With more than 30 years of casting history, Wenzhou Longzhu Industrial Co., Ltd. has a large number of experienced casting engineers and technicians. We can produce castings of various sizes, shapes and materials according to the drawings provided by customers, especially in the field of valve castings. Cooperate with Fortune 500 companies for many years.
GS-C251.0619,WCB.WCC,LCB,LCC,LC3,4C,4D,WC6,C5,C12, C12A,CA15，CF3,CF8(-196’C),CF3M,CF8M,CF8C,CD4MCu,CK3MC uN,ZG200-400,ZG230-450,ZG270-500,2G40Cr1,ZG20CrM0.2G15C r1Mo1V,ZG35Cr1MO.ZG16CrMOG(1Cr5Mo),ZG1Cr13,ZGOCr18Ni9 Ti.5A.KmTB Cr26.4A
Resin sand casting, etc.
Sales manager： Mrs.peng E-mail: firstname.lastname@example.org
Tel： 0086-0577-86621768 Fax： 0086-0577-86621935
Address ： No.19 Longyong Road.Xiongxin Village. Longwan,Wenzhou,Zhejiang,China
LongZhu Foundry is the top custom investment casting manufacturer in China. We can supply all kinds of different investment casting parts in steel,iron ect. Pls contact us if you have any need for sand t casting solution!
Inquiry & Quotation
Buyers when sending a RFQ to investment casting foundry, should try to accurately explain in detail about material and technical quality requirements, such as the required machining sections, locating datum, heat treatment, surface treatment, packaging requirement, inspection and test items and the inspection report, etc. The annual requirements of the castings, the quantity of each order, and the place of delivery shall be provided. It is best to provide the weight of castings to facilitate the foundry quotation. The delivery cycle and payment terms are also important factors to be considered, which should be stated at the time of inquiry or quotation. Requirements about the casting quality should be economic, applicable and reasonable, on the premise of meet the use function, higher requirements will increase the difficulty of manufacturing, may also affect the production cost and price, this is not good for both purchaser and foundry.
Mould and Sample Confirmation
Production of investment casting starts from the mold design and manufacturing, mold production cost is generally listed in the quotation alone, is a one-time cost, and should be paid by the purchaser in advance. Of course, mould ownership generally belongs to the purchaser, can be preserved and used by the foundry, but both sides should reach an agreement at the start dealing for the mould.
Due to the need of process, when foundries need to modify the original drawing design, they should map casting or separately write amendments to purchaser for confirmation, then to make mold.
After the mould is ready, foundry need to provide samples to purchaser first to check the size, assembly, or do the necessary testing. Only after passing testing of the sample, can the buyer start mass production. Sometimes it is not very convenient to modify some sizes, for those out-of-tolerance dimensions that will not affect use function, customers can directly use and don’t require to modify mould. In this case, it is better to ask customer to modify the drawing tolerance according to actual samples, or written note when confirming sample, in order to avoid dispute when mass production in the future.
Afrer checking the drawing or sample, when the design is modified, proper mold fixing fee will be charged. So before making mould, purchasing party shall carefully review the drawings and keep good communication with the manufacturer.
Sample material generally should be consistent with drawings requirements, when it is difficult to make sample in required material, foundry should negotiate with buyer in advance. After getting agreement with the customer, foundry can use another kind of material with silimar or same shrinkage rate, but the sample will be only to used to check the size and geometry shape. Again when mass production, drawing material will be applied.
When the mould is tranferred from a foundry to another foundry, due to the using of different wax materials, shell materials and technological conditions, that may cause the change of the shrinkage rate, it is necessary to reconfirm the sample before bulk production.
1. After mold making, many dimensions of castings will be guaranteed by mold, foundry may pay attention to only a few important sizes when mass production. Purchaser needs to clear state the key control size, surface requirement and acceptance criteria.These key information will help to control the quality during production and improve the production efficiency.
2. Order in advance. Investment casting is different from mechanical processing, it is also different from die casting and other casting processes. During investment casting process, there are lots of auxiliary process, so the production cycle is long, it will require around a week time from injection, the shell making to pouring. Castings with holes or blind holes will need longer shell making drying time. Insufficient drying time will affect the casting surface quality and even lead to the casting scrap. After pouring, castings also need enough cooling time before turning to clean up process. So when purchsing, buyer should know the necessary shell making and cleaning time, and issue a purchase order in advance for on time delivery.
Still have any doubt about Casting China? Pls contact us immediately!