CN104999103A

CN104999103A - Power chuck

Info

Publication number: CN104999103A
Application number: CN201510529748.5A
Authority: CN
Inventors: 朱应生; 朱婷婷
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-08-26
Filing date: 2015-08-26
Publication date: 2015-10-28

Abstract

The invention discloses a power chuck, comprising a pull rod, a chuck body, a slide base, T-shaped keys, a claw, a slide shaft and a locating key, wherein the chuck body is mounted on a turning center spindle, is located by a cylindrical surface of the rear part of the chuck body, and is locked by six screws, so that the chuck body and the spindle form a whole, a hexagonal head screw is connected with an air cylinder piston at the rear part of the spindle by one end of the pull rod, the chuck body and the slide base are located by the locating key and are fixedly connected, the slide shaft is fixedly arranged at the middle of the slide base, the other end of the pull rod is fixedly connected with the slide shaft, the claw is fixedly connected with the slide base by two T-shaped keys, and the claw is step-shaped. The power chuck is simple in structure and convenient to use, eliminates potential safety hazards caused by high speed rotation of the claw, greatly reduces safety accidents, and meanwhile prolongs the service lives of the claw and a whole machine tool.

Description

A kind of power chuck

Technical field

The invention belongs to lathe self-centering chuck field, particularly a kind of power chuck.

Background technology

Jig is a kind of high efficient technology equipment in machinery manufacturing industry, and be easy to ensure stable machining accuracy, reduce the labour intensity of workman, this is particularly important in batch production; Because clamping chuck workpiece has following advantages: a. stably can ensure the machining accuracy of workpiece; B. can raise labour productivity; C. the scope of application of lathe can be expanded; D. can reduce costs, chuck, in machined, particularly lathe is applied widely.

Along with the progress of science and technology and the development of production, each department of national economy requires the technical equipment that mechanical industry constantly provides advanced, develops new product variety, to meet the needs that national sustained economic development and people's lives improve constantly; Meanwhile, along with the development of cutter material and improving constantly of lathe rotating speed, more and more higher requirement be it is also proposed to chuck.

In modern numerically controlled lathe, power chuck is modal work piece apparatus, and it is the connecting interface between electrical spindle for machine tool and workpiece, and the rotating speed of electrical spindle for machine tool, moment of torsion and running accuracy pass to workpiece by power chuck; The workpiece of High Rotation Speed and clamping system thereof have huge kinergety, it is the main hazard source of high-speed turning process, jack catchs type chuck due to can gripping range wider and there is very high flexibility, therefore be widely used in the clamping of rotary work piece, but due to square being directly proportional of size and its rotating speed of the centrifugal force of claw, therefore when High Rotation Speed, clamping force sharply declines along with the increase of rotating speed, when effective clamping force is less than the minimum grip power needed for opposing cutting force, workpiece will be thrown out of and cause a serious accident.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of power chuck, reduces or avoids, in process of production because of the unstable security incident for bringing of chuck clamping, eliminating safe hidden trouble as far as possible.

For realizing above-mentioned technique effect, a kind of power chuck of the present invention, it comprises pull bar, chuck body, slide, T-shaped key, claw, slide-bar and positioning key, chuck body is arranged on the main shaft of turning center, locate with the face of cylinder at chuck body rear portion, by six screw lock, it is made to become to be integrated with main shaft, hex head screw is linked togather by the cylinder piston at pull bar one end and main shaft rear portion, described chuck body and slide are located by positioning key and are fixedly connected with, slide-bar is fixedly installed in the middle part of slide, the pull bar other end is fixedly connected with slide-bar, claw is fixedly connected with slide by two T-shaped keys, described claw is stairstepping, when High Rotation Speed made by chuck, square being directly proportional of the centrifugal force of chuck self and speed be inversely proportional to radius r, simultaneously, adopt staged claw, radius of turn r can be reduced, thus reach the effect reducing centrifugal force, thus avoid, in process of production because of the unstable security incident for bringing of chuck clamping, eliminating safe hidden trouble, when piston moves forward, slide-bar is also to reach, slide-bar drives the slide in chuck body radially-inwardly to move by skewed slot, and the claw connected together with slide also radially-inwardly moves thus clamping work pieces thereupon, when piston reverses direction moves, claw will radially outward move, thus unclamp workpiece.

Described a kind of power chuck also comprises adjusting pad, described adjusting pad is arranged on pull bar outside and is connected with slide-bar, when piston moves forward, slide-bar is also to reach, the moving range of slide-bar can be kept by the adjustment of adjusting pad, thus reach because of the specification of processing work, the difference of size and the object of claw clamping range can be adjusted.

Described a kind of power chuck also comprises dust cap and holding screw, and described dust cap is arranged on the inner side of the outside of slide-bar, claw, is fixedly connected with slide by holding screw.

Described slide-bar is back taper, it is round-corner transition between axial plane, in clamping process, slide-bar is axially to workpiece movable, the area that is now squeezed progressively increases, and reduces the stressed of contact unit, extends the service life of slide-bar and slide, the life-span of chuck also improves thereupon, axial dimension shortens and has some improvement to the stress condition of main shaft, thus the life-span of lathe and the precision of main shaft is improved, all favourable to raw material of keep the safety in production, improve the quality of products, save, saving power.

Described chuck materials is 40CrM04 steel, and heat treatment method is normalizing after employing roughing, and to there being the surface of relative motion and friction to carry out surface high frequency flame hardening again after semifinishing, hardness can reach HRC45 1.

Described claw material be carburizing steel or nitrated steel as 14NiCrl4, after heat treatment, case hardness can reach 55 ~ 58HRc, and core possesses very high pliability and intensity.

A kind of power chuck structure of the present invention is simple, easy to use, eliminates claw because of the potential safety hazard caused that runs up, significantly reduces the generation of security incident, also improve the service life of claw and lathe entirety simultaneously.

Accompanying drawing explanation

Fig. 1 is the main TV structure schematic diagram of a kind of power chuck proposed by the invention.

Fig. 2 is A-A cross-sectional schematic.

Fig. 3 is chuck structure schematic diagram.

Fig. 4 is slide-bar structural representation.

Detailed description of the invention

See accompanying drawing, a kind of power chuck, it comprises pull bar 1, chuck body 3, slide 4, T-shaped key 5, claw 6, slide-bar 8 and positioning key 10, chuck body is arranged on the main shaft of turning center, locate with the face of cylinder at chuck body rear portion, by six screw lock, it is made to become to be integrated with main shaft, hex head screw is linked togather by the cylinder piston at pull bar one end and main shaft rear portion, described chuck body and slide are located by positioning key and are fixedly connected with, slide-bar is fixedly installed in the middle part of slide, the pull bar other end is fixedly connected with slide-bar, claw is fixedly connected with slide by two T-shaped keys, described claw is stairstepping, when High Rotation Speed made by chuck, square being directly proportional of the centrifugal force of chuck self and speed be inversely proportional to radius r, simultaneously, adopt staged claw, radius of turn r can be reduced, thus reach the effect reducing centrifugal force, thus avoid, in process of production because of the unstable security incident for bringing of chuck clamping, eliminating safe hidden trouble, when piston moves forward, slide-bar is also to reach, slide-bar drives the slide in chuck body radially-inwardly to move by skewed slot, and the claw connected together with slide also radially-inwardly moves thus clamping work pieces thereupon, when piston reverses direction moves, claw will radially outward move, thus unclamp workpiece.

Described a kind of power chuck also comprises adjusting pad 2, described adjusting pad is arranged on pull bar outside and is connected with slide-bar, when piston moves forward, slide-bar is also to reach, the moving range of slide-bar can be kept by the adjustment of adjusting pad, thus reach because of the specification of processing work, the difference of size and the object of claw clamping range can be adjusted.

Described a kind of power chuck also comprises dust cap 7 and holding screw 9, and described dust cap is arranged on the inner side of the outside of slide-bar, claw, is fixedly connected with slide by holding screw.

Described chuck materials is 40CrM04 steel, and heat treatment method is normalizing after employing roughing, and to there being the surface of relative motion and friction to carry out surface high frequency flame hardening again after semifinishing, hardness can reach 45 ~ 55HRC.

Claims

1. a power chuck, it is characterized in that it comprises pull bar, chuck body, slide, T-shaped key, claw, slide-bar and positioning key, chuck body is arranged on the main shaft of turning center, locate with the face of cylinder at chuck body rear portion, by six screw lock, it is made to become to be integrated with main shaft, hex head screw is linked togather by the cylinder piston at pull bar one end and main shaft rear portion, it is characterized in that described chuck body and slide are located by positioning key and be fixedly connected with, slide-bar is fixedly installed in the middle part of slide, the pull bar other end is fixedly connected with slide-bar, claw is fixedly connected with slide by two T-shaped keys, described claw is stairstepping.

2. a kind of power chuck according to claim 1, is characterized in that it also comprises adjusting pad, and described adjusting pad is arranged on pull bar outside, is connected with slide-bar.

3. a kind of power chuck according to claim 1, is characterized in that it also comprises dust cap and holding screw, and described dust cap is arranged on the inner side of the outside of slide-bar, claw, is fixedly connected with slide by holding screw.

4. a kind of power chuck according to claim 1, is characterized in that described slide-bar is back taper, is round-corner transition between axial plane.

5. a kind of power chuck according to claim 1, is characterized in that described chuck materials is 40CrM04 steel.

6. a kind of power chuck according to claim 1, it is characterized in that described claw material be carburizing steel or nitrated steel as 14NiCrl4, after heat treatment, case hardness can reach 55 ~ 58HRc.