Patent EP-2450155-A1 (EP)
Inventor: EHRL JANNE
IPC: B23P9/04
Filed: 2010-11-03
Abstract: The needle peening device comprises: a support (2,400) including needle channels in which needles (7.1) are displaceably guided in a needle direction and delimits a counter piston chamber, which is increased in size by a movement of the needle in the needle direction, and an opposite piston chamber, which is reduced in size by the movement of the needles in the needle direction; a pressure reservoir (402); and a passage (403, 404) that is fluidically connects the piston chamber and the pressure reservoir to one another. The needle peening device comprises: a support (2,400) including needle channels in which needles (7.1) are displaceably guided in a needle direction and delimit a counter piston chamber, which is increased in size by a movement of the needle in the needle direction, and an opposite piston chamber, which is reduced in size by the movement of the needles in the needle direction; a pressure reservoir (402); a passage (403, 404) that is fluidically connects the piston chamber and the pressure reservoir to one another; a control-valve device (405, 407) for blocking the passage; a reset device for resetting the needles against the needle direction; a handheld device for mounting a housing on the surface to be machined; a checking unit for testing the component surface; a rolling or sliding bearing of the housing for arranging on a component to be machined; and a component-contact surface for placing on the component to be machined. The control-valve device is mechanically switchable by the movement of the needles in the needle direction, and comprises a slide valve. The needles are: movable by an acceleration device and/or a reset device against the needle direction; decoupled from the acceleration device; detachably and/or flexibly connected with the acceleration device and the housing; a movable part of the slide valve; arranged in a predetermined spiral matrix and guided through the support; and mounted individually or jointly in the slide bearing on the support. The needles have an integrally formed needle tips. The piston chamber is: connected by the control-valve device with an environment or a vacuum reservoir; formed as an annulus surrounding the needles; and fluidically arranged between the pressure reservoir and the control-valve device. The passage comprises a bore in the needles. A standing detection device for detecting whether the needle peening device is superimposed on a surface and blocking the passage when the needle peening device is not superimposed on the surface. A hit detection device for detecting whether the needle strikes on the surface. A control device is designed for controlling the movement of the needle in the needle direction for adjusting a predetermined pressure in the pressure reservoir. A rotating device is designed for rotating the support opposite to the housing of the needle peening device for displacing the needles at point of impact on the surface, and comprises a single- or multi-stage transmission such as a gear transmission. A guiding body: has the needle channel that communicates with a fluid reservoir, and a movable adjusting agent, which limits the fluid reservoir; and is rotatably guided by a motor on the housing. The needle direction: has the component that is parallely aligned to a rotational axis of the support opposite to the housing; and is radially aligned with the rotational axis of the support relative to the housing. The support comprises a rotatable base part opposite to the housing and a rotatable rotary part opposite to the base part, where the rotary part is eccentrically mounted on the base part. The adjusting agent comprises a piston that is displaceably guided on the guiding body and a flexible membrane. An actuator: is designed for acting on the adjusting agent that is mechanically, hydraulically, pneumatically and/or electromagnetically accelerated; comprises a hammer that is mechanically, hydraulically, pneumatically, electromagnetically accelerated by an ultrasound; and is formed for an impulsive acceleration. The fluid reservoir contains a liquid such as a hydraulic liquid. The needles and/or the support are electromagnetically, pneumatically, hydraulically and/or mechanically movable by an electric motor. The movement of the needle is magnetically, pneumatically, hydraulically and/or mechanically coupled relative to the support and a rotation of the support relative to the housing, or the movement of the needle relative to the support and the rotation of the support relative to the housing is independent. The needle peening device further comprises two needles that are movably decoupled. The needle point of impact lies on a straight path with a predetermined distance from one another on the surface. An outer contour of a part of the needle peening device is made of plastic. An independent claim is included for a process for locally working surfaces of components.