CN106378465A - Center - Google Patents

Abstract

A center is a machine tool accessory . The center is composed of a center rear cover A, a center base B, a bearing pedestal C and a work head D, the bearing pedestal and the center base B are provided with a bearing chamber used for mounting of a thrust bearing, the bearing pedestal C and the work head are connected together, and therefore when a workpiece rotates, the work table and the bearing pedestal jointly rotate, however, the center base B cannot rotate, and is provided with a cutter rod hole, and through the cutter rod hole, under the condition that the center works, machining of the outer circle and the center can be synchronously completed. Therefore, the machining precision of some irregular parts and thin-wall parts is ensured, and the product can meet the tolerance requirement of drawing paper.

Description

A kind of thimble

Technical field

The invention belongs to engineering goods, especially relate to a kind of machine tool accessories.

Background technology

In the course of processing of some flange type or disc-like mechanical workpieces, if workpiece to be processed is cast member, or Person is workpiece shape itself is not plane, and particularly pressing close to scroll chuck or chuck is not plane, but has certain Gradient, claw contact area is little, easily flies out during such work pieces process, and the power that accommodates is big, and workpiece is possible to deform, and processes The product concentricity come is very poor, or workpiece is thin-wall workpiece, and such work pieces process is difficult, and the power that accommodates is excessive, and workpiece holds Yielding, in addition workpiece can fragmentation, accommodate power too small, workpiece easily flies out, and to this kind of product, during general factory process is all Withstood with thimble, but, part workpiece needs machining center position, is withstood with thimble and also has any problem, and is all first during general processing Processing excircles, face on the basis of cylindrical, using boring machine boring endoporus, and the adjustment of boring machine is time consuming, and needs in addition Jig, also almost, one or two is very unrealistic using boring machine for high-volume processing, even with boring machine, before plus The deformation that during work, workpiece occurs is also impossible to concentricity is completely secured, through our detection, with 516 type horizontal motors Front and rear cover as a example, the maximum of its screens outside diameter and minima, average phase difference 0.07mm, extremely can reach individually 0.15mm, in addition, aluminum, zinc, coppersmith part, easily forms built-up-edge, viscous knife in the course of processing, this kind of workpiece material is soft, viscous during processing Property again big, be easily worked not as good as steel product on the contrary, this kind of workpiece there is also a blessing difficult problem.

Content of the invention

Technical characteristic, a kind of thimble, thimble is mainly by thimble bonnet A, thimble pedestal B, bearing block C, work head D and thrust Bearing forms, and it is characterized in that：Its structure is as follows,

1）, taper shank B1 its taper shank microcephaly have the corresponding screwed hole of A1 with thimble bonnet A, A1 section is screwed into the screw thread of taper shank microcephaly Hole；

2）, B5 and C2 position constitute bearing chamber, for installed thrust bearing, positioning screw 1 is screwed into positioning screw hole C3, positions spiral shell Rod aperture C3 position is corresponding with locating slot B4, prevents bearing block C from dropping from thimble pedestal B；

3）, fastening thread hole C1 and fastener hole D3 position be corresponding, head will be worked and bearing block is locked at by tie down screw 2 Together；

4）, convex annulus D2 and locating slot C4 be corresponding, C4 and D2 is to ensure that the concentricity of work head and bearing block；

5）, the position of forwardtransfer signal worm screwed hole D1, size, quantity be not to determine, when specifically used, process according to specific Product determines, accordingly, forwardtransfer signal worm 3 needs corresponding with DI；

6）, taper shank B1 taper identical with the taper hole taper in spindle taper hole or tailstock hole；

7）, have knife bar hole B3 on thimble pedestal B, the effect in knife bar hole is to put in knife bar, completes the processing of workpiece centre,

Thimble bonnet A is optional design, primarily to convenient dismounting bearing and perfusion lubricating oil, does not have both design needs When, thimble bonnet A can omit.

Brief description：Accompanying drawing 1 is thimble structure schematic diagram, and A is thimble bonnet, and B is thimble pedestal, and C is bearing block, and D is Work head, B1 is taper shank, and B2 is sky thorax body, and B3 is cutter holes, and 1 is positioning screw, and 2 is tie down screw, and 3 is forwardtransfer signal worm；

Accompanying drawing 2 is thimble structure schematic diagram, and A is thimble bonnet, and B is thimble pedestal, and C is bearing block, and D is work head, and B1 is cone Handle, B2 is sky thorax body, and B3 is cutter holes, and 1 is positioning screw, and 2 is tie down screw, and 3 is forwardtransfer signal worm, and 4 is thrust bearing；

The upper figure of accompanying drawing 3 is thimble pedestal schematic diagram, and figure below is thimble bonnet schematic diagram, and A1 is screw thread position, and A2 is arc position, and A3 is One word opening, B1 is taper shank, and B2 is sky thorax body, and B3 is knife bar hole, and B4 is locating slot, and B5 is bearing installation position；

Accompanying drawing 4 is bearing block positive and negative schematic diagram, and C1 is fastening thread hole, and C2 is bearing installation position, and C3 is positioning screw hole, C4 It is locating slot；

Accompanying drawing 5 is working head structure schematic diagram, and D1 is forwardtransfer signal worm screwed hole, and D2 is convex annulus, and D3 is fastener hole.

Specific embodiment：Applicant combines accompanying drawing and is explained：

The commonly thimble on tail stock in thimble, the thimble on tailstock is divided into live centre and dead center, and the present invention is alive One kind of thimble, thimble pedestal and bearing block are mounted with thrust bearing, and thimble pedestal can not rotate, and the forwardtransfer signal worm of workbench supports Clamping of workpieces, under the rotation of workpiece, work headband moving axis bearing rotates together, and forwardtransfer signal worm can be adjusted, so, even if to be added Work workpiece is irregular, also can push against, and due to being that claw accommodates, while being pushed against, workpiece would not fly out, and forwardtransfer signal worm Position in concrete operations, according to the processing request of product and shape rational deployment, for example, most of workpiece is not one Atresia, no protrude, no cave in, so, using this some holes, protruding or part of caving in does datum mark, can prevent workpiece and work Hairdo gives birth to relative movement, thin-walled parts, needs processing excircles and centre bearing seat simultaneously, now only needs to knife bar After hole position adjustment, cutter passes through knife bar hole, thus machining center bearing seat, so, the cylindrical and centre bearing of synchronous processing Seat, time processing puts in place, thereby may be ensured that machining accuracy.

Claims (1)

1. a kind of thimble, thimble is mainly made up of thimble bonnet A, thimble pedestal B, bearing block C, work head D and thrust bearing, its Feature is：Its structure is as follows,

1）, taper shank B1 its taper shank microcephaly have the corresponding screwed hole of A1 with thimble bonnet A, A1 section is screwed into the screw thread of taper shank microcephaly Hole；

2）, B5 and C2 position constitute bearing chamber, for installed thrust bearing, positioning screw 1 is screwed into positioning screw hole C3, positions spiral shell Rod aperture C3 position is corresponding with locating slot B4, prevents bearing block C from dropping from thimble pedestal B；

3）, fastening thread hole C1 and fastener hole D3 position be corresponding, head will be worked and bearing block is locked at by tie down screw 2 Together；

4）, convex annulus D2 and locating slot C4 be corresponding, C4 and D2 is to ensure that the concentricity of work head and bearing block；

5）, the position of forwardtransfer signal worm screwed hole D1, size, quantity be not to determine, when specifically used, process according to specific Product determines, accordingly, forwardtransfer signal worm 3 needs corresponding with DI；

6）, taper shank B1 taper identical with the taper hole taper in spindle taper hole or tailstock hole；

7）, have knife bar hole B3 on thimble pedestal B, the effect in knife bar hole is to put in knife bar, completes the processing of workpiece centre,

Thimble bonnet A is optional design, primarily to convenient dismounting bearing and perfusion lubricating oil, does not have both design needs When, thimble bonnet A can omit.