Electric spark numerical control wire cutting machine for mold machining

Abstract

An electric spark numerical control wire cutting machine for die machining comprises a base, a wire conveying mechanism, a wire frame and a workbench, and the wire conveying mechanism, the wire frame and the workbench are arranged on the base. A molybdenum wire pulled out by a wire cylinder of the wire conveying mechanism sequentially passes through the stand column, the upper cantilever, the lower cantilever and a wire guide roller on the stand column and then is wound back to the wire cylinder, and the lower side of the upper cantilever is provided with a constant force tensioning structure aiming at the molybdenum wire. The constant force tensioning structure comprises a vertical strip hole support and a gravity tensioning wheel arranged in a vertical strip hole of the vertical strip hole support in a rotating and sliding mode through rotating shafts at the two ends, an annular guide groove corresponding to the molybdenum wire is formed in the outer ring of the gravity tensioning wheel, and the section, on the lower side of the outer ring of the gravity tensioning wheel, of the annular guide groove abuts against the molybdenum wire. According to the electric spark numerical control cutting machine, a simple constant-force tensioning structure with constant tensioning force is provided for the cutting wire, the service life of the cutting wire can be effectively prolonged, and the cutting precision is guaranteed.

Description

Technical Field

[0001] The utility model relates to a mold processing electric spark numerical control wire cutting machine, belonging to the technical field of electric spark machines. Background Art

[0002] The wire tensioning structure of the traditional EDM machine is generally as shown in the Chinese utility model patent "Authorization Announcement No.: CN206717214U; Authorization Announcement Date: December 8, 2017; Name: Fully Enclosed Environmentally Friendly EDM Medium Wire Cutting Machine Tool". Its tensioning structure includes a movable leg and a tensioning wheel rotatably arranged at the end of the movable leg. The movable leg is slidably arranged in a sleeve through a spring. Although this tensioning structure has the function of automatic telescopic adjustment, its tensioning force on the wire is variable and cannot provide a constant tensioning force for the wire. When the tightness of the wire changes, it will affect the cutting accuracy and service life of the wire. In addition, the traditional EDM machine also has the defects of difficult operation and low efficiency of the electrode fixing device as shown in another Chinese utility model patent "Authorization Announcement No.: CN205085512U; Authorization Announcement Date: March 16, 2016; Name: EDM Machine Electrode Fixing Tool". Utility Model Content

[0003] The purpose of the utility model is to provide a mold processing electric spark CNC wire cutting machine in view of the above-mentioned defects of the prior art. The electric spark CNC wire cutting machine solves the defects of the wire tensioning device in the traditional electric spark machine providing an unstable tensioning force, resulting in short cutting accuracy and wire service life, and the electrode fixing device in the traditional electric spark machine is difficult to operate and has low efficiency. The utility model greatly improves the cutting accuracy of the electric spark machine and the service life of the cutting wire, solves the defects of the electrode replacement operation being difficult and inefficient, and has outstanding practicality.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A CNC electric spark wire cutting machine for mold processing comprises a base, a wire conveying mechanism, a wire rack and a workbench arranged on the base, the wire rack comprises a column, an upper cantilever and a lower cantilever arranged on the column, the molybdenum wire pulled out by the wire drum of the wire conveying mechanism passes through the column, the upper cantilever, the lower cantilever and the wire guide roller on the column in sequence and then winds back to the wire drum, a constant force tensioning structure is arranged for the molybdenum wire on the lower side of the upper cantilever, the constant force tensioning structure comprises a vertical bar hole bracket and a gravity tensioning wheel which is arranged in the vertical bar hole of the vertical bar hole bracket by rotating and sliding with rotating shafts at both ends, the outer ring of the gravity tensioning wheel is provided with an annular guide groove corresponding to the molybdenum wire, and the annular guide groove on the lower side of the outer ring of the gravity tensioning wheel abuts against the molybdenum wire.

[0006] By adopting the above technical solution, the CNC electric spark cutting machine provides a simple constant force tensioning structure with constant tensioning force for the cutting wire, which can effectively ensure the extension of the service life of the cutting wire and ensure the cutting accuracy.

[0007] The utility model is further configured as follows: the vertical bar hole bracket is composed of two U-shaped hangers arranged side by side, the gravity tensioning wheel is located between the two U-shaped hangers, and the rotating shafts at both ends of the gravity tensioning wheel are in a sliding fit relationship with the vertical bar holes of the U-shaped bracket.

[0008] By adopting the above technical solution, the specific solution of the constant force tensioning structure is limited. The constant force tensioning structure is simple and reliable and has the advantage of low cost.

[0009] The utility model is further configured as follows: an electrode fixing device is arranged at the front end of the upper cantilever, the electrode fixing device comprises a clamping rod and an electrode rod axially arranged in the axial inner hole of the lower section of the clamping rod, a plurality of elastic clips are equidistantly arranged at the edge of the lower opening of the axial inner hole of the cylinder, a locking screw sleeve is sleeved on the lower end of the cylinder, the lower opening of the screw hole of the locking screw sleeve is arranged with an annular locking retaining ring corresponding to the outer side wall of the elastic clip, the lower section of the locking screw sleeve is spirally arranged with an electrode moving screw sleeve, and the lower section of the inner hole of the electrode moving screw sleeve is arranged with an annular clamping piece corresponding to the electrode rod.

[0010] By adopting the above technical solution, a CNC wire-cut electric spark cutting machine for mold processing is provided. When the electrode fixing device provided by the CNC electric spark cutting machine moves the electrode downward after the electrode is worn out, the worker only needs to rotate the locking screw sleeve and the electrode moving screw sleeve respectively according to the steps, and there is no need to consider the misalignment between the electrode and the clamping rod when the electrode is moved. In addition, the adjustment method of the spiral also makes it easier for the worker to control the vertical precise movement of the electrode. The electrode fixing device reduces the difficulty of the worker's operation and improves the assembly efficiency.

[0011] The utility model is further configured as follows: the electrode moving screw sleeve is spirally installed in the annular groove on the lower end surface of the locking screw sleeve.

[0012] The utility model is further configured as follows: the outer side wall of the annular groove is provided with an inner thread which matches with the outer thread of the upper section of the outer side wall of the electrode moving screw sleeve.

[0013] By adopting the above technical solution, a larger operating space is provided for the outer side wall of the locking screw sleeve, the vertical structure of the locking screw sleeve can be designed to be shorter, the vertical space occupied by the locking screw sleeve can be reduced to a greater extent, and a wider design and placement space is provided for other components.

[0014] The utility model is further configured as follows: the annular clamping piece is composed of a coaxially arranged large rubber ring, a small rubber ring, and radial rubber rods equally arranged between the large rubber ring and the small rubber ring.

[0015] By adopting the above technical solution, a specific annular clamp is provided, which has good radial deformation ability.

[0016] The utility model is further configured as follows: the inner surface of the annular locking retaining ring is an annular inclined surface with a low inner ring hole edge and a high outer ring edge.

[0017] By adopting the above technical solution, the specific structure of the inner surface of the annular locking retaining ring is limited.

[0018] The utility model is further configured as follows: an upper section of the outer side wall of the locking screw sleeve is provided with an anti-slip structure which facilitates rotation.

[0019] The utility model is further configured as follows: the lower section of the outer side wall of the electrode moving screw sleeve is also provided with an anti-slip structure for facilitating rotation.

[0020] By adopting the above technical solution, anti-slip structures are provided on the outer wall of the locking screw sleeve and the outer wall of the electrode moving screw sleeve, which can effectively improve the convenience of rotating the two.

[0021] The utility model is further configured as follows: the upper end of the clamping rod is detachably fixed on the fixed connecting piece, and the connecting piece is fixed on the front end of the upper cantilever.

[0022] By adopting the above technical solution, the upper end of the clamping rod is detachably fixed to the fixed connecting piece, which facilitates the installation, disassembly and maintenance of the clamping rod.

[0023] The main beneficial effects of the utility model are:

[0024] 1. This new CNC EDM cutting machine provides a simple and constant tensioning structure for the cutting wire, which can effectively extend the service life of the cutting wire and ensure cutting accuracy;

[0025] 2. The electrode fixing device provided by the new CNC EDM cutting machine allows workers to vertically adjust and install the electrode rod by rotating the locking screw sleeve and the electrode moving screw sleeve in steps, which effectively reduces the operating difficulty of workers and effectively improves assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a structural schematic diagram of the utility model;

[0028] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0029] Figure 3 It is a schematic diagram of the structure of the appearance of the electrode fixing device in the utility model;

[0030] Figure 4 It is a schematic diagram of the structure inside the electrode fixing device of the utility model;

[0031] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0032] In the figure, 1, base; 2, 3, molybdenum wire; 4, column; 5, upper cantilever; 6, lower cantilever; 7, electrode fixing device; 71, connecting piece; 711, axial opening; 72, connecting nut; 73, clamping rod; 731, axial plug plate; 732, upper end baffle; 733, cylinder; 734, elastic clip; 74, locking screw sleeve; 741, annular groove; 75, electrode moving screw sleeve; 761, large rubber ring; 762, radial rubber rod; 763, small rubber ring; 77, electrode rod; 8, workbench; 9, wire guide roller; 101, U-shaped hanger; 102, gravity tensioning wheel; 103, rotating shaft. DETAILED DESCRIPTION

[0033] The technical solution of the utility model will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] Embodiment 1:

[0035] like Figures 1 to 5As shown, a mold processing electric spark CNC wire cutting machine includes a base 1 and a wire conveying mechanism, a wire rack and a workbench 8 arranged on the base 1, the wire rack includes a column 4 and an upper cantilever 5 and a lower cantilever 6 arranged on the column 4, the molybdenum wire 3 pulled out by the wire drum 2 of the wire conveying mechanism passes through the column 4, the upper cantilever 5, the lower cantilever 6 and the wire guide roller 9 on the column 4 in sequence and then winds back to the wire drum 2, the lower side of the upper cantilever 5 is provided with a constant force tensioning structure for the molybdenum wire 3, the constant force tensioning structure includes a vertical bar hole bracket and a gravity tensioning wheel 102 that is rotatably and slidingly arranged in the vertical bar hole of the vertical bar hole bracket using rotating shafts 103 at both ends, the outer ring of the gravity tensioning wheel 102 is provided with an annular guide groove corresponding to the molybdenum wire, and the annular guide groove on the lower side of the outer ring of the gravity tensioning wheel 102 abuts against the molybdenum wire 3. The vertical bar hole bracket is composed of two U-shaped hangers 101 arranged side by side, and the gravity tensioning wheel 102 is located between the two U-shaped hangers 101. The rotating shafts 103 at both ends of the gravity tensioning wheel 102 are in a sliding fit relationship with the vertical bar holes of the U-shaped bracket 101.

[0036] The front end of the upper cantilever 5 is provided with an electrode fixing device 7, which includes a clamping rod 73 and an electrode rod 77 axially arranged in the axial inner hole of the lower cylinder 733 of the clamping rod 73. The upper end of the clamping rod 73 is detachably fixed to the fixed connecting member 71 (specifically, after the axial opening 711 at the lower end of the connecting member 71 is matched with the axial plug plate 731 at the upper end of the clamping rod 73, the annular seal at the lower hole of the connecting nut 72 is located on the lower side of the baffle plate 732 at the upper end of the clamping rod, and the upper screw hole of the connecting nut 72 is spirally matched with the external thread at the lower end of the connecting member 71, so as to realize the fixing of the connecting member 71). The connecting piece 71 is fixed to the front end of the upper cantilever 5, and the edge of the lower hole of the axial inner hole of the cylinder 733 is equidistantly provided with a plurality of elastic clips 734, and the lower end of the cylinder 733 is sleeved with a locking screw sleeve 74, and the lower hole of the screw hole of the locking screw sleeve 74 is provided with an annular locking retaining ring corresponding to the outer wall of the elastic clip 734, and the inner surface of the annular locking retaining ring is an annular inclined surface with a low inner ring hole edge and a high outer ring edge, and the lower section of the locking screw sleeve 74 is spirally provided with an electrode moving screw sleeve 75, and the lower section of the inner hole of the electrode moving screw sleeve 75 is provided with an annular clamping piece corresponding to the electrode rod 77. The electrode moving screw sleeve 75 is spirally installed in the annular groove 741 on the lower end surface of the locking screw sleeve 74, and the outer side wall of the groove 741 is provided with an internal thread matched with the external thread of the upper section of the outer side wall of the electrode moving screw sleeve 75. The annular clamping member is composed of a coaxially arranged large rubber ring 761, a small rubber ring 763, and a radial rubber rod 762 equally disposed between the large rubber ring 761 and the small rubber ring 763. The upper section of the outer side wall of the locking screw sleeve 74 is provided with an anti-slip structure for easy rotation, and the lower section of the outer side wall of the electrode moving screw sleeve 75 is also provided with an anti-slip structure for easy rotation.

[0037] How it works:

[0038] When the tightness of the molybdenum wire 3 changes, the gravity tensioning wheel 102 moves up or down synchronously to provide a constant tensioning force for the molybdenum wire 3 to ensure cutting accuracy.

[0039] When the locking screw sleeve 74 moves downward to release the locking of the elastic clip 734 and the annular clamp moves downward to disengage from the elastic clip 734, the inner diameter of the annular clamp rebounds and shrinks to clamp the electrode rod 77. At this time, the locking screw sleeve 74 is fixed, and only the electrode moving screw sleeve 75 is rotated, and the annular clamp can drive the electrode rod 77 to move downward steadily; when the electrode rod 77 is lowered to a suitable position, the electrode moving screw sleeve 75 is fixed, and the locking screw sleeve 74 is spirally moved upward to make the elastic clip 734 clamp and fix the electrode rod 77, and finally the electrode moving screw sleeve 75 is spirally moved upward until the annular clamp is sleeved on the outer side of the locked elastic clip 734, and at this time, the electrode moving screw sleeve 75 is moved upward, and the electrode rod 77 no longer moves upward synchronously with the electrode moving screw sleeve 5.

Claims

1. A CNC wire-cut electric discharge machine for mold processing, comprising a base (1) and a wire conveying mechanism, a wire rack and a workbench (8) arranged on the base (1), wherein the wire rack comprises a column (4) and an upper cantilever (5) and a lower cantilever (6) arranged on the column (4), and a molybdenum wire (3) drawn out from a wire drum (2) of the wire conveying mechanism passes through the column (4), the upper cantilever (5), the lower cantilever (6) and a wire guide roller (9) on the column (4) in sequence and then winds back to the wire drum (2), characterized in that: A constant force tensioning structure is arranged on the lower side of the upper cantilever (5) for the molybdenum wire (3), and the constant force tensioning structure comprises a vertical bar hole bracket and a gravity tensioning wheel (102) which is arranged in the vertical bar hole of the vertical bar hole bracket by rotating and sliding with rotating shafts (103) at both ends, and the outer ring of the gravity tensioning wheel (102) is provided with an annular guide groove corresponding to the molybdenum wire, and the annular guide groove on the lower side of the outer ring of the gravity tensioning wheel (102) abuts against the molybdenum wire (3).

2. The mold processing electric spark CNC wire cutting machine according to claim 1, characterized in that: The vertical bar hole bracket is composed of two U-shaped hangers (101) arranged side by side, the gravity tensioning wheel (102) is located between the two U-shaped hangers (101), and the rotating shafts (103) at both ends of the gravity tensioning wheel (102) are in a sliding fit relationship with the vertical bar holes of the U-shaped hangers (101).

3. The mold processing electric spark CNC wire cutting machine according to claim 1, characterized in that: The front end of the upper cantilever (5) is provided with an electrode fixing device (7), the electrode fixing device (7) comprising a clamping rod (73) and an electrode rod (77) axially arranged in the axial inner hole of the lower section of the clamping rod (73), a plurality of elastic clips (734) are equidistantly arranged at the mouth edge of the lower opening of the axial inner hole of the cylinder (733), a locking screw sleeve (74) is sleeved on the lower end of the cylinder (733), the lower opening of the screw hole of the locking screw sleeve (74) is provided with an annular locking retaining ring corresponding to the outer wall of the elastic clip (734), the lower section of the locking screw sleeve (74) is spirally provided with an electrode moving screw sleeve (75), and the lower section of the inner hole of the electrode moving screw sleeve (75) is provided with an annular clamping piece corresponding to the electrode rod (77).

4. The mold processing electric spark CNC wire cutting machine according to claim 3 is characterized in that: The electrode moving screw sleeve (75) is screwed into the annular groove (741) on the lower end surface of the locking screw sleeve (74).

5. The mold processing electric spark CNC wire cutting machine according to claim 4, characterized in that: The outer side wall of the annular groove (741) is provided with an inner thread which matches the outer thread of the upper section of the outer side wall of the electrode moving screw sleeve (75).

6. The mold processing electric spark CNC wire cutting machine according to claim 3, characterized in that: The annular clamping member is composed of a coaxially arranged large rubber ring (761), a small rubber ring (763), and a radial rubber rod (762) equally disposed between the large rubber ring (761) and the small rubber ring (763).

7. The mold processing electric spark CNC wire cutting machine according to claim 3, characterized in that: The inner surface of the annular locking retaining ring is an annular inclined surface with a low inner ring hole edge and a high outer ring edge.

8. The mold processing electric spark CNC wire cutting machine according to claim 3, characterized in that: The upper section of the outer side wall of the locking screw sleeve (74) is provided with an anti-slip structure for easy rotation.

9. The mold processing electric spark CNC wire cutting machine according to claim 3, characterized in that: The lower section of the outer side wall of the electrode moving screw sleeve (75) is also provided with an anti-slip structure for facilitating rotation.

10. The mold processing electric spark CNC wire cutting machine according to claim 3, characterized in that: The upper end of the clamping rod (73) is detachably fixed to a fixed connecting member (71), and the connecting member (71) is fixed to the front end of the upper cantilever (5).

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