CN115178818A - Piston pin hole machining method and device and piston - Google Patents
Piston pin hole machining method and device and piston Download PDFInfo
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- CN115178818A CN115178818A CN202210993866.1A CN202210993866A CN115178818A CN 115178818 A CN115178818 A CN 115178818A CN 202210993866 A CN202210993866 A CN 202210993866A CN 115178818 A CN115178818 A CN 115178818A
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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
- B23H5/00—Combined machining
- B23H5/06—Electrochemical machining combined with mechanical working, e.g. grinding or honing
Abstract
The invention discloses a piston pin hole processing method, a piston pin hole processing device and a piston, wherein the piston pin hole processing method comprises the following steps: positioning the piston; boring a straight pin hole of the piston, and reserving the boring machining allowance of the straight pin hole; processing a straight pin hole into a forming pin hole in an electrolytic pin hole mode; and cleaning the piston. The original three procedures of boring the steps outside the pin hole, milling the chamfer inside the pin hole and boring the special-shaped pin hole are changed into one procedure of electrolyzing the pin hole, and simultaneously, no burr is left after processing, so that the deburring procedure is omitted; the process flow is shorter, and the processing efficiency is higher. The electrolytic machining tool has small abrasion and good consistency, and can obviously save long-term cost; the processed piston material has no thermal influence and no boring hardened layer, the surface oleophylic ability after electrolytic treatment is better, and the oil storage capacity of the piston pin hole is improved; the cathode for electrolytic machining of the piston pin hole is not stressed, the clamping force of the piston is small, the boring force caused by periodic vibration of a boring intermittent machining cutter is avoided, the stress strain of the piston pin hole is small, and the deformation of the machined pin hole is small.
Description
Technical Field
The invention relates to the technical field of boring and electrolysis, in particular to a piston pin hole machining method and device. In addition, the invention also relates to a piston processed by the piston pin hole processing device.
Background
With the development of the engine towards the working conditions of high power, high reliability and long service life, the steel piston is a trend to replace the aluminum piston. Under the working conditions of high temperature, high pressure and high rotating speed of the piston, the maximum mechanical stress borne by the piston pin hole is increased sharply, the elastic deformation of the piston pin hole is increased, and the abrasion of the pin hole and a piston pin is aggravated and even the pin hole is occluded and bonded; meanwhile, the contact stress between the piston pin hole and the pin is increased, and the risk that the contact stress exceeds the strength which can be born by the local part of the piston pin hole exists, so that the piston pin hole is cracked, and the engine is scrapped. The steel piston has high hardness of material, fast abrasion of a cutter and higher processing difficulty than an aluminum piston, and particularly, the precision processing of a pin hole with a complex shape becomes an industrial technical problem.
At present, the industry generally adopts a special-shaped pin hole boring machine to process pin holes. The machine tool adopts a numerical control system to configure a micro-displacement servo boring pin device, and the boring cutter rod can be subjected to radial micro-diameter change, so that the aim of changing and adjusting the boring radius is fulfilled, and the boring processing of taper pin holes, horn pin holes, curved pin holes and the like is realized.
The steel piston material has high hardness, the tool is quickly worn during boring, the diameter fluctuation of a piston pin hole is large, the uniformity of the boring forming size is poor, high-frequency measurement and monitoring are needed in the machining process, and tool compensation machining is carried out; meanwhile, when the piston is tightly pressed by a boring machining clamping force, the diameter of the pin hole generates tiny elliptical deformation, and the product percent of pass is influenced.
The pin seat of the pin hole of the steel piston generally adopts a step shape, a large part of boring is intermittent boring, the operation of a cutter is discontinuous, intermittent machining periodic vibration exists, and the quality of the machined surface of the pin hole is poor. The boring processing is extrusion forming, the processing clamping force is large, the residual stress strain on the surface of the processed pin hole is large, and the reliability risk is brought to the operation work of the piston assembling machine. The process flow is long, and when the difference between the diameter of the outer step of the pin hole and the diameter of the special-shaped pin hole is more than 1.2mm, the existing boring machine cannot realize one-time clamping and machining and needs to be machined in different working procedures. When pin hole machining is carried out, the intersection of the piston pin hole and the pin seat has more burrs in steel part mechanical manufacturing, and the removing difficulty is high. The existing processing mode adopts manual rounding, the rounding size is not uniform, the phenomenon of burr reflection exists, and the molded surface of the pin hole can be accidentally damaged in the operation process; the robot is adopted for deburring, the removal is not clean, the efficiency is low, and the manufacturing cost is high.
In conclusion, the problems that how to solve the problems that the consistency of the molding size of the piston pin hole bored by the boring machine is poor, the diameter of the pin hole is changed due to large boring machining clamping force, the residual stress strain on the surface of the machined pin hole is large, and the quality of the machined pin hole is poor and the process flow is long due to the continuous machining periodic vibration of the cutter during intermittent boring are urgently needed to be solved by the technical personnel in the field at present.
Disclosure of Invention
In view of the above, the invention aims to provide a piston pin hole processing method and device and a piston, wherein pin holes are processed by the piston pin hole processing method and device, so that burrs are not generated after processing, the process flow is shorter, the processing efficiency is higher, the consistency is good, and the long-term cost is saved; the piston clamping force is small, the boring force caused by periodic vibration of a boring intermittent machining cutter is avoided, the stress strain of a piston pin hole is small, and the deformation of the processed pin hole is small.
In order to achieve the above purpose, the invention provides the following technical scheme:
a piston pin hole machining method comprises the following steps:
positioning the piston;
boring a straight pin hole of the piston, and reserving the boring machining allowance of the straight pin hole;
processing the straight pin hole into a forming pin hole in an electrolytic pin hole mode;
and cleaning the piston.
Preferably, the positioning piston comprises:
and positioning the piston when boring the straight pin hole and positioning the piston when boring the electrolysis pin hole.
Preferably, when the straight pin hole is bored, the piston is positioned by the top surface of the piston, the excircle of the piston and the bottom hole of the pin hole; and positioning the piston by the top surface of the piston, the excircle of the piston and the straight pin hole after boring during the pin hole electrolysis.
Preferably, when the straight pin hole is bored, the boring allowance of the straight pin hole relative to the cylindrical section of the forming pin hole is 0-0.3mm relative to the cylindrical section of the forming pin hole.
Preferably, when the pin hole is electrolyzed, the pin hole outer step, the pin hole inner chamfer and the special-shaped pin hole are processed in sequence.
Preferably, when the pin holes are electrolyzed, the processing positions of the two pin holes at the same time are symmetrical about the center line of the piston.
Preferably, when the pin hole is electrolyzed, the diameter DN of the cylindrical section pin hole of the formed pin hole is taken, and the distance from the inner end point of the cylindrical section pin hole of the formed pin hole to the center of the piston is taken as XN 0 Taking the distance from the outer end point of the cylindrical section pin hole of the formed pin hole to the center of the piston as XW 0 Taking the distance from any section of the curved surface section of the formed pin hole to the center of the piston as Xn;
according to Dn = DN + λ (XN) 0 -Xn) 2 or Dn = Dn + λ ((XW) 0 -Xn) 2, calculating any section diameter of the curved section forming the pin hole, wherein λ ranges from 0.00015 to 0.0005.
A piston pin hole machining device, comprising: the device comprises a computer, an electrolysis device, a first combined cathode, a second combined cathode, a positioning device, a straight pin Kong Tangxiao device and a piston cleaning device, wherein the first combined cathode and the second combined cathode are respectively connected with the computer.
Preferably, the electrolysis device comprises a first combined cathode and a second combined cathode, wherein the first combined cathode comprises a plurality of first cathodes and a plurality of first insulating pieces, all the first cathodes are arranged side by side, and the first insulating pieces are arranged between every two adjacent first cathodes; the second combined cathode comprises a plurality of second cathodes and a plurality of second insulating pieces, all the second cathodes are arranged side by side, and the second insulating pieces are arranged between every two adjacent second cathodes.
Preferably, a first through groove corresponding to the position of the first piston retainer ring groove is formed in the periphery of the first cathode, the first through groove is provided with a plurality of first through holes arranged along the circumferential direction of the first cathode, and the axes of all the first through holes are respectively arranged along different radial directions of the first cathode;
and a second through groove corresponding to the position of the second piston retainer ring groove is formed in the periphery of the second cathode, a plurality of second through holes are formed in the second through groove and are arranged along the circumferential direction of the second cathode, and the axes of all the second through holes are respectively arranged along different radial directions of the second cathode.
A piston comprising a piston head, a piston skirt, and piston pin holes provided on both sides of the piston skirt, wherein the piston pin holes are machined by the piston pin hole machining apparatus described in any one of the above, and the piston pin holes have the shape of the molding pin hole according to claim 7.
The piston pin hole machining method provided by the application is changed from the original three processes of boring the outer step of the pin hole, milling the inner chamfer of the pin hole and boring the special-shaped pin hole into one process of the electrolytic pin hole, and simultaneously, burrs are not generated after machining, so that the deburring process is omitted; the process flow is shorter, and the processing efficiency is higher. The electrolytic machining tool has small abrasion and good consistency, and can obviously save long-term cost; the piston pin hole is electrolytically machined, the machined piston material is free of heat influence and does not have a boring hardened layer, the surface oleophylic capability after electrolytic treatment is better, and the oil storage capability of the piston pin hole is improved; the electrolytic machining of the piston pin hole is non-contact machining, the machining cathode is not stressed, the piston clamping force is small, the boring force caused by periodic vibration of a boring intermittent machining cutter is avoided, the stress strain of the piston pin hole is small, and the deformation of the machined pin hole is small.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a piston pin bore machining method provided by the present invention;
FIG. 2 is a schematic illustration of an electrolysis piston pin bore provided in accordance with the present invention;
FIG. 3 is a schematic view of parameters in a calculation formula for any diameter of a curved surface section of a forming pin hole provided by the present invention;
FIG. 4 is a schematic diagram of an exemplary pin bore electrolysis scheme provided by the present invention.
In FIGS. 1-4:
1-piston, 2-first insulating part, 3-first cathode, 4-electrolysis product, 5-first through hole, 6-first through groove, 7-electrolyte flow direction, 8-pin hole outer step, 9-first piston retainer groove, 10-special-shaped pin hole and 11-pin hole inner chamfer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The core of the invention is to provide a piston pin hole processing method, a device and a piston, the pin hole is processed by the piston pin hole processing method and the device, no burr is left after processing, the process flow is shorter, the processing efficiency is faster, the consistency is good, and the long-term cost is saved; the clamping force of the piston 1 is small, the boring force of periodic vibration of a boring intermittent machining cutter is avoided, the stress strain of a pin hole of the piston 1 is small, and the deformation of the processed pin hole is small.
Referring to fig. 1 to 4, a method for processing a piston pin hole includes:
s1: positioning the piston 1;
s2: boring a straight pin hole of the piston 1, and reserving the boring machining allowance of the straight pin hole;
s3: processing a straight pin hole into a forming pin hole in an electrolytic pin hole mode;
s4: the piston 1 is cleaned.
It should be noted that, the piston 1 needs to be positioned when boring or when boring the electrolysis pin hole, the positioning mode can be set according to the geometric structure of the piston 1, the straight pin hole is bored by roughly machining the pin hole according to the preset pin hole position, and coaxial cylindrical straight pin holes are respectively machined on both sides of the piston 1.
The boring allowance of the straight pin hole is that for the straight pin hole relative to the forming pin hole, the diameter of the cylindrical section of the forming pin hole is larger than that of the straight pin hole, and the difference diameter between the cylindrical section of the forming pin hole and the straight pin hole is the boring allowance of the straight pin hole. The straight pin hole can be further finely machined by setting a boring allowance.
The mode of the electrolysis pin hole is that the piston 1 is arranged in an electrolysis device, an electrode for electrolysis is arranged in the straight pin hole, and two straight pin holes are gradually processed in an electrolysis mode so as to process a formed pin hole.
The surface of the pin hole processed by adopting an electrolysis mode has better oil storage capacity; the molded pin hole profile after electrolysis is more round without machining groove-shaped lines, and the surface characteristic is more suitable for high-pressure heavy-load transmission of a pin hole and piston pin friction pair.
In order to improve the machining precision, the piston 1 is cleaned after the straight pin hole is bored and after the electrolysis pin hole is bored, so that the cleanliness can be ensured, and the influence of impurities on machining during the electrolysis pin hole can be eliminated.
The piston pin hole processing method provided by the application is changed from three processes of boring the pin hole outer step 8, milling the chamfer 11 in the pin hole and boring the special-shaped pin hole 10 into one process of electrolyzing the pin hole, and simultaneously, burrs are not generated after processing, so that the deburring process is omitted; the process flow is shorter, and the processing efficiency is higher. The electrolytic machining tool has small abrasion and good consistency, and can obviously save long-term cost; the pin hole of the piston 1 is electrolytically machined, the machined piston 1 is free of heat influence and does not have a boring hardened layer, the surface oleophylic capability after electrolytic treatment is better, and the oil storage capability of the pin hole of the piston 1 is improved; the electrolytic machining of the pin hole of the piston 1 is non-contact machining, the machining cathode is not stressed, the clamping force of the piston 1 is small, the boring force of periodic vibration of a boring intermittent machining cutter is avoided, the stress strain of the pin hole of the piston 1 is small, and the deformation of the processed pin hole is small.
In addition to the above-described embodiments, it is further preferable that the positioning piston 1 includes: when the straight pin hole is bored, the piston 1 is positioned, and when the pin hole is electrolyzed, the piston 1 is positioned, so that the accuracy when the straight hole is bored is improved, the coaxiality of the pin holes on two sides is ensured, the symmetry of the pin holes on two sides is ensured, and the processing quality of the pin hole is improved.
On the basis of the above embodiment, the mode of positioning the piston 1 may adopt the following preferable mode, when boring the straight pin hole, the piston 1 is positioned by the piston top surface, the piston outer circle and the pin hole bottom hole; and when the pin hole is electrolyzed, the piston 1 is positioned by the top surface of the piston, the excircle of the piston and the straight pin hole after boring. The top surface of the piston is a plane, the excircle of the piston is a drum ellipse, the position of a bottom hole of a pin hole is fixed, three positioning reference positions are machined surfaces, and the positioning precision is high; the two straight pin holes after boring are consistent in structure and are symmetrical about the center line of the piston 1, and the position accuracy of the piston 1 can be improved by adding the two straight pin holes as positioning reference positions.
In addition to the above embodiments, as a further preferred, when boring the straight pin hole, the boring allowance of the straight pin hole relative to the cylindrical section of the forming pin hole is 0-0.3mm, and optionally, the boring allowance may be set to other values or value ranges according to actual machining conditions.
In order to improve the processing quality of the pin hole, on the basis of the above embodiment, as a further preferable mode, when the pin hole is electrolyzed, the pin hole outer step 8, the pin hole inner chamfer 11 and the special-shaped pin hole 10 are sequentially processed, so that the electrolytic product can be smoothly and timely discharged at a high speed by sequentially processing the pin hole, the quality of the electrolytic solution at the processing part can be maintained, and the processing precision of each section of the pin hole can be ensured. Of course, other sequences of machining may be performed depending on the actual machining conditions.
In order to further improve the quality of the pin hole machining, in the above embodiment, it is further preferable that the machining positions of the two pin holes at the same time are symmetrical with respect to the center line of the piston 1 in the case of electrolyzing the pin hole.
In order to solve the above problems, in the above embodiment, it is further preferable that, in the case of the pin hole electrolysis, the diameter DN of the cylindrical pin hole section of the molding pin hole is taken, and the distance XN between the inner end point of the cylindrical pin hole section of the molding pin hole and the center of the piston 1 is taken as 0 Taking the distance from the outer end point of the cylindrical section pin hole of the formed pin hole to the center of the piston 1 as XW 0 Taking the distance from any section of the curved surface section of the formed pin hole to the center of the piston 1 as Xn;
according to Dn = DN + λ [ (XN) ] 0 -Xn) 2 or Dn = Dn + λ ((XW) 0 -Xn) 2, calculating any section diameter of the curved section forming the pin hole, wherein λ ranges from 0.00015 to 0.0005.
The principle of the electrolysis pin hole is the Faraday principle, and the electrolysis precision of the piston is related to the clearance between the cathode and the inner wall of the pin hole, the piston material, the concentration of the electrolyte, the processing time and the like. The technical scheme establishes a mathematical model for the pin hole profile, and the mathematical model is combined with a Faraday principle, so that automatic control processing of a computer system can be realized. If the mathematical model provided by the scheme is not adopted, a large number of tests are required to be carried out on the processing of different pin hole shapes during each processing, and the debugging time can be saved by establishing the mathematical model.
The pin holes are processed by the method, so that burrs can be avoided, the processing precision of the pin holes is further improved, the pin holes have high surface performance quality, the molded surfaces of the pin holes do not have micro steps, the curved surfaces of the special-shaped pin holes are smoother, the theoretical design requirements are approached, and the pressure bearing capacity of the pin holes of the piston 1 is improved.
In addition to the above piston pin hole processing method, the present invention also provides a piston pin hole processing apparatus, comprising: the device comprises a computer, an electrolysis device, a positioning device, a straight pin Kong Tangxiao device and a piston cleaning device, wherein the electrolysis device is connected with the computer. The piston pin hole machining device can be applied to the piston pin hole machining method disclosed by any one of the embodiments, in order to realize automatic control and improve efficiency, the piston 1 can be positioned by the computer-controlled positioning device, the straight pin hole boring machining is performed on the piston 1 by the computer-controlled straight pin hole boring device, the piston 1 is cleaned by the computer-controlled piston cleaning device, and the computer controls the electrolysis device to perform electrolysis machining on the pin hole of the piston 1, so that the accuracy in electrolysis machining can be improved, the pin hole machining quality is improved, burrs are avoided, and the machining efficiency is improved.
On the basis of the above embodiment, as a further preferable mode, the electrolysis apparatus includes a power supply, an electrolyte, a first combined cathode and a second combined cathode, the first combined cathode includes a plurality of first cathodes 3 and a plurality of first insulating members 2, all the first cathodes 3 are arranged side by side, and the first insulating members 2 are arranged between every two adjacent first cathodes 3; the second combined cathode comprises a plurality of second cathodes and a plurality of second insulating pieces, all the second cathodes are arranged side by side, and the second insulating pieces are arranged between every two adjacent second cathodes.
When machining is carried out, the piston 1, the first combined cathode and the second combined cathode are arranged in the electrolytic device, the first combined cathode is arranged in a straight-line arrangement in a straight pin hole on one side, the second combined cathode is arranged in a straight-line arrangement in a straight pin hole on the other side, when electrolysis is carried out, each first cathode 3 and each second cathode are connected with a computer, each first cathode 3 and each second cathode can independently carry out electrolysis work, and each cathode is machined in sequence or repeatedly combined and machined to achieve the required machining shape and precision. The initial clearance between the first cathode 3 and the pin hole cylindrical section pin hole wall and the initial clearance between the second cathode and the pin hole cylindrical section pin hole wall are 0.01-0.2mm.
The electrolysis device also comprises a device for driving the electrolyte to flow directionally, regularly, quantitatively and at a high speed, and when the electrolysis device is used for carrying out electrolysis processing on the piston 1, an electrolysis product 4 under electrolysis can be generated near the piston 1, and the flow direction of the electrolyte is controlled by the device, so that the electrolysis product 4 generated by the electrolysis processing can flow to the outer side of the piston 1 along the vicinity of the piston 1 along with the electrolyte, the removal of the electrolysis product 4 is completed, the electrolysis part is kept from being interfered by the electrolysis product 4 during electrolysis, and the quality of the electrolysis processing is prevented from being influenced.
When the piston 1 is used, the first cathode 3, the second cathode and the piston 1 are placed in an electrolysis device, the first cathode 3, the second cathode and the piston 1 are respectively connected with a computer, a power supply can provide current for the first cathode 3, the second cathode and the piston 1, the electrolysis cathode and the piston 1 are respectively connected with two poles of the power supply, each first cathode 3 and each second cathode correspond to different parts to be processed of the piston 1, after the first cathode 3, the second cathode and the piston 1 are electrified, the piston is processed by utilizing the dissolution of an anode, namely a piston pin hole, in the electrochemical reaction process, the oxidized position of the piston 1 can be changed structurally, so that all the first cathodes 3 and all the second cathodes process the piston 1, and as a control system can independently control each first cathode 3 and each second cathode individually, all the first cathodes 3 and all the second cathodes can produce the same or different processing effects on the piston 1, and finally the position structures of all the first cathodes 3 and all the second cathodes corresponding to the piston 1 are processed into the required structures.
According to the method, the piston 1 is machined by adopting the electrolysis device, the machining process is controlled by a computer, and the piston 1 is machined into a finished product, so that the machining efficiency is higher than that of machining, and no burr is generated after machining; the first cathode 3 and the second cathode have small loss and good product consistency, and long-term cost can be remarkably saved; the electrolytic machining mode is non-contact machining, so that the cutting force caused by periodic vibration of a mechanical intermittent machining cutter is avoided, and the machining stress strain is small; the computer can control each first cathode 3 and each second cathode individually, and the requirement of high-difficulty processing of the piston 1 is met.
The first cathodes 3 and the second cathodes are both annular cathodes, all the first cathodes 3 are arranged in a straight line, all the second cathodes are arranged in a straight line, and the axes of all the annular cathodes are collinear. The number of the annular cathodes is x, all the annular cathodes are distributed in a straight line, and the annular cathodes are used for machining straight holes of the piston.
When the annular cathode is adopted to process the straight hole of the piston, the annular cathode and the piston 1 are controlled to be fixed in position to process the straight hole, large clamping force does not need to be applied to the piston 1, the controlled electrolyte is used for discharging electrolysis products and electrolysis heat rapidly in a directional and quantitative mode, a small-gap electrolysis process can be adopted to the maximum extent, and therefore machining precision is improved.
On the basis of the above embodiment, as a further preferable preference, the periphery of the first cathode 3 is provided with a first through groove 6 corresponding to the position of the first piston retainer groove 9, the first through groove 6 is provided with a plurality of first through holes 5 arranged along the circumferential direction of the first cathode 3, and the axes of all the first through holes 5 are respectively arranged along different radial directions of the first cathode 3;
and a second through groove corresponding to the position of the second piston retainer ring groove is formed in the periphery of the second cathode, a plurality of second through holes are formed in the second through groove and are arranged along the circumferential direction of the second cathode, and the axes of all the second through holes are respectively arranged along different radial directions of the second cathode. The pin hole respectively sets up a piston retainer ring groove about, because first logical groove 6 corresponds with first piston retainer ring groove 9 position, the second leads to groove and second piston retainer ring groove position and corresponds, and first piston retainer ring groove 9 and second piston retainer ring groove all need not electrochemical machining, electrify electrolyte in the first through-hole 5, electrolyte is followed in the first through-hole 5 from the first negative pole 3 inboard side to the first negative pole 3 outside high-speed blowout, electrolyte flows away toward the tip of first negative pole 3 fast, the electrolyte that has the electrolysis product does not participate in electrochemical machining again, in order to avoid influencing the manufacturing accuracy. The electrolyte with the electrolysis product enters the secondary filtering system immediately after working and then works circularly, the electrolyte is fed into the second through hole, the electrolyte is sprayed out from the inner side of the second cathode to the outer side of the second cathode at high speed along the second through hole, the electrolyte flows away from the end part of the second cathode quickly, and the electrolyte with the electrolysis product does not participate in electrolytic machining any more so as to avoid influencing the manufacturing precision. The electrolyte with the electrolysis product enters the secondary filtering system immediately after working, and then works circularly, so that the continuous supply of clean electrolyte is realized.
A through groove 6 is arranged on the periphery of the annular cathode, the working surface is an excircle, and the annular cathode is inserted into a straight hole of the piston 1 so as to machine the straight hole into a forming pin hole; through set up logical groove 6 in the periphery of annular cathode, supply the electrolyte circulation during electrolytic machining, guarantee the processing effect. The forming pin hole is processed by the electrolysis of the annular cathode, the through groove 6 arranged on the periphery of the annular cathode can increase the circulation volume and the circulation speed of the electrolyte, the stability of the electrolyte is kept, and the size consistency of the piston 1 is good.
The forming pin hole is a curved surface special-shaped hole, the shape of a common cathode cannot be copied to a workpiece in a mirror image mode, so that a plurality of cathodes are adopted for processing, the processing time and the processing sequence of each cathode are independently controlled by a computer, and then the required shape is achieved.
In addition to the above-mentioned embodiments, it is further preferable that the first combined cathode and the second combined cathode have a structure symmetrical with respect to a center line of the piston 1. The symmetrical arrangement structure of the processing tool can ensure that the processing shapes of the pin holes of the two pistons 1 are consistent, and the symmetry of the pin holes of the pistons 1 is improved.
In addition to the piston pin hole machining device, the invention also provides a piston, which comprises a piston head main body and piston pin holes arranged on two sides of the piston head main body, wherein the piston pin holes are machined through the piston pin hole machining device disclosed by any one of the embodiments, and the piston pin holes are in the shapes of the formed pin holes in the embodiments.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The piston pin hole processing method, the piston pin hole processing device and the piston provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (11)
1. A piston pin hole machining method is characterized by comprising the following steps:
a positioning piston (1);
boring a straight pin hole of the piston (1), and reserving the boring machining allowance of the straight pin hole;
processing the straight pin hole into a forming pin hole in an electrolytic pin hole mode;
the piston (1) is cleaned.
2. The piston pin bore machining method according to claim 1, characterized in that the positioning piston (1) includes:
when boring straight pinhole, positioning piston (1) and electrolysis pinhole, positioning piston (1).
3. The piston pin hole machining method according to claim 2, wherein the piston (1) is positioned with the top surface of the piston, the outer periphery of the piston, and the bottom hole of the pin hole when boring the straight pin hole; and when the pin hole is electrolyzed, the piston (1) is positioned by the top surface of the piston, the excircle of the piston and the straight pin hole after boring.
4. The method of claim 1, wherein when boring the straight pin hole, a boring allowance of the straight pin hole with respect to the cylindrical section of the formed pin hole is 0 to 0.3mm with respect to the cylindrical section of the formed pin hole.
5. The method of machining a piston pin hole according to claim 1, wherein an outer pin hole step (8), an inner pin hole chamfer (11), and a modified pin hole (10) are sequentially machined during the electrolysis of the pin hole.
6. The method of machining a piston pin hole according to claim 1, wherein the machining positions of the two pin holes at the same time are symmetrical with respect to a center line of the piston (1) when the pin hole is machined.
7. The method for machining the piston pin hole according to claim 1, wherein the diameter DN of the cylindrical pin hole section of the formed pin hole is taken when the pin hole is electrolyzed, and the distance from the inner end point of the cylindrical pin hole section of the formed pin hole to the center of the piston (1) is taken as XN 0 Taking the distance from the outer end point of the cylindrical section pin hole of the formed pin hole to the center of the piston (1) as XW 0 Taking the distance from any section of the curved surface section of the molding pin hole to the center of the piston (1) as Xn;
according to Dn = DN + λ (XN) 0 -Xn) 2 or Dn = Dn + λ ((XW) 0 -Xn) 2, calculating any section diameter of the curved section forming the pin hole, wherein λ ranges from 0.00015 to 0.0005.
8. A piston pin hole processingequipment which characterized in that includes: the device comprises a computer, an electrolysis device, a first combined cathode, a second combined cathode, a positioning device, a straight pin Kong Tangxiao device and a piston cleaning device, wherein the first combined cathode and the second combined cathode are respectively connected with the computer.
9. The piston pin hole machining device according to claim 8, characterized in that the electrolysis device comprises a first combined cathode and a second combined cathode, the first combined cathode comprises a plurality of first cathodes (3) and a plurality of first insulators (2), all the first cathodes (3) are arranged side by side, and the first insulators (2) are arranged between every two adjacent first cathodes (3); the second combined cathode comprises a plurality of second cathodes and a plurality of second insulating pieces, all the second cathodes are arranged side by side, and the second insulating pieces are arranged between every two adjacent second cathodes.
10. The piston pin hole machining device according to claim 9, characterized in that a first through groove (6) corresponding to the position of a first piston retainer groove (9) is formed in the periphery of the first cathode (3), a plurality of first through holes (5) are formed in the first through groove (6) and arranged along the circumferential direction of the first cathode (3), and the axes of all the first through holes (5) are respectively arranged along different radial directions of the first cathode (3);
and a second through groove corresponding to the position of the second piston retainer ring groove is formed in the periphery of the second cathode, a plurality of second through holes are formed in the second through groove and are arranged along the circumferential direction of the second cathode, and the axes of all the second through holes are respectively arranged along different radial directions of the second cathode.
11. A piston comprising a piston head, a piston skirt, and piston pin holes provided on both sides of the piston skirt, wherein the piston pin holes are machined by the piston pin hole machining method according to any one of claims 1 to 7, and the piston pin holes have the shape of the formed pin holes according to claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210993866.1A CN115178818A (en) | 2022-08-18 | 2022-08-18 | Piston pin hole machining method and device and piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210993866.1A CN115178818A (en) | 2022-08-18 | 2022-08-18 | Piston pin hole machining method and device and piston |
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| Publication Number | Publication Date |
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| CN115178818A true CN115178818A (en) | 2022-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210993866.1A Pending CN115178818A (en) | 2022-08-18 | 2022-08-18 | Piston pin hole machining method and device and piston |
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| Country | Link |
|---|---|
| CN (1) | CN115178818A (en) |
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- 2022-08-18 CN CN202210993866.1A patent/CN115178818A/en active Pending
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