熱芯盒跑砂產(chǎn)生孔洞的解決辦法

Solution of hole in hot core box running sand

1.1熱芯盒制芯

1.1 core box core making

硬化快，生產(chǎn)率高，砂芯強度高，尺寸準確，表面光潔潰散性好，工藝簡單，便于自動化，適合批量生產(chǎn)。由于熱芯盒制芯的這些優(yōu)點，我廠WD615機體水套芯就選用熱芯盒射芯機作為車間的主要設(shè)備。射芯機投產(chǎn)后，對鑄件質(zhì)量和產(chǎn)量的提高作出了很大貢獻。但隨著產(chǎn)量的提高，一些制約砂芯質(zhì)量和產(chǎn)量的問題也開始出現(xiàn)。芯盒的高使用率，設(shè)備問題，芯砂質(zhì)量和操作者的操作水平等。造成熱芯盒制芯生產(chǎn)中一些問題比較突出。如：芯盒跑砂使維修芯盒頻率增加，對制芯生產(chǎn)和砂芯質(zhì)量造成影響。在生產(chǎn)任務(wù)較緊時，一旦送修模具，還可能會造成整條生產(chǎn)線的停產(chǎn)。如何才能解決呢？經(jīng)過長期觀察，我任為芯盒跑砂是由于射砂時芯盒合模不嚴和排氣不暢所致。

Fast hardening, high productivity, high sand core strength, accurate size, good surface collapsibility, simple process, easy automation, suitable for mass production. Because of the advantages of hot core box making, WD615 core water core of our plant is selected as the main equipment of the workshop. After the core machine was put into operation, it greatly contributed to the improvement of casting quality and output. But with the increase of production, some problems that restrict the quality and yield of sand core also begin to appear. The core box has high utilization rate, equipment problems, core sand quality and operator's operation level. There are some problems in the production of hot box core making. For example, the core box running sand increases the frequency of repair core box, which has an impact on the core production and core quality. When the production task is tight, once the mold is repaired, it may cause the whole production line to stop production. How can we solve it? After a long observation, I was running sand as the core box because of the poor mold clamping and poor ventilation.

1.2具體解決辦法。

1.2 specific solutions.

工裝合模不嚴時，調(diào)整工裝或設(shè)備是完全能解決問題的。

When the tooling is not strict, adjusting the tooling or equipment can completely solve the problem.

射砂時，芯砂在高壓砂氣流作用下射進芯腔內(nèi)，大部分氣流從工裝原有的排氣塞或排氣道內(nèi)排出，一部分排出不及，必然從芯盒間隙大處排出，不久就使工裝磨損。最直接的解決辦法就是對磨損處進行焊補，但不能解決再次跑砂磨損芯盒。怎樣才能徹底解決問題呢，于是我想到了加排氣塞的辦法。具體做法就是在靠近跑砂部位內(nèi)平面加適量排氣塞。如圖A使易跑砂部位的余氣全部排出。一次性修復改造，解決了芯盒跑砂問題，，減少了芯盒送修次數(shù)和維修成本。

In sand shooting, the core sand is ejected into the core cavity under the action of high pressure sand air flow. Most of the air flow is discharged from the original exhaust plug or exhaust duct in the tooling. Part of the discharge is less than that of the core box. The most direct solution is to weld and repair the worn parts, but it can not solve the core of running sand again. How to solve the problem thoroughly, so I thought of the way of adding an exhaust plug. The specific method is to add a suitable amount of exhaust plug to the surface of the sand near the running place. As in figure A, all the residual gas in the easy run sand part is discharged. The one-time repair and transformation has solved the problem of sand running in the core box, and reduced the repair times and maintenance costs of the core box.