CN109047959B - Machining method of connecting rod special-shaped groove workpiece - Google Patents
Machining method of connecting rod special-shaped groove workpiece Download PDFInfo
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- CN109047959B CN109047959B CN201810834464.0A CN201810834464A CN109047959B CN 109047959 B CN109047959 B CN 109047959B CN 201810834464 A CN201810834464 A CN 201810834464A CN 109047959 B CN109047959 B CN 109047959B
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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
- B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
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Abstract
The invention discloses a method for processing a connecting rod special-shaped groove workpiece, which comprises the following steps: grinding the workpiece blank to form a processing alignment surface on the workpiece blank; determining a central processing point on the processing standard surface, and processing a first circular arc on one side of the central processing point on the processing standard surface; respectively machining a first straight line section at two ends of the first arc by wire cutting, wherein the first straight line section is on an extension line of a chord corresponding to the first arc; processing a second arc at one end of the first straight line section far away from the first arc by wire cutting, wherein the second arc takes the central processing point as the center of a circle; and machining a second straight line section perpendicular to the first straight line section at one end of the second arc far away from the first straight line section by wire cutting, so as to complete the machining of the special-shaped groove workpiece. The machining method provided by the invention is suitable for producing workpieces in large batch, and the machining method has simple procedures, and the machined workpieces have small tolerance and accurate workpiece size.
Description
Technical Field
The invention belongs to the technical field of part processing, and particularly relates to a method for processing a connecting rod special-shaped groove workpiece.
Background
At present, in the processing of connecting rod special-shaped groove workpieces, a general processing method comprises the following steps: 1. scribing: drawing a bottom hole broaching machining line of the waist hole according to a drawing; 2. drilling: positioning the tire by drilling with the Ra1.6 bottom surface as a clamping datum plane, fixing the tire after aligning a first part, and ensuring that the positions of broaching bottom holes of waist holes of a batch of parts are the same as that of one side surface; 3. pressing the workpiece by a pressing plate: drilling and reaming a bottom hole phi 22H7 according to a line, and ensuring the perpendicularity of the bottom hole and a reference surface and the tolerance of 0.02 mm; 4. broaching: and broaching the waist hole according to the drawing by taking the bottom surface of Ra1.6 as a reference surface.
The machining method is suitable for a small number of workpieces for producing connecting rod special-shaped grooves, and when more than 200 workpieces for producing connecting rod special-shaped grooves are produced in batches, the method is complex in process, a large number of tools are used, and broaches need to be purchased, so that the machining method suitable for producing connecting rod special-shaped groove workpieces in batches is needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for processing a connecting rod special-shaped groove workpiece.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a machining method of a connecting rod special-shaped groove workpiece comprises the following steps:
grinding a workpiece blank to form a processing alignment surface on the workpiece blank;
determining a central processing point on the processing standard surface, and processing a first circular arc on one side of the central processing point on the processing standard surface;
respectively machining a first straight line section at two ends of the first arc by wire cutting, wherein the first straight line section is on an extension line of a chord corresponding to the first arc;
processing a second arc by wire cutting at one end of the first straight line section far away from the first arc, wherein the second arc takes the central processing point as the center of a circle;
and a second straight line section perpendicular to the first straight line section is processed at one end of the second arc far away from the first straight line section through wire cutting, so that the first arc, the first straight line section, the second arc and the second straight line section form a special-shaped groove in a surrounding mode, and further the processing of the special-shaped groove workpiece is completed.
Furthermore, at least three fixing holes are distributed on the workpiece blank, and the workpiece blank is fixed on the processing pressing plate through the fixing holes and the bolts.
Further, when the workpiece blank is subjected to linear cutting, the alignment block is used for checking the verticality of the wire electrode used for linear cutting, and the wire electrode is adjusted to be vertical to the processing alignment surface through the corrector, so that the wire electrode is vertical to the processing alignment surface.
Further, in the wire cutting of the workpiece blank, a wire electrode having a diameter of 0.18 was used as a wire cutting molybdenum wire.
Furthermore, when the workpiece blank is subjected to linear cutting, the cutting fluid is kerosene.
Further, the method also comprises the step of carrying out heat treatment on the profiled groove, wherein the heat treatment comprises the following steps: and sequentially performing anti-carburizing treatment on the special-shaped groove of the workpiece, and then sequentially performing carburizing and quenching heat treatment.
Further, the anti-carburizing treatment for the profiled groove comprises the following steps: and after the surface of the special-shaped groove is coated with the anti-carburizing coating with the thickness of 0.3mm to 1.0mm, drying the workpiece coated with the anti-carburizing coating.
Further, the drying treatment of the workpiece coated with the anti-carburizing paint comprises:
putting the workpiece coated with the anti-carburizing coating into a furnace at room temperature, heating the furnace from the room temperature to 90-110 ℃ at the heating rate of 4-6 ℃/min, and keeping the temperature at 90-110 ℃ for two hours;
and continuously heating the furnace temperature from 90-110 ℃ to 150-170 ℃ at the heating rate of 5-8 ℃/min, preserving the temperature for two hours at 150-170 ℃, and discharging the dried workpiece.
Further, the carburizing the profiled groove comprises: and (3) putting the workpiece subjected to the anti-carburizing treatment into a carburizing furnace filled with a carburizing material, heating the carburizing furnace to 920-940 ℃ at the heating rate of 10-20 ℃/min, preserving the heat at 1920-940 ℃ for two hours, cooling the carburizing furnace to 880-900 ℃ at the heating rate of 5-10 ℃/min, and discharging for oil cooling.
Further, the quenching heat treatment of the profiled groove comprises the following steps: quenching twice at the temperature of 750-; the secondary quenching temperature is 800-820 ℃, oil cooling is adopted, and then tempering is carried out.
According to the processing method of the connecting rod special-shaped groove workpiece, the processing technology of the broach is replaced by the processing technology of linear cutting, so that the secondary clamping of the workpiece is omitted, the method is suitable for large-batch production of the workpiece, and the influence of the loss of a processing cutter on the shape and position size and tolerance of the workpiece is guaranteed by replacing the wire of the linear cutting, so that the method is very suitable for processing the special-shaped groove on the workpiece. In a word, the machining method provided by the invention is suitable for producing workpieces in large batch, and the machining method has simple procedures, and the machined workpieces have small tolerance and accurate sizes.
Drawings
FIG. 1 is a flow chart of a method of machining a connecting rod profiled groove workpiece in accordance with an exemplary embodiment of the present invention;
FIG. 2 is a cross-sectional view of a connecting rod profile groove workpiece in accordance with an exemplary embodiment of the present invention;
FIG. 3 is a top view of a connecting rod profiled groove workpiece in accordance with an exemplary embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of a connecting rod profiled groove workpiece in accordance with an exemplary embodiment of the present invention.
In the figure, 1-processing standard surface, 2-central processing point, 3-first circular arc, 4-first straight line segment, 5-second circular arc, 6-second straight line segment and 7-fixing hole.
Detailed Description
In order to overcome the defects in the prior art, the invention provides a method for processing a connecting rod special-shaped groove workpiece. In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 4, a method for processing a connecting rod special-shaped groove workpiece comprises the following steps:
s100, grinding the workpiece blank to form a processing alignment surface 1 on the workpiece blank;
s200, determining a central processing point 2 on a processing standard surface 1, and processing a first arc 3 on one side of the central processing point 2 on the processing standard surface 1; in this embodiment, the central processing point 2 is determined by drawing the center line and the position line of phi 14.5H7, and then by using phi 14.5H7 as the diameter and the central processing point 2 as the center, a first arc 3 of phi 20H7 is processed to the left side along the horizontal direction;
s300, respectively machining a first straight line segment 4 at two ends of the first arc 3 through wire cutting, wherein the first straight line segment 4 is arranged on an extension line of a chord corresponding to the first arc 3;
s400, machining a second arc 5 at one end of the first straight line segment 4 far away from the first arc 3 through wire cutting, wherein the second arc 5 takes the central machining point 2 as the center of a circle, and the second arc 5 is an R10.3 arc;
s500, machining a second straight line section 6 perpendicular to the first straight line section 4 at one end, far away from the second circular arc 5 of the first straight line section 4, of the first circular arc 3 through wire cutting, so that the first straight line section 4, the second circular arc 5 and the second straight line section 6 enclose a special-shaped groove, and machining of a special-shaped groove workpiece is completed.
In a preferred embodiment, at least three fixing holes 7 are distributed on the workpiece blank, and the workpiece blank is fixed on the processing pressure plate through the fixing holes 7 and the bolts.
In a preferred embodiment, when the workpiece blank is subjected to linear cutting, the alignment block is used for checking the verticality of the wire electrode used for linear cutting, and the wire electrode is adjusted to be vertical to the processing standard surface 1 through the corrector, so that the wire electrode is kept to be vertical to the processing standard surface 1.
Further, in wire cutting the workpiece blank, a wire electrode having a diameter of 0.18 was used as a wire cutting molybdenum wire.
Wherein, when the workpiece blank is subjected to linear cutting, the cutting fluid is kerosene. Kerosene is selected as cutting fluid, the kerosene has the advantages of extremely low conductivity and no electrolytic corrosion, a deteriorated layer is not generated during cutting, and the requirement of Ra < 0.8 on processing precision can be met.
In a preferred embodiment, the method further comprises the step of performing heat treatment on the special-shaped groove, wherein the heat treatment comprises sequentially performing anti-carburizing treatment on the special-shaped groove of the workpiece, and then sequentially performing carburizing and quenching heat treatment.
Further, the anti-carburizing treatment for the special-shaped groove comprises the following steps: and (3) after the surface of the special-shaped groove is coated with the anti-carburizing coating with the thickness of 0.3mm to 1.0mm, drying the workpiece coated with the anti-carburizing coating.
Further, the drying treatment of the work piece coated with the anti-carburizing paint comprises the following steps:
putting the workpiece coated with the anti-carburizing coating into a furnace at room temperature, heating the furnace from the room temperature to 90-110 ℃ at the heating rate of 4-6 ℃/min, and keeping the temperature at 90-110 ℃ for two hours;
and continuously heating the furnace temperature from 90-110 ℃ to 150-170 ℃ at the heating rate of 5-8 ℃/min, preserving the temperature for two hours at 150-170 ℃, and discharging the dried workpiece.
Further, the carburizing the profile groove includes: after the work piece treated by the anti-carburizing treatment is put into a carburizing furnace filled with a carburizing material, the carburizing furnace is heated to 920-940 ℃ at the heating rate of 10-20 ℃/min, and is kept warm at 1920-940 ℃ for two hours, the carburizing furnace is cooled to 880-900 ℃ at the heating rate of 5-10 ℃/min, and is taken out of the furnace for oil cooling, and after the carburization treatment, the carburized surface layer of the work piece is quenched and tempered at low temperature, high hardness, wear resistance and fatigue strength can be obtained, and the center of the work piece still has high plasticity and toughness.
Further, the quenching heat treatment of the special-shaped groove comprises the following steps: quenching twice at the temperature of 750-; the secondary quenching temperature is 800-820 ℃, oil cooling is adopted, and then tempering is carried out.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (7)
1. A machining method for connecting rod special-shaped groove workpieces is characterized by comprising the following steps:
grinding a workpiece blank to form a processing alignment surface on the workpiece blank;
determining a central processing point on the processing standard surface, and processing a first circular arc on one side of the central processing point on the processing standard surface;
respectively machining a first straight line section at two ends of the first arc by wire cutting, wherein the first straight line section is on an extension line of a chord corresponding to the first arc;
processing a second arc by wire cutting at one end of the first straight line section far away from the first arc, wherein the second arc takes the central processing point as the center of a circle;
a second straight line section perpendicular to the first straight line section is processed at one end of the second arc far away from the first straight line section through wire cutting, so that the first arc, the first straight line section, the second arc and the second straight line section enclose a special-shaped groove, and further the processing of the special-shaped groove workpiece is completed;
also includes the heat treatment to the profiled groove, including: sequentially performing anti-carburizing treatment on the special-shaped groove of the workpiece, and then sequentially performing carburizing and quenching heat treatment;
wherein the carburizing the profiled groove comprises: putting the work piece subjected to the anti-carburizing treatment into a carburizing furnace filled with a carburizing material, heating the carburizing furnace to 920-940 ℃ at the heating rate of 10-20 ℃/min, preserving the heat at 920-940 ℃ for two hours, cooling the carburizing furnace to 880-900 ℃ at the heating rate of 5-10 ℃/min, and discharging for oil cooling;
the quenching heat treatment of the special-shaped groove comprises the following steps: quenching twice at the temperature of 750-; the secondary quenching temperature is 800-820 ℃, oil cooling is adopted, and then tempering is carried out.
2. The method for machining the connecting rod special-shaped groove workpiece as claimed in claim 1, wherein at least three fixing holes are distributed on the workpiece blank, and the workpiece blank is fixed on the machining pressure plate through the fixing holes and bolts.
3. The method for machining a connecting rod special-shaped groove workpiece according to claim 1, wherein when the workpiece blank is subjected to linear cutting, an alignment block is used for checking the perpendicularity of a wire electrode used for linear cutting, and the wire electrode is adjusted to be perpendicular to the machining alignment surface through a corrector so that the wire electrode is kept perpendicular to the machining alignment surface.
4. The method as claimed in claim 3, wherein the wire electrode used for wire-cutting the workpiece blank is a wire-cut molybdenum wire with a diameter of 0.18.
5. The method for machining the connecting rod special-shaped groove workpiece as claimed in claim 4, wherein cutting fluid is kerosene oil when the workpiece blank is subjected to wire cutting.
6. The machining method for the connecting rod special-shaped groove workpiece as claimed in claim 1, wherein the anti-carburizing treatment for the special-shaped groove comprises the following steps: and after the surface of the special-shaped groove is coated with the anti-carburizing coating with the thickness of 0.3mm to 1.0mm, drying the workpiece coated with the anti-carburizing coating.
7. The method for processing the connecting rod special-shaped groove workpiece as claimed in claim 6, wherein the step of drying the workpiece coated with the anti-carburizing paint comprises the following steps:
putting the workpiece coated with the anti-carburizing coating into a furnace at room temperature, heating the furnace from the room temperature to 90-110 ℃ at the heating rate of 4-6 ℃/min, and keeping the temperature at 90-110 ℃ for two hours;
and continuously heating the furnace temperature from 90-110 ℃ to 150-170 ℃ at the heating rate of 5-8 ℃/min, preserving the temperature for two hours at 150-170 ℃, and discharging the dried workpiece.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810834464.0A CN109047959B (en) | 2018-07-26 | 2018-07-26 | Machining method of connecting rod special-shaped groove workpiece |
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| CN201810834464.0A CN109047959B (en) | 2018-07-26 | 2018-07-26 | Machining method of connecting rod special-shaped groove workpiece |
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| CN109047959B true CN109047959B (en) | 2020-03-31 |
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| CN110614410B (en) * | 2019-09-20 | 2020-09-01 | 常州工学院 | Horizontal vibration device for dovetail groove electrolytic machining and dovetail groove machining method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6029226A (en) * | 1983-07-21 | 1985-02-14 | Fanuc Ltd | Wire-cut electrical discharge machining device |
| CN102069246A (en) * | 2010-12-10 | 2011-05-25 | 中国第一汽车集团公司 | Aligning method for accurate linear cutting of profile hole parts |
| CN102528192B (en) * | 2011-12-31 | 2016-10-05 | 中国第一汽车股份有限公司 | Accurate wire cutting method with profile insert abnormity die hole |
| CN102776471A (en) * | 2012-07-10 | 2012-11-14 | 镇江中船设备有限公司 | Carburizing quenching technology for low-carbon alloy steel parts |
| CN102764921B (en) * | 2012-07-30 | 2014-03-26 | 沈阳富创精密设备有限公司 | Special-shaped part linear cutting method and special-shaped part linear cutting fixture |
| CN103831496A (en) * | 2012-11-20 | 2014-06-04 | 苏州星诺奇传动科技有限公司 | Method for machining grooves in shaft |
| CN103736648B (en) * | 2013-12-31 | 2016-07-06 | 南车戚墅堰机车车辆工艺研究所有限公司 | A kind of gear anti-carburizi ng processing method |
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