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Dongguan Goodjob Precision Components Co.,Ltd.

ADD: No.68, Changsheng North Road, Dalang,Dongguan,Guangdong,China

Tel: +86-769-23327726

Fax: +86-769-23327736


1. Q: What surface treatments can you provide?

A:We can do different type of material surface treatment: a. Stainless steel: electropolishing, chemical polishing and Chromium passivation. b. Aluminum alloy: Sandblasting, anodizing, Tri-Chromium passivation, painting. c. Carbon and alloy steel: nigrescence, zinc, chromium, nickel plating, electroless nickel, phosphating. 

2.Q: What is CNC machining process?

A: CNC Machining is a process used in the manufacturing sector that involves the use of computers to control machine tools. Tools that can be controlled in this manner include lathes, mills, routers and grinders. The CNC in CNC Machining stands for Computer Numerical Control. On the surface, it may look like a normal PC controls the machines, but the computer's unique software and control console are what really sets the system apart for use in CNC machining. Under CNC Machining, machine tools function through numerical control. A computer program is customized for an object and the machines are programmed with CNC machining language (called G-code) that essentially controls all features like feed rate, coordination, location and speeds. With CNC machining, the computer can control exact positioning and velocity. CNC machining is used in manufacturing both metal and plastic parts.

3. Q: What is die casting?

A: Die casting is a metal casting process that is characterized by forcing molten metal under high pressure into a mold cavity. The mold cavity is created using two hardened tool steel dies which have been machined into shape and work similarly to an injection mold during the process. Most die castings are made from non-ferrous metals, specifically zinc, copper, aluminium, magnesium, lead, pewter and tin-based alloys. Depending on the type of metal being cast, a hot- or cold-chamber machine is used.

4. Q: What is called forged process?

A: Forging is a manufacturing process involving the shaping of metal  using localized compressive forces.The blows are delivered with a hammer (often a power hammer) or a die. Forging is often classified according to the temperature at which it is performed: cold forging (a type of cold working), warm forging, or hot forging (a type of hot working). For the latter two, the metal is heated, usually in a forge. Forged parts can range in weight from less than a kilogram to hundreds of metric tons.


5.Q: What is difference between forging and casting?

A: Casting is the process where metal is heated until molten. While in the molten or liquid state it is poured into a mold or vessel to create a desired shape. Forging is the application of thermal and mechanical energy to steel billets or ingots to cause the material to change shape while in a solid state.

6. Q: What materials are used for forged parts?

A: Aluminum, Copper alloys(Brass), Steel, Stainless steel, Titanium.

7. Q: What is copper forging?

A: As with any forged metal, once heated and formed the material has superior density, directional strength, and unparalleled durability. Brass and copper forged components also presents unique opportunities in addition the typical benefits of die forging. The properties of brass/copper are:Non-magnetic; High corrosive resistance; Superior machinability; electrical and thermal conductivity; High ductility; Exceptional plating characteristics. These properties lend themselves to applications where corrosion, electric magnetism, and extreme heat could compromise the component. Copper components have been used for decades for valves, flanges, pumps, and compressors were caustic chemicals would normally tarnish other metals.


8.Q: What is steel forging?

A: Steel forging is commonly used in mechanical and industrial applications due to its strength, availability, and specialized alloys like stainless and carbon steel.  Forgings in steel offer unsurpassed resilience for manufacturing parts that simply must not fail.


9.Q: What benefits of custom steel forging?

A: The benefits of Steel forging are:

(1) Custom steel forged parts offer a high degree of reliability and tolerance capabilities.

(2) Custom steel forgings offer uniformity of composition and structure. With many metal forgings made from one “heat” of steel, steel forgings have minimum variation in machinability and mechanical properties.

(3) Custom forged steel parts are stronger and more reliable than machined or cast parts due to the fact that the grain flow of the steel is altered, conforming to the part's shape.. 

(4)Custom steel forged parts make possible designs that accommodate high loads and stresses. Forgings are free from internal gas pockets, voids, or cooling defects that can cause unexpected fatigue or impact load failure. Custom Steel forgings are used when quality cannot be questioned. 

(5) Steel forging is the application of thermal and mechanical energy to steel bars, billets, and ingots to cause the material to change shape while in the solid state. This is a different process than casting, where metal is melted and poured into a mold in the liquid or molten state.


10. Q: What is aluminum forging?

A: Aluminium forging is performed at a temperature range between 350–550 °C.

Forging temperatures above 550 °C are too close to the solidus temperature of the alloys and lead in conjunction with varying effective strains to unfavorable workpiece surfaces and potentially to a partial melting as well as fold formation.

Forging temperatures below 350 °C reduce formability by increasing the yield stress, which can lead to unfilled dies, cracking at the workpiece surface and increased die forces

Due to the narrow temperature range and high thermal conductivity, aluminium forging can only be realized in a particular process window. To provide good forming conditions a homogeneous temperature distribution in the entire workpiece is necessary. Therefore, the control of the tool temperature has a major influence to the process. For example, by optimizing the preform geometries the local effective strains can be influenced to reduce local overheating for a more homogeneous temperature distribution.


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