JP2005232548A - Oil-quenching apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil-quenching apparatus which can reduce the amount of quenching oil stuck to a treated article and a basket for holding the treated article, etc. after oil-quenching and extracted outside a quenching chamber. <P>SOLUTION: In the oil-quenching apparatus, the quenching chamber 3 with an oil vessel 5 thereunder for storing the quenching oil 6 is provided successively to a heating chamber 2 through a partition door 4 and treating article W heated in the heating chamber 2 is dipped into the quenching oil 6 in the oil vessel 5 and oil-cooled, and the oil-quenching apparatus is provided with an inert gas supplying device and a plurality of gas-blowing nozzles 60 which are connected to the inert gas supplying device, arranged at the inside position of an inlet/outlet door 7 in the quenching chamber 3, and direct spouting holes to the treating article W extracted from the quenching chamber 3 after oil-quenching so as to jet the inert gas to the treating article W. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an oil quenching apparatus that heats a processed metal product such as a steel material and then cools it by immersing it in quenching oil.

In general, in the vacuum oil quenching method in which processed products such as steel mechanical parts and molds are hardened and hardened, the processed products are heated to a predetermined temperature under reduced pressure in the heating chamber and then placed in the heating chamber adjacent to the heating chamber. Immerse in quenching oil in the oil tank and cool. The treated product after oil cooling (cooling by immersion in oil) is extracted into the quenching chamber and then extracted as it is outside the quenching chamber. Extract. (For example, refer to Patent Document 1).
JP-A-8-67909 (page 2-3, FIG. 1)

  However, among the above quenching methods, there are many cases in which the treated product after oil cooling is extracted from the oil into the quenching chamber and then extracted as it is outside the quenching chamber, and usually a large number of treated products are baskets etc. at once. Heating and cooling is performed in a state of being contained in the storage room, so that a large amount of the hardened oil adhering to the processed product extracted from the quenching chamber and the basket etc. is received and conveyed on the floor surface outside the entrance and exit of the quenching chamber and the processed product. Drop it on the device and so on to stain the floor. For this reason, since the worker manually cleans the floor surface etc., it takes time and is not preferable for the operator's hygiene, and the oil adheres to the worker and the apparatus in the subsequent process following quenching. In order to prevent this, it is necessary to clean the oil adhered to the treated product and the basket, and this cleaning is troublesome.

  The present invention is intended to solve the above-mentioned conventional problems, and reduces the amount of quenching oil that is attached to a treated product after oil quenching or a basket containing the treated product and extracted to the outside of the quenching chamber. It is an object of the present invention to provide an oil quenching apparatus that can be made into an oil.

  In order to achieve the above object, the oil quenching apparatus according to claim 1 comprises a quenching chamber having an oil tank for storing quenching oil in a lower part, connected to a heating chamber via a partition door, In the oil quenching apparatus that cools the processed product heated in the heating chamber by immersing it in the quenching oil in the oil tank, and connected to the inert gas supply apparatus and the inert gas supply apparatus, after the oil cooling A plurality of gas spray nozzles disposed at positions inside the entrance door of the quenching chamber so that an inert gas is sprayed onto the treated product extracted from the quenching chamber. Features.

  According to the means of claim 1, a basket or the like for storing a processed product or a processed product by spraying an inert gas from an outlet of a gas spray nozzle onto a processed product extracted from the quenching chamber after oil cooling ( Including the hanger for supporting the treated product (hereinafter collectively referred to as treated product, etc.), the quenching oil adhering to the treated product is separated and removed and collected in the quenching chamber, and adheres to the treated product and the quenching oil. Is suppressed from being extracted outside the quenching chamber.

  In the present invention, the plurality of gas spray nozzles can be installed in an arbitrary arrangement at the inside position of the entrance door of the quenching chamber. If the configuration is arranged on a vertical plane orthogonal to the moving direction at the time of extraction of the processed product, the inert gas is simultaneously applied to the upper and lower parts on the vertical surface of the processed product passing through the gas spray nozzle arrangement unit. As a result, the hardened oil separated and removed from the upper part of the treated product is prevented from dripping and reattaching to the lower part of the treated product from which the hardened oil has been removed. The quenching oil can be separated and removed without unevenness.

  Further, in the present invention, the start and stop of the ejection of the inert gas can be performed at any timing as long as the inert gas is sprayed from the quenching chamber to the processed product moving in the extraction direction. As in the invention according to claim 3, the ejection of the inert gas from the ejection port of the gas spray nozzle is started at the start of movement of the treated product in the extraction direction after the oil cooling, and the treated product is ejected from the ejection port. If it is configured to have an ejection control device that stops before the movement is completed after passing through the opposite position, the inert gas ejection time other than the time that is actually sprayed to the treated product is shortened. And unnecessary waste of inert gas is prevented.

  In the present invention, an inert gas at normal temperature may be sprayed on the treated product. However, as in the invention described in claim 4, the inert gas supply device includes a heater for gas heating. If the heated inert gas is blown to the treated product from the jet outlet, the inert gas heated and heated by the gas heating device is sprayed, so Oil can be reliably and easily separated and removed in a low viscosity state.

  According to the present invention, it is possible to reduce the amount of quenching oil that adheres to a treated product after oil quenching and a basket or the like containing the treated product (hereinafter referred to as a treated product) and is extracted to the outside of the quenching chamber. The work of cleaning the hardened oil after extraction is reduced, and the amount of hardened oil in the oil tank is reduced.

  In addition to the above effects, according to the second aspect of the present invention, it is possible to separate and remove the quenching oil from each part of the treated product or the like without any unevenness.

  In addition to the above effect, according to the third aspect of the present invention, unnecessary waste of the inert gas is prevented.

  In addition to the above effect, according to the invention of claim 4, the hardened oil adhering to the treated product or the like can be reliably and easily removed in a low viscosity state.

  Hereinafter, an embodiment of the present invention will be described with reference to an example shown in FIGS. FIG. 1 shows the entire vacuum oil quenching apparatus 1, 2 is a heating chamber, 3 is a quenching chamber connected to the heating chamber 2 via a partition door 4, and 5 is an oil tank provided below the quenching chamber. Yes, quenching oil 6 is stored. Reference numeral 7 denotes an entrance door of the quenching chamber.

  The heating chamber 2 is formed by being surrounded by a heat insulating wall 12 in a furnace shell 11 which is a pressure vessel to which a vacuum pump (not shown) is connected, and has a heater 13 for heating. 14 is a guide rail made of channel steel fixed in the furnace shell 11 for guiding a hanger 20 (described later) for supporting the processed product W when the processed product W is received and sent into the heating chamber 2. belongs to. Reference numeral 15 denotes a lifting table that supports the processed product W, and is driven up and down by a cylinder 16. Reference numeral 17 denotes a cylinder for opening and closing the partition door 4.

  In FIGS. 1 and 2, reference numeral 20 denotes a hanger for supporting the processed product W, and a plurality of pairs of rollers 23 are provided on an upper frame 22 on which a fork portion 21 on which the processed product W is placed is fixed. Reference numeral 25 denotes a lifting / lowering drive device for the hanger 20, which is formed by connecting a lifting frame 27 having a pair of groove-shaped steel guide rails 26 for guiding and supporting the roller 23 of the hanger 20 to a piston rod of the lifting cylinder 28. .

  On the other hand, on the outside of the entrance door 7 of the quenching chamber 3, the elevating table 31 that supports the processed product W before and after the quenching process, and the hanger 20 is guided when the processed product W is loaded into and extracted from the quenching apparatus. An oscillating channel steel guide rail 32 is provided. In this example, the single door type doorway 7 is used for opening and closing the entrance and exit of the quenching chamber 3, so that the guide rail 32 is moved upward around the support shaft 34 by the cylinder 33 when the doorway 7 is opened and closed. It is made to rotate and to prevent interference with the doorway door 7.

  Reference numeral 40 denotes a front / rear drive device that drives the hanger 20 back and forth along the guide rails 32, 26, and 14 so as to engage with a chain 41 (see FIG. 2) extending in the front-rear direction fixed to the upper frame 22 of the hanger 20. In addition, four drive sprockets 42 (see FIG. 1) provided in each part are rotationally driven by a motor 43. That is, the two drive sprockets 42 at the top of the quenching chamber 3 are chain-driven by a motor 43, and the rotation of these drive sprockets 42 is connected to the top of the heating chamber 2 and the outside of the quenching chamber (guides) via interlocking chains 44 and 45. Each of the drive sprockets 42 is rotationally driven in the same direction at the same peripheral speed.

  Reference numeral 50 denotes a position detection device for the hanger 20. The hanger 20 detects the position of the dog 52 attached to the loop chain 51 that is chain driven by the motor 43, so that the hanger 20 is outside the quenching chamber 3, inside the quenching chamber 3, and the heating chamber 2. Sensors 53, 54, 55 for detecting that the respective stop positions have been reached, and a processing product W extracted from the quenching chamber 3 for passing through an after-mentioned gas blowing nozzle 60 for passage of inert gas blowing end control described later. It is sometimes equipped with a sensor 56 that is actuated by a dog 52 to generate a signal.

  The detection signals of these sensors 53 to 56 are input to the control device 57, and in response to this, the control device 57 performs the front / rear drive of the hanger 20 by the control of the motor 43 and the inert gas blowing control described later by the output signal S. . In addition to this, the control device 57 responds to the vacuum oil quenching process, such as driving of the lift cylinder 28 and cylinders 16, 17, 33, the temperature and degree of vacuum of the heating chamber 2, and the oil temperature of the quenching oil 6. It performs program control of each part.

  On the other hand, 60 is a gas spray nozzle provided at an inner position of the entrance door 7 of the quenching chamber 3 and is provided along a vertical surface 61 orthogonal to the moving direction X when the processed product W is extracted from the quenching chamber 3. A large number of nozzle pipes 62 that surround the bottom and both sides of the movement path of the processed product W and the hanger 20 are mounted on the vertical surface 61 inside the substantially U-shaped nozzle pipe 62 (the processed product W passage side). It has been. Reference numeral 63 denotes a bracket for fixing and holding the nozzle pipe 62 to the furnace wall of the quenching chamber 3. In this example, as shown in FIG. 3, each gas blowing nozzle 60 has a central axis 64 a of the jet port 64 on the side opposite to the extraction direction X of the processed product W with respect to the vertical surface 61, that is, in the quenching chamber 3. It is fixedly attached to the nozzle pipe 62 in a state where it is inclined inward by a predetermined angle θ.

The gas feed port 65 of the nozzle pipe 62 is connected to an inert gas supply device (in this example, an N ₂ gas tank) 67 via a pipe 66. 68 is an on-off valve provided in the middle of the pipe 66, and 69 is a gas heating heater.

  In order to quench the processed product W by vacuum oil by the apparatus having the above configuration, the unprocessed processed product W on the lifting platform 31 in the raised state is transferred to the hanger 20 supported by the guide rail 32 outside the quenching chamber, Next, the hanger 20 is driven forward by the front / rear drive device 40 and the processed product W conveyed into the heating chamber 2 through the quenching chamber 3 is transferred onto the lifting table 15, and the hanger 20 is moved back into the quenching chamber 3. After the partition door 4 is closed and the inside of the heating chamber 2 is depressurized to a predetermined degree of vacuum, the processed product W is vacuum-heated at a predetermined temperature.

  The processed product W after the vacuum heating is restored in the heating chamber 2, then the partition door 4 is opened and transferred from the lifting table 15 onto the fork portion 21 of the hanger 20, and as shown by a solid line in FIG. 1. After stopping in the entrance chamber 3, the hanger 20 is driven down by the elevating cylinder 28 together with the elevating frame 27 to immerse the processed product W in the quenching oil 6.

After dipping in the quenching oil 6 for a predetermined time, the hanger 20 is driven up to lift the processed product W into the quenching chamber 3, and then the hanger 20 is driven backward in the extraction direction indicated by the arrow X by the front-rear drive device 40. Then, the processed product W is extracted from the quenching chamber 3 to the outside. At this time, the opening / closing valve 68 is opened by the output signal S of the control device 57 at the start of movement of the hanger 20 in the extraction direction, and the N ₂ gas of the inert gas supply device 67 is heated by the gas heating heater 69 and then the nozzle pipe. 62 and is ejected from the ejection port 64 of each gas spray nozzle 60.

The ejected N ₂ gas is sprayed on the processed product W that moves in the extraction direction together with the hanger 20, whereby the processed product W and the basket (not shown) for storing the processed product W, the hanger 20, etc. Hereinafter, the quenching oil 6 adhering to the treated product or the like is separated and removed from the adhering portion and dropped downward, and the amount of the quenching oil 6 extracted to the outside of the quenching chamber 3 is Is reduced.

Since the gas spray nozzles 60 are arranged on the vertical surface 61 orthogonal to the extraction direction X, N ₂ gas is sprayed simultaneously on the upper and lower parts on the vertical surface of the processed product and the like passing through the array portion. The hardened oil separated and removed from the upper part of the treated product etc. is prevented from dripping and reattaching to the lower part of the treated product etc. from which the hardened oil 6 has been removed. The quenching oil 6 is separated and removed well. Furthermore, in this example, since the jet port 64 of the gas spray nozzle 60 is inclined to the side opposite to the extraction direction X as shown in FIG. 3, the quenching oil 6 separated from the treated product or the like is inside the quenching chamber 3. It is driven in the direction and can be reliably recovered in the oil tank 5.

Further, since the N ₂ gas is heated by the gas heating heater 69 and heated to the quenching oil adhering portion of the treated product or the like, the quenching oil 6 can be reliably and easily removed from the treated product or the like in a low viscosity state. Separated and removed.

When the processed product W passes through 60 parts of the gas spray nozzle (in this example, 61 parts of the vertical surface) by the backward driving of the hanger 20, the control device 57 detects the passage by the sensor 56, and the control device 57 immediately passes through After a predetermined short time from the time of passage, the valve closing signal of the opening / closing valve 68 is output as the output signal S, the opening / closing valve 68 is closed, the N ₂ gas blowing from the gas blowing nozzle 60 is finished, and the N ₂ gas is unnecessary. Unnecessary waste is prevented. Thereafter, the hanger 20 is stopped at a predetermined stop position outside the quenching chamber 3, and the processed product W is transferred onto the lifting platform 31 to complete one vacuum quenching. The above process may be repeated.

The treated product extracted from the quenching chamber 3 is separated and removed from the adhering portion of the quenching oil 6 by the N ₂ gas spraying as described above, so that only a small amount of the quenching oil 6 remains, and the lifting platform A small amount of the quenching oil 6 is dripped onto the floor surface 31 and its surroundings. Cleaning of the residual adhesion quenching oil such as the dripping quenching oil and the treated product can be easily performed by wiping with a cloth piece or the like. It can be done and is not time consuming.

  The present invention is not limited to the above example. For example, the specific configuration of the heating chamber 2 and the quenching chamber 3, the conveyance / support mechanism for the processed product W, and the like may be other than those described above. In addition, the arrangement of the gas spray nozzles, the direction of the nozzle outlet, the start and stop timing of the inert gas ejection, the type of the inert gas, etc. may be other than the above, and the properties of the quenching oil and after quenching Depending on the temperature of the processed product, the gas heater 69 may be omitted. In the above example, the case where the present invention is applied to a vacuum oil quenching apparatus has been described. However, the present invention can also be applied to an oil quenching apparatus that performs oil quenching at normal pressure.

It is a longitudinal cross-sectional view of the vacuum oil hardening apparatus which shows an example of embodiment of this invention. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vacuum oil hardening apparatus, 2 ... Heating chamber, 3 ... Quenching chamber, 5 ... Oil tank, 6 ... Quenching oil, 20 ... Hanger, 50 ... Position detection device, 57 ... Control device, 60 ... Gas spray nozzle, 61 DESCRIPTION OF SYMBOLS ... Vertical surface, 64 ... Outlet, 67 ... Inert gas supply apparatus, 68 ... On-off valve, 69 ... Heater for gas heating, W ... Processed article.

Claims (4)

  A quenching chamber having an oil tank for storing quenching oil at the bottom is connected to the heating chamber via a partition door, and the processed product heated in the heating chamber is immersed in the quenching oil in the oil tank. In an oil quenching apparatus for oil cooling, an inert gas supply apparatus and an inert gas supply apparatus connected to the inert gas supply apparatus are sprayed onto the processed product extracted from the quenching chamber after the oil cooling. An oil quenching apparatus comprising a plurality of gas spray nozzles arranged at positions inside an entrance door of the quenching chamber with a jet port facing.   The oil quenching apparatus according to claim 1, wherein the plurality of gas spray nozzles are arranged on a vertical plane orthogonal to a moving direction during extraction of the processed product.   The ejection of the inert gas from the ejection port of the gas spray nozzle is started at the start of movement in the extraction direction of the treated product after the oil cooling, and the movement is performed after the treated product has passed the position facing the ejection port. The oil quenching device according to claim 1, further comprising an ejection control device that stops the operation until the operation is finished.   4. The oil firing according to claim 1, 2 or 3, wherein the inert gas supply device includes a heater for gas heating, and the inert gas heated by the heater is sprayed from the ejection port onto the processed product. Input device.

Images