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CN-224223289-U - Tool clamp

CN224223289UCN 224223289 UCN224223289 UCN 224223289UCN-224223289-U

Abstract

The application relates to a tool clamp, in particular for machining impeller-like parts, comprising a main support (110) and a mating member (120), the main support (110) comprising a central bore for insertion into a workpiece and being connected to a mating member spindle (30), the mating member (120) being pressed against a central hub (12) of the workpiece (10) defining the central bore when connected to the spindle (30) to secure it between the mating member (120) and the spindle (30), the tool clamp further comprising an auxiliary support (130) comprising a support body (140) configured for being slipped over the spindle (30) and a plurality of ejector pins (150) extending from the support body (140) and configured for abutting against an outer ring portion (18) of the workpiece (10), the plurality of ejector pins (150) being arranged radially around the spindle (30).

Inventors

  • DING SHUANG

Assignees

  • 罗伯特·博世有限公司

Dates

Publication Date
20260512
Application Date
20250424

Claims (12)

  1. 1. Tool clamp comprising a main support (110) and a mating member (120), the main support (110) comprising a spindle (30) having a central axis extending in an axial direction, the spindle being configured for insertion into a central bore of a workpiece and connecting the mating member, the mating member (120) being configured to press against a central hub (12) of the workpiece (10) defining the central bore when connected to the spindle (30) to secure the central hub between the mating member (120) and the spindle (30), The tool clamp further comprises an auxiliary support (130) comprising a bracket body (140) configured to fit over the mandrel (30) and a plurality of posts (150) extending from the bracket body (140) and configured to abut against an outer ring portion (18) supporting the workpiece (10), the plurality of posts (150) being arranged radially around the mandrel (30).
  2. 2. The tool clamp according to claim 1, wherein the bracket body (140) includes a base (142) for positioning to a mandrel (30) and a curved portion (144) for supporting the plurality of posts (150), the curved portion having a contour corresponding to and conforming to the outer ring portion (18) of a workpiece (10).
  3. 3. The tool clamp according to claim 2, wherein the main support (110) includes a flange (35) connected to the spindle (30) and having an increased outer profile, the base (142) including a locating surface for abutting the flange (35).
  4. 4. A tool clamp according to claim 3, characterized in that the bracket body (140) comprises opposite first (141) and second (143) surfaces, the locating surface being a surface portion (147) of the first surface (141) recessed at the base (142), the second surface (143) comprising a surface portion corresponding to and conforming to the outer ring portion (18) of the workpiece (10).
  5. 5. Tool clamp according to claim 4, characterized in that the bracket body (140) is a one-piece and/or that the bracket body (140) has a bowl-shaped contour.
  6. 6. The tool clamp according to any one of claims 1-5, wherein at least some of the plurality of posts (150) extend from the bracket body (140) by an adjustable dimension.
  7. 7. The tool clamp according to claim 6, wherein each of the plurality of posts (150) is disposed within a through hole (155) formed on the bracket body (140) and includes a head end (151) that is extendable from the through hole (155) to abut the workpiece (10).
  8. 8. The tool clamp according to claim 7, wherein, Each of the plurality of pins (150) is movably disposed within a respective through hole (155) and has a trailing end (153) received within the through hole (155) with an actuation hole (157) for engaging a tool such that the respective pin can be moved by the tool, or Each of the plurality of posts (150) includes a first member secured within a through hole (155), a second member including the head end (151), and a third member associated with the first and second members and actuatable to move the second member relative to the first member.
  9. 9. The tool clamp according to claim 6, wherein the plurality of posts (150) comprises a plurality of first posts radially disposed about the mandrel (30) and/or a plurality of second posts radially disposed about the mandrel (30), wherein each first post extends from the support body in an axial direction and each second post extends from the support body obliquely with respect to the axial direction.
  10. 10. The tool clamp of claim 9, wherein each of the second posts extends from the bracket body at an inclination angle of 30 degrees to 50 degrees with respect to the axial direction.
  11. 11. The tool clamp according to claim 9, wherein the plurality of posts (150) further comprises a plurality of third posts radially disposed about the mandrel (30), wherein each third post protrudes from the support body in a radial direction.
  12. 12. Tool clamp according to any one of claims 1-5 and 7-11, characterized in that the mandrel (30) comprises a first section (32) with an external thread for connecting with an internal thread of the fitting (120), a second section (34) for adapting to a central hole of the workpiece, and a third section (36) for adapting to an auxiliary hole (145) of the bracket body (140), the second section (34) and the third section (36) defining a first shoulder (33) for positioning a workpiece (10).

Description

Tool clamp Technical Field The application relates to the field of machine tool clamping fixtures, in particular to a fixture, which is particularly suitable for machining impeller-shaped parts. Background An impeller, such as an impeller used in a hydrogen circulation pump of a fuel cell, includes a central hub having a central bore, and an outer ring portion having flow passages or vanes (adjacent flow passages being separated by vanes) disposed radially about the central hub, and an intermediate ring portion connecting the central hub and the outer ring portion may have a significantly reduced dimension in an axial direction. In machining the flow passages of the impeller with a machine tool, a workpiece for machining the impeller is first clamped and fixed to the machine tool, and then the flow passages are machined on the outer ring portion of the workpiece with a machine tool cutter. Currently used tool clamps clamp onto the outer ring portion of the workpiece, applying a radially inward clamping force to the outer ring portion. However, as some of the flow channels are machined, the material remaining on the outer ring portion gradually decreases, particularly with very little material (or very little wall thickness) remaining on the base wall at the location where the flow channels are machined (see base wall 25 at flow channel 14 of FIG. 2). At this time, the huge holding force (and the huge cutting force of the tool of the machine tool) applied by the tool fixture causes complex and large-magnitude deformation of the weak parts, and unacceptable deviation or error of the shape and the size of the finally processed impeller part is caused, so that a bad or unqualified workpiece is formed. Disclosure of utility model The application aims to provide a novel tool clamp. The application provides a tool clamp comprising a main support and a mating member, the main support comprising a spindle having a central axis extending in an axial direction, the spindle being configured for insertion into a central bore of a workpiece and for connection to the mating member, the mating member being configured to press against a central hub of the workpiece defining the central bore when connected to the spindle to secure the central hub between the mating member and the spindle, the tool clamp further comprising an auxiliary support comprising a bracket body configured for fitting over the spindle and a plurality of posts extending from the bracket body and configured for abutment support against an outer ring portion of the workpiece, the plurality of posts being arranged radially around the spindle. In one embodiment, the bracket body includes a base for positioning to a mandrel and a curved portion for supporting the plurality of posts, the curved portion having a profile that corresponds to and conforms to the outer ring portion of a workpiece. In one embodiment, the main support comprises a flange connected to the spindle and having an increased external profile, and the base comprises a locating surface for abutting the flange. In one embodiment, the bracket body includes opposing first and second surfaces, the locating surface being a surface portion of the first surface recessed at the base, the second surface including a surface portion corresponding to and conforming to the outer ring portion of the workpiece. In one embodiment, the stand body is a one-piece and/or the stand body has a bowl-like profile. In one embodiment, at least some of the plurality of posts are adjustable in size extending from the bracket body. In one embodiment, each of the plurality of posts is disposed within a through hole formed in the bracket body and includes a head end that is extendable from the through hole to abut a workpiece. In one embodiment, each of the plurality of posts is movably disposed within a respective through bore and has a trailing end received within the through bore, the trailing end having an actuation aperture for engaging a tool to enable movement of the respective post by the tool, or Each of the plurality of posts includes a first member secured within the through bore, a second member including the head end, and a third member associated with the first and second members and actuatable to move the second member relative to the first member. In one embodiment, the plurality of posts comprises a plurality of first posts radially disposed about the mandrel and/or a plurality of second posts radially disposed about the mandrel, wherein each first post extends from the stent body in an axial direction and each second post extends from the stent body obliquely with respect to the axial direction. In one embodiment, each of the second struts extends from the bracket body at an inclination angle of 30 degrees to 50 degrees with respect to the axial direction. In one embodiment, the plurality of struts further comprises a plurality of third struts radially disposed about the mandrel, wherein each third strut