CN201389752Y

CN201389752Y - Locating core shaft

Info

Publication number: CN201389752Y
Application number: CN200920039238U
Authority: CN
Inventors: 吴双胜; 景留平
Original assignee: Wuxi Yinlian Machinery Co Ltd
Current assignee: Wuxi Yinlian Machinery Co Ltd
Priority date: 2009-04-28
Filing date: 2009-04-28
Publication date: 2010-01-27
Anticipated expiration: 2019-04-28

Abstract

The utility model relates to a locating core shaft which can realize double location of an inner hole and a datum plane when processing ring-like parts; a shaft head and a shaft shoulder are arranged on the core shaft, the shaft head is sheathed with a plurality of steel balls with retainers, the sum of the diameter of the shaft head and the two times of the diameter of single steel ball is more than or equal to the diameter of the inner hole of a workpiece. In the utility model, zero-clearance matching between the steel balls and the workpiece on the shaft head is adopted to locate the inner hole of the workpiece, and the shaft shoulder is adopted to locate the datum plane of the workpiece, so as to effectively and reliably locate the workpiece and greatly improve the stability of the processing quality.

Description

Positioning core axle

Technical field

The utility model relates to a kind of positioning core axle, can realize the positioning core axle of endoporus and the two location of datum level when relating in particular to the processing ring parts.

Background technology

At the processing ring parts, when needs endoporus and datum level location, and when the form and position tolerance at institute's processing place and place, location is higher, just must adopt reliable locate mode, when clamping, must guarantee 2 points: the one, center, requirement practical work piece hole and work table rotation center are in full accord; The 2nd, axial location unanimity, resetting state consistency.

In the prior art, following several method is arranged generally:

1, do mandrel always, it is matched in clearance that outside diameter of mandrel cooperates with the workpiece endoporus.This mode is can be satisfactory to the form and position tolerance of processing general requirement.Because gapped, so be infeasible for the form and position tolerance of high requirement.And this mode is very difficult when assembling for big workpiece.

2, do a tapering mandrel, this installation way is the most reliable, but axial location has skew.No matter because the workpiece endoporus of what form, always allowable tolerance is arranged, position when causing being contained on the tapering mandrel is inconsistent so occur inconsistent with the endoporus of batch part, and this lathe for the processing of numerical control class is infeasible.

3,, just can only adopt school accent mode to process, i.e. the mode processing parts on centering endoporus, centering plane for the higher workpiece of Geometrical Tolerance Principle.This mode is fine for small lot, single-piece work, but for the part of batch machining, this mode is more loaded down with trivial details, has a strong impact on working (machining) efficiency.

Summary of the invention

The utility model is at the problems referred to above, the positioning core axle that provide a kind of and locate accurately, repeatable accuracy is high, is applicable to batch process.

According to the technical solution of the utility model: mandrel is provided with the spindle nose and the shaft shoulder, and described spindle nose suit has the plurality of steel balls of retainer, and the double diameter sum of the diameter of described spindle nose and a steel ball is more than or equal to the diameter of bore of workpiece.

The end of described spindle nose is provided with threaded shaft extension, sequence unit pressing plate and nut on the shaft extension.Two end faces of described mandrel are provided with center hole.Perhaps an end of described mandrel is set to placentation.The plane of the described shaft shoulder is provided with the screwed hole of fixation workpiece.Described steel ball is provided with two groups.

Technique effect of the present utility model is:

1, the utility model adopts the steel ball be installed on the spindle nose to cooperate endoporus location to workpiece with no gap between the workpiece, adopts the datum level location of the shaft shoulder to workpiece, can be effectively, reliable fixation workpiece, improve the stability of crudy greatly.

2, adopt the utility model can effectively eliminate artificial clamping hidden danger.

3, adopt the utility model clamping facility, improved operating efficiency greatly.

4, the utility model scope of application is wider, and fricton-tight friction, and the life-span is longer.

5, the utility model is simple in structure, and manufacturing cost is lower.

Description of drawings

Fig. 1 is the structural representation of first kind of embodiment of the utility model;

Fig. 2 is the structural representation of second kind of embodiment of the utility model.

The specific embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present utility model is further described.

As shown in Figure 1 and Figure 2, a kind of positioning core axle of the utility model, mandrel 1 is provided with the spindle nose 8 and the shaft shoulder 9, and spindle nose 8 is set with the plurality of steel balls 3 that has retainer 2, and the double diameter sum of the diameter of spindle nose 8 and single steel ball 3 is more than or equal to workpiece 4 diameter of bores.Steel ball 3 is provided with two circles, and with the contact area of increase with spindle nose 8 and workpiece 4, steel ball 3 is not easy to wear.The shaft shoulder 9 is used for the datum level of workpiece 4 is made axial location, and steel ball 3 is loaded in the endoporus of workpiece 4 workpiece 4 is done circumferentially location.

According to the difference of workpiece type, the utility model mainly is divided into two kinds: a kind of is two top formulas, and a kind of is placentation.

As shown in Figure 1, be first kind of embodiment of the present utility model, be two top formula positioning core axles.Two end faces of mandrel 1 are provided with center hole, are used for cooperating with top.Spindle nose 8 the end be provided with threaded shaft extension 7, sequence unit pressing plate 5 and nut 6 on the shaft extension 7.Workpiece 4 is pushed down by pressing plate 5, with nut 6 lockings.

As shown in Figure 2, be second kind of embodiment of the present utility model, be the placentation positioning core axle.One end of mandrel 1 is set to placentation.The plane of the shaft shoulder 9 is provided with the screwed hole of fixation workpiece 4.Workpiece 4 device is fixed in the screwed hole on the shaft shoulder 9 planes, again with nut 6 lockings by studs on the shaft shoulder 9.

Operation principle of the present utility model: this device mainly is after the diameter of axle by spindle nose 8 adds twice steel ball 3 diameters, and the size that draws is more than or equal to workpiece 4 endoporus, just gapless cooperation.The maximum of accomplishing allowable tolerance when workpiece 4 endoporus, and the diameter of axle of spindle nose 8 guarantees that the magnitude of interference is 0mm～0.002mm when being machined to the minimum of a value of allowable tolerance; The maximum interference amount is generally 0.035mm～0.045mm by the decision of hole tolerance.Because the rollability of steel ball 3 is so though the maximum interference amount is arranged, the operative employee can pack workpiece on the mandrel very easily.

Use that prerequisite of the present utility model is that the footpath of wanting earlier centering spindle nose 8 is jumped, the beating of the plane of orientation of the shaft shoulder 9, then when changing the outfit workpiece 4, as long as the cleaning on each surface of maintenance is just passable at every turn.

Place novel in design of the present utility model applies to this form processing for the characteristics with steel ball, and is simple in structure, but is skillfully constructed.

Claims

1, a kind of positioning core axle, it is characterized in that: mandrel (1) is provided with the spindle nose (8) and the shaft shoulder (9), described spindle nose (8) suit has the plurality of steel balls (3) of retainer (2), and the double diameter sum of the diameter of described spindle nose (8) and a steel ball (3) is more than or equal to the diameter of bore of workpiece (4).

2, according to the described positioning core axle of claim 1, it is characterized in that: the end of described spindle nose (8) is provided with threaded shaft extension (7), and shaft extension (7) goes up sequence unit pressing plate (5) and nut (6).

3, according to the described positioning core axle of claim 2, it is characterized in that: two end faces of described mandrel (1) are provided with center hole.

4, according to the described positioning core axle of claim 1, it is characterized in that: an end of described mandrel (1) is set to placentation.

5, according to the described positioning core axle of claim 4, it is characterized in that: the plane of the described shaft shoulder (9) is provided with the screwed hole of fixation workpiece (4).

6, according to the described positioning core axle of claim 1, it is characterized in that: described steel ball (3) is provided with two groups.