CN108941808B - Machining method for inner hole key groove of hard alloy sleeve part - Google Patents
Machining method for inner hole key groove of hard alloy sleeve part Download PDFInfo
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- CN108941808B CN108941808B CN201710369475.1A CN201710369475A CN108941808B CN 108941808 B CN108941808 B CN 108941808B CN 201710369475 A CN201710369475 A CN 201710369475A CN 108941808 B CN108941808 B CN 108941808B
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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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- 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
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- B23H7/06—Control of the travel curve of the relative movement between electrode and workpiece
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Abstract
The invention discloses a method for processing an inner hole key groove of a hard alloy sleeve part, which is characterized in that a program origin is arranged in the inner hole of the sleeve part, a first cutting falling point and a second cutting falling point are designed on the inner hole according to the width of the key groove, a workbench (driving a substitute processed product) and/or a linear cutting wire are moved to enable the linear cutting wire to generate relative displacement relative to the workbench, the sleeve part is processed from the first cutting falling point and the second cutting falling point until the depth requirement of the key groove is met, and then the processing is continued from the depth position of the key groove along the width direction of the key groove until chips fall off, so that the processing of the key groove is completed. According to the wire cutting and feeding mode, the final chip falling position in the machining process is adjusted by arranging the two cutting falling points, so that the notch of the key groove is prevented from falling, the key size precision of the key groove is ensured, and the user requirements are met.
Description
Technical Field
The invention belongs to the field of machining, and relates to a machining method for an inner hole key groove of a sleeve part, in particular to a machining method for an inner hole key groove of a sleeve part made of hard alloy.
Background
In order to meet the use requirements, a key groove is usually designed in an inner hole of a hard alloy sleeve part; taking a hard alloy shaft sleeve widely applied to deep well oil operation such as deep sea, desert and the like as an example, the structure is shown in fig. 1 and fig. 2, a key groove is designed at an inner hole part, in order to meet the use requirement of the oil-submerged pump in the deep well oil operation, the key groove width of the hard alloy shaft sleeve is required to be ensured to be 1.6mm + (0-0.025) mm, the key groove depth is required to be L + (0-0.1) mm, and the size of a gas eliminating groove is required to be ensured to be 0.05mm +0.025mm, the key groove is processed by adopting anticlockwise (processing direction) straight line or circular interpolation, a prefabricated cutting falling point and a molybdenum wire withdrawing point are the same, a conventional processing wire path is shown in fig. 3, and the OA, AC, CB, BD, DE, EF and FO are sequentially taken as a starting point by taking O as the starting point. The defect part of the product processed by adopting the wire moving mode mostly appears at a cutting falling point, and the shape of the defect part is a small bevel angle (such as a part K in figure 4). The product and the appearance obtained by the processing method are difficult to meet the high-precision requirement of the width of the key groove (for example, the tolerance of the width of the key groove is 0.025 mm).
Disclosure of Invention
The invention aims to provide a method for machining an inner hole key groove of a hard alloy sleeve part, which aims to solve the technical problem that the current machining method is difficult to obtain the inner hole key groove of the hard alloy sleeve part with high precision.
In order to achieve the purpose, the invention provides a method for processing an inner hole key groove of a hard alloy sleeve part, which is characterized in that a first cutting falling point and a second cutting falling point are designed on the inner hole of the sleeve part to be processed according to the width of the key groove; the key groove machining method comprises the following steps:
(1) installing a sleeve part to be processed on a workbench of an online cutting device, setting a program origin in an inner hole of the sleeve part, and establishing a two-dimensional coordinate system by taking the set program origin as a coordinate origin, wherein the two-dimensional coordinate system comprises an X axis and a Y axis which are vertical to each other; initially, a set distance is reserved between the linear cutting wire and a first cutting falling point and a second cutting falling point on an inner hole of the sleeve part to be machined;
(2) the linear cutting wire moves relative to the workbench in an idle mode until the linear cutting wire is in contact with the first cutting falling point, then the linear cutting wire moves relative to the workbench continuously, and the sleeve part is machined until the depth machining amount of the key groove is met;
(3) the linear cutting wire moves relative to the workbench in an idle mode until the linear cutting wire is contacted with the second cutting drop point, then the linear cutting wire moves relative to the workbench continuously, and the sleeve type part is machined until the depth machining amount of the key groove is met;
(4) feeding the linear cutting wire to the position processed in the step (2), and moving the linear cutting wire relative to the workbench until the width processing amount of the key groove is met, so as to finish chip falling;
(5) the wire cutting wire and the table are returned to the program origin.
The inner hole key groove processing method of the hard alloy sleeve part comprises the steps of setting a program origin in an inner hole of the sleeve part, designing a first cutting falling point and a second cutting falling point on the inner hole according to the width of a key groove, moving a workbench (driving a substitute processing product) and/or a linear cutting wire, enabling the linear cutting wire to generate relative displacement relative to the workbench, processing the sleeve part from the first cutting falling point and the second cutting falling point firstly until the requirement on the depth of the key groove is met, then continuously processing the sleeve part along the width direction of the key groove from the depth position of the key groove until chips fall off, finishing the processing of the key groove, adjusting the positions of the chips in the linear cutting mode, avoiding the notches of the key groove from falling off, ensuring the key size precision of the key groove, and meeting the requirements of users.
In the method for processing the inner hole key groove of the hard alloy sleeve part, for convenience of processing, the wire cutting wire and/or the workbench can be controlled to move along the direction parallel to the Y axis or the X axis, in the specific step (2), the wire cutting wire can be idle along the direction parallel to the Y axis relative to the workbench until the wire cutting wire and a first cutting falling point are both positioned on a straight line parallel to the X axis, then the wire cutting wire is idle along the straight line relative to the workbench for a first set distance until the wire cutting wire is in contact with the first cutting falling point, then the wire cutting wire continuously moves relative to the workbench, and the sleeve part is processed to meet the depth processing amount of the key groove; when the depth processing amount of the key groove is reached, the linear cutting wire can reversely and idly travel along the direction parallel to the X axis relative to the workbench until the distance between the linear cutting wire and the first cutting falling point is not less than a second set distance; in the step (3), the linear cutting wire can be idle-run in a direction parallel to the Y axis relative to the workbench until the linear cutting wire and the second cutting falling point are both positioned on a straight line parallel to the X axis, then the linear cutting wire is idle-run along the straight line until the linear cutting wire is contacted with the second cutting falling point, and then the linear cutting wire continuously moves relative to the workbench to start to process the sleeve part until the depth processing amount of the key groove is met.
In order to ensure smooth processing and no short circuit, in the step (2) and the step (3), preferably, a distance needs to be set between the linear cutting wire and a first cutting falling point and a second cutting falling point on the inner hole of the sleeve part to be processed on the workbench, the first set distance and the second set distance are used for the purpose, and the first set distance and the second set distance are 0.2-0.4 mm; the first set distance and the second set distance are equal or unequal.
In the method for processing the inner hole key groove of the hard alloy sleeve part, in order to meet the use requirement of the key groove, in the step (2), after the depth processing amount of the key groove of the sleeve part is reached, the linear cutting wire is fed for 0.05-0.2 mm relative to the workbench along the depth processing direction of the key groove, and then the linear cutting wire processes the sleeve part into the corresponding gas elimination groove.
In the method for processing the inner hole key groove of the hard alloy sleeve part, in order to meet the use requirement of the key groove, in the step (3), after the depth processing amount of the key groove of the sleeve part is reached, the linear cutting wire is fed for 0.05-0.2 mm relative to the workbench along the depth processing direction of the key groove, and then the linear cutting wire processes the sleeve part into a corresponding gas elimination groove; and (4) after the air-eliminating groove is machined, reversely and idly moving the wire-electrode cutting wire relative to the workbench to the position where the depth machining of the key groove of the sleeve part is completed in the step (3), and then entering the step (4).
According to the method for processing the inner hole key groove of the hard alloy sleeve part, the size of the degassing groove can be controlled by the diameter of the wire cutting wire.
According to the method for machining the inner hole key groove of the hard alloy sleeve part, in order to facilitate program size adjustment in the machining process, the program origin is located at one half of the width of the inner hole forming key groove of the sleeve part.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the wire cutting and feeding mode, the final chip falling position in the machining process is adjusted by arranging the two cutting falling points, so that the notch of the key groove is prevented from falling, the key size precision of the key groove is ensured, and the user requirements are met.
2. Before the inner hole of the sleeve part is machined, the wire cutting wire is spaced a certain distance away from the workbench, so that the machining smoothness can be guaranteed, and the short circuit problem caused by too short distance between the wire cutting wire and the part to be machined is avoided.
3. In the key groove processing process, the air elimination groove is further processed at the angular position in the key groove, so that the later assembly is facilitated.
Drawings
Fig. 1 is a schematic structural diagram of a hard alloy shaft sleeve according to the invention.
Fig. 2 is an enlarged schematic view of portion I of fig. 1.
FIG. 3 is a schematic diagram of a conventional machining wire-moving path of a key groove of an inner hole of a hard alloy shaft sleeve.
Fig. 4 is a schematic diagram of a hard alloy shaft sleeve inner hole key groove obtained by conventional processing wire traveling.
FIG. 5 is a schematic diagram of a machining program path of a hard alloy shaft sleeve inner hole key groove.
The cutting tool comprises a shaft sleeve 1, a shaft sleeve 2, a key groove 21, a degassing groove 3, a first cutting falling point 4 and a second cutting falling point.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
in this embodiment, a detailed explanation is given to the method for machining the inner hole key groove of the cemented carbide sleeve part, which is provided by the invention, by taking the machining of the inner hole key groove of the cemented carbide sleeve as an example.
In this embodiment, a hard alloy shaft sleeve with a key slot in an inner hole is to be processed, as shown in fig. 1 and 2, the inner hole of the hard alloy shaft sleeve 1 is designed with a key slot 2, the section of the key slot 2 is rectangular, and the key slot comprises a first edge, a second edge and a third edge, wherein the first edge and the second edge are opposite, the third edge is located between the first edge and the second edge and connects the first edge and the second edge, and a position where the first edge, the second edge and the third edge are connected is designed with a degassing slot 21. In this embodiment, the depth processing amount of the key groove 2 to be processed is 1mm, and the width processing amount is 1.6 mm. The inner hole of the hard alloy shaft sleeve 1 is designed with a first cutting falling point 3 and a second cutting falling point 4.
The linear cutting equipment adopted in the embodiment is a DK7732 numerical control wire cut electric discharge machine, a workbench drives a part to be processed to move, a linear cutting wire is fixed, the adopted linear cutting wire is a molybdenum wire, and the diameter phi of the adopted linear cutting wire is 0.18 mm.
In the program for machining the key groove of the inner hole of the hard alloy shaft sleeve provided by this embodiment, as shown in fig. 5, a program origin is set at a position of the inner hole of the shaft sleeve 1, which is half the width of the key groove to be machined, and a two-dimensional coordinate system is established with the set program origin as a coordinate origin o, and includes an X axis and a Y axis which are perpendicular to each other; the Y axis is parallel to the width direction of the key groove, the coordinate system moves along with the workbench, the linear cutting wire is located at a point o at the initial moment, and the processing program comprises the following steps:
(1) installing the shaft sleeve 1 to be processed on a workbench of the online cutting equipment, starting a wire cylinder and a water pump, and starting a processing program;
(2) the worktable drives the shaft sleeve 1 to move along the Y-axis direction until the linear cutting wire and the first cutting falling point 3 are both positioned on the X-axis, namely, the linear cutting wire moves from the point o to the point a (which meets the half distance of the width of the machined key groove) relative to the coordinate system; the workbench drives the shaft sleeve 1 to move to a position where the linear cutting wire is in contact with the first cutting falling point 3 in an idle mode, namely the linear cutting wire moves from a point a to a point b along the X axis relative to the coordinate system, the distance between the points a and b is a first set distance, the distance ab can guarantee smooth processing without short circuit, and the distance ab is about 0.3mm in the embodiment; then, the workbench drives the shaft sleeve 1 to move continuously, and the linear cutting wire begins to process the shaft sleeve 1; when the linear cutting wire moves from the point b to the point c relative to the coordinate system to meet the key groove depth processing amount in the direction, the workbench drives the shaft sleeve 1 to continue to feed by 0.05mm, so that the linear cutting wire moves from the point c to the point d relative to the coordinate system, the linear cutting wire starts to process the degassing groove 21, the design of the degassing groove 21 can enable the shaft sleeve 1 to avoid interference during assembly, the size of the degassing groove 21 can be controlled by the diameter of the linear cutting wire, the radius R of the degassing groove is 0.1 +/-0.05 mm, and the depth of the degassing groove is 0.05 +/-0.025 mm; after the machining of the degassing groove 21 is finished, the workbench drives the shaft sleeve 1 to reversely idle until the linear cutting wire is positioned on the Y axis, namely, the linear cutting wire returns to the point a from the point d along the X axis relative to the coordinate system;
(3) the workbench drives the shaft sleeve 1 to idle along the Y-axis direction until the linear cutting wire and the second cutting drop point 4 are both positioned on the X-axis, namely the linear cutting wire moves from a point a to a point e (which meets the half distance of the width of the machined key groove) relative to the coordinate system; the workbench drives the shaft sleeve 1 to move to a position where the linear cutting wire is in contact with the second cutting falling point 4 in an idle mode, namely the linear cutting wire moves from a point e to a point f along an X axis relative to a coordinate system, and the setting purpose of the ef distance is the same as that of the ab distance; then, the workbench drives the shaft sleeve 1 to move continuously, and the linear cutting wire begins to process the shaft sleeve 1; when the linear cutting wire moves from the point f to the point g relative to the coordinate system to meet the key groove depth processing amount in the direction, the workbench drives the shaft sleeve 1 to continue to feed for 0.05mm, so that the linear cutting wire moves from the point g to the point h relative to the coordinate system, the linear cutting wire starts to process the degassing groove 21, and the processing mode and the size of the degassing groove are the same as those in the step (2); after the machining of the degassing groove 21 is finished, the workbench drives the shaft sleeve 1 to reversely empty to the position where the machining of the key groove in the step (3) is finished along the depth direction, namely, the linear cutting wire returns to the point g from the point h along the X axis relative to the coordinate system;
(4) the workbench drives the shaft sleeve 1 to move along the Y-axis direction until chip falling is completed, namely, the linear cutting wire is fed and runs to a point c from a point g relative to a coordinate system, and the linear cutting wire is machined until the machining amount of the width of the key groove is met, so that the chip falling is completed;
(5) the workbench drives the processed shaft sleeve 1 to move and return to the program origin, namely, the linear cutting wire is linked along the X axis and the Y axis relative to the coordinate system and returns to the program origin.
The machining process of the hard alloy shaft sleeve inner hole key groove is completed under the conditions that a workbench (for installing a product to be machined) moves and a linear cutting wire does not move, and a person skilled in the art can also design a program to enable the linear cutting wire to move and the workbench does not move so as to complete the task.
Adopt the hole keyway of above-mentioned processing mode processing carbide product, the keyway width tolerance that finally obtains the product has reached 0.025mm, and the position degree has reached 0.05mm, and keyway bottom air-eliminating groove R is 0.1mm, and air-eliminating groove degree of depth 0.05mm satisfies the critical dimension that the customer provided and the control requirement of appearance quality.
Although the present embodiment describes the method for machining the inner hole key groove of the cemented carbide shell member by taking the key groove having a rectangular cross section as an example, the method for machining the inner hole key groove of the cemented carbide shell member is not limited to the method for machining the key groove having a rectangular cross section, and can be applied to the method for machining the key groove having any cross section.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.
Claims (9)
1. A method for processing an inner hole key groove of a hard alloy sleeve part is characterized in that a first cutting drop point and a second cutting drop point are designed on the inner hole of the sleeve part according to the width of the key groove; the key groove machining method comprises the following steps:
(1) installing the sleeve part on a workbench of an online cutting device, setting a program origin in an inner hole of the sleeve part, and establishing a two-dimensional coordinate system by taking the set program origin as a coordinate origin, wherein the two-dimensional coordinate system comprises an X axis and a Y axis which are vertical to each other; initially, a set distance is reserved between the linear cutting wire and a first cutting falling point and a second cutting falling point on an inner hole of the sleeve part to be machined;
(2) the linear cutting wire moves relative to the workbench in an idle mode until the linear cutting wire is in contact with the first cutting falling point, then the linear cutting wire moves relative to the workbench continuously, and the sleeve part is machined until the depth machining amount of the key groove is met;
(3) the linear cutting wire moves relative to the workbench in an idle mode until the linear cutting wire is contacted with the second cutting drop point, then the linear cutting wire moves relative to the workbench continuously, and the sleeve type part is machined until the depth machining amount of the key groove is met;
(4) feeding the linear cutting wire to the position processed in the step (2), and moving the linear cutting wire relative to the workbench until the width processing amount of the key groove is met, so as to finish chip falling;
(5) the wire cutting wire and the table are returned to the program origin.
2. The method according to claim 1, wherein in step (2), the wire cutting wire is moved along a direction parallel to the Y axis with respect to the table until the wire cutting wire and the first cutting location are located on a straight line parallel to the X axis, and then the wire cutting wire is moved along the straight line with respect to the table by a first predetermined distance until the wire cutting wire contacts the first cutting location.
3. The method according to claim 2, wherein in step (2), when the depth of the key groove is reached, the wire cutting wire is then moved in a direction opposite to the direction parallel to the X-axis with respect to the table over the first cutting drop point until the distance between the wire cutting wire and the first cutting drop point is not less than a second predetermined distance.
4. The method according to any one of claims 1 to 3, wherein in step (3), the wire cutting wire is idle along the Y-axis direction relative to the table until the wire cutting wire and the second cutting drop point are both located on a straight line parallel to the X-axis, and then idle along the straight line until the wire cutting wire and the second cutting drop point contact each other.
5. The method for machining an inner hole keyway of a cemented carbide sleeve part according to claim 3, wherein the first set distance and the second set distance are 0.2 to 0.4 mm; the first set distance and the second set distance are equal or unequal.
6. The method for machining an inner hole keyway of a hard alloy sleeve part according to any one of claims 1 to 3, wherein in the step (2), after the keyway depth machining amount of the sleeve part is reached, the linear cutting wire is advanced by 0.05-0.2 mm relative to the workbench along the keyway depth machining direction, and then the linear cutting wire machines a corresponding degassing groove on the sleeve part.
7. The method for machining the key groove of the inner hole of the hard alloy sleeve part according to claim 4, wherein in the step (3), after the depth machining amount of the key groove of the sleeve part is reached, the linear cutting wire is fed by 0.05-0.2 mm relative to the workbench along the depth machining direction of the key groove, and then the linear cutting wire machines a corresponding degassing groove on the sleeve part.
8. The method for machining the inner hole keyway of the hard alloy sleeve part according to claim 7, wherein after the machining of the degassing groove is finished, the wire-electrode cutting wire reversely moves to the position, where the machining of the keyway of the sleeve part is finished, of the machining depth of the keyway of the sleeve part in the step (3) in an empty mode, and then the step (4) is carried out.
9. The method of claim 4, wherein the program origin is located at a half width of the inner bore forming key groove of the sleeve.
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| CN110842301B (en) * | 2019-12-09 | 2020-06-19 | 临沂宏盛铸业有限公司 | Module cutting method for wavy cutting track |
| CN113102851B (en) * | 2021-04-22 | 2022-03-25 | 哈尔滨工业大学 | Method for machining multi-dimensional inclined hole of valve body |
| CN113399953A (en) * | 2021-07-15 | 2021-09-17 | 湖南九鼎科技（集团）永州鼎立饲料有限公司 | Main shaft and shaft sleeve machining process convenient to overhaul and disassemble |
| CN114035495A (en) * | 2021-10-18 | 2022-02-11 | 奔腾激光(温州)有限公司 | PLC control system, operation method thereof and device for operating PLC control system |
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