Valve body on horizontal borer

This 5,500kg 72inch butterfly valve body in 316 stainless steel is being finish machined on a horizontal boring machining centre at Goodwins machine shop.

Goodwin have three of these Toshiba BTD13F machines, which are CNC controlled with Tosnuc control, tool changer, extending quill and full C axis. X-axis 3m; Y-axis 2.2m; Z-axis 1.5m.

There are also four Toshiba BTD12 horizontal borers with a 2m X-axis.

Valve held in a machining jig on a vertical borer

20inch re-heat valve held in a machining jig on a Toshiba TSS-30-55B vertical boring machine

As are most of Goodwin machines the vertical borer is CMM controlled with tool changer and live spindle. It has a maximum turn diameter of 6,000mm (236 inches) and turn height of 2,590mm (102 inches).  

There are six large vertical boring machining centres available at Goodwin.

Filter basket for a power generation steam valve

A CrMo forging is machined with 13,869 holes - this forms the filter basket for the intercept valves. Machining is carried out on a TOSHIBA NX76 CNC controlled horizontal machining centre.

The machining centre has fully automatic tool change with 60 tool capacity. Tool monitoring senses any change in the characteristics of the operation and automatically changes the tool when necessary.

The filter basket has 13,869 holes of 7.25mm diameter which are 11mm counter sunk - the drilling and countersinking is carried out in one operation.

The whole machining operation is completed in less than 18 hours - this is a rate of over 12 holes per minute.

Super Nickel Alloy 625 Steam Gland

Nickel alloys require careful control and very ridged machines when finish machining.

This steam gland is manufactured in a NiCrMoNb alloy 625 and is supplied in the finish machined and assembled condition.
This is part of the 'next generation' nickel-based super alloy castings for advanced pulverised coal-fired power plants. These plants operate with a live steam temperature of 700°C; the efficiency is then increased from 47% to 55%, resulting in a reduced fuel consumption and CO2 emission of almost 15%.

Machining of large crankshafts

Vertical boring machining of large alloy steel crankshafts. The 4,500kg crankshafts are used for oil exploration mud pumps.

The machining centre is a Toshiba TXN-16 CNC vertical borer with 1.6m chuck and 2m turn diameter, with a maximum turning height of 1.0m.
Equipped with live spindle tooling for milling, drilling and tapping (both vertically and horizontally).

600MW RSV-IV after finish machining

This reheat stop and intercept valve consists of two IV castings welded to a RSV casting.

After fabrication welding and finish machined the unit is then assembled as supplied as a fully working steam valve.

Machining CDC inner barrels

Toshiba TMD-16 CNC vertical borer with live spindle tooling for milling, drilling and tapping in the vertical and horizontal plane. This machining centre is equipped with pallet changer and tool changer for high productivity.

Castings being machine are CDC inner barrels for gas turbines. 

Cast valve head (bonnet)

Dimensional inspection of a valve head (bonnet) for a 12inch steam valve.
These type of heads are typically supplied as forgings. Goodwin worked with the customer to enable them to be converted to castings. This supply route saved cost and delivery time over the forgings.

Cast heads have been supplied for valves from 7 to 30inch and up to 4,000kg in weight.