Abstract

A deep hole drill, wherein, even if drive of a spindle stops quickly when processing is competed, stopping rotation of a drill tube, a drill head does not come out of the front end of the drill tube. A drill head (1) mounted to the front end of a drill tube (2) has a rear section having formed thereon a first fitting shaft section (5), a male screw thread section (6), and a second fitting shaft section (7) which have diameters gradually increasing from the rear end side of the rear section to the front side.  The front end of the drill tube (2) is provided with a first fitting hole section (8) fitted in a spigot-and-socket manner to the first fitting shaft section (5), a female screw thread section (9) engaged with the male screw thread section (6), and a second fitting hole section (10) fitted in a spigot-and-socket manner to the second fitting shaft section (7).  Projections (12) are provided at at least three circumferential positions on the outer peripheral surface of the second fitting shaft section (7) of the drill head (1).  When the drill head (1) is mounted to the front end of the drill tube (2), the second fitting shaft section (7) of the drill head (1) is fitted in a spigot-and-socket manner and with interference to the second fitting hole section (10) of the drill tube (2).

IPC Classes  ?

• B23B 51/06 - Drills with lubricating or cooling equipment

Abstract

Provided is a drill head manufacturing method, in which the features of a CVD method can be effectively utilized by applying a CVD coating treatment, at the time of a drill head manufacture which can adopt only the PVD coating treatment in the prior art, thereby to elongate the tool lifetime and to manufacture a drill head suited for a high-speed cutting operation. The drill head manufacturing method comprises soldering a cutting tip (2) CVD-coated with a hard material to an essential portion of the tip side of a head body (1), polishing the outer diameter portions (OD) of the soldered tip (2) around the rotation axis (G) of the head body (1), and then PVD-coating the cutting tip (2) and the head body (1) with a hardening material at a temperature lower than that for soldering.

IPC Classes  ?

• B23P 15/32 - Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools twist-drills
• B23B 51/00 - Tools for drilling machines
• B23B 51/06 - Drills with lubricating or cooling equipment

Abstract

Provided is a deep-hole boring drill head, which causes no disc to clog chip discharge ports when the head body of a drill head passes through a cutting object. The deep-hole boring drill head is constituted such that a central cutting blade tip (6) is so mounted at a head center portion to confront chip discharge ports (4 and 5) that the blade edge (6a) of the blade tip is inclined downward to the head center portion, such that a circumferential cutting blade tip (7) is so mounted on the circumferential portion that the blade edge (7a) of the blade tip is inclined upward to the head center portion, such that an intermediate cutting blade tip (8) is so mounted on an intermediate portion that the blade edge (8a) of the blade tip is inclined upward to the head center portion, and such that the inside of the hollow portion (3) of a head body (2) is a chip discharge passage communicating with the chip discharge ports (4 and 5). At the head center side end portion of a relief face (8b) of the intermediate cutting blade tip (8) inclined upward to the head center portion, a disc breaker (12) is formed to have a face inclined downward to the head center portion.

IPC Classes  ?

• B23B 51/06 - Drills with lubricating or cooling equipment

Abstract

Provided is a deep-hole boring throwaway tip of three-time symmetry, which can be applied as a central blade for a drill head to both a whole cutting type and a non-cutting core folding-off type. The deep-hole boring throwaway tip is formed into a thick plate type having such a three-time symmetry that three sections (P1 - P3) divided at a center angle of 120 degrees are identically shaped. The blade edge (1) to confront in the boring direction when the tip is mounted in drill heads (D1 and D2) forms an angle shape corresponding to a first section (P1) with a shorter inner blade (11) and a longer outer blade (12), and the outer blade (12) is constituted of two continuous blade portions of a crest-side outer blade portion (12a) of a smaller outer blade angle (β1) and a foot-side outer blade portion (12b) of a larger outer blade angle (β2).

IPC Classes  ?

• B23B 51/00 - Tools for drilling machines
• B23B 51/06 - Drills with lubricating or cooling equipment

Abstract

Provided is a deep-hole boring drill head, in which a blade tip is mounted to face the chip-discharging port of a head tip face, and in which a hollow inside is made into a chip-discharging passage to communicate with the chip-discharging port. The deep-hole boring drill head can acquire a high cutting efficiency on the basis of the excellent chip dischargeability, and the cutting blade itself has an easily workable shape. The deep-hole boring drill head is constituted such that the inner end (20a) of the blade edge (20) of a central cutting blade tip (2A) is so spaced from a head axis (O) as to form a non-cutting zone (Z) near the head axis (O), and such that the inner side face of the central cutting blade tip (2A) forms an inclined face (21) inclined from the blade edge side to the head axis (O). In the cutting operation, the non-cutting core (C) of a cutting work (W), which is formed in the non-cutting zone (Z), is folded off by the forced contact of the inclined face (21) of the cutting blade tip (2A).

IPC Classes  ?

• B23B 51/06 - Drills with lubricating or cooling equipment
• B23B 51/00 - Tools for drilling machines

Abstract

A gun drill with a single cutting edge exhibiting high cutting efficiency in which strict positional precision is not required when a cutting edge chip is brazed as a cutting edge, the cutting head can be manufactured easily and the cutting edge itself has an easy-to-machine profile. The cutting edge (5) is arranged such that the inner end (51a) of the edge (51) is spaced apart from the central axis (O) of a head to form a non-cutting zone (Z) in the vicinity of the central axis (O), the side face (52) of the cutting edge on the inner end (51a) side is a surface inclining from the inner end (51a) to the central axis (O) side of the head, and the non-cutting core (C) of a material (W) to be cut occurring in the non-cutting zone (Z) during cutting work is pushed by the inclining side face (52) of the cutting edge and broken off.

IPC Classes  ?

• B23B 51/06 - Drills with lubricating or cooling equipment
• B23B 51/00 - Tools for drilling machines

Abstract

This aims to provide a system for monitoring the supply pressure of a coolant thereby to interrupt the deep-hole boring operation of a deep-hole boring apparatus, if troubled, reliably so that the deep-hole boring apparatus can be used efficiently even in the operation to bore a deep hole of a small diameter. The deep-hole boring apparatus control system comprises the deep-hole boring apparatus (1) for working a workpiece (W), a pump mechanism (2) for feeding a coolant (C) to the deep-hole boring apparatus (1), a pressure sensor (4) for monitoring the supply pressure of the coolant (C) fed from the pump mechanism (2), and a control device (7). When the deep-hole boring apparatus (1) works the workpiece (W), the control device (7) presets what value of the supply pressure of the coolant (C) monitored by the pressure sensor (4) is not abnormal. If the preset value is exceeded by the value of the supply pressure of the coolant (C) monitored by the pressure sensor (4), the control device (7) decides that the deep-hole boring apparatus (1) has been troubled, and generates an abnormal signal to interrupt the working of the workpiece (W).

IPC Classes  ?

• B23B 47/00 - Constructional features of components specially designed for boring or drilling machinesAccessories therefor
• B23Q 11/00 - Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling workSafety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
• B23Q 11/10 - Arrangements for cooling or lubricating tools or work

Abstract

A gun drill which can supply coolant sufficiently to a cutting part even when the cutting edge or the guide pad is of a brazed type or when the opening angle of a chip discharge groove is large or when the tool diameter is small, and can attain a high machining efficiency by discharging chips efficiently from the cutting part. A gun drill has coolant supply passages (3a, 3b) in a tool shank (1) and a cutting head (2), and one linear chip discharge groove (4) provided in the outer circumferential surface from the base end side of the tool shank (1) to the tip of the cutting head (2) along the longitudinal direction. The cutting head (2) is provided with a coolant lead-out groove (5) in the outer circumferential surface part (20a) on the back side with respect to the chip discharge groove (4), and the coolant lead-out groove (5) extends from the middle portion of the head in the longitudinal direction to the tip thereof. The coolant lead-out opening (5a) communicating with the coolant supply passage (3b) is provided at the base end side of the coolant lead-out groove (5).

IPC Classes  ?

• B23B 51/06 - Drills with lubricating or cooling equipment
• B23B 51/00 - Tools for drilling machines

Abstract

A gun drill in which coolant delivered to a cutting part can be discharged intensively to a chip discharge groove along with the chips, damage on the inner circumference of a drilled hole or fall of machining precision due to clogging with chips can be prevented, and cutting efficiency is enhanced by reducing rotary load and long lifetime can be attained. Coolant supply paths (10, 20) are provided in a tool shank (1) and a cutting head (2), one chip discharge groove (3) is provided in the outer circumferential surface from the proximal side of the tool shank (1) to the distal end of the cutting head (2), discharge ports (22a, 22b) communicating with coolant supply holes (21a, 21b) and a chip discharge groove (32) are provided in the distal end face (2c) of the cutting head (2), and annular protrusions (4a, ...) are formed in the outer circumferential surface of the cutting head (2) continuously over the entire circumference while bridging above the chip discharge groove (3).

IPC Classes  ?

• B23B 51/06 - Drills with lubricating or cooling equipment

Abstract

Provided is a deep hole cutting apparatus having a chip-replaceable guide pad on a cutting head section. With the deep hole cutting apparatus, finish qualities of a cut hole to be formed can be improved and the service life of the guide pad is lengthened. A guide pad (3A) which is slidably brought into contact with the inner circumference of a cutting hole (H) is removably attached with an attaching screw (17b) to a pad attaching recessed section (18) which is formed on the outer circumference of a cutting head section (11). The top portion (P1) of the guide pad (3A) protrudes outward in the diameter direction from a cutting circumference (S) of a cutting blade (outer circumference side cutting blade (2A)).

IPC Classes  ?

• B23B 51/00 - Tools for drilling machines
• B23B 51/06 - Drills with lubricating or cooling equipment

Abstract

Provided is a deep hole cutting apparatus having a chip-replaceable guide pad on a cutting head section. With the deep hole cutting apparatus, high machining accuracy can be obtained in a stable cutting status and the service life of the guide pad is lengthened. A guide pad (7) is formed on a circular surface (71a) whose outer surface forms a top ridge section (7a) along the center portion in the width direction, and the guide pad is diagonally attached to a cutting head section (10a) so that the leading end side of the tool is closer to the front side in a tool rotating direction (y) compared with the rear end side of the tool.

IPC Classes  ?

• B23B 51/00 - Tools for drilling machines
• B23B 51/06 - Drills with lubricating or cooling equipment

Abstract

Provided is a deep hole cutting apparatus having a guide pad brazed to a cutting head section. With the deep hole cutting apparatus, high machining accuracy can be obtained in a stable cutting status and the service life of the guide pad is lengthened. A guide pad (5) brazed to a cutting head section (10a) is diagonally arranged so that the leading end side of the tool is closer to the front side in a tool rotating direction (y) compared with the rear end side of the tool.

IPC Classes  ?

• B23B 51/00 - Tools for drilling machines
• B23B 51/06 - Drills with lubricating or cooling equipment

Abstract

Hollow shanks of the same diameter and different lengths used as gun drills can be easily manufactured with high efficiency and at low cost by cutting an elongated raw material having a V-groove over the full length without producing a large amount of unwanted short tubes. A gun drill (G1) comprises a hollow shank (1) having a V-groove (11) along the length in the outer peripheral surface, a tubular driver (3) into which the rear end (1b) of the hollow shank (1) is inserted and secured, a cutting head (2) secured to the front end (1a) of the hollow shank (3). A coolant (C) introduced into the tubular driver (3) is passed through the inside of the hollow shank (1) and supplied to the cut portion through the coolant discharge hole (21) of the cutting head (2) and discharged through the V-groove (11) together with the cuttings (S). The hollow shank (1) has the V-groove (11) over the full length, a groove closing piece (8) for closing the V-groove (11) by filling in the V-groove (11) with the groove closing piece (8) is secured to the rear end (1b) inserted into the tubular driver (3) of the hollow shank (11).

IPC Classes  ?

• B23B 51/06 - Drills with lubricating or cooling equipment

Abstract

Provided is a method for manufacturing such a drill head easily but reliably at a low cost as is given a high sizing precision and an edge precision by soldering cutting blade tips to the cutting blade seats of a head body. The method manufactures a drill head (10), in which a screw shank (2) is screwed and connected to the leading end portion of a tool shank (5) of a deep hole cutting drill, so that constricting circumferential portions (22 and 23) on the two sides of a male thread portion (21) are used in close contact with the circumference of the tool shank (5). A shank cylinder member (20A) having a cutting allowance (7) left at least on the constricting circumferential portions (22 and 23) is welded and integrated to the rear end of a head body (1) having cutting blade chips (30a to 30c) soldered thereto, and the cutting allowance (7) of the shank cylinder member (20A) is cut and finished into the screw shank (2).

IPC Classes  ?

• B23P 15/32 - Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools twist-drills
• B23B 51/06 - Drills with lubricating or cooling equipment

Abstract

Disclosed is a means for preventing the formation of a spiral mark in the inner side surface of a through-hole and achieving excellent appearance of the through-hole and high machining accuracy in the formation of the through-hole in a machining material by means for a drill-head equipped with a brazed cutting blade. A through-hole (H) is formed on a machining material (W) by means of a drill-head (1A) equipped with cutting blades (3A-3C) brazed onto blade mounting seats (13a-13c). The drill-head (1A) has a rounded portion (R) in an outer blade edge (31a) of the cutting blade (3A) for cutting the outermost peripheral area of the machining material (W).

IPC Classes  ?

• B23B 51/00 - Tools for drilling machines
• B23B 51/06 - Drills with lubricating or cooling equipment