CN108500708B

CN108500708B - Worm wheel feeding device

Info

Publication number: CN108500708B
Application number: CN201810170789.3A
Authority: CN
Inventors: 吴凤和; 孙银旭; 高志
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 2018-03-01
Filing date: 2018-03-01
Publication date: 2020-05-29
Anticipated expiration: 2038-03-01
Also published as: CN108500708A

Abstract

A worm gear feeding device comprises three sliding rods, a notch disc, a guide rail disc, a worm gear and a worm; the notch disc is embedded in the circular ring of the worm wheel and is in interference fit with the worm wheel; three arc-shaped notches are uniformly distributed on the front end face of the notch disc, and the central contour lines of the arc-shaped notches are Archimedes spiral lines; three grooves are radially formed on the end surface of the guide rail disc, which faces away from the guide rail disc; one side of the sliding rod is provided with a boss, and the middle part of the other side of the sliding rod is provided with a cylindrical convex part; the three sliding rods are respectively embedded in the three grooves of the guide rail disc; the back end surface of the guide rail disc is in profile fit and concentric fit with the front end surface of the notch disc, and the cylindrical convex parts in the middle of the other sides of the three sliding rods are respectively arranged in the three arc-shaped notches on the front end surface of the notch disc and can freely move along the arc-shaped notches; the worm wheel is meshed with the worm, and the ratio of the rotation angle of the worm to the feeding distance of the slide bar is a fixed constant under the action of the Archimedes spiral line. The invention can reduce the influence of radial force on the size of the part when the slender rod is machined.

Description

Worm wheel feeding device

Technical Field

The invention relates to a tool rest feeding device of a common lathe, in particular to a worm wheel feeding device.

Background

The tool rest of the lathe used at present is driven by a small lead screw through a fixed tool rest and a base, and feeding is realized through manual or motorized rotation. Therefore, when a slender rod is machined at present, a central hole is drilled in the rod, and the tail seat tip is used for propping against the rod to increase the rigidity of the rod.

Disclosure of Invention

The invention provides a worm gear feeding device. The technical problem to be solved is as follows: firstly, errors caused by radial force in the machining process are reduced; secondly, the device has higher precision and uniform scale; thirdly, the self-locking of the device is realized.

In order to solve the technical problems, the invention is realized by the following technical scheme:

a worm gear feeding device comprises three sliding rods, a notch disc, a guide rail disc, a worm gear and a worm; the notch disc is embedded in a circular ring of the worm wheel and is in interference fit with the worm wheel, a plurality of threaded holes are arranged along the contact circumference and are fastened and connected by screws, and a shaft neck at the rear end of the notch disc extends out of the rear end face of the worm wheel; three arc-shaped notches are uniformly distributed on the front end surface of the notch disc from the circumferential direction to the center direction, and the central contour line of each arc-shaped notch is an Archimedes spiral line; three grooves are radially formed in the end face, back to the guide rail disc, of the guide rail disc, the same sides of the three grooves are coincided with the diameter of the guide rail disc, and the included angle of the extension lines of the two adjacent sides is 120 degrees; one side of the sliding rod is provided with a boss, and the middle part of the other side of the sliding rod is provided with a cylindrical convex part; the three sliding rods are respectively embedded in the three grooves of the guide rail disc; the back end surface of the guide rail disc and the front end surface of the notch disc are in surface-to-surface contact to form profile matching and concentric matching, the cylindrical convex parts in the middle of the other sides of the three sliding rods are respectively arranged in the three arc-shaped notches on the front end surface of the notch disc, and the cylindrical convex parts of the sliding rods can freely move along the arc-shaped notches of the notch disc; the worm wheel is meshed with the worm, and the ratio of the rotation angle of the worm to the feeding distance of the slide bar is a fixed constant under the action of the Archimedes spiral line.

In the invention, three slide bars are adopted to respectively clamp three cutters and cut parts at the same time, thus reducing the machining error caused by cutter back-off phenomenon caused by elastic deformation of the parts due to unilateral radial force in the machining process; under the combined constraint action of the notch disc and the guide rail disc, the rotation of the worm wheel is changed into the linear motion of the three sliding rods; in order to make the scale of the dial uniform, namely the ratio of the rotation angle of the worm to the feed stroke of the slide bar is constant, the contour line of the notch disc adopts an Archimedes spiral line; due to the adoption of worm gear transmission, the worm gear transmission ratio is higher, so that the feeding precision is high, and the self-locking function of the device can be realized.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:

the feeding scale is uniform and the feeding precision is high; the influence of radial force on the size of a part during machining of the slender rod can be reduced; the device can be self-locked.

Drawings

FIG. 1 is an isometric view of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a rear view of the present invention;

FIG. 4 is a left side view of the present invention;

FIG. 5 is a partial cross-sectional view of the present invention;

fig. 6 is an exploded view of the present invention.

Detailed Description

To facilitate understanding by those skilled in the art, the present invention will be further described with reference to the following drawings and specific examples:

the invention discloses a worm gear feeding device, which comprises three sliding rods 1, a notch disc 2, a guide rail disc 3, a worm gear 4 and a worm 5, wherein the three sliding rods are arranged on the notch disc 2; as shown in fig. 3-4, the notch disc 2 is embedded in the circular ring of the worm wheel 4 and is in interference fit with the worm wheel 4, a plurality of threaded holes are arranged along the contact circumference, and the threaded holes are fastened and connected by screws 6 to prevent the worm wheel 4 and the notch disc 2 from generating relative axial and radial displacement; a shaft neck 10 at the rear end of the notch disc 2 extends out of the rear end face of the worm wheel 4, and the shaft neck is indirectly connected with external equipment through a bearing; as shown in fig. 5 to 6, three arc-shaped notches 8 are uniformly distributed on the front end surface of the notch disc 2 from the circumferential direction to the center direction, and the central contour line of each arc-shaped notch 8 is an archimedes spiral line; as shown in fig. 1, 2 and 6, three grooves 9 are radially formed on the end surface of the guide rail disc 3 facing away from the guide rail disc, the same sides of the three grooves 9 are all overlapped with the diameter of the guide rail disc 3, and the included angles of the extension lines of two adjacent sides are all 120 degrees; as shown in fig. 6, one side of the sliding rod 1 is a boss, and the middle part of the other side is provided with a cylindrical convex part 7; as shown in fig. 1, 5 and 6, three sliding rods 1 are respectively embedded in three grooves 9 of a guide rail disc 3; the back end surface of the guide rail disc 3 and the front end surface of the notch disc 2 form profile matching and concentric matching through surface-to-surface contact, and when the guide rail disc is connected with external equipment, the relative position is fixed, and the matching mode is similar to a tapered roller bearing; the cylindrical convex parts 7 at the middle parts of the other sides of the three slide bars 1 are respectively arranged in three arc-shaped notches 8 on the front end surface of the notch disc 2, and the cylindrical convex parts 7 of the slide bars 1 can freely move along the arc-shaped notches 9 of the notch disc 2; as shown in figures 1-5, the worm wheel 4 is meshed with the worm 5, and the ratio of the rotation angle of the worm 5 to the feed distance of the slide bar 4 is a fixed constant under the action of the Archimedes spiral.

When the guide rail disc fixing device is used, the other end face of the guide rail disc 3 is provided with a cylindrical boss positioning surface shown in fig. 4 for positioning with external equipment, and because the guide rail disc 3 is static in the working process, three planes shown in fig. 2 are arranged as clamping surfaces, the included angle of extension lines of two adjacent clamping surfaces is 60 degrees, the external equipment clamps the planes, and further the guide rail disc 3 is fixed. When feeding, through anticlockwise rotation worm 5, drive worm wheel 4 and rotate, and then notch dish 2 is rotatory, and the boss and the notch interact production motion of three slide bar 1, and guide rail dish 3 is static to produce the restraint to the direction of motion of three slide bar 1, lead to three slide bar 1 to be radial feed motion simultaneously, reach the feed rate, stop rotatory worm 5, and realize current position auto-lock automatically. When withdrawing the cutter, through clockwise rotation worm 5, drive worm wheel 4 and rotate, and then notch dish 2 counter rotation, the boss and the notch interact production motion of slide bar 1, because guide rail dish 3 is static to slide bar 1 production restraint, work piece is kept away from simultaneously to three slide bar 1, realizes withdrawing the cutter. In the whole range of the feeding device, under the characteristic action of the Archimedes spiral line of the notch disc 2, the ratio of the rotating angle of the worm 5 to the feeding distance of the slide rod 1 is a fixed constant, so that the uniform scale of the dial is realized, and the convenient operation of the feeding device is realized.

Claims

1. A worm gear feed, characterized by: the feeding device comprises three sliding rods, a notch disc, a guide rail disc, a worm wheel and a worm; the notch disc is embedded in a circular ring of the worm wheel and is in interference fit with the worm wheel, a plurality of threaded holes are arranged along the contact circumference and are fastened and connected by screws, and a shaft neck at the rear end of the notch disc extends out of the rear end face of the worm wheel; three arc-shaped notches are uniformly distributed on the front end surface of the notch disc from the circumferential direction to the center direction, and the central contour line of each arc-shaped notch is an Archimedes spiral line; three grooves are radially formed in the end face, back to the guide rail disc, of the guide rail disc, the same sides of the three grooves are coincided with the diameter of the guide rail disc, and the included angle of the extension lines of the two adjacent sides is 120 degrees; one side of the sliding rod is provided with a boss, and the middle part of the other side of the sliding rod is provided with a cylindrical convex part; the three sliding rods are respectively embedded in the three grooves of the guide rail disc; the back end surface of the guide rail disc and the front end surface of the notch disc are in surface-to-surface contact to form profile matching and concentric matching, the cylindrical convex parts in the middle of the other sides of the three sliding rods are respectively arranged in the three arc-shaped notches on the front end surface of the notch disc, and the cylindrical convex parts of the sliding rods can freely move along the arc-shaped notches of the notch disc; the worm wheel is meshed with the worm, and the ratio of the rotation angle of the worm to the feeding distance of the slide bar is a fixed constant under the action of the Archimedes spiral line; the device adopts three slide bars which are evenly distributed to clamp three cutters respectively, and the feeding device is used for cutting the slender rod.