CN114367839B - Finish machining tool and tool for plunger hole of plunger pump and machining method of finish machining tool and tool - Google Patents
Finish machining tool and tool for plunger hole of plunger pump and machining method of finish machining tool and tool Download PDFInfo
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- CN114367839B CN114367839B CN202111017868.9A CN202111017868A CN114367839B CN 114367839 B CN114367839 B CN 114367839B CN 202111017868 A CN202111017868 A CN 202111017868A CN 114367839 B CN114367839 B CN 114367839B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/24—Perforating, i.e. punching holes
- B21D28/34—Perforating tools; Die holders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Details Of Reciprocating Pumps (AREA)
Abstract
The invention discloses a finish machining process of a plunger hole of a plunger pump, which comprises the following steps of firstly, machining the plunger hole at the position of a pump lobe plunger hole of the plunger pump, secondly, machining the step hole, thirdly, machining the groove by adopting linear cutting, fourthly, performing thermal refining, fifthly, reaming the plunger hole in the first step, and sixthly, performing roll finishing on the plunger hole by using a roll finishing cutter; step seven, using a roll finishing cutter to roll finish the step hole; and step eight, punching the plunger hole by using a punching cutter. The beneficial effects of the invention are as follows: the method realizes the correction of the coaxiality and cylindricity of the intermittent plunger hole, increases the surface finish of the plunger hole wall, improves the consistency of the matching tolerance of the plunger and the plunger hole, and further improves the oil film sealing effect between the plunger and the plunger hole.
Description
Technical Field
The invention belongs to the technical field of plunger pump machining technology, and particularly relates to a plunger pump plunger hole finish machining tool and a plunger pump plunger hole finish machining method.
Background
The non-standard plunger pump is designed according to actual products by utilizing a plunger pump principle, and the plunger pump is a small and miniature plunger pump which integrates an oil tank, the plunger pump and a hydraulic cylinder and is applied to an electric tool. Because the output of the plunger pump is smaller and the processing scale of the plunger pump changes at any time according to the model of the electric tool, the plunger pump is in small batch production, meanwhile, because the plunger pump is provided with three annular pump segments which are uniformly distributed on the circumference by taking the axis of the plunger pump body as a reference, each pump segment is provided with a plunger hole, the plunger hole is a stepped hole with the axis pointing to the axis of the plunger pump body, the step of the stepped hole is arranged in the middle part of the outer arc surface of the pump segment, and a groove vertical to the axis of the plunger hole is arranged near the inner circular surface.
In view of the foregoing, there is an urgent need for a tool and a tool for finishing a plunger hole of a plunger pump and a method for machining the plunger hole of the plunger pump to achieve the machining quality of the plunger hole of the small and miniature plunger pump of an electric tool, and to improve the oil film sealing effect between the plunger and the plunger hole.
Disclosure of Invention
The aim of the invention is to: the processing quality of the plunger hole processing of the small miniature plunger pump of the electric tool is realized, and the oil film sealing effect between the plunger and the plunger hole is improved.
In order to achieve the above object, the present invention provides a finishing tool and tool for a plunger hole of a plunger pump and a machining method thereof.
The specific technical scheme adopted by the invention is as follows:
the utility model provides a finish machining technology in plunger hole of plunger pump, be equipped with three fan ring pump lamella on the plunger pump, the pump lamella uses the plunger pump body axis as the benchmark, circumference equipartition, is equipped with a plunger hole on every pump lamella, and the plunger hole is the step hole of the directional plunger pump body axis of axis, and the step in step hole sets up at pump lamella outer arc surface middle part, is close to interior round surface department and is equipped with the slot of perpendicular to plunger hole axis, the finish machining technology in plunger hole includes the following steps:
step one, machining plunger holes at the positions of pump valve plunger holes of the plunger pump, pre-drilling holes by 5.4mm-5.6 mm, and reaming holes to 5.7mm-5.8mm.
Step two, processing the step hole, wherein the aperture is 11mm;
step three, machining the groove by adopting wire cutting;
quenching and tempering, wherein the hardness is HRC 26-35;
step five, reaming the plunger hole in the step one to 5.85-5.9 mm for the first time, reaming to 5.94-5.96 mm for the second time, and reaming to 5.97-5.98 mm for the third time;
step six, using a roll finishing cutter to roll finishing the plunger hole;
step seven, using a roll finishing cutter to roll finish the step hole;
step eight, punching the plunger hole by using a punching cutter, wherein the interference of the punching cutter to the plunger hole is 0.9mm-0.13mm;
step nine, performing second pass punching on the plunger hole with the out-of-tolerance measuring aperture;
step ten, cleaning burrs generated at the position of the truncated plunger hole in the step three;
step eleven, cleaning the plunger holes and the grooves.
By adopting the plunger hole processing technique, after the rough processing of the plunger hole is finished, the groove is processed by linear cutting, the stress around the plunger hole in the pump valve is released, and then the adjustment treatment is carried out, so that the particles of carbide of the material around the plunger hole are increased, the yield point and the tensile strength are reduced, the hardness and the brittleness are reduced, the elongation and the shrinkage rate are increased, and the internal stress generated by quenching is eliminated, so that the expected mechanical property is obtained.
The quality of the steel can be greatly adjusted by tempering, the strength, the plasticity and the toughness of the steel are good, and the steel has good comprehensive mechanical properties. And obtaining tempered sorbite after quenching and tempering. The tempered sorbite is formed by martensite during tempering, and can be distinguished by amplifying the martensite by more than 500-600 times under an optical microscope, and is a composite structure of carbide pellets distributed in a ferrite matrix. It is also a tempered structure of martensite, which is a mixture of ferrite and particulate carbide.
After quenching and tempering, the material around the plunger hole meets the mechanical requirement of plunger Kong Youmo sealing, then reaming processing is carried out, the coaxiality deviation of the plunger hole caused by processing grooves is corrected in the process, after the grooves are cut, the coaxiality of the two sections of plunger holes meets the matching requirement of the plunger hole and the plunger, and the problems that when the plungers caused by different axes are matched in the plunger hole, the gap between the plungers and the plunger hole is uneven, so that an oil film is sealed unevenly, and the oil film sealing effect is reduced are solved.
And (3) reaming three times within the range of the reserved machining allowance, reserving allowance of 0.02mm-0.04mm, punching by a punching cutter, wherein the interference of the punching cutter on the plunger hole is 0.9mm-0.13mm, the punching cutter and the inner wall of the plunger hole generate extrusion force perpendicular to the axis of the plunger hole and thrust force parallel to the axis of the plunger hole, under the action of the extrusion force and the thrust force, the surface layer of the inner wall of the plunger hole is subjected to plastic deformation in the radial direction and the axial direction, lattice distortion, dislocation and twin crystals are generated on the surface layer of the inner wall of the plunger hole, cold work hardening phenomenon occurs, and the strength and hardness are improved, so that a plastic deformation bright surface is formed.
In the first step, the hole is pre-drilled by 5.5mm and then reamed to 5.7mm;
in the fourth step, quenching and tempering are carried out, and the hardness is HRC 28-32;
in the fifth step, the plunger hole in the first step is reamed to 5.9mm for the first time, reamed to 5.95mm for the second time, and reamed to 5.97mm for the third time;
in the eighth step, the interference of the punching cutter to the plunger hole is 0.10mm-0.12mm;
as still further preferable of the present invention, in the step six, the plunger hole is subjected to roll finishing using a roll finishing cutter, and the interference of the roll finishing cutter to the plunger hole is 0.007mm to 0.02mm;
in the seventh step, a step hole is subjected to roll finishing by using a roll finishing cutter, and the interference of the roll finishing cutter to the plunger hole is 0.007mm-0.02mm;
as a further improvement of the invention, the punching cutter comprises a cutter handle and a burnishing section which is coaxial with the cutter handle and is sequentially arranged along the axial direction of the cutter handle, at least three correcting teeth and a plurality of annular burnishing teeth are sequentially arranged along the working feeding direction of the cutter, the at least three annular correcting teeth are sequentially annular conical first correcting teeth and at least two annular correcting cutting teeth along the working feeding direction of the cutter, the diameter of the large end of the first correcting teeth and the diameter of the at least two annular correcting cutting teeth are gradually increased along the working feeding direction of the cutter by a step of 0.005mm-0.01mm, the cross section of the burnishing teeth along the axial direction of the cutter is isosceles trapezoid, the waist of the isosceles trapezoid is deformed into an arc shape, the angle of the isosceles trapezoid is deformed into an arc shape, containing grooves for containing lubricating oil and chips are respectively arranged between the burnishing teeth and the adjacent teeth, the diameter of the burnishing teeth is gradually increased along the working feeding direction of the cutter by a step of 0.01mm-0.05mm, and the tolerance of the diameter of the burnishing teeth is +/-0.01 mm.
By adopting the design, the stamping knife and the inner wall of the plunger hole generate extrusion force perpendicular to the axis of the plunger hole and thrust parallel to the axis of the plunger hole, under the action of the extrusion force and the thrust in the two directions, the surface layer of the inner wall of the plunger hole generates plastic deformation in the radial direction and the axial direction, lattice distortion, dislocation and twin crystal are generated on the surface layer of the inner wall of the plunger hole, cold work hardening phenomenon occurs, the strength and the hardness are improved, thus forming a plastic deformation bright surface, wherein the at least three annular correction teeth are annular cone-shaped first correction teeth and at least two annular correction cutting teeth in sequence along the working feeding direction of a cutter, the diameter of the large end of the first correction teeth and the diameter of the at least two annular correction cutting teeth are gradually increased by 0.005mm-0.01mm along the working feeding direction of the cutter, when the annular correction teeth pass through the plunger hole, the annular cone-shaped first correction teeth guide the annular correction cutting teeth to pass through grooves, burrs at critical edges of the groove and the plunger hole are removed in the cutting mode, and the post is finished in the broaching mode, and the coaxiality and the surface quality of the plunger hole are further improved;
more advantageously, the cross section of the burnishing teeth along the axis is isosceles trapezoid, the waist of the isosceles trapezoid is deformed into arc shape, the angle of the isosceles trapezoid is deformed into arc shape, the accommodating grooves for accommodating lubricating oil and scraps are arranged between the burnishing teeth and the correcting teeth and between the adjacent teeth, the diameter of the burnishing teeth is gradually increased by 0.01mm-0.05mm along the working feeding direction of the cutter, and the tolerance of the diameter of the burnishing teeth is +/-0.01 mm, so that when the burnishing teeth pass through the plunger hole, the aperture of the plunger hole is gradually increased by gradual extrusion in a cutting mode, the burnishing teeth gradually reduce the surface roughness of the inner wall of the plunger hole, the aperture and the surface roughness Ra of the plunger hole reach design values, and the surface roughness of the through hole after machining can reach less than Ra1.6um. The accommodating grooves for accommodating lubricating oil and scraps are arranged between the burnishing teeth and the correcting teeth and between the adjacent teeth,
preferably, the diameter of the large end of the first correcting tooth and the diameters of the at least two annular correcting cutting teeth are increased by a step of 0.06mm or 0.08mm along the tool working feed direction, and the diameters of the burnishing teeth are increased by a step of 0.03mm or 0.04mm along the tool working feed direction.
The utility model provides a plunger pump's plunger hole finish machining frock, includes the base and fixes the plunger pump mount on the base, includes: the support frame includes rectangle and the vertical fixed dull and stereotyped and the fixed dull and stereotyped in back of preceding fixed dull and stereotyped and the fixed dull and stereotyped rectangle in back of parallel, and the up end of preceding fixed dull and stereotyped and the fixed dull and stereotyped rectangle in back is equipped with respectively fixed the U type groove of plunger pump, wherein the U type groove lower part both sides of preceding fixed dull and stereotyped are equipped with 120 contained angle about U type groove central symmetry's plunger hole fixed pin, and the U type groove lower part of preceding fixed dull and stereotyped is equipped with the breach of dodging of stamping knife.
By adopting the tool, the plunger hole of the plunger pump is vertically arranged on the workbench, at the moment, the special cutter punching tool is vertically arranged above the plunger hole, and external force is applied to the punching tool handle, so that the punching tool passes through the plunger hole, the aperture of the plunger hole is between 5mm and 7mm, and the punching operation of the punching tool can be realized by selecting a punching machine with the specification of 60 tons. Two sides of the lower part of the U-shaped groove of the front fixing flat plate are provided with plunger hole fixing pins which form an included angle of 120 degrees and are symmetrical with respect to the center of the U-shaped groove, the plunger holes of the plunger pump are fixed on the first vertical plane to fix the two pump petals below, so that the plunger holes of the third pump petal are ensured to be in the vertical direction, and the plunger holes are ready for punching by a punching cutter.
As a further improvement of the invention, a spring pull pin is arranged on one side of the front fixing plate, and when the plunger pump is fixed in the U-shaped groove, the spring pull pin is supported at the center of the three fan-shaped annular pump petals, and the end part of the spring pull pin is also provided with a through hole for avoiding the punching cutter.
By adopting the design, when the plunger pump is fixed in the tool, one side of the front fixing plate is provided with the spring pull pin, the spring pull pin is inserted into the middle of three pump petals, the pump petals are supported, the pump petals are prevented from deforming due to the stress of punching in the punching process, and the coaxiality and the surface quality of the plunger hole are further ensured.
As a further improvement of the invention, the rear fixing plate is provided with axial positioning fixing pins of the plunger pump, the number of the fixing pins is three, and the fixing pins are symmetrically distributed at the edge of the U-shaped groove at an included angle of 90 degrees.
By adopting the design, the plunger pump body is uniformly pressed on the front fixing flat plate, so that the plunger hole above the tool is further ensured to be in the vertical direction, and the plunger pump body is ready for punching by the punching tool.
The invention has the positive effects that:
the method realizes the correction of the coaxiality and cylindricity of the intermittent plunger hole, increases the surface finish of the plunger hole wall, improves the consistency of the matching tolerance of the plunger and the plunger hole, and further improves the oil film sealing effect between the plunger and the plunger hole.
Drawings
FIG. 1 shows a plunger pump to which the finishing tool and tool for plunger holes of the plunger pump and the machining method thereof are applied;
FIG. 2 is a front view of a finishing tool and tool for a plunger hole of a plunger pump and a tool in the method of the present invention;
FIG. 3 is an enlarged view of the finishing tool and tool for a plunger hole of a plunger pump and the tool at A in the method of machining the same of the present invention shown in FIG. 2;
FIG. 4 is a left side view of a finishing tool and tool for a plunger hole of the plunger pump shown in FIG. 2 and a method of machining the tool;
FIG. 5 is a rear view of a finishing tool and tool for a plunger hole of the plunger pump shown in FIG. 2 and a method of machining the tool;
FIG. 6 is a second embodiment of a finishing tool and tool for a plunger hole of a plunger pump and a method of machining the same according to the present invention;
fig. 7 is a schematic diagram of a tool and a tool for finishing a plunger hole of a plunger pump and a special tool in a machining method thereof.
Legend description: 1-plunger pump, 2-piston cylinder, 3-first location platform, 4-second location platform, 5-pump lamella, 501-step hole, 6-centre hole, 7-plunger hole, 8-slot, 9-base, 10-front fixed flat, 11-U type groove, 12-spring pin limit platform, 13-pin hole limit platform, 14-first spring, 15-spring pin, 16-middle seat, 17-second spring, 18-spring seat, 19-fixed tailstock, 20-rear fixed flat, 21-pin hole, 22-fixed pin, 23-spring pull pin, 24-handle, 25-fourth burnishing tooth, 26-third burnishing tooth, 27-second burnishing tooth, 28-first burnishing tooth, 29-third correction cutting tooth, 30-second correction cutting tooth, 31-first correction cutting tooth, 32-ring taper first correction tooth.
Detailed Description
The invention is described in detail below with reference to the attached drawings and the specific embodiments:
specific examples:
in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Specific implementations of the invention are described in detail below in connection with specific embodiments.
Detailed description of the preferred embodiments
The finishing process of the plunger hole comprises the following steps:
step one, machining plunger holes at positions of plunger holes 7 of three pump flaps 5 of the plunger pump 1 by using a machining center, pre-drilling 5.4, and reaming to 5.65mm.
Step two, processing three step holes 501 by using the same processing center, wherein the aperture is 11mm;
thirdly, processing three grooves 8 by adopting linear cutting, wherein the groove width is 3mm;
fourthly, performing thermal refining, namely, heating the steel plate to the hardness HRC of 26-35 by using a plunger pump 1 at the temperature of 560 ℃ to 600 ℃, cooling the steel plate by using 10% saline solution with high cooling speed, and taking out the steel plate and cooling the steel plate to the room temperature by adopting a slow cooling mode when the temperature reaches 200 ℃ to 210 ℃;
step five, reaming the plunger hole 7 in the step one to 5.86mm for the first time, reaming to 5.95mm for the second time, and reaming to 5.96mm for the third time;
step six, using a roll finishing cutter to roll finishing the plunger hole, eliminating tool marks and improving the smoothness;
step seven, a roll finishing cutter is used for roll finishing the step hole 501, so that the cutter mark is eliminated, and the smoothness is improved;
step eight, punching the plunger hole by using a punching cutter, wherein the interference of the punching cutter to the plunger hole is 0.1mm;
step nine, performing second pass punching on the plunger hole with the out-of-tolerance measuring aperture;
step ten, cleaning burrs generated at the position of the truncated plunger hole in the step three;
and step eleven, cleaning the plunger holes and the grooves by using an ultrasonic cleaner.
Specific embodiment II:
on the basis of the first embodiment, the interference of the punching cutter to the plunger hole in the eighth step is 0.12mm.
Third embodiment:
the utility model provides a special stamping knife of finish machining in plunger hole, includes mutual coaxial according to the feed direction of work in proper order: the first correction tooth 32, the first correction cutting tooth 31, the second correction cutting tooth 30, the third correction cutting tooth 29, the burnishing section consisting of the first burnishing tooth 28, the second burnishing tooth 27, the third burnishing tooth 26 and the fourth burnishing tooth 25, and the tool shank 24, wherein the tool shank 24 has a length longer than the total length of the burnishing section, so that the tool shank can be continuously stressed when the burnishing section completely passes through the plunger hole, the first correction cutting tooth 31, the second correction cutting tooth 30 and the third correction cutting tooth 29 are all annular, the correction is realized by cutting edges of the tool shank, the first correction tooth 32 in the shape of a cone plays a role of guiding, the diameters of the annular cone-shaped first correction teeth 32, the first correction cutting teeth 31, the second correction cutting teeth 30 and the third correction cutting teeth 29 are gradually increased by 0.008mm in the cutter work feeding direction, the cross sections of the first burnishing teeth 28, the second burnishing teeth 27, the third burnishing teeth 26 and the fourth burnishing teeth 25 along the axes are isosceles trapezoids, the waists of the isosceles trapezoids are deformed into circular arcs, the angles of the isosceles trapezoids are deformed into circular arcs, containing grooves for containing lubricating oil and scraps are formed between the burnishing teeth and the correction teeth and between adjacent teeth, and the diameters of the first burnishing teeth 28, the second burnishing teeth 27, the third burnishing teeth 26 and the fourth burnishing teeth 25 are gradually increased by 0.03mm in the cutter work feeding direction, and the tolerance of the diameters of the burnishing teeth is +/-0.01 m.
Fourth embodiment:
the utility model provides a special frock of finish machining of plunger hole, the frock is exclusively used in installing on the workstation of punch press of specification 70 tons, the frock includes base 9, preceding fixed flat board 10 and back fixed flat board 20, all be equipped with U type groove 11 on preceding fixed flat board 10 and the back fixed flat board 20, wherein the second positioning platform 4 of plunger pump 1 is close to on the side of preceding fixed flat board 10, first positioning platform 3 is close to on the side of back fixed plane, the plunger pump presses between preceding fixed flat board 10 and back fixed flat board 20 this moment, simultaneously the bottom of U type groove 11 is close to the excircle of pump lamella 5, realize the location of digit direction, be equipped with spring pin 15 at preceding fixed flat board 10 both ends, spring pin 15 inserts the inside of step hole 501, realized the circumference location of pump lamella 5, because spring pin 15 becomes 120 contained angles about U type groove central symmetry, can only guarantee that the plunger hole 7 on the pump lamella 5 that waits to process keeps in vertical ascending position.
Fifth embodiment:
on the basis of the fourth embodiment, the spring pin 15 is provided with a secondary retraction structure, the secondary retraction structure sequentially comprises a first spring 14, a middle seat, a second spring 17, a spring seat 18 and a fixed tail seat 19 which are arranged in the spring pin 15 from one side of the U-shaped groove to the side direction of the front fixed flat plate 10, the tail seat 19 is used for fixing the first spring 14, the middle seat, the second spring 17 and the spring seat 18 in the pin hole 21 through threads, the end, close to the U-shaped groove, of the pin hole 21 is provided with a pin hole limiting table 13, the spring pin 15 is provided with a spring pin limiting table 12, the pin hole limiting table 13 and the spring pin limiting table 12 are matched to prevent the spring pin 15 from ejecting out of the pin hole 21, the elastic force of the first spring 14 is smaller than that of the second spring 17, when the spring pin 15 is stressed, the first spring 14 is compressed first, and when the stress is larger than that of the second spring 17, the second spring 17 starts to be compressed, and the scratch of the elastic force of the spring on the pump flap 5 can be reduced.
The foregoing has outlined broadly some of the aspects and features of various embodiments, which should be construed to be merely illustrative of various potential applications. Other beneficial results can be obtained by applying the disclosed information in a different manner or by combining various aspects of the disclosed embodiments. Other aspects and a more complete understanding of the exemplary embodiments may be derived by referring to the detailed description of the exemplary embodiments when considered in conjunction with the following figures, on the basis of the scope defined by the claims.
In addition, the invention also discloses the following technical scheme:
scheme one:
one side of the front fixing flat plate 10 is provided with a spring pull pin 23, the structure of the spring pull pin 23 is the same as that of the fifth embodiment, when the plunger pump 1 is fixed in the U-shaped groove 11, the spring pull pin is supported at the center of the three fan-shaped annular pump petals, namely, in the center hole 6, and the end part of the spring pull pin is also provided with a through hole for avoiding a punching cutter.
Scheme II:
the rear fixing plate 20 is provided with three axial locating fixing pins 22 of the plunger pump 1, and the fixing pins are symmetrically distributed at the edges of the U-shaped groove 11 at an included angle of 90 degrees.
The above embodiments illustrate the present invention in detail. The above description is not intended to limit the invention, but rather the invention is not limited to the examples described above, but is intended to cover all changes, modifications, additions or subtractions, and substitutions within the spirit and scope of the invention.
Claims (5)
1. The utility model provides a finish machining technology in plunger hole of plunger pump, be equipped with three fan ring pump lamella on the plunger pump, the pump lamella uses the plunger pump body axis as the benchmark, circumference equipartition, is equipped with a plunger hole on every pump lamella, and the plunger hole is the step hole that the axis points to the plunger pump body axis, and the step in step hole sets up at pump lamella outer arc surface middle part, is close to interior round surface department and is equipped with the slot of perpendicular to plunger hole axis, its characterized in that, the finish machining technology in plunger hole includes the following steps:
step one, machining plunger holes at the positions of pump valve plunger holes of a plunger pump, pre-drilling the holes with phi of 5.4 mm-phi of 5.6, and reaming the holes to phi of 5.7 mm-phi of 5.8mm;
step two, processing the step hole, wherein the aperture phi is 11mm;
step three, machining the groove by adopting wire cutting;
quenching and tempering, wherein the hardness is HRC 26-35;
step five, reaming the plunger hole in the step one to phi 5.85-phi 5.9mm for the first time, reaming to phi 5.94-phi 5.96mm for the second time, and reaming to phi 5.97-phi 5.98mm for the third time;
step six, using a roll finishing cutter to roll finishing the plunger hole;
step seven, using a roll finishing cutter to roll finish the step hole;
step eight, fixing a plunger pump on a tool, wherein the tool comprises a base and a plunger pump fixing frame fixed on the base, a supporting frame comprises a front fixing plate and a rear fixing plate which are rectangular and are vertically fixed on the base in parallel, U-shaped grooves for fixing the plunger pump are respectively formed in the upper end faces of the rectangular front fixing plate and the rectangular rear fixing plate, plunger hole fixing pins which form an included angle of 120 degrees and are symmetrical to the center of the U-shaped groove are arranged on two sides of the lower portion of the U-shaped groove of the front fixing plate, a clearance gap of a punching cutter is formed in the lower portion of the U-shaped groove of the front fixing plate, a spring pull pin is arranged on one side of the front fixing plate, when the plunger pump is fixed in the U-shaped groove, the spring pull pin is supported in the center of three fan-shaped pump petals, through holes for avoiding the punching cutter are formed in the end portions of the spring pull pin, the rear fixing plate is provided with axial positioning fixing pins of the plunger pump, and the number of the three plunger pump are symmetrically distributed on the edge of the U-shaped groove at an included angle of 90 degrees;
the plunger hole is punched through a punching cutter, and the interference of the punching cutter to the plunger hole is 0.9mm-0.13mm;
step nine, performing second pass punching on the plunger hole with the out-of-tolerance measuring aperture;
step ten, cleaning burrs generated at the position of the truncated plunger hole in the step three;
step eleven, cleaning the plunger holes and the grooves.
2. The finishing process of a plunger hole of a plunger pump according to claim 1, wherein: in the first step, after pre-drilling phi 5.5mm, reaming to phi 5.7mm;
in the fourth step, quenching and tempering are carried out, and the hardness is HRC 28-32;
in the fifth step, the plunger hole in the first step is reamed to phi 5.9mm for the first time, reamed to phi 5.95mm for the second time, and reamed to phi 5.97mm for the third time;
in the eighth step, the interference of the punching cutter to the plunger hole is 0.10mm-0.12mm.
3. The finishing process of a plunger hole of a plunger pump according to claim 2, wherein in the sixth step, a roll finishing cutter is used for roll finishing the plunger hole, and the interference of the roll finishing cutter to the plunger hole is 0.007mm-0.02mm;
and seventhly, rolling the step hole by using a rolling cutter, wherein the interference of the rolling cutter to the plunger hole is 0.007-0.02 mm.
4. The finishing process of a plunger hole of a plunger pump according to claim 3, wherein the punching cutter comprises a cutter handle and a burnishing section coaxial with the cutter handle, the burnishing section is sequentially provided with at least three correcting teeth and a plurality of annular burnishing teeth along the cutter work feeding direction, the at least three annular correcting teeth are sequentially annular cone-shaped first correcting teeth and at least two annular correcting cutting teeth along the cutter work feeding direction, the diameter of the large end of the first correcting teeth and the diameter of the at least two annular correcting cutting teeth are gradually increased along the cutter work feeding direction by a step difference of 0.005mm-0.01mm, the cross section of the burnishing teeth along the axis is isosceles trapezoid, the waist of the isosceles trapezoid is deformed into an arc shape, the angle of the isosceles trapezoid is deformed into an arc shape, the diameters of the burnishing teeth and the correcting teeth and the adjacent teeth are respectively provided with accommodating grooves for accommodating lubricating oil and chips, the diameters of the burnishing teeth are gradually increased along the cutter work feeding direction by a step difference of 0.01mm-0.05mm, and the tolerance of the burnishing teeth is 0.01 mm.
5. The finishing process of a plunger bore of a plunger pump according to claim 4, wherein the diameter of the large end of the first correction tooth and the diameters of the at least two annular correction cutting teeth are increased in a step difference of 0.06mm or 0.08mm in a tool working feed direction, and the diameters of the burnishing teeth are increased in a step difference of 0.03mm or 0.04mm in the tool working feed direction.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB697542A (en) * | 1951-05-23 | 1953-09-23 | Cav Ltd | Liquid fuel pumps |
| CN204381531U (en) * | 2015-01-28 | 2015-06-10 | 电光防爆科技股份有限公司 | The shaping push broach of burnishing-in and burnishing-in shaped device |
| CN205013273U (en) * | 2015-09-30 | 2016-02-03 | 无锡市德美嘉机械科技有限公司 | Hydraulic piston pump uses novel cylinder body |
| CN106392463A (en) * | 2016-11-22 | 2017-02-15 | 沈阳黎明航空发动机(集团)有限责任公司 | Stainless steel part high-precision hole finishing machining method |
| CN111673513A (en) * | 2020-07-15 | 2020-09-18 | 中国计量大学 | Universal CNC (computer numerical control) machine tool fixture for fixing outer cover of compressor |
-
2021
- 2021-09-01 CN CN202111017868.9A patent/CN114367839B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB697542A (en) * | 1951-05-23 | 1953-09-23 | Cav Ltd | Liquid fuel pumps |
| CN204381531U (en) * | 2015-01-28 | 2015-06-10 | 电光防爆科技股份有限公司 | The shaping push broach of burnishing-in and burnishing-in shaped device |
| CN205013273U (en) * | 2015-09-30 | 2016-02-03 | 无锡市德美嘉机械科技有限公司 | Hydraulic piston pump uses novel cylinder body |
| CN106392463A (en) * | 2016-11-22 | 2017-02-15 | 沈阳黎明航空发动机(集团)有限责任公司 | Stainless steel part high-precision hole finishing machining method |
| CN111673513A (en) * | 2020-07-15 | 2020-09-18 | 中国计量大学 | Universal CNC (computer numerical control) machine tool fixture for fixing outer cover of compressor |
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| CN114367839A (en) | 2022-04-19 |
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