Stock removal

Stock removal

High stock removal is a technological process with the goal to remove large / substantial amounts of material. The quantity of material, which can be removed in a specific process, depends on the material properties and the machining tool used.


The stock removal rate or the possible removal of material in a specific time period is depending on material properties. This is expressed by the machinability of a material: the ease or difficulty to machine a particular material. The machinability of materials varies greatly, for instance, aluminium and magnesium have a high machinability ratio compared to titanium and other special metals.

pecific energy

One way of qualifying the machinability is the specific energy (e). This is the amount of energy required to cut a volume of work material (kWh/mm3). Specific energy is depending on material properties. This makes that stock removal is related to specific energy.

New materials

There is a continuously development of new materials to fulfil the extreme demands of market segments like, Petrochemical, Power/Energy and Aerospace. Metallurgical changes have improved a large range of these materials (titanium, nickel). But by making the materials harder tougher, less heat sensitive and/or more resistant to corrosion and fatigue, this also make these new developed materials hard to machine.

Temperature rising

The specific cutting energy needed for ‘difficult to machine’ materials are extremely high. Especially in the high stock removal applications there are problems with the temperature rising of the work material surface. An increase of the work material temperature leads to deterioration of the work material surface integrity. Resulting in metallurgical damages like micro cracks, residual stresses and work hardening.

High stock removal machine tools

Not only the material properties determine the energy required to cut a volume of material (specific energy). The needed energy also depends on the technological process used to process the work material.


A lot of technologies are capable of removing substantial amounts of material. Among them are: sawing, turning, broaching, milling and grinding. Turning and milling are conventionally the most popular machining technologies. Turning is mainly used for round products, milling has a broad range of applications. Conventional methods like milling do have problems to keep up with the developments of the ‘difficult to machine’ materials. These methods generate locally too much heat. The special materials in particular require a cool cutting process.


Traditionally bonded abrasives are used for stock removal. To grind large products, with a substantial material removal, vertical segment grinders are used. These grinding machines work with a rotating disc with abrasive segments. The work material is pressed against those segments with the aid of a rotating or reciprocating table. These technologies are using significantly greater horsepower (up to 450 Hp!) than other grinding methods. Some major manufactures of these machines are Blanchard, Mattison, Göckel and Reform.

Belt grinding

tools. The productivity of the abrasive belt grinding technology is in most cases three times that of the rotary or reciprocating vertical grinders. As a result of this belt grinding is replacing the conventional technologies in the field of the speciality metals. As an example the world biggest titanium manufactures are using the belt grinding techniques. [ Site of wide belt manufacturer]

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Removal — may refer to:* Removal (band) * Removal jurisdiction in the United States courtsRemoval may also indirectly refer to: * Administrative Removal under Immigration Law * Amputation, removal of a body extremity by trauma or surgery * Deforestation… …   Wikipedia

  • Indian removal — The term Indian in this article refers to Native Americans; not to be confused with South Asians from the Indian subcontinent Routes of southern removals. Indian removal was a nineteenth century policy of the government of the United States to… …   Wikipedia

  • Union Stock Yards — For the facilities in South Omaha, see Union Stockyards (Omaha). Union Stock Yards, 1947 The Union Stock Yard Transit Co., or The Yards, was the meat packing district in Chicago for over a century starting in 1865. The district was operated by a… …   Wikipedia

  • Tehran Stock Exchange — Infobox Exchange name = Tehran Stock Exchange nativename = بورس اوراق بهادار تهران type = Stock Exchange city = Tehran country = Iran coor = foundation = 1968 owner = key people = currency = commodity = listings = mc volume = indexes = homepage …   Wikipedia

  • Alfred Stock — Infobox Scientist name = Alfred Stock birth date = birth date|1876|7|16|df=yes birth place = Danzig, German Empire death date = death date and age|1946|8|12|1876|7|16|df=yes death place = Aken an der Elbe, Germany nationality = German field =… …   Wikipedia

  • Nottingham Arabidopsis Stock Centre — Website The Nottingham Arabidopsis Stock Centre (NASC) provides seed and information resources to the International Arabidopsis Genome Project and the wider research community. It is based in the School of Biosciences… …   Wikipedia

  • London stock brick — is the most commonly used type of building brick in London. Its distinctive yellow colour and soft appearance comes from the yellow Kent clay from which the bricks are made.Air pollution in London during the 19th century and early 20th century… …   Wikipedia

  • bright stock — noun : any of various clear oils (as a heavy lubricating oil) obtained usually from residues of petroleum distillation by refining (as by removal of wax) …   Useful english dictionary

  • Belt grinding — is a machining method to process metals and other materials, with the aid of coated abrasives. The basic difference between belt grinders and belt sanders is the material being machined. Sanding is the machining of wood, grinding is the common… …   Wikipedia

  • Knife — A knife is a handheld sharp edged instrument consisting of handle attached to a blade used for cutting. The knife is a tool that can be used as a weapon. Its origins date as far back as two and a half million years ago, as evidenced by the… …   Wikipedia

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.