CN114799770B - Processing technology of die-casting aluminum alloy speed reducer shell - Google Patents
Processing technology of die-casting aluminum alloy speed reducer shell Download PDFInfo
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- CN114799770B CN114799770B CN202210586866.XA CN202210586866A CN114799770B CN 114799770 B CN114799770 B CN 114799770B CN 202210586866 A CN202210586866 A CN 202210586866A CN 114799770 B CN114799770 B CN 114799770B
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- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
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Abstract
The invention relates to a processing technology of a die-casting aluminum alloy speed reducer shell, which comprises a front shell and a rear shell, wherein a process boss is finely milled, a process hole is finely drilled, and finally a large surface is pre-milled and combined for positioning, so that the influence of the deformation stress of the die-casting aluminum alloy on the flatness of the large surface of a product is reduced, and the flatness of a combined mounting surface of the front shell and the rear shell of the speed reducer and the position requirement of less than phi 0.04 of an assembly hole of the front shell and the rear shell of the speed reducer can be ensured. When the front shell is machined, the bearing mounting holes are machined simultaneously by using a multi-section composite diamond guide bar cutter, then the on-line measurement is performed by adopting a machine tool, the coordinate compensation function is automatically corrected, the bearing mounting holes of the front shell of the speed reducer of D246.5 are machined, and the coaxiality requirement of phi 0.04 is ensured. When the shell is machined, the oil seal hole is reversely bored by using a reversely boring cutter tool, so that the coaxiality requirement of phi 0.04 is ensured.
Description
Technical Field
The invention belongs to the technical field of die-casting aluminum alloy machining, and mainly relates to a machining process of a die-casting aluminum alloy speed reducer shell.
Background
At present, with the rapid development of new energy automobiles, the structure of an automobile die-casting aluminum alloy part product is complex, and the processing precision is high. When the front shell and the rear shell of the speed reducer are processed, the precision requirements of the joint surface and the bearing hole of the front shell and the rear shell of the speed reducer are high, the flatness requirements of the processing area are 0.03MM, the cylindricity of the bearing hole, the coaxiality and the position degree cannot be guaranteed, and the processing is unstable.
Disclosure of Invention
The invention aims to provide a processing technology of a die-casting aluminum alloy speed reducer shell, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: a processing technology of a die-casting aluminum alloy speed reducer shell comprises a speed reducer front shell and a speed reducer rear shell, and specifically comprises the following steps:
A. machining a front shell of the speed reducer:
a. clamping a workpiece to be processed on a fixture, clamping the workpiece by using an oil pressure mode, wherein the workpiece is a front shell of the speed reducer and is positioned through a front positioning hole and a front positioning surface;
b. finish milling the front of the three process bosses; pre-drilling and finely drilling two-sequence positioning holes, wherein the hole diameter of the two-sequence positioning holes is 8.5MM, the hole diameter tolerance is 0.02MM, the position tolerance is 0.1MM, each peripheral threaded hole is drilled by using a stepped drill and an internal thread is machined, the nominal diameter of the internal thread of the peripheral threaded hole is 8MM, the screw pitch is 1.25MM, the tolerance level is 6H, and the position tolerance is 0.4MM;
c. pre-milling a front large surface by using a disc milling cutter, wherein the flatness of the front large surface is 0.1MM, pre-drilling and finish reaming a cup plug mounting hole, the diameter of the cup plug mounting hole is 32MM, the aperture tolerance is 0.03MM, and the position tolerance is 0.25MM;
d. drilling an oil hole by using a step, wherein the diameter of the oil hole is 5MM;
e. pre-milling a first front large surface by using a disc milling cutter, wherein the flatness of the first front large surface is 0.1MM, drilling each first peripheral threaded hole by using a stepped drill, and machining internal threads, wherein the nominal diameter of the internal threads of the first peripheral threaded holes is 6MM, the pitch is 1MM, the tolerance level is 6H, and the position tolerance is 0.4MM;
f. drilling a first oil passing hole with a step, wherein the diameter of the first oil passing hole is 5MM;
g. finish milling a second front large surface by using a disc milling cutter, wherein the flatness of the second front large surface is 0.03MM, pre-drilling and finish reaming the front hole for pin installation, the diameter of the front hole for pin installation is 8MM, the aperture tolerance is 0.015MM, and the position tolerance is 0.05MM;
h. rough boring and fine boring a bearing installation front hole, wherein the diameter of the bearing installation front hole is 80MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the diameter of the first bearing installation front hole is 68MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the position degree is 0.04MM, the diameter of the second bearing installation front hole is 75MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM and the position degree is 0.04MM; rough boring and fine boring a third bearing mounting front hole, wherein the diameter of the third bearing mounting front hole is 62.76MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM and the position degree is 0.05MM;
i. finish milling a third front large surface by using a disc milling cutter, wherein the flatness of the third front large surface is 0.03MM, pre-drilling and finish reaming a first pin installation front hole, the diameter of the first pin installation front hole is 8MM, the aperture tolerance is 0.015MM, and the position tolerance is 0.05MM;
j. rough boring and finish boring a fourth bearing installation front hole, wherein the diameter of the fourth bearing installation front hole is 246.5MM, the aperture tolerance is 0.05MM, the cylindricity is 0.03MM, the position degree is 0.05MM, the rough boring and finish boring of a fifth bearing installation front hole are carried out, the diameter of the fifth bearing installation front hole is 61MM, the aperture tolerance is 0.03MM, the cylindricity is 0.02MM, the position degree is 0.05MM, and the roughness Ra1.6-3.2.
B. Machining a rear shell of the speed reducer:
a. clamping a workpiece to be processed on a fixture, clamping the workpiece by using an oil pressure mode, wherein the workpiece is a rear shell of the speed reducer and is positioned through a rear positioning hole and a rear positioning surface;
b. pre-milling a rear large surface by using a disc milling cutter, wherein the flatness of the rear large surface is 0.1MM; pre-drilling, fine drilling the process positioning rear holes, wherein the hole diameter of the process positioning rear holes is 8.5MM, the hole diameter tolerance is 0.02MM, the position tolerance is 0.1MM, the step drilling is used for drilling the peripheral bolt through holes, the diameter of the peripheral bolt through holes is 8.5MM, the hole diameter tolerance is 0.1MM, and the position tolerance is 0.4MM;
c. roughly boring a bearing mounting rear hole, wherein the diameter of the bearing mounting rear hole is 80MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the diameter of the first bearing mounting rear hole is 68MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the position degree is 0.04MM, the bearing mounting rear hole is roughly bored, the diameter of the second bearing mounting rear hole is 75MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM and the position degree is 0.04MM; roughly boring a third bearing post-installation hole, wherein the diameter of the third bearing post-installation hole is 61MM, the aperture tolerance is 0.03MM, the cylindricity is 0.02MM, the position degree is 0.05MM, and the roughness Ra1.6-3.2;
d. finish milling the rear of the three process bosses, drilling a threaded hole by using a stepped drill and machining an internal thread, wherein the nominal diameter of the internal thread of the threaded hole is 12MM, the thread pitch is 1.25MM, the tolerance level is 6H, and the position tolerance is 0.4MM;
e. finely milling a first rear positioning surface by using a disc milling cutter, wherein the flatness of the first rear positioning surface is 0.03MM, pre-drilling and finely reaming a post-mounting hole of a pin, the diameter of the post-mounting hole of the pin is 8MM, the aperture tolerance is 0.015MM, and the position tolerance is 0.05MM;
f. finely boring a fourth bearing mounting hole, wherein the diameter of the fourth bearing mounting hole is 80MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the diameter of the fifth bearing mounting hole is 68MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the position degree is 0.04MM, the sixth bearing mounting hole is finely bored, the diameter of the sixth bearing mounting hole is 75MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM and the position degree is 0.04MM; reversely fine boring a seventh bearing mounting hole, wherein the diameter of the seventh bearing mounting hole is 61MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the position degree is 0.05MM, the roughness Ra1.6-3.2, the first threaded hole is drilled by using a stepped drill and is internally threaded, the nominal diameter of the internal thread of the first threaded hole is 6MM, the thread pitch is 16MM, the tolerance level is 6H, and the position tolerance is 0.4MM.
Compared with the prior art, the invention has the beneficial effects that:
1. the process boss is finely milled, the process hole is finely drilled, and finally, the large surface is pre-milled and combined to be positioned, so that the influence of the deformation stress of the die-casting aluminum alloy on the flatness of the large surface of the product is reduced, and the flatness of the combined mounting surfaces of the front shell and the rear shell of the speed reducer and the position requirement of less than phi 0.04 of the assembly holes of the front shell and the rear shell of the speed reducer can be ensured.
2. When the front shell is machined, the bearing mounting holes are machined simultaneously by using a multi-section composite diamond guide bar cutter, then the on-line measurement is performed by adopting a machine tool, the coordinate compensation function is automatically corrected, the bearing mounting holes of the front shell of the speed reducer of D246.5 are machined, and the coaxiality requirement of phi 0.04 is ensured.
3. When the shell is machined, the oil seal hole is reversely bored by using a reversely boring cutter tool, so that the coaxiality requirement of phi 0.04 is ensured.
Drawings
FIG. 1 is a front view of a front housing of a speed reducer;
FIG. 2 is a front view of the front housing of the reduction gear;
FIG. 3 is a front view of the front housing of the speed reducer of FIG. 2 rotated 180;
FIG. 4 is a front view of the front housing of the speed reducer of FIG. 2 rotated 180;
FIG. 5 is a cross-sectional view of the front housing of the speed reducer of FIG. 1;
reference numerals in the drawings: 1-a reducer front shell, 101-a front positioning hole, 102-a front positioning surface, 103-a process boss front surface, 104-a two-order positioning hole, 105-a peripheral threaded hole, 106-a front large surface, 107-a cup plug mounting hole, 108-an oil passing hole, 109-a first front large surface, 1010-a first peripheral threaded hole, 1011-a first oil passing hole, 1012-a second front large surface, 1013-a pin mounting front hole, 1014-a bearing mounting front hole, 1015-a first bearing mounting front hole, 1016-a second bearing mounting front hole, 1017-a third bearing mounting front hole, 1018-a third front large surface, 1019-a first pin mounting front hole, 1020-a fourth bearing mounting front hole, 1021-a fifth bearing mounting front hole;
FIG. 6 is a front view of the rear housing of the reduction gear;
FIG. 7 is a front view of the rear housing of the reduction gear;
FIG. 8 is a front view of the rear housing of the speed reducer of FIG. 2 rotated 180;
FIG. 9 is a front view of the rear housing of the reduction gear shown in FIG. 2 rotated 180
FIG. 10 is a cross-sectional view of the rear housing of the speed reducer of FIG. 1;
reference numerals in the drawings: the rear housing of the 2-speed reducer, the 201-rear positioning hole, the 202-rear positioning surface, the 203-rear large surface, the 204-process positioning rear hole, the 205-peripheral bolt through hole, the 206-bearing mounting rear hole, the 207-first bearing mounting rear hole, the 208-second bearing mounting rear hole, the 209-third bearing mounting rear hole, the 2010-process boss rear, the 2011-threaded hole, the 2012-first rear positioning surface, the 2013-pin mounting rear hole, the 2014-fourth bearing mounting rear hole, the 2015-fifth bearing mounting rear hole, the 2016-sixth bearing mounting rear hole, the 2017-seventh bearing mounting rear hole and the 2018-first threaded hole.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
The embodiment provides a technical scheme: the processing technology of the die-casting aluminum alloy speed reducer shell comprises a speed reducer front shell 1 and a speed reducer rear shell 2, wherein the processing sequence of the speed reducer front shell and the rear shell is not limited, namely the speed reducer rear shell can be processed firstly and then the speed reducer front shell can be processed; the specific processing steps are as follows:
A. machining a front shell of the speed reducer:
a. clamping a workpiece to be processed on a fixture, clamping the workpiece by using an oil pressure mode, wherein the workpiece is a front shell of the speed reducer, and positioning the workpiece through a front positioning hole 101 and a front positioning surface 102;
b. finish milling the front 103 of the three process bosses; pre-drilling and fine-drilling a second-order positioning hole 104, wherein the hole diameter of the second-order positioning hole 104 is 8.5MM, the hole diameter tolerance is 0.02MM, the position tolerance is 0.1MM, each peripheral threaded hole 105 is drilled by using a stepped drill and internal threads are machined, the nominal diameter of the internal threads of the peripheral threaded holes 105 is 8MM, the screw pitch is 1.25MM, the tolerance level is 6H, and the position tolerance is 0.4MM;
c. pre-milling a front large surface 106 by using a disc milling cutter, wherein the flatness of the front large surface 106 is 0.1MM, pre-drilling and finish reaming a cup plug mounting hole 107, the diameter of the cup plug mounting hole 107 is 32MM, the aperture tolerance is 0.03MM, and the position tolerance is 0.25MM;
d. drilling an oil hole 108 by using a step, wherein the diameter of the oil hole 108 is 5MM;
e. pre-milling a first front large surface 109 by using a disc milling cutter, wherein the flatness of the first front large surface 109 is 0.1MM, drilling each first peripheral threaded hole 1010 by using a stepped drill and machining internal threads, wherein the nominal diameter of the internal threads of the first peripheral threaded holes 1010 is 6MM, the pitch is 1MM, the tolerance level is 6H, and the position tolerance is 0.4MM;
f. drilling a first oil passing hole 1011 by using a step, wherein the diameter of the first oil passing hole 1011 is 5MM;
g. finish milling a second front large surface 1012 by a disc milling cutter, wherein the flatness of the second front large surface 1012 is 0.03MM, pre-drilling and finish reaming pin installation front holes 1013, the diameter of the pin installation front holes 1013 is 8MM, the aperture tolerance is 0.015MM, and the position tolerance is 0.05MM;
h. rough boring and fine boring of the bearing mounting front hole 1014, wherein the diameter of the bearing mounting front hole 1014 is 80MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the diameter of the first bearing mounting front hole 1015 is 68MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the position degree is 0.04MM, the diameter of the second bearing mounting front hole 1016 is 75MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM and the position degree is 0.04MM; rough boring and fine boring a third bearing mounting front hole 1017, wherein the diameter of the third bearing mounting front hole 1017 is 62.76MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, and the position degree is 0.05MM;
i. finish milling a third front large surface 1018 by a disc milling cutter, wherein the flatness of the third front large surface 1018 is 0.03MM, pre-drilling and finish reaming a first pin installation front hole 1019, the diameter of the first pin installation front hole 1019 is 8MM, the aperture tolerance is 0.015MM, and the position tolerance is 0.05;
j. rough boring and finish boring a fourth bearing installation front hole 1020, wherein the diameter of the fourth bearing installation front hole 1020 is 246.5MM, the aperture tolerance is 0.05MM, the cylindricity is 0.03MM, the position degree is 0.05MM, the fifth bearing installation front hole 1021 is rough boring and finish boring, the diameter of the fifth bearing installation front hole 1021 is 61MM, the aperture tolerance is 0.03MM, the cylindricity is 0.02MM, the position degree is 0.05MM, and the roughness Ra1.6-3.2.
When the front shell is machined, the bearing mounting holes are machined simultaneously by using a multi-section composite diamond guide bar cutter, then the on-line measurement is performed by adopting a machine tool, the coordinate compensation function is automatically corrected, the bearing mounting holes of the front shell of the speed reducer of D246.5 are machined, and the coaxiality requirement of phi 0.04 is ensured.
B. Machining a rear shell of the speed reducer:
a. clamping a workpiece to be processed on a fixture, clamping the workpiece by using an oil pressure mode, wherein the workpiece is a rear shell of the speed reducer and is positioned through a rear positioning hole 201 and a rear positioning surface 202;
b. pre-milling a rear large surface 203 by using a disc milling cutter, wherein the flatness of the rear large surface 203 is 0.1MM; pre-drilling, fine-drilling the process positioning rear holes 204, wherein the hole diameter of the process positioning rear holes 204 is 8.5MM, the hole diameter tolerance is 0.02MM, the position tolerance is 0.1MM, each peripheral bolt through hole 205 is drilled by using a stepped drill, the diameter of each peripheral bolt through hole 205 is 8.5MM, the hole diameter tolerance is 0.1MM, and the position tolerance is 0.4MM;
c. the bearing mounting rear hole 206 is roughly bored, the diameter of the bearing mounting rear hole 206 is 80MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the diameter of the first bearing mounting rear hole 207 is roughly bored, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the position degree is 0.04MM, the bearing mounting rear hole 208 is roughly bored, the diameter of the second bearing mounting rear hole 208 is 75MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, and the position degree is 0.04MM; roughly boring a third bearing mounting rear hole 209, wherein the diameter of the third bearing mounting rear hole 209 is 61MM, the aperture tolerance is 0.03MM, the cylindricity is 0.02MM, the position degree is 0.05MM, and the roughness Ra1.6-3.2;
d. finish milling the rear 2010 of the three process bosses, drilling a threaded hole 2011 by using a stepped drill and machining an internal thread, wherein the nominal diameter of the internal thread of the threaded hole 2011 is 12MM, the thread pitch is 1.25MM, the tolerance level is 6H, and the position tolerance is 0.4MM;
e. finish milling a first rear positioning surface 2012 by using a disc milling cutter, wherein the flatness of the first rear positioning surface 2012 is 0.03MM, the diameter of a pre-drilled and finish-reamed pin-mounted hole 2013 is 8MM, the aperture tolerance is 0.015MM, and the position tolerance is 0.05MM;
f. finely boring a fourth bearing mounting hole 2014, wherein the diameter of the fourth bearing mounting hole 2014 is 80MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the diameter of the fifth bearing mounting hole 2015 is 68MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the position degree is 0.04MM, the sixth bearing mounting hole 2016 is finely bored, the diameter of the sixth bearing mounting hole 2016 is 75MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, and the position degree is 0.04MM; reversely fine boring a seventh bearing mounting hole 2017, wherein the diameter of the seventh bearing mounting hole 2017 is 61MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the position degree is 0.05MM, the roughness Ra1.6-3.2 is achieved, a first threaded hole 2018 is drilled by a stepped drill, the internal thread is machined, the nominal diameter of the internal thread of the first threaded hole 2018 is 6MM, the thread pitch is 16MM, the tolerance level is 6H, and the position tolerance is 0.4MM.
When the shell is machined, the oil seal hole is reversely bored by using a reversely boring cutter tool, so that the coaxiality requirement of phi 0.04 is ensured.
The invention finely mills the process boss, finely drills the process hole, and finally pre-mills the combined positioning large surface, so as to reduce the influence of the deformation stress of the die-casting aluminum alloy on the flatness of the large surface of the product, thereby ensuring the flatness of the combined mounting surface of the front shell and the rear shell of the speed reducer within 0.03MM and the position requirement of phi 0.04 of the assembly holes of the front shell and the rear shell of the speed reducer.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, article, or apparatus.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and that identical reference numerals are used to designate identical devices, and thus descriptions thereof will be omitted.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. The processing technology of a die-casting aluminum alloy speed reducer shell comprises a speed reducer front shell (1) and a speed reducer rear shell (2), and is characterized in that: the method comprises the following specific steps:
A. machining a front shell (1) of the speed reducer:
a. clamping a workpiece to be processed on a fixture, clamping the workpiece by using an oil pressure mode, wherein the workpiece is a front shell of the speed reducer, and positioning the workpiece through a front positioning hole (101) and a front positioning surface (102);
b. finish milling three process boss fronts (103); pre-drilling and fine-drilling two-sequence positioning holes (104), wherein the diameter of the two-sequence positioning holes (104) is 8.5MM, the aperture tolerance is 0.02MM, the position tolerance is 0.1MM, each peripheral threaded hole (105) is drilled by using a stepped drill and the internal threads are machined, the nominal diameter of the internal threads of the peripheral threaded holes (105) is 8MM, the thread pitch is 1.25MM, the tolerance level is 6H, and the position tolerance is 0.4MM;
c. pre-milling a front large surface (106) by using a disc milling cutter, wherein the flatness of the front large surface (106) is 0.1MM, pre-drilling and finely reaming a cup plug mounting hole (107), the diameter of the cup plug mounting hole (107) is 32MM, the aperture tolerance is 0.03MM, and the position tolerance is 0.25MM;
d. drilling an oil hole (108) by using a stepped drill, wherein the diameter of the oil hole (108) is 5MM;
e. pre-milling a first front large surface (109) by using a disc milling cutter, wherein the flatness of the first front large surface (109) is 0.1MM, drilling each first peripheral threaded hole (1010) by using a stepped drill and machining internal threads, wherein the nominal diameter of the internal threads of the first peripheral threaded holes (1010) is 6MM, the pitch is 1MM, the tolerance level is 6H, and the position tolerance is 0.4MM;
f. drilling a first oil passing hole (1011) by using a stepped drill, wherein the diameter of the first oil passing hole (1011) is 5MM,
g. finish milling a second front large surface (1012) by a disc milling cutter, wherein the flatness of the second front large surface (1012) is 0.03MM, pre-drilling and finish reaming a pin installation front hole (1013), the diameter of the pin installation front hole (1013) is 8MM, the aperture tolerance is 0.015MM, and the position tolerance is 0.05MM;
h. a rough and fine boring bearing installation front hole (1014), wherein the diameter of the bearing installation front hole (1014) is 80MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the diameter of the first bearing installation front hole (1015) is 68MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the position degree is 0.04MM, the diameter of the second bearing installation front hole (1016) is 75MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM and the position degree is 0.04MM; rough boring and fine boring a third bearing mounting front hole (1017), wherein the diameter of the third bearing mounting front hole (1017) is 62.76MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM and the position degree is 0.05MM;
i. finish milling a third front large face (1018) with a disc milling cutter, wherein the third front large face (1018) has a flatness of 0.03MM, pre-drilling and finish reaming a first pin installation front hole (1019), the first pin installation front hole (1019) has a diameter of 8MM, a hole diameter tolerance of 0.015MM and a position tolerance of 0.05MM;
j. coarsely boring and finely boring a fourth bearing installation front hole (1020), wherein the diameter of the fourth bearing installation front hole (1020) is 246.5MM, the aperture tolerance is 0.05MM, the cylindricity is 0.03MM, the position degree is 0.05MM, the diameter of the fifth bearing installation front hole (1021) is 61MM, the aperture tolerance is 0.03MM, the cylindricity is 0.02MM, the position degree is 0.05MM, and the roughness Ra1.6-3.2;
B. machining a rear shell (2) of the speed reducer:
a. clamping a workpiece to be processed on a fixture, clamping the workpiece by using an oil pressure mode, wherein the workpiece is a rear shell of the speed reducer, and positioning the workpiece through a rear positioning hole (201) and a rear positioning surface (202);
b. pre-milling a rear large face (203) with a disc milling cutter, wherein the flatness of the rear large face (203) is 0.1MM; pre-drilling and fine-drilling process positioning rear holes (204), wherein the diameter of the process positioning rear holes (204) is 8.5MM, the aperture tolerance is 0.02MM, the position tolerance is 0.1MM, each peripheral bolt through hole (205) is drilled by using a stepped drill, the diameter of each peripheral bolt through hole (205) is 8.5MM, the aperture tolerance is 0.1MM, and the position tolerance is 0.4MM;
c. a rough boring bearing mounting rear hole (206), wherein the diameter of the bearing mounting rear hole (206) is 80MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the diameter of the rough boring first bearing mounting rear hole (207) is 68MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the position degree is 0.04MM, the diameter of the rough boring second bearing mounting rear hole (208), the diameter of the second bearing mounting rear hole (208) is 75MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, and the position degree is 0.04MM; roughly boring a third bearing mounting rear hole (209), wherein the diameter of the third bearing mounting rear hole (209) is 61MM, the aperture tolerance is 0.03MM, the cylindricity is 0.02MM, the position degree is 0.05MM, and the roughness Ra1.6-3.2;
d. finish milling the rear surface (2010) of the three process bosses, drilling a threaded hole (2011) by using a stepped drill and machining an internal thread, wherein the nominal diameter of the internal thread of the threaded hole (2011) is 12MM, the thread pitch is 1.25MM, the tolerance level is 6H, and the position tolerance is 0.4MM;
e. finish milling a first rear locating surface (2012) with a disc milling cutter, wherein the flatness of the first rear locating surface (2012) is 0.03MM, pre-drilling and finish reaming a post-pin-mounting hole (2013), the diameter of the post-pin-mounting hole (2013) is 8MM, the aperture tolerance is 0.015MM, and the position tolerance is 0.05MM;
f. finely boring a fourth bearing mounting hole (2014), wherein the diameter of the fourth bearing mounting hole (2014) is 80MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the diameter of the fifth bearing mounting hole (2015) is 68MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the position degree is 0.04MM, the diameter of the sixth bearing mounting hole (2016) is 75MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, and the position degree is 0.04MM; reversely fine boring a seventh bearing mounting hole (2017), wherein the diameter of the seventh bearing mounting hole (2017) is 61MM, the aperture tolerance is 0.019MM, the cylindricity is 0.02MM, the position degree is 0.05MM, the roughness Ra1.6-3.2 is achieved, a first threaded hole (2018) is drilled through a stepped drill, the internal thread of the first threaded hole (2018) is machined, the nominal diameter of the internal thread is 6MM, the thread pitch is 16MM, the tolerance level is 6H, and the position tolerance is 0.4MM.
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