Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
  • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
  • B24B3/247—Supports for drills
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
  • B24B3/24—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of drills
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B41/00—Component parts such as frames, beds, carriages, headstocks
  • B24B41/06—Work supports, e.g. adjustable steadies
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
  • B24B41/00—Component parts such as frames, beds, carriages, headstocks
  • B24B41/06—Work supports, e.g. adjustable steadies
  • B24B41/066—Work supports, e.g. adjustable steadies adapted for supporting work in the form of tools, e.g. drills
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K3/00—Apparatus or processes for manufacturing printed circuits
  • H05K3/0011—Working of insulating substrates or insulating layers
  • H05K3/0044—Mechanical working of the substrate, e.g. drilling or punching
  • H05K3/0047—Drilling of holes

Definitions

• Pliers for holding a workpiece in a grinding machine are provided.
• the present invention relates to a clamp for holding a workpiece in a grinding machine.
• the grinding machine is equipped with a holding clamp ensuring secure support of the workpiece, in particular of the cylindrical end portion of the drill during at least part of the operations.
• Retaining clamps comprising, in one piece, a central zone of attachment to a support and two parallel branches connected to the central zone by several narrow arms which are elastically deformable. At one of their ends, the branches are provided with spouts adapted to the type of parts to be supported while a pressure mechanism acts on their other end to cause the clamping of the spouts.
• the clamp In the state of rest, the clamp is in the open position and its closing, for engagement of the part, requires the action of a guided pusher acting between the ends of the arms of the clamp opposite to those carrying the spouts.
• the spouts When the spouts are closed, the part, the pliers arms and the pusher constitute a hyperstatic system. It follows that, if the closing movement is not strictly isometric (for example if the pusher does not press equally on the two branches of the clamp, in particular due to wear or play), this movement causes a displacement of the part which constitutes the weak element of the system.
• the present invention relates to a gripper for holding a workpiece on a grinding machine, in particular for drilling drills with end portion having a large length to diameter ratio, comprising a gripper body in one piece with two parallel branches having a rear end and a front end, with a central zone for fixing the clamp on a support, and elastically flexible arms cut out from the body so as to ensure the connection between the central zone and the branches by forming a pivoting device , so that a control member acting on the rear ends of the branches causes the front ends to be moved apart or brought together by pivoting the branches in the pivoting device, characterized in that the pivoting device is arranged so that the control member being in a rest position, the front ends of the branches are brought together es and the clamp is in the closed position, while in moving towards an active position, this control member deforms the pivoting device and the front ends of the branches are spaced apart.
• the opening of the clamp can be obtained by displacement of a control member in translation along the rear ends of the branches, two diverging ramps on the branches of the clamp transforming the longitudinal movement into a transverse movement causing the branches to pivot.
• at least one of the tips of the spouts has a groove having a vee shape so as to constitute two points of contact with the workpiece, which makes it possible to maintain the workpiece to be ground. '' in a statically determined manner, without risk of modification of the conditions of taking.
• the pivoting device is preferably produced by a cut in the blank of the body of the clamp by forming four elastic arms connecting two by two the central area to each of the branches which determines two parallel, fictitious axes of rotation, ensuring operation high precision.
• - fig. 1 is a top plan view showing the one-piece body of the clamp
• FIG. 6 is a top plan view showing the pliers complete with its control member.
• the clamp body 1 shown in FIG. 1 is a steel part having the desired metallurgical properties so that its various parts, obtained after cutting, fulfill the required functions. These different parts include a central zone 2, two parallel branches of symmetrical shapes 3 and 4, and a pivoting device 5 forming two fictitious pivot axes a and b (corresponding to the respective intersections of the axes of the arms 12 and 15 and of the arms 13 and 14 described below), which we see that they are located on the same line perpendicular to the general longitudinal axis of the clamp, on either side of this axis.
• the central zone 2 is rectangular in shape with a central hole 6 tapped for fixing the body 1 on a fixed support, and with four holes 7 adjusted and intended to receive positioning pins on the support. It is delimited with respect to the branches 3 and 4 by a narrow cutout 8 which surrounds it on its four sides except in the center of the side facing the front end of the branches.
• a slightly trapezoidal space 16 separates the rear ends of the branches 3 and 4 which each still have a ramp 27 and 28 intended to cooperate with a control member 26 (fig. 6) of the openings and closings of the clamp, as will be seen more far. Stops 32, 33 for limiting the opening stroke of the clamp are also provided near the rear ends of the branches 3 and 4.
• FIG. 5 the rim 20 of FIG. 2 on a considerably enlarged scale.
• the two sides 23 and 24 of the groove 22 are planar and, in this example, perpendicular to one another.
• the end of an oblique edge between the bevelled face and the upper flat face of the spout 17 terminates in the center of the flank 23.
• the cylindrical surface of a drill 25 is engaged in the groove 22 so as to press along four generatrices against the sides 23 and 24 of the tips of the two nozzles 17.
• only one of the tips 20 of the clamping spouts 17 has a groove 22 with a vee profile, the tip 20 of the other spout may not have a groove.
• one or both grooves with a vee profile can be replaced by grooves in the shape of a half-moon or any other suitable shape.
• the two nozzles 17 of the clamp are fixed on the front parts of the branches 3 and 4 in positions which are exactly determined by pins 29 engaged in the openings 18 and 19 and the corresponding holes of the branches 3 and 4.
• plates 30 fixed by screws 31 ensure the fixing. It is understood that the positioning of the spouts on the clamp by means of the pins 29 and the screws 31 is carried out as a function of the diameter of the terminal part of the drill, so that in the closed position, with the control member 26 in the offset position , the pivoting device 5 is in a state of elastic bending ensuring the clamping of the terminal part of the drill, so that the grinding can be carried out safely.
• the member 26 is moved to the ramps 27, 28, which has the effect of opening the clamp and therefore allowing the drill to be released.
• each set of spouts adapted to the different grinding drills can be mounted case by case on the same pliers. However, it may also be preferable to provide that each set of spouts is permanently mounted on different pliers.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Jigs For Machine Tools (AREA)
• Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
• Grinding Of Cylindrical And Plane Surfaces (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34967405

Family Applications (1)

Country Status (6)

Families Citing this family (8)

Family Cites Families (8)

• 2005
  • 2005-04-29 TW TW094113811A patent/TW200607602A/zh unknown
  • 2005-05-24 EP EP05740399A patent/EP1750901A1/fr not_active Withdrawn
  • 2005-05-24 WO PCT/CH2005/000290 patent/WO2005118219A1/fr not_active Ceased
  • 2005-05-24 KR KR1020067027533A patent/KR20070024662A/ko not_active Withdrawn
  • 2005-05-24 JP JP2007513646A patent/JP2008500908A/ja active Pending
  • 2005-05-24 CN CNB2005800226473A patent/CN100519067C/zh not_active Expired - Fee Related

Non-Patent Citations (1)

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