CN2041602U

CN2041602U - Clamping head

Info

Publication number: CN2041602U
Application number: CN 88217261
Authority: CN
Inventors: 孟宪岐
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-12-26
Filing date: 1988-12-26
Publication date: 1989-07-26

Abstract

The utility model discloses a clamping head which is used to the machine for fastening the rotary cutting tools such as drill heads, milling tools, reaming tools, etc., and the clamping head of the workpiece with the circular outer walls. The utility model is composed of a clamping head body (1), a clamping head cylinder (2), a rotary cylinder (3), a keeping cylinder (5), and a-shaped form needle roller (9). The utility model overcomes the inner resistance which is generated by the contraction of the clamping head cylinder of the past clamping head, enlarges the clamping force, eliminates the abrasions of the point contact where the needle roller is positioned, and improves the ability of the bearing torque. Besides, at the time of working, the radial jump is small, the acceptable force is uniform, and therefore, the surface accuracy of the workpiece processing is improved.

Description

Clamping head

Chuck described in the utility model is as machine tool accessories, is used for rotary cutting tools such as fastening drill bit, milling cutter, reamer, and circular and thin cylinder shape workpiece.

Present used chuck on machine tool, three-pawl type chuck normally, during use except that clamping force inadequately, also crush instrument or workpiece easily.

Chuck after the improvement is made up of clamper main body, chuck tube, revolving drum, maintenance tube, porcupine roller, on its chuck barrel, be provided with dark hole vertically, though the clamping degree of instrument (part) is improved, but because the tension force of its inner surface, still make and step up power and be subjected to certain limitation.Porcupine roller is one cylindrical in addition, and and clamper main body be installed at angle between chuck tube and the revolving drum, because the outer surface of chuck tube and the inner surface of revolving drum are respectively taper seat, so when screwing revolving drum, porcupine roller is that point type contacts with chuck tube and revolving drum, make porcupine roller wear and tear easily, be out of shape like this, chuck tube and revolving drum are worn too, thereby the use that influences chuck is received a mandate.

At above-mentioned shortcoming, the purpose of this utility model is a kind of chuck of design, makes it not only increase fastening force, and has reduced wearing and tearing.

The purpose of this utility model is achieved in that

Chuck by clamper main body, connects the chuck tube down, and the maintenance tube between outside revolving drum, chuck tube and the revolving drum, and the porcupine roller composition, be characterized in: on the inwall of chuck tube, offer the arcuate recess parallel, whole clamping forces are all dropped on the impost face with axis; Described porcupine roller is a diameter shaped form porcupine roller small in ends broad in the middle (outer surface that is porcupine roller is a surface of revolution); Clamper main body and chuck tube are in aggregates, and adopt side keyway to bear the moment of torsion that produces in the machining in the lower end of clamper main body.

The utility model has the advantages that: because the thickness of chuck tube increases to some extent, and adopted clamper main body to establish side keyway, improved the ability that chuck bears moment of torsion, overcome the vibration that is produced when instrument carries out high-rate cutting.Chuck tube and clamper main body adopt whole shape, when making processing work, are easy to obtain higher geometric accuracy, and circular runout is little, the centering precision height.The utility model adopts the shaped form porcupine roller, the point type contact that becomes former porcupine roller is the line contact, eliminate the partial points contact wear effectively, improved the bearing capacity of porcupine roller and the spiralling stability of revolving drum, also improved the service life of chuck tube, revolving drum and shaped form porcupine roller.Inner surface at chuck tube of the present utility model has made arch-type structure, according to mechanics principle, whole active forces can be applied on instrument or the workpiece by the impost face, when having overcome the contraction of chuck tube, resistance effect in the flow of metal of endoporus top layer, increased clamping force, and make the circular runout of instrument or workpiece little, stressed even, simultaneously, because the arcuate recess of chuck tube, things such as oil subsidiary on instrument or the workpiece or cutting metal can be scraped and stay in the arch groove, prevented effectively because instrument or workpiece have attached oil to skid when machining and fall cutter, and crushed lemel scratch instrument and chuck.

Accompanying drawing 1 partly cuts open figure for facing of chuck.Accompanying drawing 4 is a curve porcupine roller view.

Accompanying drawing 2 is the A-A profile of accompanying drawing 1.

Accompanying drawing 3 is the B-B profile of accompanying drawing 1.

Below in conjunction with accompanying drawing the utility model is elaborated:

There is a chuck tube (2) lower end of clamper main body (1), and chuck tube and clamper main body become one.The outer surface of chuck tube (2) is downward taper seat, and the inwall upper edge axis direction of chuck tube (2) can have arcuate recess (3), the position that the length of arcuate recess (3) contacts with porcupine roller greater than the chuck tube.It is the revolving drum (4) of taper seat that there is an inner surface chuck tube (2) outside, its internal conical surface parallels with the outer conical surface of chuck tube, between chuck tube (2) and revolving drum (3), have one to keep tube (5), keep the tube upper and lower part that one packing ring (6) is arranged, and snap in revolving drum (3) and chuck tube (2) respectively by upper and lower back-up ring (7), (8), make to keep unlikely the coming off of tube, and chuck tube and revolving drum can turn round loading and unloading.Be arranged with the shaped form porcupine roller (9) that diameter is (being that outer surface is a surface of revolution) small in ends broad in the middle in keeping tube (5), when shaped form porcupine roller (9) was installed, its axis and tapered auger revolution direction were orthogonal thereto.When the rotation revolving drum, make the shaped form porcupine roller carry out rotation and spiral revolution, revolving drum is risen or decline, thereby make the chuck tube shrink or recovery.

The lower surface of clamper main body (1) and chuck tube (2) joint can have side keyway (10), during use instrument or workpiece pommel are inserted keyway, and moment of torsion is acted directly on the clamper main body.

Claims

1, a kind of lathe that is used for, rotary cutting tool such as fastening drill bit, milling cutter, reamer and outer wall are the chuck of circular workpiece, by the chuck tube (2) of clamper main body (1), bottom and the revolving drum (3) of chuck tube outside, and maintenance tube (5) between chuck tube and the revolving drum and porcupine roller composition, it is characterized in that: described porcupine roller is that diameter is the shaped form porcupine roller (9) of (being that outer surface is a surface of revolution) small in the end and big in the middle; On the inwall of described chuck tube (2), be provided with arcuate recess (3) vertically; Described clamper main body (1) is an one with chuck tube (2).

2, chuck according to claim 1 is characterized in that: there is a side keyway (10) lower end and chuck tube (2) joint at clamper main body (1).