Machining method for double spindles of new energy plug-in hybrid power die-casting aluminum alloy shell

Abstract

The invention discloses a new energy plug-in hybrid power die-casting aluminum alloy shell double-spindle machining method which comprises the following steps: firstly, roughly and finely milling process surfaces and process holes, pre-milling two junction surfaces, removing feed ports and cinder ladles on the junction surfaces, avoiding vibration generated by large-allowance cutting and applying stress to a product, and avoiding the influence of deformation on the planeness of a large surface; and the machining process sequence selects the same sequence for rotary machining, so that the error between rotary tables can be better reduced. A high-power double-main-shaft horizontal machining center is used, equipment is provided with grating ruler compensation functions of all shafts, a machine body temperature detection compensation function and high-torque double main shafts, a guide bar boring cutter is selected for machining, the cylindricity and high-precision aperture of a bearing hole are better guaranteed, the positive and negative coaxiality of a shell is optimized, the Renishaw online detection compensation function is used, and the machining precision is improved. And the coaxiality precision is ensured. The double spindles are adopted for simultaneous machining, the machining efficiency is improved, two products can be produced at a time, the double spindles can be used for split-shaft machining, the machining efficiency is improved, and the product quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of die-cast aluminum alloy machining, and mainly relates to a method for machining double spindles of a die-cast aluminum alloy housing of a new energy plug-in hybrid power vehicle. Background Art

[0002] At present, with the rapid development of new energy vehicles and the diversity of automobile products, automobile drive housings are mainly made of die-cast aluminum alloy. The housing product structure is complex, the product wall is thin, the leakage requirements are high, the product cleanliness requirements are high, the processing accuracy is high, and the production capacity is rapidly increasing. When processing the drive housing, the housing joint surface flatness requirements are high, the flatness requirement is 0.05mm, the bearing hole position requirement is 0.05mm, and the cylindricity requirement is 0.012mm, which causes processing stress deformation and cannot guarantee the relevant dimensions. The motor face shaft hole coaxiality requirement is 0.05mm, the corresponding deep cavity processing tool is small, the lead coaxiality is unstable, and the assembly requirements cannot be guaranteed. Traditional processing uses single spindle processing, and the processing efficiency is extremely low. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and provide a method for processing double spindles of a die-cast aluminum alloy housing of a new energy plug-in hybrid vehicle.

[0004] The purpose of the present invention is achieved through the following technical solutions: A method for processing a double-spindle die-cast aluminum alloy housing of a new energy plug-in hybrid powertrain comprises the following steps: A. Clamp the workpiece on the hydraulic fixture and use hydraulic method to clamp the workpiece. The workpiece is the housing of the driving motor and is positioned through the blank hole and the blank surface. B. Finish four process surfaces, rough and finish two process holes. The diameter of the process holes is 10mm, the hole diameter tolerance is +0.022mm, and the position tolerance is ±0.1mm. Use carbide step drills to drill the peripheral holes. The diameter of the peripheral holes is 8.5mm, the hole diameter tolerance is ±0.1mm, and the position tolerance is 0.2mm. C. Use a disc milling cutter to pre-mill the first large surface of the joint, the flatness of the first large surface of the joint is 0.05mm, and rough and fine process the first pin hole, the diameter of the first pin hole is 10mm, the hole diameter tolerance is +0.015mm, and the position tolerance is 0.05mm; D. Use a rough and fine boring tool to process the first bearing hole. The diameter of the first bearing hole is 80mm, the aperture tolerance is +0.019mm, the cylindricity is 0.012mm, and the position tolerance is 0.05mm. Use a rough and fine boring tool to process the second bearing hole. The diameter of the second bearing hole is 80mm, the aperture tolerance is +0.01 / -0.05mm, the cylindricity is 0.012mm, and the position tolerance is 0.05mm. Use a rough and fine boring tool to process the third bearing hole. The diameter of the third bearing hole is 40.1mm, the aperture tolerance is +0.04mm, the cylindricity is 0.012mm, and the position tolerance is 0.05mm. E. Use a disc milling cutter to pre-mill the second large surface of the joint. The flatness of the second large surface is 0.05mm, and the parallelism is 0.08mm. Use a step drill to drill the peripheral threaded holes and process the internal threads. The nominal diameter of the internal threads of the peripheral threaded holes is 10mm, the pitch is 1.5mm, the tolerance grade is 6H, and the position tolerance is 0.3mm; F. Use roughing and finishing to process the second pin hole. The diameter of the second pin hole is 16mm, the hole diameter tolerance is +0.034 / +0.016mm, and the position tolerance is 0.05mm; G. Use a disc milling cutter to fine-mill the third joint surface, the flatness of the third joint surface is 0.05mm, pre-drill and fine-reame the first pin installation hole, the diameter of the first pin installation hole is 10mm, the hole diameter tolerance is -0.028 / -0.043mm, and the position tolerance is 0.05mm; H. Rough boring and fine boring of the first bearing mounting hole. The diameter of the first bearing mounting hole is 65mm, the hole diameter tolerance is -0.015 / -0.043mm, and the position accuracy is 0.05mm. Rough boring and fine boring of the second bearing mounting hole. The diameter of the second bearing mounting hole is 55.5mm, the hole diameter tolerance is 0.019mm, and the position accuracy is 0.05mm. I. Use a disc milling cutter to fine-mill the fourth large surface of the fourth large surface, the flatness of which is 0.05mm, pre-drill and fine-reame the second pin installation hole, the diameter of which is 8mm, the hole diameter tolerance is 0.015mm, and the position tolerance is 0.05mm; J. Rough boring and fine boring of the third bearing mounting hole. The diameter of the third bearing mounting hole is 61mm, the hole diameter tolerance is +0.046mm, the cylindrical position accuracy is 0.05mm, and the roughness is Ra1.6-3.2.

[0005] Compared with the prior art, the present invention has the following advantages: The present invention uses a high-performance hydraulic welded steel body welding fixture to reduce the deformation of the product clamped by the tooling, uses a high-precision guide bar boring tool, and performs boring and countersinking at the same time to avoid the risks of shrinkage and deformation of the bearing hole. The processing equipment adopts a high-precision dual-spindle horizontal machining center, and the X / Y / Z / A / B axes of the equipment are equipped with a grating scale compensation function. Since the processing environment changes unstably, the equipment has a temperature compensation function. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 This is the main view of the shell double spindle machining; Figure 2 It is the main view of the shell; Figure 3 It is the main view of the shell; Figure 4 for Figure 3 The front view of the shell after rotating 180°; Figure 5 for Figure 3 The main view of the shell after rotating 180°; Figure 6 for Figure 3 a cross-sectional view of the housing; Numbers in the figure: 10-blank hole, 20-blank surface, 30-process surface, 40-process hole, 50-peripheral hole, 60-first large combining surface, 70-first pin hole, 80-first bearing hole, 90-second bearing hole, 100-third bearing hole, 110-second large combining surface, 120-threaded hole, 130-second pin hole, 140-third large combining surface, 150-first pin mounting hole, 160-first bearing mounting hole, 170-second bearing mounting hole, 180-fourth large combining surface, 190-second pin mounting hole, 200-third bearing mounting hole. DETAILED DESCRIPTION

[0007] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The elements and features described in one embodiment of the present invention may be combined with the elements and features shown in one or more other embodiments. It should be noted that for the purpose of clarity, the representation and description of components and processes that are not related to the present invention and are known to those of ordinary skill in the art are omitted in the description. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0008] The present invention is further described below in conjunction with the accompanying drawings: A method for processing a double-spindle die-cast aluminum alloy housing of a new energy plug-in hybrid powertrain comprises the following steps: A. Clamp the workpiece on the tooling hydraulic fixture and clamp the workpiece hydraulically. The workpiece is a drive motor housing and is positioned through the blank hole 10 and the blank surface 20; B. Finish machining four process surfaces 30, rough machining, finish machining two process holes 40, the diameter of the process hole 40 is 10 mm, the hole diameter tolerance is +0.022 mm, the position tolerance is ±0.1 mm, and the peripheral holes 50 are drilled with a carbide step drill, the diameter of the peripheral holes 50 is 8.5 mm, the hole diameter tolerance is ±0.1 mm, and the position tolerance is 0.2 mm; C. Use a disc milling cutter to pre-mill the first large joint surface 60, the flatness of the first large joint surface 60 is 0.05mm, and rough and fine process the first pin hole 70, the diameter of the first pin hole 70 is 10mm aperture tolerance + 0.015mm, and the position tolerance is 0.05mm; D. Use a rough and fine boring tool to process the first bearing hole 80, the diameter of the first bearing hole 80 is 80 mm, the aperture tolerance is +0.019 mm, the cylindricity is 0.012 mm, and the position tolerance is 0.05 mm. Use a rough and fine boring tool to process the second bearing hole 90, the diameter of the second bearing hole 90 is 80 mm, the aperture tolerance is +0.01 / -0.05 mm, the cylindricity is 0.012 mm, and the position tolerance is 0.05 mm. Use a rough and fine boring tool to process the third bearing hole 100, the diameter of the third bearing hole 100 is 40.1 mm, the aperture tolerance is +0.04 mm, the cylindricity is 0.012 mm, and the position tolerance is 0.05 mm; E. Pre-mill the second large joint surface 110 with a disc milling cutter, the flatness of the second large joint surface 110 is 0.05 mm, the parallelism is 0.08 mm, and the peripheral threaded holes 120 are drilled with a step drill and the internal threads are processed. The nominal diameter of the internal threads of the peripheral threaded holes 120 is 10 mm, the pitch is 1.5 mm, the tolerance grade is 6H, and the position tolerance is 0.3 mm; F. The second pin hole 130 is processed by roughing and finishing. The diameter of the second pin hole 130 is 16 mm, the hole diameter tolerance is +0.034 / +0.016 mm, and the position tolerance is 0.05 mm; G. Use a disc milling cutter to finely mill the third large joint surface 140, the flatness of the third large joint surface 140 is 0.05mm, pre-drill and fine-reame the first pin mounting hole 150, the diameter of the first pin mounting hole 150 is 10mm, the hole diameter tolerance is -0.028 / -0.043mm, and the position tolerance is 0.05mm; H. Rough boring and fine boring of the first bearing mounting hole 160. The diameter of the first bearing mounting hole 160 is 65 mm, the hole diameter tolerance is -0.015 / -0.043 mm, and the position accuracy is 0.05 mm. Rough boring and fine boring of the second bearing mounting hole 170. The diameter of the second bearing mounting hole 170 is 55.5 mm, the hole diameter tolerance is 0.019 mm, and the position accuracy is 0.05 mm. I. Use a disc milling cutter to finely mill the fourth large joint surface 180, the flatness of the fourth large joint surface 180 is 0.05 mm, pre-drill and fine-reame the second pin mounting hole 190, the diameter of the second pin mounting hole 190 is 8 mm, the hole diameter tolerance is 0.015 mm, and the position tolerance is 0.05 mm; J. Rough boring and fine boring of the third bearing mounting hole 200. The diameter of the third bearing mounting hole 200 is 61 mm, the hole diameter tolerance is +0.046 mm, the cylindrical position accuracy is 0.05 mm, and the roughness is Ra1.6-3.2.

[0009] The present invention firstly rough-mills the process surface and the process hole, pre-mills the two joint surfaces, removes the feed port and slag bag on the joint surface, avoids vibration caused by large excess cutting, applies stress to the product, and can avoid the influence of deformation on the flatness of the large surface. The flatness can be guaranteed to be 0.05mm, and the corresponding high-precision hole position (0.05mm) capability is improved. The processing sequence selects the same sequence of rotation processing, which can better reduce the error between the rotating turntables.

[0010] The present invention uses a high-power dual-spindle horizontal machining center. The equipment is equipped with a grating scale compensation function for each axis, a body temperature detection compensation function, a high-torque dual spindle, and a guide bar boring tool for processing to better ensure the cylindricality (0.012mm) and high-precision aperture of the bearing hole, optimize the positive and negative coaxiality (0.05mm) of the shell, and use the Renishaw online detection compensation function to ensure the coaxiality accuracy. The dual spindles are used for simultaneous processing, which greatly improves the processing efficiency. Two products can be produced at the same time, which can meet the requirements of high-precision holes. The dual spindles can be processed separately, which improves the processing efficiency and product quality.

[0011] Finally, it should be noted that although the present invention and its advantages have been described in detail above, it should be understood that various changes, substitutions and transformations can be made without exceeding the spirit and scope of the present invention as defined by the appended claims. Moreover, the scope of the present invention is not limited to the specific embodiments of the processes, devices, means, methods and steps described in the specification. It will be readily understood by those skilled in the art from the disclosure of the present invention that existing and future processes, devices, means, methods or steps that perform substantially the same functions as the corresponding embodiments described herein or obtain substantially the same results as the corresponding embodiments described herein can be used according to the present invention. Therefore, the appended claims are intended to include such processes, devices, means, methods or steps within their scope.

Claims

1. A method for processing double spindles of die-cast aluminum alloy housing for new energy plug-in hybrid power, characterized in that: The following steps are involved: A. Clamping a workpiece on a tooling hydraulic fixture, and clamping the workpiece by hydraulic means, the workpiece is a drive motor housing, and is positioned by a blank hole (10) and a blank surface (20); B. Finishing four process surfaces (30), rough machining, finishing two process holes (40), wherein the diameter of the process holes (40) is 10 mm, the hole diameter tolerance is +0.022 mm, and the position tolerance is ±0.1 mm; drilling the peripheral holes (50) with a carbide step drill, wherein the diameter of the peripheral holes (50) is 8.5 mm, the hole diameter tolerance is ±0.1 mm, and the position tolerance is 0.2; C. Pre-milling the first large joint surface (60) with a disc milling cutter, the flatness of the first large joint surface (60) being 0.05 mm, and rough-finishing the first pin hole (70), the diameter of the first pin hole (70) being 10 mm, the hole diameter tolerance being +0.015 mm, and the position tolerance being 0.05; D. Processing the first bearing hole (80) with a rough and fine boring tool, wherein the diameter of the first bearing hole (80) is 80 mm, the aperture tolerance is +0.019 mm, the cylindricity is 0.012 mm, and the position tolerance is 0.05 mm. Processing the second bearing hole (90) with a rough and fine boring tool, wherein the diameter of the second bearing hole (90) is 80 mm, the aperture tolerance is +0.01 / -0.05 mm, the cylindricity is 0.012 mm, and the position tolerance is 0.05 mm. Processing the third bearing hole (100) with a rough and fine boring tool, wherein the diameter of the third bearing hole (100) is 40.1 mm, the aperture tolerance is +0.04 mm, the cylindricity is 0.012 mm, and the position tolerance is 0.05 mm. E. Pre-milling the second large joint surface (110) with a disc milling cutter, wherein the flatness of the second large joint surface (110) is 0.05 mm and the parallelism is 0.08 mm. Drilling each peripheral threaded hole (120) with a step drill and processing the internal thread, wherein the nominal diameter of the internal thread of the peripheral threaded hole (120) is 10 mm, the pitch is 1.5 mm, the tolerance grade is 6H, and the position tolerance is 0.3 mm; F. Rough and fine machining the second pin hole (130), wherein the diameter of the second pin hole (130) is 16 mm, the hole diameter tolerance is +0.034 / +0.016 mm, and the position tolerance is 0.05 mm; G. Use a disc milling cutter to finely mill the third large joint surface (140), wherein the flatness of the third large joint surface (140) is 0.05 mm, and pre-drill and finely ream the first pin mounting hole (150), wherein the diameter of the first pin mounting hole (150) is 10 mm, the hole diameter tolerance is -0.028 / -0.043 mm, and the position tolerance is 0.05 mm; H. Rough boring and fine boring of the first bearing mounting hole (160), wherein the diameter of the first bearing mounting hole (160) is 65 mm, the hole diameter tolerance is -0.015 / -0.043 mm, and the position accuracy is 0.05 mm; Rough boring and fine boring of the second bearing mounting hole (170), wherein the diameter of the second bearing mounting hole (170) is 55.5 mm, the hole diameter tolerance is 0.019 mm, and the position accuracy is 0.05 mm; I. Use a disc milling cutter to finely mill the fourth large joint surface (180), wherein the flatness of the fourth large joint surface (180) is 0.05 mm, and pre-drill and finely ream the second pin mounting hole (190), wherein the diameter of the second pin mounting hole (190) is 8 mm, the hole diameter tolerance is 0.015 mm, and the position tolerance is 0.05 mm; J. Rough boring and fine boring of the third bearing mounting hole (200), wherein the diameter of the third bearing mounting hole (200) is 61 mm, the hole diameter tolerance is +0.046 mm, the cylindrical position accuracy is 0.05 mm, and the roughness Ra is 1.6-3.2.

Images