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WO2002020195A1 - Dispositif et procede de traitement thermique pour coulee - Google Patents

Dispositif et procede de traitement thermique pour coulee Download PDF

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Publication number
WO2002020195A1
WO2002020195A1 PCT/JP2000/006096 JP0006096W WO0220195A1 WO 2002020195 A1 WO2002020195 A1 WO 2002020195A1 JP 0006096 W JP0006096 W JP 0006096W WO 0220195 A1 WO0220195 A1 WO 0220195A1
Authority
WO
WIPO (PCT)
Prior art keywords
sand
product
vibration
heat treatment
impact
Prior art date
Application number
PCT/JP2000/006096
Other languages
English (en)
Japanese (ja)
Inventor
Hiroshi Usui
Original Assignee
Taiho Industries Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Taiho Industries Co., Ltd. filed Critical Taiho Industries Co., Ltd.
Priority to AU2000268739A priority Critical patent/AU2000268739A1/en
Priority to PCT/JP2000/006096 priority patent/WO2002020195A1/fr
Publication of WO2002020195A1 publication Critical patent/WO2002020195A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/005—Removing cores by vibrating or hammering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/003—Removing cores using heat

Definitions

  • the present invention relates to a heat treatment apparatus and a heat treatment method for a prefabricated product, which can remove ⁇ -type sand and core sand during heat treatment of the prefabricated product.
  • Automobile parts such as engine blocks and cylinder heads, tend to shift from iron to aluminum for the purpose of weight reduction, and their shapes and thickness are becoming more complicated.
  • a product is manufactured using a core, cooled to room temperature, cut, glued, and knocked out, and then the binder in the core is baked in a sand sintering furnace to remove the core sand.
  • the method of recovering and then performing heat treatment such as quenching, tempering, and solution treatment was adopted.
  • cooling is performed once after fabrication, so that not only the heat possessed by the fabricated product is wasted, but also processing equipment for cooling and time for cooling are required.
  • the heat treatment apparatus (method) proposed in the above-mentioned Japanese Patent Publication No. Sho 61-501123 has a configuration in which the binder is oxidatively decomposed while maintaining a high oxygen concentration in the furnace.
  • the slide pill located inside the product is not peeled off from the main body and the core is not supplied with sufficient oxygen and heat. Sand could not be completely removed and recovered.
  • the present inventors apply vibrations to a rack accommodating the product in the heating chamber, so that the mold adheres to the product while performing the heat treatment.
  • a heat treatment apparatus for peeling off sand and core sand has been proposed in Japanese Patent Application Laid-Open No. Hei 8-7-1735.
  • the present inventors diligently studied the problems of the above-described device, and found that the indirect vibration application of transmitting vibrations to the product via the rack is the cause of the problem described above. I found it.
  • due to indirect vibration ⁇ if the action given to the product is not sufficient, core sand is likely to remain, and if it is too strong, ⁇ the product will slip or move in the rack And was easily damaged by contact with the edge of the.
  • the heat treatment apparatus of the present invention has, in a heating chamber of the heat treatment apparatus, both an impact mechanism that directly impacts on the type III sand or the product and a vibration mechanism that directly vibrates.
  • the devices were provided in multiple stages. Then, while performing heat treatment on the product in the heating chamber, it was possible to peel off the mold sand and core sand adhering to the surface and inside of the product.
  • the heat treatment method of the present invention may be such that, depending on the shape and the like of the product, a direct impact, a direct vibration, or a direct vibration is applied to the type sand or the product after the direct impact.
  • a direct impact a direct vibration
  • a direct vibration a direct vibration
  • Heat treatment is performed in the heating chamber of the heat treatment apparatus of the present invention.
  • the binder in the core near the product is oxidized and decomposed.
  • a multi-stage device (hereinafter referred to as a direct stress acting device) that combines an impact mechanism that applies a direct impact and a vibration mechanism that applies a direct vibration makes it easy and reliable to apply impact and vibration directly to the product.
  • Ni-type sand and core sand can be peeled off.
  • the direct stress acting devices provided in multiple stages may operate only the impact mechanism that directly applies an impact according to the shape of the product, or may operate only the vibration mechanism that directly applies the vibration, or
  • the impact mechanism may be operated in the first stage direct stress device, and the vibration mechanism may be operated in the second stage direct stress device.
  • the heat treatment apparatus of the present invention can peel off the mold sand and core sand during the heat treatment, and more specifically, the slide chill located inside the product is peeled off from the main body even in the case of a complicated shaped product. Since the core and oxygen are sufficiently supplied, the binder in the core is completely oxidized and decomposed, and the core sand can be completely removed and recovered.
  • the product introduced into the heating chamber in the heat treatment apparatus of the present invention does not need to be cooled once after the production, it is necessary to cut the gate or continuously connect it. It may be introduced into the heating chamber continuously, and may have a predetermined temperature in the heating chamber within a short time with the retained heat given by the structure, thereby shortening the time of the heat treatment. Alternatively, it may be cooled and then introduced into a heating chamber for heat treatment. Therefore, the heat treatment apparatus of the present invention can heat-treat a large number of products in a short time when a plurality of products are continuously subjected to the heat treatment. Due to these effects, a product can be manufactured in an extremely short time. BRIEF DESCRIPTION OF THE FIGURES
  • FIG. 1 is a side sectional view showing one embodiment of a heat treatment apparatus according to the present invention
  • FIG. 2 is a plan view thereof
  • FIG. 3 is a front view showing an impact mechanism of a direct stress acting device.
  • FIG. 4 is a side sectional view thereof
  • FIG. 5 is a front view showing a vibration mechanism of the direct stress application device
  • FIG. 6 is a side sectional view thereof
  • FIG. (A) is a plan view of a transfer basket in a heating chamber
  • FIG. 7 (b) is a front view thereof
  • FIG. 7 (c) is a side view thereof.
  • the continuous heat treatment apparatus shown in Figs. 1 and 2 has a heating chamber (solution furnace) 1 consisting of a heating zone 2 in the first half and a soaking zone 3 in the latter half, and directly above the heating zone 2.
  • a direct stress application device 6 ′ having both an impact mechanism for applying an impact and a vibration mechanism for applying a direct vibration is provided in multiple stages, and the lower end of a shaft 7 extending from each direct stress application device 6 ′ is located inside the heating zone 2. Is facing.
  • the direct stress application device 6 ′ has a total of eight vertically extending shafts 7 in four rows in the lateral direction and two rows in the front-rear direction, except that the number of shafts 7 is changed.
  • the direct stress acting device 6 having substantially the same configuration is shown in FIGS.
  • the reference numerals in the drawings in the following description are also used in FIGS. 1 and 2.
  • the embodiment of the impact mechanism 4 shown in FIGS. 3 and 4 has three rows in the lateral direction, There are a total of six vertically extending shafts 7 in two rows, with the lower end 8 of each shaft 7 located inside the heating chamber 1 and the upper end of each shaft 7 located outside the heating chamber 1 It is arranged to be.
  • Each shaft 7 is supported in series by a frame 10 via an air cylinder 19, and the frame 10 can be moved up and down by another air cylinder 11 arranged at the center thereof. It is located in FIG. 3, reference numeral 12 denotes a frame, and reference numeral 13 denotes a partition, which assists a stable vertical movement of the shaft 7 without hindering the vertical movement of the shaft 7.
  • Reference numeral 14 denotes a basket for holding a total of six pieces of type I sand or artificial product a, the details of which are shown in FIG.
  • the mechanism (part) related to the vibration mechanism 5 described later is intentionally omitted.
  • the frame 10 is lowered to an appropriate position by the operation of the air cylinder 11, and is stopped at a position where the lower end 8 of the shaft 7 does not come into contact with the type sand or the product a.
  • each shaft 7 is repeatedly moved up and down continuously, and the lower end 8 of each shaft 7 is caused to collide with the top of the type sand or the product a. Can act.
  • the strength of the impact on the ⁇ -type sand or the ⁇ a ’and the pitch (action interval) thereof can be easily adjusted by controlling the operation of the air cylinder 9.
  • air shockers 15 are respectively arranged at the upper ends of the six shafts 7 extending in the vertical direction.
  • the other configuration is the same as that of the impact mechanism 4 described above.
  • the mechanism (part) related to the above-mentioned impact mechanism 4 is intentionally omitted.
  • the frame 10 is first lowered to an appropriate position by the operation of the air cylinder 11, and the lower end 8 of the shaft 7 is brought into contact (pressure contact) with the top of the type sand or the product a. To stop. Subsequently, by operating the air shock forces 115, vibration can be applied from the lower end 8 of each shaft 7 to the top of the ⁇ -shaped sand or the structure a, and the vibration can be directly applied. At that time, the vibration intensity and pitch of type ⁇ sand or ⁇ product a The adjustment of the distance can be easily performed by controlling the operation of the air shocker 15. Note that an electric vibrator may be used instead of the air shocker.
  • crankshaft eccentric shaft
  • the vibration mechanism is not limited to the one that acts on the top of the ⁇ -type sand or the ⁇ a ’, and may be configured to support in the left-right direction and apply vibration in the lateral direction.
  • the direct stress application device 6 of the illustrated embodiment can drive the shaft 7 in two kinds of modes, and can directly apply stress (shock, vibration) to the ⁇ type sand or the ⁇ product a. it can. Therefore, it is possible to completely remove sand in a short time by appropriately adjusting the strength of impact and vibration and the pitch (action interval) according to the shape of the product. Therefore, the product a and the basket 14 do not come into contact with each other and are not damaged. Also, for example, it is possible to very easily cope with a case where vibration of eight pitches having a small amplitude is required.
  • hoppers 16 for receiving peeled-off ⁇ -shaped sand and core sand are provided side by side over the entire heating chamber 1, and a screw conveyor 1 is provided at the bottom of each hopper 16. 7 is installed, and the sand and core sand that have been peeled off by impact or vibration are discharged to the outside by this screw conveyor 17. It should be noted that sand may be discharged by a double damper instead of the screw conveyor.
  • thermoelectric heating zone 2 in the heating chamber 1 hot air heated by radiant tube burners 18 provided at appropriate intervals is blown by a circulation fan 19 to perform a high-temperature heat treatment.
  • a heat-resistant screen is installed at the top of the hopper 16 to control the size of the sand falling into the hopper 16 so that the resin can be easily burned by the radiant tube burner 18 installed in the hopper 16. It is devised.
  • the discharged sand Since the discharged sand has substantially disappeared due to the oxidative decomposition of the binder, it can be mixed with a new binder and reused as a ⁇ -type core.
  • the roller 22 supporting the lower surface of the basket 14 in the heating zone 2 does not have a drive source itself, the baskets 14 are extruded one after another at appropriate intervals by an extrusion type conveying device 20.
  • the baskets 14 on the heating zone 2 are sequentially intermittently pushed and transported accordingly. That is, in the heating zone 2, since the impact mechanism 4 and the vibration mechanism 5 apply a shock or vibration directly to the top of the ⁇ type sand or ⁇ product a as described above, the ⁇ type sand or ⁇ It is preferable to move the product a intermittently.
  • the movement and stop are repeated intermittently, so that impact or vibration is applied from the lower end 8 of the shaft 7 during stop, and the lower end of the shaft 7 is separated from the ⁇ -type sand or the product a during movement.
  • the roller 14 or the skid rail is laid on the lower surface of the basket 14, it is possible to easily plan a strength enough to withstand a hot shock even from the upper side.
  • the leveling zone 3 has a configuration in which the rollers 23 that support the lower surface of the basket 14 themselves have a drive source (not shown) and are continuously conveyed at a constant speed.
  • an air-cooled cooling chamber 25 and a water-cooled cooling chamber 30 are provided.
  • An air duct 26 is provided in the air-cooled cooling chamber 25, and the product a is quenched (cooled) by injecting air at an appropriate temperature. Since only a small amount of sand adheres (remains) on the surface of the product a, there is no need to provide a sand discharging device, but this is not particularly limited. Air injection nozzle By considering the shape, the quenching effect and the sand removal effect can be improved.
  • the water-cooled cooling chamber 30 is provided with an elevating device 31 and a water tank 32, and the product a is quenched (cooled) by being immersed in the water tank. Since only a small amount of sand adheres (remains) on the surface of the product a, it is not necessary to provide a sand discharging device, but this is not particularly limited.
  • the product a together with the basket 14 was immersed in the water tank 32, in order to wash away the sand remaining inside due to the evaporating steam and the vertical movement.
  • a relatively small engine block such as an in-line four-cylinder sand type, can discharge sand only by direct vibration. Sand may remain inside the cylinder during indirect vibration.
  • a large engine cylinder head with sand type cannot remove sand by direct impact only or direct vibration alone, leaving a considerable amount of sand inside the cylinder. To sand.
  • the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and can be implemented in any way unless the configuration described in the claims is changed. .
  • Industrial applicability As described above, the heat treatment apparatus of the present invention can directly apply impact and vibration while performing heat treatment on a product in a heating chamber, so that the type sand and core sand adhering to the product can be removed. It can be peeled off more reliably and in a shorter time.
  • the heat treatment apparatus and the heat treatment method of the present invention can be used to adjust the strength and strength of shock and vibration and the pitch (action interval) appropriately according to the shape of the manufactured product, etc. It can be applied to heat treatment of products and has extremely high practical value.
  • the heat treatment apparatus of the present invention has almost no relation to the weight of the target product, etc., because the impact mechanism that applies a direct impact and the vibration mechanism that applies a direct vibration are compared with the conventional mechanism that applies an indirect vibration. It can be designed to be extremely compact.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

L'invention concerne un dispositif et procédé de traitement thermique permettant de racler le sable de moulage et le sable à noyaux pendant le traitement thermique d'une pièce à mouler. Des appareils, présentant chacun un mécanisme d'impact (4) pour appliquer un impact direct au sable de moulage ou à la pièce à mouler (a) ainsi qu'un mécanisme vibrant (5) pour appliquer une vibration directe, sont utilisés à différents stades. Un impact direct et/ou une vibration directe sont appliqués au sable de moulage ou à la pièce à mouler dans une chambre de chauffage pour permettre ainsi le raclage du sable de moulage et du sable à noyaux déposé sur la surface ou à l'intérieur de la pièce à mouler lorsque cette dernière subit une traitement thermique dans la chambre de chauffage.
PCT/JP2000/006096 2000-09-07 2000-09-07 Dispositif et procede de traitement thermique pour coulee WO2002020195A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2000268739A AU2000268739A1 (en) 2000-09-07 2000-09-07 Heat treating device and heat treating method for casting
PCT/JP2000/006096 WO2002020195A1 (fr) 2000-09-07 2000-09-07 Dispositif et procede de traitement thermique pour coulee

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2000/006096 WO2002020195A1 (fr) 2000-09-07 2000-09-07 Dispositif et procede de traitement thermique pour coulee

Publications (1)

Publication Number Publication Date
WO2002020195A1 true WO2002020195A1 (fr) 2002-03-14

Family

ID=11736434

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2000/006096 WO2002020195A1 (fr) 2000-09-07 2000-09-07 Dispositif et procede de traitement thermique pour coulee

Country Status (2)

Country Link
AU (1) AU2000268739A1 (fr)
WO (1) WO2002020195A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013146741A (ja) * 2012-01-17 2013-08-01 Honda Motor Co Ltd 溶体化炉
JP2016112604A (ja) * 2014-12-17 2016-06-23 リョービ株式会社 砂中子の除去方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0336357U (fr) * 1989-08-11 1991-04-09
JPH0439556U (fr) * 1990-07-31 1992-04-03
US5732762A (en) * 1994-09-09 1998-03-31 Honda Giken Kogyo Kabushiki Kaisha Apparatus for heat treating castings containing cores
WO2000036354A1 (fr) * 1998-12-15 2000-06-22 Consolidated Engineering Company, Inc. Four mixte a conduction/convection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0336357U (fr) * 1989-08-11 1991-04-09
JPH0439556U (fr) * 1990-07-31 1992-04-03
US5732762A (en) * 1994-09-09 1998-03-31 Honda Giken Kogyo Kabushiki Kaisha Apparatus for heat treating castings containing cores
WO2000036354A1 (fr) * 1998-12-15 2000-06-22 Consolidated Engineering Company, Inc. Four mixte a conduction/convection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013146741A (ja) * 2012-01-17 2013-08-01 Honda Motor Co Ltd 溶体化炉
JP2016112604A (ja) * 2014-12-17 2016-06-23 リョービ株式会社 砂中子の除去方法

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