CN105382502A - Efficient numerical control machining method for thin and long beam type parts - Google Patents

Abstract

The invention relates to an efficient numerical control machining method for thin and long beam type parts. The efficient numerical control machining method includes the following steps: (1) analyzing part material information, the wool state and the structure feature, and selecting a numerical control machining tool; and (2) setting a rough and finish machining process scheme, setting the front faces of the parts to be faces A, and setting the back faces of the parts to be faces B; and through a correction working procedure of a boss of a milling process, reducing the machining deformation of the parts, and meeting the technical requirements through repeated front and back face rough and finish machining. By means of the efficient numerical control machining method, a pressing device and a process lug sheet are arranged, the rough and finish machining allowance is reasonably allocated, the correction working procedure is arranged in a jointing working procedure for part rough and finish machining, and efficient numerical control machining of the thin and long beam type parts is achieved.

Description

A kind of HECNCM method of elongated beam-like part

Technical field

The present invention relates to a kind of HECNCM method of elongated beam-like part, belong to digital control processing field.

Background technology

In Field of Aviation Manufacturing, the part of monolithic construction is enabled on a large scale, embodying a concentrated expression of some loads supports on beam-like part, and the beam-like part of monolithic construction needs to adopt forging blank manufacture mostly, this kind of forging blank allowance balance is uneven, in slim-lined construction, easily occur tilting or lateral bending distortion in thick finishing passes, web, rib, edge strip tolerance zone are little, difficulty of processing is large, if do not adopt corresponding means in process, assisted heat treatment process can be increased unavoidably or occur defective work, have impact on the service life of whole aircraft.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of HECNCM method of elongated beam-like part, the method setting compacted position and technical lug, the thick allowance for finish of reasonable distribution, correcting process is set in part thick accurately machined linking operation, realizes the HECNCM method of elongated beam-like part.

For overcoming the above problems, concrete technical scheme of the present invention is as follows: a kind of HECNCM method of elongated beam-like part, comprises the following steps:

1) part material information, woollen state and design feature is analyzed, and selected numerical control machine tool;

2) set thick fine-processing technique scheme, part front is set as A face, and reverse side is set as B face;

2.1) milling origin reference location face, for stretching centering and stationary positioned;

2.2) drill fabrication hole, mill out several false bosses, false boss is symmetrical arranged along slender beam class axis of workpiece direction;

2.3) adopt pressing plate to fix all false bosses, roughing part A face, is machined to 7.0mm surplus by blank;

2.4) part turn-over, fixes all false bosses with pressing plate, and roughing B face, is machined to 7.0mm surplus by blank;

2.5) gap detection operation: unclamp all pressing plates, clearance gauge is used to check the numerical value that all boss tilt in its natural state, namely the gap width between boss lower surface and positioning table surface, and be marked at corresponding boss surface with marking pen, this gap width is deflection;

2.6) correcting process before semifinishing: if an arbitrary boss does not tilt or the gap width of an arbitrary boss is all not more than 0.2mm, directly carry out 2.7 steps; If when the gap width of an arbitrary boss is greater than 0.2mm, in its natural state by all false boss upper surfaces of maximal clearance value milling, all boss upper surfaces are machined to sustained height value;

2.7) semifinishing B face, is machined to 2.0mm by B face surplus by 7.0mm;

2.8) part turn-over, semifinishing A face, is machined to 2.0mm by A face surplus by by 7.0mm;

2.9) step 2.5 is repeated), the gap width after semifinishing is detected;

2.10) correcting process before fine finishining: if an arbitrary boss does not tilt or the gap width of an arbitrary boss is all not more than 0.2mm, directly carry out 2.11 steps; If when the gap width of an arbitrary boss is greater than 0.2mm, in its natural state by all false boss upper surfaces of maximal clearance value milling, all boss upper surfaces are machined to sustained height value;

2.11) fine finishining A face, is machined to 0mm by part surplus by 2.0mm;

2.12) part turn-over, fine finishining B face, is machined to 0mm by part surplus by 2.0mm;

2.13) Cutting process boss, the boss with fabrication hole does not cut off, and all the other all false bosses all cut off, and namely complete nc program.

The HECNCM method of this elongated beam-like part sets correcting process before semifinishing and fine finishining, eliminated by process means or reduce the deflection of part in process, part is avoided after digital control processing, to occur lateral bending or tilt phenomenon, this method is by false boss Set and Positioning, namely frock manufacturing cost is saved, overall processing efficiency can be improved again, be with a wide range of applications in the processing and manufacturing of beam structure part.

Accompanying drawing explanation

Fig. 1 is elongated beam-like part top view;

Fig. 2 is elongated beam-like part side view;

Fig. 3 is the A-A sectional view of Fig. 1;

Fig. 4 is the B-B sectional view of Fig. 1.

Wherein 1 is slender beam part; 2 is false boss lower surface; 3, false boss upper surface; 4, the false boss of fabrication hole is with; 5, fabrication hole; 6, false boss; 7, positioning process platform surface.

Detailed description of the invention

As shown in Figures 1 to 4, a kind of HECNCM method of elongated beam-like part, comprises the following steps:

1) part material information, woollen state and design feature is analyzed, and selected numerical control machine tool;

2) set thick fine-processing technique scheme, part front is set as A face, and reverse side is set as B face;

2.1) milling origin reference location face, for stretching centering and stationary positioned;

2.2) drill fabrication hole, mill out several false bosses, false boss is symmetrical arranged along slender beam class axis of workpiece direction;

2.3) adopt pressing plate to fix all false bosses, roughing part A face, is machined to 7.0mm surplus by blank;

2.4) part turn-over, fixes all false bosses with pressing plate, and roughing B face, is machined to 7.0mm surplus by blank;

2.5) gap detection operation: unclamp all pressing plates, clearance gauge is used to check the numerical value that all boss tilt in its natural state, namely the gap width between boss lower surface and positioning table surface, and be marked at corresponding boss surface with marking pen, this gap width is deflection;

2.6) correcting process before semifinishing: if an arbitrary boss does not tilt or the gap width of an arbitrary boss is all not more than 0.2mm, directly carry out 2.7 steps; If when the gap width of an arbitrary boss is greater than 0.2mm, in its natural state by all false boss upper surfaces of maximal clearance value milling, all boss upper surfaces are machined to sustained height value;

2.7) semifinishing B face, is machined to 2.0mm by B face surplus by 7.0mm;

2.8) part turn-over, semifinishing A face, is machined to 2.0mm by A face surplus by 7.0mm;

2.9) step 2.5 is repeated), the gap width after semifinishing is detected;

2.10) correcting process before fine finishining: if an arbitrary boss does not tilt or the gap width of an arbitrary boss is all not more than 0.2mm, directly carry out 2.11 steps; If when the gap width of an arbitrary boss is greater than 0.2mm, in its natural state by all false boss upper surfaces of maximal clearance value milling, all boss upper surfaces are machined to sustained height value;

2.11) fine finishining A face, is machined to 0mm by part surplus by 2.0mm;

2.12) part turn-over, fine finishining B face, is machined to 0mm by part surplus by 2.0mm;

2.13) Cutting process boss, the boss with fabrication hole does not cut off, and all the other all false bosses all cut off, and namely complete nc program.

Claims (1)

1. a HECNCM method for elongated beam-like part, is characterized in that comprising the following steps:

Analyze part material information, woollen state and design feature, and selected numerical control machine tool;

Set thick fine-processing technique scheme, part front is set as A face, and reverse side is set as B face;

2.1) milling origin reference location face, for stretching centering and stationary positioned;

2.2) drill fabrication hole, mill out several false bosses, false boss is symmetrical arranged along slender beam class axis of workpiece direction;

2.3) adopt pressing plate to fix all false bosses, roughing part A face, is machined to 7.0mm surplus by blank;

2.4) part turn-over, fixes all false bosses with pressing plate, and roughing B face, is machined to 7.0mm surplus by blank;

2.5) gap detection operation: unclamp all pressing plates, clearance gauge is used to check the numerical value that all boss tilt in its natural state, namely the gap width between boss lower surface and positioning table surface, and be marked at corresponding boss surface with marking pen, this gap width is deflection;

2.6) correcting process before semifinishing: if an arbitrary boss does not tilt or the gap width of an arbitrary boss is all not more than 0.2mm, directly carry out 2.7 steps; If when the gap width of an arbitrary boss is greater than 0.2mm, in its natural state by all false boss upper surfaces of maximal clearance value milling, all boss upper surfaces are machined to sustained height value;

2.7) semifinishing B face, is machined to 2.0mm by B face surplus by 7.0mm;

2.8) part turn-over, semifinishing A face, is machined to 2.0mm by A face surplus by by 7.0mm;

2.9) step 2.5 is repeated), the gap width after semifinishing is detected;

2.10) correcting process before fine finishining: if an arbitrary boss does not tilt or the gap width of an arbitrary boss is all not more than 0.2mm, directly carry out 2.11 steps; If when the gap width of an arbitrary boss is greater than 0.2mm, in its natural state by all false boss upper surfaces of maximal clearance value milling, all boss upper surfaces are machined to sustained height value;

2.11) fine finishining A face, is machined to 0mm by part surplus by 2.0mm;

2.12) part turn-over, fine finishining B face, is machined to 0mm by part surplus by 2.0mm;

2.13) Cutting process boss, the boss with fabrication hole does not cut off, and all the other all false bosses all cut off, and namely complete nc program.