Affordable Machining Hardness Range For Iron And Steel Castings

by tudedude

Affordable Machining Hardness Variety For Iron And Steel Castings

As for machining process, the hardness is an crucial issue. Too higher hardness will harm the cutters, and even trigger the failure of machining. Even so, as for the cast iron and cast steel, what is the affordable hardness range?

According to my knowledge in the iron foundry in China, the following hardness range is suitable.

1. The reasonable hardness range to cast iron

Typically, the hardness of cast iron is indicated by BH (Brinell Hardness) or HB (Hardness of Brinell). The hardness significantly less than HB 220 will be appropriate for regular machining procedure. In other words, they are suitable for typical steel alloy cutters. Most of iron foundries could machine the iron castings in this hardness range.

We suggest you to manage the hardness under HB 210. Simply because HB 220 is still a small challenging for the drilling and tapping.

Nevertheless, by the special steel alloy cutters or ceramic cutters, the cast iron with hardness below HB 300 can be machined.

2. The reasonable hardness range to cast steel

Since the cast steel is a lot more brittle than cast iron, so it can be machined much more effortlessly.

The cast steel with hardness under HB 330 can be machined by the regular steel alloy cutters. If we transfer it into Rockwell Hardness, it is about RH 35. The cast steel with hardness under HB 500 (RH 50) can be machined by the specific steel alloy cutters.

In brief:

As for Cast Iron

Below BHN 220: Regular

BHN 220 to BHN 300: Specific

As for Cast Steel

Beneath BHN 330, HRC 35: Typical

BHN 330, HRC 35 to BHN 500, HRC 50: Unique

BHN signifies Brinell Hardness Number. HRC means Rockwell Hardness.

The metal casting designers and foundries need to think about the hardness range cautiously, and arrange the production and machining method accordingly.

As for the cast steel gears, we generally make the rough casting with regular hardness, then machine and hob it, then do the heat therapy to increase its surface hardness, and finally grind it to remove the surface oxide surface.

Higher hardness will lead to the much more severe brittleness, so the affordable hardness range and heat therapy method is extremely critical for the outstanding components.

This post was from Dandong Foundry. For the entire write-up, please check Dandong Foundry Weblog.

http://www.iron-foundry.com

http://www.iron-foundry.com/machining-hardness-range.html

CNC Machining of Castings & Components - Machined Castings UK

Impact driver - Precision Machining China Parts - Lost Wax Castings

by W.D. Vanlue

Impact driver – Precision Machining China Parts – Lost Wax Castings

Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (August 2009)

An impact driver is a tool that delivers a strong, sudden rotational and downward force. In conjunction with toughened screwdriver bits and socket sets, they are often used by mechanics to loosen larger screws (bolts) and nuts that are corrosively “frozen” or over-torqued. The direction can also be reversed for situations where screws have to be tightened with torque greater than what a screwdriver can reasonably provide.

A manual impact driver with screwdriver bits and adapters

Manual impact drivers consist of a heavy outer sleeve that surrounds an inner core that is splined to it. The spline is curved so that when the user strikes the outer sleeve with a hammer, its downward force works on the spline to produce turning force on the core and any socket or work bit attached to it. The tool translates the heavy rotational inertia of the sleeve to the lighter core to generate large amounts of torque. At the same time, the striking blow from the hammer forces the impact driver down into the screw reducing or eliminating cam out. This attribute is most beneficial for Philips screws which normally cam out as part of their design. It is less beneficial for flat head, also known as common, screws and is not beneficial at all for most other types.

Cordless motorized impact driver, battery, charger, and some bits

Another type of impact driver uses a motor to automatically deliver the downward and rotational forces. These have the advantage of greatly increased speed. They are most often used in construction and manufacturing China to replace screwdrivers where speed and operator fatigue are an issue. In some situations however, this type falls short since current designs cannot deliver the heavy downward blow of a manual unit. This can be especially true on very stubborn fasteners.

These are not to be confused with the impact wrench, which is a motorized tool (usually powered by compressed air), with a similar name and function. These also use a hammering action to apply torque to fasteners. The difference is that impact wrenches do not provide the positive engagement that impact drivers offer as mentioned above. This is desirable though on hex head fasteners and others where the downward seating action is unnecessary and potentially damaging. To add to the confusion, they look identical to motorized impact drivers.

Buyers must also be aware that some tools improperly advertised as impact drivers are actually just impact wrenches. The only way to verify that a motorized impact driver is truly what it claims to be (without taking it apart) is to try it before purchasing.

Categories: Mechanical hand toolsHidden categories: Articles lacking sources from August 2009 | All articles lacking sources

The e-commerce company in China offers quality products such as Precision Machining China Parts , Lost Wax Castings, and more. For more , please visit Precision Machining China Parts today!

Impact driver - Precision Machining China Parts - Lost Wax Castings

Premium Precision Castings Range

by Chris Devers

Premium Precision Castings Range

 

 

 

A wide range of precision castings are available in high grade material for moulding industry. These are especially used for bulk production and for fully mechanized moulding processes. All the industrial moulds are in huge demand worldwide.

Several companies, today, are manufacturing China large quantity of aluminium die casting,

Aluminium Die Castings, cast aluminum molds & gravity die casting. These are fabricated using BSS LM series alloys and more in sate of the art infrastructure. They adhere to stringent quality parameters to ensure internal soundness, higher mechanical properties and durability in the final product.

The entire range is offered at highly competitive rates for the domestic as well as global based clients. These precision castings have several utilities in railways, automobiles, plastic toys industry, air compressors industry, defence system and many more.

Quality Analysis

Quality assurance is the primary objective of the companies. Without this, one can cannot think of considerable market growth. As such, now these companies have modernized their facilities, implementing innovative and inventive techniques in them. They consistently upgrade their manufacturing China unit, R&D and quality auditor sections to deliver highly efficient, abrasion or termite, corrosion resistant and durable products. Premium grade alloys like aluminum, bronze etc are used to produce the best.

They design their precision castings – aluminium die casting, cast aluminum molds, aluminum sand castings & gravity die casting as per international quality standards. These casts and molds are checked at each level of the production to approve their overall efficiency and long lasting utility. Well defined parameters followed to keep a check on the total efficiency of the product include:

*Termite proof (wooden patterns)

Insect resistivity (wooden patterns)

Higher efficiency

Long Service Life (Durability)

Resistant to corrosion

Dimensional accuracy

Many have advanced their in house quality testing laboratory with experienced professionals for offering flawless and defect free range to the clients. These tests basically involve ultrasonic testing, radiography, hardness test, D.P.T. (die penetration test) and M.P.T. (magnetic particle test). While the other tests include ultrasonic test, industrial X-ray, chemistry of metals as well as elongation or tensile strength

Vast Product Range

Taking the advantage of skilled work force and modern manufacturing China facilities, excellent range of die castings & molds are developed. The pre determined industry norms followed while processing help deliver as defined by numerous industries and all OEMs such as power transmission industry, water & slurry pumps industry, machine tool industry, food processing machines manufacturer Chinas and many more.

This mass production of aluminium die casting, cast aluminum molds, aluminum sand castings and

Aluminium Gravity Die Castings

is done on bulk demand of the customers. They even offer customization facility to the customers so that they get as per their exact requirements. For this reason, they approach more and more with their respective demand without considering the price, which hardly cost much. These are available in a wide range in custom shape & sizes at the industry leading prices for various industrial applications. Such precision castings have really revolutionized industries related with cast and mold development all over the world.

 

 

 

 

 

 

 

The writer is known worldwide for his sensible writings. His works include engineering stuff. All articles written by him are informative and very inspiring. These have proven of immense help to various emerging businessmen.

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Premium Precision Castings Range

Castings With Machining China

by Li Song

Castings With Machining China
Where to buy the castings with machining China in China? There are many iron foundries in China, who can machine the castings in-house.


In the past, I heard many clients said they were surprised by the machining China capability for the metal foundries and machining China workshops in China. They thought China foundries just had some simple and poor casting equipments, but there were no high-precision machining China equipments, but they found there were many foundries in China equipped CNC centers, numerical control machines and CMM. They have the equipments to machine very small or very large metal castings with high machining China precision. I guess it is because China foundries have improved their machining China capability in the recent years.


However, where could you buy the metal castings with machining China? I suggest you to consider the following ways:


1. From the iron foundries who have the machining China capability in-house.


As I said, there are many metal foundries especially iron foundries in China, they have many machining China equipments, so you could ask them to produce the rough castings, and do the finish machining China, or rough machining China if they could not meet your high requirements.


In this way, you will find many advantages. If they find the defective castings during their machining China process, then they could replace them quickly and free of charge for the buyers. So, it will save you many time and costs. Moreover, it does not need your coordination between the foundries and machining China workshops. According to my experience, the coordination works will kill you.


2. From the machining China workshops who can buy the rough castings locally.


This is also a good way if your products need many machining China works, or need high-precision machining China. In this way, you just need to ask for the finish castings from the machining China workshops, and ask the machining China workshops to solve the any defective problems either from machining China or from rough castings. So, the machining China workshops will try their best to control the quality of quality and solve the defective castings with their subcontractors. It will also save your time and costs. The disadvantage of this way is the price. The price will be higher than the first way. Why? The machining China workshops have to add some extra costs in their quotations, such as the administrative costs, the defective costs, the profit from rough castings, the margin in case of increased prices of rough castings. As I know, in Dandong Foundry in China, we will quote the rough castings with very low profit, sometimes, even lower than 3%, and tried to get more profit from machining China to compensate our loss for rough castings. However, if you ask us to supply the rough castings to other machining China workshops, then we will have to quote with a normal profit since we can not get the profit from machining China.


3. From castings trading companies.


There are many trading companies in China and overseas, who could supply the metal castings to the final clients in USA, UK, and other countries. Usually, they could go to the foundries to inspect the dimensions and coordinate the defective issues between the clients, metal foundries and machining China workshops. I think they should also be a good choice for you if you could not find a suitable metal foundry or machining China workshop.


In order to buy the good castings with machining China, you do need to consider many aspects.




This article was from Dandong Foundry. Please keep this link!

http://www.iron-foundry.com/castings-with-machining.html

http://www.iron-foundry.com