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CNC Machining Technical Analysis​

 CNC Machining Technical Analysis

Machining is the process by a mechanical device dimensions or performance of the workpiece changes. Press difference on processing methods can be divided into cutting and pressure processing.

 Process planning
Design Principles:
(1) shall be designed to ensure the process of order processing quality (or assembly quality machine) machine parts, to the technical requirements on the design drawings.
(2) such that the process has high productivity, product to market as quickly as possible.
(3) trying to reduce manufacturing costs
(4) Note that reduce labor intensity, to ensure production safety.
Sourcebook:
(1) product assembly, parts map.
(2) the quality of the product acceptance criteria.
Annual production Programme (3) of the product.
Information about production conditions (5) manufacturing, including machine tools and process equipment specifications, performance and its current state, the skills of the workers, the factory-made technology and equipment capacity and factory electricity, gas and other abilities.
(6) process planning, process design and equipment needed for the design manual and related standards.
(7) advanced manufacturing technology information.
Step Content:
(1) Analysis of the product assembly drawing and part drawing.
(2) determine the blank.
(3) the preparation process route, select the positioning base surface.
(4) determine the process equipment used.
(5) determine the tools, fixtures, measuring tools and aids used by each process.
(6) determine the technical requirements and test methods for each major step.
(7) to determine the allowance of each process step of computing dimensions and tolerances.
(8) determining the amount of cutting.
(9) to determine the fixed working hours.
In recent years, with the development of numerical control CNC machining technology, good performance machining center to make many parts of the processing more convenient. How to make use of these devices can be efficiently processed more high-quality parts, has become a business concern. In a typical thin-walled disk parts, for example, in recent years, the advantages of high-speed machining applications up fabrication techniques based on the use of existing plant digital control CNC machining equipment, and actively explore a working class part of better technology and digital control CNC program machining process.

Process Analysis 1. Digital control CNC machining (thin-walled disk parts) of

(1) the structural characteristics of the part of the hard parts and materials for the aluminum LY12, the cutting performance is good, typical of thin-walled disc-type structure, larger dimensions, the thickness of the peripheral and internal ribs only 2mm, type cavity depth of 27mm. This part in the process if the process scheme or process parameters set incorrectly, easily deformed, causing the size of the ultra-poor,

(2) the selection process analysis of the rough parts bar, the use of roughing, finishing technology programs, specific process is as follows: blank → roughing → aging → roughing → finishing → finishing. Rough: Reserved 1.5mm respectively in the outer finishing allowance and end, and the center of the pre-drilled holes. Roughing: respectively in the cavity and the bottom side of the reserve margin 1.5mm, and at the pre-drilled holes φ12mm technological holes. Aging: remove material and process stress. Finishing: fine car face, cylindrical holes and boring process φ6mm, requires the completion of a fixture, in order to ensure concentricity, lay the foundation for subsequent processing. Finishing: ensure that the final requirements of parts, is focus of this paper.

① roughing cavity roughing is to remove large margin, and lay the foundation for subsequent finishing, so when the pocket, the low cost of ordinary digital control CNC milling machining. This process required by the structure shown in Fig machined parts inside shaped profile, a circular arc corner of R5mm, the finishing allowance even as 1.5mm. And this procedure also require pre-processing required in the positioning hole finishing hole φ12mm place.

② finishing pockets speed up application processing technology in recent years manufacturing technology. In the high-speed machining, since the cutting force is small, can reduce part machining distortion, more suitable for thin-walled parts, and the chip is cut in a short time, most of the heat is taken away cutting chips, thermal deformation of the workpiece small, will help to ensure the size, shape precision parts; high-speed processing can achieve high surface quality, but also greatly shorten the processing cycle, so the combination of the characteristics of such thin-walled disk parts, the choice of high-speed machining for finishing the cavity.

③ positioning hole machining parts finishing selection of the center hole φ6mm and φ12mm hole as the positioning hole, so it must be in place before finishing the processing cavity. Φ6mm turner center hole when finishing its outer φ301.5mm boring as φ6H8; φ12mm hole by the digital control CNC drilling, milling, reaming to φ12H8.

(3) When finishing the cavity for positioning and clamping the part of the workpiece on the machine can be quickly and correctly clamped and the workpiece during machining than having to find a number of positive, so this process uses two sells targeting methods . In φ6mm and φ12mm hole on the part already exists as a positioning hole, making it easy for tooling, the tooling using a cylindrical flat pin and a pin as the positioning element. Since the parts belong to thin-walled parts, easily deformed when clamping the workpiece, the pressure plate should be relatively rigid in the work site, distributed as evenly as possible to ensure the reliability of the clamping, and clamping force size should be appropriate, positioning of the workpiece to prevent damage or deformation of the workpiece inadmissible. The specific positioning and clamping. This clamping manner fully consistent with the characteristics of a machining center, a fixture to complete the processing of all the holes and cavities.


Keywords: CNC precision machining, precision machining parts, complex parts machining, precision machinery parts processing, the entire parts processing, complex system assembly


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