• QC/Technical Support

Our general manager oversees our staff members and our QC department. Every QC member has received professional training. Ourquality control system covers every processing stage from the initial materials inspection to the completed product inspection in accordance with ISO 9001 standard.

• Procedures

a) Full inspection on all dimensions, characteristics, and notes on drawing for each sample submitted.
b) Critical dimensions.
c) Process Flow Diagram, Design FMEA, Process FMEA, Control Plan, Material Specifications.
d) Calibration and R&R on measurement system for all checking aids for any critical dimensions or requirements.

• QC Staff

15--20

Specifications

In 1998 year, we set up our die casting factory near our foundry, it takes 5minutes there. There were only two diecasting equipments. By 2009 year, we have eight sets of die-casting equipment ranging from 125T to 1,250T, Including one set 125T machine, one set 180T machining, one set 225T machine, two set 280T machine, one set 500T machine, one set 800T machine, one set 1250T machine. Now Dongrun casting is leading the industry in high pressure die castings in Yongkang City.

How to design die casting tooling is the key for the tolerance, finish and strength. There is a mold city in Yongkang City which is the biggest mold industry in Zhejiang Province, China. It takes 15 minutes to the mold city from our factory.

We can make the weigh of range from 0.01kg to 15kg/pcs for aluminum pressure die castings, it is including lighting components, gearbox, brake system, engineer components, bike components.

Introduction : Aluminium Die Casting

Die-casting mould is made form steel and similar as permanent mold casting, suitable for aluminum alloy, zinc alloy and copper alloy. Now Dongrun is only an aluminum die casting manufacture, not for other metal. The die cast which the melted die cast aluminum is injected into the moulds under high pressure of 10—20Mpa. The thickness of die cast part is mini 2mm, the draft angle of die cast is 0.5º. The finish of diecasting is the best in sand casting process and die casting process.

The machine is made up of two vertical platens. One platen is fixed and other is moving, can open and closed. When the melted aluminum alloy is poured into the shot sleeve, the shot sleeve will push the melted aluminum alloy into the mold cavity. After the aluminum alloy is solidified, the moving platen will be open, then the aluminum pressure die casting is removed.

The mould is the best expensive in sand casting mould and permanent mould, so the die casting process is economical only for high production.

In 2000 year, we built our gravity die casting shop in our factory. There was only one gravity casting machine that time. Now we have four lines for gravity casting and can make 3000kg aluminum gravity casting per day. Our production is including auto components, subway components, gas station components, pipeline components, Wheel, fuel injection housings, spline.

The Introduction : Gravity Die Casting

Gravity Die Casting is named permanent mold casting or chill casting. Permanent mold is called in America, Chill cast or gravity casting is named in Europe.

The process is suitable for less quantity and high quality aluminum castings,  the surface is better than sand casting. The material of permanent mold is steel, the mold is pre-heated up to 200%u2103 before the aluminum alloy is poured into the cavity.

The weight range from 30g to 100kg/pcs, all thickness of parts must meet above 3.5mm, the draft angles must meet 1º to 3º on outside surface, 2º to 5º on inside surface.

At present, the aluminum gravity die casting is very mature in China.

Aluminum Sand casting is traditional casting process in China, it is major inventions of ancient China, it is important as China's four great inventions. The sand cast process originated in the Southern and Northern Dynasties, about 1600 years ago.

Our aluminum foundry is set up in 1995 year. First, we only have green sand casting process, then We built resin sand casting line in 2000 year. Now we have five production lines for large aluminum green sand casting jobs up to 500kg/piece and 30 platforms for smaller aluminum alloy castings. Meanwhile, we have one production line for resin sand casting . We are leading in China foundries in Zhejiang province. There is green sand casting process for sand casting manufacturer, but we have two process.

We make molds in our foundry and we have a good ability in sand casting mold design, It is difficult for many China sand casting factories. So if you have decision to cooperate with us, we must be a good sand casting supplier for you and your company.

Our cast aluminum products are exported America, Europe and Asia market, including auto components, furniture components, lighting components, pump valve components, architectural components and so on.

The Introduction : Sand Castings

Sand casting is used to make large parts, suitable for Aluminum alloy, Iron, Steel and Brass metal. There are two techniques: green sand casting and resin sand casting. The sand cast molds are same for the two ways, their difference is only sand. Green sand is for green sand casting process, which is the most common used by foundries; resin sand is for resin sand casting process or making cores.
·The "green sand" consists of mixtures of sand, clay and moisture.
·The "resin sand" consists of sand and synthetic binders cured thermally or chemically
·The cores used for forming the inside shape of hollow parts of the casting are

 As usually, the material of sand casting moulds is wood, silica or aluminum alloy. If the aluminum part is small, the quantity is less and the structure of castings is easy, we make the casting parts by wood mold or silica mold, such as furniture components, architectural components; If the structure is complex, the aluminum product is very big, or the order will be continued several, we suggest to make the sand casting parts by aluminum alloy mold, such as engine blocks, cylinder heads, housing.

The sand mould is re-usable and permanent patterns, there are some pouring cups and risers on the moulds. How to set up the pouring cup and riser is the key in moulds design