CN85202477U

CN85202477U - Screw tap-machining device

Info

Publication number: CN85202477U
Application number: CN 85202477
Authority: CN
Inventors: 黄金保
Original assignee: Shanghai Bicycle Factory No3
Current assignee: Shanghai Bicycle Factory No3
Priority date: 1985-05-17
Filing date: 1985-05-17
Publication date: 1986-08-20

Abstract

The utility model relates to a device for processing a screw tap. The utility model belongs to special equipment for grinding a thread. A grinding head is arranged on a pull plate of a cutter frame of an ordinary lathe. The device for processing a screw tap is arranged on the outer wall of a geared head. An intermittent drive mechanism which is composed of an incomplete gear 16, a duplicate gear 7 and a mandrel gear 9, and an instant positioning mechanism which is composed of a steel ball 6, a spring 5, a support head screw 4 and a spring sleeve 3 lead a tap 12 which is processed to periodically and intermittently move. When the tap does not rotate, through the axial movement of a grinding wheel 18 in a chip flute of the tap, the purpose of flute hopping grinding is obtained. The pulsed vibration caused by the reciprocating movement of a frame of the grinding wheel when a screw tap is processed by a thread grinder is overcome.

Description

Screw tap-machining device

The utility model belongs to the special equipment of thread grinding.

As everyone knows, the large scale internal thread that Material Processing toughness is bigger adopts interrupted thread tap mostly.Its jumping tooth grinding is comparatively complicated, and common practices is with screw grinder and cam mechanism.Rely on the laterally reciprocal feed motion of emery wheel to shape.Existing problems are that the grinding carriage type frequently reciprocating can cause the pulse vibrations, have limited the raising of process velocity.

" tool technique " 78 years the 5th interim Soviet Union Wal Ren Siji automobile factorys of having introduced have developed the device of the multi-thread wheel grinding interrupted thread tap of a cover under the help of Tuoli Yang Si base engineering institute, be used for improving processing throughput.But the multi-thread formed grinding wheel polishing of this device is difficulty relatively, and still needs screw grinder and cam mechanism.

The task that the utility model solved is to adopt the Daepori bed that is open to traffic, and handles through repacking, reduction of speed, and bistrique of device has been installed a kind of device of processing interrupted thread tap on the tool rest carriage on the geared head outer wall, reaches the purpose of jumping the tooth grinding.

Effect of the present utility model is to have solved the vibrations of grinding carriage reciprocating impulse, has improved the rotating speed of workpiece, has broken through the conventional art of interrupted thread tap with screw grinder processing.

Its advantage be simple in structure, work efficiency obviously, quality assurance.

The utility model is realized by following design: emery wheel depth fully teeth height is carried out screw tap and is ground off tooth processing.When emery wheel enters the screw tap chip pocket, certain interval is still arranged each other, if do not withdraw from emery wheel, emery wheel is moved axially, can not break profile of tooth yet.But can be greater than this reality of screw tap fully teeth height according to the depth degree of emery wheel in the screw tap chip pocket.By a partial gear that is installed on the headstock main shaft, the duplicate gear on the fixed axis in headstock main shaft the place ahead and headstock is top and tailstock center between the axle gear, the intermittent drive mechanism of composition makes processed screw tap be cyclical intermission motion.Emery wheel carries out cutting processing when screw tap rotates, and during the screw tap stall by between duplicate gear and the fixed axis one moment fixed mechanism fix screw tap, emery wheel placed in the screw tap chip pocket.Emery wheel moves axially a tooth pitch in the screw tap chip pocket under machine tool dragging plate drives, realized the motion of jumping tooth, has finished and has once jumped the tooth order, goes round and begins again to have reached the purpose of jumping the tooth grinding.

Marginal data:

Fig. 1 is an elevation cross-sectional view of the present utility model.

Fig. 2 is that A shown in Figure 1 is to view.

Fig. 3 is a B-B revolved sectional view shown in Figure 1.

Now describe a most preferred embodiment of the present utility model in conjunction with the accompanying drawings in detail: as shown in Figure 1, at lathe spindle 15 ends, the partial gear 16 that relied on spiral marking connection, its profile of tooth only processed for 1/2 week, and remaining is milled.On the geared head outer wall in headstock main shaft 15 the place aheads, fixed a fixed axis 2 that step is arranged with bolt 1.Empty cover duplicate gear 7 is housed on the fixed axis 2, and axle prevents its axial displacement with ring washer 8, and the middle part of duplicate gear 7 is equipped with a moment detent mechanism of being made up of steel ball 6, spring 5, branch head screw 4, spring housing 3.Be processed with a positioning pit on the relative position of fixed axis 2, processed screw tap 12 usefulness nuts 13 are fastened on the mandrel 10, and spindle gear 9 of the left end close-fitting of mandrel 10 joins together, places between headstock top 17 and the tailstock center 14.Nut 11 is to be used for moving back unloading workpiece.Emery wheel 18 is somes of bistrique, and whole bistrique is installed on the machine tool dragging plate, drive by change gear and screw mandrel by lathe, partial gear 16 when full tooth and the speed ratio of duplicate gear 7 be 2:1.Duplicate gear 7 is 1:1 with the speed ratio of spindle gear 9, and the lathe change gear is taken tooth pitch and got two times of screw tap pitch.

Rotate headstock, make partial gear 16 and duplicate gear 7 break away from engagement (shown in figure two), and make duplicate gear 7 moment detent mechanism spring 5 and the effect of steel ball 6 under be in positioning states, to adorn spindle gear 9, the mandrel 10 of workpiece this moment, place between headstock top 17 and the tailstock center 14 and with duplicate gear 7 and mesh, turning of work piece or meshing point make emery wheel place in the arbitrary chip pocket of screw tap and make emery wheel 18 depth greater than the screw tap tooth depth.(shown in figure three).

After the driving, partial gear 16 enters engagement with duplicate gear 7.Because the mutual engageable number of teeth equates, thus partial gear 16 when turning over for 1/2 week duplicate gear 7 turn over a week just, spindle gear 9 also turns over a week, has finished the profile grinding of gear of screw tap first tooth.At this moment emery wheel 18 restores with the relative position of screw tap chip pocket.(shown in figure three).Partial gear 16 breaks away from engagement again with duplicate gear 7, the steel ball 6 of detent mechanism embedded in the positioning pit on the fixed axis 2 and played the location moment, spindle gear 9, mandrel 10 are no longer rotated, guaranteed that emery wheel 18 places in the chip pocket of screw tap just.In 7 out-of-gear 1/2 weeks, the lathe screw mandrel drives the planker motion, laterally moves past a screw tap pitch at partial gear 16 and duplicate gear.Because bistrique places on the tool rest carriage, so emery wheel laterally moves past a screw tap pitch in chip pocket under the situation that screw tap does not rotate, and finished and once jumped tooth grinding order.Go round and begin again and just finished the processing tasks of jumping the tooth grinding.

Claims

1, a kind of device of processing interrupted thread tap, the special equipment that belongs to thread grinding, the mandrel 10 that it is characterized in that fastening workpiece, one end is fixed with spindle gear 9 and places between headstock top 17 and the tailstock center 14, the duplicate gear 7 that meshes with spindle gear is installed on the fixed axis 2, fixed axis 2 is installed on the geared head outer wall, headstock main shaft 15 has been formed an intermittent drive mechanism by partial gear 16 of spiral marking connection, also have between the middle part of duplicate gear 7 and the fixed axis 2 one moment fixed mechanism.

2, a kind of its feature of device of processing interrupted thread tap as claimed in claim 1 is that partial gear 16 only had gear in 1/2 week, and the speed ratio with duplicate gear 7 during its full tooth is 2:1, and the speed ratio of duplicate gear 7 and spindle gear 9 is 1:1.

3, a kind of device of processing interrupted thread tap as claimed in claim 1 is characterized in that the moment fixed mechanism between duplicate gear 7 and the fixed axis 2 is made up of steel ball 6, spring 5, branch head screw 4, spring housing 3.

4, a kind of device of processing interrupted thread tap as claimed in claim 3 is characterized in that a positioning pit is arranged on the fixed axis 2.

5, a kind of device of processing interrupted thread tap as claimed in claim 1 is characterized in that having one to move back removing nut 11 and clamp nut 13 on the mandrel 10 of fastening workpiece 12.