Introduction General part

2.3 Mechanical processing plan for detail surfaces.
005. Central milling operation. Central milling machine.
010. Countersinking/ Milling/ Bevelling/ Threading operations.
015. Milling / Countersinking / Bevelling / Threading operations.
020. Drilling operation.

Operation№	The name of the operation and the content of the transitions	Base surface	Fixing surfaces	Workshop name and type
005	Milling operation
	A and P installation
1	Milling E and K side surfaces L=90 mm long	J	J,P
010	Milling operation
	A and P installation
1	Countersinking surface D Ø14mm	J	J,P
2	Countersinking surfaces B and C Ø20mm, 2x45	J	J,P
3	Milling surface E Ø28mm	J	J,P
4	Countersinking-bevelling surface M Ø18mm, 3x45 nad 2x45	J	J,P
5	Threading surface N M22-7H	J	J,P
015	Milling operation
	E and K installation
1	Milling surface J	K	E,K
2	Countersinking-bevelling surfaces H and I, Ø32mm, 2x45 and 3x45	K	E,K
3	Threading surface F M36-7H	K	E,K
020	Drillig operation
1	Installation Q and R surfaces
2	Drilling surface T	S	Q,R

2.4 Substantiation of selected technological processes.

In mechanical engineering, the main role in the mechanical processing of parts is played by their technological and quantitative characteristics. This means that the structural dimensions of the part and the technical requirements for them should be studied and taken into account when machining surfaces. Factors such as the choice of method of production, the size and material of the part, the job description, the technical requirements for its preparation, the annual program and the overall structure determine. To solve this problem, it is necessary to ensure that the size and structure of the workpiece is as close as possible to the size and structure of the part. But it should be borne in mind that increasing the accuracy of the workpiece and complicating its structure will lead to an increase in its cost. Therefore, the optimal method of obtaining billets is when the cost of billets is low. Gray cast iron is 15-32. preparation method We use the casting method. In mechanical engineering, the main role in the mechanical processing of parts is played by their technological and quantitative characteristics. Therefore, it is necessary to study the design dimensions of the part and the technical requirements to them and pay attention to them in the mechanical treatment of surfaces. The central hole in the main surfaces of the detail is the DEOG, in which another detail is mounted. Therefore, its surface cleanliness is 3.2 μm, the surface of TTV holes is 3.2 μm, the remaining surfaces are AVBE surfaces with an accuracy of 6.3 μm, and the O surface does not require mechanical processing. Ensure that the surfaces of the torus are perpendicular to the central axis BAV and O. Angle radii on unspecified surfaces are 1.5 mm. We use 6R80G machine for horizontal milling, 2H125 vertical drilling machine for drilling holes, 2M615 machine tool for drilling internal holes.
When machining surfaces, we use cylindrical disc cutters, spiral drill, countersinker and expansion cutters. Their cutting material is hard alloy BK6, BK8, BK9. We use mainly parallel surfaces and central holes in the base. Depending on the type of production, we use special pneumatic and hydraulic devices, conductor plate devices for drilling holes in cylindrical surfaces.

5.