CN106984992B

CN106984992B - Spindle nose holding system and numerical control machining center

Info

Publication number: CN106984992B
Application number: CN201710358461.XA
Authority: CN
Inventors: 赵占歧
Original assignee: Beijing Drive Precision Machinery Co ltd
Current assignee: Beijing Drive Precision Machinery Co ltd
Priority date: 2017-05-19
Filing date: 2017-05-19
Publication date: 2023-05-12
Anticipated expiration: 2037-05-19
Also published as: CN106984992A

Abstract

The invention provides a main shaft nose enclasping system and a numerical control machining center, belongs to the technical field of machining, and aims to provide the main shaft nose enclasping system, and the numerical control machining center provided with the enclasping system can realize milling and turning of parts only by clamping once. The main shaft nose end enclasping system of the invention comprises: a spindle front cover and a piston; the main shaft front cover is provided with a piston hole, wherein the inner end of the piston hole extends to the inner annular surface of the main shaft front cover, and the outer end of the piston hole is used for communicating with high-pressure fluid; when the spindle front cover is fixed on the spindle front outer sleeve and high-pressure fluid is injected into the piston hole, the piston can slide along the axial direction of the piston hole until the inner end of the piston hole extends out of the inner ring surface of the spindle front cover and is pressed on the spindle of the spindle. The nose end of the main shaft of the numerical control machining center is provided with the main shaft nose end enclasping system.

Description

Spindle nose holding system and numerical control machining center

Technical Field

The invention relates to the technical field of machining, in particular to the technical field of finish machining.

Background

The existing fine parts (such as a mobile phone backboard) are usually processed through a plurality of working procedures. The existing part machining procedures requiring high-speed milling and turning again are as follows: firstly clamping a part on a milling machine tool for milling, and then clamping the part on a turning machine tool for turning, namely, in order to finish two working procedures of milling and turning, the two working procedures must be clamped twice by the existing machining technology, so that the time is long, the machining precision is lost, and the equipment occupation is increased.

Disclosure of Invention

The invention aims to solve the technical problem of providing a main shaft nose clamping system, and a numerical control machining center provided with the clamping system can realize milling and turning of parts only by clamping once.

The invention relates to a main shaft nose end enclasping system, which is characterized by comprising: a spindle front cover and a piston;

the main shaft front cover is provided with a piston hole, wherein the inner end of the piston hole extends to the inner annular surface of the main shaft front cover, and the outer end of the piston hole is used for communicating with high-pressure fluid;

when the spindle front cover is fixed on the spindle front outer sleeve and high-pressure fluid is injected into the piston hole, the piston can slide along the axial direction of the piston hole until the inner end of the piston hole extends out of the inner ring surface of the spindle front cover and is pressed on the spindle of the spindle.

Preferably, the inner end surface of the piston is arc-shaped and is matched with the outer circle of the mandrel.

Preferably, the device further comprises a reset elastic piece; one end of the reset elastic piece is connected with the front cover of the main shaft, and the other end of the reset elastic piece is connected with the piston; when the injection of the high-pressure fluid into the piston hole is stopped, the piston can slide along the axial direction of the piston hole to be separated from the mandrel at the inner end of the piston hole under the action of the reset elastic piece.

Preferably, the method further comprises: a set screw; the main shaft front cover is also provided with a positioning screw hole which is coaxially communicated with the piston hole, and the diameter of the positioning screw hole is not smaller than that of the piston hole; the positioning screw is screwed in the positioning screw hole.

Preferably, the piston is circumferentially fixed relative to the piston bore.

Preferably, the cross section of the piston hole is elliptical; the piston has at least a partial cross-section in the shape of an ellipse that corresponds to the cross-section of the piston bore.

Preferably, the number of the piston holes is a plurality, the plurality of the piston holes are arranged at different positions of the spindle front cover, and one piston is correspondingly assembled in each piston hole.

Preferably, a plurality of the piston holes are arranged in an annular array with the axis of the spindle front cover as an axis at equal angles.

Preferably, the piston hole is disposed along a radial direction of the spindle front cover.

The main shaft nose holding system provided by the invention is used for being arranged at the nose of a main shaft of a numerical control machining center, the numerical control machining center provided with the high-pressure holding system is used for machining parts, and when milling is needed, a milling cutter is directly arranged on the main shaft so as to mill the parts; when turning is needed, a turning tool is arranged on the main shaft, and high-pressure fluid is injected into the piston hole, so that the piston slides along the axial direction of the piston hole until the inner end of the piston extends out of the inner ring surface of the front cover of the main shaft and is pressed on the mandrel of the main shaft, namely, the mandrel is fixed relative to the main shaft at the moment, so that the turning tool has enough rigidity to support the turning of the part, and the expected turning effect is achieved.

The invention further provides a numerical control machining center, and the nose end of the main shaft of the machining center is provided with any one of the main shaft nose end enclasping systems. The effects which can be achieved are as described in the above paragraphs.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.

FIG. 1 is a half cross-sectional view of a spindle with a spindle nose hugging system according to an embodiment of the present invention installed;

fig. 2 is a partial enlarged view at P in bitmap 1.

Reference numerals:

1-main shaft nose end enclasping system

11-spindle front cover

111-piston bore

112-positioning screw hole

12-piston

13-set screw

2-spindle

21-mandrel

Detailed Description

Embodiments of the technical scheme of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and thus are merely examples, and are not intended to limit the scope of the present invention.

As shown in fig. 1-2, a main shaft nose holding system 1 according to an embodiment of the present invention includes: a spindle front cover 11 and a piston 12; the spindle front cover 11 has a piston hole 111, wherein an inner end of the piston hole 111 extends to an inner annular surface of the spindle front cover 11, and an outer end of the piston hole 111 is used for communicating with high-pressure fluid; when the spindle front cover 11 is fixed to the nose of the spindle 2 and high-pressure fluid is injected into the piston hole 111, the piston 12 can slide in the axial direction of the piston hole 111 until its inner end protrudes beyond the inner annular surface of the spindle front cover 11 and is pressed against the spindle 21 of the spindle 2.

The main shaft nose holding system 1 provided by the invention is used for being arranged at the nose of a main shaft 2 of a numerical control machining center, a numerical control machining center provided with a high-pressure holding system is used for machining parts, and when milling is needed, a milling cutter is directly arranged on the main shaft 2 so as to mill the parts; when turning is required, a turning tool is mounted on the spindle 2, and high-pressure fluid is injected into the piston hole 111, so that the piston 12 slides along the axial direction of the piston hole 111 until the inner end of the piston 12 extends out of the inner annular surface of the spindle front cover 11 and is pressed on the mandrel 21 of the spindle 2, namely, the mandrel 21 is fixed relative to the spindle 2 at the moment, so that the turning tool has enough rigidity to support turning of a part and achieve the expected turning effect.

In order to further improve the compression degree of the piston 12 on the mandrel 21 of the spindle 2, in the embodiment of the invention, the end face of the inner end of the piston 12 is arc-shaped and is adapted to the outer circle of the mandrel 21, so that the inner end of the piston 12 faces the mandrel 21 in an enveloping manner, the contact surface of the inner end and the mandrel is increased, that is, the friction force for preventing the mandrel 21 from rotating is increased, and the purpose of compressing the mandrel 21 is achieved.

When the turning of the part is completed, it is often necessary to reset the piston 12 for the subsequent milling operation. Based on this consideration, embodiments of the present invention also include a return spring; one end of the reset elastic piece is connected with the front cover 11 of the main shaft, and the other end is connected with the piston 12; when the injection of the high-pressure fluid into the piston hole 111 is stopped, the piston 12 can slide in the axial direction of the piston hole 111 to the point where its inner end is separated from the spindle 21 by the return elastic member. Specifically, the elastic piece can be a spring, an elastic sheet and other elastic devices,

further, the embodiment of the invention further comprises: a set screw 13; the spindle front cover 11 is also provided with a positioning screw hole 112, the positioning screw hole 112 is coaxially communicated with the piston hole 111, and the diameter of the positioning screw hole 112 is not smaller than the diameter of the piston hole 111; the set screw 13 is screwed into the set screw hole 112. The screw holes are provided mainly for the purpose of facilitating the mounting or dismounting of the piston 12, and when the piston 12 needs to be dismounted, the positioning screw 13 is dismounted first, and then the piston 12 can be taken out through the positioning screw holes 112.

If the inner end of the piston 12 rotates while pressing the spindle 21, damage to the surface of the spindle 21 is likely, and in order to avoid this problem, the piston 12 in the embodiment of the present invention is fixed circumferentially with respect to the piston hole 111. In order to achieve circumferential fixation of the piston 12, the cross section of the piston 12 may be specifically designed as a non-revolving body, for example, the cross section of the piston hole 111 is elliptical; the piston 12 has at least partially an oval cross-section that corresponds to the cross-section of the piston bore 111.

In order to more firmly block the rotation of the spindle 21, the number of the piston holes 111 is plural in the embodiment of the present invention, and the plural piston holes 111 are disposed at different positions of the spindle front cover 11, and each piston hole 111 is correspondingly provided with one piston 12. I.e. a plurality of pressing forces can be applied to the mandrel 21 at the same time, and in particular, a plurality of piston holes 111 are most effective in an annular array with equal angles with the axis of the spindle front cover 11 as the axis.

Preferably, the piston hole 111 is provided along a radial direction of the spindle front cover 11. In this way, the axial force applied by the high-pressure fluid to the piston 12 can be used to apply the entire axial force to the mandrel 21, thereby improving the utilization of the force applied by the high-pressure fluid.

According to the numerical control machining center provided by the other embodiment of the invention, the nose end of the spindle 2 of the machining center is provided with any one of the spindle nose end enclasping systems 1. The effects are as described above and will not be described in detail herein. It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is two or more unless specifically defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the description of the present invention, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.

Claims

1. The utility model provides a system is held tightly to main shaft nose, its nose that is used for installing the main shaft at numerical control machining center uses the numerical control machining center who installs high pressure system of holding tightly to process spare part, its characterized in that includes: the device comprises a main shaft front cover, a piston, a reset elastic piece and a positioning screw;

when the main shaft front cover is fixed on the main shaft front outer sleeve and high-pressure fluid is injected into the piston hole, the piston can slide along the axial direction of the piston hole until the inner end of the piston extends out of the inner ring surface of the main shaft front cover and is pressed on the mandrel of the main shaft;

the inner end face of the piston is arc-shaped and is matched with the outer circle of the mandrel;

one end of the reset elastic piece is connected with the front cover of the main shaft, and the other end of the reset elastic piece is connected with the piston; when the injection of the high-pressure fluid into the piston hole is stopped, the piston can slide along the axial direction of the piston hole under the action of the reset elastic piece until the inner end of the piston is separated from the mandrel;

the main shaft front cover is also provided with a positioning screw hole which is coaxially communicated with the piston hole, and the diameter of the positioning screw hole is not smaller than that of the piston hole; the positioning screw is screwed in the positioning screw hole;

when milling is needed, the milling cutter is directly arranged on the main shaft, so that the milling of the parts can be implemented; when turning is needed, a turning tool is arranged on the main shaft, and high-pressure fluid is injected into the piston hole, so that the piston slides along the axial direction of the piston hole until the inner end of the piston extends out of the inner ring surface of the front cover of the main shaft and is pressed on the mandrel of the main shaft, namely, the mandrel is fixed relative to the main shaft at the moment, and therefore, the turning tool has enough rigidity to support the turning of parts.

2. The spindle nose hugging system of claim 1, wherein the piston is circumferentially fixed relative to the piston bore.

3. The spindle nose hugging system of claim 2, wherein a cross section of said piston bore is elliptical; the piston has at least a partial cross-section in the shape of an ellipse that corresponds to the cross-section of the piston bore.

4. The spindle nose hugging system of claim 2, wherein the number of said piston bores is a plurality, and wherein a plurality of said piston bores are provided at different locations of said spindle nose cap, one of said pistons being disposed within each of said piston bores.

5. The spindle nose hugging system of claim 4, wherein a plurality of said piston bores are equiangular annular arrays about an axis of said spindle nose cap.

6. The spindle nose hugging system of claim 1, wherein the piston bore is disposed radially of the spindle nose cap.

7. A numerical control machining center, characterized in that a nose end of a spindle is provided with the spindle nose end enclasping system according to any one of claims 1 to 6.