Machining method of shaftless rotor cast aluminum mold

Abstract

The invention discloses a method for processing a shaftless rotor cast aluminum die, which comprises the processing of a lower die, a pressing plate and an upper die of a shaftless rotor die, and comprises the following steps of: firstly, putting forward a concept of integrally manufacturing the lower die, the pressing plate and the upper die, and coaxially processing the excircle sizes of the lower die, the pressing plate and the upper die on a bar to ensure that the axes of the lower die, the pressing plate and the upper die are consistent; then, locating points suitable for the three parts are found, namely, the center of a lower die plug hole is used for locating, pre-plug holes are formed in a lower die, a pressing plate and an upper die in a penetrating mode, corresponding cavities are formed according to the positions of the pre-plug holes, in this way, it is ensured that after the three parts are installed, the concentricity of the cavities is matched, and therefore the product percent of pass of the shaftless rotor is increased; integrated machining procedures can be added to the front end of an existing production line of the lower die, the pressing plate and the upper die, an enterprise can conduct operation depending on conventional production equipment, the production line transformation cost is low, operation is easy, and practicability is high.

Description

Technical Field

[0001] The invention belongs to the field of mold manufacturing, and in particular relates to a processing method of a shaftless rotor aluminum casting mold. Background Art

[0002] The shaftless rotor is a component of most small and medium-sized three-phase asynchronous motors. It is mainly formed by rotor punching and aluminum through a pressure casting aluminum machine. The formation of the shaftless rotor depends on the aluminum casting mold. The commonly used pressure casting aluminum mold is mainly composed of an upper mold pad, an upper mold, a middle mold, a dummy shaft, a lower mold, a lower mold plug and a pressure plate, such as Figure 1 Therefore, the quality of the aluminum casting mold is directly related to the quality of the shaftless rotor. At present, the aluminum casting mold parts are made separately, and the installation is often not in place, which reduces the product qualification rate of the shaftless rotor. Regarding the existing research on cast aluminum molds, we found application number 201410530732.1, invention name: A method for processing a rotor die-cast aluminum mold, the process is a) rough turning H13 steel according to the mold drawing, leaving a 0.4mm radial margin and a 0.3mm axial margin, and then processing threaded holes and locating pin holes according to the requirements of the drawing; b) stress relief treatment of the rough-processed mold, keeping it at 520-540℃ for 3-4 hours; c) quenching the stress-relieved mold, first at 650℃ for 1.5 hours, 850℃ for 1.5 hours, then heating to 1020℃ for 2.5 hours, and then air cooling for 1 hour; d) tempering the quenched mold, the tempering temperature is 580℃; e) finish machining the heat-treated mold, and then mirror polishing the cavity. The invention can ensure the surface quality of subsequent processing and save tool investment; it can ensure that there will be no large deformation during the subsequent quenching treatment; it can reduce the hardness of the mold, improve the toughness of the mold and prevent the mold life from being reduced due to excessive hardness; it can effectively improve the surface quality of the product and reduce the possibility of mold sticking; it can improve the wear resistance of the mold surface and further increase the mold life. The invention does not propose a solution to the problem of improper installation of cast aluminum mold parts. Summary of the invention

[0003] The purpose of the present invention is to solve the above technical problems and provide a processing method for a shaftless rotor cast aluminum mold which is simple to operate and highly practical. The method of the present invention can ensure that the axes of the lower mold, the pressure plate and the upper mold are consistent, and at the same time can ensure that the concentricity of the cavity after the three parts are installed is matched, thereby improving the product qualification rate of the shaftless rotor.

[0004] To achieve the above-mentioned purpose, the technical solution of the present invention is:

[0005] A method for processing a shaftless rotor aluminum casting mold includes processing a lower mold, a pressing plate and an upper mold of the shaftless rotor mold, and the steps are as follows:

[0006] (1) Cutting: the blank is a cylindrical bar;

[0007] (2) The outer circle of the bar is turned with the diameter of the pressure plate as the radial dimension, and a radial machining allowance of 5 mm is reserved on the bar; the sum of the thickness of the lower die, the pressure plate and the upper die is the thickness dimension of the bar, and the bar is cut in a direction perpendicular to the axis, and a thickness machining allowance of 5 mm is reserved to initially obtain the workpiece, and the two circular end faces of the workpiece are polished and smooth;

[0008] (3) Using a circular end face of the workpiece as a reference surface, and using the diameters of the small chassis and the large chassis of the lower die as radial dimensions, the outer circle of the workpiece is turned respectively; the thickness of the small chassis and the large chassis are used to control the cutting distance of the turning tool in the thickness direction, and then the outer shape structure of the lower die is obtained on this end of the workpiece;

[0009] (4) Using the other circular end face of the workpiece as a reference surface, turning the outer circle of the workpiece with the diameter of the upper die as the radial dimension, and controlling the cutting distance of the turning tool in the thickness direction with the thickness of the upper die, and then obtaining the outer shape structure of the upper die on this end of the workpiece; after this step, a workpiece is finally formed with the lower die, the pressure plate and the upper die coaxially combined;

[0010] (5) According to the design requirements of the aluminum casting mold drawing, find the center point of the lower mold plug hole on the lower mold end surface of the workpiece obtained in step (4) and mark it, and then punch it;

[0011] (6) Clamping the workpiece punched in step (5) on a four-jaw chuck, and turning a pre-plug hole smaller than the plug hole diameter of the lower die at the punching position, wherein the pre-plug hole penetrates two end faces of the workpiece;

[0012] (7) using a wire cutting device to cut the workpiece obtained in step (6) into three parts in a direction perpendicular to the axis of the workpiece, respectively obtaining a lower mold preparatory part, a pressure plate preparatory part, and an upper mold preparatory part;

[0013] (8) A four-jaw chuck is used to clamp the lower die preparation part, the pressure plate preparation part, and the upper die preparation part, respectively, and the lower die, pressure plate, and upper die preparation parts are processed according to the design requirements of the drawings of the lower die, pressure plate, and upper die, so as to finally obtain a lower die, pressure plate, and upper die with consistent size and concentricity.

[0014] As a further technical solution, in the above step (7), the cutting positions of the workpiece include:

[0015] a. Take the end face of the workpiece close to the lower die as the reference plane and the thickness of the lower die as the cutting distance;

[0016] b. Take the end face of the workpiece close to the upper die as the reference plane and the thickness of the upper die as the cutting distance.

[0017] As a further technical solution, the processing method of the lower mold in the above step (8) is as follows: clamp the lower mold preparation part on a lathe with a four-jaw chuck, use the outer circle of the small chassis as the clamping point, use a dial indicator to measure the runout of the diameter of the first pre-plugged hole of the lower mold preparation part, until the runout of the diameter of the first pre-plugged hole is zero, lock the four-jaw chuck, and according to the design requirements of the lower mold drawing, process the first cavity with the axis of the first pre-plugged hole as the center. After the first cavity is processed, release the four-jaw chuck; rotate the lower mold preparation part, use a dial indicator to measure the runout of the diameter of the second pre-plugged hole, until the runout of the diameter of the second pre-plugged hole is zero, lock the four-jaw chuck, process the second cavity, and so on, until all the lower mold cavities are processed, remove the lower mold preparation part, place it on the drilling machine, and drill all the balancing holes in each cavity in turn to obtain the lower mold finished product.

[0018] As a further technical solution, the processing method of the pressing plate in the above step (8) is:

[0019] a. Clamp the preparatory platen on the lathe with four-jaw chuck, take the outer circle of the preparatory platen as the clamping point, use a dial indicator to measure the runout of the diameter of the preparatory platen, and lock the four-jaw chuck until the runout is zero, and turn out the limit opening. The diameter and depth of the limit opening are in accordance with the regulations of the standard platen parts;

[0020] b. Loosen the chuck and use a dial indicator to measure the runout of the diameter of the first pre-plugged hole on the pressure plate preparation until the runout of the diameter of the first pre-plugged hole is zero, lock the four-jaw chuck, and according to the design requirements of the pressure plate drawing, process the first cavity with the axis of the first pre-plugged hole on the pressure plate preparation as the center. After the first cavity is processed, loosen the four-jaw chuck, rotate the pressure plate preparation, and use a dial indicator to measure the runout of the diameter of the second pre-plugged hole until the runout of the diameter of the second pre-plugged hole is zero, lock the four-jaw chuck, and process the second cavity with the axis of the second pre-plugged hole as the center, and so on, until all the pressure plate cavities are processed, and the finished pressure plate is obtained.

[0021] As a further technical solution, the processing method of the upper mold in the above step (8) is: clamp the upper mold preparation part on a lathe with a four-jaw chuck, use the outer circle of the upper mold preparation part as the clamping point, use a dial indicator to measure the diameter jump of the first pre-plugged hole of the upper mold preparation part, until the diameter jump of the first pre-plugged hole is zero, lock the four-jaw chuck, and according to the design requirements of the upper mold drawing, use the first pre-plugged hole axis on the upper mold preparation part as the center to process the first cavity. After the first cavity is processed, release the four-jaw chuck, rotate the upper mold preparation part, and use a dial indicator to measure the diameter jump of the second pre-plugged hole until the diameter jump of the second pre-plugged hole is zero, lock the four-jaw chuck, and process the second cavity, and so on, until all the upper mold cavities are processed, that is, the pressure plate is obtained. The finished product is placed on the drilling machine, and all the balancing holes and threaded holes are drilled in sequence.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. By Figure 1 It can be seen that the cavities on the upper die, lower die and pressure plate in the cast aluminum mold are distributed in a ring shape, which requires that the concentricity of each cavity be ensured to be consistent during the assembly process, which places extremely high demands on the production of parts of the upper die, lower die and pressure plate. Currently, most companies use methods such as marking and proofing to process the lower die, pressure plate and upper die respectively. This method cannot truly ensure that the axes of the three are consistent, which may cause concentricity deviations in their cavities, thereby affecting the installation and fit of the lower die, pressure plate and upper die, resulting in an unqualified shaftless rotor processed in a certain cavity, reducing the qualified rate of the product. The present invention firstly proposes the concept of integral manufacturing of the lower die, the pressure plate and the upper die, and coaxially processes the outer circle dimensions of the lower die, the pressure plate and the upper die on a bar material to ensure that the axes of the lower die, the pressure plate and the upper die are consistent; then, the present invention finds a positioning point applicable to all three parts, that is, the center of the plug hole of the lower die is used as the positioning point, and pre-plug holes are penetrated through the lower die, the pressure plate and the upper die, and corresponding cavities are opened according to the positions of the pre-plug holes, thereby ensuring the matching of the concentricity of the cavities after the three parts are installed, thereby improving the product qualification rate of the shaftless rotor.

[0024] 2. The present invention can add an integrated processing procedure to the front end of the existing production line of the lower mold, the pressure plate, and the upper mold. The enterprise can rely on conventional production equipment for operation. The production line transformation cost is low, the operation is simple, and the practicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of a shaftless rotor aluminum casting mold;

[0026] Figure 2 Schematic diagram of the structure of the support plate; (a) front view, (b) cross-sectional view;

[0027] Figure 3 Schematic diagram of the structure of the lower mold; (a) front view, (b) cross-sectional view;

[0028] Figure 4 Schematic diagram of the structure of the middle mold; (a) front view, (b) cross-sectional view;

[0029] Figure 5 Schematic diagram of the structure of the pressure plate; (a) front view, (b) cross-sectional view;

[0030] Figure 6 Schematic diagram of the structure of the upper mold; (a) front view, (b) cross-sectional view;

[0031] Figure 7 Schematic diagram of the structure of the upper pad; (a) front view, (b) cross-sectional view;

[0032] Figure 8Schematic diagram of the structure of the lower mold plug; (a) front view, (b) top view;

[0033] Fig. 9 Schematic diagram of the structure of the pseudo-axis; (a) front view, (b) top view;

[0034] Fig.10 Schematic diagram of the structure of the rotor punching; (a) front view, (b) cross-sectional view;

[0035] Fig.11 Schematic diagram of the structure of the workpiece obtained after step (2) of Example 1 of the present invention; (a) front view, (b) bottom view;

[0036] Fig.12 Schematic diagram of the structure of the workpiece obtained after step (4) of Example 1 of the present invention; (a) front view, (b) bottom view;

[0037] Fig.13 Schematic diagram of the structure of the workpiece obtained after step (6) of Example 1 of the present invention; (a) front view, (b) cross-sectional view;

[0038] Fig.14 Schematic diagram of the structure of the lower mold preparation part after step (7) of Example 1 of the present invention; (a) front view, (b) cross-sectional view;

[0039] Fig.15 Schematic diagram of the structure of the preparatory part of the pressure plate after step (7) of Example 1 of the present invention; (a) front view, (b) cross-sectional view;

[0040] Fig.16 Schematic diagram of the structure of the upper mold preparation part after step (7) of Example 1 of the present invention; (a) front view, (b) cross-sectional view;

[0041] Fig.17 Schematic diagram of the structure of the finished lower mold product after step (8) of Example 1 of the present invention; (a) front view, (b) cross-sectional view;

[0042] Fig.18 Schematic diagram of the structure of the finished pressing plate after step (8) of Example 1 of the present invention; (a) front view, (b) cross-sectional view;

[0043] Fig.19 Schematic diagram of the structure of the finished upper mold product after step (8) of Example 1 of the present invention; (a) front view, (b) cross-sectional view.

[0044] Reference numerals:

[0045] 1-die casting machine die base, 2-bolts, 3-nuts, 4-die casting machine block, 5-pressure plate, 6-support plate, 7-die casting machine fixed die base, 8-aluminum liquid, 9-lower die plug, 10-plug hole, 11-lower die, 1101-large chassis, 1102-small chassis, 12-rotor punching sheet, 13-dummy shaft, 14-middle die, 15-upper die, 16-upper pad, 17-processing parts, 18-lower die preparation parts, 1801-lower model cavity, 1802-lower die balance hole, 19-pressure plate preparation parts, 1901-limit opening, 1902-pressure plate cavity, 20-upper die preparation parts, 2001-upper model cavity, 2002-upper die balance hole, 2003-threaded hole, 21-pre-plug hole.

[0046] Lower die: D1-lower die large base diameter, D2-lower die small base diameter, D3-plug hole diameter, D4-axis distance between two lower mold cavities passing through the lower die axis in the same plane, D10-lower die balance hole diameter, L1-total lower die thickness, L2-small base thickness;

[0047] Press plate: D5-press plate diameter, D6-axis distance between two press plate cavities passing through the axis of the press plate in the same plane, D13-limit opening diameter, L3-press plate thickness;

[0048] Upper die: D7-upper die diameter, D8-axis distance between two upper die cavities passing through the upper die axis in the same plane, D11-upper die balance hole diameter, D12-thread hole diameter, L4-upper die thickness;

[0049] D9-Pre-plug hole diameter. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below in conjunction with examples, but the implementation mode of the present invention is not limited to the scope represented by the examples.

[0051] Embodiment 1:

[0052] like Figure 1 It is a commonly used pressure casting aluminum mold, including a die casting machine die base 1, a die casting machine block 4, a pressure plate 5, a support plate 6, a die casting machine fixed die base 7, a lower die plug 9, a lower die 11, a rotor punch 12, a dummy shaft 13, a middle die 14, an upper die 15, an upper pad 16 and other assembly parts.

[0053] like Figure 2 The support plate 6 shown has a circular hole in the middle thereof for placing the lower mold 11;

[0054] like Figure 3The lower mold 11 shown is composed of two coaxial cylindrical large chassis 1101 and small chassis 1102, which are assembled from top to bottom. The small chassis 1102 is matched and arranged in the circular hole in the middle of the support plate 6, and the large chassis 1101 is mounted on the edge of the circular hole of the support plate 6 to form a stable support; four lower model cavities 1801 are opened on the large chassis 1101 and penetrate to the small chassis 1102, and the four lower model cavities 1801 are distributed in a ring shape with the axis of the lower mold 11 as the center; a plug hole 10 is set at the lower center of each lower model cavity 1801, and a plug hole 10 is installed in the plug hole 10 Figure 8 A lower mold plug 9 is provided in the lower mold cavity 1801; a lower mold balancing hole 1802 is also provided;

[0055] like Figure 4 The middle mold 14 shown has its lower portion installed in the lower mold cavity 1801 .

[0056] like Fig. 9 and Fig.10 As shown, the rotor punching sheet 12 is passed through the dummy shaft 13 to form a rotor core with the dummy shaft 13, and four rotor cores with the dummy shaft 13 are placed in the middle mold 14;

[0057] like Figure 5 The pressing plate 5 shown in the figure mainly passes through the upper part of the middle mold 14 to firmly press the outer edge of the middle mold 14. Therefore, four holes are opened on the pressing plate 5 for the middle mold 14 to pass through and press the middle mold 14. The shape of the hole is structurally described by the limit opening 1901 and the pressing plate cavity 1902 in the present invention, which also belongs to the conventional structural design in this field. An L-shaped die-casting machine stopper 4 is provided on the periphery of the pressing plate 5 to prevent the pressing plate 5 from shifting. The die-casting machine stopper 4 is fixed on the fixed die seat 7 of the die-casting machine.

[0058] like Figure 6 The upper mold 15 shown is installed on the upper part of the middle mold 14, so four upper mold cavities 2001 corresponding to the positions of the lower mold cavities 1801 are opened on the upper mold 15, and the shapes of the upper mold cavities 2001 correspond to the shapes of the combined middle mold 14 and the dummy shaft 13, which is a conventional setting in this field; the upper mold balancing hole 2002 is also correspondingly arranged in the upper mold cavity 2001; and the upper mold 15 is also provided with a threaded hole 2003 in an annular shape for connecting with the upper pad 16.

[0059] like Figure 7 The upper pad 16 shown is installed above the upper die 15. The upper die 15 and the upper pad 16 are installed in the die base 1 of the die casting machine with T-bolts 2.

[0060] During casting, pour the high-temperature aluminum liquid 8 into the melting cup of the die-casting machine fixed die seat 7, press the push button, move the assembled mold to the position of the melting cup of the die-casting machine fixed die seat 7. Press the shot button, and the die-casting is completed.

[0061] From the perspective of the assembly structure, the concentricity of the cavities of the upper mold 15, the lower mold 11 and the pressure plate 5 must be consistent in order to produce qualified products. That is, in the same plane, the axial spacing D4 of the two lower model cavities 1801 passing through the axis of the lower mold 11, the axial spacing D6 of the two pressure plate cavities 1902 passing through the axis of the pressure plate 5, and the axial spacing D8 of the two upper model cavities 2001 passing through the axis of the upper mold 15 are the same to ensure concentricity. Based on this theory, the present invention proposes a processing method for a shaftless rotor cast aluminum mold, including the processing of the lower mold 11, the pressure plate 5 and the upper mold 15 of the shaftless rotor mold. Before processing, the dimensions of the corresponding parts are designed, as shown in Table 1:

[0062] Table 1

[0063]

[0064] According to the dimensions in Table 1, the processing steps are as follows:

[0065] (1) Cutting: the blank is a cylindrical bar;

[0066] (2) Fig.11 As shown, the outer circle of the bar is turned with the diameter of the pressing plate 5 of 420 mm as the radial dimension, and a radial machining allowance of 5 mm is reserved on the bar; the thickness dimension of the bar is 48 mm, which is the sum of the thicknesses of the lower die 11, the pressing plate 5 and the upper die 15, and the bar is cut in a direction perpendicular to the axis, and a thickness machining allowance of 5 mm is reserved; a workpiece 17 is initially obtained, and the two circular end faces of the workpiece 17 are polished and smoothed;

[0067] (3) Fig.12 As shown, a circular end face of the workpiece 17 is used as a reference plane, and the diameters of 280 mm and 320 mm of the small chassis 1102 and the large chassis 1101 of the lower die 11 are used as radial dimensions to sequentially turn the outer circle of the workpiece 17; the thicknesses of the small chassis 1102 and the large chassis 1101, i.e., 5 mm and 10 mm, are used to control the lateral cutting distance of the turning tool, respectively, and then the outer shape structure of the lower die 11 is obtained on this end of the workpiece; the turning process is parameterized and operated according to the existing lathe, and the lower die size specified in this embodiment can be finally produced.

[0068] (4) Fig.12 As shown, the other circular end face of the workpiece 17 is used as the reference surface, and the outer circle of the workpiece 17 is turned with the diameter of the upper die 15 of 320 mm as the radial dimension; the thickness of the upper die 15 is 15 mm to control the cutting distance in the thickness direction of the turning tool, and then the outer shape structure of the upper die 15 is obtained on this end of the workpiece 17; after this step, the workpiece 17 composed of the lower die 11, the pressure plate 5 and the upper die 15 coaxially is finally formed;

[0069] (5) According to the design requirements of the aluminum casting mold drawing as shown in Table 1, it is known that the axial center spacing of the four lower mold cavities passing through the axis of the lower mold is 170 mm. The end face of the lower mold small chassis 1102 of the workpiece obtained in step (4) is marked, and the center point position of the lower mold plug hole 10 is found and marked on the end face of the small chassis 1102 (at the same time, the axial center position of the cavity of the pressure plate 5 and the upper mold 15 is also found), and then the proof is punched; there are many methods for determining the marking position in this field. In this embodiment, a dividing chuck is used to assist in marking. The marking steps are as follows: the workpiece 17 obtained in step (4) is installed on the dividing chuck, and the maximum size of the workpiece 17 installed on the dividing chuck is measured with a height gauge. According to the maximum diameter of the workpiece 17, the center size of the workpiece 17 is calculated, and the height gauge is used to determine the center point of the workpiece 17. Adjust the ruler to the center size of the workpiece 17, draw a horizontal line with the height ruler, rotate the indexing chuck 90 degrees, and draw a horizontal line again. The intersection of the two straight lines is the midpoint of the workpiece 17. According to the drawing size of the pre-plug hole 21 of the lower die in the drawing, calculate the height, adjust the height ruler to the height ruler size of the pre-plug hole 21, and use the height ruler to draw lines, draw the upper and lower horizontal lines in sequence, and intersect with the previously drawn lines. The intersection point is the position of the future proofing punch; rotate the indexing chuck 90 degrees again, calculate the height according to the drawing size of the pre-plug hole 21 of the lower die in the drawing, adjust the height ruler to the height ruler size of the pre-plug hole 21, and use the height ruler to draw lines, draw the upper and lower horizontal lines in sequence, and intersect with the previously drawn lines. The intersection point is the position of the future proofing punch; in this way, 4 intersection points are formed. This step is a conventional marking step. If there are places that are not fully explained, please understand them according to the conventional method.

[0070] (6) Fig.13 As shown, the workpiece 17 punched in step (5) is clamped on a four-jaw chuck, and a pre-plug hole 21 with a diameter of 14 mm is machined at the punching position, and the pre-plug hole 21 penetrates the two end faces of the workpiece;

[0071] (7) Using a wire cutting device, the workpiece obtained in step (6) is cut into three parts in a direction perpendicular to the axis of the workpiece 17, respectively obtaining a lower mold preparatory part 18, a pressure plate preparatory part 19 and an upper mold preparatory part 20, as shown in FIG. Figure 14-16 As shown; the cutting positions of the workpiece include:

[0072] a. Take the end surface of the workpiece 17 close to the lower die 11 as the reference plane, and the total thickness of the lower die 15mm as the cutting distance;

[0073] b. Take the end surface of the workpiece 17 close to the upper die 15 as the reference plane, and the thickness of the upper die 15mm as the cutting distance.

[0074] (8) The lower mold preparatory part 18, the pressure plate preparatory part 19 and the upper mold preparatory part 20 are clamped by a four-jaw chuck respectively, and processed according to the design requirements of the lower mold 11, the pressure plate 5 and the upper mold 15 (as shown in Table 1), and finally the lower mold 11, the pressure plate 5 and the upper mold 15 with consistent size and concentricity are obtained.

[0075] like Fig.17 As shown, the processing method of the lower mold 11 is: clamp the lower mold preparation part 18 on the lathe with a four-jaw chuck, take the outer circle of the small chassis 1102 as the clamping point, use a dial indicator to measure the diameter runout of the first pre-plugged hole 21 of the lower mold preparation part 18, until the diameter runout of the first pre-plugged hole 21 is zero, lock the four-jaw chuck, and according to the design requirements of the lower mold 11 drawing, process the first cavity with the axis of the first pre-plugged hole 21 as the center. After the first cavity is processed, release the four-jaw chuck; rotate the lower mold preparation part 18, measure the diameter runout of the second pre-plugged hole 21 with a dial indicator, until the diameter runout of the second pre-plugged hole 21 is zero, lock the four-jaw chuck, process the second cavity, and so on, until all the lower model cavities 1801 are processed, remove the lower mold preparation part 18, put it on the drilling machine, and drill all the balancing holes in each cavity in turn to obtain the finished lower mold 11.

[0076] like Fig.18 As shown, the processing method of the pressing plate 5 is:

[0077] a. Clamp the pressure plate preparation part 19 on the lathe with a four-jaw chuck, use the outer circle of the pressure plate preparation part 19 as the clamping point, use a dial indicator to measure the runout of the diameter of the pressure plate preparation part 19, lock the four-jaw chuck until the runout is zero, and turn out the limit opening 1901. The diameter and depth of the limit opening 1901 are in accordance with the regulations of the standard part of the pressure plate 5;

[0078] b. Loosen the chuck and use a dial indicator to measure the diameter runout of the first pre-plugged hole 21 of the pressure plate preparation part 19 until the diameter runout of the first pre-plugged hole 21 is zero, lock the four-jaw chuck, and according to the design requirements of the pressure plate 5 drawing, process the first cavity with the axis of the first pre-plugged hole 21 on the pressure plate preparation part 19 as the center. After the first cavity is processed, loosen the four-jaw chuck, rotate the pressure plate preparation part 19, and use a dial indicator to measure the diameter runout of the second pre-plugged hole 21 until the diameter runout of the second pre-plugged hole 21 is zero, lock the four-jaw chuck, and process the second cavity with the axis of the second pre-plugged hole 21 as the center, and so on, until all the pressure plate cavities 1902 are processed, and the finished pressure plate 5 is obtained.

[0079] like Fig.19As shown, the processing method of the upper mold 15 is: clamp the upper mold preparation part 20 on a lathe with a four-jaw chuck, use the outer circle of the upper mold preparation part 20 as the clamping point, use a dial indicator to measure the diameter runout of the first pre-plugged hole 21 of the upper mold preparation part 20, until the diameter runout of the first pre-plugged hole 21 is zero, lock the four-jaw chuck, and according to the design requirements of the upper mold 15 drawing, use the axis of the first pre-plugged hole 21 on the upper mold preparation part 20 as the center to process the first cavity, after the first cavity is processed, release the four-jaw chuck, rotate the upper mold preparation part 20, measure the diameter runout of the second pre-plugged hole 21 with a dial indicator, until the diameter runout of the second pre-plugged hole 21 is zero, lock the four-jaw chuck, process the second cavity, and so on, until all the upper model cavities 2001 are processed, that is, the pressure plate 5 is finished, and placed on the drilling machine, and all the balancing holes and threaded holes 2003 are drilled in sequence.

[0080] The above-mentioned cavity size is processed according to the requirements of the actual processing plant, and the operation steps are conventional operations, which are not within the protection scope of the present invention and are therefore not described in detail.

[0081] The cavity concentricity of the lower die 11, the pressing plate 5 and the upper die 15 obtained by the processing method of the present invention is consistent, thereby improving the product qualification rate of the shaftless rotor.

[0082] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "head", "tail", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. It should also be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection; it can be a detachable connection; it can also be a point connection; it can be a direct connection; it can be an indirect connection through an intermediate medium, so that the internals of the two elements can be connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The device connection methods not fully described in the present invention are all understood as conventional connection methods in the field.

[0083] The above embodiments are only specific examples for further describing the purpose, technical solutions and beneficial effects of the present invention, and the present invention is not limited thereto. Any modification, equivalent replacement, improvement, etc. made within the scope disclosed by the present invention are included in the protection scope of the present invention.

Claims

1. A method for processing a shaftless rotor aluminum casting mold, characterized in that: Including the processing of the lower mold, pressure plate and upper mold of the shaftless rotor mold, the steps are as follows: (1) Cutting: the blank is a cylindrical bar; (2) Turn the outer circle of the bar material with the pressure plate diameter as the radial dimension, and keep a radial machining allowance of 5 mm on the bar material; take the sum of the thickness of the lower die, pressure plate and upper die as the thickness dimension of the bar material, cut the bar material in a direction perpendicular to the axis, and keep a thickness machining allowance of 5 mm to obtain a preliminary workpiece, and grind the two circular end faces of the workpiece flat; (3) Using a circular end face of the workpiece as a reference surface, and using the diameters of the small chassis and the large chassis of the lower die as radial dimensions, the outer circle of the workpiece is turned respectively; the thickness of the small chassis and the large chassis are used to control the cutting distance in the thickness direction of the turning tool, and then the outer shape structure of the lower die is obtained on this end of the workpiece; (4) Using the other circular end face of the workpiece as the reference surface, the outer circle of the workpiece is turned using the diameter of the upper die as the radial dimension, and the cutting distance in the thickness direction of the turning tool is controlled by the thickness of the upper die, and then the outer shape structure of the upper die is obtained on this end of the workpiece; after this step, a workpiece is finally formed with the lower die, the pressure plate and the upper die coaxially combined; (5) According to the design requirements of the aluminum casting mold drawing, find the center point of the lower mold plug hole on the lower mold end surface of the workpiece obtained in step (4) and mark it, and then punch it; (6) Clamping the workpiece punched in step (5) on a four-jaw chuck, and turning a pre-plug hole smaller than the plug hole diameter of the lower die at the punching position, wherein the pre-plug hole penetrates two end faces of the workpiece; (7) Using a wire cutting device, in a direction perpendicular to the axis of the workpiece, the workpiece obtained in step (6) is cut into three parts, namely, a lower die preparation part, a pressure plate preparation part, and an upper die preparation part; (8) The lower die preparation part, the pressure plate preparation part and the upper die preparation part are clamped by a four-jaw chuck respectively, and the lower die, the pressure plate and the upper die are processed according to the design requirements of the drawings, and finally the lower die, the pressure plate and the upper die with consistent size and concentricity are obtained.

2. The method for processing a shaftless rotor aluminum casting mold according to claim 1, characterized in that: In step (7), the cutting positions of the workpiece include: a. Take the end face of the workpiece close to the lower die as the reference plane and the thickness of the lower die as the cutting distance; b. Take the end face of the workpiece close to the upper die as the reference plane and the thickness of the upper die as the cutting distance.

3. The method for processing a shaftless rotor aluminum casting mold according to claim 1, characterized in that: The processing method of the lower mold in step (8) is as follows: clamp the lower mold preparation part on a lathe with a four-jaw chuck, use the outer circle of the small chassis as the clamping point, use a dial indicator to measure the runout of the diameter of the first pre-plugged hole of the lower mold preparation part, until the runout of the diameter of the first pre-plugged hole is zero, lock the four-jaw chuck, and according to the design requirements of the lower mold drawing, process the first cavity with the axis of the first pre-plugged hole as the center. After the first cavity is processed, release the four-jaw chuck; rotate the lower mold preparation part, use a dial indicator to measure the runout of the diameter of the second pre-plugged hole, until the runout of the diameter of the second pre-plugged hole is zero, lock the four-jaw chuck, process the second cavity, and so on, until all the lower mold cavities are processed, remove the lower mold preparation part, put it on the drilling machine, and drill all the balancing holes in each cavity in turn to obtain a lower mold finished product.

4. The method for processing a shaftless rotor aluminum casting mold according to claim 1, characterized in that: The processing method of the pressure plate in step (8) is: a. Clamp the preparatory platen on the lathe with four-jaw chuck, take the outer circle of the preparatory platen as the clamping point, use a dial indicator to measure the runout of the diameter of the preparatory platen, lock the four-jaw chuck until the runout is zero, and turn out the limit opening. The diameter and depth of the limit opening are in accordance with the regulations of the standard platen parts; b. Loosen the chuck and use a dial indicator to measure the runout of the diameter of the first pre-plugged hole on the pressure plate preparation until the runout of the diameter of the first pre-plugged hole is zero, lock the four-jaw chuck, and according to the design requirements of the pressure plate drawing, process the first cavity with the axis of the first pre-plugged hole on the pressure plate preparation as the center. After the first cavity is processed, loosen the four-jaw chuck, rotate the pressure plate preparation, and use a dial indicator to measure the runout of the diameter of the second pre-plugged hole until the runout of the diameter of the second pre-plugged hole is zero, lock the four-jaw chuck, and process the second cavity with the axis of the second pre-plugged hole as the center, and so on, until all the pressure plate cavities are processed, and the finished pressure plate is obtained.

5. The method for processing a shaftless rotor aluminum casting mold according to claim 1, characterized in that: The processing method of the upper mold in step (8) is as follows: clamp the upper mold preparation part on a lathe with a four-jaw chuck, use the outer circle of the upper mold preparation part as the clamping point, use a dial indicator to measure the runout of the diameter of the first pre-plugged hole of the upper mold preparation part, until the runout of the diameter of the first pre-plugged hole is zero, lock the four-jaw chuck, and according to the design requirements of the upper mold drawing, use the axis of the first pre-plugged hole on the upper mold preparation part as the center to process the first cavity. After the first cavity is processed, release the four-jaw chuck, rotate the upper mold preparation part, and use a dial indicator to measure the runout of the diameter of the second pre-plugged hole until the runout of the diameter of the second pre-plugged hole is zero, lock the four-jaw chuck, and process the second cavity, and so on, until all the upper mold cavities are processed, that is, the pressure plate is obtained. The finished product is placed on the drilling machine and all the balancing holes and threaded holes are drilled in sequence.

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