CN105252512A - Lineation method for inner cavity of machine base blank of large single-cylinder diesel engine - Google Patents
Lineation method for inner cavity of machine base blank of large single-cylinder diesel engine Download PDFInfo
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- CN105252512A CN105252512A CN201510724519.9A CN201510724519A CN105252512A CN 105252512 A CN105252512 A CN 105252512A CN 201510724519 A CN201510724519 A CN 201510724519A CN 105252512 A CN105252512 A CN 105252512A
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- 238000009826 distribution Methods 0.000 claims description 14
- 238000007796 conventional method Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 7
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- 238000003754 machining Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 241000209094 Oryza Species 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011022 operating instruction Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H7/00—Marking-out or setting-out work
- B25H7/04—Devices, e.g. scribers, for marking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
- B25H7/00—Marking-out or setting-out work
- B25H7/04—Devices, e.g. scribers, for marking
- B25H7/045—Devices, e.g. scribers, for marking characterised by constructional details of the marking elements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention discloses a lineation method for an inner cavity of a machine base blank of a large single-cylinder diesel engine. A set of main bearing holes and four sets of gear holes are formed in the inner cavity of the machine base blank. The center axes of the four sets of gear holes are parallel to the center axes of the main bearing holes. The center axes of the four sets of gear holes are symmetrically distributed in an isosceles trapezoid manner along the longitudinal space. The lineation method is characterized in that on the premise that the machining allowance is guaranteed, the three-dimensional space three-dimensional inner cavity lineation task is finished based on the three-dimensional space operation of the inner cavity isosceles trapezoid and the operation of the two lineation positions and the deviation auxiliary line of the center axes of the main bearing holes, the center axes, meeting the requirement, of the main bearing holes and the four sets of gear holes, hole circle machining lines, meeting the requirement, of the main bearing holes and gear holes, and the appearance outline machining line, meeting the requirement, of a machine base are lined out, and a machine tool program is instructed to machine the gear holes and the main bearing holes. According to the lineation method, the production cost is reduced, and the safety and quality accidents are avoided. The lineation method has the beneficial effects of being easy and convenient to operate and high in lineation precision and is suitable for lineation operation of the inner cavity of the machine base blank of the single-cylinder diesel engine and inner cavities of similar components.
Description
Technical field
The present invention relates to the method for manufacturing technology of large-scale diesel engine parts, be specifically related to a kind of machine tooling program that can instruct at the scribble method for large-scale single cylinder diesel support blank inner chamber of Mega-boule inner cavity of component operating instruction track, belong to diesel engine manufacturing technology field.
Background technology
Support is the strength member in single cylinder large-scale diesel engine, and the main feature of its structure is inner chamber.Refer to the stereogram of Fig. 1 single cylinder diesel support, one group of main bearing hole and four groups of gear holes are provided with in the inner chamber of described single cylinder diesel support, described one group of main bearing hole is positioned at the middle part of described support, at least two of distribution coaxial main bearing holes before and after comprising, described four groups of gear holes are positioned at the bottom of described support, at least two coaxial gear holes of distribution before and after each group gear hole comprises, the central axis of these four groups of gear holes all with the centerline axis parallel of described one group of main bearing hole, naturally be also parallel to each other, and the longitudinally space symmetr ground distribution (see Fig. 7) in isosceles trapezoid of the central axis of these four groups of gear holes.With the central axis of described one group of main bearing hole and four groups of gear holes, the appearance profile of the support after machining must ensure that integral central is symmetrical, the central axis of these four groups of gear holes ensures as three-dimensional isosceles trapezoid spatial distribution, and each main bearing hole of described one group of main bearing hole reaches axiality requirement, each gear hole of each group gear hole reaches axiality requirement.
In prior art, traditional scribble method is in three scribing position, is completed the line of described single cylinder diesel support blank inner chamber by two-dimentional scratch form.But conventional method is not only loaded down with trivial details but also time-consuming, cost is high, poor stability, and the line degree of accuracy is also low.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of scribble method for large-scale single cylinder diesel support blank inner chamber is provided, combine with existing ruling, three-dimensional line task is completed by two-dimentional scratch form, two scribing position realize the three-dimensional scribing operation of single cylinder diesel support intracavity space, mark the gear hole central axis of tutorial program establishment instruction track, and in inner chamber line, machine tool program track is replaced to check single cylinder engine support blank with scribing inspection, thus under the prerequisite ensureing technology acuracy, reach reduction production cost, avoid the effect of safety and quality accident.
In order to reach foregoing invention object, the technical scheme that the present invention takes is as follows:
A kind of scribble method for large-scale single cylinder diesel support blank inner chamber, there are in the inner chamber of this support blank the one group of main bearing hole being positioned at middle part and the four groups of gear holes being positioned at bottom, at least two coaxial main bearing holes of distribution before and after described one group of main bearing hole comprises, at least two coaxial gear holes of distribution before and after each group gear hole comprises, the central axis of described four groups of gear holes and the central axis of described one group of main bearing hole are parallel to each other, and the longitudinally space symmetr ground distribution in isosceles trapezoid of the central axis of these four groups of gear holes; It is characterized in that: under the prerequisite ensureing allowance, operate based on inner chamber isosceles trapezoid solid space, horizontal table passes through the operation of the biased boost line of two scribing position and main bearing hole central axis, complete three dimensions three-dimensional inner chamber line task, mark the hole circle processing line of the central axis of the described one group of main bearing hole met the demands, the central axis of four groups of gear holes, each main bearing hole and gear hole, support appearance profile processing line, to instruct machine tool program to the processing of each described gear hole and main bearing hole.
Further, described scribble method comprises following concrete steps:
1) with the prone erection position, one end of described support blank, by jack, this support blank is supported on horizontal table, as the first scribing position;
2) by the lifting of the described jack of adjustment, correct described end face and reach parallel with described horizontal table, the line of centres of each gear hole correcting each group gear hole reaches vertical with described horizontal table with the line of centres of each main bearing hole of one group of main bearing hole, to ensure the accurate of line;
3) with described end face for benchmark, mark the end face processing line of each described main bearing hole, the end face processing line of each described gear hole and the end profile processing line of described support blank;
4) use hanging instrument on the diameter die joint of described main bearing hole, delimit the biased boost line of the main bearing hole central axis perpendicular to described horizontal table, boost line is adjusted in the school using the side place of hanging instrument near the upper plane of described support blank to mark perpendicular to described horizontal table;
5) with the upper flat prone upside down position of described support blank, by jack, this support blank is supported on described horizontal table, and it is parallel with this horizontal table to use scribing block to correct described boost line, as the second scribing position;
6) center of described main bearing hole is found out on the end surface by conventional method, the main bearing hole X of horizontal table is parallel to center line by the center delimitation of this main bearing hole, then with this main bearing hole X to center line for benchmark, mark the upper face profile processing line of described support blank, and mark this main bearing hole X to center line to described four groups of gear hole X to the distance size mark dotted line of center line at the two side faces of described support blank, use stringing method, in the inner chamber of support blank, use ruler to connect this dotted line, mark the X of described four groups of gear holes to center line,
7) use hanging instrument to be delimited the Y-direction center line of this main bearing hole on the end surface by described main bearing hole center, and mark the hole circle processing line of this main bearing hole; Carry out biased boost line operation: measure the Y-direction center line of described main bearing hole and the distance of described biased boost line, then on the other end of described support blank to extend to the biased boost line of this other end for benchmark, to measuring back same described distance more in the other direction, thus make the main bearing hole center of other end, connect the main bearing hole center in both ends of the surface, be the central axis of described one group of main bearing hole; Use hanging instrument to delimit the Y-direction center line of main bearing hole on described other end, and mark the hole circle processing line of this main bearing hole; Check the front and back concentricity situation of each gear hole of described four groups of gear holes, determining correctly, formal central axis of delimiting described one group of main bearing hole, moves towards to instruct machine tooling program running orbit;
8) with the Y-direction center line of the main bearing hole in the central axis of described one group of main bearing hole and both ends of the surface for benchmark, by the X of described four groups of gear holes centered by the intersection point of the Y-direction center line of the main bearing hole on center line and both ends of the surface, mark the central point of described four groups of gear holes totally eight described gear holes on face, rear and front end respectively, connect the central point of these eight described gear holes, realize the operation of inner chamber isosceles trapezoid solid space.
Further, described step 1) and step 5) in, the Support Position of described jack to the distance at the two ends of described support blank meet following guarantee to cause because of deadweight be deformed into minimum condition:
A=0.207L, wherein, a is the distance of jack to support blank end face, and L is the width of support blank.
Further, the platform of described horizontal table to be flatness error be 0.2mm/10 rice.
Compared with prior art, the present invention has following beneficial effect:
The present invention is compared with existing ruling, use conventional scoring tool, adopt the biased boost line technology of main bearing hole central axis, two scribing position achieve the three-dimensional isosceles trapezoid space scribing operation of single cylinder diesel support blank inner chamber, in scratching process at support inner chamber to main bearing hole, gear hole carries out blank shape dimensional gaughing and axiality inspection, avoid machine tool program and check the quality accident that the complex operations of part causes, thus when this blank part of machine tooling, blank quality need not be checked again at inner cavity of component, can directly with guide lines such as marked main bearing hole central axis and gear hole central axis for benchmark, instruction after performing a programme establishment, and ensure that the running orbit of processing Program instruction in support inner chamber is correct.The present invention is under the prerequisite ensureing allowance, reach the effect reducing production cost, avoid safety and quality accident, there is easy and simple to handle, that line precision is high advantage, the inner chamber scribing operation of single cylinder diesel support blank and similar parts can be applicable to.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of single cylinder diesel support blank.
Fig. 2 is method flow schematic diagram of the present invention.
Fig. 3 is the first scribing position schematic diagram of the present invention.
Fig. 4 is the side view of Fig. 3.
Fig. 5 is jack Support Position schematic diagram.
Fig. 6 is the second scribing position schematic diagram of the present invention.
Fig. 7 is step schematic diagram of the present invention.
Fig. 8 is the schematic diagram of inner chamber isosceles trapezoid solid space operation.
Detailed description of the invention
The key that the present invention solves its technical problem is, how in the stand up position of the support blank of described single cylinder diesel, realize biased boost line to locate the precision of main bearing hole central axis, under the prerequisite ensureing blank allowance, by the use of biased boost line, make each described main bearing hole reach front and back concentric, mark the machine tool program processing line track of the isosceles trapezoid of described each gear hole and the position line of datum end face at inner chamber.
The present invention is a kind of scribble method of the support blank inner chamber for large-scale single cylinder diesel, refer to Fig. 1, there are in the inner chamber of the support blank 1 of described single cylinder diesel the one group of main bearing hole 11 be positioned in the middle part of this support blank 1 and the four groups of gear holes 12 being positioned at this support blank 1 bottom, at least two coaxial main bearing holes of distribution before and after described one group of main bearing hole 11 comprises, each main bearing hole has diameter die joint (Hough face), at least two coaxial gear holes of distribution before and after each group gear hole 12 comprises, the central axis of described four groups of gear holes 12 and the central axis of described one group of main bearing hole 11 are parallel to each other, and the longitudinally space symmetr ground distribution (see Fig. 7) in isosceles trapezoid of the central axis of these four groups of gear holes 12, it is characterized in that: under the prerequisite ensureing allowance, operate based on inner chamber isosceles trapezoid solid space, horizontal table 2 is operated by the biased boost line of two scribing position of described support blank 1 and main bearing hole central axis, complete three dimensions three-dimensional inner chamber line task, mark the central axis of the one group of main bearing hole 11 meeting the described support blank 1 that design size requires, the central axis of four groups of gear holes 12 in inner chamber, the hole circle processing line of each main bearing hole and gear hole, support appearance profile processing line and biased boost line, and extend the both ends of the surface of this biased boost line to described support blank 1, to instruct machine tool program to the processing of each described gear hole and main bearing hole.
Below in conjunction with accompanying drawing and specific embodiment, the present invention is further elaborated, but can not limits the scope of the invention with this.
Described scribble method comprises following concrete steps, refers to Fig. 2:
1) on described horizontal table 2, see Fig. 3, downward with an end face A more smooth in the face, rear and front end of the support blank 1 of described large-scale single cylinder diesel, support this support blank 1 by jack 3, described support blank 1 is made to be in the position of setting, as the first scribing position; Described horizontal table 2 for flatness error be the platform of 0.2mm/10 rice.
The Support Position of described jack 3 meets following condition to the distance of these support blank 1 both sides:
A=0.207L, wherein, a is the distance of jack 3 to support blank 1 side, and L is the width of support blank 1.
When the conditions are satisfied, minimum by being deformed into of causing because of deadweight of the support blank 1 supported, thus after ensureing that the support blank 1 after line moves to machining tool workbench, the recovery of its distortion can not affect the precision of line.Principle is as follows:
Refer to Fig. 5, jack 3 is supported on T1 point and the T2 point of line workpiece symmetrically, T1 point and T2 point are a with the distance of line workpiece two sides respectively, the length of line workpiece is L, its deadweight q acts on the mid point E place of the 1/2L of line workpiece, then the Bending moment distribution that the q that conducts oneself with dignity produces in integral marking workpiece as shown in the figure.From mechanics principle, when | during ME ︱=︱ MD ︱=︱ MF ︱, the maximum deformation quantity of integral marking workpiece is minimum under gravity.
And
So,
Finally,
2) by the lifting of adjustment jack 3, correct the larger non-machined surface such as described end face A and gear hole end face, main bearing hole end face, gripper shoe with scribing block 4 and reach substantially parallel with horizontal table 2, the line of centres of each gear hole correcting each group gear hole 12 with hanging instrument in the lumen reaches substantially vertical with horizontal table 2 with the line of centres of each main bearing hole of one group of main bearing hole 11, avoid unsplit frame blank 1 to be in twisted state, thus ensure the accurate of line.
3) conventional method is passed through, with described end face A for benchmark, use scribing block 4 to mark the common centreline b of the end face processing line of each described main bearing hole, the end face processing line of each described gear hole, the end profile processing line of described support blank 1 and described support blank 1, see Fig. 3.
4) by conventional method, use the more smooth place delimitation of hanging instrument on the diameter die joint (Hough face) of described main bearing hole perpendicular to the biased boost line d of the main bearing hole central axis of horizontal table 2; Please refer to Fig. 4 again, by conventional method, boost line F is adjusted in the school using the side place of hanging instrument near the upper plane of described support blank 1 to mark perpendicular to horizontal table 2.
5) on described horizontal table 2, see Fig. 6, downward with the upper plane of described support blank 1, this support blank 1 is supported by jack 3, described support blank 1 is made to be in inverted position, and it is parallel with horizontal table 2 to use scribing block 4 to correct described boost line F, thus described support blank 1 is up to the standard, as the second scribing position; With step 1) identical, the Support Position of described jack 3 still meets following condition to the distance of these support blank 1 both sides: a=0.207L, and wherein, a is the distance of jack 3 to support blank 1 side, and L is the width of support blank 1.
6) conventional method is passed through, described end face A finds out the center O of described main bearing hole, scribing block 4 delimitation is used to be parallel to the main bearing hole X of horizontal table 2 to center line OX by the center O of this main bearing hole, then with this main bearing hole X to center line OX for benchmark, mark the upper face profile processing line of described support blank 1, and the two side faces of described support blank 1 mark this main bearing hole X to center line OX to inner chamber described in four groups of gear hole X to the distance size mark dotted line of center line, use stringing method, with this dotted line for benchmark, in the inner chamber of support blank 1, use ruler to connect dotted line, mark the X of described four groups of gear holes to center line.
7) on the end face A of described support blank 1, use hanging instrument to delimit the Y-direction center line OY of main bearing hole by described main bearing hole center O point, see Fig. 6, and use compasses to mark the hole circle processing line of this main bearing hole; Refer to Fig. 8, measure the Y-direction center line OY of described main bearing hole and the distance g of described biased boost line d, then on the other end of described support blank 1 to extend to the biased boost line d of this other end for benchmark, to measuring back same distance g more in the other direction, thus make the main bearing hole center O ' of other end, connect the main bearing hole center O ' of described main bearing hole center O and other end, OO ' is the central axis of described one group of main bearing hole 11, and aforesaid operations process is described biased boost line operation.Use hanging instrument to be delimited the Y-direction center line O ' Y ' of main bearing hole on other end by described main bearing hole center O ', and use compasses to mark the hole circle processing line of this main bearing hole.Adopt the Y-direction center line O ' Y ' of main bearing hole on the Y-direction center line OY of described main bearing hole, the central axis OO ' of described one group of main bearing hole 11 and other end, check the blank situation of described four groups of gear holes 12 and the front and back concentricity situation of each gear hole thereof, determining correctly, the central axis OO ' of the described one group of main bearing hole 11 of formal delimitation, moves towards to instruct machine tooling program running orbit.
8) with the central axis OO ' of described one group of main bearing hole, on the Y-direction center line OY of described main bearing hole and other end, the Y-direction center line O ' Y ' of main bearing hole is benchmark, incorporated by reference to consulting Fig. 7 and Fig. 8, the Y-direction center line OY of the described main bearing hole on described end face A is made to become the size datum center of each described gear hole on end face A, the Y-direction center line O ' Y ' of main bearing hole on other end is made to become the size datum center of each described main bearing hole on other end, namely by the X of described four groups of gear holes 12 centered by the intersection point of the Y-direction center line O ' Y ' of main bearing hole on the Y-direction center line OY and other end of center line and described main bearing hole, compasses are used to mark the central point N1 of described four groups of gear holes 12 totally eight described gear holes on face, rear and front end respectively, N2, N5, N6 and N3, N4, N7, N8, connect eight central point N1 of described gear hole, N2, N6, N5, N3, N4, N8 and N7, be the operation of inner chamber isosceles trapezoid solid space.
Above are only preferred embodiment of the present invention, all equivalences done according to the present patent application content change and modify, and all should become the protection domain of patent of the present invention.
The present invention can be used for carrying out scribing operation to the support blank of large-scale single cylinder diesel or the inner chamber of similar blank part, reaches best processing effect.The present invention's instrument used is simple, with low cost, coordinates with machine tool program, and guide machining locus, can process the support of high-precision single cylinder diesel.
Claims (4)
1. the scribble method for large-scale single cylinder diesel support blank inner chamber, there are in the inner chamber of this support blank the one group of main bearing hole being positioned at middle part and the four groups of gear holes being positioned at bottom, at least two coaxial main bearing holes of distribution before and after described one group of main bearing hole comprises, at least two coaxial gear holes of distribution before and after each group gear hole comprises, the central axis of described four groups of gear holes and the central axis of described one group of main bearing hole are parallel to each other, and the longitudinally space symmetr ground distribution in isosceles trapezoid of the central axis of these four groups of gear holes; It is characterized in that: under the prerequisite ensureing allowance, operate based on inner chamber isosceles trapezoid solid space, horizontal table passes through the operation of the biased boost line of two scribing position and main bearing hole central axis, complete three dimensions three-dimensional inner chamber line task, mark the hole circle processing line of the central axis of the described one group of main bearing hole met the demands, the central axis of four groups of gear holes, each main bearing hole and gear hole, support appearance profile processing line, to instruct machine tool program to the processing of each described gear hole and main bearing hole.
2. the scribble method for large-scale single cylinder diesel support blank inner chamber according to claim 1, is characterized in that: described scribble method comprises following concrete steps:
1) with the prone erection position, one end of described support blank, by jack, this support blank is supported on horizontal table, as the first scribing position;
2) by the lifting of the described jack of adjustment, correct described end face and reach parallel with described horizontal table, the line of centres of each gear hole correcting each group gear hole reaches vertical with described horizontal table with the line of centres of each main bearing hole of one group of main bearing hole, to ensure the accurate of line;
3) with described end face for benchmark, mark the end face processing line of each described main bearing hole, the end face processing line of each described gear hole and the end profile processing line of described support blank;
4) use hanging instrument on the diameter die joint of described main bearing hole, delimit the biased boost line of the main bearing hole central axis perpendicular to described horizontal table, boost line is adjusted in the school using the side place of hanging instrument near the upper plane of described support blank to mark perpendicular to described horizontal table;
5) with the upper flat prone upside down position of described support blank, by jack, this support blank is supported on described horizontal table, and it is parallel with this horizontal table to use scribing block to correct described boost line, as the second scribing position;
6) center of described main bearing hole is found out on the end surface by conventional method, the main bearing hole X of horizontal table is parallel to center line by the center delimitation of this main bearing hole, then with this main bearing hole X to center line for benchmark, mark the upper face profile processing line of described support blank, and mark this main bearing hole X to center line to described four groups of gear hole X to the distance size mark dotted line of center line at the two side faces of described support blank, use stringing method, in the inner chamber of support blank, use ruler to connect this dotted line, mark the X of described four groups of gear holes to center line,
7) use hanging instrument to be delimited the Y-direction center line of this main bearing hole on the end surface by described main bearing hole center, and mark the hole circle processing line of this main bearing hole; Carry out biased boost line operation: measure the Y-direction center line of described main bearing hole and the distance of described biased boost line, then on the other end of described support blank to extend to the biased boost line of this other end for benchmark, to measuring back same described distance more in the other direction, thus make the main bearing hole center of other end, connect the main bearing hole center in both ends of the surface, be the central axis of described one group of main bearing hole; Use hanging instrument to delimit the Y-direction center line of main bearing hole on described other end, and mark the hole circle processing line of this main bearing hole; Check the front and back concentricity situation of each gear hole of described four groups of gear holes, determining correctly, formal central axis of delimiting described one group of main bearing hole, moves towards to instruct machine tooling program running orbit;
8) with the Y-direction center line of the main bearing hole in the central axis of described one group of main bearing hole and both ends of the surface for benchmark, by the X of described four groups of gear holes centered by the intersection point of the Y-direction center line of the main bearing hole on center line and both ends of the surface, mark the central point of described four groups of gear holes totally eight described gear holes on face, rear and front end respectively, connect the central point of these eight described gear holes, realize the operation of inner chamber isosceles trapezoid solid space.
3. the scribble method for large-scale single cylinder diesel support blank inner chamber according to claim 2, it is characterized in that: described step 1) and step 5) in, the Support Position of described jack to the distance at the two ends of described support blank meet following guarantee to cause because of deadweight be deformed into minimum condition:
A=0.207L, wherein, a is the distance of jack to support blank end face, and L is the width of support blank.
4. the scribble method for large-scale single cylinder diesel support blank inner chamber according to claim 1, is characterized in that: the platform of described horizontal table to be flatness error be 0.2mm/10 rice.
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| CN201510724519.9A CN105252512B (en) | 2015-10-30 | 2015-10-30 | Lineation method for inner cavity of machine base blank of large single-cylinder diesel engine |
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| CN201510724519.9A CN105252512B (en) | 2015-10-30 | 2015-10-30 | Lineation method for inner cavity of machine base blank of large single-cylinder diesel engine |
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| CN112254644A (en) * | 2020-11-10 | 2021-01-22 | 宁波日星铸业有限公司 | Allowance inspection and marking tool for fan hub blank and using method |
| CN116147553A (en) * | 2023-03-16 | 2023-05-23 | 中国第一汽车股份有限公司 | A detection and evaluation method for cylinder bore position degree of engine block blank |
| CN116690522A (en) * | 2023-07-12 | 2023-09-05 | 上海中船三井造船柴油机有限公司 | Laser scribing tool and method for marine diesel engine base |
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| CN105252512B (en) | 2017-01-18 |
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