TW201900296A - Runner protection tube for casting and manufacturing method thereof - Google Patents
Runner protection tube for casting and manufacturing method thereof Download PDFInfo
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- TW201900296A TW201900296A TW106115249A TW106115249A TW201900296A TW 201900296 A TW201900296 A TW 201900296A TW 106115249 A TW106115249 A TW 106115249A TW 106115249 A TW106115249 A TW 106115249A TW 201900296 A TW201900296 A TW 201900296A
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本發明是有關於一種鑄造用澆道保護管及其製造方法，且特別是有關於一種同時利用熱固性樹脂及熱塑性樹脂製成的鑄造用澆道保護管及其製造方法。The present invention relates to a casting sprue protection tube and a method of manufacturing the same, and more particularly to a casting sprue protection tube made of a thermosetting resin and a thermoplastic resin, and a method of manufacturing the same.
鑄造用澆道保護管為鑄造業廣泛使用的技術之一。現有技術中，通常都採用陶瓷等耐火材料製作鑄造用澆道保護管，其製作過程是先製成管狀生坯，乾燥後進行高溫燒製成耐火陶瓷管。使用鑄造用澆道保護管時，將其埋入型砂內，以成為鐵水進入型腔的通道。鑄造用澆道保護管的基本功能是確保鐵水流動過程中不會造成沖砂、黏砂，鐵水冷卻後不黏鐵、不黏砂。實質上，鑄造用澆道保護管是利用材料的耐火性質使鐵水與型砂隔離，以達到上述目的。然而，習知的鑄造用澆道保護管在耐火度、強度、防水性及高溫穩定性等方面均存在有待改良精進的空間。Casting sprue protection tubes are one of the widely used techniques in the foundry industry. In the prior art, a casting sprue protection tube is usually produced by using a refractory material such as ceramics, and the manufacturing process is to first form a tubular green body, and then dry and then fire at a high temperature to form a refractory ceramic tube. When using a casting sprue protection tube, it is buried in the molding sand to become a passage for molten iron to enter the cavity. The basic function of the casting sprue protection tube is to ensure that the molten iron does not cause sand washing and sanding during the flow of the molten iron, and the molten iron does not stick to iron or adhere to the sand after cooling. In essence, the casting sprue protection tube utilizes the refractory properties of the material to isolate the molten iron from the molding sand to achieve the above object. However, conventional casting sprue protection tubes have room for improvement in terms of refractoriness, strength, water repellency, and high temperature stability.
基於上述，發展出一種能夠兼具良好的耐火度、強度、防水性及高溫穩定性的鑄造用澆道保護管，為目前所需研究的重要課題。Based on the above, a casting sprue protection tube capable of achieving both good refractoriness, strength, water resistance and high temperature stability has been developed, which is an important subject for current research.
本發明提供一種鑄造用澆道保護管及其製造方法，所述鑄造用澆道保護管兼具良好的耐火度、強度、防水性及高溫穩定性。The invention provides a casting sprue protection tube and a manufacturing method thereof, and the casting sprue protection tube has good refractoriness, strength, water resistance and high temperature stability.
本發明的鑄造用澆道保護管是由漿料組成物製成，漿料組成物包括有機纖維、無機纖維、熱固性樹脂、熱塑性樹脂、無機粒子及無機黏結劑。The casting sprue protection tube of the present invention is made of a slurry composition including organic fibers, inorganic fibers, thermosetting resins, thermoplastic resins, inorganic particles, and inorganic binders.
在本發明的一實施例中，以漿料組成物的總重量計，有機纖維的使用量為10 wt%至25 wt%，無機纖維的使用量為1 wt%至15 wt%，熱固性樹脂的使用量為5 wt%至20 wt%，熱塑性樹脂的使用量為1 wt%至15 wt%，無機粒子的使用量為10 wt%至70 wt%，無機黏結劑的使用量為1 wt%至10 wt%。In an embodiment of the invention, the organic fiber is used in an amount of 10 wt% to 25 wt%, and the inorganic fiber is used in an amount of 1 wt% to 15 wt%, based on the total weight of the slurry composition, of the thermosetting resin. The amount used is from 5 wt% to 20 wt%, the amount of the thermoplastic resin used is from 1 wt% to 15 wt%, the amount of inorganic particles used is from 10 wt% to 70 wt%, and the amount of inorganic binder used is from 1 wt% to 10 wt%.
在本發明的一實施例中，有機纖維包括紙漿。In an embodiment of the invention, the organic fibers comprise pulp.
在本發明的一實施例中，無機纖維包括陶瓷纖維。In an embodiment of the invention, the inorganic fibers comprise ceramic fibers.
在本發明的一實施例中，陶瓷纖維包括CaO-MgO系的陶瓷纖維。In an embodiment of the invention, the ceramic fibers comprise ceramic fibers of the CaO-MgO system.
在本發明的一實施例中，熱固性樹脂包括酚醛樹脂。In an embodiment of the invention, the thermosetting resin comprises a phenolic resin.
在本發明的一實施例中，熱塑性樹脂包括壓克力樹脂。In an embodiment of the invention, the thermoplastic resin comprises an acrylic resin.
在本發明的一實施例中，無機粒子包括土狀石墨、雲母粉、矽灰粉或二氧化矽。In an embodiment of the invention, the inorganic particles comprise earthy graphite, mica powder, ash powder or cerium oxide.
在本發明的一實施例中，無機黏結劑包括矽酸膠液。In an embodiment of the invention, the inorganic binder comprises a phthalic acid glue.
本發明的鑄造用澆道保護管的製造方法包括以下步驟。將有機纖維、無機纖維、熱固性樹脂、熱塑性樹脂、無機粒子及無機黏結劑依序加入水中攪拌均勻以製備漿料，並加水稀釋漿料。接著，通過成型模具對漿料機械成型，以形成鑄造用澆道保護管的濕紙坯體。之後，對濕紙坯體在50℃至100℃的低溫下進行烘乾，並於120℃至200℃的溫度下進行熱壓整形，以製成鑄造用澆道保護管。The method for producing a casting sprue protection tube of the present invention comprises the following steps. The organic fiber, the inorganic fiber, the thermosetting resin, the thermoplastic resin, the inorganic particles, and the inorganic binder are sequentially added to water and stirred uniformly to prepare a slurry, and the slurry is diluted with water. Next, the slurry is mechanically molded by a molding die to form a wet paper blank for the casting sprue protection tube. Thereafter, the wet paper body is dried at a low temperature of 50 ° C to 100 ° C, and subjected to hot press shaping at a temperature of 120 ° C to 200 ° C to prepare a casting sprue protection tube.
基於上述，本發明提出一種鑄造用澆道保護管，其中包含可增加結構強度的生物可分解CaO-MgO系陶瓷纖維，同時含有具有防潮功能且可提升耐火溫度的熱固性樹脂以及能夠增加紙張強度的熱塑性樹脂，因此，本發明的鑄造用澆道保護管可兼具良好的耐火度、強度、防水性及高溫穩定性，並符合現今產業所提倡的環保需求。Based on the above, the present invention provides a casting sprue protection tube comprising a biodegradable CaO-MgO-based ceramic fiber capable of increasing structural strength, and a thermosetting resin having a moisture-proof function and an improved refractory temperature and an increase in paper strength. The thermoplastic resin, therefore, the casting sprue protection tube of the present invention can have both good refractoriness, strength, water repellency and high temperature stability, and meets the environmental protection requirements advocated by the industry today.
為讓本發明的上述特徵和優點能更明顯易懂，下文特舉實施例，並作詳細說明如下。The above described features and advantages of the present invention will become more apparent from the following description.
以下，將詳細描述本發明的實施例。然而，這些實施例為例示性，且本發明揭露不限於此。Hereinafter, embodiments of the invention will be described in detail. However, these embodiments are illustrative, and the disclosure of the present invention is not limited thereto.
本發明提供一種鑄造用澆道保護管，其由用於形成鑄造用澆道保護管的漿料組成物製成，漿料組成物包括有機纖維、無機纖維、熱固性樹脂、熱塑性樹脂、無機粒子及無機黏結劑。以下將詳細說明所提到的成分。＜ 有機纖維 ＞ The present invention provides a casting sprue protection tube which is made of a slurry composition for forming a casting sprue protection tube, and the slurry composition comprises organic fibers, inorganic fibers, thermosetting resins, thermoplastic resins, inorganic particles and Inorganic binder. The ingredients mentioned are explained in detail below. < organic fiber >
本發明的有機纖維可包括紙漿，例如是廢紙紙漿，亦即，可將廢紙與水製備成紙漿。因此，本發明可將廢紙進行回收二次利用，符合現今產業所提倡的環保與綠能需求。以漿料組成物的總重量計，有機纖維的使用量例如是10 wt%至25 wt%。但本發明不以此為限，亦可以是其他材料，例如紙纖維、再生纖維、木材纖維、木棉、竹纖維、稻草等。＜ 無機纖維 ＞ The organic fibers of the present invention may comprise pulp, such as waste paper pulp, i.e., waste paper and water may be prepared into pulp. Therefore, the present invention can recycle the waste paper for secondary use, which is in line with the environmental protection and green energy demand advocated by the industry today. The organic fiber is used in an amount of, for example, 10% by weight to 25% by weight based on the total weight of the slurry composition. However, the invention is not limited thereto, and may be other materials such as paper fibers, recycled fibers, wood fibers, kapok, bamboo fibers, straw, and the like. < Inorganic fiber >
本發明的無機纖維可包括陶瓷纖維，以漿料組成物的總重量計，無機纖維的使用量例如是1 wt%至15 wt%，增加陶瓷纖維使用量可以增加鑄造用澆道保護管結構強度及耐火度。更具體而言，本發明所使用的陶瓷纖維例如是CaO-MgO系的陶瓷纖維，相較於習知技術中使用矽酸鋁陶瓷纖維、鋯矽酸鋁陶瓷纖維、石綿或玻璃纖維等致癌物或潛在的致癌物，本發明選用人體更容易排出的CaO-MgO系的陶瓷纖維，其為一種生物可分解纖維。因此，本發明在提升鑄造用澆道保護管的結構強度及耐火度的同時，更兼顧對人體的無毒性及環境友善性。但本發明不以此為限，亦可以是其他材料，例如陶瓷纖維、礦物纖維、矽土纖維、金屬纖維、玻璃纖維、碳纖維等。＜ 熱固性樹脂 ＞ The inorganic fiber of the present invention may comprise ceramic fiber. The inorganic fiber is used in an amount of, for example, 1 wt% to 15 wt% based on the total weight of the slurry composition. Increasing the amount of ceramic fiber used may increase the structural strength of the cast runner protection tube. And refractoriness. More specifically, the ceramic fiber used in the present invention is, for example, a CaO-MgO-based ceramic fiber, which is a carcinogen such as aluminum silicate ceramic fiber, aluminum zirconate ceramic fiber, asbestos or glass fiber, which is used in the prior art. Or a potential carcinogen, the present invention selects a ceramic fiber of CaO-MgO system which is more easily discharged by the human body, which is a biodegradable fiber. Therefore, the present invention improves the structural strength and refractoriness of the casting sprue protection tube while taking into account the non-toxicity and environmental friendliness of the human body. However, the invention is not limited thereto, and may be other materials such as ceramic fibers, mineral fibers, alumina fibers, metal fibers, glass fibers, carbon fibers, and the like. < thermosetting resin >
本發明的熱固性樹脂可包括酚醛樹脂，以漿料組成物的總重量計，熱固性樹脂的使用量例如是5 wt%至20 wt%。熱固性樹脂在本發明鑄造用澆道保護管的製造中可作為有機黏結劑。必須說明的是，本發明所使用的酚醛樹脂是目前所知耐火溫度最高的熱固形樹脂，也是碳化率最高的樹脂，在缺氧情況下酚醛樹脂遇高溫會乾餾變成炭化物，而炭化物具有耐高溫的特性。同時，酚醛樹脂也具有防潮功能，添加適量的酚醛樹脂可讓紙纖維防潮。因此，本發明使用酚醛樹脂作為熱固性樹脂以製作鑄造用澆道保護管，能夠提升鑄造用澆道保護管的耐火溫度及防潮性。但本發明不以此為限，亦可以是其他材料，例如澱粉、糊精、玉米糖膠。＜ 熱塑性樹脂 ＞ The thermosetting resin of the present invention may include a phenol resin, and the amount of the thermosetting resin used is, for example, 5 wt% to 20 wt%, based on the total weight of the slurry composition. The thermosetting resin can be used as an organic binder in the manufacture of the casting sprue protection tube of the present invention. It should be noted that the phenolic resin used in the present invention is a thermosetting resin having the highest refractory temperature, and is also the resin having the highest carbonization rate. In the absence of oxygen, the phenolic resin is dry-distilled into a carbonized product at a high temperature, and the carbonized material has a high temperature resistance. Characteristics. At the same time, the phenolic resin also has a moisture-proof function, and the addition of an appropriate amount of phenolic resin can make the paper fiber moisture-proof. Therefore, the present invention uses a phenol resin as a thermosetting resin to produce a casting sprue protection tube, which can improve the fire resistance temperature and moisture resistance of the casting sprue protection tube. However, the invention is not limited thereto, and may be other materials such as starch, dextrin, and corn syrup. < thermoplastic resin >
本發明的熱塑性樹脂可包括壓克力樹脂，以漿料組成物的總重量計，熱塑性樹脂的使用量例如是1 wt%至15 wt%。熱塑性樹脂在本發明鑄造用澆道保護管的製造中可作為有機黏結劑及紙張增強劑，不但有助於後段整形製程且具有防水性，更具有增加紙張強度的作用。但本發明不以此為限，亦可以是其他材料，例如乙烯/醋酸乙烯酯(EVA)共聚物、聚乙烯醇（PVA）、乙酸乙烯酯、聚乙烯吡咯烷酮(PVP)或乳膠等。＜ 無機粒子 ＞ The thermoplastic resin of the present invention may include an acrylic resin in an amount of, for example, 1 wt% to 15 wt% based on the total weight of the slurry composition. The thermoplastic resin can be used as an organic binder and a paper reinforcing agent in the manufacture of the casting sprue protection tube of the present invention, which not only contributes to the rear-end shaping process but also has water repellency and has the effect of increasing the strength of the paper. However, the invention is not limited thereto, and may be other materials such as ethylene/vinyl acetate (EVA) copolymer, polyvinyl alcohol (PVA), vinyl acetate, polyvinylpyrrolidone (PVP) or latex. < Inorganic Particles >
本發明的無機粒子可包括土狀石墨、雲母粉、矽灰粉或二氧化矽，以漿料組成物的總重量計，無機粒子的使用量例如是10 wt%至70 wt%。更詳細而言，石墨在缺氧情況下耐溫超過2000℃甚至更可以達到2200℃，在鑄件裏頭就是屬於缺氧狀態。雲母在950℃會有相變化，變成具有陶瓷效果的材質，可以增加熱間強度，但也不能添加太多，因為相變過程是容易被鐵水穿刺的時間點，若過度陶瓷化則有礙後續製程的進行。矽灰粉即為一般常用之飛灰(fly ash)，其為火力發電廠在燃燒粉碳後所產生的廢棄物，當粉煤在經過火爐高溫區域時，揮發性物質被燒掉，而存在粉煤中之黏土與石英等礦物雜質在高溫下被融化，其中產生之氫氣與氮氣會將融化物鼓起，形成中空體或破裂中空體，這些物質最後被送到低溫區，經冷卻變成玻璃圓球狀微粒子，大部分微粒子會隨著高溫排出，並利用集塵器捕捉收集而成。二氧化矽為常見便宜的耐火材，因為材質跟鑄造用砂模一樣，所以有相同的膨脹係數，當添加量例如是10%至30%時，可以避免澆鑄過程中紙管膨脹係數和砂模不一致產生裂痕。但本發明不以此為限，亦可以是其他材料，例如石英粉、三水鋁石、氧化鋁、氧化鎂、鋯英粉、臘石粉、滑石粉、長石粉、高嶺土、橄欖石粉、空心氧化鋁等。＜ 無機黏結劑 ＞ The inorganic particles of the present invention may include earthy graphite, mica powder, ash powder or cerium oxide, and the inorganic particles are used in an amount of, for example, 10% by weight to 70% by weight based on the total weight of the slurry composition. In more detail, the graphite can withstand temperatures in excess of 2000 ° C or even 2200 ° C in the absence of oxygen, and is in an oxygen-deficient state in the casting. Mica will change phase at 950 °C, and it will become a ceramic effect material, which can increase the heat strength, but it can't add too much, because the phase change process is a time point that is easily puncture by molten iron. If excessive ceramization is harmful, it will hinder. Follow-up process. The ash powder is the commonly used fly ash, which is the waste generated by the thermal power plant after burning the powdered carbon. When the pulverized coal passes through the high temperature zone of the furnace, the volatile matter is burned off and exists. The mineral impurities such as clay and quartz in the pulverized coal are melted at a high temperature, and the hydrogen and nitrogen generated therein will swell the melt to form a hollow body or a ruptured hollow body, and these materials are finally sent to the low temperature region and cooled to become glass. Spherical particles, most of which are discharged at high temperatures and captured by a dust collector. Ceria is a common and inexpensive refractory material. Because the material is the same as the casting sand mold, it has the same expansion coefficient. When the addition amount is, for example, 10% to 30%, the expansion coefficient of the paper tube and the sand mold during the casting process can be avoided. Inconsistent cracks. However, the invention is not limited thereto, and may be other materials such as quartz powder, gibbsite, alumina, magnesia, zircon powder, wax powder, talc powder, feldspar powder, kaolin, olivine powder, hollow oxidation. Aluminum and so on. < Inorganic binder >
本發明的無機黏結劑可包括矽酸膠液，以漿料組成物的總重量計，無機黏結劑的使用量例如是1 wt%至10 wt%。更詳細而言，矽酸膠液具有優良的高溫穩定性(熱間強度)、耐高溫1500-1600℃、黏結性、成膜性、比表面積大等性能，因此，可改善所製成的鑄造用澆道保護管的高溫穩定性(熱間強度)。但本發明不以此為限，亦可以是其他材料，例如硫酸鹽、磷酸鹽、硼酸鹽、膨潤土等。The inorganic binder of the present invention may include a phthalic acid gum, and the inorganic binder is used in an amount of, for example, 1 wt% to 10 wt% based on the total weight of the slurry composition. In more detail, the tannic acid glue has excellent properties such as high temperature stability (heat strength), high temperature resistance of 1500-1600 ° C, adhesiveness, film formability, large specific surface area, and the like, thereby improving the casting produced. Use a sprue to protect the tube from high temperature stability (heat between strength). However, the invention is not limited thereto, and may be other materials such as sulfate, phosphate, borate, bentonite and the like.
本發明亦提出製造上述鑄造用澆道保護管的方法，由於漿料組成物中所包含的有機纖維、無機纖維、熱固性樹脂、熱塑性樹脂、無機粒子及無機黏結劑已於上文中詳述，故在說明鑄造用澆道保護管的製造方法時省略有關製造原料的細節描述。The present invention also proposes a method for manufacturing the above-described casting sprue protection tube. Since the organic fiber, the inorganic fiber, the thermosetting resin, the thermoplastic resin, the inorganic particles and the inorganic binder contained in the slurry composition have been described in detail above, A detailed description about the manufacturing raw material is omitted in explaining the manufacturing method of the casting sprue protection tube.
本發明提供一種鑄造用澆道保護管的製造方法，包括以下步驟。The present invention provides a method of manufacturing a casting sprue protection tube comprising the following steps.
首先，將有機纖維、無機纖維、熱固性樹脂、熱塑性樹脂、無機粒子及無機黏結劑依序加入水中攪拌均勻以製備漿料。以重量而言，水的添加量是漿料組成物的添加量的3至5倍。更詳細而言，加入有機纖維後攪拌5分鐘至10分鐘，加入無機纖維後攪拌3分鐘至5分鐘，加入熱固性樹脂、熱塑性樹脂、無機粒子及無機黏結劑，攪拌3分鐘至5分鐘。若攪拌時間過久，超出上述時間段，則無機纖維容易起毛球。漿料製備完畢之後，排洩到儲存槽，並加水稀釋，稀釋至水料比0.5 %至3 %(水:料=97:3)。First, organic fibers, inorganic fibers, thermosetting resins, thermoplastic resins, inorganic particles, and inorganic binders are sequentially added to water and stirred uniformly to prepare a slurry. The amount of water added is 3 to 5 times the amount of the slurry composition added by weight. More specifically, after adding the organic fiber, the mixture is stirred for 5 minutes to 10 minutes, the inorganic fiber is added, and the mixture is stirred for 3 minutes to 5 minutes, and a thermosetting resin, a thermoplastic resin, inorganic particles, and an inorganic binder are added, and the mixture is stirred for 3 minutes to 5 minutes. If the stirring time is too long and exceeds the above period, the inorganic fibers are likely to pilling. After the slurry is prepared, it is drained to a storage tank and diluted with water, and diluted to a water to material ratio of 0.5% to 3% (water: material = 97:3).
接著，通過成型模具對漿料機械成型，以形成鑄造用澆道保護管的濕紙坯體。Next, the slurry is mechanically molded by a molding die to form a wet paper blank for the casting sprue protection tube.
在模具部分，模具結構由網模、上模與下模組成的背腔、氣室和模具支座組成。其中網模是模具的主體，網模由直徑0.15 mm~0.25 mm、30~40目不銹鋼網，通過焊接方式貼附在模具型腔工作表面。模具工作面與背腔之間由均勻的小孔聯通。模具通過模具支座安裝在成型機的範本上，範本的另一面安裝有氣室，氣室與背腔相通，氣室壁上設有兩個通壓縮空氣或抽真空的通道。然而，本發明並不以此為限，亦可使用其他習知成型模具結構以對漿料機械成型。In the mold part, the mold structure is composed of a mesh mold, a back cavity composed of an upper mold and a lower mold, a gas chamber and a mold support. The net mold is the main body of the mold, and the net mold is made of stainless steel mesh with a diameter of 0.15 mm~0.25 mm and 30-40 mesh, and is attached to the working surface of the mold cavity by welding. A uniform small hole is communicated between the working face of the mold and the back cavity. The mold is mounted on the mold of the molding machine through the mold support. The other side of the template is equipped with a gas chamber, and the gas chamber is connected with the back chamber. The air chamber wall is provided with two passages for compressing air or evacuating. However, the invention is not limited thereto, and other conventional molding die structures may be used to mechanically form the slurry.
更詳細而言，將成型上模和下模在合模的狀態同時沉入漿液裡通過真空泵吸漿5秒至10秒，真空壓0.04至0.09MPa，以管厚4mm來決定吸漿時間。上模和下模在合模的狀態上浮開始脫水5秒至10秒。下模通入正壓(吹氣)，同時上模通入負壓(吸氣)將產品轉移至上模，下模下降即分模；接料板移進，上模通入正壓將產品吹至接料板上，接料板移出，下模上升至合模，如此迴圈以得到所需的產品。More specifically, the molding upper mold and the lower mold are simultaneously sunk into the slurry in a state of being clamped, and are sucked by a vacuum pump for 5 seconds to 10 seconds, a vacuum pressure of 0.04 to 0.09 MPa, and a tube thickness of 4 mm to determine the suction time. The upper and lower dies are dehydrated for 5 seconds to 10 seconds in the state of clamping. The lower die is fed with positive pressure (blowing), while the upper die is fed with negative pressure (suction) to transfer the product to the upper die, and the lower die is lowered to split the die; the receiving plate is moved in, and the upper die is fed with positive pressure to blow the product. On the receiving plate, the receiving plate is removed, the lower die is raised to the clamping, and the loop is looped to obtain the desired product.
之後，對濕紙坯體進行低溫烘乾及熱壓整形，以製成鑄造用澆道保護管。更詳細而言，在成型後盡速使用烘箱以低溫烘乾50℃至100℃乾燥10分鐘至1小時。使用金屬模作為乾燥模，於金屬模上形成連通模腔形成面與外部之多個連通孔。將半乾至八分乾紙坯體移載至加熱至120℃至200℃之乾燥模中，並且自乾燥模之上方開口部插入袋狀之彈性模芯，於密閉之乾燥模內，對彈性模芯內注入加壓空氣(4 Kg/cm3 至8 Kg/cm3 )，使彈性模芯膨脹，利用彈性模芯將濕紙坯體按壓至乾燥模之內面，提高鑄造用澆道保護管密度與結構強度，並加以整形。進行加壓乾燥(15秒鐘至60秒鐘)後，除去彈性模芯內之加壓空氣，使彈性模芯收縮，自乾燥模內取出，將成型體自乾燥模內取出並冷卻，以製成鑄造用澆道保護管。Thereafter, the wet paper body is subjected to low temperature drying and hot press forming to form a casting sprue protection tube. In more detail, after drying, the oven is dried at a low temperature for 50 minutes to 100 ° C for 10 minutes to 1 hour. A metal mold is used as a dry mold, and a plurality of communication holes that communicate with the cavity forming surface and the outside are formed on the metal mold. Transfer the semi-dry to eight-part dry paper blank to a drying mold heated to 120 ° C to 200 ° C, and insert a bag-shaped elastic core from the upper opening of the drying mold, in a closed dry mold, for elasticity Injecting pressurized air (4 Kg/cm 3 to 8 Kg/cm 3 ) into the core to expand the elastic core, and pressing the wet paper blank to the inner surface of the dry mold by the elastic core to improve the casting sprue protection Tube density and structural strength are shaped and shaped. After pressure drying (15 seconds to 60 seconds), the pressurized air in the elastic core is removed, the elastic core is shrunk, taken out from the drying mold, and the molded body is taken out from the drying mold and cooled. Into the casting sprue protection tube.
綜上所述，本發明提出一種鑄造用澆道保護管，其中包含可增加結構強度的生物可分解CaO-MgO系陶瓷纖維，同時含有具有防潮功能且可提升耐火溫度的熱固性樹脂以及能夠增加紙張強度的熱塑性樹脂。並且，更可將廢紙進行回收二次利用以製成鑄造用澆道保護管。因此，本發明的鑄造用澆道保護管可兼具良好的耐火度、強度、防水性及高溫穩定性，並符合現今產業所提倡的環保及綠能需求，更兼顧對人體的無毒性及環境友善性。In summary, the present invention provides a casting sprue protection tube comprising a biodegradable CaO-MgO ceramic fiber which can increase the structural strength, and a thermosetting resin having a moisture-proof function and an improved refractory temperature, and capable of adding paper. A thermoplastic resin of strength. Moreover, the waste paper can be recycled for secondary use to form a casting sprue protection tube. Therefore, the casting sprue protection tube of the present invention can have good refractoriness, strength, water resistance and high temperature stability, and meets the environmental protection and green energy requirements advocated by the industry today, and also has no toxicity to the human body and environment. Friendly.
雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.
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