Previous post in the series: Technological process of sleeve, part 1.
In the entry Sleeve – framework process – forging, a blank design is presented as forging. This project applies as part of the framework technological process discussed first, using conventional machine tools. The design of the blank as a forging can be developed as a variant using the initial execution of cavities for the hole. As a result of the analysis, a full blank was selected.
Below (Table 1) the general technological process is presented in the form of a list.
|Operation No.:||Technological operation:||Machining station:|
|10||Roughing external surfaces and shaping machining the hole.||Manufacturing lathe.|
|20||External surface shaping machining. Machining the hole from the other side of the workpiece.||Manufacturing lathe.|
|40||Hole boring.||Boring machine.|
|50||External surface grinding.||Cylindrical grinder.|
|60||Washing and drying.|
|70||Final technical control.|
Table 2 contains a description of the cuts of the first sleeve technology operation (10 – Table 1).
|Cut No.:||Description of the technological cut:|
|2||Turn Ø60,5 -0,5|
|4||Drill port Ø14.|
|5||Boring Ø30H8 na Ø29,5 +0,2|
|6||Chamfer 2-45º na 2,25-45º na Ø30H8|
|8||Turn Ø50,5 -0,2|
|9||Chamfer 2-45º; 2,25-45º; Ø50,5 -0,2|
Below (figure 1) technological sketch for the discussed operation 10 (the so-called first).
The presented operation 10 (the first) is the first performed on the blank. Hence, among others a self-centering three-jaw chuck was used with unground jaws (the technological symbol number 3 is not in a circle). Such jaws are recommended for fixing and clamping on surfaces with high roughness and the possibility of significant shape errors.
A Ø14 through hole is made, which by definition is a normal hole, and therefore it does not pose a special technological challenge.
The rules for the first operation [Feld2000] recommend roughing of external surfaces and pre-machining or final of the hole. Shaping of external surfaces is allowed. Making a ready-made hole is a recommendation that is particularly considered in each case. The technological possibilities of hole machining allow the technical implementation of this principle without major problems. However, it is necessary to analyze the issue of using the hole surface in subsequent operations as the fixing and clamping surface of the workpiece. If so, you cannot make a ready hole in the first operation. The use of the hole surface for fixing and fixing is associated with its potential damage and thus failure to meet the requirements.
- Feld M., Podstawy projektowania procesów technologicznych typowych części maszyn, WNT 2000
- Kapiński S., Skawiński P., Sobieszczański, Sobolewski J.Z., Projektowanie technologii maszyn, OWPW2002
- Puff T., Technologia budowy maszyn, PWN 1985
- Rudaś T., Materiały dydaktyczne – ZAOiOS WIP PW