JPH0399767A - Method for manufacturing internal chilling piping in casting metallic mold - Google Patents
Method for manufacturing internal chilling piping in casting metallic moldInfo
- Publication number
- JPH0399767A JPH0399767A JP23657989A JP23657989A JPH0399767A JP H0399767 A JPH0399767 A JP H0399767A JP 23657989 A JP23657989 A JP 23657989A JP 23657989 A JP23657989 A JP 23657989A JP H0399767 A JPH0399767 A JP H0399767A
- Authority
- JP
- Japan
- Prior art keywords
- piping
- casting
- casting mold
- metallic mold
- cast
- 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
Links
- 238000005266 casting Methods 0.000 title claims abstract description 78
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 238000000034 method Methods 0.000 title description 16
- 239000000498 cooling water Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000005242 forging Methods 0.000 claims abstract description 10
- 238000003754 machining Methods 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- 229910001018 Cast iron Inorganic materials 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 11
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 7
- 239000004576 sand Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 101150000971 SUS3 gene Proteins 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は例えばアルミニウム合金等の鋳造製品を金型鋳
造により製造するための鋳造金型の製造方法に関し、特
に、鋳造金型内に冷却水通路用の配管を鋳包む際の鋳造
金型内鋳包み配管製作方法に係わる。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing a casting mold for manufacturing a cast product such as an aluminum alloy by die casting, and in particular, the present invention relates to a method for manufacturing a casting mold for manufacturing a cast product such as an aluminum alloy by die casting. This relates to a method for producing cast-in piping inside a casting mold when casting piping for passages.
自動車用アルミニウム合金部品を鋳造するための鋳造金
型には、キャビティ内に充填された溶湯の冷却固化を速
めて生産性を向上させるために、一般には冷却水通路が
設けられている。Casting molds for casting aluminum alloy parts for automobiles are generally provided with cooling water passages in order to speed up the cooling and solidification of the molten metal filled in the cavity and improve productivity.
従来より、鋳造金型に冷却水通路を設ける方法として、
−船釣には、第５ａ図および第５ｂ図に示すように、鋳
造金型５１の外部よりドリル等でもって直線的に冷却穴
５２ａ、５２ｂ、・・・を設け、配管とのジヨイント部
５３ａ、５３ｂを除き埋栓５４，５４．・・、を詰める
方法が取られている。Traditionally, as a method of providing cooling water passages in casting molds,
- For boat fishing, cooling holes 52a, 52b, . , 53b except for the plugs 54, 54. A method is being used to pack...
この他には、機械加工によらない方法として、鋳物川砂
（中子砂）を充填した調合金製のパイプを鋳包ませた後
に、鋳造金型に鋳包まれたパイプ内の鋳物川砂を除去し
て鋳造金型内に冷却水通路を形成する方法が、例えば特
開昭６３−３９６０号公報等により提案されている。In addition, as a method that does not involve machining, a prepared alloy pipe filled with foundry river sand (core sand) is cast into a mold, and then the foundry river sand inside the pipe is removed. A method of forming a cooling water passage in a casting mold has been proposed, for example, in Japanese Unexamined Patent Publication No. 63-3960.
しかしながら、上記従来の鋳造金型に冷却水通路を設け
る方法はいずれも問題があった。However, all of the above conventional methods of providing cooling water passages in casting molds have problems.
まず、前者の第５ａ図および第５ｂ図に示されるような
機械加工により直線的に冷却穴をあける方法では、製品
部（キャビティ）からの穴加工ができず、製品外部から
製品部に近いところを狙って穴加工をしようとしても所
望形状に加工できないため、冷却能力が不足したり不均
一となる。しかも、機械加工による切削スジで鋳造金型
に割れや錆が発生する。First, with the former method of drilling cooling holes linearly by machining as shown in Figures 5a and 5b, it is not possible to drill holes from the product part (cavity), and the hole cannot be drilled from the outside of the product close to the product part. Even if an attempt is made to drill a hole with the aim of achieving the desired shape, the hole cannot be machined into the desired shape, resulting in insufficient or uneven cooling capacity. Moreover, cutting lines caused by machining cause cracks and rust in the casting mold.
一方、後者の特開昭６３−３９６０号公報等に開示され
たようにパイプを鋳包む方法では、砂の除去の必要性か
ら冷却通路用のパイプを極力屈曲部をつくらないように
する必要があり、その形状に制約を受けるという問題が
あるのみならず、パイプ材料の銅合金が溶融し易いため
冷却水通路が鋳物のみとなり、亀裂が発生したり錆びや
すい等の問題があった。On the other hand, in the latter method of encasing pipes as disclosed in JP-A No. 63-3960, etc., it is necessary to avoid creating bends in the pipes for cooling passages as much as possible due to the necessity of removing sand. Not only does this have the problem of being restricted in its shape, but because the copper alloy of the pipe material is easily melted, the cooling water passages are made only of cast metal, which poses problems such as cracking and rusting.
上記の鋳造金型に冷却水通路を設ける方法の欠点を解消
する目的で、本出願人は、第６ａ図および第６ｂ図に示
すように、冷却水通路６１用のパイプとして耐熱・耐蝕
性のステンレスバイブロ２を用い、内部に加圧した冷却
ガスを流しながら、このステンレスバイブロ２を、鋳造
金型６３内に鋳包む方法を提案した（実願平 ］−４４
５１６号。In order to eliminate the drawbacks of the above-mentioned method of providing a cooling water passage in a casting mold, the applicant has developed a heat-resistant and corrosion-resistant pipe for the cooling water passage 61, as shown in FIGS. 6a and 6b. We proposed a method of casting the stainless steel vibro 2 into a casting mold 63 while flowing pressurized cooling gas inside the stainless steel vibro 2.
No. 516.
このステンレスパイプを鋳包む方法においても、１４０
０℃〜１６００°Ｃの溶湯に対してステンレスパイプの
溶損をさけるため、ステンレスパイプの肉厚を薄くはで
きず、そのためステンレスパイプの成形が困難となり、
その形状にやはり制約があるため、複雑な形状の鋳造金
型の場合には、必要部位を効果的に冷却できるようにす
ることは困難であった。In this method of casting stainless steel pipes, 140
In order to avoid corrosion of stainless steel pipes against molten metal at temperatures between 0°C and 1600°C, the wall thickness of stainless steel pipes cannot be made thinner, which makes it difficult to form stainless steel pipes.
Since there are restrictions on the shape of the mold, it has been difficult to effectively cool the necessary parts in the case of a casting mold with a complicated shape.
したがって、本発明は、鋳造金型に鋳包まれる冷却水通
路用のパイプの成形性を向上させることにより、複雑な
形状のキャビティを有する鋳造金型であっても鋳造中の
冷却性能を確保できるようにすることを目的とする。Therefore, the present invention improves the formability of the cooling water passage pipe that is cast into the casting mold, thereby ensuring cooling performance during casting even in a casting mold that has a cavity with a complex shape. The purpose is to do so.
この目的を達成するため、本発明の鋳造金型内鋳包み配
管製作方法は、鋳造金型内に冷却水通路用の配管を鋳包
む鋳造金型内鋳包み配管製作方法において、鋳鉄材をも
ちいて鋳造によりまたは鍛造材を用いて鍛造により鋳造
金型の本体を成形した後に機械加工により、あるいは鋳
造時または鍛造時において、鋳造金型の本体にキャビテ
ィの形状に倣った形状をなし冷却水通路用の配管を収容
するための溝を形成し、この溝に前記冷却水通路用の配
管を配設した後、この溝内に前記鋳造金型の本体および
前記配管に比べ低融点かつ高熱伝導率の材料の溶湯を流
し込んで前記配管を鋳包むことを特徴としている。In order to achieve this object, the method for producing cast-in piping in a casting mold of the present invention uses cast iron material in the method for producing cast-in piping in a casting mold, in which piping for a cooling water passage is cast in a casting mold. A cooling water passage is formed in the body of the casting die by molding the body of the casting die by casting or by forging using forged material, and then by machining, or at the time of casting or forging. After forming a groove for accommodating the piping for the cooling water passage and arranging the piping for the cooling water passage in this groove, a mold with a lower melting point and higher thermal conductivity than the main body of the casting mold and the piping is placed in the groove. The method is characterized in that the piping is encased by pouring a molten metal of the material.
上記本発明の方法によれば、鋳造または鍛造により成形
された鋳造金型の本体に溝を形成し、この溝に冷却水通
路用の配管を配設した状態で、前記鋳造金型の本体の材
料に比べ低融点かつ高熱伝導率の材料の溶湯を流し込ん
で、前記配管を鋳包むので、配管が溶融することがなく
なり、したがって、従来に比べ肉厚を薄くでき成形性が
よくなるので成形形状の制約が無くなる。そのため、任
意の形状に加工でき、この配管を鋳包んだ材料の熱伝導
率が高いこととあいまって、鋳造金型の冷却性能が大幅
に向上する。According to the method of the present invention, a groove is formed in the main body of the casting mold formed by casting or forging, and a pipe for a cooling water passage is provided in the groove. Since the piping is cast by pouring a molten metal of a material with a lower melting point and higher thermal conductivity than the original material, the piping will not melt. Therefore, the wall thickness can be made thinner than before, and moldability is improved, making it possible to change the molded shape. No more restrictions. Therefore, it can be processed into any shape, and combined with the high thermal conductivity of the material in which the pipe is cast, the cooling performance of the casting mold is greatly improved.
以下、本発明の一実施例に係わる鋳造金型内鋳包み配管
製作方法を図面によって説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing cast-in piping in a casting mold according to an embodiment of the present invention will be described below with reference to the drawings.
第１ａ図および第１ｂ図は本発明の一実施例に係わる鋳
造金型内鋳包み配管製作方法により製作した鋳造金型の
一部分を示す正面断面図および側面断面図、第２ａ図〜
第４ａ図および第２ｂ図〜第４ｂ図は本発明の一実施例
に係わる鋳造金型内鋳包み配管製作方法の製造工程を説
明するための鋳造金型の一部分の正面断面図および側面
断面図である。1a and 1b are a front sectional view and a side sectional view showing a part of a casting mold manufactured by a method for producing cast-in piping in a casting mold according to an embodiment of the present invention, and FIGS.
Figures 4a and 2b to 4b are a front sectional view and a side sectional view of a portion of a casting mold for explaining the manufacturing process of a method for producing cast-in piping in a casting mold according to an embodiment of the present invention. It is.
第１ａ図および第１ｂ図において、符号１は本実施例の
鋳造金型内鋳包み配管製作方法により製作された鋳造金
型、符号２はこの鋳造金型１の鋳鉄製の本体部、符号３
は鋳造金型１の高熱伝導部であり鋳鉄より融点が低くか
つ熱伝導率の高いアルミニウムで形成されている。符号
４は鋳造金型１の冷却水通路用のステンレス（ＳＵＳ３
０４．）製の配管、符号５はこの冷却水通路用の配管４
により形成された鋳造金型１の冷却水通路、符号６は鋳
造金型１の内側に形成されたキャビティである。In FIGS. 1a and 1b, reference numeral 1 denotes a casting mold manufactured by the method for producing cast-in piping in a casting mold according to this embodiment, numeral 2 denotes a cast iron main body of this casting mold 1, and numeral 3
is a high heat conductive part of the casting mold 1, and is made of aluminum, which has a lower melting point and higher heat conductivity than cast iron. The code 4 is stainless steel (SUS3) for the cooling water passage of the casting mold 1.
04. ) pipe, code 5 is pipe 4 for this cooling water passage
A cooling water passage 6 of the casting mold 1 is a cavity formed inside the casting mold 1.
この鋳造金型１は次のようにして製造される。This casting mold 1 is manufactured as follows.
まず、第２ａ図および第２ｂ図に示す所定の製品形状に
対応するキャビティ６を有する鋳鉄製の鋳造金型１の本
体２を、金型素材として５ＫＤ６１を用い、１５５０°
Ｃの５ＫＤ６１の溶湯を注湯して鋳造する。First, a body 2 of a casting mold 1 made of cast iron having a cavity 6 corresponding to a predetermined product shape shown in FIGS. 2a and 2b is heated at 155°
Pour C 5KD61 molten metal and cast.
次に、このようにして鋳造された鋳鉄製の鋳造金型１の
本体２に、機械加工により、第３ａ図および第３ｂ図に
示すような冷却水通路５用の配管４を収容するとともに
キャビティ６の形状に倣った形状の溝７を形成する。こ
の溝７は、鋳造金型１の本体２がキャビティ６へ向かっ
て突出している部分がそれに倣って深く削り込まれてい
る。Next, the main body 2 of the cast iron casting mold 1 cast in this manner is machined to accommodate the piping 4 for the cooling water passage 5 as shown in FIGS. 3a and 3b, and to form a cavity. A groove 7 having a shape similar to that of 6 is formed. This groove 7 is deeply cut into a portion of the casting mold 1 where the main body 2 protrudes toward the cavity 6 .
次に、第４ａ図および第４ｂ図に示すように、鋳造金型
１の本体２に形成された前記溝７に所定の形状に加工さ
れた冷却水通路用の配管４を配設する。そして、この溝
７に、アルミニウムの溶湯を流し込んで、前記冷却水通
路用の配管４を鋳造金型１の本体２に鋳包む。Next, as shown in FIGS. 4a and 4b, a cooling water passage piping 4 machined into a predetermined shape is disposed in the groove 7 formed in the main body 2 of the casting mold 1. Then, molten aluminum is poured into this groove 7, and the piping 4 for the cooling water passage is cast into the main body 2 of the casting mold 1.
以上により、第１ａ図および第１ｂ図に示すような鋳造
金型１が製造される。Through the above steps, a casting mold 1 as shown in FIGS. 1a and 1b is manufactured.
以上、本発明の鋳造金型内鋳包み配管製作方法を特定の
一実施例について説明したが、本発明はこれに限定され
るものではない。例えば、本実施例においては、鋳造金
型１の高熱伝導部３を構成する溝７を、鋳造金型１の本
体２を鋳造した後機械加工により形成したが、鋳造金型
１の本体２に前記′ａ７の部分を織り込んだ形状で鋳造
しても良い。このようにすると機械加工による溝の形成
工程が省かれるので製造コストを抑制することが可能と
なる。Although the method for producing cast-in piping in a casting mold according to the present invention has been described above with reference to a specific embodiment, the present invention is not limited thereto. For example, in this example, the grooves 7 constituting the high heat conductive portion 3 of the casting mold 1 were formed by machining after the main body 2 of the casting mold 1 was cast. It may be cast in a shape that incorporates the portion 'a7'. In this way, the step of forming grooves by machining can be omitted, making it possible to suppress manufacturing costs.
また、本実施例では、鋳造金型１の本体２を鋳造により
成形しているが、この鋳造金型の本体は鍛造材を用いて
鍛造により成形し、この鍛造成形の本体に溝を設け、配
管を鋳包むようにしてもよい。Further, in this embodiment, the body 2 of the casting die 1 is formed by casting, but the body of the casting die is formed by forging using a forging material, and a groove is provided in the body of the forging, The piping may be cast inside.
以上述べたように、本発明によれば、従来に比べ低融点
の材料で冷却水通路用の配管を鋳包むことができるので
、配管の溶融を防止でき、この鋳造金型を使って製品を
鋳造する場合、配管からの水漏れがなくなり、鋳造金型
の冷却水通路の亀裂および錆の発生を防止できる。As described above, according to the present invention, the piping for cooling water passages can be cast in a material with a lower melting point than conventional materials, so melting of the piping can be prevented, and products can be manufactured using this casting mold. When casting, there is no water leakage from piping, and the occurrence of cracks and rust in the cooling water passages of the casting mold can be prevented.
さらに、配管の肉厚も従来に比べ薄くすることができる
ので、その成形性も飛躍的に向上し、冷却効率の最も良
くなる形状に自由に成形できる。Furthermore, since the wall thickness of the piping can be made thinner than in the past, its moldability is dramatically improved, and it can be freely molded into a shape that provides the best cooling efficiency.
そのため、冷却水通路用の配管を鋳包む材料が高熱伝導
率でることとあいまって、鋳造金型の冷却性能を大幅に
向上させるたとができるという優れた効果を奏する。Therefore, in combination with the high thermal conductivity of the material used to encase the piping for the cooling water passages, this provides an excellent effect of greatly improving the cooling performance of the casting mold.
第１ａ図および第１ｂ図はそれぞれ本発明の一実施例に
係わる鋳造金型内鋳包み配管製作方法により製作した鋳
造金型の一部分を示す正面断面図および側面断面図、第
２ａ図〜第４ａ図および第２ｂ図〜第４ｂ図はそれぞれ
本発明の一実施例に係わる鋳造金型内鋳包み配管製作方
法の製造工程を説明するための鋳造金型の一部分の正面
断面図および側面断面図である。
第５ａ図および第５ｂ図はそれぞれ従来の方法で製造さ
れた鋳造金型、第６ａ図および第６ｂ図はそれぞれ従来
の他の方法で製造された鋳造金型である。
１・・・鋳造金型
２・・・本体
４・・・配管
５・・・冷却水通路
７・・・溝1a and 1b are a front sectional view and a side sectional view, respectively, showing a part of a casting mold manufactured by a method for manufacturing cast-in piping in a casting mold according to an embodiment of the present invention, and FIGS. 2a to 4a. Figures 2b to 4b are a front cross-sectional view and a side cross-sectional view of a part of a casting mold, respectively, for explaining the manufacturing process of a method for producing cast-in piping in a casting mold according to an embodiment of the present invention. be. FIGS. 5a and 5b each show a casting mold manufactured by a conventional method, and FIGS. 6a and 6b each show a casting mold manufactured by another conventional method. 1...Casting mold 2...Body 4...Piping 5...Cooling water passage 7...Groove
Claims (1)
型内鋳包み配管製作方法において、鋳鉄材を用いて鋳造
によりあるいは鍛造材を用いて鍛造により鋳造金型の本
体を成形した後に機械加工により、あるいは鋳造時また
は鍛造時において、鋳造金型の本体にキャビティの形状
に倣った形状をなし冷却水通路用の配管を収容するため
の溝を形成し、この溝に前記冷却水通路用の配管を配設
した後、この溝内に前記鋳造金型の本体および前記配管
に比べ低融点かつ高熱伝導率の材料の溶湯を流し込んで
前記配管を鋳包むことを特徴とする鋳造金型内鋳包み配
管製作方法。(1) In a casting mold cast-in piping manufacturing method in which piping for cooling water passages is cast inside a casting mold, the main body of the casting mold is formed by casting using cast iron material or by forging using forging material. After that, by machining or during casting or forging, a groove is formed in the main body of the casting mold to have a shape that follows the shape of the cavity and to accommodate the piping for the cooling water passage. After arranging piping for a water passage, casting characterized by casting a molten metal of a material having a lower melting point and higher thermal conductivity than the main body of the casting mold and the piping into the groove to enclose the piping. In-mold cast-in piping manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23657989A JPH0399767A (en) | 1989-09-12 | 1989-09-12 | Method for manufacturing internal chilling piping in casting metallic mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23657989A JPH0399767A (en) | 1989-09-12 | 1989-09-12 | Method for manufacturing internal chilling piping in casting metallic mold |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0399767A true JPH0399767A (en) | 1991-04-24 |
Family
ID=17002727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23657989A Pending JPH0399767A (en) | 1989-09-12 | 1989-09-12 | Method for manufacturing internal chilling piping in casting metallic mold |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0399767A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6158400A (en) * | 1999-01-11 | 2000-12-12 | Ford Global Technologies, Inc. | Internal combustion engine with high performance cooling system |
| JP2006289382A (en) * | 2005-04-06 | 2006-10-26 | Nissan Motor Co Ltd | Metallic die cooling structure and producing method thereof |
| KR100687530B1 (en) * | 1999-03-18 | 2007-02-27 | 에이에스엠 저펜 가부시기가이샤 | Plasma ??? Film-Forming Device |
| US20130160966A1 (en) * | 2010-05-18 | 2013-06-27 | Georg Fischer Dienstleistungen Gmbh | Die cast part of a die casting mold and corresponding die casting device |
| JP2013248868A (en) * | 2012-06-04 | 2013-12-12 | Toyota Motor East Japan Inc | Method of manufacturing injection molding metal mold |
| CN108788095A (en) * | 2018-06-20 | 2018-11-13 | 四川共享铸造有限公司 | The casting method of castingin oil duct steel pipe |
| US11072038B2 (en) | 2018-03-02 | 2021-07-27 | Toyota Jidosha Kabushiki Kaisha | Method of manufacturing mold |
-
1989
- 1989-09-12 JP JP23657989A patent/JPH0399767A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6158400A (en) * | 1999-01-11 | 2000-12-12 | Ford Global Technologies, Inc. | Internal combustion engine with high performance cooling system |
| KR100687530B1 (en) * | 1999-03-18 | 2007-02-27 | 에이에스엠 저펜 가부시기가이샤 | Plasma ??? Film-Forming Device |
| JP2006289382A (en) * | 2005-04-06 | 2006-10-26 | Nissan Motor Co Ltd | Metallic die cooling structure and producing method thereof |
| JP4650067B2 (en) * | 2005-04-06 | 2011-03-16 | 日産自動車株式会社 | Manufacturing method of mold cooling structure |
| US20130160966A1 (en) * | 2010-05-18 | 2013-06-27 | Georg Fischer Dienstleistungen Gmbh | Die cast part of a die casting mold and corresponding die casting device |
| JP2013248868A (en) * | 2012-06-04 | 2013-12-12 | Toyota Motor East Japan Inc | Method of manufacturing injection molding metal mold |
| US11072038B2 (en) | 2018-03-02 | 2021-07-27 | Toyota Jidosha Kabushiki Kaisha | Method of manufacturing mold |
| CN108788095A (en) * | 2018-06-20 | 2018-11-13 | 四川共享铸造有限公司 | The casting method of castingin oil duct steel pipe |
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