Bend pipe mould electric pulse processing methodTechnical field
The invention belongs to mold machining technology fields, more particularly to a kind of bend pipe mould electric pulse processing method.
Background technique
Spark-erosion machine tool process principle is that high temperature is generated to the pulse current that electrode applies by surface of workpiece fusing, oxygenChange and be corroded, the characteristics of electrical spark working tool and mould is that the shape of tool-electrode is accurately replicated on workpiece (mold).Therefore, electrode is one of indispensable tool in electrical discharge machining.The rational design and manufacture of electrode, with mold type hole or typeThe machining accuracy of chamber has close relationship.
The pocket machining of current bend pipe mould is usually used machining center milling or by forming grinding wheel grindingMethod, machining accuracy is relatively low, and existing electrical discharge machining lacks a more perfect processing technology, processing weekPhase is longer, causes difficulty of processing big, machining accuracy also it is difficult to ensure that.
Summary of the invention
The purpose of the present invention is to provide a kind of bend pipe mould electric pulse processing method, by electric discharging machining electrode andProcess is improved, and bend pipe mould machining accuracy can be improved, and shortens the process-cycle, solves existing bend pipe mould machining accuracyProblem low, difficulty of processing is big.
The present invention is achieved by the following technical solutions:
The present invention is a kind of bend pipe mould electric pulse processing method, including the following steps:
Step 1: mold pre-processes: by die blank clamping on CNC machining center workbench, milling roughing is carried out,Complete the first one-step forming of type chamber of stationary mould for mould plate and moving template；
Step 2: production electrode: analysis mold drawing determines electrode size, production two according to mold cavity dimensioningRoot dimensional parameters U-typed electrode all the same, is respectively used to processing mold solid plate and dynamic model template chamber；
Step 3: clamping electrode and workpiece: the edge-on clamping of mold being fixed on spark-erosion machine tool workbench, and calibrates and determinesPosition, then electrode is fixed by connection board clamp and the main shaft clamping of spark-erosion machine tool, and calibrate positioning, electrode is vertically and and mouldIt is parallel to have folding face；
Step 4: die-cavity roughing: after in mold drawing import system, determining that system production operation program is error-free, openingDynamic spark-erosion machine tool, machine tool chief axis driving electrodes carry out milling roughing, and surplus is for 0.075-0.1mm；
Step 5: type chamber finishes: being changed without electrode, directly finished, run spark-erosion machine tool main shaft, main shaft drivesMoving electrode carries out milling finish maching；
Step 6: dimension control: mold cavity machining accuracy and surface roughness are examined after mold finishing, if size is smallIn final size, then according to theoretical size difference manual modification program, then dispensable mould chamber finishing is carried out, completes knife and mend；If inspectionQualification is tested, then removes mold and completes processing；If oversized is more than tolerance, workpiece is scrapped.
Further, the electrode uses copper-tungsten material, and electrode cross-section is circle, is bent in the U-typed of electrodeElectrode handle is arranged in portion, and " u "-shaped is opened up in electrode and rushes oilhole, electrode both ends, which open up, rushes oilhole outlet.
Further, the method for electrode size being determined according to mold cavity dimensioning in the step 2 are as follows: electrodeHorizontal size determined by formula a=A ± Kb, and a is the horizontal size of electrode in formula, and A is the horizontal size of type chamber, and K is and typeChamber size marks the related coefficient of method, and b is the unilateral amount of zoom of electrode.
Further, when the step 4 die-cavity roughing electrode electrical parameter are as follows: pulse width 150us-600us addsWork voltage 90V, negative polarity processing.
Further, the electrical parameter of electrode when the step 5 type chamber finishes are as follows: pulse width 2us-10us, processing electricityPress 260V, positive polarity processing.
Further, the stationary mould for mould plate is identical with the cavity dimension of moving template, and roughing is identical with finishing step.
Further, the dimensional machining accuracy of the electrode is not less than it7 class precision, and surface roughness is in Ra0.63-More than 1.25um.
The invention has the following advantages:
The present invention by electric discharging machining electrode and process improvement, design U-shaped electrode to mold cavity once atType, no replacement is required electrode substantially reduce the production cycle, processing step is simple, can significantly improve bend pipe mould machining accuracy.
Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will be described below to embodiment requiredAttached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for abilityFor the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attachedFigure.
Structural schematic diagram when Fig. 1 is electrode machining type chamber of the present invention；
Fig. 2 is the partial sectional view of Fig. 1；
Fig. 3 is the structural schematic diagram of electrode.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, completeSite preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based onEmbodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all otherEmbodiment shall fall within the protection scope of the present invention.
The present invention is a kind of bend pipe mould electric pulse processing method, including the following steps:
Step 1: mold pre-processes: by die blank clamping on CNC machining center workbench, milling roughing is carried out,Complete the first one-step forming of type chamber of stationary mould for mould plate and moving template；
Step 2: production electrode: analysis mold drawing determines electrode size, production two according to mold cavity dimensioningRoot dimensional parameters U-typed electrode all the same, is respectively used to processing mold solid plate and dynamic model template chamber；Electrode is closed using copper tungstenGolden material, electrode cross-section are circle, and electrode handle is arranged in the U-typed bending section of electrode, opens up " u "-shaped in electrode and rushes oilhole,Electrode both ends, which open up, rushes oilhole outlet, and rushing oilhole diameter is 1-1.5mm, and exit type design in both ends can be convenient for chip removal, reduce electrodeLoss is conducive to improve machining accuracy；The horizontal size of electrode determines that a is the horizontal ruler of electrode in formula by formula a=A ± KbVery little, A is the horizontal size of type chamber, and K is coefficient related with cavity dimension mark method, and b is the unilateral amount of zoom of electrode, due to type chamberIt is circle with electrode cross-section, type chamber horizontal size marks in the plane completely, and depth is identical as horizontal size, and K value takes 2,Selecting b value according to electrode material is 0.5；
Step 3: clamping electrode and workpiece: the edge-on clamping of mold being fixed on spark-erosion machine tool workbench, and calibrates and determinesPosition, then electrode is fixed by connection board clamp and the main shaft clamping of spark-erosion machine tool, and calibrate positioning, electrode is vertically and and mouldIt is parallel to have folding face；
Step 4: die-cavity roughing: after in mold drawing import system, determining that system production operation program is error-free, openingDynamic spark-erosion machine tool, machine tool chief axis driving electrodes carry out milling roughing, and surplus is for 0.075-0.1mm, the electrical parameter of electrodeAre as follows: pulse width 150us-600us, machining voltage 90V, negative polarity processing；
Step 5: type chamber finishes: being changed without electrode, directly finished, run spark-erosion machine tool main shaft, main shaft drivesMoving electrode carries out milling finish maching, the electrical parameter of electrode are as follows: pulse width 2us-10us, machining voltage 260V, positive polarity processing；
Step 6: dimension control: mold cavity machining accuracy and surface roughness are examined after mold finishing, if size is smallIn final size, then according to theoretical size difference manual modification program, then dispensable mould chamber finishing is carried out, completes knife and mend；If inspectionQualification is tested, then removes mold and completes processing；If oversized is more than tolerance, workpiece is scrapped.
In the description of this specification, the description of reference term " one embodiment ", " example ", " specific example " etc. meansParticular features, structures, materials, or characteristics described in conjunction with this embodiment or example are contained at least one implementation of the inventionIn example or example.In the present specification, schematic expression of the above terms may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in any one or more of the embodiments or examples to closeSuitable mode combines.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodimentAll details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification,It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present inventionPrinciple and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is onlyIt is limited by claims and its full scope and equivalent.