Auto Wire Cutter DK7745 EDM
The DK7745 belongs to the DK77 series of CNC wire cut EDM machines, which erode a profile with a travelling molybdenum wire instead of cutting it with a tool. That is what lets the machine put a finished contour through hardened steel, carbide and other conductive material that would destroy a milling cutter, with no c...
What This Machine Does
The DK7745 belongs to the DK77 series of CNC wire cut EDM machines, which erode a profile with a travelling molybdenum wire instead of cutting it with a tool. That is what lets the machine put a finished contour through hardened steel, carbide and other conductive material that would destroy a milling cutter, with no cutting force to distort a thin part. Motion is carried on high precision V-shaped guide rails, with linear guide rails as an option, and P3-grade high precision ball screws, so the wire follows the programmed path rather than the backlash in the axes. Standard maximum cutting taper is plus or minus 6 degrees over 80 mm, with plus or minus 15 30 and 45 degrees optional, and positioning precision is within 0.02 mm to GB7926-2005, improving to 0.01 mm with linear guides fitted. Best surface roughness is Ra 2.5 micrometres on a single cut. Machine sizes outside the standard range can be built to a customer's working dimensions.
Why Buyers Choose This Machine
- Cuts hardened tool steel and carbide profiles that milling and grinding cannot produce economically
- No cutting force on the workpiece so thin and fragile profiles do not distort
- V-shaped precision guide rails with P3-grade ball screws hold the wire on the programmed path
- Positioning precision within 0.02 mm to GB7926-2005 and 0.01 mm with the optional linear guides
- Standard taper cutting of plus or minus 6 degrees over 80 mm with 15 30 and 45 degree options
- Best surface roughness Ra 2.5 micrometres in a single cut reduces hand finishing on die work
- Non-standard working sizes built to order from DK7740 up to DK77120 and larger
Where Auto Wire Cutter DK7745 EDM Earns Its Place
Problems It Solves
- Hardened steel cannot be profiled by conventional cutters after heat treatment
- Cutting force from milling distorts thin slender and slotted parts
- Complex internal contours have no practical tool path with rotating cutters
- Axis backlash loses profile accuracy on parts with tight tolerances
- Die clearance and relief angles are difficult to produce without taper cutting
- Rough EDM surfaces add hand polishing time that a Ra 2.5 micrometre single cut reduces
Who It Is For
- Die and mould makers cutting punches dies and inserts
- Tooling departments inside stamping and forging plants
- Precision subcontract machine shops offering wire EDM as a service
- Prototype workshops needing complex profiles in small numbers
- Machinery distributors supplying tool rooms in export markets
Application Scenarios
- Cutting punch and die sets for stamping tools from hardened steel
- Producing carbide inserts drawing dies and wear parts
- Cutting extrusion and profile dies with internal contours
- Making gear and sprocket prototypes where the form is too small to hob
- Cutting tapered relief on blanking dies using the taper function
- Separating and profiling hardened parts already heat treated to final hardness
Technical Detail
Technical Features
- High precision V-shaped guide rails with linear guide rails optional
- P3-grade high precision ball screws on the driven axes
- Standard maximum cutting taper plus or minus 6 degrees over 80 mm
- Optional taper capability of plus or minus 15 30 and 45 degrees
- Positioning precision within 0.02 mm to GB7926-2005 and 0.01 mm with linear guides
- Best surface roughness Ra 2.5 micrometres on a single cut
- Molybdenum wire of 0.1 to 0.2 mm diameter running in a water-based emulsion
- Non-standard models DK7740(45)F DK7750(55)F DK7763F DK7780F DK77100F and DK77120F available
- CNC middle speed wire cut models available with precision within plus or minus 0.005 mm and roughness within 1.0 micrometre
Specifications
| Machine type | CNC wire cut EDM machine |
|---|---|
| Models | DK7745 within the DK77 series |
| Standard maximum cutting taper | ±6°/80 mm with ±15° ±30° and ±45° optional |
| Precision | ≤0.02 mm to GB7926-2005 and 0.01 mm with linear guide rails |
| Best surface roughness | Ra 2.5 μm single cut |
| Guideways | High precision V-shaped guide rails linear guide rails optional |
| Ball screws | P3-grade high precision |
| Molybdenum wire diameter | 0.1-0.2 mm |
| Working fluid | Water-based emulsion |
| Power | 1.5 kW |
Figures above are taken from the product information we hold. Send us your application and we will confirm the exact specification for the model quoted.
How It Is Built and What Can Be Changed
Operations Performed
- Wire cut EDM profiling
- Taper cutting
- Internal contour cutting
- Die and punch cutting
Materials Handled
- Hardened tool steel
- Carbide
- Other electrically conductive metals
Quality Control
- Axis positioning checked against GB7926-2005 before shipment
- Ball screw and guide rail alignment verified on assembly
- Wire running system checked for tension and steady travel through a full cycle
- Test profile cut and measured for accuracy and surface roughness
- Working fluid and filtration circuit checked for flow and leaks
Customisation Options
- Machine size built to your working dimensions including non-standard models beyond DK77120F
- Linear guide rails specified where 0.01 mm positioning is required
- Taper unit selected from ±6° ±15° ±30° or ±45° for your die relief angles
- CNC middle speed version specified where ±0.005 mm and roughness within 1.0 μm are needed
- Supply voltage frequency and operating language set for your market
How It Compares With the Alternatives
| Standard DK77 machine with V-shaped guide rails | V-rail machines hold precision within 0.02 mm; fitting the optional linear guide rails takes that to 0.01 mm, which is the choice when you cut close-tolerance die sets |
|---|---|
| CNC middle speed wire cut EDM | The middle speed machines reach precision within ±0.005 mm and roughness within 1.0 μm using multiple cuts; the standard fast wire machine is the lower-cost route where a single cut at Ra 2.5 μm is enough |
| Milling and grinding hardened die components | Conventional cutters lose to hardened material and cannot reach sharp internal corners; wire EDM cuts the profile after heat treatment with no cutting force on the part |
Running the Machine
Step 1
Prepare the cut profile as a CNC program and check the start hole position on the part
Step 2
Mount and level the workpiece and ensure a clean electrical contact for the work circuit
Step 3
Thread the molybdenum wire and set the wire tension and running speed
Step 4
Fill and check the water-based emulsion level and flushing at the cutting zone
Step 5
Set the taper angle where relief is required and confirm the upper guide position
Step 6
Run the profile and check the first part for size and surface finish before continuing
Step 7
Keep the emulsion filtered and change it on schedule to hold cutting stability and surface finish
Questions About Auto Wire Cutter DK7745 EDM
What taper can the machine cut?
Standard maximum cutting taper is plus or minus 6 degrees over 80 mm. Plus or minus 15 30 and 45 degree swing large taper versions are available. Tell us your relief angle and part height.
What accuracy can I expect?
Precision is within 0.02 mm according to GB7926-2005. With the linear guide rail option fitted the precision reaches 0.01 mm. Our CNC middle speed machines reach within plus or minus 0.005 mm.
What surface finish does a single cut give?
Best surface roughness on a single cut is Ra 2.5 micrometres. The middle speed machines reach roughness within 1.0 micrometre using multiple cuts.
What wire and working fluid does it use?
Molybdenum wire of 0.1 to 0.2 mm diameter running in a water-based emulsion.
Can you build a larger working size than DK7745?
Yes. Non-standard models including DK7740(45)F DK7750(55)F DK7763F DK7780F DK77100F and DK77120F are produced, and larger sizes can be built. Send us your maximum workpiece dimensions.
What power supply does the machine need?
Machine power is 1.5 kW. Tell us your supply voltage frequency and phase and we will build it to your market.
What are your trade and payment terms?
FOB CFR and CIF are available. Payment is 30 percent by T/T on order and 70 percent before shipment, or an irrevocable L/C at sight.
Request a Quote on the Auto Wire Cutter DK7745 EDM
Send us the work you need it to do, the voltage on your site and the port you ship to. We will come back with the model, the tooling and the lead time.