and its non-flammable pigment remains attached as a lubricating film on the casting cylinder surface Having a lubricant container (1) for the lubricant;
and,
This device is provided with a control device (3), which is a die-cast casting machine (11).
A device characterized in that it is used to control the supply of lubricant in a spraying device (10) fixed to the same and is used to powder the same lubricant. 2. The device according to claim 1, wherein the spraying device (10) comprises at least one spray nozzle (15, 16, 25). 3. A device according to claim 2, characterized in that the spraying device (10) comprises other spray nozzles (15, 16, 25). The spray device (10) is provided with an air supply nozzle (28), which is provided at an angle with respect to the spray nozzle (15, 16, 25), preferably about 90 °. The apparatus of claim 2 characterized in that: The spraying device (10) is provided so as to be able to be introduced into the casting cylinder (18) and re-derivable using a compressed air cylinder (13) which can be operated by the control device (3), or to be fixedly cast. The device according to any one of claims 1 to 4, wherein the device is provided in the inside. Control device (3) adjustably controls the supply time of compressed air and lubricant, and at the same time a lubricant with compressed air conduit (6, 7, 8) and heating device (23) in an advantageous manner 6. The device according to claim 1, wherein the spraying time and the amount of the lubricant are controlled via the conduit (9). A spray nozzle for use in an apparatus for lubrication according to any one of claims 1-6,
The spray nozzle (15, 16, 25) has a hollow cylindrical nozzle head (31) with an outer thread (32), in which a number of through holes (34) and one inner Distributor (33) with thread (35) is shrink fitted and its inner thread is used to screw the fixing screw (36) and spray deflector (37) A spray nozzle characterized by. 8. Distributor (33) is provided with eight through holes (34), fixing screw (36) and spray deflector (37) are provided with a central hole (38). Spray nozzle. 9. Spray nozzle according to claim 7 or 8, characterized in that the replaceable spray deflector (37) is formed in various geometric shapes. 10. Spray nozzle according to claim 9, characterized in that the spray deflector (37) comprises a linear partition surface (39).

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