CN111558751A - CNC wire cutting machining process for combined insert - Google Patents
CNC wire cutting machining process for combined insert Download PDFInfo
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- CN111558751A CN111558751A CN202010344499.3A CN202010344499A CN111558751A CN 111558751 A CN111558751 A CN 111558751A CN 202010344499 A CN202010344499 A CN 202010344499A CN 111558751 A CN111558751 A CN 111558751A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H7/00—Processes or apparatus applicable to both electrical discharge machining and electrochemical machining
- B23H7/02—Wire-cutting
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Abstract
The invention discloses a CNC wire cutting processing technology of a combined insert, which comprises the following processing steps: a, fixing a plurality of insert pairs on a CNC line cutting table to form a central symmetrical integrated part; b, performing line cutting clockwise/anticlockwise on the binding surface of a certain inner insert/outer insert, forming an injection molding groove surface for molding the axial edge of a product on the cut insert, directly performing line cutting on the other insert when the cut insert reaches the other binding surface of the cut insert to form a notch groove, and finishing the line cutting on the cut insert; c, performing line cutting on the adjacent inserts in the line cutting direction of the inserts subjected to line cutting in the step b, and repeating the step b until the line cutting of all the inserts is completed; d, disassembling the integrated part, and respectively performing repair welding on the corner notch groove on each insert to enable the binding surface with the corner notch groove to be smooth again. The invention can overcome the fillet during the wire cutting process, effectively protect the sharp edge and the sharp corner of the product part and ensure the circular concentricity formed by combining the inserts.
Description
Technical Field
The invention relates to the technical field of machining, in particular to the technical field of CNC machining of a combined insert.
Background
There are many machining methods in the machining process, and generally, the machining method can be divided into CNC routing machining, CNC wire cutting machining, grinding machine machining, drilling machine machining and electric spark machining according to different devices.
The principle of CNC wire cutting processing is spark erosion, and its course of working is continuous cutting, meets the circumstances that the cutting route need turn round in CNC wire cutting processing engineering, just must have a fillet, and this fillet minimum also must be the radius size of electrode wire used in the wire cutting processing. According to the CNC wire cutting principle, the wire cutting process mainly depends on the surface of the electrode wire to corrode parts, and the parts are machined according to the shape of the outer surface of the electrode wire in the corrosion process, so that when the machining route is changed, a round angle must exist on the route, and the radius of the round angle is the smallest and needs to be equal to the radius of the electrode wire. In daily machining, the edge round angle of a part needs to be increased under a common condition so as to prevent the wire electrode from being disconnected due to the fact that wire cutting is suddenly corroded and changed in phase in the machining process, and the existing technology cannot be used for machining a sharp-angle right angle by CNC wire cutting.
For a specific cylindrical injection molding product, the whole appearance of the cylindrical injection molding product is a cylinder, axial edges are uniformly arranged inside or outside the circumference, sharp edges are arranged on the axial edges, the sharp edges are side lines without round corners, in the injection molding process, a plurality of identical insert pairs are combined to form an injection molding part according to the mold stripping analysis requirement of the product, as shown in figure 1, each insert pair consists of an inner insert and an outer insert, when the insert pairs are combined, the binding surfaces of the inner insert and the adjacent outer insert are intersected on the same central axis, the angles occupied by the inner insert and the outer insert are the same, the glue position shape combination of the plurality of inserts on the upper surface must ensure the circle center degree of the product and the requirement of the favorable angle on the product, one side of the favorable angle of the product is vertical to the outer circle of the product, and the existing CNC line cutting processing method is used for respectively processing each insert, the concentricity of the combined insert cannot be guaranteed, and the product quality is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the CNC wire cutting processing technology of the combined insert provided by the invention can overcome the fillet in wire cutting processing, effectively protect the sharp edge and sharp corner of a product part and ensure the circular concentricity formed by combining the insert.
According to the first aspect of the invention, the CNC wire cutting machining process of the combined insert comprises the following machining steps: a, fixing a plurality of insert pairs on a CNC line cutting table to form a central symmetrical integrated part; b, performing line cutting clockwise/anticlockwise on the binding surface of a certain inner insert/outer insert, forming an injection molding groove surface for molding the axial edge of a product on the cut insert, directly performing line cutting on the other insert to form a notch groove when the other binding surface of the cut insert is reached, and finishing the line cutting on the cut insert; c, performing line cutting on the adjacent inserts in the line cutting direction of the inserts subjected to line cutting in the step b, and repeating the step b until the line cutting of all the inserts is completed; d, disassembling the integrated part, and respectively performing repair welding on the corner notch groove on each insert to enable the binding surface with the corner notch groove to be smooth again.
The CNC wire cutting machining process of the combined insert provided by the embodiment of the invention at least has the following beneficial effects: the mold inserts for injection molding are combined and fixed and then are processed in a unified manner, so that the circle center degree of the combined mold inserts during combination is ensured, the requirement of the circle center degree of injection molding products is met, the condition that defective products are produced due to insufficient circle center degree of the mold inserts is avoided, the production cost of the mold inserts is reduced, and the requirement of the circle center degree of the combined mold inserts is met; the fillet groove structure is reasonably designed, and then the fillet groove is filled through a repair welding process, so that the problem of fillets formed by the electrode wires in the machining process in the electrode wires is solved, the requirement that the product has right-angle sharp edges can be met under the condition that the combined circle center degree of each insert machined by using a combined machining mode is guaranteed, and the fillets are eliminated.
According to some embodiments of the present invention, in the step b, when the clockwise/counterclockwise wire cutting is started, the wire cutting direction is parallel to the other attaching surface of the cut insert, and the wire cutting is continued clockwise/counterclockwise perpendicular to the other attaching surface of the cut insert after a certain distance of the wire cutting until the other insert is reached.
According to some embodiments of the invention, the method further comprises the following pre-processing steps: cutting a splicing angle on the blank line of the outer insert, half-cutting downwards along the vertex angle line of the splicing angle to form a splicing half angle, and linearly cutting an L-shaped limiting groove when cutting to the inside of the outer insert; cutting the blank of the inner insert, cutting an L-shaped connecting part at the embedding position of the inner insert along the groove surface direction of the L-shaped limiting groove, and cutting an inner half-angle which is matched with the splicing half-angle to form the splicing angle relative to the other end of the L-shaped connecting part.
According to some embodiments of the invention, the integral part is composed of three sets of the insert pairs, each set of the insert pairs having a splice angle of 120 degrees.
According to some embodiments of the invention, in step b, the line cut counter-clockwise is directed away from the central axis and at 60 degrees to the inner/outer insert abutment surfaces.
According to some embodiments of the invention, in the step a, the inner insert is embedded in the outer insert and forms an insert pair with the outer insert, and the insert pair is annularly arranged on the fixed combination line header.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a finished composite insert manufactured according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an integral part blank to be machined according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an integral part cut from the wire in step c according to the embodiment of the present invention;
fig. 4 is a partially enlarged schematic view of a portion B in fig. 3.
Reference numerals:
the insert comprises an insert pair 100, an outer insert 110, an L-shaped limiting groove 111, an inner insert 120, an L-shaped connecting part 121, a sharp corner 200 and a unfilled corner groove 300.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 and 2, a combined insert comprises a plurality of insert pairs 100, each insert pair 100 comprises an inner insert 120 and an outer insert 110, the inner insert 120 is embedded in the outer insert 110, fig. 1 shows that blanks of the insert pairs 100 which are not subjected to line cutting are spliced to form a central symmetrical integral part, so that the concentric machining process of each insert is facilitated. The inner insert 120 and the outer insert 110 form a pieced angle, the inner insert 120 and the outer insert 110 are connected through a limiting structure, an L-shaped connecting portion 121 is arranged on the inner insert 120, an L-shaped limiting groove 111 matched with the connecting portion is arranged on the outer insert 110, and the inner insert 120 and the outer insert 110 are connected through the L-shaped connecting portion 121 and the L-shaped limiting groove 111 to form an insert pair 100. Each insert pair 100 is provided with a splicing angle before on-line cutting processing, the angle of the splicing angle is three hundred sixty degrees except the number of the formed insert pairs 100 so as to adapt to the splicing process of an integrated part, wherein the angle occupied by the inner insert 120 is the same as that occupied by the outer insert 110, namely half of the formed splicing angle, the joint surfaces of the inner insert 120 and the outer insert 110 are intersected on the same axis, and the integrated part is formed by splicing the inner insert 120, the outer insert 110, the inner insert 120- … … and the inner insert 120 in a closed loop mode. This combination mold insert is applied to product injection moulding process, and this product becomes cylindricly, and inside or outside annular evenly is provided with a plurality of axial limits that are on a parallel with its axis, is equipped with sharp limit 200 on this axial limit, and sharp limit 200 is sharp sideline, does not exist the chamfer.
Referring to fig. 3 and 4, a CNC wire cutting process for a composite insert according to an embodiment of the present invention is described below.
The CNC wire cutting machining process of the combined insert is used for the machining process of the combined insert, and comprises the following machining steps:
step a, fixing a plurality of insert pairs 100 on a CNC line cutting table to form a central symmetrical integrated part, wherein the end parts of the plurality of inserts, namely the corner surfaces of the splicing corners, are just mutually attached when the insert pairs are fixed, namely, the inner insert piece 120 of each insert pair 100 is attached to the outer insert piece 110 of the adjacent insert pair 100, and the inner insert piece 120 and the outer insert piece 110 in each insert pair 100 are attached to form a closed structure without gaps, so that the condition of concentric circle degree processing is provided;
b, performing line cutting on the binding surface of a certain inner insert 120/outer insert 110 clockwise/anticlockwise, namely starting from the binding surface between the inner insert 120 and the outer insert 110 in a certain insert pair 100, or starting from the binding surface between the inner insert 120 and the outer insert 110 between two adjacent insert pairs 100, wherein the cut insert can be the inner insert 120 or the outer insert 110, the injection groove surface forming the axial edge of the product is determined according to the line cutting direction, when the cut insert reaches the other binding surface, the cut insert is directly line-cut to the other insert to form a corner-cut groove 300, so that the joint of the injection groove surface of the cut insert and the other insert is not chamfered, and the line cutting process of the cut insert is finished;
c, performing line cutting on the adjacent insert in the line cutting direction of the insert subjected to line cutting in the step b, namely repeating the line cutting processing process in the step b from the other insert in the step b, and after the insert is processed, continuing to process the next insert along the line cutting direction until all the inserts are subjected to line cutting, so as to form an injection molding cavity of the product in the integrated part;
d, disassembling the integrated part, disassembling each insert from the wire cutting table, respectively performing repair welding on the unfilled corner groove 300 on each insert, filling the unfilled corner groove 300 on the binding surface, and reforming a plane, so that the binding surface with the unfilled corner groove 300 is flattened again.
Specifically, in step a, each insert can be clamped on the line header through the clamping table, and also can be tightly pressed on the line header through the pressing piece, so that the tight splicing process of the integrated parts can be realized through manual means, and the tight splicing process can also be realized through a mechanical arm.
In step b, the cutting direction at the beginning of a certain bonding surface in the clockwise/counterclockwise integral part, which is the cutting direction of the counterclockwise sequence of the a-surface in fig. 3, is started from the first insert, i.e., the inner insert 120, and when the cutting line is cut to the outer insert 110 arranged on the counterclockwise side of the cut inner insert 120, the cutting line crosses the bonding surface between the two inserts until reaching the notch 300 formed on the outer insert 110. And c, in the wire cutting process in the step b, the generation of an axial edge fillet is avoided, and the cut insert is cut smoothly.
In step c, in this embodiment, the wire cutting process in step b is sequentially performed on the inserts one by one from the first insert in the counterclockwise direction until the inserts reach the surface a again, and the wire cutting process of all the inserts is completed. It should be noted that the wire electrode for wire cutting is wound around the central axis of the integrated part, and the annular wire cutting process is completed one by one under the numerical control condition of the wire cutting machine.
In step d, repair welding refers to welding performed by repairing defects of the workpiece, and fills the unfilled corner groove 300, so that the attaching surface of the insert is repaired to be an original flat surface, and at the moment, the flat surface is matched with the adjacent insert to form a sharp edge 200, and a fillet is eliminated.
In some embodiments of the present invention, the product of the combined insert has a six-axial-side structure, and the axial sides of the combined insert are right-angled sides, in step b, when the counterclockwise/clockwise line cutting is started, the line cutting direction is parallel to the other attaching surface of the insert to be cut, the line cutting is perpendicular to the other attaching surface of the insert to be cut after a certain distance, the line cutting is continued along the clockwise/counterclockwise direction until reaching the other insert, so as to form an injection molding groove surface structure for forming the right-angled sides, in the line cutting process of each insert, the line cutting distances are the same, and the starting points of the line cutting are the same from the axial direction, so as to ensure that the axial sides of the formed product are the same right-angled sides, and the right-angled sides are provided with sharp edges. In this embodiment, there are three pairs of insert pairs 100, which are composed of three identical inner inserts 120 and three identical outer inserts 110, and the number of the insert pairs 100 may be two or more than three, and the design is based on different numbers of edges of the product, and is also within the scope of the present invention.
In some embodiments of the present invention, when combining the insert to form the blank, the method further comprises a pre-machining process: cutting a splicing angle from the blank line of the outer insert 110, half-cutting downwards along the vertex angle line of the splicing angle to form a splicing half angle, and linearly cutting an L-shaped limiting groove 111 when cutting into the outer insert 110; cutting the blank of the inner insert 120, cutting an L-shaped connecting part 121 at the embedding position of the inner insert 120 along the groove surface direction of the L-shaped limiting groove 111, and cutting an inner insert half angle which is matched with the splicing half angle to form the splicing angle at the other end relative to the L-shaped connecting part 121. In addition, the inner insert 120 and the outer insert 110 may be connected by other limiting structures or other connecting structures, and the design is reasonable according to the product mold opening condition, and is also within the protection scope of the present invention.
In some embodiments of the present invention, referring to fig. 2, the integral part is composed of three pairs of insert pairs 100, each pair 100 forming a 120 degree splice angle, and there may be other multiple insert pairs 100, with the degree of the splice angle being determined by the number of insert pairs 100.
Specifically, in the step b, the line cutting is performed counterclockwise in a direction of 60 degrees from the central axis to the bonding surfaces of the inner insert 120/the outer insert 110, so that the line cutting direction is parallel to the opposite bonding surfaces of the insert to be line-cut in the step b, and the bonding surface is an end bonding surface opposite to the start bonding surface, so as to adapt to the line cutting process of the combined insert shown in fig. 2.
In some embodiments of the present invention, the inner insert 120 is embedded in the outer insert 110 and forms the insert pair 100 with the outer insert 110, and the insert pair 100 is annularly disposed on a fixed combination on a line header to form an integral part, so that the annular line cutting process forms concentric inserts.
The invention utilizes the combined line cutting process, ensures the circle center degree of the combined insert during line cutting, improves the insert precision, eliminates the fillet defect during the combined line cutting through the fillet groove 300 and the repair welding process, forms the sharp edge 200 of the product, and produces the combined insert suitable for producing the sharp edge 200 product.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (6)
1. The CNC wire cutting machining process of the combined insert is characterized by comprising the following machining steps of:
a, fixing a plurality of insert pairs on a CNC line cutting table to form a central symmetrical integrated part;
b, performing line cutting clockwise/anticlockwise on the binding surface of a certain inner insert/outer insert, forming an injection molding groove surface for molding the axial edge of a product on the cut insert, directly performing line cutting on the other insert to form a notch groove when the other binding surface of the cut insert is reached, and finishing the line cutting on the cut insert;
c, performing line cutting on the adjacent inserts in the line cutting direction of the inserts to be subjected to line cutting in the step b, and repeating the step b until the line cutting of all the inserts is completed;
d, disassembling the integrated part, and respectively performing repair welding on the corner notch groove on each insert to enable the binding surface with the corner notch groove to be smooth again.
2. The CNC wire cutting process for combined inserts according to claim 1, wherein in the step b, when the clockwise/counterclockwise wire cutting is started, the wire cutting direction is parallel to the other attaching surface of the insert to be cut, and the wire cutting is continued clockwise/counterclockwise perpendicular to the other attaching surface of the insert to be cut by a certain distance until the other insert is reached.
3. The CNC wire cutting process for the combined insert according to the claim 1, characterized by further comprising the following pre-machining processes: cutting a splicing angle on the blank line of the outer insert, half-cutting downwards along the vertex angle line of the splicing angle to form a splicing half angle, and linearly cutting an L-shaped limiting groove when cutting to the inside of the outer insert; cutting the blank of the inner insert, cutting an L-shaped connecting part at the embedding position of the inner insert along the groove surface direction of the L-shaped limiting groove, and cutting an inner half-angle which is matched with the splicing half-angle to form the splicing angle relative to the other end of the L-shaped connecting part.
4. The CNC wire cutting process for the combined insert according to the claim 3, wherein the integrated part is composed of three sets of the insert pairs, and the splicing angle of each set of the insert pairs is 120 degrees.
5. The insert-combining CNC wire cutting process according to the claim 4, wherein in the step b, the wire is cut counterclockwise from the central axis and at 60 degrees with the inner insert/outer insert abutment surface.
6. The CNC wire cutting process for combined inserts according to claim 4, wherein in the step a, the inner insert is embedded in the outer insert and forms an insert pair with the outer insert, and the insert pair is annularly arranged on a fixed combined wire cutting table.
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| CN202010344499.3A CN111558751B (en) | 2020-04-27 | 2020-04-27 | CNC wire cutting machining process for combined insert |
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| CN202010344499.3A CN111558751B (en) | 2020-04-27 | 2020-04-27 | CNC wire cutting machining process for combined insert |
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| CN111558751B CN111558751B (en) | 2021-06-18 |
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