208results about "Stepped drills" patented technology

A drill bit is disclosed having a cutting portion having a plurality of axially aligned, graduated cutting members. Each of the members has cutting edges defined by a single slot extending therethrough. A tip portion at one end of the cutting portion defines at least a pair of cutouts therein, wherein one of the cutouts is aligned with the slot.

A spiral drill bit for forming holes of a variety of sizes has a main body which provides first and second helical grooves. First and second flutes extend along the length of the main body to provide first and second helical groove segments. Cutting segments are provided between the helical groove segments. The method for forming the spiral drill bit includes turning the helical groove segments onto a round stock. An axial clearance and an initial diametral clearance are provided upon turning the helical grooves. A grinding process is used to form a radial clearance and a final diametral clearance. The reduction to the amount of grinding required to form the spiral drill bit results in a reduction to the cost of production and a reduction in the time necessary to produce the spiral drill bit.

A solid step drill, including a front tip and a rear end between which a center axis extends and around which the drill is rotatable in a predetermined direction. At least two cylindrical sections are concentric with the center axis, a first section extending rearward from the front tip and having a first diameter, and a second section extending behind the first section and having a second diameter that is greater than the first diameter, the first section transforming into the second section via a step. The tip includes two primary cutting edges, which individually co-operate with a respective chip flute that is delimited by a concave surface and countersunk in the first section and in the second section, the respective chip flute intersecting the step while forming a secondary cutting edge. Adjacent to the secondary cutting edge, a chip breaking recess is formed between a cutting edge line of the cutting edge and the concave surface.

A segmented orbital drill includes a segmented portion with a semi-finishing cutting portion and a plurality of finishing cutting portions. The semi-finishing cutting portion and finishing cutting portions are separated by grooves formed by a front wall and a rear wall. The segmented portion allows for a fresh cutting edge (i.e., rear wall of the groove) to be revealed as the orbital drill wears in the axial direction. The segmented portion also causes less contact with the workpiece, which reduces power consumption and minimizes deflection of the orbital drill. The segmented orbital drill also includes an optional pilot at one end of the drill, and a clearance neck portion between a shank and the segmented portion. A method of machining a workpiece using the segmented orbital drill is also disclosed.

A coupler for a quick change rotary cutting tool assembly allowing a cutter to be quickly and releasably coupled to a shank wherein the coupler has a cylindrical portion with a threaded portion to engage the shank and a portion with a transverse groove with undercut walls to form recesses. The cutter has an anchor made as a disk with parallel flats which engage the recesses of the cylindrical portion to releasably secure the cutter to the shank.

A modified prior art twist drill embodies structural features that require less energy to drill a hole during a normal plunge operation and allow for lateral cutting movement during extraction of the twist drill from a drilled work piece.

A unibit with replacement blade provides economical refreshing of the many cutting facets of a unibit drill bit with a unibit replacement blade that is releasably secured in the unibit body. In one aspect of the invention, a replacement blade with cutting edges on one or both opposite side edges is releasably locked into the unibit body by a transverse locking screw. The blade can be provided with an integral tip drill when desired. In another aspect of the invention, one or more replacement blades is releasably secured in a recess in the unibit body with a simple blade lock mechanism, the blades being positioned symmetrically around the axis of the drill. In one embodiment, the blade lock is an eccentric cam member that rotates into and out of locking engagement with the blade. Other blade locks include clamping screws, screws through the blade, cam plates, tapered blades, and blade receiving grooves. Another aspect of the invention provides a replaceable tip drill.

A drill includes a substantially cylindrical cutting portion includes a first region located at a front end portion, and a second region which has a step whose diameter increases as going from the first region to a rear end in a sectional view perpendicular to a rotation axis, and which is continuous with the first region in an end of the second region on a side of the step, and using this drill, a method of manufacturing a machined product is provided.

A system, apparatuses and methods for anchoring are provided. The system includes two-stage drill bit and a method of anchoring into a two-stage hole drilled by the drill bit. The apparatus of the instant invention includes a two-stage drill bit for drilling a pilot hole for a common nail into a material such as concrete, stone, masonry or cementuous or other materials. The method of the instant invention includes the steps of drilling a first hole within a material to which an object is to be anchored, drilling a second hole concentric with the first hole, and placing an anchor within the holes.

The invention relates to a multi-step multi-micro-blade drill bit for drilling carbon fiber reinforced composite plastics. The multi-step multi-micro-blade drill bit comprises a step cutting area, a micro-tooth cutting area, an auxiliary cutting area, an inverse taper area and a clamping area. The step cutting area is formed by n stages of stepped structures; each stage of stepped structure is formed by a step main cutting area and a step auxiliary area; the micro-tooth cutting area is located in the step cutting area and formed by n stages of micro-tooth structures which are sequentially distributed in a direction from a drill point to the clamping area; and the inverse taper area is located on the auxiliary cutting area. The multi-step multi-micro-blade drill bit provided by the invention has the step structures, and the micro-tooth structures are distributed on auxiliary cutting blades of all stages of step structures, so that burrs produced in the drilling process can be rebounded into the micro-tooth structures and cut off by micro teeth, so that the burrs in an inlet and an outlet can be effectively removed, and the layering and tearing damage during final hole forming is reduced; and an inverse taper structure is adopted, so that the vibration of a hole inlet side in the final forming stage of drilling is reduced, and the hole diameter accuracy and the inlet quality are improved.

A device and a method are provided to allow a user to ream a hole to an accurate final diameter as desired, and at the same time, to cold work the hole to induce a beneficial residual stress that will enhance the life of the component by retarding the onset and growth of fatigue cracks in the hole. The basic design of the device has an elongated body having a forward end portion to extend through a hole to be reamed and cold worked, a reamer section formed on the circumference of the forward end portion to enlarge the hole, and a burnishing section formed on the circumference of the elongated body adjacent to the reamer. The burnishing section is operative to upset the material around the hole, so as to result in a residual stress beneficial to the hole. The reamer section is in the form of a plurality of cutting edges extending from a tip of the elongated body, while the burnishing section is also in the form of a plurality of cutting edges adjacent to the reamer section along the elongate body. The cutting edges of the reamer sections are parallel straight cutting edges or helical cutting edges. The cutting edges of the burnishing section are configured with an orientation opposite to that of the cutting edges of the reaming section. Therefore, when the cutting edges of the burnishing section are configured with the same profile as the cutting edges of the reamer section, the burnishing section is in the form of a backward reamer section.

A bit for removing a broken fastener comprises a tip from which extend two or more notches separated by scraping surfaces formed from two-sided frusto-conically-shaped regions. The scraping surfaces are bounded on one side by a cutting edge and on the other side by a non-cutting edge and are configured to cut into the fastener when the bit is rotated in a direction opposite to the fastener's direction of engagement. Specific embodiments include configurations where the cutting edges extend at different angles with respect to the bit axis and where the scraping surfaces comprise a plurality of serrations.

Provided is a tool life managing apparatus for a stepped tool capable of appropriately managing the tool life of each blade provided to the stepped tool and reducing cost and work for blade replacement. A tool life managing apparatus 1 manages the tool life of a stepped tool 10 provided with a plurality of replaceable blades in a multi-stage manner, and includes: a blade data storing unit 32 that stores, for each of the plurality of blades, a threshold concerning the tool life of the blade, an evaluation value indicating the degree of use at present of the blade, and a level distance from a leading-end blade; an accumulated machining count value acquiring unit 45 that acquires accumulated machining count values of a working machine 5 before and after machining by the stepped tool 10; an evaluation value updating unit 46 that updates the evaluation value of each blade on the basis of the accumulated machining count values, the evaluation value, and the level distance; and an evaluation value determining unit 47 that determines whether or not the updated evaluation value reaches the threshold.

The invention aims to provide a stepped drill capable of adjusting depth of a stepped hole. The stepped drill comprises a drill handle and a first drill blade mounted at the end of the drill handle. The stepped drill is characterized in that the stepped drill is provided with an accommodation hole extending from the head end of the first drill blade into the drill handle or the tail end of the drill handle, a second drill blade is mounted in the accommodation hole and exposed outside the accommodation hole, and the diameter of the second drill blade is small than that of the first drill blade. The stepped drill is provided with a fixing structure used for fixing the first drill blade and the second drill blade relatively. The stepped drill is capable of adjusting the exposure length of the second drill hole blade since the first drill blade is of hollow structure, thus, depth of the stepped hole drilled is adjustable, and the stepped drill is more convenient to use and highly practical.

A bit for removing a broken security fastener having an elongated shaft with a longitudinal axis. The shaft has a first end and a second end. The first end terminates in a tip region having a recess for receipt of the post of the security fastener, the recess being disposed substantially along the longitudinal axis. The second end of the shaft is configured to be received by the chuck of a tool which provides rotational torque.

The invention provides an overall arc-edge step drill with a function of controlling the burr form. The overall arc-edge step drill with the function of controlling the burr form comprises a drill handle and a drill bit; and the drill bit comprises a front tool face, a main rear tool face, a main cutting edge and an auxiliary cutting edge. The main rear tool face and the main cutting edge are in a step shape; and the main cutting edge is divided into three segments, namely, a front cutting edge, a transition cutting edge and a rear cutting edge. The front cutting edge and the rear cutting edge are each in an arc shape; and the transition cutting edge is in a straight line shape and is arranged between the front cutting edge and the rear cutting edge. The vertex angle of the front cutting edge at the position of a drill point is not larger than 118 degrees; the difference between the diameter of the cylindrical face where the rear cutting edge is located and the diameter of the cylindrical face where the front cutting edge is located is smaller than 5 mm; and the helical angle of the auxiliary cutting edge ranges from 35 degrees to 40 degrees. The overall arc-edge step drill with the function of controlling the burr form can effectively control production of burrs in drilling machining, the drilling quality and the drilling efficiency are both improved, and the overall arc-edge step drill with the function of controlling the burr form is simple in structure and convenient to manufacture and can be widely used in the machining field.

The invention relates to an adjustable step drill bit which comprises a large drill bit body, an adjustment screw, a small drill bit body and a sleeve. The whole large drill bit body is of a cylindrical structure, and a circular through hole is formed in the center of the large drill bit body and longitudinally penetrates through the whole large drill bit body; meanwhile, an unthreaded hole and a threaded hole are transversely formed in the two opposite ends of the middle of the large drill bit body respectively. A conical surface is arranged at one end of the large drill bit body, and a cutting edge of the large drill bit body is arranged at the other end of the large drill bit body. The small drill bit body is located in the circular through hole of the large drill bit body and can vertically move in the whole circular through hole. Through holes same in size are transversely and evenly formed in the small drill bit body in parallel. The sleeve is installed on the outer surface of the small drill bit body in a sleeved mode. Kidney-shaped holes are formed in the two opposite ends of the sleeve. A lug hole is formed in one end of the sleeve. The adjustment screw penetrates through the unthreaded hole, the corresponding through hole, the kidney-shaped holes and the threaded hole to enable the large drill bit body, the small drill bit body and the sleeve to be fastened together. According to the adjustable step drill bit, the drilling diameter and the drilling depth can both be changed, and the concentricity of a step hole can be effectively guaranteed.