CN103894639A

CN103894639A - Ultrasonic vibration turning tool bar clamping device

Info

Publication number: CN103894639A
Application number: CN201410147868.4A
Authority: CN
Inventors: 张明; 孙凯; 王榕婷; 毛蜀平
Original assignee: Qingdao University of Science and Technology
Current assignee: Qingdao University of Science and Technology
Priority date: 2014-04-14
Filing date: 2014-04-14
Publication date: 2014-07-02

Abstract

The invention provides a device used for clamping an ultrasonic vibration turning tool bar. The device is provided with a tool rest body, a square through groove is formed in the tool rest body, and a tool bar with the two sides provided with chutes can be placed in the square through groove. The solid bodies on the two sides of the square through groove of the tool rest body are respectively provided with two adjusting grooves and one sliding groove, four ball head pressing bolts penetrate through the four adjusting grooves respectively to be connected with four square nuts through threads, and the four square nuts are respectively placed in the two sliding grooves with every two as a set. The heads of the ball head pressing bolts are spherical and can be pressed into the chutes in the two sides of the tool bar through the square nuts respectively. Threads are arranged at the lower end of an ultrasonic vibration system, and the ultrasonic vibration system is fixed to the tool bar through nuts. The ultrasonic vibration turning tool bar clamping device avoids that when the tool bar is clamped vertically, the pressing bolts limit the rotating motion generated when the cross sections where pressing points on the tool bar are located perform bending vibration along with the tool bar and compensates for motion of clamping points caused by inaccurate calculation or change of the positions of wave nodes, and the ultrasonic vibration turning tool bar clamping device has the advantages of being compact in structure, easy and convenient to operate and the like.

Description

A kind of ultrasonic vibration turning knife bar clamping device

Technical field

The present invention relates to turning processing, relate to more specifically a kind of knife bar clamping device of ultrasonic vibration turning.

Background technology

Ultrasonic vibration turning processing has good technological effect, compared with common turning processing, its surface quality is high, tool life extends, cutting force is little, be suitable for the part that requirement on machining accuracy and surface quality are had relatively high expectations, especially the part and the large material of plasticity that are applicable to the low rigidity of processing, be also well suited for machining screw.

Be one type that commonly uses with the ultrasonic vibration turning device of flexural vibrations knife bar, the range of work is large, and convenient operation person observes process.

Ultrasonic vibration turning device with flexural vibrations knife bar is made up of supersonic generator, transducer, ultrasonic transformer, flexural vibrations knife bar and clamping device.The alternating current that supersonic generator is 50Hz by frequency converts superaudible oscillating current to, transducer converts oscillating current to supersonic frequency mechanical oscillation, ultrasonic transformer is by the Amplitude amplification of the extensional vibration from transducer input, and pass to flexural vibrations knife bar, make the lathe tool that is positioned at cutter head position carry out supersonic frequency vibration along cutting direction of primary motion.

The high-frequency mechanical vibration being occurred by ultrasonic transducer passes to knife bar, will cause that knife bar antinode place is along moving back and forth perpendicular to the vertical of knife bar axis, and the crankmotion of nodal point cross section generation certain angle; In the knife bar mounting and clamping system of existing ultrasonic vibration turning, cutter bar clamping point is positioned at the upper and lower surface of knife bar, and therefore clamping force will limit the rotation in cross section, thereby affects knife bar vibration and turning process.

Therefore design a kind of new type ultrasonic vibration turning knife bar clamping device and be necessary, be conducive to promote development and the popularization of supersonic vibration cutting.

Summary of the invention

The object of the invention is for the deficiencies in the prior art, a kind of ultrasonic vibration turning knife bar clamping device is provided, in the time that knife bar is carried out to clamping, avoid bolt clamping place on knife bar to follow knife bar flexural vibrations and the restriction rotatablely moving that occurs, compensation is because node position calculation is inaccurate or the motion at the clamping point place that variation causes as far as possible.According to the design feature of engine lathe and operating feature, can replace the knife rest on engine lathe, be directly installed on the little slide carriage of engine lathe, complete the processing of part, have compact conformation, easy and simple to handle, be easy to the features such as adjustment, good stability, cost be low.

In order to solve the problems of the technologies described above, the present invention adopts following technical proposals: ultrasonic vibration turning knife bar clamping device, is mainly made up of knife bar, tool-post structure, ultrasonic vibration system, four square nuts and four bulb hold-down bolts.

The little slide carriage bolt-connection of described tool-post structure and lathe; Described tool-post structure from left to right (see figure 3) is processed with square three-way groove, is processed with the knife bar of chute for placing both sides, and tool-post structure square three-way groove both sides are respectively processed with in a sliding tray and two each sliding trays of regulating tank and lay two square nuts.

Described four hold-down bolts respectively through four regulating tanks of tool-post structure square three-way groove both sides and respectively with four square nut spiral marking connections, four square nuts are positioned over respectively in the sliding tray of tool-post structure square three-way groove both sides; The head of four hold-down bolts is processed into ball shape, can be pressed to respectively in the chute of knife bar both sides by square nut, and circular arc is processed in chute bottom; The head of four hold-down bolts also can be processed into cone shape, and triangle is processed in the chute matching with it bottom.The threaded rod of described ultrasonic vibration system lower end connects with nut thread through the knife bar hole on knife bar, is fixed on knife bar.

Knife bar is in the time bending vibration, the amplitude of node place up-down vibration is zero, but corner amplitude is maximum place on whole knife bar, the amplitude along knife bar axis direction at knife bar upper and lower surface place is herein also maximum, in the time clamping knife bar up and down, hold-down bolt has limited the vibration along knife bar axis direction that steps up a place, and the flexural vibrations of knife bar are caused to adverse effect.

Employing the invention has the beneficial effects as follows: clamp knife bar from the centre position in cross section, node place, knife bar side, and the spherical or conical head of hold-down bolt contacts with circular arc or the triangular base of chute, make the frictional force of the small relative motion between the two less, can avoid fishbolt to follow flexural vibrations to knife bar and the restriction of the axial vibration of rotatablely moving of occurring and knife bar node place upper and lower surface, make whole cutter vibration of bar more stable, adjustment is more prone to.Compensation is because node position calculation is inaccurate or the motion at the clamping point place that variation causes; There is compact conformation, the feature such as easy and simple to handle.

Brief description of the drawings

Fig. 1 is the front view of ultrasonic vibration turning knife bar clamping device of the present invention;

Fig. 2 is the A-A cutaway view of Fig. 1;

Fig. 3 is the B-B cutaway view of Fig. 1;

Fig. 4 is knife bar front view.

In figure: knife bar 1, bulb hold-down bolt 1, regulating tank 1, tool-post structure 4, amplitude curve 5, ultrasonic vibration system 6, regulating tank 27, bulb hold-down bolt 28, square nut 1, node 1, square nut 3 11, bulb hold-down bolt 3 12, regulating tank 3 13, sliding tray 2 14, regulating tank 4 15, bulb hold-down bolt 4 16, square nut 4 17, node 2 18, square nut 2 19, sliding tray 1, chute 1, chute 2 22, square three-way groove 23.

Detailed description of the invention

With reference to figure 1, Fig. 2, Fig. 3 and Fig. 4, on described tool-post structure 4 base plates, be processed with four circular holes, can use bolt to pass these holes tool-post structure 4 is fastened on the little slide carriage of lathe.On tool-post structure 4, there is square three-way groove 23, knife bar 1 is placed in square three-way groove 23, square nut 1 and square nut 2 19 are installed in sliding tray 1, and before not fastening with bulb hold-down bolt, square nut 1 and square nut 2 19 can be in the interior movements of sliding tray 1.Square nut 3 11 and square nut 4 17 are installed in sliding tray 2 14, and before not fastening with bulb hold-down bolt, square nut 3 11 and square nut 4 17 can be in the interior movements of sliding tray 2 14.

Described bulb hold-down bolt 1 is through regulating tank 1 and square nut one 9 thread connection, bulb hold-down bolt 3 12 is through regulating tank 3 13 and square nut 3 11 thread connection, bulb hold-down bolt 1 and bulb hold-down bolt 3 12 are pressed on respectively from the both sides subtend of knife bar 1 in the chute 1 and chute 2 22 of the mark node 1 on knife bar 1, the bottom of chute 1 and chute 2 22 is circular arc, and its radius equates with the radius of bulb hold-down bolt 1 and bulb hold-down bolt 3 12 head bulbs.If the head of bulb hold-down bolt 1 and bulb hold-down bolt 3 12 is processed into cone shape, triangle is processed in chute 1 and chute 2 22 bottoms, and leg-of-mutton drift angle equates with the drift angle of the head circular cone of bulb hold-down bolt 1 and bulb hold-down bolt 3 12.

Described bulb hold-down bolt 28 is through regulating tank 27 and square nut 2 19 thread connection, bulb hold-down bolt 4 16 is through regulating tank 4 15 and square nut 4 17 thread connection, bulb hold-down bolt 28 and bulb hold-down bolt 4 16 are pressed on respectively from the both sides subtend of knife bar 1 in the chute 1 and chute 2 22 of the mark node 2 18 on knife bar 1, and the radius of bulb hold-down bolt 28 and bulb hold-down bolt 4 16 head bulbs equates with the radius of chute 1 and chute 2 22 bottom circular arcs.If triangle is processed in chute 1 and chute 2 22 bottoms, the head of bulb hold-down bolt 28 and bulb hold-down bolt 4 16 is processed into cone shape, and the drift angle of circular cone equates with the drift angle of chute bottom triangle.

With reference to figure 3 and Fig. 4, described chute 1 and chute 2 22 are all processed in the centre position of knife bar 1 two sides vertical, and the axis of length direction and knife bar 1 in the same way.

The threaded rod of described ultrasonic vibration system 6 lower ends connects with nut thread through the knife bar hole on knife bar, is fixed on knife bar.

When described device busy state, ultrasonic vibration system 6 produces supersonic frequency mechanical oscillation along axis direction, the vibration that bends of excitation knife bar 1, and distribution of amplitudes is as shown in amplitude curve 5.The position that bulb hold-down bolt 1 and bulb hold-down bolt 3 12 compress knife bar is preset in the chute 1 and chute 2 22 in node one 10 cross sections, place, and the position that bulb hold-down bolt 28 and bulb hold-down bolt 4 16 compress knife bar is preset in the chute 1 and chute 2 22 in node 2 18 cross sections, place.In the time that actual vibration nodal point position is moved, the position of four bulb hold-down bolts also can be adjusted thereupon.

Claims

1. a ultrasonic vibration turning knife bar clamping device, comprise: knife bar, tool-post structure, ultrasonic vibration system, four square nuts and four bulb hold-down bolts, it is characterized in that: four bulb hold-down bolts are respectively by four square nuts, be relatively pressed to the chute of knife bar between two from the two sides of knife bar, thus at two nodal point places of knife bar, from knife bar both sides by cutter bar clamping; The application of force direction of four bulb hold-down bolt clamping knife bars is perpendicular to knife bar flexural vibrations place plane.

2. ultrasonic vibration turning knife bar clamping device according to claim 1, it is characterized in that, on the centre position of described knife bar two sides vertical, be processed with respectively chute along knife bar axis direction, chute length is greater than the half wavelength of knife bar flexural vibrations, and chute bottom section is shaped as circular shape.

3. ultrasonic vibration turning knife bar clamping device according to claim 1, is characterized in that, the end that bulb hold-down bolt contacts with knife bar is semi-spherical shape.

4. ultrasonic vibration turning knife bar clamping device according to claim 1, is characterized in that, the end that bulb hold-down bolt contacts with knife bar also can be cone shape, and the chute bottom section shape on knife bar with matching should be triangle.

5. ultrasonic vibration turning knife bar clamping device according to claim 1, is characterized in that, square nut profile is square, and centre is processed with screwed hole, can be placed in the sliding tray of tool-post structure.

6. ultrasonic vibration turning knife bar clamping device according to claim 1, is characterized in that, is respectively processed with respectively two regulating tanks and a sliding tray on square three-way groove two side entities of described tool-post structure.