CN109967810A - A kind of multi-thread spark cutting processing method of ruled surface - Google Patents

Abstract

A kind of multi-thread spark cutting processing method of ruled surface.Multiple multiple-grooved line rollers are manufactured, groove can just wrap up the wire electrode to be wound, and limit circular runout of the wire electrode in wire transporting process, and the distance of adjacent trenches is smaller plus the distance of discharging gap when processing than wire electrode diameter；Multiple-grooved line roller is installed on electric spark linear cutting machine, and by Single lead wire tray around wire electrode parallel nets being formed, on two end Jie wire storage cylinder of wire electrode；In the upper and lower side of wire electrode parallel lines wire side, touching top is carried out to wire electrode parallel nets, Curved surface spline plate is made of wear-resistant material, and the angle according to edge between the fluctuating of the edge of Curved surface spline plate or Curved surface spline plate is different, and wire electrode parallel lines wire side is made to become ruled surface from plane；Open Wire EDM subsidiary conditions；The metal plates workpiece admission being already installed on processing platform is processed, is processed, i.e., obtains the ruled surface being consistent with electrode wire mesh on metal plates workpiece.

Description

A kind of multi-thread spark cutting processing method of ruled surface

Technical field

The present invention relates to ruled surface processing, more particularly, to a kind of multi-thread spark cutting processing method of ruled surface.

Background technique

Application of the ruled surface in engineering is quite extensive, for example, the dome of building, aero-engine spoon of blade, Various injector nozzles etc., but as all Machining of Curved Surface, the processing of ruled surface is equally faced with processing difficulties, processing work The feature of skill complexity, therefore pursue that ruled surface is simple, efficient processing method is always industrial important need.

Current ruled surface processing method mainly has multi-axis milling processing and electrical discharge machining.Since ruled surface is opposite The mathematical model of other curved surfaces is more simple, just has mark that can follow around the machining locus building of ruled surface from point to surface, therefore Traditional Milling Process is applied at first in ruled surface processing.But because of the characteristic of curved-surface structure spatial complex, Milling Process High-accuracy Multi-axis simultaneous machining is still needed, so the Milling Process of ruled surface is faced with and conventional curved-surface Milling Process one The difficulty of sample, the i.e. planning and the control problem of more motor linkages of machining path.Meanwhile with difficult-to-machine materials such as high temperature alloys Extensive use, requirement of the Machining of Curved Surface to milling cutter is also higher and higher, therefore the limitation of Milling Process is also increasing. Spark erosion technique is the special processing technology occurred the 1950s, passes through the pulse feature spark discharge of electrode and workpiece The instantaneous high-temperature of generation removes workpiece surface material to reach the editing objective of workpiece shaping.Electric spark milling and processing and forming can So that the processing of difficult-to-machine material becomes simple and conveniently, but due to export license, the precision and range of Machining of Curved Surface are still big It is big limited.The appearance of Wire EDM revolution processing makes ruled surface become line processing from original point processing, simplifies The path programming of original Milling Process, and since wire electrode is continuous axially reciprocating, export license also almost can be with Ignore.In article " exploitation of Wire EDM two-axis numerical control revolving platform " (DOI:10.3969/j.issn.1001- 8972.2015.19.031) in, Zhao Yazhou et al. is returned by increasing two-axis numerical control on high-speed wire electrical discharge machine tool Turntable attachment, to allow Wire EDM that can more efficiently process complicated ruled surface.But this method is to make workpiece Processing realize turn, pendulum it is four-axle linked with two moving directions, the building and planning of machining path track are appointed right sufficiently complex.By The huge material removal amount required for general surface is processed, industrially need it is a kind of it is more efficient, trajectory planning is simpler Single processing method.

Summary of the invention

It is an object of the invention to for feeding complexity, low efficiency, electrode existing for traditional ruled surface linear cutter The problems such as big is lost, the multi-thread spark cutting processing method of a kind of ruled surface being wound repeatedly using wire electrode is provided.

The present invention the following steps are included:

1) multiple multiple-grooved line rollers are manufactured, groove can just wrap up the wire electrode to be wound, and limit wire electrode in wire transporting process When circular runout, the distances of adjacent trenches than wire electrode diameter plus processing when discharging gap distance it is 10~20 μm small, protect Card electrode wire mesh will not have the workpiece area for not being discharged corrosion when electro-discharge machining is fed between wire electrode and wire electrode Domain；

2) multiple-grooved line roller is installed on electric spark linear cutting machine, and by Single lead silk on multiple multiple-grooved line rollers Phenomena such as coiling in shape of threads, folded silk does not occur, intersects, forms wire electrode parallel nets, two end Jie wire electric discharge of wire electrode On cutting off machine wire storage cylinder, reciprocal wire transporting is realized using the period positive and negative rotation of wire storage cylinder；

3) in the upper and lower side of wire electrode parallel lines wire side, the Curved surface spline plate pair of certain undulations is had with side respectively Wire electrode parallel nets carry out touching top, and Curved surface spline plate is made of wear-resistant material, according to the edge of Curved surface spline plate rise and fall or The angle at edge is different between Curved surface spline plate, and wire electrode parallel lines wire side is made to become ruled surface from plane, ruled surface Pattern, shape are determined by Curved surface spline plate；

4) Wire EDM subsidiary conditions, including the reciprocal wire transporting of wire electrode, application high-frequency current, auxiliary fliud flushing are opened Deng；

5) to the metal plates workpiece admission being already installed on processing platform, process is carried out；

6) process finishing obtains the ruled surface being consistent with electrode wire mesh on metal plates workpiece.

The present invention directly passes through electrospark wire electrode and forms complex-curved gauze, by Machining of Curved Surface by the line of revolution wire cutting Processing becomes face processing, further promotes processing efficiency, simplifies machining path and plans difficulty.

It is found during Wire-cut Electrical Discharge Machining, Wire EDM wire electrode itself has certain elasticity and stretches Contracting nargin, therefore allow stretcher strain in a certain range, i.e., within the scope of the maximum pull that wire electrode allows, there is utilization The wear-resistant material parts of side band fluctuating pattern, by multi-thread wire electrode parallel nets moulding be twisted into Chinese yeast rate ruled surface can Row.Herein on basis, the wire spacing of electric spark multi-wire saw is controlled within discharging gap, can allow electrical spark working Work becomes face from line processing and processes.According to this basic ideas, the present invention is achieved by the following technical solutions, wherein step 1)~3) be a kind of multi-thread spark cutting processing unit (plant) of ruled surface construction step, step 4)~6) using ruled surface it is more The procedure of processing of line spark cutting processing unit (plant) processing straight curved surface.

The advantage that there is the present invention electrical discharge machining, linear cutter, face to process simultaneously, compares traditional Milling Process, Electric discharge machining method has the characteristics that no cutting force, the range of work are wide, is more suitable the songs of the difficult-to-machine materials such as high temperature alloy Face processing；Electric spark milling and processing and forming are compared, Wire EDM has the characteristics that export license is low, to Machining of Curved Surface Precision controlling is higher；Traditional Wire-cut Electrical Discharge Machining ruled surface structure is compared, using adding for multi-thread wire electrode composition gauze Line processing is become face processing by work method, while simplifying machining locus programming, and the feeding process for processing ruled surface becomes Simply, conveniently.

Detailed description of the invention

Fig. 1 is 1~4 side partial schematic diagram of multiple-grooved line roller.In Fig. 1, label A is wire electrode slot.

Fig. 2 is the schematic diagram that wire electrode 5 coils on multiple-grooved line roller 1~4.

Fig. 3 is the moulding of Curved surface spline plate 6 and 7 pair parallel nets.

Fig. 4 is the process schematic diagram of ruled surface.In Fig. 4, flag F is wire transporting direction, and G is direction of feed.

Specific embodiment

It elaborates with reference to the accompanying drawing to the embodiment of the present invention.

It is different according to the fluctuating pattern of silk pressing stick side, it can process to obtain different types of ruled surface, the present embodiment It is mainly used for the processing of convolute ruled surface, i.e., Curved surface spline edges of boards edge is all straight line up and down.

Referring to Fig. 1~4, processing unit (plant) involved by the present embodiment includes electric spark linear cutting machine, multiple-grooved line roller 1~4, electricity Polar filament 5 and Curved surface spline plate 6 and 7, specific component pattern and implementation steps are as follows:

1) select Cr12 mould steel as multiple-grooved line roll material, multiple-grooved line roller side sectional partial view such as Fig. 1, wire electrode 5 is straight The molybdenum filament of diameter 0.18mm, Curved surface spline plate 6 and 7 are plate wear-resistant ceramic material；

2) multiple-grooved line roller 1~4 is mounted on electric spark linear cutting machine, wire electrode 5 is coiled in multiple-grooved line roller 1~4 On, as shown in Fig. 2, forming electrode wire mesh B between multiple-grooved line roller 2 and 4,5 head and the tail both ends of wire electrode are fixed on wire electric discharge On the wire storage cylinder of cutting off machine；

3) moulding is carried out with 6,7 pairs of electrode wire mesh of Curved surface spline plate, electrode wire mesh is made to become spiraling from flat state Face ruled surface C, such as Fig. 3；

4) the clamping conductive material workpiece on the processing platform of electric spark linear cutting machine；

5) the wire storage cylinder periodic reverse rotation of electric spark linear cutting machine, making wire electrode 5, in axial direction the period is reciprocal Movement applies high-frequency pulse current to wire electrode 5, carries out aim at tool operation；

6) it carries out slowly feeding to workpiece D along primary electrode wire mesh plane normal direction to discharge, to discharging gap in process Auxiliary applies wire cutting emulsion E, process such as Fig. 4；

7) process finishing closes power supply, removes workpiece.

Claims (1)

1. a kind of multi-thread spark cutting processing method of ruled surface, it is characterised in that the following steps are included:

1) multiple multiple-grooved line rollers are manufactured, groove can just wrap up the wire electrode to be wound, and limit wire electrode in wire transporting process The distance of circular runout, adjacent trenches is 10~20 μm smaller plus the distance of discharging gap when processing than wire electrode diameter, guarantees electricity Polar filament gauze will not have the workpiece area for not being discharged corrosion when electro-discharge machining is fed between wire electrode and wire electrode；

2) multiple-grooved line roller is installed on electric spark linear cutting machine, and is in spiral shell on multiple multiple-grooved line rollers by Single lead silk The coiling of line shape does not occur folded silk, crossover phenomenon, forms wire electrode parallel nets, two end Jie electric spark wire cutting machine of wire electrode On bed wire storage cylinder, reciprocal wire transporting is realized using the period positive and negative rotation of wire storage cylinder；

3) in the upper and lower side of wire electrode parallel lines wire side, the Curved surface spline plate with side with certain undulations is to electrode respectively Silk parallel nets carry out touching top, and Curved surface spline plate is made of wear-resistant material, according to the fluctuating of the edge of Curved surface spline plate or curved surface The angle at edge is different between batten plate, and wire electrode parallel lines wire side is made to become ruled surface, the pattern of ruled surface from plane It is determined by Curved surface spline plate；

4) Wire EDM subsidiary conditions, including the reciprocal wire transporting of wire electrode, application high-frequency current, auxiliary fliud flushing are opened；

5) to the metal plates workpiece admission being already installed on processing platform, process is carried out；

6) process finishing obtains the ruled surface being consistent with electrode wire mesh on metal plates workpiece.