CN217343607U

CN217343607U - Thread anti-backlash structure of fine-tuning fine boring cutter

Info

Publication number: CN217343607U
Application number: CN202220891406.3U
Authority: CN
Inventors: 何建华; 胡洋
Original assignee: Centech Eg Co ltd
Current assignee: Centech Eg Co ltd
Priority date: 2022-04-18
Filing date: 2022-04-18
Publication date: 2022-09-02
Anticipated expiration: 2032-04-18

Abstract

The utility model relates to a screw thread crack structure that disappears of fine setting finish boring sword belongs to boring sword technical field. The utility model comprises a screw rod, a boring cutter body, a sliding shaft and a fine adjustment nut, wherein the sliding shaft can move along the axis direction of an inner hole of the boring cutter body, the sliding shaft is fixedly connected with the fine adjustment nut, the screw rod is in running fit with the boring cutter body, the screw rod and the fine adjustment nut form a screw nut transmission mechanism, an assembly blind hole is arranged on the sliding shaft, and the axis of the assembly blind hole is parallel to or coincided with the axis of the sliding shaft; the fine setting nut is connected with the inside wall fixed connection of assembly blind hole, and the screw rod passes the fine setting nut and stretches into the one end in the assembly blind hole and be connected with the clearance nut that disappears, and the rotation direction of clearance nut and fine setting nut is the same, and through keyway and spacing protruding combination formation clearance nut's rotation-preventing structure that disappears between the inside wall of clearance nut and assembly blind hole, the diapire of assembly blind hole and the terminal surface of clearance nut that disappears are provided with the spring that is in compression state all the time. The utility model discloses can effectively improve the fine setting precision of boring cutter.

Description

Thread anti-backlash structure of fine-tuning fine boring cutter

Technical Field

The utility model relates to a screw thread crack structure that disappears of fine setting finish boring sword belongs to boring sword technical field.

Background

Boring is one of important processes of high-precision machining, and when a high-precision workpiece is machined or repaired, the problems of difficult adjustment of a cutter, low efficiency and difficult guarantee of machining precision commonly exist. The fine adjustment boring cutter adopts a thread fine adjustment mechanism at most, and the adjustment precision of the fine adjustment boring cutter mainly depends on the thread pitch of the threads and the precision of the threads. The thread clearance always existing during thread matching also plays a key role in the adjustment precision, and the fine adjustment precision is influenced due to the phenomenon that the size is insensitive or the return stroke is inaccurate during adjustment of the thread clearance during use.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the thread anti-backlash structure of the fine-tuning fine boring cutter can effectively improve the fine-tuning precision of the boring cutter.

For solving the technical problem the utility model discloses the technical scheme who adopts is: the thread clearance eliminating structure of the fine tuning fine boring cutter comprises a screw, a boring cutter body, a sliding shaft and a fine tuning nut, wherein the sliding shaft is in clearance fit with an inner hole of the boring cutter body and can move along the axis direction of the inner hole of the boring cutter body; the sliding shaft is fixedly connected with the fine adjustment nut, the screw rod is in rotating fit with the boring cutter body, the screw rod and the fine adjustment nut form a screw rod nut transmission mechanism, the sliding shaft is provided with an assembly blind hole, and the axis of the assembly blind hole is parallel to or coincident with the axis of the sliding shaft; the fine setting nut is connected with the inside wall fixed connection of assembly blind hole, the screw rod passes the fine setting nut and stretches into the one end in the assembly blind hole and be connected with the clearance nut that disappears, the rotation direction of clearance nut and fine setting nut that disappears is the same, form the restriction clearance nut that disappears through keyway and spacing protruding combination between the inside wall of clearance nut and assembly blind hole and rotate but do not influence the clearance nut that disappears and follow the anti-rotation structure that assembly blind hole axial direction removed, be provided with the spring that is in compression state all the time between the diapire of assembly blind hole and the terminal surface of clearance nut that disappears.

Further, the method comprises the following steps: the anti-rotation structure comprises an anti-rotation screw arranged on the side wall of the assembly blind hole and a key groove arranged on the outer peripheral surface of the anti-backlash nut, and the tail end of the anti-rotation screw is used as a limiting bulge.

Further, the method comprises the following steps: the assembly blind hole is a stepped hole with a small inner end diameter and a large outer end diameter, and the fine adjustment nut is fixed with the inner side wall of the outer end of the assembly blind hole in an interference fit manner.

Further, the method comprises the following steps: the spring is a wave spring sleeved on the screw rod.

Further, the method comprises the following steps: the boring cutter is characterized by further comprising a positioning block and a compression nut, the compression nut and the screw are glued and screwed fixedly, the positioning block is fixed on the boring cutter body through a screw, the positioning block is provided with a through hole which is in running fit with the screw, one side end face of the through hole of the positioning block is in contact with the head of the screw, and the other side end face of the through hole of the positioning block is in contact with the end face of the compression nut.

The utility model has the advantages that: during implementation, the anti-rotation screw is located in the key groove of the anti-backlash nut, so that the anti-backlash nut cannot rotate, the anti-backlash nut can only move together with the fine adjustment nut and the sliding shaft when the screw rotates, and the spring is always in a compressed state. The utility model discloses when utilizing the screw rod to rotate, four part relative positions of slide-shaft, fine setting nut, crack nut, spring are motionless, and the elasticity of the spring that crack nut received all the time acts on the screw rod, makes the screw rod eliminate completely with the thread clearance of fine setting nut. The utility model discloses a screw thread anti-backlash structure does not occupy the regulation space of screw thread fine setting, and the effectual influence of eliminating the thread clearance to the fine setting precision completely even that reduces.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the stress state of the gap eliminating nut and the left thread of the screw rod.

Fig. 3 is a schematic view of the left side thread stress state of the fine adjustment nut and the screw rod of the present invention.

Parts in the figures are labeled: the boring cutter comprises a screw rod 1, a positioning block 2, a compression nut 3, a boring cutter body 4, a sliding shaft 5, a fine adjustment nut 6, an anti-rotation screw 7, a gap eliminating nut 8 and a spring 9.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

As shown in fig. 1, the utility model comprises a screw 1, a boring cutter body 4, a sliding shaft 5 and a fine adjustment nut 6, wherein the sliding shaft 5 is in clearance fit with the inner hole of the boring cutter body 4 and can move along the axis direction of the inner hole of the boring cutter body 4; the sliding shaft 5 is fixedly connected with the fine adjustment nut 6, the screw rod 1 is in running fit with the boring cutter body 4, the screw rod 1 and the fine adjustment nut 6 form a screw rod nut transmission mechanism, the sliding shaft 5 is provided with an assembly blind hole, and the axis of the assembly blind hole is parallel to or coincident with the axis of the sliding shaft 5; the fine tuning nut 6 is fixedly connected with the inner side wall of the assembly blind hole, one end of the screw rod 1, which penetrates through the fine tuning nut 6 and extends into the assembly blind hole, is connected with a gap eliminating nut 8, the rotating directions of the gap eliminating nut 8 and the fine tuning nut 6 are the same, an anti-rotating structure which limits the rotation of the gap eliminating nut 8 but does not influence the movement of the gap eliminating nut 8 along the axial direction of the assembly blind hole is formed between the gap eliminating nut 8 and the inner side wall of the assembly blind hole through the combination of a key groove and a limiting bulge, a spring 9 which is always in a compression state is arranged between the bottom wall of the assembly blind hole and the end face of the gap eliminating nut 8, the spring 9 can be directly sleeved on the screw rod 1 and can also be arranged around the screw rod 1 in a spaced distribution mode, the structure of the device is simplified, the structural reliability is effectively guaranteed, and the spring 9 is preferably a wave spring which is directly sleeved on the screw rod 1. The wave spring is a conventional part in the prior art, is an elastic element with a plurality of peaks and valleys on the metal thin circular ring, has the advantages of high strength, good flexibility, strong impact resistance and the like compared with a butterfly spring, and has compact structural size, and the required installation space is smaller under the condition of the same parameters.

The utility model discloses a theory of operation does: when the screw rod 1 rotates, the relative positions of the sliding shaft 5, the fine adjustment nut 6, the clearance eliminating nut 8 and the spring 9 are fixed, the whole body moves along the axis direction of the inner hole of the boring cutter body 4, the elastic force of the spring 9 always applied to the clearance eliminating nut 8 acts on the screw rod 1 (the stress state refers to fig. 2), and then the thread clearance between the screw rod 1 and the fine adjustment nut 8 is completely eliminated (the stress state refers to fig. 3). During assembly, the spring force applied by the spring 9 can be pre-adjusted according to the anti-backlash nut 8, the compression length of the spring 9 cannot be changed in the moving process of the sliding shaft 5, the applied spring force cannot be changed, the structural reliability in the working process can be ensured, the fine adjustment precision of the boring cutter can be effectively improved, and the machining precision of a product can be further improved.

For convenience of assembly, the assembly blind hole in the sliding shaft 5 is a stepped hole with a small inner end diameter and a large outer end diameter, and the fine adjustment nut 6 is fixed with the inner side wall of the outer end of the assembly blind hole in an interference fit mode.

It can be understood that, spacing arch among the anti-rotation structure can set up on the slide shaft 5, also can set up on the crack nut 8 that disappears, for processing and assembly, the utility model provides an anti-rotation structure is including setting up in the anti-rotation screw 7 of assembly blind hole lateral wall and setting up in the keyway of crack nut 8 outer peripheral face that disappears, by the tail end of preventing rotating screw 7 as spacing arch. During assembly, the spring 9 is in contact with the bottom surface of an assembly blind hole on the sliding shaft 5, the anti-backlash nut 8 is in clearance fit with the assembly blind hole on the sliding shaft 5, the anti-backlash nut 8 is in contact with and pressed against the spring 9, the anti-rotation screw 7 is in key fit with the anti-backlash nut 8, the anti-rotation screw 7 compresses the spring 9 and then locks the spring after the anti-backlash nut 8 compresses the spring 9, so that the spring 9 is always in a compressed state, the fine adjustment nut 6 is fixed with the sliding shaft 5 in an interference fit manner, and the thread size and the screwing direction of the fine adjustment nut 6 and the anti-backlash nut 8 are the same; then screw in 1, will prevent that screw 7 loosens 1/4 circles after fine setting nut 6, gap eliminating nut 8 all with screw 1 screw-thread fit, make gap eliminating nut 8 unsettled when with screw 1 screw-thread fit, prevent that screw 7 is located 8 keyways in the gap eliminating nut and make gap eliminating nut 8 unable rotations, thereby when screw 1 rotates, gap eliminating nut 8 only can remove together with fine setting nut 6 and sliding shaft 5, and spring 9 is in the compression state all the time.

It can be understood that, because the screw rod 1 and the fine adjustment nut 6 constitute a screw nut transmission mechanism, the screw rod 1 is rotatable for the boring cutter body 4, but can not follow axial displacement, consequently, need set up axial limit structure between screw rod 1 and the boring cutter body 4, the utility model provides a simple and easy reliable implementation mode, concrete structure is as follows: the utility model discloses still include locating piece 2 and gland nut 3, gland nut 3 closes fixedly with 1 screw thread rubber coating of screw rod soon, and locating piece 2 passes through the fix with screw on boring cutter body 4, and locating piece 2 has the through-hole that forms normal running fit with screw rod 1, and a side end face of locating piece 2 through-hole contacts with the head of screw rod 1, and the terminal surface of opposite side terminal surface and gland nut 3 contacts.

Claims

1. The thread clearance eliminating structure of the fine tuning fine boring cutter comprises a screw rod (1), a boring cutter body (4), a sliding shaft (5) and a fine tuning nut (6), wherein the sliding shaft (5) is in clearance fit with an inner hole of the boring cutter body (4) and can move along the axis direction of the inner hole of the boring cutter body (4); slide shaft (5) and fine setting nut (6) fixed connection, screw rod (1) and boring cutter body (4) normal running fit, screw rod (1) and fine setting nut (6) constitute lead screw nut drive mechanism, its characterized in that: the sliding shaft (5) is provided with a blind assembly hole, and the axis of the blind assembly hole is parallel to or coincident with the axis of the sliding shaft (5); fine setting nut (6) and the inside wall fixed connection who assembles the blind hole, screw rod (1) passes fine setting nut (6) and stretches into the one end in the assembly blind hole and is connected with gap eliminating nut (8), the rotation direction of gap eliminating nut (8) and fine setting nut (6) is the same, form the restriction through keyway and spacing protruding combination between gap eliminating nut (8) and the inside wall of assembly blind hole and disappear gap nut (8) and rotate but do not influence the anti-rotation structure that gap eliminating nut (8) removed along assembly blind hole axial direction, be provided with spring (9) that are in the compression state all the time between the diapire of assembly blind hole and the terminal surface of gap eliminating nut (8).

2. The thread backlash structure of the fine tuning fine boring cutter according to claim 1, wherein: the anti-rotation structure comprises an anti-rotation screw (7) arranged on the side wall of the assembly blind hole and a key groove arranged on the outer peripheral surface of the anti-backlash nut (8), and the tail end of the anti-rotation screw (7) is used as a limiting protrusion.

3. The thread backlash eliminating structure of the fine tuning fine boring cutter according to claim 1, wherein: the assembly blind hole is a stepped hole with a small inner end diameter and a large outer end diameter, and the fine adjustment nut (6) is fixed with the inner side wall of the outer end of the assembly blind hole in an interference fit manner.

4. The thread backlash structure of the fine tuning fine boring cutter according to claim 1, wherein: the spring (9) is a wave spring sleeved on the screw rod (1).

5. The thread backlash structure of the fine tuning fine boring cutter according to any one of claims 1 to 4, wherein: the boring cutter is characterized by further comprising a positioning block (2) and a compression nut (3), the compression nut (3) is fixedly screwed with the screw rod (1) in a threaded gluing mode, the positioning block (2) is fixed on the boring cutter body (4) through a screw, the positioning block (2) is provided with a through hole which is in running fit with the screw rod (1), one side end face of the through hole of the positioning block (2) is in contact with the head of the screw rod (1), and the other side end face of the through hole of the positioning block (2) is in contact with the end face of the compression nut (3).