Analysis of the machining plan and machining method of the motor end cover

The main frame of the integrated motor, the end cover processing process looks very simple, basically the lathe drill is often a hole. But in fact, motor faults such as noise, rotation, and abnormal vibration are often directly related to the machining accuracy of the motor end cover. During the machining of motor end caps, unsuitable factors (such as excessive clamping force or excessive cutting amount, etc.) can easily cause dimensional dispersion and cover deformation, so the correct machining plan and machining method must be repeatedly verified. Here is the experience of motor end caps combined with actual production exploration to discuss this simple but sensitive topic, hopefully helping to formulate solutions and eradicate process defects.

How to improve the processing effect and quality of the motor end cover at the same time?

Motor end cover processing technology

When machining motor end caps, if the clamping force is too high, the seal will be deformed, and reducing the clamping force will reduce the amount of cuts, thereby reducing productivity. Therefore, in order to ensure the machining quality and improve the productivity, the machining is divided into two processes: turning and parking.

Choose the right processing equipment

Small end caps are usually machined with multi-axis semi-automatic lathes, automatic hexagonal lathes or ordinary horizontal lathes, and slightly larger end caps are machined with compound machine tools or special machine tools. Larger end film sound is machined with ordinary vertical lathes, and better electrical factories are machined with digitally controlled machines.

Sealing Solution

There are many methods of sealing. According to the number of bearing chambers and lip machining fashion clips, there are two machining schemes.

Motor end cover processing scheme 1

The basic steps are as follows:

(1) Clamp the end cap on the machine jaw, and align the center and end face.

(2) Rough turning the bearing chamber, the end face of the bearing chamber, the windshield grounding surface and the lip.

(3) Turn the slightly loose claws, parking entrance and end face.

(4) Parking bearing chamber.

(5) Drilling and tapping.

Advantages of this machining scheme: tulips and bearing chambers are extracted from a single clamping, so they have the advantages of high concentricity and less auxiliary work.

The disadvantage of the bearing chamber is that the clamping stress is too large and it is easy to deform. Therefore, in order to avoid clamping deformation, the clamping device must be turned slightly loose after rough turning. When the clamping device is loose, reduce the speed of the stop accordingly. The extent of the return trip is not easy to grasp. If the back loosening is insufficient, deformation will still occur. Rewind too much and the workpiece will move or protrude from the claw when cutting, causing a safety accident.

Motor end cover processing plan 2

The basic steps are as follows:

(1) Snap the end cap on the machine jaw, and align the center and end face.

(2) Rough turning the bearing chamber, the end face of the bearing chamber and the windshield grounding surface.

(3) Rough car and parking exits.

(4) Install the end cap lip to the bead mouth and tighten.

(5) Parking bearing chamber and bearing outdoor end face.

(6) Drilling and tapping.

Different from the one-time clamping processing scheme, the advantages of the double-clamping processing scheme are that the clamping stress has less influence on the deformation of the finishing part, the clamping is stable and reliable, and the cutting speed can be appropriately increased. The disadvantage is that the motor end cover and bearing chamber are not refined in one clamping, and the clamp quality is poor or improperly clamped, which is easy to produce other shafts. At the same time, the double clamping increases the auxiliary working time. However, for large end caps with a large amount of cut, the amount of cut is increased due to the stable clamping, the auxiliary work time of two clamps can be compensated due to the saving of face pre-cutting time, and the overall productivity can be high in some cases in one clamping process.