JPH0531450B2 - - Google Patents
Info
- Publication number
- JPH0531450B2 JPH0531450B2 JP22658885A JP22658885A JPH0531450B2 JP H0531450 B2 JPH0531450 B2 JP H0531450B2 JP 22658885 A JP22658885 A JP 22658885A JP 22658885 A JP22658885 A JP 22658885A JP H0531450 B2 JPH0531450 B2 JP H0531450B2
- Authority
- JP
- Japan
- Prior art keywords
- molding
- sand mold
- molding sand
- support frame
- mold
- 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.)
- Expired - Lifetime
Links
- 239000003110 molding sand Substances 0.000 claims description 33
- 238000001746 injection moulding Methods 0.000 claims description 15
- 239000012778 molding material Substances 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 3
- 239000007849 furan resin Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 230000035699 permeability Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- XPFVYQJUAUNWIW-UHFFFAOYSA-N furfuryl alcohol Chemical compound OCC1=CC=CO1 XPFVYQJUAUNWIW-UHFFFAOYSA-N 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- RRLHMJHRFMHVNM-BQVXCWBNSA-N [(2s,3r,6r)-6-[5-[5-hydroxy-3-(4-hydroxyphenyl)-4-oxochromen-7-yl]oxypentoxy]-2-methyl-3,6-dihydro-2h-pyran-3-yl] acetate Chemical compound C1=C[C@@H](OC(C)=O)[C@H](C)O[C@H]1OCCCCCOC1=CC(O)=C2C(=O)C(C=3C=CC(O)=CC=3)=COC2=C1 RRLHMJHRFMHVNM-BQVXCWBNSA-N 0.000 description 1
- -1 for example Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/34—Moulds having venting means
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、砂を樹脂で固めて成形した成形用砂
型を用いた射出成形装置、さらに詳しくいえば、
気密を保持できる支持枠内に前記成形用砂型を支
持して、溶融された成形材料を注入するととも
に、その支持枠内の空気を排出するようにした成
形用砂型を用いた射出成形装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an injection molding apparatus using a molding sand mold made by hardening sand with resin, and more specifically,
The present invention relates to an injection molding apparatus using a molding sand mold, in which the molding sand mold is supported within a support frame that can maintain airtightness, and a molten molding material is injected into the molding material, and air within the support frame is discharged.
（発明の背景技術）
第２図は、プランジヤ式の射出成形機の一例を
示した図である。(Background Art of the Invention) FIG. 2 is a diagram showing an example of a plunger type injection molding machine.
第２図において、１はホツパ、２は成形材料、
３はシリンダ、４は油圧装置、５はラム、６はト
ーピード、７はバンドヒータ、８はノズル、９は
金型である。 In Fig. 2, 1 is a hopper, 2 is a molding material,
3 is a cylinder, 4 is a hydraulic system, 5 is a ram, 6 is a torpedo, 7 is a band heater, 8 is a nozzle, and 9 is a mold.
ホツパ１からの成形材料２は、一定量ずつシリ
ンダ３に落下し、油圧装置４で駆動されるラム５
で押され、シリンダ３の内面とトーピード６との
間の通路を通り、ここでバンドヒータ７により十
分過熱され溶融状態になつて、ノズル８から金型
９内に射出される。 The molding material 2 from the hopper 1 falls into a cylinder 3 in fixed amounts, and a ram 5 driven by a hydraulic device 4
It passes through a passage between the inner surface of the cylinder 3 and the torpedo 6, where it is sufficiently heated by the band heater 7 to become molten and injected into the mold 9 from the nozzle 8.
（発明が解決しようとする問題点）
従来の射出成形機では、金型９のキヤビテイ９
ａ内の狭い部分や、ノズル８から離れた部分で成
形斑ができ、仕上がりが悪いという問題点があつ
た。(Problem to be solved by the invention) In the conventional injection molding machine, the cavity 9 of the mold 9
There was a problem in that molding spots were formed in the narrow part of a and in the part away from the nozzle 8, resulting in a poor finish.
本発明の目的は、気密を保持できる支持枠内に
支持された、砂を樹脂で固めて成形した成形用の
砂型に、溶融された成形材料を注入するととも
に、その支持枠内の空気を排出することにより、
キヤビテイ内の狭い部分やランナから離れた部分
の成形斑をなくし、仕上がりのよい成形品を造る
ことができる成形用砂型を用いた射出成形装置を
提供することにある。 The purpose of the present invention is to inject molten molding material into a molding sand mold made by hardening sand with resin, which is supported within an airtight support frame, and at the same time exhaust the air within the support frame. By doing so,
To provide an injection molding device using a molding sand mold, which can eliminate molding irregularities in narrow parts within a cavity and parts distant from a runner, and can produce molded products with a good finish.
（問題点を解決するための手段）
前記目的を達成するために本発明による成形用
砂型を用いた射出成形装置は、砂を樹脂で固めて
通気性をもつように成形され、第１および第２の
型によりキヤビテイを形成する成形用砂型と、
前記成形用砂型内に挿入され、前記キヤビテイ
に溶融した成形材料を注入する通路となるランナ
部材と、
前記成形用砂型の第１および第２の型に対応し
て分離でき、それらの型を支持して補強するとと
もに、内部を気密に保持できる支持枠と、
前記成形用砂型のキヤビテイ内に前記溶融され
た成形材料を注入しているときに前記支持枠内の
空気を排出する真空ポンプとから構成されてい
る。(Means for Solving the Problems) In order to achieve the above object, an injection molding apparatus using a molding sand mold according to the present invention is such that sand is hardened with resin and molded to have air permeability, and a molding sand mold that forms a cavity using a second mold; a runner member that is inserted into the molding sand mold and serves as a passage for injecting molten molding material into the cavity; a supporting frame that can be separated according to the molds, supports and reinforces the molds, and can keep the inside airtight; and a vacuum pump for discharging air within the support frame.
（実施例）
以下、図面等を参照して、実施例について本発
明を詳細に説明する。(Examples) Hereinafter, the present invention will be described in detail with regard to examples with reference to the drawings and the like.
第１図は、本発明による成形用砂型を用いた射
出成形装置の実施例を示した図である。 FIG. 1 is a diagram showing an embodiment of an injection molding apparatus using a molding sand mold according to the present invention.
なお、第２図に示した射出成形機と同様な機能
を果たす部分には、同一の符号が付してある。 Note that parts that perform the same functions as those of the injection molding machine shown in FIG. 2 are given the same reference numerals.
第１図において、１０は成形用砂型、１１は支
持枠、１２はランナ、１３は型締シリンダ、１４
はバルブ、１５は真空ポンプ、１６はバルブであ
る。 In FIG. 1, 10 is a molding sand mold, 11 is a support frame, 12 is a runner, 13 is a mold clamping cylinder, and 14
15 is a vacuum pump, and 16 is a valve.
成形用砂型１０は、砂を樹脂で固めて製作した
型である。砂としては、例えば、成形品の表面の
荒さによりフリーマントルの５号〜８号程度のも
のを用いる。樹脂としては、例えば、フルフラー
ルまたはフルフリルアルコールから得られるフラ
ン樹脂を用いる。このフラン樹脂は、砂の２％以
下の重量比で混合して製作する。 The molding sand mold 10 is a mold made by hardening sand with resin. As the sand, for example, Fremantle No. 5 to No. 8 sand is used depending on the roughness of the surface of the molded product. As the resin, for example, furan resin obtained from furfural or furfuryl alcohol is used. This furan resin is mixed with sand at a weight ratio of 2% or less.
成形用砂型１０は、支持枠１１で支持されてい
る。支持枠１１は、成形用砂型１０を支持して強
度を増加させるとともに、支持枠１１の内部を気
密に保つ働きをする。この支持枠１１の内側空間
には、適宜、冷却用のパイプを配設することがで
きる。 The molding sand mold 10 is supported by a support frame 11. The support frame 11 supports the molding sand mold 10 to increase its strength, and also functions to keep the inside of the support frame 11 airtight. In the inner space of this support frame 11, a cooling pipe can be appropriately arranged.
成形用砂型１０、支持枠１１はパーテングライ
ンＡ−Ａにより固定側と可動側の２つ部分に分割
することができる。固定側支持枠１１Ａに支持さ
れている固定側成形用砂型１０Ａは、ノズル８と
成形用砂型１０のキヤビテイ１０ａを接続するラ
ンナ部材１２が設けられている。ランナ部材１２
は、通気性のない材料で造られており、例えば、
金属製のパイプが用いられている。ランナ１２を
用いるのは、成形用砂型１０のキヤビテイ１０ａ
内への溶融された成形材料の注入を容易にすると
ともに、後述する真空ポンプ１５により支持枠１
１内を排気したときに、ランナ部の成形用砂型１
０内に溶融された成形材料が浸透してしまうのを
防止するためである。可動側支持枠１１Ｂおよび
これに支持されている可動側成形用砂型１０Ｂ
は、型締シリンダ１３により開閉駆動される。 The molding sand mold 10 and the support frame 11 can be divided into two parts, a fixed side and a movable side, along a parting line A-A. The fixed molding sand mold 10A supported by the fixed support frame 11A is provided with a runner member 12 that connects the nozzle 8 and the cavity 10a of the molding sand mold 10. Runner member 12
are made of non-breathable materials, e.g.
Metal pipes are used. The runner 12 is used in the cavity 10a of the molding sand mold 10.
In addition to facilitating the injection of molten molding material into the support frame 1, a vacuum pump 15 (described later)
When the inside of 1 is evacuated, the sand mold 1 for molding the runner part
This is to prevent the molten molding material from penetrating into the inside of the tube. Movable side support frame 11B and movable side molding sand mold 10B supported by this
is driven to open and close by the mold clamping cylinder 13.
支持枠１１の固定側１１Ａおよび可動側１１Ｂ
のそれぞれの一方側、バルブ１４，１４を介して
真空ポンプ１５，１５が接続されており、他方側
は、バルブ１６，１６を介して大気に接続されて
いる。 Fixed side 11A and movable side 11B of support frame 11
Vacuum pumps 15, 15 are connected via valves 14, 14 to one side of each, and the other side is connected to the atmosphere via valves 16, 16.
つぎに、本発明による本発明による成形用砂型
を用いた射出成形装置の動作を説明する。 Next, the operation of the injection molding apparatus using the molding sand mold according to the present invention will be explained.
シリンダ３内で溶融された樹脂は、ノズル８か
らランナ部材１２を介して、成形用砂型１０のキ
ヤビテイ１０ａ内に注入し始めるとともに、バル
ブ１４，１４を開にし、真空ポンプ１５，１５を
作動させることにより、キヤビテイ１０ａ内に溶
融した成形材料を圧入するとともに、吸引する。
このように、真空ポンプ１５，１５で成形用砂型
１０内にある空気を排出することにより、注入さ
れた溶融された成形材料は、キヤビデイ１０ａの
狭い部分やランナ１２から離れた部分にも引きつ
けられて成形の仕上がりがよくなる。 The resin melted in the cylinder 3 begins to be injected from the nozzle 8 through the runner member 12 into the cavity 10a of the molding sand mold 10, and the valves 14 and 14 are opened to operate the vacuum pumps 15 and 15. As a result, the molten molding material is press-fitted into the cavity 10a and is also sucked.
In this way, by discharging the air inside the molding sand mold 10 using the vacuum pumps 15, 15, the injected molten molding material is attracted to narrow parts of the cavity 10a and parts far from the runners 12. This will improve the molding finish.
樹脂の注入が完了したのちには、バルブ１６，
１６を開放して、外部の空気を支持枠１１内に吸
入して、成形用砂型１０の冷却を促進することが
できる。 After the resin injection is completed, the valve 16,
16 can be opened to draw outside air into the support frame 11 to facilitate cooling of the molding sand mold 10.
（発明の効果）
以上詳しく説明したように、本発明によれば、
気密を保持できる支持枠内に支持された、砂を樹
脂で固めて成形した成形用の砂型に、溶融された
成形材料を注入するとともに、その支持枠内の空
気を排出するようにしたので、キヤビテイ内の狭
い部分やランナから離れた部分の成形斑がなくな
り、仕上がりのよい成形品を造ることができると
いう効果がある。(Effects of the Invention) As explained in detail above, according to the present invention,
The molten molding material is injected into a molding sand mold made by solidifying sand with resin, which is supported within an airtight support frame, and the air within the support frame is exhausted. This has the effect of eliminating molding irregularities in narrow areas within the cavity and areas away from the runner, allowing molded products with a good finish to be produced.
第１図は、本発明による成形用砂型を用いた射
出成形装置の実施例を示した図である。第２図
は、プランジヤ式の射出成形機の一例を示した図
である。
１……ホツパ、２……成形材料、３……シリン
ダ、４……油圧装置、５……ラム、６……トーピ
ード、７……バンドヒータ、８……ノズル、９…
…金型、１０……成形用砂型、１１……支持枠、
１２……ランナ、１３……型締シリンダ、１４…
…バルブ、１５……真空ポンプ、１６……バル
ブ。
FIG. 1 is a diagram showing an embodiment of an injection molding apparatus using a molding sand mold according to the present invention. FIG. 2 is a diagram showing an example of a plunger type injection molding machine. 1... hopper, 2... molding material, 3... cylinder, 4... hydraulic system, 5... ram, 6... torpedo, 7... band heater, 8... nozzle, 9...
... Mold, 10 ... Sand mold for molding, 11 ... Support frame,
12...Runner, 13...Mold clamping cylinder, 14...
...Valve, 15...Vacuum pump, 16...Valve.
Claims (1)
れ、第１および第２の型によりキヤビテイを形成
する成形用砂型と、 前記成形用砂型内に挿入され、前記キヤビテイ
に溶融した成形材料を注入する通路となるランナ
部材と、 前記成形用砂型の第１および第２の型に対応し
て分離でき、それらの型を支持して補強するとと
もに、内部を気密に保持できる支持枠と、 前記成形用砂型のキヤビテイ内に前記溶融され
た成形材料を注入しているときに前記支持枠内の
空気を排出する真空ポンプとから構成した成形用
砂型を用いた射出成形装置。 ２ 前記成形用砂型は、フラン樹脂で固められて
いる特許請求の範囲第１項記載の成形用砂型を用
いた射出成形装置。 ３ 前記ランナ部材は、金属パイプである特許請
求の範囲第１項記載の成形用砂型を用いた射出成
形装置。 ４ 前記支持枠は、前記成形用砂型に前記溶融さ
れた成形材料を注入したのちに内部に冷却空気を
流入できるバルブを備えた特許請求の範囲第１項
記載の成形用砂型を用いた射出成形装置。[Scope of Claims] 1. A molding sand mold formed by solidifying sand with a resin so as to have air permeability, and forming a cavity using first and second molds; a runner member that serves as a passage for injecting molten molding material; and a runner member that can be separated corresponding to the first and second molds of the molding sand mold, supports and reinforces those molds, and keeps the inside airtight. An injection molding apparatus using a molding sand mold, which comprises: a support frame that can be used for molding; and a vacuum pump that exhausts air within the support frame while injecting the molten molding material into the cavity of the molding sand mold. . 2. An injection molding apparatus using a molding sand mold according to claim 1, wherein the molding sand mold is hardened with furan resin. 3. An injection molding apparatus using a molding sand mold according to claim 1, wherein the runner member is a metal pipe. 4. Injection molding using the molding sand mold according to claim 1, wherein the support frame is provided with a valve that allows cooling air to flow into the mold after the molten molding material is injected into the molding sand mold. Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22658885A JPS6285917A (en) | 1985-10-11 | 1985-10-11 | Injection molding unit utilizing sand mold for molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22658885A JPS6285917A (en) | 1985-10-11 | 1985-10-11 | Injection molding unit utilizing sand mold for molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6285917A JPS6285917A (en) | 1987-04-20 |
| JPH0531450B2 true JPH0531450B2 (en) | 1993-05-12 |
Family
ID=16847530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22658885A Granted JPS6285917A (en) | 1985-10-11 | 1985-10-11 | Injection molding unit utilizing sand mold for molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6285917A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03159708A (en) * | 1989-11-17 | 1991-07-09 | Sintokogio Ltd | Mold apparatus |
| EP1254731A1 (en) * | 1999-10-14 | 2002-11-06 | Yugen Kaisha Esumorudo | Die casting method, die-cast article, and die casting machine |
| ES1091830Y (en) * | 2013-08-29 | 2014-01-21 | Simplicity Works Europe Sl | MOLD FOR OBTAINING THREE-DIMENSIONAL ITEMS |
-
1985
- 1985-10-11 JP JP22658885A patent/JPS6285917A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6285917A (en) | 1987-04-20 |
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