CN112313021A - Preheating device of casting machine die - Google Patents

Preheating device of casting machine die Download PDF

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Publication number
CN112313021A
CN112313021A CN201980002271.1A CN201980002271A CN112313021A CN 112313021 A CN112313021 A CN 112313021A CN 201980002271 A CN201980002271 A CN 201980002271A CN 112313021 A CN112313021 A CN 112313021A
Authority
CN
China
Prior art keywords
hot air
mold
heating box
casting machine
preheating device
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
CN201980002271.1A
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Chinese (zh)
Inventor
中村茂之
永田雄大
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokuden Co Ltd Kyoto
Original Assignee
Tokuden Co Ltd Kyoto
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 Tokuden Co Ltd Kyoto filed Critical Tokuden Co Ltd Kyoto
Priority to PCT/JP2019/021113 priority Critical patent/WO2020240701A1/en
Publication of CN112313021A publication Critical patent/CN112313021A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C9/00Moulds or cores; Moulding processes
    • B22C9/06Permanent moulds for shaped castings
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20Accessories: Details
    • B22D17/22Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00Pressure casting; Vacuum casting
    • B22D18/04Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould

Abstract

The preheating device for a casting machine mold according to the present invention heats a casting machine mold composed of an upper mold (1) and a lower mold (2), and is characterized by comprising a heating box (3) disposed between the upper mold (1) and the lower mold (2), a hot air generator (4) that generates hot air outside the heating box (3), and a hot air introduction pipe (5) that introduces the hot air from the hot air generator (4) into the mold inside the heating box (3).

Description

Preheating device of casting machine die
Technical Field
The present invention relates to a preheating device for preheating a mold of a low-pressure casting machine or the like.
Background
Automotive parts and the like are manufactured by pouring molten metal into a mold and casting, and for example, a low-pressure casting machine is used for manufacturing a cylinder head of an automotive engine. In the manufacture of automotive parts by a low-pressure casting machine, preheating of a mold is performed in order to improve the production efficiency of the product. That is, by heating the mold in advance before the molten metal is poured, casting can be started immediately, and the preparation time for manufacturing can be shortened.
Conventionally, the preheating of the mold is performed by heating the upper mold and the lower mold with a gas burner, and for example, patent document 1 discloses a preheating method of a casting mold in which the mold is preheated by hot air generated by the burner being fed from an opening portion of the mold in a state where the casting mold is closed.
However, heating by the gas burner has problems of large heat loss, poor heating efficiency, and large or large running cost. Further, there is a possibility that gas leakage or the like occurs in terms of safety, and a monitor is always required to prevent a fire, which requires a labor cost. Therefore, as shown in fig. 1 and 2, an electrothermal preheating method using a cartridge heater is proposed.
Fig. 1 is a schematic view showing a preheating device using a conventional cartridge heater, and fig. 2 is a partial plan view thereof. A conventional preheating device using a cartridge heater is configured such that a plurality of rod-like cartridge heaters 54, a heating box 53 with a cartridge heater built therein, and the like are disposed between an upper mold 51 and a lower mold 52 of a casting machine, and the inside of the mold is heated.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2000-334557
Disclosure of Invention
Technical problem to be solved by the invention
Since the preheating of the mold by the cartridge heater is of an electrothermal type, the above-mentioned disadvantage of the heating by the gas burner is eliminated, and it can be called an effective heating method. However, since the heat source is left in the central portion of the mold, there is a problem that heating of a portion of the ingate (weir) 55 located below the mold and a portion of the gate insert (inlet )56 located below the portion becomes insufficient.
In addition, the size of the heating box housing the preheating power supply is limited to an approximate value in terms of the preheating principle, which is necessary to the size of the mold to be preheated. It is difficult to increase the N number of the cartridge heater in order to improve the heating capacity under such a size constraint.
In order to solve such a problem, it is conceivable to use a preheating device using the above-described cartridge heater and a hot air introduction pipe for feeding hot air from the hot air generator to heat the sprue 55 and the gate insert 56.
However, when the heat generation temperature of the cartridge heater is increased, the sealing material in the hot air generator may overheat, and the hot air generator may break or malfunction. In addition, the cartridge heater itself is also thermally deformed at a high temperature, and a disconnection of the heater or a disconnection of the thermocouple is induced.
The present invention has been made in view of the above-described problems, and an object thereof is to provide a preheating device for a casting machine mold, which can secure a space in a heating box, provide an additional preheating source, and heat the inside of the mold in a full-scale and efficient manner.
Means for solving the problems
In order to solve the above problems, a preheating device for a casting machine mold according to the present invention heats a casting machine mold including an upper mold and a lower mold, the preheating device including: a heating box disposed between the upper die and the lower die; a hot air generator that generates hot air outside the heating box; and a hot air introduction pipe disposed in the heating box for introducing hot air from the hot air generator into the mold.
Accordingly, a preheating device for a casting machine mold is realized, which can ensure the space in the heating box, has a space margin for installing an additional preheating source, and can efficiently heat the entire interior of the mold.
Here, the heating box may be larger than the upper and lower molds.
Preferably, the hot air introduction pipe is a double-walled pipe including an inner pipe and an outer pipe, and a gap portion is formed between the inner pipe and the outer pipe. This can reduce heat loss.
Preferably, a distal end portion of the hot air introduction pipe is made of a material having a higher heat resistance than a main body portion of the hot air introduction pipe, and the distal end portion and the main body portion are welded to each other. This can extend the life of the pipe.
Effects of the invention
As described above, according to the preheating device for a casting machine mold according to the present invention, it is possible to secure a space in the heating box, and to provide an additional preheating source, and to efficiently heat the entire interior of the mold.
Drawings
Fig. 1 is a schematic view showing a conventional preheating apparatus.
Fig. 2 is a partial plan view of a conventional preheating device.
Fig. 3 is a schematic diagram showing the configuration of the preheating device for a casting machine mold according to the present embodiment.
Fig. 4 is a partial top view of fig. 3.
Fig. 5 is a schematic diagram showing another configuration of the preheating device for a casting machine mold according to the present embodiment.
Fig. 6 is a partial top view of fig. 5.
Fig. 7 is a schematic view showing the structure of the hot air introduction pipe.
Fig. 8 is a schematic view showing a configuration of a distal end of the hot air introduction pipe.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The preheating device for a casting machine mold according to the present embodiment is a device for preheating a mold of a casting machine for casting an automobile part or the like.
Fig. 3 is a schematic diagram showing the structure of a preheating device for a casting machine mold according to the present embodiment, and fig. 4 is a partial plan view thereof.
The casting machine includes an upper die 1 and a lower die 2 as dies for casting automobile parts and the like. A sprue 6 serving as a molten metal supply path for supplying molten metal is provided below the lower die 2, and a gate insert for ensuring accumulation of molten metal uniformly poured from the plurality of sprues 6 is provided below the sprue 6.
A heating box 3 having a heat source therein is disposed between the upper mold 1 and the lower mold 2. Since the heating box 3 is a member for preheating the mold of the casting machine, the outer box covering the heater needs to be made of a heat-resistant material, and is preferably made of stainless steel (SUS), for example.
A part of the duct-type hot air generator 4 is disposed inside the heating box 3, and the hot air generator 4 functions as a heat source. A hot air introducing pipe 5 is connected to a hot air generator 4 disposed in the heating box 3.
The hot air introduction pipe 5 is a pipe for feeding hot air from the hot air generator 4 to a portion to be preheated in the mold. A hot air generator 4 disposed in the heating box 3 and a hot air introduction pipe 5 connected thereto are used to heat the upper mold 1 and the lower mold 2, and an upward hot air nozzle for blowing hot air to the upper mold 1 and a downward hot air nozzle for blowing hot air to the lower mold 2 are installed at the tip of the hot air introduction pipe 5. In order to preheat the upper mold 1 and the lower mold 2 to a predetermined temperature, it is preferable to adjust the difference in the amount of hot air to be blown so as to increase the amount of hot air to be blown downward by making the diameter of the upward hot air nozzle smaller than that of the downward hot air nozzle.
Further, a plurality of hot air generators 4 are also disposed outside the heating box 3, and hot air introduction pipes 5 are disposed inside the heating box 3 so as to correspond to the hot air generators 4, respectively. The hot air introducing pipe 5 is inserted into the ingate 6 at its front end, and hot air is discharged from the front end, so that the ingate 6 and the gate insert are preheated by heat transfer heating, and temperature can be maintained.
Hot air from a hot air generator 4 disposed outside the heating box 3 is supplied to a hot air introduction pipe 5 inside the mold, which is formed in an L-shape when viewed from the front, and the hot air generated from the hot air generator 4 is supplied to portions to be heated, such as the upper mold 1, the lower mold 2, the ingate 6, and the gate insert, respectively. The hot air generator 4 and the hot air introduction pipe 5 may be provided at any appropriate positions depending on the position to be heated.
The diameter of the tip of the hot air introduction pipe 5 is preferably set according to the diameter of the ingate 6. When the diameter of the hot air introduction pipe 5 is relatively small with respect to the diameter of the ingate 6, the hot air does not contact the ingate 6, and the heating of the ingate 6 becomes insufficient, and when the diameter of the ingate 6 is relatively large, most of the hot air blown from the tip end contacts the ingate 6, and the heat supply to the gate insert becomes insufficient.
The example shown in FIG. 4 shows an example where the ingate 6 is at 4. As shown here, the preheating device for the casting machine mold configured as described above sufficiently ensures a space in the heating box 3 to the extent that an additional preheating source can be provided. In addition, since the hot air introduction pipe 5 can be appropriately provided at a portion to be heated, the inside of the mold can be heated in a complete and efficient manner.
Next, another structure of the preheating device for the casting machine mold will be described.
Fig. 5 is a schematic view showing another configuration of the preheating device for the casting machine mold, and fig. 6 is a partial plan view thereof.
The difference from the above-described preheating apparatus of fig. 3 and 4 is that the heating box 3a has a size larger than the upper die 1 and the lower die 2, and the hot air generator 4a, which is a part of the hot air generator disposed outside the heating box, is disposed inside the heating box 3 a. According to this another configuration, since the hot air introduction pipe 5 and the hot air introduction pipe 5a can be appropriately provided at the portion to be heated, the size of the heating box 3a housing the preheating power supply can be made larger than the upper die 1 and the lower die 2 without being restricted in size such as an approximate value of the size of the die to be preheated, and the space in the heating box 3a can be further secured, and an additional preheating source can be provided.
Fig. 7 is a schematic view showing the structure of the hot air introduction pipe.
The hot air introduction pipe 5(5a) is formed of a material such as SUS304, and the temperature (T1) of hot air on the upstream side of the pipe is reduced by more than 10% on the downstream side of the pipe (T0).
The hot air introduction pipe 5b has a double structure of an outer pipe and an inner pipe 7, and a space 8 is formed between the outer pipe and the inner pipe. In the hot air introduction pipe 5b having such a double-walled pipe structure, the temperature of the hot air on the upstream side of the pipe (T0) can be suppressed from decreasing by about 3% at the temperature on the downstream side of the pipe (T2), and the heat loss of the hot air from the hot air generator can be reduced.
Fig. 8 is a schematic view showing a configuration of a distal end of the hot air introduction pipe.
Further, the hot air inlet pipe tip portion 9, which is the outlet of the hot air in the hot air inlet pipe 5B, is a portion (B) that is likely to become high in temperature, and the main body portion made of SUS304 or the like is a portion (a) that is likely to become lower in temperature than B. Therefore, the hot air introduction pipe 5b is formed by forming the hot air introduction pipe tip 9 into SUS310S and joining the hot air introduction pipe tip to the main body of SUS304 by welding to form the welded portion 10. This can increase the life by about 2 times as compared with the case where the hot air introduction pipe is formed of SUS304 alone. In this way, the hot air introduction pipe 5b is made of heat-resistant steel or heat-resistant stainless steel at the hot air introduction pipe distal end portion 9, which is a hot air outlet port that is always at a high temperature and is likely to be deformed or worn, and is welded to the main body portion, thereby achieving a longer life of the hot air introduction pipe 5 b.
According to the preheating device for a casting machine mold configured as described above, since the hot air introduction pipe for introducing hot air from the hot air generator into the mold is disposed at a portion to be heated, and the upper mold and the lower mold of the mold, and the lower ingate, the gate insert, and the like are heated by heat transfer of the hot air, the entire interior of the mold can be heated comprehensively and efficiently. In addition, since all or a part of the hot air generator is disposed outside the heating box, a space in the heating box is secured, and there is a space margin for providing an additional preheating source.
The preheating device for a casting machine mold according to the present invention has been described above based on the embodiments, but the present invention is not limited thereto, and various design changes can be made within a range that can achieve the object of the present invention and does not depart from the gist of the present invention, and all of them are included in the scope of the present invention.
Industrial applicability
The preheating device for a casting machine mold according to the present invention is useful as a preheating device for a low-pressure casting machine or the like, and is particularly suitable as a preheating device for a casting machine for automobile parts.
Description of the symbols
1 Upper die
2 lower die
3. 3a heating box
4. 4a hot air generator
5. 5a, 5b hot air introducing pipe
6 ingate
7 inner side tube
8 void part
9 front end of hot air inlet pipe
10 welding part
51 Upper die
52 lower die
53 heating box
54 cylinder type heater
55 ingate
56 gate insert

Claims (4)

1. A preheating device for a casting machine mold, which heats a casting machine mold composed of an upper mold and a lower mold, is characterized by comprising:
a heating box disposed between the upper die and the lower die;
a hot air generator that generates hot air outside the heating box; and
and a hot air introduction pipe disposed in the heating box for introducing hot air from the hot air generator into the mold.
2. The preheating device for a caster die as defined in claim 1,
the heating box is larger than the upper die and the lower die.
3. The preheating device for a caster die as defined in claim 1,
the hot air leading-in pipe is composed of a double-layer pipe of an inner side pipe and an outer side pipe,
a gap is formed between the inner tube and the outer tube.
4. The preheating device for a caster die as defined in claim 1,
the front end of the hot air inlet pipe is made of a material with higher heat resistance than the main body of the hot air inlet pipe,
the front end portion and the main body portion are connected by welding.
CN201980002271.1A 2019-05-28 2019-05-28 Preheating device of casting machine die Pending CN112313021A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2019/021113 WO2020240701A1 (en) 2019-05-28 2019-05-28 Casting machine mold preheating device

Publications (1)

Publication Number Publication Date
CN112313021A true CN112313021A (en) 2021-02-02

Family

ID=73553118

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201980002271.1A Pending CN112313021A (en) 2019-05-28 2019-05-28 Preheating device of casting machine die

Country Status (2)

Country Link
CN (1) CN112313021A (en)
WO (1) WO2020240701A1 (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2483613Y (en) * 2001-06-01 2002-03-27 上海梅山(集团)有限公司 Composite coal power jetting tube device
CN201028238Y (en) * 2007-04-24 2008-02-27 刘治江 Helical wind pipe for boat
CN201723860U (en) * 2010-01-13 2011-01-26 中建五局工业设备安装有限公司 Double-layer spiral heat-insulating air pipe device
JP2011080719A (en) * 2009-10-09 2011-04-21 Mirapuro:Kk Heat insulation double pipe
CN102748933A (en) * 2012-06-26 2012-10-24 中国重型机械研究院有限公司 Hot air purging device
CN104550842A (en) * 2013-10-11 2015-04-29 特殊电极株式会社 Preheating device and preheating method of casting machine die
CN204828987U (en) * 2015-06-18 2015-12-02 河北天能新型建材股份有限公司 Air conditioner tuber pipe
CN105436463A (en) * 2015-12-04 2016-03-30 重庆市永川区邦威机械制造有限公司 Die-casting mould for tubular automobile part
CN206326116U (en) * 2016-12-17 2017-07-14 苏州安路特汽车部件有限公司 A kind of online preheating device of casting mould
JP2018030161A (en) * 2016-08-26 2018-03-01 特殊電極株式会社 Preheating apparatus and preheating method for casting machine metallic mold

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5677058A (en) * 1979-11-27 1981-06-25 Toyota Motor Corp Preheating method of die-casting die
JP5359718B2 (en) * 2009-09-14 2013-12-04 トヨタ自動車株式会社 Preheating device
JP2012170976A (en) * 2011-02-21 2012-09-10 Toyota Motor Corp Die preheating device
JP6836035B2 (en) * 2017-12-15 2021-02-24 特殊電極株式会社 Casting machine mold preheating device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2483613Y (en) * 2001-06-01 2002-03-27 上海梅山(集团)有限公司 Composite coal power jetting tube device
CN201028238Y (en) * 2007-04-24 2008-02-27 刘治江 Helical wind pipe for boat
JP2011080719A (en) * 2009-10-09 2011-04-21 Mirapuro:Kk Heat insulation double pipe
CN201723860U (en) * 2010-01-13 2011-01-26 中建五局工业设备安装有限公司 Double-layer spiral heat-insulating air pipe device
CN102748933A (en) * 2012-06-26 2012-10-24 中国重型机械研究院有限公司 Hot air purging device
CN104550842A (en) * 2013-10-11 2015-04-29 特殊电极株式会社 Preheating device and preheating method of casting machine die
CN204828987U (en) * 2015-06-18 2015-12-02 河北天能新型建材股份有限公司 Air conditioner tuber pipe
CN105436463A (en) * 2015-12-04 2016-03-30 重庆市永川区邦威机械制造有限公司 Die-casting mould for tubular automobile part
JP2018030161A (en) * 2016-08-26 2018-03-01 特殊電極株式会社 Preheating apparatus and preheating method for casting machine metallic mold
CN206326116U (en) * 2016-12-17 2017-07-14 苏州安路特汽车部件有限公司 A kind of online preheating device of casting mould

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