What is the eccentric wheel shaft part:
An eccentric workpiece is a part whose outer circle and outer circle or the axis of the outer circle and the inner hole are parallel and not overlap, and partial a distance of the workpiece. The distance between these two parallel axes is called the eccentricity. Parts with eccentric outer circle and outer circle parts are called eccentric shaft or eccentric disc; parts with eccentric outer circle and inner hole are called eccentric sleeve.
The functions of eccentric wheel shaft parts
In mechanical transmission, rotary motion into reciprocating linear motion or reciprocating linear motion into rotary motion, generally with the help of eccentric parts to complete.
For example, the lubrication pump driven by the eccentric workpiece in the headstock of the lathe, the crankshaft in the automobile engine, etc. In order to conveniently adjust the center distance between shafts, eccentric shafts are usually used in triangular belt drive of planar connecting rod mechanism. General axis, can only drive the workpiece rotation, but the eccentric shaft, can not only transfer rotation, but also transfer revolution.
Eccentric shaft structure and working principle:
When the eccentric axis circle does not rotate about its center, it is an eccentric wheel. Eccentric shaft is also a kind of cam. Generally speaking, the main purpose of the eccentric wheel is to generate vibration, like an electric screen. The vibrators in the mobile phone use eccentric wheels, most of which are circular, because the circular wheel is easy to manufacture and the process is simple.
Eccentric shaft processing principle
Eccentric shaft, eccentric sleeve are generally processed on the lathe. Their processing principle is basically the same; Mainly in the clamping aspects to take measures, that is, the need to process the eccentric part of the axis using marking tools to check or correct the workpiece on the relevant not processed surface, or make the relevant surface and datum between the appropriate position to coincide with the rotating axis of the lathe spindle. General processing eccentric workpiece method has 5 kinds, that is, can be respectively in three jaw chuck, four jaw chuck, needle hole and thimble fit clearance, eccentric chuck, or in the special fixture processing eccentric workpiece.
The main methods of eccentric shaft processing
It is mainly in the clamping aspect to take measures, that is, to find out the axis of the eccentric part that needs machining and make it coincide with the rotating axis of the lathe spindle.
1.Turning eccentric workpiece on 4-jaw single acting chuck: Machining a small number of eccentric workpiece accuracy is not high, generally with four jaw chuck clamping.In the four jaw chuck on the eccentric workpiece, to be marked in the workpiece. It is to draw an eccentric circle and crosshair to ensure the horizontal and vertical orientation of the workpiece, so as to determine its position in the four-jaw chuck according to these lines.
4. Turning eccentric parts between needle hole and thimble: Turning eccentric workpiece with long length, can be clamped, turning in the top pinhole and thimble with clearance, with lathe carrier entrained rotating parts. The center at both ends of the eccentric workpiece processed in the gap between the top pin hole and the thimble, the eccentric center hole is generally processed in the boring machine, because it is difficult to ensure that the direction of the two rectifying center, the partial center hole is consistent and parallel.
2.Machining eccentric workpiece in three – jaw self – centering chuck: When machining the eccentricity is smaller（e≤5-6mm）and the length is shorter, but the number of eccentric workpieces is larger, you can use the three-jaw self-centering chuck to process. When turning, the outer circle and length are processed first. Then it is clamped on a three-jaw chuck, and a shim is placed on one of the jaws to produce a certain eccentricity of the workpiece, and then it is turned. The thickness of the pad can be calculated by the following formula. X=1.5e×(1-e/2d)x=thickness of the pad；e=eccentric distance of the workpiece；d=diameter of the three-claw clamping part）In the actual turning, due to the deviation of the contact position between the claw and the workpiece, the deformation after clamping with the earth gasket also needs to add a correction constant. X true=x+1.5△e（x true=actual gasket thickness； x=calculated thickness ；△ e=measured eccentricity deviation after test).
5. Turning eccentric parts on eccentric chuck, Turning eccentric parts on eccentric chuck is characterized by its eccentric distance is more convenient to adjust, strong versatility, high precision, so it is an ideal turning eccentric tool.
3. Turning eccentric workpiece on double chuck: Turning the eccentric workpiece on the double chuck is to clamp the three-jaw self-centering chuck on the four-jaw single action chuck and then use the marking tool to check or correct the workpiece on the unprocessed surface, or make the relevant surface and datum between the appropriate position. Then move an eccentric clamping, as long as the workpiece clamping in the three-jaw self-centering chuck can be turned eccentric. This eliminates the need to align the workpiece. When moving the three-jaw chuck position, the aperture is sandwiched in the three-jaw self-centering chuck, and the eccentricity is determined by the percentage table, use a dial indicator to determine the eccentricity, and finally confirm the position of the three-jaw chuck in the four-jaw chuck.
6.Turning eccentric workpiece on special fixture: When processing short, high precision and large amount of eccentric workpiece can be turned on the special fixture.
7.In the actual, when processing large eccentric distance and not high demand of the accuracy, we’ve come to the conclusion of another clamping method, three jaw boring bit add gasket clamp, both in the process of three jaw self centering operation, operating first one clamp, and then gently move chuck, chuck end screw up once or twice and then operate no. 2 and no. 3, finally to form three claw chuck eccentric. Because this eccentric is not adjustable, so also add gasket to adjust, the advantage of this method is convenient and fast operation, the disadvantage is that the positioning accuracy is not high.
From the above introduction, we can see that the difficulty of processing this core part is reflected in its high requirements on machining accuracy, and the custom oxidized Aluminum CNC turning components have very complex internal and external structures. It was also a test of whether the CNC turned parts manufacturer machine was sufficiently advanced, and whether the customized oxidized aluminum CNC turning components were processed by experienced machining personnel and engineers. It can be said as a core part that tests the comprehensive processing capability of the CNC turned parts manufacturer.
People also ask
I wonder if you supply CNC turning parts in Canada?
Sure, we have CNC turning parts warehouse in Canada. And we have turning parts warehouses not only in Canada, but also all over the world. So we can make fast delivery, of course, this is all for standard parts. Generally speaking, most customers are tend to customize CNC turning parts, therefore we usually make shipment from our headquarters.