The invention is directed to a friction stir welding device which can realize appropriate friction stir welding while preventing a welding tool from being worn out and damaged. Therefore, the friction stir welding device is provided with a welding tool which rotates while abutting on a member to be welded to cause a plastic flow phenomenon in the member to be welded, a tool holder which grasps the welding tool and rotates together with the welding tool, supply paths which are formed in the tool holder and supply a refrigerant to the welding tool.

The invention is directed to a friction stir welding device which can realize appropriate friction stir welding while preventing a welding tool from being worn out and damaged. Therefore, the friction stir welding device is provided with a welding tool which rotates while abutting on a member to be welded to cause a plastic flow phenomenon in the member to be welded, a tool holder which grasps the welding tool and rotates together with the welding tool, supply paths which are formed in the tool holder and supply a refrigerant to the welding tool.

A machining thermostatic control system and method of using the same are disclosed. The system comprises a detecting unit, a processing unit and at least a cooling unit. The detecting unit is used for detecting the temperature distribution of a workpiece. The processing unit is coupled to the detecting unit and is used for processing the temperature distribution for obtaining a position of maximum hot spot of the workpiece. The cooling unit comprises a head which is provided for discharging cooling fluid and a plurality of blades which are angle-adjustably mounted to the head. The blades are coupled to the processing unit and the angle of blades are controlled by the processing unit for enabling the cooling fluid to flow toward to the position of maximum hot spot position.

A constant temperature water supply apparatus includes a temperature adjustment unit that circulates cooling water and adjusts the temperature of a spindle unit of a processing apparatus and a processing water temperature adjustment unit. The temperature adjustment unit includes a pump that sends the cooling water to the spindle unit, a cooling water cooling unit, a first pipe that connects the pump and the cooling unit, a second pipe that connects the cooling unit and the spindle unit, and a third pipe that connects the spindle unit and the pump. The processing water temperature adjustment unit includes a processing water pipe that has one end connected to a water source and supplies processing water from the other end side to a processing tool and a heat exchange unit on the processing water pipe.

A chain saw (1) (an electric machine tool) comprises a body (10), to which a cutter (a work tool) (20) is attached, a motor (30), and a battery (50). The body (10) has a motor receiving chamber (15), a battery receiving chamber (16) opening through an outer surface of the body (10), and a communication path (17), through which the battery receiving chamber (16) is in communication with the motor receiving chamber (15). A first air inlet opening (81) is formed between the inner edge of an opening of the battery receiving chamber (16) and the outer periphery of the battery (50) disposed in the battery receiving chamber (16). Further, an inflow port (17a) of the communication path (17) opens to an inner side surface of the battery receiving chamber (16) and an air filter (70) is fitted over the inflow port (17a).

A chain saw (1) (an electric machine tool) comprises a body (10), to which a cutter (a work tool) (20) is attached, a motor (30), and a battery (50). The body (10) has a motor receiving chamber (15), a battery receiving chamber (16) opening through an outer surface of the body (10), and a communication path (17), through which the battery receiving chamber (16) is in communication with the motor receiving chamber (15). A first air inlet opening (81) is formed between the inner edge of an opening of the battery receiving chamber (16) and the outer periphery of the battery (50) disposed in the battery receiving chamber (16). Further, an inflow port (17a) of the communication path (17) opens to an inner side surface of the battery receiving chamber (16) and an air filter (70) is fitted over the inflow port (17a).

A water temperature setting method for a processing apparatus for processing a workpiece held by a holding table by rotating at a high speed a spindle with a processing tool mounted thereto and supplying processing water to the processing tool. A set temperature for the processing water supplied to the processing tool is set to be higher than a set temperature for spindle cooling water supplied to a spindle unit that rotates the spindle at the high speed, in consideration of a lowering in temperature due to evaporation of the processing water scattered from the processing tool due to the high-speed rotation of the processing tool.

A numerical-control machine tool is provided and includes a load-bearing beam which extends horizontally, has two axial ends resting in sliding manner on two lateral shoulders that rise from a basement and extend horizontally side by side so as to define a longitudinal corridor orthogonal to the longitudinal axis of the beam; a spindle-holding carriage which is movable on the load-bearing beam parallel to the longitudinal axis of the beam; a spindle-holding shaft which is fixed to the spindle-holding carriage in a vertical position, and is movable on the spindle-holding carriage parallel to its longitudinal axis; a front wall and a rear wall that close the two ends of the longitudinal corridor; an upper cover which closes the longitudinal corridor at the top; and an ambient conditioning unit which is adapted to bring and maintain the temperature of the air present inside the machining chamber around a given target value.

A fluid temperature control assembly in combination with a machine tool, and a method of adjusting the temperature of a fluid being supplied to a machine tool. The assembly is arranged to adjust the temperature of a fluid being supplied to the machine tool to maintain the fluid at a setpoint temperature at a location downstream of the assembly. The assembly comprises a radio frequency (RF) or microwave energy source to supply energy to the fluid as it passes through the assembly to heat the fluid, a temperature sensing arrangement for outputting a temperature signal responsive to the temperature of the fluid at the downstream location, and a control arrangement configured to receive the temperature signal and control the energy source with reference to the temperature signal to heat the fluid so as to maintain the fluid at the setpoint temperature at the downstream location.

A temperature control system for a machine tool is equipped with a first temperature control device configured to control the temperature of gas supplied to a gas bearing, a second temperature control device configured to control the temperature of a room interior and to issue a notification of its own operation state to the outside, a gas supply section configured to supply gas whose temperature has been controlled by the first temperature control device, and a gas supply control section configured to perform the gas supply control of the gas supply section so that gas is distributed to both of the gas bearing and an interior space, when receiving the notification that the operation state of the second temperature control device is abnormal.