CN1118296A

CN1118296A - Mechemic process for screw tap

Info

Publication number: CN1118296A
Application number: CN 94108663
Authority: CN
Inventors: 吕文富
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-09-05
Filing date: 1994-09-05
Publication date: 1996-03-13

Abstract

The method for machining screw tap with staggered teeth on reformed screw machine-tool features that after a tooth is ground the screw tap is axially shifted one time for alternatively grinding the tooth left and right.

Description

A kind of machining process of staggered-tooth tap

The present invention relates to a kind of machining process of new processing staggered-tooth tap, this processing method is applicable to that through on the regular screw threads machining tool after the simple refit No. one time staggered-tooth tap is processed into the regular tap relief grinding in the clamping location.

By retrieval and market survey, at present there is not to process specially the equipment of staggered-tooth tap, can only utilize screw grinder to process, its processing method is with regular tap every a sword lobe relief grinding once, for sword lobe number is the screw tap of odd number, and each relief grinding is to two side edges of teeth groove relief grindings simultaneously, and is the screw tap of even number for sword lobe number, the unidirectional side edge of then each each tooth of relief grinding, the side edge of different directions will carry out twice relief grinding and just can machine.

Existing processing method has the following disadvantages:

1, each staggered-tooth tap needs just can machine through twice relief grinding, since each tool setting difficulty, the general relief grinding that needs carry out respectively different side edges with two lathes, and production efficiency is lower.

2, staggered-tooth tap is not participated in cutting in actual use by the side edge of relief grinding, its machining accuracy need not too high, only need grind off suitable mill amount and get final product, waste real the genus so utilize this precision of screw grinder and expensive lathe to carry out the actual not high operation of machining accuracy that requires at present.

3, owing to use screw grinder, no matter the maintenance expense of machine tool expense or lathe is all higher, has increased the processing cost of product virtually.

Purpose of the present invention:

The regular tap no matter 1, even number sword lobe or odd number sword lobe are arranged only needs through going over relief grinding, and the one-time positioning clamping is processed continuously, just can be processed into staggered-tooth tap, enhances productivity one times.

2, this processing method need not to use accurate expensive screw grinder only to use the regular screw threads machining tool just can process staggered-tooth tap.

3, debugging and operation will make things convenient for.

Major technique content of the present invention is: the thread cutting machine that utilizes repacking, processed screw tap is clamped in does vertically in left and right displacement top, after the side edge of an a certain side of tooth of every relief grinding screw tap, the corresponding displacement that moves a setting to the left or to the right of processed screw tap, about the side edge not of the same name of processed each tooth of screw tap of relief grinding alternately, a clamping is finished the process of staggered-tooth tap, the half of thread angle of used emery wheel is chosen between 28 ° at 22 ° by the pitch of processed screw tap.

The present invention is achieved in that the additional top and control device of special-purpose reciprocating motion type on relieving lathe, with screw tap be clamped in top on, after dial drives the side edge of a certain side of the intact tooth of the every relief grinding of processed screw tap, when screw tap chip pocket position during with respect to emery wheel, and the position again corresponding contact of setting on the dial identical with screw tap groove number just laid a finger on an on-off type switch on the control system, electromagnet is worked, the pulling shift fork, shift fork makes sliding sleeve top before being equipped with together along the move to right displacement of a qualification of top axis direction, behind the intact next tooth of relief grinding, another contact can bump switch again on the dial, make the electromagnet outage, shift fork unclamps, processed screw tap oppositely moves immediately under the effect of tail centre spring force, be moved to the left the displacement of a qualification, as long as set up the position of the gag lever post of the position of each contact on the dial and shift fork, to the relevant position of good contact with respect to processed screw tap chip pocket, so successively in the process of each tooth of relief grinding screw tap, processed screw tap changes a position just can produce a side edge of the intact tooth of every relief grinding with respect to the position of emery wheel after, realize No. one time clamping, replace the side edge of the different flanks of relief grinding screw tap continuously, finish the processing of staggered-tooth tap.

The invention has the advantages that:

1, no matter the staggered-tooth tap of even number or odd number sword lobe all can machine by a clamping, has improved production efficiency.

2, can reduce the management maintenance expense of production equipment expense and production equipment with relieving lathe processing staggered-tooth tap.

3, the tailstock movable axis puts the contact block that amesdial is housed, and when tail top during with processed screw tap move left and right, can directly read the displacement of processed screw tap with amesdial, makes that tool setting is easy in the process also can monitor the processing situation at any time, the raising crudy.

4, the present invention takes the principle of processed screw tap axial left and right sides trade-off to process, and its attachment device is simple in structure easy to manufacture.As make the trade-off of the emery wheel left and right sides carry out relief grinding, then its complex structure, be difficult to realize.

5, the present invention also can be used for suitably other thread cutting machine of repacking except that being used for relieving lathe.

The present invention is 1.0 above screw taps for pitch, and the half of thread angle of its lathe emery wheel is chosen between 28 ° at 22 °.

Process principle schematic diagram when Fig. 1 processes staggered-tooth tap for the present invention;

Fig. 2 arranges schematic diagram along the order of processed screw tap lead angle direction relief grinding side edge.Wherein A represents by the mill side edge.

Provide embodiments of the invention as follows in conjunction with the accompanying drawings:

The present invention as shown in Figure 1, mainly by taper-shank arbor 1, sliding sleeve 2, bearing pin 3, end face bearing 4, dial 5, preceding top 6, tail centre 7, contact block 8, slide-bar 9, support 10, electromagnet 11, shift fork 12, switch 13, gag lever post 14, screw rod 15, contact 16, ring 17, amesdial 18 is formed, wherein, taper-shank arbor 1 is fixedly mounted in the tapered bore of machine tool spindle, sliding sleeve 2 is slidingly matched by feather key and taper-shank arbor 1, preceding top 6 are fixedly mounted in the taper hole of sliding sleeve 2, dial 5 is fixedly mounted on the sliding sleeve 2, end face bearing 4 is installed on the sliding sleeve 2, bearing pin 3 is fixedly mounted on the annulus 17 of two end face bearings, 4 centres, contact 16 is fixedly mounted on the dial 5, tail centre 7 is fixedly mounted in the taper hole of slide-bar 9, contact block 8 is fixed on the slide-bar 9, support 10 is fixedly mounted on the lathe bed surface, electromagnet 11 is fixedly mounted on the sidewall of support 10, shift fork 12 is contained between two sidewalls of support 10 by rotating shaft, but switch 13 is fixed on the sidewall of support 10 and keep position contacting with contact 16 on the dial 5, gag lever post 14 be connected by nut with screw rod 15 and also gag lever post 14 on spacing " V " type groove can adjust the position up and down.

Operation principle of the present invention is such: processed screw tap be clamped in before top 6 and tail centre 7 between, the slide-bar 9 that spring is housed makes tail centre 7 clamp processed screw tap and simultaneously pressure is pushed to preceding top 6, sliding sleeve 2 is moved to the left, utilize two end face bearings 4 to be clamped in ring 17 and sliding sleeve 2 on the sliding sleeve 2 for being rotatably assorted, be separated by 180 ° bearing pin 3 of two of fixed installations on the ring 17, bearing pin 3 is rotatably assorted with the pin-and-hole of shift fork 12 upper ends, sliding sleeve 2 is slidingly matched with taper-shank arbor 1 and is connected by feather key and sliding sleeve 2 and taper-shank arbor 1 can be rotated synchronously and can axially relatively move, when processed awl with preceding top 6 and tail centre 7 and sliding sleeve 2 at tailstock slide-bar 9 springs when being moved to the left, bearing pin 3 is swung shift fork 12 upper ends left, at this moment, electromagnet 11 no powers, the lower end of shift fork 12 " V " type piece is swung to the right and is close to the right of spacing " V " groove of gag lever post 14, the contact 16 of counting equal number with processed cutter blade is housed on the dial 5, the position of contact 16 is uniform and corresponding with the chip pocket position of processed screw tap, therefore, when processed screw tap in the process under taper-shank arbor 1 and dial 5 drives, revolution moves a week, when the relative screw tap of emery wheel is made pitch of axial displacement, behind the side edge of a screw tap tooth of every relief grinding, contact 16 is promptly touched switch 13 once, switch 13 on-offs, electromagnet 11 is just controlled shift fork 12, make correspondingly move left and right of sliding sleeve 2 and preceding top 6 generations and screw tap groove number, can one-time positioning replace the processing that relief grinding is finished staggered-tooth tap successively.Can regulate gag lever post 14 by screw rod 15 moves up and down, gap between " V " type head of control " V " type groove and shift fork 12 lower ends, thereby the oscillating quantity of control shift fork 12, after setting up the gap, screw tap left and right displacement value is just determined, adjustment process can be by being fixed on the contact block 8 contact amesdials 18 on the slide-bar 9, and the size of reading shift value easily is so that set up the gap width of control displacement.

The staggered-tooth tap of even number sword lobe or odd number sword lobe no matter, all available said method, No. one time clamping machines.

Claims

1, a kind of machining process of staggered-tooth tap, it is characterized in that: utilize the thread cutting machine of reequiping, processed regular tap is clamped in does vertically in left and right displacement top, after the side edge of an a certain side of tooth of every relief grinding screw tap, the corresponding displacement that moves a setting to the left or to the right of processed screw tap, about the side edge not of the same name of processed each tooth of screw tap of relief grinding alternately, a clamping is finished the process of staggered-tooth tap, and the half of thread angle of used emery wheel is chosen between 28 ° at 22 ° by the pitch of processed screw tap.