CN110695622B - Copying processing method for complex shape and position of inlet eccentric shaft - Google Patents

Copying processing method for complex shape and position of inlet eccentric shaft Download PDF

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Publication number
CN110695622B
CN110695622B CN201910986312.7A CN201910986312A CN110695622B CN 110695622 B CN110695622 B CN 110695622B CN 201910986312 A CN201910986312 A CN 201910986312A CN 110695622 B CN110695622 B CN 110695622B
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epoxy resin
gear ring
processing
eccentric
inlet
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CN110695622A (en
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翁镇杰
林金桐
郭岳涛
林镇标
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Shantou Morgan Metallurgical Industry Co Ltd
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Shantou Morgan Metallurgical Industry Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/02—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/22—Component parts, details or accessories; Auxiliary operations
    • B29C39/26—Moulds or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/22—Component parts, details or accessories; Auxiliary operations
    • B29C39/42—Casting under special conditions, e.g. vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2063/00—Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

The invention provides a method for copying and processing complex shapes and positions of an inlet eccentric shaft, which specifically comprises the following steps: manufacturing a special die, casting a positioning inner ring, copying and processing an eccentric shaft and the like. The copying processing method for the complex shape and position of the inlet eccentric shaft has novel conception and ingenious design, fully utilizes the structural characteristics of the inlet eccentric sleeve, designs a special processing die, and utilizes the gear ring which is originally installed in the inlet eccentric sleeve as a butt joint piece during processing, thereby reducing the error during butt joint in the processing process to the maximum extent. By adopting the epoxy resin pouring mode, the epoxy resin positioning inner ring for processing the eccentric butt joint inner ring in the eccentric sleeve can be accurately manufactured, the outer shell central line, the inner tooth center line and the eccentric butt joint inner ring central line which are completely consistent with those in the inlet eccentric shaft can be accurately copied, the concentricity of the replaced part and the original part of the inlet eccentric sleeve is consistent, the precision of the domestic eccentric sleeve equipment and the precision of the inlet eccentric sleeve equipment are unified, and interchangeability is realized.

Description

Copying processing method for complex shape and position of inlet eccentric shaft
Technical Field
The invention relates to a method for copying and processing complex shapes and positions, in particular to a method for copying and processing complex shapes and positions of an inlet eccentric shaft.
Background
The structure of eccentric cover of import is as shown in fig. 1, mainly include front end 21, double tooth circle 22, middle section trompil portion 23 and four big subassemblies of back tip 24, wherein be connected through two ring gear 22 between front end 21 and the middle section trompil portion 23, front end 21 is provided with eccentric butt joint inner ring 25 through two ring gear 22 junctions with middle section trompil portion 23, it is whole set of change to belong to when the eccentric cover of import is changed, also need whole processing during processing, whole processing can make front end 21, the concentricity of three central lines of middle section trompil portion 23 and back tip 24 is unanimous, but the shortcoming is, the processing degree of difficulty is big, and it is single to pair, do not possess the interchange, in case damage appears in certain subassembly among four big subassemblies, then need whole change, all the other good subassembly parts also can't use, for example: if only the middle section opening part 23 is damaged (found in practical use, the part is most easily damaged), according to the current processing conditions, the whole four components of the front end part 21, the double-tooth ring 22, the middle section opening part 23 and the rear end part 24 need to be replaced, resources are wasted, especially, the structure of the middle section opening part 23 is complicated, if technical treatment is not carried out, even though the domestic most precise machine tool processing is used, complete matching cannot be realized, the reason is that, as shown in fig. 2, the structure of the middle section opening part 23 comprises an outer shell 231, an inner tooth part 232 and an eccentric butt joint inner ring 233, wherein the center line 100 of the outer shell, the center line 200 of the inner tooth part and the center line 300 of the eccentric butt joint inner ring are not coincident, independent processing cannot ensure the position precision of the center line 100 of the outer shell, the center line 200 of the inner tooth part and the center line 300, the replacement of the components cannot be realized, so that in the machining process, how to ensure that the machine tool realizes accurate machining on the premise that the center line 100 of the outer shell, the center line 200 of the inner gear part and the center line 300 of the eccentric butt joint inner ring are not coincident is a technical problem which needs to be solved urgently in the field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for duplicating the complex shape and position of an imported eccentric shaft, which can realize the independent processing of a part of the structure of an eccentric sleeve, so that the precision of domestic eccentric sleeve equipment and imported eccentric sleeve equipment is uniform, and the replacement of a part in the imported eccentric sleeve is realized.
In order to realize the technical scheme, the invention provides a method for copying and processing complex shapes and positions of an inlet eccentric shaft, which specifically comprises the following steps:
s1, manufacturing a special die,
s11, selecting die steel as a die bottom plate material, carrying out shape rough machining and then carrying out quenching and tempering treatment, carrying out ultra-precision flat grinding on two end surfaces of the bottom plate after quenching and tempering, and transferring the bottom plate to a CNC machining center for machining a central pouring hole, an assembling hole and a fabrication hole after the ultra-precision flat grinding;
s12, performing half-cutting on the double gear rings of the inlet eccentric sleeves, and performing ultra-high precision flat grinding on end faces to enable the two end faces of the gear rings to be parallel;
s13, mounting the gear ring on the bottom plate, ensuring the center line of the gear ring to be superposed with the center line of the bottom plate, and keeping the concentricity of the gear ring and the bottom plate consistent;
s14, processing a gland matched with the outer side face of the gear ring through a CNC (computer numerical control) processing center, wherein an inward bulge is arranged at the joint of the inner side of the gland and the central hole of the gear ring, the inward bulge is eccentric, and an annular cavity formed between the inward bulge of the gland and the central hole of the gear ring forms an epoxy resin pouring groove;
s2, positioning the pouring of the inner ring,
s21, adding the epoxy resin, the filler and the anhydride curing agent into a reaction kettle, stirring, vacuumizing and heating the reaction kettle, and stirring uniformly to obtain an epoxy resin castable;
s22, preheating the special mold prepared in the step S1, then placing the special mold into a vacuum casting tank, wherein the temperature of the special mold is slightly higher than that of the casting material, and after the vacuum casting tank is vacuumized, casting the epoxy resin casting material prepared in the step S21 into an epoxy resin casting groove of the special mold; after the pouring is finished, continuously vacuumizing, then closing the vacuum, opening the vacuum pouring tank, and conveying the special mold into a curing furnace for curing;
and S23, solidifying the poured special mold by using a curing furnace, taking out the special mold, cooling at room temperature, and separating the gland from the gear ring to form the epoxy resin positioning inner ring in the inner side of the gear ring in a pouring mode.
S3, copying and processing the eccentric shaft,
s31, meshing a domestic eccentric sleeve workpiece needing to be processed on the gear ring through the internal tooth part, and enabling the inner side of the domestic eccentric sleeve needing to be processed to be attached to the epoxy resin positioning inner ring in the gear ring;
s32, integrally clamping the assembled special die and the domestic eccentric sleeve workpiece on a machine tool for processing, and ensuring that the processed domestic eccentric sleeve workpiece and the imported eccentric sleeve equipment have uniform precision and interchangeability.
Preferably, in step S21, adding liquid epoxy resin and filler into a reaction kettle according to a mass ratio of 1:1, stirring for 5-10 minutes, so that the liquid epoxy resin and the filler are uniformly mixed, then adding an anhydride curing agent with a mass of 10% of that of the epoxy resin, vacuumizing the reaction kettle, maintaining a vacuum degree of 0.05-0.1MPa, heating to a temperature of 80-100 ℃, and stirring for 30-60 minutes, so as to obtain an epoxy resin castable, wherein the liquid epoxy resin is bisphenol a type epoxy resin, the anhydride curing agent is methyl tetrahydrophthalic anhydride, and the filler is asbestos fiber: quartz powder: the aluminum oxide is mixed according to the mass ratio of 5:4: 1.
Preferably, in the step S22, the special mold is preheated to 80-100 ℃ and then placed into a vacuum casting tank, the temperature of the special mold is slightly higher than the temperature of the casting material, the vacuum degree of the vacuum casting tank is reduced to below 1330Pa, the temperature of 80-100 ℃ is maintained, and then the epoxy resin casting material prepared in the step S21 is poured into an epoxy resin casting groove of the special mold; and after the pouring is finished, continuously vacuumizing for 5-10 minutes to remove bubbles formed in the pouring piece, closing the vacuum, opening the vacuum pouring tank, and conveying the special mold into a curing furnace for curing.
Preferably, in the step S23, the curing oven is used for curing at a temperature of 100 ℃ and 110 ℃ for 10-30 minutes.
Preferably, a plurality of assembling grooves which are distributed in a circumferential array by taking the center of the bottom plate pouring hole as the circle center are uniformly formed on the end edge of the special mold bottom plate.
Preferably, the bottom plate is further provided with a plurality of assembly long holes for fixedly mounting with external equipment.
Preferably, a plurality of screw holes are formed in the end face of the gear ring, a plurality of screw holes matched with the screw holes in the end face of the gear ring are formed in the pressing cover, and the gear ring is connected with the screw holes in the pressing cover through screws after being aligned.
Preferably, the gear ring and the bottom plate are fixed through screws.
The copying processing method of the complex shape and position of the inlet eccentric shaft provided by the invention has the beneficial effects that:
1) the copying processing method for the complex shape and position of the inlet eccentric shaft is novel in conception and ingenious in design, fully utilizes the structural characteristic of the inlet eccentric sleeve, and utilizes the characteristic that the front end part and the middle section opening part are butted through the double-tooth ring, so that the middle section opening part and the front end part can be separated actually. The copying and processing method for the complex shape and position of the imported eccentric shaft utilizes the characteristic to design a special processing die, and utilizes a gear ring which is originally installed in the imported eccentric sleeve as a butt joint piece when the domestic eccentric sleeve is processed, thereby reducing the error during butt joint in the processing process to the maximum extent.
2) According to the copying processing method for the complex shape and position of the imported eccentric shaft, the epoxy resin positioning inner ring for processing the eccentric butt joint inner ring in the eccentric sleeve can be accurately manufactured by adopting an epoxy resin pouring mode, the outer shell central line, the inner tooth part central line and the eccentric butt joint inner ring central line which are completely consistent with those in the imported eccentric shaft can be accurately copied, the concentricity of the replaced part and the original part of the imported eccentric sleeve is consistent, the domestic eccentric sleeve equipment and the imported eccentric sleeve equipment are uniform in precision, and interchangeability is achieved.
3) This duplication processing method of complicated form and position of import eccentric shaft only needs the internal tooth portion meshing of certain part in the eccentric cover that needs processing on this machining tool's inner circle, and process whole clamping on the lathe through the bottom plate, can be used for the middle section trompil portion or the preceding tip of the eccentric cover of independent processing import, need not the whole processing of equipment back, reduce the degree of difficulty of whole processing, can realize the change replacement of the eccentric cover subassembly of import after processing out the part of high accuracy, satisfy the demand of imported product localization, greatly reduced imported part's expense.
Drawings
Fig. 1 is a schematic perspective view of an inlet eccentric sleeve.
Fig. 2 is a schematic diagram of the center line alignment structure of the opening part in the middle section of the inlet eccentric sleeve.
Fig. 3 is a schematic perspective view of the special mold of the present invention.
FIG. 4 is a schematic view of the abutting structure of the special mold and the middle section opening part in the use process of the present invention.
In the figure: 1. a special mold; 11. a base plate; 12. a ring gear; 13. positioning the inner ring; 14. a gland; 15. assembling a groove; 16. assembling the long hole; 17. is raised inwards; 2. an eccentric sleeve; 21. a front end portion; 22. double gear rings; 23. a middle section opening part; 24. a rear end portion; 25. and eccentrically butting the inner ring.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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 obtained by a person skilled in the art without making any inventive step are within the scope of the present invention.
Example (b): a method for duplicating complex shapes and positions of an inlet eccentric shaft.
Referring to fig. 1 to 4, a method for duplicating complex shapes and positions of an inlet eccentric shaft specifically includes the following steps:
s1, manufacturing the special die 1,
s11, selecting die steel as a die bottom plate 11 material, and carrying out quenching and tempering after rough appearance machining, so that the bottom plate has good comprehensive mechanical properties and can be further subjected to fine machining; after tempering, performing ultra-precision flat grinding on two end surfaces of the bottom plate 11, wherein the two surfaces of the bottom plate 11 are parallel, and the parallelism reaches up to the precision of 0.025 mm; the ultra-precision flat grinding transfers the bottom plate 11 to a CNC machining center to manufacture complex hole sites, wherein the hole sites comprise a central pouring hole, an assembly groove 15, an assembly long hole 16 and the like, and the precision of each hole site is greatly improved by utilizing the mechanical precision of the CNC machining center;
s12, after half-cutting the double gear rings 22 of the imported eccentric sleeves, performing ultra-high precision flat grinding on the end surfaces to obtain the gear rings 12 of the special die 1, wherein the ultra-high precision flat grinding aims to enable the two end surfaces of the gear rings 12 to be parallel, the parallelism reaches 0.025mm precision, and the gear rings 12 obtained by cutting the original double gear rings 22 in the imported eccentric sleeves are used as butt-joint parts in the domestic eccentric sleeve processing, so that the error in the butt-joint process in the processing process is reduced to the maximum extent, the imported complex form and position can be better copied, and the error between the domestic eccentric sleeves and the imported eccentric sleeves in the subsequent monomer processing is smaller;
s13, mounting the gear ring 12 on the bottom plate 11, ensuring the center line of the gear ring 12 to be overlapped with the center line of the bottom plate 11, and keeping the concentricity of the gear ring 12 and the bottom plate 11 consistent;
s14, processing a gland 14 matched with the outer side surface of the gear ring 12 through a CNC (computer numerical control) processing center, fixing the gland 14 and the gear ring 12 through screws, arranging an inward bulge 17 at the joint of the inner side of the gland 14 and the central hole of the gear ring 12, setting the inward bulge 17 to be eccentric, forming an epoxy resin pouring groove in an annular cavity formed between the inward bulge 17 of the gland 14 and the central hole of the gear ring 12, and setting the epoxy resin pouring groove and the center of the gear ring 12 to be eccentric, so that the processing requirement of eccentric butt joint of an inner ring 25 in a subsequent processing piece can be met;
s2, positioning the pouring of the inner ring,
s21, adding liquid epoxy resin and a filler into a reaction kettle according to a mass ratio of 1:1, stirring for 10 minutes to uniformly mix the liquid epoxy resin and the filler, then adding an anhydride curing agent with the mass being 10% of that of the epoxy resin, vacuumizing the reaction kettle, keeping the vacuum degree at 0.06MPa, heating to 90 ℃, and stirring for 45 minutes to obtain the epoxy resin castable, wherein the liquid epoxy resin is bisphenol A epoxy resin, the anhydride curing agent is methyl tetrahydrophthalic anhydride, and the filler is asbestos fiber: quartz powder: the aluminum oxide is mixed according to the mass ratio of 5:4:1, the epoxy resin positioning inner ring obtained by adopting the formula for pouring has good toughness and impact resistance, the shrinkage rate of the epoxy resin positioning inner ring can be effectively reduced, and the epoxy resin positioning inner ring in the later processing process has good positioning accuracy;
in this embodiment, the performance of positioning the inner ring itself is very important, and good toughness and impact resistance are required during machining, and it is necessary to maintain no shrinkage and no deformation during long-time machining. In order to improve the performance of the positioning inner ring, the formula and the processing technology of the epoxy resin positioning inner ring are improved in the production process, a mode of twice material mixing is adopted, wherein liquid epoxy resin and filler are mixed to form a first material mixing, and a curing agent is added into the first material mixing to form a second material mixing. The first mixing is to fully soak the filler by resin, wherein the alumina and the quartz powder are materials with good heat conductivity, and can conduct the heat released by the reaction outwards without gathering, so that the internal stress of a casting is uniformly distributed without generating sink marks, and the addition of the asbestos fiber can effectively improve the toughness and the impact resistance of the epoxy resin positioning inner ring. The time of secondary mixing is to ensure that the curing agent is uniformly mixed, and the parameters of the temperature and the vacuum degree are also important. The viscosity of the mixture is rapidly increased due to overhigh temperature, so that the degassing and pouring process is influenced; the vacuum degree is used for ensuring the degassing and dehydration of the mixture, but the gasification of the curing agent cannot be caused, so the vacuum degree needs to be proper, and a large amount of experiments show that when the vacuum degree is 0.06MPa and the heating temperature is 90 ℃, the bonding force between the positioning inner ring of the obtained epoxy resin and the inner part of the gear ring is the best, and the performances such as toughness, impact resistance, shrinkage resistance and the like are the best.
S22, placing the special mold 1 prepared in the step S1 into a vacuum casting tank, wherein the mold is preheated to 85 ℃, the temperature of the special mold 1 is slightly higher than the temperature of the casting material, so that a uniform heat dissipation process is ensured in the casting material, the fluidity of the casting material is improved, the effect of the casting material is better when the casting material is molded, the vacuum degree of the vacuum casting tank is pumped to below 1330Pa, the temperature of 85 ℃ is maintained, and then the epoxy resin casting material prepared in the step S21 is poured into an epoxy resin casting groove of the special mold 1; after the pouring is finished, continuously vacuumizing for 8 minutes to remove bubbles formed in the pouring piece, then closing the vacuum, opening the vacuum pouring tank, and sending the special mold into a curing furnace for curing;
s23, curing for 20 minutes at the temperature of 105 ℃ by using a curing oven;
and S24, taking out the special die, placing the special die at room temperature for cooling, and then separating the gland 14 from the gear ring 12, so that the epoxy resin positioning inner ring 13 is cast and formed on the inner side of the gear ring 12. The epoxy resin positioning inner ring 13 is used for positioning the processing position of the eccentric butt joint inner ring 25 in the domestic eccentric sleeve processing, the epoxy resin positioning inner ring 13 is manufactured by adopting a pouring method, the bonding force between the epoxy resin positioning inner ring 13 and the inner part of the gear ring 12 can be improved, the processing error caused by the separation or position deviation of the epoxy resin positioning inner ring 13 and the gear ring 12 in the machining process can be prevented, the installation precision of the epoxy resin positioning inner ring 13 can be effectively enhanced, particularly, the outer shell central line, the inner gear central line and the eccentric butt joint inner ring central line which are completely consistent with those in the imported eccentric shaft can be accurately copied, the concentricity of the replaced part and the original part of the imported eccentric sleeve is consistent, the domestic eccentric sleeve equipment and the imported eccentric sleeve equipment are uniform in precision, and interchangeability is achieved.
S3, copying and processing the eccentric shaft,
s31, meshing a domestic eccentric sleeve workpiece needing to be processed on the gear ring 12 through the internal tooth part, and enabling the inner side of the domestic eccentric sleeve to be attached to the epoxy resin positioning inner ring 13 in the gear ring 12; the replacement of the domestic eccentric sleeve and the imported eccentric sleeve is realized, the core position of the method is at the joint of the gear ring 12, because the eccentric butt joint inner ring 25 at the joint of the gear ring 12 is eccentrically arranged, if the positioning is not accurate, the true matching can not be realized, and if the original gear ring 12 of the imported eccentric sleeve is not used for the gear ring 12, even if the machining is accurate, the butt joint error still exists, and the actual use is influenced;
s32, the assembled special die 1 and the domestic eccentric sleeve workpiece are integrally clamped on a machine tool for processing, and the positions of the joint of the gear ring 12 and the eccentric butt joint inner ring 25 are butted and completely matched with the imported eccentric sleeve, so that the processed domestic eccentric sleeve workpiece and the imported eccentric sleeve equipment can be guaranteed to be uniform in precision and have interchangeability.
The structure of the special mold 1 in this embodiment is shown in fig. 3, and includes a bottom plate 11, a gear ring 12, a positioning inner ring 13, and a gland 14, where the bottom plate 11 is set to be cylindrical, a pouring hole is formed in the center of the bottom plate 11, the gear ring 12 is fixed on a side surface of the bottom plate 11, a center hole with the same size as the pouring hole in the center of the bottom plate 11 is formed in the center of the gear ring 12, the center hole of the gear ring 12 and the pouring hole of the bottom plate 11 are coaxially arranged, the positioning inner ring 13 is tightly attached to the inner side of the center hole of the gear ring 12 by a pouring method, a certain eccentric distance is maintained between the positioning inner ring 13 and the center hole of the gear ring 12, the gland 14 is attached to the outer side of the gear ring 12, six assembling grooves 15 distributed in a circumferential array with the center of the pouring hole of the bottom plate 11 as a circle center are, the fine setting of the installation of bottom plate 11 and lathe and position of being convenient for is equipped with a plurality of screws on the 12 terminal surfaces of ring gear, be provided with a plurality of and 12 terminal surfaces of ring gear screw assorted screws on the gland 14, pass through screwed connection after the screw on ring gear 12 and the gland 14 aligns, the installation and the separation of gland 14 and ring gear 12 of being convenient for, pass through the screw fixation between ring gear 12 and the bottom plate 11.
The copying processing method for the complex shape and position of the inlet eccentric shaft has novel conception and ingenious design, fully utilizes the structural characteristic of the inlet eccentric sleeve, and utilizes the characteristic that the front end part 21 is butted with the middle section opening part 23 through the double gear rings 22, so that the middle section opening part 23 can be separated from the front end part 21 actually. The copying and processing method for the complex shape and position of the imported eccentric shaft utilizes the characteristic to design a special processing die 1, and utilizes a gear ring 12 which is originally installed in the imported eccentric sleeve as a butt joint piece when the domestic eccentric sleeve is processed, thereby reducing the error during butt joint in the processing process to the maximum extent. Then, by adopting an epoxy resin pouring mode, the epoxy resin positioning inner ring 13 for processing the eccentric butt joint inner ring 25 in the eccentric sleeve can be accurately manufactured, the outer shell central line 100, the inner tooth central line 200 and the eccentric butt joint inner ring central line 300 which are completely consistent with those in the inlet eccentric shaft can be accurately copied, the concentricity of the replaced part and the original part of the inlet eccentric sleeve is consistent, the domestic eccentric sleeve equipment and the inlet eccentric sleeve equipment are uniform in precision, and interchangeability is achieved. In the actual course of working, only need the internal tooth portion meshing of certain part in the eccentric cover that needs processed on special mould 1's ring gear 12, and process whole clamping on the lathe through bottom plate 11, can be used for independently processing middle section trompil portion 23 or preceding tip 21 of import eccentric cover, need not the whole processing after the equipment, reduce the degree of difficulty of whole processing, can realize the change replacement of import eccentric cover subassembly after processing out the part of high accuracy, satisfy the demand of imported product localization, greatly reduced imported part's expense.
The above description is only for the preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, and therefore, all equivalent or modifications that do not depart from the spirit of the present invention are intended to fall within the scope of the present invention.

Claims (8)

1. A replication processing method for complex shapes and positions of an inlet eccentric shaft is characterized by comprising the following steps:
s1, manufacturing a special die,
s11, selecting die steel as a die bottom plate material, carrying out shape rough machining and then carrying out quenching and tempering treatment, carrying out ultra-precision flat grinding on two end surfaces of the bottom plate after quenching and tempering, and transferring the bottom plate to a CNC machining center for machining a central pouring hole, an assembling hole and a fabrication hole after the ultra-precision flat grinding;
s12, performing half-cutting on the double gear rings of the inlet eccentric sleeves, and performing ultra-high precision flat grinding on end faces to enable the two end faces of the gear rings to be parallel;
s13, mounting the gear ring on the bottom plate, ensuring the center line of the gear ring to be superposed with the center line of the bottom plate, and keeping the concentricity of the gear ring and the bottom plate consistent;
s14, processing a gland matched with the outer side face of the gear ring through a CNC (computer numerical control) processing center, wherein an inward bulge is arranged at the joint of the inner side of the gland and the central hole of the gear ring, the inward bulge is eccentric, and an annular cavity formed between the inward bulge of the gland and the central hole of the gear ring forms an epoxy resin pouring groove;
s2, positioning the pouring of the inner ring,
s21, adding the epoxy resin, the filler and the anhydride curing agent into a reaction kettle, stirring, vacuumizing and heating the reaction kettle, and stirring uniformly to obtain an epoxy resin castable;
s22, preheating the special mold prepared in the step S1, then placing the special mold into a vacuum casting tank, wherein the temperature of the special mold is slightly higher than that of the casting material, and after the vacuum casting tank is vacuumized, casting the epoxy resin casting material prepared in the step S21 into an epoxy resin casting groove of the special mold; after the pouring is finished, continuously vacuumizing, then closing the vacuum, opening the vacuum pouring tank, and conveying the special mold into a curing furnace for curing;
s23, solidifying the poured special mold by using a curing furnace, taking out the special mold, cooling the special mold at room temperature, and separating the gland from the gear ring to form an epoxy resin positioning inner ring in the inner side of the gear ring in a pouring manner;
s3, copying and processing the eccentric shaft,
s31, meshing a domestic eccentric sleeve workpiece needing to be processed on the gear ring through the internal tooth part, and enabling the inner side of the domestic eccentric sleeve needing to be processed to be attached to the epoxy resin positioning inner ring in the gear ring;
s32, integrally clamping the assembled special die and the domestic eccentric sleeve workpiece on a machine tool for processing, and ensuring that the processed domestic eccentric sleeve workpiece and the imported eccentric sleeve equipment have uniform precision and interchangeability.
2. The method for duplicating complex shape and position of the inlet eccentric shaft as described in claim 1, wherein: in the step S21, adding liquid epoxy resin and a filler into a reaction kettle according to a mass ratio of 1:1, stirring for 5-10 minutes, so that the liquid epoxy resin and the filler are uniformly mixed, then adding an anhydride curing agent with a mass of 10% of the mass of the epoxy resin, vacuumizing the reaction kettle, keeping a vacuum degree of 0.05-0.1MPa, heating to a temperature of 80-100 ℃, and stirring for 30-60 minutes, thereby obtaining the epoxy resin castable, wherein the liquid epoxy resin is bisphenol a type epoxy resin, the anhydride curing agent is methyl tetrahydrophthalic anhydride, and the filler is asbestos fiber: quartz powder: the aluminum oxide is mixed according to the mass ratio of 5:4: 1.
3. The method for duplicating complex shape and position of the inlet eccentric shaft according to claim 1 or 2, wherein: in the step S22, the special mold is preheated to 80-100 ℃ and then placed into a vacuum casting tank, the temperature of the special mold is slightly higher than the temperature of the casting material, the vacuum degree of the vacuum casting tank is reduced to below 1330Pa, the temperature of 80-100 ℃ is maintained, and then the epoxy resin casting material prepared in the step S21 is poured into an epoxy resin casting groove of the special mold; and after the pouring is finished, continuously vacuumizing for 5-10 minutes to remove bubbles formed in the pouring piece, closing the vacuum, opening the vacuum pouring tank, and conveying the special mold into a curing furnace for curing.
4. The method for duplicating complex shape and position of the inlet eccentric shaft as claimed in claim 3, wherein: in the step S23, the material is cured for 10-30 minutes at a temperature of 100-110 ℃ by using a curing oven.
5. The method for duplicating complex shape and position of the inlet eccentric shaft as described in claim 1, wherein: the end edge of the special mold bottom plate is uniformly provided with a plurality of assembling grooves which are distributed in a circumferential array by taking the center of the bottom plate pouring hole as the circle center.
6. The method for duplicating complex shape and position of the inlet eccentric shaft as described in claim 1, wherein: the bottom plate is also provided with a plurality of assembly long holes for being fixedly installed with external equipment.
7. The method for duplicating complex shape and position of the inlet eccentric shaft as described in claim 1, wherein: the gear ring end face is provided with a plurality of screw holes, the gland is provided with a plurality of screw holes matched with the screw holes on the gear ring end face, and the gear ring is connected with the screw holes on the gland through screws after being aligned.
8. The method for duplicating complex shape and position of the inlet eccentric shaft as described in claim 1, wherein: and the gear ring and the bottom plate are fixed through screws.
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