First, the workpiece introduction
The workpiece material A3 to be processed, the workpiece processing process includes the basic processing in the turning process, such as the outer circle, the inner hole, the thread, the chamfering, etc., the workpiece has both the matching precision requirements and the quality requirements. Due to the pressure generated by the compression of the air, the workpiece can be automatically vented, so the quality is strictly required. The assembled mass is 220 g (maximum 230 g, minimum 210 g), and the wall thickness is 1.25 mm. When the workpiece is machined, it is necessary to ensure a more accurate concentricity, which is difficult to process.
Second, the conventional processing technology
1. The outer circle of the car requires an accuracy of Φ45.5mm and cuts it to 104mm.
2. Wrap the outer circle with a copper piece, use the drill bit and the inner circular arc knife to machine the inner hole of Φ43 first, and then machine the internal thread of M35×1.
3. After the completion, the semi-finished products are taken out, the first and the last are reversed, and the outer surface of the other end is processed, so that the exhaust valve and the research and control valve can be precisely matched.
Third, the reform and exploration of processing technology
1. Basic ideas. Since the workpiece wall thickness is 1.25 mm, a high degree of coaxiality is required. According to the conventional processing method, the product has high rejection rate and low processing efficiency, and considering that the processed parts are mass-produced, the workpiece is specially fabricated (as shown in the workpiece 2), and the fixture is processed at the left end. The outer conical surface of 1:19.18 is for clamping on the inner hole of the spindle of the bed. The right side is machined into an outer conical surface of 1:20. The right inner hole is Φ45.5mm to be good with the outer circumference of the workpiece. The outer tapered surface with an inner hole length of 85 mm is divided into four quarters by using a milling machine, and a groove of Φ3 mm is milled, so that under the action of external force, it can tightly fit with the outer circle of the workpiece after being contracted, and Produces a uniform tightening force, which increases the coaxiality. In order to make the outer tapered surface of the workpiece 2 work, the workpiece 3 is machined, and the inner three tapered surfaces of the workpiece are matched with the outer tapered surface of the workpiece 2. The contraction produces a uniform force while contracting, and the workpiece is tightened to improve the coaxiality. .
2. New processing process
(1) Processing fixture
A. Use 45# steel, first according to the process requirements, processing the left part of the diagram to match the CA6140.
B. It is processed according to the process requirements and has a length of 30mm M80×3 external thread.
C. Machine the inner hole of Φ45.5mm on the right side.
D. High precision is required because the outer circumference of the workpiece is matched, and after a 4 mm empty knife amount, a 1:20 taper surface is processed.
(2) Machining and assembly of workpieces
A. Using 45# steel, machine the workpiece with the M80×3 internal thread with a length of 20mm and leave a blank amount of 5mm.
B. Machining the 1:20 inner cone surface with the workpiece two.
(3) Processing automatic exhaust valve
A. The outer diameter of the axle is Φ45.5mm. According to the length of the workpiece, the cutting length is 104mm. Because it is a large-volume production, multiple semi-finished products can be processed at the same time.
B. After the left end of the workpiece is matched with the CA6140 spindle, the half of the workpiece is matched with the right inner hole of the workpiece, and the workpiece 3 is matched with the workpiece 2. The shrinkage gap is used to hold the workpiece with a uniform external force.
C. For the workpiece according to the process requirements, the inner hole of Φ43 is first processed with the drill bit and the inner circular arc knife. In order to cooperate with the workpiece four, the internal thread of M35×1 is processed.
D. After the processing is completed as required, the semi-finished workpiece is taken out, the first and the last are reversed, and the outer surface of the other end is processed to make the exhaust valve and the research and control valve closely match.
(4) Machining the workpiece four.
The workpiece 4 is threaded with the workpiece. This is the whole process of machining the workpiece one. In order to machine the workpiece, the workpiece 2 and the workpiece 3 are additionally processed. Through the new processing measures of the workpiece, we feel that the labor productivity is greatly improved, and the product rejection rate is greatly reduced.
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