CN1086473A

CN1086473A - Cutting tool breakup preventor

Info

Publication number: CN1086473A
Application number: CN 92112873
Authority: CN
Inventors: 吴庆隆
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-11-02
Filing date: 1992-11-02
Publication date: 1994-05-11

Abstract

A kind of cutting tool breakup preventor is provided with a front holder seat and a back holder with clamping one lathe tool on the tool holder of a lathe; This front holder seat has a breach for inserting lathe tool, and it just is up and down two fixture blocks, wherein has big thickness and is articulated in the knife rest side with a pivot with first fixture block, and both can relatively rotate, and the second fixture block thickness is less, and its surface attaches and is provided with a thin slice strain gauge; This back holder cover is sandwiched in the lathe tool rear end, welds in addition on it and is provided with a priming plate; This knife rest is provided with at least one electromagnet and a spring in order to spur this priming plate, when lathe tool is stressed when surpassing assumed load, strain gauge deflection on this second fixture block increases, more then can handle this electromagnet through detecting its strain signal amplification ratio, make the lathe tool blade leave surface of the work by the rapid arc displacement in turning position.

Description

Cutting tool breakup preventor

The present invention relates to machined into, be meant a kind of cutting tool breakup preventor especially.

The cutting tool that lathe uses abbreviates lathe tool usually as; the lathe tool of existing various lathe all is directly to be locked on the lathe tool seat with screw; utilize knife edge part to contact and carry out turning with workpiece; if the depth of cut is improper or workpiece material is uneven; cause lathe tool stressed too big; lathe tool bending or fracture situation then often take place; but; all be to rely on artificial range estimation and experience to control and avoid the lathe tool cutting stressed too big and impaired at present, still do not have the device of when the stressed overload of lathe tool, being protected and be developed application.Particularly the improper and fracture situation of lathe tool feed then often takes place in lathe training institution, lathe check unit, CNC lathe test run unit etc., a large amount of lathe tools of loss not only, and more may injure parts and influence its precision.

Main purpose of the present invention is to provide a kind of cutting tool breakup preventor; in order in that lathe tool is stressed when surpassing preset range; be able to rapid immediate response and make lathe tool leave surface of the work, and stop the lathe running, to prevent the safety of lathe tool fracture, protection personnel, lathe tool and parts.

Another object of the present invention is to provide a kind of cutting tool breakup preventor, it is simple in structure, installs easily, can be applicable to that general lathe and CNC lathe use.

So, cutting tool breakup preventor of the present invention is to be provided with a front holder seat and a back holder in order to the rear and front end of clamping one lathe tool respectively on the tool holder of lathe, wherein this front holder seat is to be installed on the pivot, can rotate neatly, make the lathe tool blade one suitable eccentric distance be arranged and can turn round arc and quicken move, and this front holder seat surface is pasted with a strain gauge (Strain gage) with respect to this pivot; This back holder then is provided with an iron plate in addition and is provided with an electromagnet with respect to the knife rest on this iron plate surface, can switch on and this iron plate of sticking makes the back tool rest be positioned at primary importance (normal turning position), when lathe tool is stressed, it is the little distortion of strain gauge that forces this front holder seat and surface thereof, when its deflection greater than when setting value, its signal that detects interrupts the power supply of this electromagnet and lathe motor through amplification, this back holder is subjected to a spring or cooperates the application of force of another electromagnet energising, make it be offset to the second place rapidly, then the lathe tool sword is that the off-axis cadion-acceleration is made arc and turned round outward and leave surface of the work with this pivot, then can avoid lathe tool because of the stressed excessive situation of damaging fracture.

About detailed construction of the present invention, function and characteristics, can be able to abundant understanding by the detailed description of the following embodiment of enumerating conjunction with figs..

Fig. 1 is the exploded perspective view of cutting tool breakup preventor;

Fig. 2 is the combination stereogram of Fig. 1 cutting tool breakup preventor;

Fig. 3 is the use situation schematic diagram of Fig. 1.

As shown in Figure 1, 2, it is the cutting tool breakup preventor that the present invention is applied to traditional lathe, including a knife rest 12 is with metallic plate block welding or sealed composition, has a pedestal 121 and one end and up extends a support 122, and these support 122 tops are provided with a frame plate 123; One front holder seat 14 is block elements that a cross section probably is the C type, and be divided on one fixture block 142 and fixture block 143 once with breach 141, wherein to have a pivot 144 be to be installed in the bearing 124 of these pedestal 121 sides in this time fixture block 143 sides, and this front holder seat 14 can be rotated flexibly with respect to this pedestal 121; One laminar strain pin 15 is to be attached at fixture block 142 end faces on this, a lathe tool 16 be installed in this breach 141 and by a screw 145 of below from lower to upper packing fix; One back holder 18 is to be provided with a priming plate 182 by back fixture block 181 sides weldering to be constituted, and these back fixture block 181 central authorities are penetrated with a through hole 183 cutter 16 of can buying car in installments and penetrate, again by a screw 185 sealed fixing; This priming plate 182 is irony plates, attracted by magneticaction; One electromagnet 21 is to be installed in these frame plate 123 bottom surfaces up to attach electromagnet 21 in order to attract this priming plate 182, makes lathe tool 16 be positioned at normal cutting use location; One spring 22 and a subsidiary magnet 22 are positioned at this priming plate 182 belows, and be downward in order to this priming plate 182 of drawing, and then the downward beat in lathe tool rear end and its preceding terminal knife edge will speed up skew and leave workpiece.

Above-mentioned this lathe tool 16 is attached at fixture block 142 bottom surfaces on this by screw 145 packings, should go up fixture block 142 thickness is to allow suitable strain in strength range, therefore when lathe tool turning stressed when excessive, to make fixture block 142 stress deformations, then this strain gauge 15 also changes its resistance value thereupon being out of shape, detect amplification ratio via control circuit, when its strain value greater than when setting value, can handle 21,23 actions of this electromagnet or be failure to actuate, situation is used in relevant action of the present invention, cooperates Fig. 3 to be described as follows:

During normal the cutting: electromagnet 21 is switched on and is adsorbed this priming plate 182, make back holder 18 be positioned at the top dead-centre precalculated position, lathe tool 16 is subjected to forward and backward holder 14,18 clampings and remains in the horizontal cutting position, therefore blade 161 can be made normal machining to workpiece 25, and is identical with habitual lathe tool machining.

During the lathe tool overload: too many or workpiece is too hard when lathe tool 16 feeds; then lathe tool 16 up urges fixture block 142 deflections increase on this; make the strain gauge that attaches on it 15 increase its internal impedance thereupon being out of shape; its internal impedance value is converted to voltage through a control circuit and detects amplification ratio; when greater than setting value; then immediately interrupt the power supply of electromagnet 21 and lathe motor and make subsidiary magnet 23 conductings and cooperate this priming plate 182 of spring 22 drawings downward; should 14 of preceding fixture blocks be the axle center revolution with pivot 144; lathe tool blade 161 is up reached leave workpiece 25 surface and stop turning processing, reach the protection lathe tool and avoid its stressed excessive and distortion fracture toward the outer arcuate beat.Certainly, the fiducial value of this strain gauge deflection is to adjust, to be applicable to the processing of different lathe tools and workpiece.

Lathe tool 16 blades of the foregoing description are turning modes down, certainly, the present invention also can be applicable to lathe tool blade cutting way up, frame plate 123 and electromagnet 21 need only be located at this priming plate 182 belows, gets final product and subsidiary magnet 23 and drawing spring 22 are located at priming plate 182 tops.Certainly, this spring 22 also can be the compression spring and is positioned at the same side of electromagnet 21, and if this spring 22 is made amount of power when enough, then can omit this subsidiary magnet 23.

In addition, cutting tool breakup preventor shown in the foregoing description accompanying drawing is the frame mode that cooperates traditional lathe, and actual loading test already confirms to have good effect.As for the cutting tool breakup preventor that is applied to the CNC lathe is car to be sent out the equivalence of frame do modify promptly applicable.Therefore, according to the described equivalent implementer of following claims, should be considered as the present patent application claim generally.

Claims

1, a kind of cutting tool breakup preventor, be included in a front holder seat and back holder two individual components are housed on the tool holder, this front holder seat has the breach that the cutter of buying car in installments is packed into and locked, that is these breach both sides form two fixture blocks, the first fixture block side wherein is articulated in the knife rest side with a pivot, and both can be relative to rotating flexibly; And the second fixture block inner surface reclines mutually with lathe tool and its outer surface attaches and is provided with a strain gauge; This back holder has the hole that the cutter rear end of buying car in installments is inserted and locked, and its rear end is provided with a suitably big or small priming plate in addition; At least be provided with an electromagnet and a spring in order to handle this priming plate displacement with respect to this priming Board position on this knife rest; When the stressed overload of this lathe tool, strain gauge deflection on this front holder seat increases, its detecting signal through amplification ratio, to control the power supply of this electromagnet, make the priming plate move to the second place by primary importance, and the lathe tool blade to be arc quicken to move away surface of the work.

2, cutting tool breakup preventor as claimed in claim 1 is characterized in that: the breach of this front holder seat and this pivot are for eccentric, and making lathe tool permanent is relative eccentric position with this revolution pivot.

3, cutting tool breakup preventor as claimed in claim 1; it is characterized in that: respectively be provided with an electromagnet on the knife rest of these priming plate both sides; wherein an electromagnet in order to this priming plate of sticking in primary importance; make lathe tool be positioned at normal cutting state; another subsidiary magnet be when the outage of last electromagnet, just switch on and this priming plate of sticking to the second place, make the lathe tool sword leave surface of the work.