CN112122886A - Method for processing lower cylinder body monomer of three-cylinder engine - Google Patents
Method for processing lower cylinder body monomer of three-cylinder engine Download PDFInfo
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- CN112122886A CN112122886A CN202010985957.1A CN202010985957A CN112122886A CN 112122886 A CN112122886 A CN 112122886A CN 202010985957 A CN202010985957 A CN 202010985957A CN 112122886 A CN112122886 A CN 112122886A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/006—Camshaft or pushrod housings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
- F02F7/0095—Constructing engine casings
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Abstract
The invention relates to a method for processing a lower cylinder body monomer of a three-cylinder engine, which is characterized in that a lower cylinder body to be processed is clamped on a clamp; pre-milling a cylinder body connecting surface; finely drilling a second-order positioning hole; and precisely drilling each peripheral bolt through hole and each oil channel hole. Milling a mounting surface of the lower oil pan and drilling a threaded hole; finish machining a liquid level sensor mounting hole and a liquid level oil filter mounting hole; finely machining the mounting surface and the threaded hole of the filter; and precisely drilling three-order positioning holes. Finely milling a cylinder body connecting surface; finely drilling four-sequence positioning holes; finely milling an oil seal mounting hole; finely milling a balance shaft mounting surface and drilling a threaded hole; pre-milling a chain cover mounting surface, a gearbox mounting surface and a drilling threaded hole; milling an oil channel hole sealing groove and an end face; and milling the end face of the oil duct hole, and drilling the oil duct hole and the threaded hole. And (3) finely milling a chain cover mounting surface, a starter mounting surface and a gearbox mounting surface. The invention is used for machining the lower cylinder body of the novel three-cylinder engine, realizes the high precision requirement and high stability of the product through a more optimized process, and ensures the stable mass production and higher machining precision of the product.
Description
Technical Field
The invention relates to a method for processing a lower cylinder body monomer of a three-cylinder engine.
Background
With the concern of people about energy depletion and the reality of increasingly serious environmental pollution, the energy consumption and the exhaust emission standards of automobiles are strictly controlled by countries in the world. Based on the pressure of energy conservation and emission reduction, the development direction of the traditional energy automobile mainly aims to reduce the weight and improve the fuel oil and driving efficiency. The advent of three cylinder engines is the automotive industry, developing small displacement, and highly integrated, lightweight engines to meet increasingly stringent emission standards.
The lower cylinder is the lower half of the engine cylinder, also known as the lower crankcase. The function integrates the functions of sealing the cylinder body, storing lubricating oil, filtering and cooling the lubricating oil and installing a balance shaft. Due to high integration, the oil sump is much higher in machining complexity and machining precision than a common oil sump.
The processing mode of the prior art to the face and the hole on the lower cylinder body is single, the mode of processing one by one is mainly adopted, manpower, material resources and energy are consumed, and the guarantee to the processing precision is difficult.
Disclosure of Invention
The invention aims to provide a method for processing a lower cylinder body monomer of a three-cylinder engine, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a processing method of a lower cylinder body monomer of a three-cylinder engine comprises the following specific steps:
A. clamping a lower cylinder body to be machined on a machining clamp, and positioning through a three-sequence positioning hole and a positioning surface;
B. pre-milling a cylinder body connecting surface; pre-drilling and fine-drilling two-sequence positioning holes, wherein the hole diameter of the two-sequence positioning holes is 11.5mm, the hole diameter tolerance is 0.1, and the position tolerance is 0.15;
C. precisely drilling each peripheral bolt through hole, wherein the hole diameter of each peripheral bolt through hole is 11.5mm, and the aperture tolerance is 0.15; precisely drilling an oil passage hole, wherein the diameter of the oil passage hole is 12mm, and the tolerance of the hole diameter is 0.15;
D. milling a threaded hole surface; a step drill is used for drilling a first threaded hole and machining an internal thread, the nominal diameter of the internal thread of the first threaded hole is 10mm, the thread pitch is 1.25, and the tolerance grade is 6H; drilling a threaded bottom hole of a partition plate mounting hole by using a stepped drill and processing an internal thread, wherein the nominal diameter of the internal thread of the partition plate mounting hole is 6mm, the thread pitch is 1, and the tolerance grade is 6H;
E. milling a lower oil pan mounting surface, and removing burrs from the lower oil pan mounting surface; drilling a mounting hole of a lower oil pan and tapping internal threads, wherein the nominal diameter of the threads of the mounting hole of the lower oil pan is 6mm, the thread pitch is 1, and the tolerance grade is 6H;
F. roughly machining and finely machining a liquid level sensor mounting hole, wherein the aperture of the liquid level sensor mounting hole is 20.1mm, and the tolerance value is 0.015; roughly machining and finely machining an oil filter mounting hole, wherein the aperture of the oil filter mounting hole is 31.7mm, and the tolerance value is 0.03;
G. milling a threaded hole surface; a step drill is used for drilling a second threaded hole and machining an internal thread, the nominal diameter of the internal thread of the second threaded hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H; finely machining the filter mounting surface, drilling a filter mounting threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the internal thread of the filter mounting threaded bottom hole is 24mm, the thread pitch is 1.5, and the tolerance grade is 6H;
H. pre-drilling and fine-drilling three-sequence positioning holes, wherein the hole diameter of each three-sequence positioning hole is 13mm, the hole diameter tolerance is 0.1, and the position tolerance is 0.15;
I. finely milling the cylinder body connecting surface, removing burrs from the cylinder body connecting surface, wherein the flatness of the cylinder body connecting surface is 0.05/100, and the surface profile degree is 0.15;
J. pre-drilling and precisely drilling a product positioning hole, wherein the hole diameter of the product positioning hole is 6mm, the aperture tolerance is 0.011, and the position tolerance is 0.15;
K. pre-milling and finish-milling a transmission shaft oil seal mounting hole, wherein the diameter of the transmission shaft oil seal mounting hole is 106mm, the tolerance of the aperture is 0.027, and the tolerance of the position degree is 0.05;
l, finish milling a balance shaft mounting surface, wherein the flatness of the balance shaft mounting surface is 0.05, and the surface tolerance value is 0.04; drilling a threaded bottom hole of a mounting hole of the balance shaft and processing an internal thread, wherein the nominal diameter of the internal thread of the mounting hole of the balance shaft is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H;
m, pre-milling a chain cover mounting surface and a gearbox mounting surface; drilling a threaded bottom hole of a chain cover mounting hole and machining an internal thread, wherein the nominal diameter of the internal thread of the chain cover mounting hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H;
milling an oil passage hole sealing groove and an oil passage hole end face, drilling an oil passage hole and a threaded bottom hole of a plug mounting hole by using a step drill, and processing internal threads, wherein the hole diameter of the oil passage hole is 14mm, the hole diameter is 0.1 of tolerance, the nominal diameter of the internal threads of the plug mounting hole is 18mm, the thread pitch is 1.5, and the tolerance grade is 6H;
o, finely milling a chain cover mounting surface, removing burrs from the chain cover mounting surface, wherein the planeness of the chain cover mounting surface is 0.1, the verticality is 0.15, and the surface tolerance value is 0.05; precisely drilling an oil passage hole, wherein the diameter of the oil passage hole is 14mm, and the aperture tolerance is 0.15;
p, finely milling a starter mounting surface, wherein the tolerance value of the starter mounting surface is 0.05; milling a starter shaft clearance hole, wherein the diameter of the starter shaft clearance hole is 76mm, and the tolerance of the aperture is 0.1;
q, finely milling a gearbox mounting surface, removing burrs from the gearbox mounting surface, wherein the flatness of the gearbox mounting surface is 0.1/100, the verticality is 0.1, and the surface tolerance value is 0.1; drilling a bolt through hole on the mounting surface of the gearbox, wherein the hole diameter of the bolt through hole on the mounting surface of the gearbox is 11.5mm, and the aperture tolerance is 0.15; and drilling a threaded bottom hole of the gearbox mounting hole and processing an internal thread, wherein the nominal diameter of the internal thread of the gearbox mounting hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H.
The invention is further improved in that: the method comprises the steps of pre-milling and finish-milling a cylinder body connecting surface of a product reference surface and a finish-drilled product positioning hole before a transmission shaft oil seal mounting hole is milled, then adopting an online measuring function of an online machine tool to accurately find the position, and ensuring that the hole position tolerance of the transmission shaft oil seal mounting hole is 0.05-0.06.
The invention is further improved in that: the flatness of the balance shaft mounting surface is 0.05, and the surface tolerance value is 0.04; the planeness of the mounting surface of the chain cover is 0.1, the verticality is 0.15, and the surface tolerance value is 0.05; the flatness of the mounting surface of the gearbox is 0.1/100, the verticality is 0.1, and the surface tolerance value is 0.1; the tolerance value of the starter mounting surface is 0.05.
Compared with the prior art, the invention has the beneficial effects that:
the invention is used for machining the lower cylinder body of the novel three-cylinder engine, realizes the high precision requirement and high stability of the product through a more optimized process, and ensures the stable mass production and higher machining precision of the product.
Drawings
FIG. 1 is a front view of the lower cylinder of the present invention;
FIG. 2 is a schematic view of a filter mounting face of the present invention;
FIG. 3 is a schematic illustration of the oil pan mounting face of the present invention;
FIG. 4 is a schematic illustration of a transmission mounting face of the present invention;
FIG. 5 is a schematic view of the oil level sensing mounting hole of the present invention;
fig. 6 is a schematic view of the chain cover mounting surface of the present invention.
Reference numbers in the figures: 1-three-order positioning hole, 2-positioning surface, 3-cylinder body connecting surface, 4-two-order positioning hole, 5-peripheral bolt via hole, 6-oil channel hole, 7-threaded hole surface, 8-first threaded hole, 9-clapboard mounting hole, 10-lower oil pan mounting surface, 11-liquid level sensor mounting hole, 12-oil filter mounting hole, 13-threaded hole surface, 14-second threaded hole, 15-filter mounting surface, 16-product positioning hole, 17-transmission shaft oil seal mounting hole, 18-balance shaft mounting surface, 19-chain cover mounting surface, 20-gearbox mounting surface, 21-oil channel hole seal groove, 22-oil channel hole, 23-starter mounting surface and 24-starter shaft clearance hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment provides a technical scheme: a processing method of a lower cylinder body monomer of a three-cylinder engine comprises the following specific steps: clamping a lower cylinder to be machined on a machining clamp, and positioning through a three-sequence positioning hole 1 and a positioning surface 2; pre-milling a cylinder body connecting surface 3; pre-drilling and fine-drilling a second-order positioning hole 4, wherein the hole diameter of the second-order positioning hole 4 is 11.5mm, the hole diameter tolerance is 0.1, and the position tolerance is 0.15; precisely drilling each peripheral bolt through hole 5, wherein the hole diameter of each peripheral bolt through hole 5 is 11.5mm, and the aperture tolerance is 0.15; precisely drilling an oil passage hole 6, wherein the diameter of the oil passage hole 6 is 12mm, and the tolerance of the bore diameter is 0.15; milling a threaded hole surface 7; a step drill is used for drilling a first threaded hole 8 and machining an internal thread, the nominal diameter of the internal thread of the first threaded hole 8 is 10mm, the thread pitch is 1.25, and the tolerance grade is 6H; drilling a threaded bottom hole of the partition mounting hole 9 by using a stepped drill and processing an internal thread, wherein the nominal diameter of the internal thread of the partition mounting hole 9 is 6mm, the thread pitch is 1, and the tolerance grade is 6H; milling a lower oil pan mounting surface 10, and deburring the lower oil pan mounting surface 10; drilling a mounting hole of a lower oil pan and tapping internal threads, wherein the nominal diameter of the threads of the mounting hole of the lower oil pan is 6mm, the thread pitch is 1, and the tolerance grade is 6H; roughly machining and finely machining a liquid level sensor mounting hole 11, wherein the aperture of the liquid level sensor mounting hole 11 is 20.1mm, and the tolerance value is 0.015; roughly machining and finely machining an oil filter mounting hole 12, wherein the aperture of the oil filter mounting hole 12 is 31.7mm, and the tolerance value is 0.03; milling a threaded hole surface 13; a step drill is used for drilling a second threaded hole 14 and machining an internal thread, the nominal diameter of the internal thread of the second threaded hole 14 is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H; finish machining a filter mounting surface 15, drilling a filter mounting threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the internal thread of the filter mounting threaded bottom hole is 24mm, the thread pitch is 1.5, and the tolerance grade is 6H; pre-drilling and fine-drilling three-sequence positioning holes 1, wherein the hole diameter of each three-sequence positioning hole 1 is 13mm, the hole diameter tolerance is 0.1, and the position tolerance is 0.15; finely milling the cylinder body connecting surface 3, deburring the cylinder body connecting surface 3, wherein the flatness of the cylinder body connecting surface 3 is 0.05/100, and the surface profile degree is 0.15; pre-drilling and fine-drilling a product positioning hole 16, wherein the hole diameter of the product positioning hole 16 is 6mm, the aperture tolerance is 0.011, and the position tolerance is 0.15; pre-milling and finish-milling a transmission shaft oil seal mounting hole 17, wherein the diameter of the transmission shaft oil seal mounting hole 17 is 106mm, the tolerance of the aperture is 0.027, and the tolerance of the position degree is 0.05-0.06; finish milling a balance shaft mounting surface 18, wherein the flatness of the balance shaft mounting surface 18 is 0.05, and the surface tolerance value is 0.04; drilling a threaded bottom hole of a mounting hole of the balance shaft and processing an internal thread, wherein the nominal diameter of the internal thread of the mounting hole of the balance shaft is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H; pre-milling a chain cover mounting surface 19 and a gearbox mounting surface 20; drilling a threaded bottom hole of a chain cover mounting hole and machining an internal thread, wherein the nominal diameter of the internal thread of the chain cover mounting hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H; milling an oil channel hole sealing groove 21 and an oil channel hole end face, drilling an oil channel hole 22 and a threaded bottom hole of a plug mounting hole by using a step drill, and processing internal threads, wherein the hole diameter of the oil channel hole 22 is 14mm, the hole diameter is 0.1 of tolerance, the nominal diameter of the internal threads of the plug mounting hole is 18mm, the thread pitch is 1.5, and the tolerance grade is 6H; finish milling a chain cover mounting surface 19, deburring the chain cover mounting surface 19, wherein the planeness of the chain cover mounting surface 19 is 0.1, the verticality is 0.15, and the surface tolerance value is 0.05; precisely drilling an oil passage hole 22, wherein the diameter of the oil passage hole 22 is 14mm, and the aperture tolerance is 0.15; finely milling a starter mounting surface 23, wherein the tolerance value of the starter mounting surface 23 is 0.05; milling a starter shaft clearance hole 24, wherein the diameter of the starter shaft clearance hole 24 is 76mm, and the tolerance of the aperture is 0.1; finely milling a gearbox mounting surface 20, removing burrs from the gearbox mounting surface 20, wherein the flatness of the gearbox mounting surface 20 is 0.1/100, the verticality is 0.1, and the surface tolerance value is 0.1; drilling a bolt through hole on the mounting surface of the gearbox, wherein the hole diameter of the bolt through hole on the mounting surface of the gearbox is 11.5mm, and the aperture tolerance is 0.15; and drilling a threaded bottom hole of the gearbox mounting hole and processing an internal thread, wherein the nominal diameter of the internal thread of the gearbox mounting hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H.
The cylinder body connecting surface 3 of a product reference surface and a precision drilling product positioning hole 16 are precisely milled before pre-milling and finish milling of a transmission shaft oil seal mounting hole 17, and then the position is accurately found by adopting the online measurement function of an online machine tool, so that the hole position tolerance of the transmission shaft oil seal mounting hole 17 is ensured to be 0.05; the cylinder body connecting surface 3 and the product positioning hole 16 which adopt the product reference surface are processed in the same sequence, and the position tolerance of 0.06 hole of the transmission shaft oil seal mounting hole 17 is ensured. Meanwhile, the constant temperature cutting fluid is added to the processing machine tool, so that the temperature of the product is ensured to be constant.
The cylinder body connecting surface 3 and the product positioning hole 16 which adopt the product reference surface are processed in the same sequence, and the flatness of the balance shaft mounting surface 18 is ensured to be 0.05, and the surface tolerance value is 0.04. The cylinder body connecting surface 3 of the product reference surface and the product positioning hole 16 are used as processing and positioning references, so that the flatness of the chain cover mounting surface 19 is ensured to be 0.1, the verticality is 0.15, and the surface tolerance value is 0.05; ensuring that the flatness of the gearbox mounting surface 20 is 0.1/100, the verticality is 0.1 and the surface tolerance value is 0.1; the tolerance value of the starter mounting surface 23 is ensured to be 0.05. Meanwhile, the constant temperature cutting fluid is added to the processing machine tool, so that the temperature of the product is ensured to be constant.
The invention is used for machining the lower cylinder body of the novel three-cylinder engine, realizes the high precision requirement and high stability of the product through a more optimized process, and ensures the stable mass production and higher machining precision of the product.
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 according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements 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 … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship 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 of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (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 only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A processing method of a lower cylinder body monomer of a three-cylinder engine is characterized by comprising the following steps: the method comprises the following specific steps:
A. clamping a lower cylinder to be machined on a machining clamp, and positioning through a three-sequence positioning hole (1) and a positioning surface (2);
B. pre-milling a cylinder body connecting surface (3); pre-drilling and fine-drilling a two-sequence positioning hole (4), wherein the hole diameter of the two-sequence positioning hole (4) is 11.5mm, the hole diameter tolerance is 0.1, and the position tolerance is 0.15;
C. precisely drilling each peripheral bolt through hole (5), wherein the hole diameter of each peripheral bolt through hole (5) is 11.5mm, and the aperture tolerance is 0.15; precisely drilling an oil passage hole (6), wherein the diameter of the oil passage hole (6) is 12mm, and the tolerance of the hole diameter is 0.15;
D. milling a threaded hole surface (7); drilling a first threaded hole (8) by using a step drill and machining an internal thread, wherein the nominal diameter of the internal thread of the first threaded hole (8) is 10mm, the thread pitch is 1.25, and the tolerance grade is 6H; drilling a threaded bottom hole of a partition plate mounting hole (9) by using a stepped drill and processing an internal thread, wherein the nominal diameter of the internal thread of the partition plate mounting hole (9) is 6mm, the thread pitch is 1, and the tolerance grade is 6H;
E. milling a lower oil pan mounting surface (10), and deburring the lower oil pan mounting surface (10); drilling a mounting hole of a lower oil pan and tapping internal threads, wherein the nominal diameter of the threads of the mounting hole of the lower oil pan is 6mm, the thread pitch is 1, and the tolerance grade is 6H;
F. roughly machining and finely machining a liquid level sensor mounting hole (11), wherein the hole diameter of the liquid level sensor mounting hole (11) is 20.1mm, and the tolerance value is 0.015; roughly machining and finely machining an oil filter mounting hole (12), wherein the aperture of the oil filter mounting hole (12) is 31.7mm, and the tolerance value is 0.03;
G. milling a threaded hole surface (13); a step drill is used for drilling a second threaded hole (14) and machining an internal thread, the nominal diameter of the internal thread of the second threaded hole (14) is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H; finish machining a filter mounting surface (15), drilling a filter mounting threaded bottom hole and tapping an internal thread, wherein the nominal diameter of the internal thread of the filter mounting threaded bottom hole is 24mm, the thread pitch is 1.5, and the tolerance grade is 6H;
H. pre-drilling and fine-drilling the three-sequence positioning holes (1), wherein the hole diameter of each three-sequence positioning hole (1) is 13mm, the hole diameter tolerance is 0.1, and the position tolerance is 0.15;
I. finely milling the cylinder body connecting surface (3), deburring the cylinder body connecting surface (3), wherein the flatness of the cylinder body connecting surface (3) is 0.05/100, and the surface profile degree is 0.15;
J. pre-drilling and fine-drilling a product positioning hole (16), wherein the diameter of the product positioning hole (16) is 6mm, the tolerance of the aperture is 0.011, and the tolerance of the position degree is 0.15;
K. pre-milling and finish-milling a transmission shaft oil seal mounting hole (17), wherein the diameter of the transmission shaft oil seal mounting hole (17) is 106mm, the tolerance of the aperture is 0.027, and the tolerance of the position degree is 0.05;
l, finish milling a balance shaft mounting surface (18), wherein the flatness of the balance shaft mounting surface (18) is 0.05, and the surface tolerance value is 0.04; drilling a threaded bottom hole of a mounting hole of a balance shaft and processing an internal thread, wherein the nominal diameter of the internal thread of the mounting hole of the balance shaft is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H;
m, pre-milling a chain cover mounting surface (19) and a gearbox mounting surface (20); drilling a threaded bottom hole of a chain cover mounting hole and machining an internal thread, wherein the nominal diameter of the internal thread of the chain cover mounting hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H;
n, milling an oil channel hole sealing groove (21), milling an end face of an oil channel hole, drilling a threaded bottom hole of the oil channel hole (22) and a plug mounting hole by a step drill and processing internal threads, wherein the hole diameter of the oil channel hole (22) is 14mm, the hole diameter is 0.1 of tolerance, the nominal diameter of the internal threads of the plug mounting hole is 18mm, the thread pitch is 1.5, and the tolerance grade is 6H;
o, finely milling a chain cover mounting surface (19), deburring the chain cover mounting surface (19), wherein the planeness of the chain cover mounting surface (19) is 0.1, the verticality is 0.15, and the surface tolerance value is 0.05; precisely drilling an oil passage hole (22), wherein the diameter of the oil passage hole (22) is 14mm, and the aperture tolerance is 0.15;
p, finely milling a starter mounting surface (23), wherein the tolerance value of the starter mounting surface (23) is 0.05; milling a starter shaft clearance hole (24), wherein the diameter of the starter shaft clearance hole (24) is 76mm, and the tolerance of the aperture is 0.1;
q, finely milling a gearbox mounting surface (20), removing burrs from the gearbox mounting surface (20), wherein the flatness of the gearbox mounting surface (20) is 0.1/100, the verticality is 0.1, and the surface tolerance value is 0.1; drilling a bolt through hole on the mounting surface of the gearbox, wherein the hole diameter of the bolt through hole on the mounting surface of the gearbox is 11.5mm, and the aperture tolerance is 0.15; and drilling a threaded bottom hole of the gearbox mounting hole and processing an internal thread, wherein the nominal diameter of the internal thread of the gearbox mounting hole is 8mm, the thread pitch is 1.25, and the tolerance grade is 6H.
2. The method for processing the lower cylinder body monomer of the three-cylinder engine according to claim 1, wherein the method comprises the following steps: the cylinder body connecting surface (3) of the product reference surface and a precision drilling product positioning hole (16) are precisely milled before the transmission shaft oil seal mounting hole (17) is pre-milled and precisely milled, and then the position is accurately found by adopting the online measurement function of an online machine tool, so that the hole position tolerance of the transmission shaft oil seal mounting hole (17) is ensured to be 0.05-0.06.
3. The method for processing the lower cylinder body monomer of the three-cylinder engine according to claim 1, wherein the method comprises the following steps: the flatness of the balance shaft mounting surface (18) is 0.05, and the surface tolerance value is 0.04; the flatness of the chain cover mounting surface (19) is 0.1, the verticality is 0.15, and the surface tolerance value is 0.05; the flatness of the gearbox mounting surface (20) is 0.1/100, the verticality is 0.1, and the surface tolerance value is 0.1; the tolerance value of the starter mounting surface (23) is 0.05.
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| CN113404616A (en) * | 2021-06-30 | 2021-09-17 | 湛江德利车辆部件有限公司 | Front housing and processing method thereof |
| CN114799770A (en) * | 2022-05-27 | 2022-07-29 | 广东鸿图南通压铸有限公司 | Machining process of die-casting aluminum alloy speed reducer shell |
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