6results about "Conical drills" patented technology

The application provides a special drilling tool for drilling a taper hole and a manufacturing method thereof, and steps are as follows: step 1, preparing a blank; step 2, processing a taper; step 3, processing a grinding groove; step 4, processing a main flank surface 2 of a chisel; step 5, grinding two main flank surfaces 1 of a drill tip; and step 6, grinding a first chip flute. The application is used for drilling a small inner hole and a large outer hole, effectively improves the drilling efficiency of the taper hole, and solves the processing problem of one-time forming of the taper hole.

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.

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 aim of the invention is to improve the smooth running and reduce the tendency to chatter in countersinking tools, comprising a connection point for introducing a torque with respect to a rotational or drive axis by means of a drive device and comprising a cutting assembly with four cutting edges which are uniformly slanted by a polar angle of 45°±0.5° with respect to the rotational or drive axis. This is achieved in that the four cutting edges (4, 5, 6, 7) are to be arranged in pairs so as to be rotationally offset relative to one another by four different partial angles with respect to the rotational or drive axis, wherein the four partial angles increase in order over the circular arc, and the smallest partial angle between two cutting edges (4, 5) lies in an angular range of 74° to 76°

The aim of the invention is to improve the smooth running and reduce the tendency to chatter in countersinking tools, comprising a connection point for introducing a torque with respect to a rotational or drive axis by means of a drive device and comprising a cutting assembly with four cutting edges which are uniformly slanted by a polar angle of 45°±0.5° with respect to the rotational or drive axis. This is achieved in that the four cutting edges (4, 5, 6, 7) are to be arranged in pairs so as to be rotationally offset relative to one another by four different partial angles with respect to the rotational or drive axis, wherein the four partial angles increase in order over the circular arc, and the smallest partial angle between two cutting edges (4, 5) lies in an angular range of 74° to 76°

A drill bit includes a shank extending along a bit axis and a body portion coupled to the shank. The body portion having a distal end and defining a plurality of axially stacked, progressively sized steps. The body portion defining a body flute having a flute surface. The drill bit includes a first indicium formed on the flute surface adjacent a first step of the plurality of steps, the first indicium including a number and an indicator band around the number and a second indicium formed on the flute surface adjacent a second step of the plurality of steps and spaced from the first indicium, the second indicium including a number and an indicator band around the number, wherein the first indicium is spaced from the second indicium by at least one step of the plurality of steps.