US 12,440,904 B2
Expansion clamping device and method of making same
Thomas Retzbach, Bönningheim (DE)
Assigned to Klaus Raiser GmbH & Co. KG, Eberdingen (DE)
Appl. No. 17/780,685
Filed by Schunk GmbH & Co. KG Spann- und Greiftechnik, Lauffen am Neckar (DE)
PCT Filed Nov. 27, 2020, PCT No. PCT/EP2020/083747
§ 371(c)(1), (2) Date May 27, 2022,
PCT Pub. No. WO2021/105436, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 19212256 (EP), filed on Nov. 28, 2019.
Prior Publication US 2023/0356304 A1, Nov. 9, 2023
Int. Cl. B23B 31/30 (2006.01); B23K 20/12 (2006.01); B23K 20/227 (2006.01); B23K 101/20 (2006.01); B23K 103/04 (2006.01); B23P 15/00 (2006.01)
CPC B23B 31/305 (2013.01) [B23B 2240/16 (2013.01); B23K 20/129 (2013.01); B23K 20/227 (2013.01); B23K 2101/20 (2018.08); B23K 2103/04 (2018.08); B23P 15/00 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An expansion clamping device, comprising:
a base body (2) defining a longitudinal axis; and
a sleeve (5) inserted into or surrounding the base body (2) and forming at least one pressure chamber (8), wherein the at least one pressure chamber (8) can be pressurized by a hydraulic medium in order to achieve a clamping effect, wherein the sleeve (5) is fixed to the base body (2) by a friction weld joint (14) at a front axial end region (16) of the at least one pressure chamber (8) and/or at a rear axial end region (17) of the at least one pressure chamber (8), and wherein the at least one pressure chamber (8) receives in the front and/or rear axial end region (16, 17) adjacent to the friction weld joint (14) a welding bead (15) produced during the creation of the friction weld joint (14) and is widened relative to a region (18) of the at least one pressure chamber (8) which is central in an axial direction.