CN108356373B - Curved blind hole processing device and curved method for processing blind hole - Google Patents

Abstract

A curved blind hole processing device and a curved blind hole processing method are used for processing curved blind holes on a workpiece. The curved blind hole processing device comprises a tool electrode arranged opposite to the workpiece and used for processing the workpiece, used for clamping A driver that drives the tool electrode to rotate relative to the workpiece, and a pulse power source that is electrically connected to the workpiece and is also electrically connected to the tool electrode and used to provide pulse electricity. The tool electrode includes a clamp for the driver to be clamped and electrically connected to the pulse power source. A segment and a discharge segment arranged in an arc shape, the first end of which is electrically connected to the clamping segment and the second end of which is used for generating electric sparks between the workpiece and the workpiece. The invention can process a plurality of curved blind holes on the workpiece surface at one time, and has high precision and high efficiency.

Description

Curved blind hole processing device and curved blind hole processing method

technical field

The invention belongs to the field of electrical discharge machining, and in particular relates to a curved blind hole machining device and a machining method.

Background technique

At present, curved blind holes are opened on workpieces. In actual production, conductive workpieces such as die steel need to be processed inside the mold. However, it is difficult to process fine and high-precision curved blind holes on the workpiece with the existing methods, resulting in There is a problem of low precision in the machining of curved blind holes.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a curved blind hole processing device, which aims to solve the problem of low precision in curved blind hole processing.

The present invention is realized as follows: a curved blind hole machining device for machining curved blind holes on a workpiece, comprising a tool electrode arranged opposite the workpiece and used for machining the workpiece, a tool electrode for clamping and driving the workpiece A driver for rotating the tool electrode relative to the workpiece and a pulse power supply electrically connected to the workpiece and also electrically connected to the tool electrode and used to provide pulse electricity, the tool electrode includes a driver for clamping A clamping segment electrically connected to the pulse power supply and an arc-shaped arrangement with its first end electrically connected to the clamping segment and its second end for generating spark discharge with the workpiece part.

Further, the shape of the discharge section is an annular arc, the outer diameter of the discharge section is 5-30 mm, and the inner diameter of the discharge section is 4-29.5 mm.

Further, the angle of the central angle corresponding to the discharge segment is greater than 0 degrees and less than 270 degrees, and the center of the circle corresponding to the discharge segment is located on the central axis of the clamping segment.

Further, the tool electrode further includes a connecting section connecting the discharge section and the clamping section and parallel to the central axis of the clamping section, and one end of the connecting section is connected to the clamping section, so The other end of the connection section is connected to the first end of the discharge section, and the second end of the discharge section faces the machined surface of the workpiece.

Further, one end of the connecting segment connected to the clamping segment is located on the end face of the clamping segment facing the workpiece.

Further, the curved blind hole machining device further includes a fixing fixture for fixing the workpiece, a fixing groove is formed on the surface of the fixing fixture facing the tool electrode, and one end of the workpiece is fixed in the fixing groove. Inside, the fixing jig comprises a floor plate arranged flat and two side plates arranged oppositely and fixed on the floor plate, and the floor plate and the two side plates are encircled to form the fixing groove.

Further, the following processing steps are included:

Further, prepare the curved blind hole processing device as described above;

Further, immersing the workpiece in a working fluid for cooling the workpiece and removing chips and placing it in a predetermined position to form a discharge circuit between the workpiece, the tool electrode and the pulse power supply;

Further, a fine electric spark discharge is generated between the discharge section and the workpiece to erode and process the workpiece, and the driver drives the tool electrode to rotate.

Further, the material of the workpiece is die steel, and the material of the tool electrode is red copper.

Further, the pulse voltage of the pulse power supply is 70-220V, and the pulse width of the pulse power supply is 1-100 μs.

Further, the rotational speed of the driver is 60-6000 n/min, the feeding speed of the driver is 1-10 μm/n, and the retracting speed of the driver is 1-10 μm/n.

Compared with the prior art, the technical effect of the present invention is that the tool electrode, the workpiece and the pulse power supply together form an electric spark discharge circuit. The driver drives the tool electrode to rotate relative to the workpiece, and the arc-shaped discharge segment can continuously erode and process the workpiece through electric sparks generated between the workpiece and the workpiece, thereby machining a high-precision curved blind hole on the workpiece.

Description of drawings

FIG. 1 is a schematic structural diagram of a curved blind hole processing device provided by an embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a tool electrode of the curved blind hole machining device of FIG. 1 .

FIG. 3 is a cross-sectional view of the workpiece of the curved blind hole machining device of FIG. 1 along its central axis.

FIG. 4 is a schematic structural diagram of a fixing fixture of the curved blind hole machining device of FIG. 1 .

The corresponding relationship between the labels and names in the accompanying drawings is as follows:

name label name label Curved blind hole machining device 100 clamping section twenty one workpiece 50 Curved blind hole 51 Tool electrode 20 connection segment twenty two driver 10 Fixing fixture 30 first end 231 bottom plate 31 second end 232 first side panel 32 discharge section twenty three second side panel 33 Fixed slot 40

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "thickness", "upper", "lower", "perpendicular", "parallel", "bottom", "angle", etc. is based on the attached The orientation or positional relationship shown in the figures is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a reference to the present invention. Invention limitations.

In the present invention, unless otherwise expressly specified and limited, terms such as "installation" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated; The connection can also be an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between two elements or the interaction relationship between the two elements.

Referring to FIGS. 1 to 2 , a curved blind hole machining device 100 provided by an embodiment of the present invention is used for machining a curved blind hole 51 on a workpiece 50 . The curved blind hole machining device 100 includes the The workpiece 50 is disposed opposite to the tool electrode 20 for processing the workpiece 50, the driver 10 for clamping and driving the tool electrode 20 to rotate relative to the workpiece 50, and the workpiece 50 and the The tool electrode 20 is electrically connected to a pulse power supply (not shown) for supplying pulse electricity, the tool electrode 20 includes a clamping section 21 for clamping the driver 10 and electrically connected to the pulse power supply, and a clamping section 21 in the form of a The discharge section 23 is arc-shaped and the first end 231 of which is electrically connected to the clamping section 21 and the second end 232 is used for generating electric sparks between the workpiece 50 and the workpiece 50 . Specifically, in this embodiment, the driver 10 is a numerically controlled machine tool, and the rotational speed of the spindle of the numerically controlled machine tool is 60-6000 rpm.

The tool electrode 20, the workpiece 50 and the pulse power supply together form an electric spark discharge circuit. The driver 10 drives the tool electrode 20 to rotate relative to the workpiece 50 , and the arc-shaped discharge segment 23 can continuously erode and process the workpiece 50 by the electric spark generated between it and the workpiece 50 , thereby machining the workpiece 50 with high precision. The curved blind hole 51.

Specifically, the tool electrode 20 in this embodiment is red copper with a wide range of sources and good conductivity. The discharge segment 23 can be processed into a desired shape by processing methods such as laser or wire cutting. The shape of the discharge section 23 is an annular arc, the outer diameter of the discharge section 23 is 5-30 mm, and the inner diameter of the discharge section 23 is 4-29.5 mm. Specifically, the shape of the cross section of the discharge segment 23 may be a circle, an ellipse, a triangle or a square, etc. The specific shape may be determined according to the requirements of the curved blind hole 51 to be processed. Preferably, in this embodiment, the shape of the cross section of the discharge section 23 is a rectangle, the outer diameter of the discharge section 23 is 20mm, the inner diameter of the discharge section 23 is 19mm, and the curved shape processed by the discharge section 23 The cross-sectional shape of the blind hole 51 is correspondingly a rectangle.

The angle range of the central angle corresponding to the discharge segment 23 is greater than 0 degrees and less than 270 degrees. The center of the circle corresponding to the discharge segment 23 is located on the central axis (not shown) of the clamping segment 21 . Specifically, the central angle of the curved blind hole 51 processed by the discharge section 23 is also located on the central axis, and the angle range of the central angle of the curved blind hole 51 is 0 to 180 degrees. Preferably, the central angle of the curved blind hole 51 corresponding to the discharge segment 23 in this embodiment is 75 degrees.

The tool electrode 20 further includes a connecting segment 22 that connects the discharge segment 23 and the clamping segment 21 and is parallel to the central axis of the clamping segment 21 , and one end of the connecting segment 22 is connected to the clamping segment 21 . In the segment 21 , the other end of the connection segment 22 is connected to the first end 231 of the discharge segment 23 , and the second end 232 of the discharge segment 23 faces the machined surface of the workpiece 50 . In this embodiment, only one section of the discharge section 23 is provided on the connecting section 22. In other embodiments, a plurality of discharge sections 23 may be arranged in parallel, so that a plurality of the curved blind sections can be simultaneously machined on the workpiece 50 at one time. hole 51.

The connecting section 22 also electrically conducts the clamping section 21 and the discharge section 23, and the space relative position of the discharge section 23 and the clamping section 21 can be adjusted through the connecting section 22, thereby facilitating the bending of the discharge section 22. Processing of blind hole 51. Specifically, the connecting section 22 is parallel to the central axis and is perpendicular to the plane where the discharge section 23 is located, so that a horizontally arranged curved blind hole 51 can be machined on the workpiece 50 . When the connecting section 22 has a predetermined angle with the central axis, an inclined curved blind hole 51 can be machined on the workpiece 50 . Therefore, the processing of the curved blind hole 51 which cannot be used can be satisfied. One end of the connecting section 22 connected to the clamping section 21 may be connected to a side wall or an end surface of the clamping section 21 . Preferably, in this embodiment, one end of the connecting section 22 connected to the clamping section 21 is located on the end surface of the clamping section 21 facing the workpiece 50 .

Please refer to FIGS. 3 to 4 at the same time, the curved blind hole machining device 100 further includes a fixing fixture 30 for fixing the workpiece 50 , and a fixing groove 40 is defined on the surface of the fixing fixture 30 facing the tool electrode 20 . , one end of the workpiece 50 is fixed in the fixing groove 40, and the fixing fixture 30 includes a bottom plate 31 arranged flatly and two side plates arranged oppositely and fixed on the bottom plate 31. The panel includes a first side panel 32 and a second side panel 33 disposed opposite to the first side panel 32 . The bottom plate 31 and the two side plates form the fixing groove 40 .

For better understanding of the device, this embodiment also provides a method for processing a curved blind hole. The following processing steps are included:

Prepare the curved blind hole processing device 100 as described above;

The workpiece 50 and the fixing jig 30 are immersed in a working fluid (not shown) for cooling the workpiece 50 and removing chips and placed at predetermined positions so that the workpiece 50, the tool electrode 20 and the A discharge loop is formed between the pulse power sources;

A fine electric spark erosion is generated between the discharge section 23 and the workpiece 50 to process the workpiece 50 , and the driver 10 drives the tool electrode 20 to rotate.

According to the radian and horizontal angle of the processed curved blind hole 51 , the distance from the discharge section 23 of the tool electrode 20 to the machined surface of the workpiece 50 and the angle between the machined surface and the second end 232 of the discharge section 23 are selected. According to the position of the processed curved blind hole 51 , the relative position of the second end 232 of the discharge segment 23 and the workpiece 50 is selected.

Specifically, in this embodiment, the workpiece 50 is a long tube with a vertical arrangement and a square cross-section, and the material of the workpiece 50 is die steel. One side edge 51 of the workpiece 50 is on the same straight line with the central axis (not shown) of the main shaft 11 of the CNC machine tool.

The tool electrode 20 is lowered to the machining position along the spindle axis of the CNC machine tool and the tool is set. In the present invention, the feeding method of the tool electrode 20 is rotary feeding, the feeding direction is the a direction shown in FIG. 1 , and the retracting direction is the b direction shown in FIG. 1 . Specifically, the feed speed range of the CNC machine tool spindle is 1-10 μm/n, and the retracting speed range is 1-10 μm/n. Since the present invention processes fine curved blind holes 51 by EDM, the slag removal effect is poorer than that of ordinary EDM, so the feed rate a and retraction speed b should be selected as large values as far as possible under the condition that the machining requirements are met. , which is conducive to slag discharge and processing.

In this embodiment, the pulse voltage of the pulse power supply is 70-220V, and the pulse width of the pulse power supply is 1-100 μs. The surface roughness Ra of the processed curved blind hole 51 is in the range of 0.2 to 1.5 μm.

The curved blind hole machining device 100 and the curved blind hole machining method provided by the embodiment of the present invention have relatively wide adaptability, and can process various curved blind holes 51 on the surface of the workpiece 50 . The loss of the tool electrode 20 is less, and a plurality of curved blind holes 51 can be machined side by side at one time, which greatly improves the machining efficiency and has high machining accuracy.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection of the present invention. within the range.

Claims (10)

1. a kind of curved blind hole processing device, for processing curved blind hole on workpiece, it is characterised in that: including with the workpiece It is oppositely arranged and is used to process the tool-electrode of the workpiece, for clamping and driving the relatively described workpiece of the tool-electrode to turn It dynamic driver and is electrically connected and is also electrically connected with the tool-electrode and electric for providing pulse with the workpiece The pulse power, the tool-electrode include for the driver clamp and with the pulse power be electrically connected gripping section and Arc-shaped setting and its first end are electrically connected at the gripping section and its second end is used to generate electrical fire between the workpiece Colored electric discharge section, workpiece fixed setting, the shape of the electric discharge section are the described of one section of annular circular arc and arc-shaped setting The electric spark generated between electric discharge section and the workpiece constantly corrodes and processes the workpiece.

2. curved blind hole processing device as described in claim 1, it is characterised in that: the shape of the electric discharge section is one section of annular The outer diameter of circular arc, the electric discharge section is 5~30mm, and the internal diameter of the electric discharge section is 4~29.5mm.

3. curved blind hole processing device as claimed in claim 2, it is characterised in that: central angle corresponding to the electric discharge section Angle is greater than 0 degree and less than 270 degree, and the center of circle corresponding to the electric discharge section is located on the central axis of the gripping section.

4. curved blind hole processing device as claimed in claim 3, it is characterised in that: the tool-electrode further includes parallel described The linkage section of the central axis of gripping section, one end of the linkage section connect the gripping section, the linkage section it is another End connection it is described electric discharge section first end, it is described electric discharge section second end towards the workpiece surface to be machined.

5. curved blind hole processing device as claimed in claim 4, it is characterised in that: the linkage section connects the gripping section One end is located at the gripping section towards the end face of the workpiece.

6. the curved blind hole processing device as described in claim 1-5 any one, it is characterised in that: the curved blind hole machining Device further includes the stationary fixture for fixing the workpiece, and the surface of the stationary fixture towards the tool-electrode offers Fixing groove, one end of the workpiece are fixed in the fixing groove, and the stationary fixture includes the bottom plate and two of tiling setting The side plate that block is oppositely arranged and is fixed on the bottom plate, the bottom plate and two blocks of side plates surround to form the fixing groove.

7. a kind of curved method for processing blind hole, it is characterised in that: including following procedure of processing:

Device preparation process: prepare such as curved blind hole processing device described in any one of claims 1 to 6；

Workpiece initialization step: the workpiece is immersed in cooling down workpiece and the working solution of chip removal and to be placed on scheduled position It sets so as to form discharge loop between the workpiece, the tool-electrode and the pulse power；

Work pieces process step: fine electric spark electric discharge is generated between the electric discharge section and the workpiece to corrode and process the work Part, the driver drive the tool-electrode rotation.

8. curved method for processing blind hole as claimed in claim 7, it is characterised in that: the material of the workpiece is mould steel, institute The material for stating tool-electrode is red copper.

9. curved method for processing blind hole as claimed in claim 7, it is characterised in that: the pulse voltage of the pulse power is 70 ~220V, the pulse width of the pulse power are 1~100 μ s.

10. curved method for processing blind hole as claimed in claim 7, it is characterised in that: the revolving speed of the driver is 60~ 6000 revs/min, the feed speed of the driver is 1~10 μm/n, and the rollback speed of the driver is 1~10 μm/n.