CN102490213A

CN102490213A - Four-groove gang drill

Info

Publication number: CN102490213A
Application number: CN2011103594991A
Authority: CN
Inventors: 邓德勇
Original assignee: PIXIAN SENMU CUTTING TOOL WORKS
Current assignee: PIXIAN SENMU CUTTING TOOL WORKS
Priority date: 2011-08-19
Filing date: 2011-11-14
Publication date: 2012-06-13
Also published as: CN202318477U

Abstract

The invention discloses a four-groove gang drill which comprises a cutting part (1) and a shank (2) that are connected in sequence. Two spiral chip grooves (3) are formed on the cutting part (1), the part between the spiral chip grooves (3) forms a cutter body (4), a positioning tip (5) is protruded from the center at the front end of the cutting part (1) and formed by four inclined positioning surfaces (6), the prismatic intersection of the four inclined positioning surfaces (6) forms a positioning edge (7), two downwardly sheer inclined surfaces (8) in outward symmetry are formed on the positioning tip (5), the inclined surfaces (8) and the groove bottoms of the spiral chip grooves (3) form end edges (9), the end edges (9) and the peripheral surface of the cutting part (1) form two outer side tips (10), and spiral auxiliary chip grooves (11) are formed on the cutter body (4). The invention has the following benefits: chip removal effect is good, and processing surface quality is improved; service life is prolonged; positioning is accurate, and drill offset is avoided; and assembly and disassembly are simple and convenient.

Description

Four groove gang drills

Technical field

The present invention relates to carpenter's gang drill technical field, be specifically related to a kind of four groove gang drills.

Background technology

Carpenter's gang drill is a kind of of furniture manufacturing machine, and kind is more, is used in a large number; Apex point of protrusion in the middle of mostly existing gang drill structure is; Apex point extends two conical surfaces to external symmetry, and itself and helical flute form the end sword, form cutter hub between the adjacent helical flute.The apex point of this structure does not have cutting edge, and resistance is big during cutting, locatees inaccurately, bores partially easily, can not play a protective role to the hole; Only come chip removal through helical flute, the chip removal poor effect influences the hole surface roughness, makes its inwall rough, even burr occurs, has influenced crudy.

Summary of the invention

The objective of the invention is to overcome the shortcoming of prior art, provide a kind of rational in infrastructure, chip removal is effective, can improve four groove gang drills of hole surface roughness.

The object of the invention is realized through following technical scheme: four groove gang drills, and it is made up of the cutting portion and the shank that connect successively, and cutting portion is provided with two helical flutes; Part between the helical flute forms cutter hub; Locating tip of protrusion in the middle of the front end of cutting portion, locating tip is surrounded by four oblique locating surfaces, four prismatic one-tenth location swords that oblique locating surface intersects; Locating tip is to two the downward steep inclined-planes that are provided with of external symmetry; The bottom land of inclined-plane and helical flute has formed the end sword, and the outer peripheral face of this end sword and cutting portion has formed two outside points, on said cutter hub, is provided with the auxilliary chip area of spiral.

The outer peripheral face of described shank is provided with one plane.

The present invention has the following advantages:

1, cutter hub of the present invention is provided with the auxilliary chip area of spiral, has increased the chip removal space, and chip removal is effective, and the existence of the auxilliary chip area of spiral also increased the effective area of cut of cutter hub, has improved the quality of finished surface, has increased service life.

2, locating tip of the present invention is surrounded by four oblique locating surfaces, and the prismatics that four oblique locating surfaces intersect become the location swords, and the existence of location sword makes accurate positioning, prevents to bore the generation of inclined to one side phenomenon.

3, shank of the present invention is provided with the plane of being convenient to assemble, conveniently assemble and disassemble.

Description of drawings

Fig. 1 structural representation of the present invention

Fig. 2 left TV structure sketch map of the present invention

Fig. 3 right TV structure sketch map of the present invention

Among the figure, the 1-cutting portion, the 2-shank, the 3-helical flute, the 4-cutter hub, the 5-locating tip, the oblique locating surface of 6-, 7-locatees sword, the 8-inclined-plane, 9-holds sword, 10-outside point, the 11-spiral is assisted chip area, 12-plane, 13-groove.

The specific embodiment

Below in conjunction with accompanying drawing the present invention is done further description:

Like Fig. 1, Fig. 2, shown in Figure 3, four groove gang drills, it is made up of cutting portion that connects successively 1 and shank 2; Cutting portion 1 is provided with two helical flutes 3, and the part between the helical flute 3 forms cutter hub 4, locating tip 5 of protrusion in the middle of the front end of cutting portion 1; Locating tip 5 is surrounded by four oblique locating surfaces 6, four prismatic one-tenth location swords 7 that oblique locating surface 6 intersects, and locating tip 5 is to two the downward steep inclined-planes 8 that are provided with of external symmetry; Inclined-plane 8 has formed end sword 9 with the bottom land of helical flute 3; This end sword 9 has formed two outside points 10 with the outer peripheral face of cutting portion 1, on said cutter hub 4, is provided with the auxilliary chip area 11 of spiral, and the outer peripheral face of shank 2 is provided with one plane 12; Shank 2 ends are provided with a groove 13, are provided with flat recess in the groove 13.

The course of work of the present invention is following: add man-hour, at first accurately located by locating tip 5, location sword 7, outside point 10, carry out drilling by end sword 9, cutter hub 4 successively again; Simultaneously; Cutting swarf is discharged through the auxilliary chip area 11 of helical flute 3 and spiral, and chip removal is unobstructed, and the area of cut is big, the cutting edge wearing and tearing are low; Improved the durability of drill bit, and machined surface quality is high.

Claims

1. four groove gang drills; It is characterized in that: it is made up of cutting portion (1) that connects successively and shank (2); Cutting portion (1) is provided with two helical flutes (3), and the part between the helical flute (3) forms cutter hub (4), a protrusion locating tip (5) in the middle of the front end of cutting portion (1); Locating tip (5) is surrounded by four oblique locating surfaces (6); The prismatic that four oblique locating surfaces (6) intersect becomes location sword (7), and locating tip (5) is provided with two downward steep inclined-planes (8) to external symmetry, and inclined-plane (8) have formed end sword (9) with the bottom land of helical flute (3); This end sword (9) has formed two outside points (10) with the outer peripheral face of cutting portion (1), on said cutter hub (4), is provided with the auxilliary chip area (11) of spiral.

2. four groove gang drills according to claim 1 is characterized in that: the outer peripheral face of described shank (2) is provided with one plane (12).