13results about "Stepped drills" patented technology

A rotary tool may include a base. The base may be extended from a first end to a second end. The base may include a first part and a second part. The first part may include the first end. The second part may have a larger outer diameter than the first part. The first part may include a first flute. The second part may include a second flute. In a first cross section of the first part, the first flute may include a first bottom part. A center of a first imaginary circle overlapping with the first bottom part may be located outside a circumscribed circle of the first part. In a second cross section of the second part, the second flute may include a second bottom part. A center of the second imaginary circle overlapping with the second bottom part may be located inside a circumscribed circle of the second part.

A drill, in particular for drilling metal, includes a cutting part which has a drill point and at least two helical grooves which extend from the drill point to an end of the cutting part opposite the drill point, and in the region of the drill point, each lead into a thinned region. The thinned regions form a cross-grinding. The thinned regions each have an opening angle of less than 30°.

A step drill bit including a shank extending along a bit axis and a body having a proximal end adjacent the shank and a distal end opposite the proximal end. The body includes a bit tip adjacent the distal end. The bit tip includes a diameter in a direction perpendicular to the bit axis. The body defines a plurality of axially stacked, progressively sized steps including a first step adjacent and a terminal step. Each step of the plurality of steps defines a length and a diameter. The step drill bit also includes at least one flute in the body. Each flute extends from the distal end to the proximal end. The step drill bit includes a cutting edge on the flute. A ratio of the diameter of the bit tip to the length for a majority of the plurality of steps is in a range from 1.0 to 1.5.

The present invention relates to a tool blank (30) for a cutting tool (1), such as an end mill, drill or engraving tool, comprising a tool shank (2) adapted to be received in a rotary tool holder of a processing machine and a cutting head blank (3) fixedly connected to the tool shank (2). The cutting head blank (3) comprises a plurality of cutting head blank elements (5) which are fixedly connected to one another, preferably soldered to one another and made of a hard material, in particular polycrystalline diamond. Furthermore, the present invention relates to a cutting tool (1), such as an end mill, drill or engraving tool, in which at least one tool cutting edge (15) is generated in the tool blank (30) according to the invention, which extends over the plurality of fixedly interconnected cutting head blank elements (5). Furthermore, the present invention relates to a method for manufacturing a tool blank and a method for manufacturing a cutting tool.

The invention provides a drill bit, in particular serpentine drill, more in particular an auger bit, comprising a circumferential chip removal groove helically about a drill axis and a centering tip having a conical shape with an apex on said drill axis, comprises a lateral cone surface that has a taper angle, comprising a centering tip helical thread which spirals helically from said apex down said centering tip in a thread direction of rotation at a tip thread pitch, and comprising at least one tip recess in a side of the centering tip which provides a cutting edge, an which has a chiptransporting shape and connecting to said circumferential external thread, characterized in that said cone surface comprises at least one step in said taper angle of said lateral surface with each step starting at a step-start position and said at least one step continues about said drill axis at least 90 degrees.

The present drill point arrangement includes a first and second land defined by a first and second flute, with a first cutting tip and a second cutting tip formed on the first and second lands respectively. The first cutting tip being positioned a first radial distance and the second cutting tip being positioned a second radial distance, each measured from the axis of rotation. The second cutting tip is positioned next in cutting tip sequence to the first cutting tip, and the second radial distance of the second cutting tip is greater than the first radial distance of the first cutting tip. Optionally, the first cutting tip is positioned a first axial distance and the second cutting tip is positioned a second axial distance, each measured from the front tip, and the second axial distance is greater than the first axial distance.

The invention relates to a drilling section for a hole machining tool, characterized in that the drilling section comprises: at least two chip flutes; each side part comprises a plurality of step part section parts, the step part section parts, belonging to the same serial number, on all the side parts form the same step part section, and each side part further comprises a transition part section part; a plurality of main cutting edges; a plurality of secondary cutting edges; at least one step section is designed as an asymmetrical step section, the same asymmetrical step section having in the circumferential direction at least two asymmetrical step section parts which are separated by flutes, which form, in accordance with at least two flutes, at least two asymmetrical cutting edges, and wherein at least one of the step sections is designed as an asymmetrical step section, said asymmetrical step section parts having, in the circumferential direction, at least two asymmetrical cutting edges, the at least two asymmetric tips have different radial distances from the working axis of rotation and are arranged axially offset from each other in the direction of the working axis of rotation. The invention further relates to a hole machining tool.

A step drill bit includes a shank and a body that defines a plurality of axially stacked, progressively sized steps including a first step, a terminal step, and a plurality of intermediate steps having incrementally increasing diameters disposed between the first and terminal steps. The step drill bit includes a flute in the body extending from the distal end to the proximal end and a plurality of cutting edges formed in the body. Each cutting edge is disposed along one of the plurality of steps. Each cutting edge defines a helix angle and a radial rake angle. The helix angle of the cutting edge at a first intermediate step of the plurality of intermediate steps is greater than the helix angle at the first step. The radial rake angle of the cutting edge at the first intermediate step is greater than the radial rake angle at the first step.

A drill bit for use with construction using cross laminated timbers (CLT) is provided. The bit has both sharpened and dull portions of the cutting element of the bit, so that it can clean- out an opening in the CLT that has been partially obscured by shifts in the laminated constituents of the CLT, without elongating or otherwise changing the shape of the fastener opening. The use of the bit is made at the construction site in fastener openings previously made and otherwise obscured, thereby allowing the quick assembly and construction of a structure made of CLT.

A drill bit (10) that includes: a shaft (12) extending along a drill axis (14); a transition section (16) which is connected to the shaft (12); a body section (18) having a front end (21) and comprising a plurality of axially superimposed, progressively increasing steps (20A-20M) including a first step (20A) at the front end and a last step (20M) connected to the transition section (16), wherein the first stage (20A) has two tip clamping grooves (42) which are each arranged at an angle of the tip clamping groove (44, 50) to the drill axis (14), the body section (18) further having two body clamping grooves (46) which each extend from the first stage (20A) to the transition section (16) and are arranged at an angle of the body clamping groove (48) which differs from the angle of the tip clamping groove (50); and a drill tip (21) located at the front end (21) of the body section (18) and having a cutting edge (28) that crosses the drill axis (14), wherein a first cutting surface (24) is located on one side of the cutting edge (28) and a second cutting surface (26) is located on an opposite side of the cutting edge (28), wherein the first cutting surface (24) has a first clearance angle (36) and the second cutting surface (26) has a second clearance angle (38) which differs from the first clearance angle (36); wherein each tip-chipping groove (42) extends to the first cutting surface (24) or the second cutting surface (26) to define at least part of an edge (32) of the first cutting surface (25) or the second cutting surface (26); wherein the angle of the body clamping groove (48) of each body clamping groove (46) is formed as a compound angle defined by a first angle of the body clamping groove (48) and a second angle of the body clamping groove (72), wherein the first angle of the body clamping groove (48) is measured between a center line (72) of each body clamping groove (46) and the drill axis (14) in a first plane, and the second angle of the body clamping groove (72) is measured between the center line (71) of each body clamping groove (46) and the drill axis (14) in a second plane which is orthogonal to the first plane; wherein the first angle of the body span groove (48) is between about 4.5 degrees and about 5.5 degrees, and wherein the second angle of the body span groove (72) is between about 1 degree and about 3 degrees.

The present invention relates to a drilling part for a hole drilling tool, the drilling part having at least two chip flutes and a plurality of sides, wherein each side has a plurality of step segment portions, and step segment portions with the same serial number on all sides form a single step segment, and each side further has a transition segment portion, and has a plurality of major cutting edges, a plurality of minor cutting edges, and a plurality of cutting edge tips, wherein at least one step segment is formed as an asymmetric step segment, and the single asymmetric step segment has at least two asymmetric step segment portions separated in the circumferential direction by a chip flute, and the at least two asymmetric step segment portions and the at least two chip flutes correspondingly form at least two asymmetric cutting edge tips, the at least two asymmetric cutting edge tips having different radial distances from an operating rotation axis and being axially offset relative to each other in the direction of the operating rotation axis.

The invention relates to the technical field of cutters, and discloses a multi-stage stepped drill bit and an axial force self-adaptive balancing device thereof.The multi-stage stepped drill bit comprises a drill handle fixedly installed at one end of a drill bit body, the section of the drill handle is arranged to be in a regular hexagon shape, a rotating shaft fixedly connected with a driving source is arranged at one end of the drill handle, and three clamping blocks used for clamping the drill handle are slidably installed at the end of the rotating shaft; according to the multi-stage stepped drill bit, the six telescopic rods are driven by the rotating sleeve to synchronously conduct centripetal movement and contraction, the rollers can abut against the six faces of the drill handle, when the drill handle moves, the corresponding rollers are pushed to deviate, the corresponding rotating rods rotate, and the drill handle is driven by the rotating sleeve to rotate. The roller corresponding to the other end of the rotating rod deviates in the reverse direction according to the lever principle, the drill handle is assisted to keep straight-line channeling, channeling of the drill handle can be effectively guided no matter which direction the drill handle shifts, and axial force borne by a drill bit is kept balanced.

The invention relates to the technical field of step expanding drills, and belongs to a mechanically-clamped variable-cutting-depth step expanding drill which comprises a tool bit and a tool handle, the tool bit and the tool handle are connected through a distance adjusting assembly, and the head of the tool bit and the head of the tool handle are each provided with a blade assembly. The cutting outer circle of the blade assembly arranged on the head portion of the cutter handle is larger than that of the blade assembly arranged on the head portion of the cutter head. The relative depth position of a machined broaching step can be changed by changing the position relation between the tool bit and the positioning bolt, self-locking of the tool bit is completed by changing the limiting position of the positioning bolt, the relative depth of the broaching step can be adjusted, meanwhile, stable connection and stable cutting of the tool bit are guaranteed, and the machining efficiency is improved. And the machined surface quality and the cutting efficiency are ensured. The transposition blade at the position of the cutter handle can be detached for single reaming, one cutter has multiple purposes, the cost of the cutter is reduced, use is convenient, and the machining efficiency is high. And the cutting blades are indexable, and the overall service life is long.