CN102848140B - Machining method for engine chassis of small excavator - Google Patents
Machining method for engine chassis of small excavator Download PDFInfo
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- CN102848140B CN102848140B CN201210272106.8A CN201210272106A CN102848140B CN 102848140 B CN102848140 B CN 102848140B CN 201210272106 A CN201210272106 A CN 201210272106A CN 102848140 B CN102848140 B CN 102848140B
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Abstract
The invention discloses a machining method for an engine chassis of a small excavator. The machining method is characterized by comprising the following steps of: 1. assembling and welding parts on the chassis together through a fixture; 2. clamping the chassis which is firmly welded onto a GR510 numerical control machine tool, and integrally milling the surfaces of two first supports and two second supports so that the surfaces of the first supports and the second supports are all kept at the same plane; 3. when the milling is finished, keeping the chassis in the original clamping position, respectively drilling engine mounting holes on the first supports and on the second supports, and during drilling, setting a tool by a drill jib so as to ensure that the mounting holes on the chassis are matched with the position and size of corresponding holes on the engine; and 4. respectively arranging mounting holes on a fourth plate, a first steel angle and a boundary beam, wherein the mounting holes are matched with the position and size of corresponding holes on the engine. The machining method for the engine chassis of the small excavator disclosed by the invention has the characteristics of high machining precision, high strength of the engine chassis, short machining time, etc.
Description
Technical field
The present invention relates to a kind of processing method of engine underframe of mini-excavator, belong to engine underframe manufacture field.
Background technology
In excavator and other construction machinery production fields, engine is the power set of excavator and other engineering machinery, it is the kernel component of whole machine, therefore the installation accuracy of type selecting, fixed position and fixed form, the especially engine of engine etc. directly affects engine even serviceability and service life of excavator complete machine.In small-sized excavator, engine generally can first be fixed on engine underframe, and then is fixed on the platform of excavator again, and the machining accuracy of engine underframe will directly have influence on the installation accuracy of engine so.In design in the past, engine can directly be fixed on the engine bearer of Platform of Excavators conventionally, and because platform by volume is comparatively huge and structure is comparatively complicated, machining accuracy is difficult to ensure card, thereby has affected the installation accuracy of engine.By improving, first engine had been installed on engine underframe afterwards, but the processing of engine underframe generally adopts the front processing of weldering, and then group, to welding, is difficult to guarantee its precision so too.
Summary of the invention
The object of the invention is to solve the problem such as the machining accuracy of engine underframe is poor, the processing method of the engine underframe of the mini-excavator that a kind of machining accuracy is high, the intensity of engine underframe is high, process time is short is provided.
In order to achieve the above object, the invention provides a kind of processing method of engine underframe of mini-excavator, it is characterized in that, comprise the following steps:
Step 1: each parts on underframe are arrived together by frock welding;
Step 2: the underframe of firm welding is clamped on GR510 Digit Control Machine Tool, whole milling is carried out in the surface of two bearings one and two bearings two, bearing one and bearing two plane above are all kept at grade;
Step 3: after milling, underframe still keeps original clamping position, and the installing hole of drilling engine on bearing one and bearing two, during boring, utilize drill jig to carry out tool setting drilling, guaranteed that the position size of corresponding aperture on installing hole on underframe and engine matches;
Step 4: plate four, angle steel one and side bar are offered to installing hole, and on this installing hole and engine, the position size of corresponding aperture matches.
Preferably, described step 1 is specially: plate one is connected with plate four, the two ends of plate four are connected with one end of angle steel one and one end of side bar respectively, the other end of angle steel one is all connected with the two ends of plate three with the other end of side bar, one side of plate three is provided with plate two, between angle steel one and side bar, be provided with angle steel two, angle steel one is equipped with bearing two with the centre position of side bar inner side, and one end of angle steel one and one end of side bar are equipped with bearing one near the position of plate four.
Preferably, described bearing one is identical with the structure of bearing two, includes plectane, the bending plate below plectane and plectane welding, and the center of plectane and bending plate is penetrated with an installing hole.
The utility model provides a kind of processing method of engine underframe of mini-excavator, this processing method adopts postwelding processing, machining accuracy is greatly improved, and the intensity of engine underframe is also improved, and the vibrations of engine are effectively improved.The engine underframe processing by the present invention, four bearings at configuration aspects engine also weld from three original plate overlap joints, be replaced into the structure of welding plectane on bending plate, so not only make the intensity of bearing be improved, by reducing weld seam, reduce the possibility of concentrating of welding deformation and stress and bearing fracture, and shortened process time, group to time precision more easily hold.Finally cause the installation accuracy of engine to be improved, underframe anti-seismic performance is improved.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of engine underframe of mini-excavator;
Fig. 2 is the structural representation of bearing one.
Description of reference numerals
1 is that plate one, 2 is that angle steel one, 3 is that bearing one, 4 is that bearing two, 5 is that plate two, 6 is that plate three, 7 is that plate four, 8 is side bar, and 9 is that angle steel two, 10 is installing hole, and 11 is plectane, and 12 is bending plate.
The specific embodiment
For the present invention is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.
Embodiment 1
By a series of design and processes process modifications, become the engine underframe often adopting now, it is a structural member being formed by a plurality of parts weldings, as shown in Figure 1, is a kind of structural representation of engine underframe of mini-excavator.Plate 1 is connected with plate 47, the two ends of plate 47 are connected with one end of side bar 8 with one end of angle steel 1 respectively, the other end of the other end of angle steel 1 and side bar 8 is all connected with the two ends of plate 36, one side of plate 36 is provided with plate 25, between angle steel 1 and side bar 8, be provided with angle steel 29, angle steel 1 is equipped with bearing 24 with the centre position of side bar 8 inner sides, and one end of one end of angle steel 1 and side bar 8 is equipped with bearing 1 near the position of plate 47.
Pass through verification experimental verification, the mini-excavator engine underframe of this method design and processing is owing to adopting postwelding processing, machining accuracy is greatly improved, and by measuring the shock conditions of engine bearer, find that the intensity of engine underframe is also improved, the vibrations of engine are effectively improved.In addition, because radiator is also contained on underframe simultaneously, this has also well guaranteed that, on same straight line, there is the effect of killing two birds with one stone at the center of radiator and the center of engine flywheel.By underframe, radiator and engine are linked together like this, not only can improve assembly precision, and easy to assembly, improved productivity ratio.
According to the structure of above this engine underframe, there is a kind of processing method of engine underframe of mini-excavator of reasonable uniqueness, by machining, guarantee the precision of whole underframe.The method comprises the following steps:
Step 1: by each parts on underframe by frock welding to together, bearing is equally according to relative size position, utilize group to frock be located, spot welding firm welding be on underframe.
Step 2: the underframe of firm welding is clamped on GR510 Digit Control Machine Tool, it is carried out to machined.This is the key of processing method in the present invention, in order to reach the mounting condition of engine, whole milling is carried out on surface to two bearings 1 and two bearings 24, bearing 1 and bearing 24 plane above are all kept at grade, guarantee flatness and the depth of parallelism of four bearings of underframe.The allowance that artwork can leave 4mm (as shown in Figure 2, plectane 11 can leave the allowance of 4mm), after processing, guaranteed on the one hand the overall height dimension of underframe, form and position tolerance is also guaranteed on the other hand, at this procedure, comprise the selection of lathe, the selection of cutting three elements etc. all will strictly be controlled, to guarantee the precision of processing.
Step 3: after milling, underframe still keeps original clamping position, the installing hole 10 of drilling engine on bearing 1 and bearing 24, during boring, utilize drill jig to carry out tool setting drilling, the position size that has guaranteed corresponding aperture on installing hole 10 on underframe and engine matches, and the only guaranteed relative position relation in hole, could the final installation accuracy that guarantees engine.
Step 4: plate 47, angle steel 1 and side bar 8 are offered to installing hole 10, are equally also postwelding processing, and on this installing hole 10 and engine, the position size of corresponding aperture matches.Can well guarantee the relative position of these installing holes like this, and then guarantee the installation site of underframe on Platform of Excavators.
In addition, at four bearings of configuration aspects engine (2 bearing 1 with 2 bearings two 4 identical with its structure) also from original three plates overlap joints welding, be replaced into the structure of welding plectane 11 on bending plate 12, plectane 11 is penetrated with an installing hole 10 with the center of bending plate 12.So not only make the intensity of bearing be improved, by reducing weld seam, reduce the possibility of concentrating of welding deformation and stress and bearing fracture, and shortened process time, group to time precision more easily hold.Finally cause the installation accuracy of engine to be improved, underframe anti-seismic performance is improved.
Claims (3)
1. a processing method for the engine underframe of mini-excavator, is characterized in that, comprises the following steps:
Step 1: each parts on underframe are arrived together by frock welding;
Step 2: the underframe of firm welding is clamped on GR510 Digit Control Machine Tool, whole milling is carried out on surface to one (3) and two bearing two (4) of two bearings, and bearing one (3) and bearing two (4) plane above are all kept at grade;
Step 3: after milling, underframe still keeps original clamping position, installing hole (10) at bearing one (3) and bearing two (4) upper drilling engines, during boring, utilize drill jig to carry out tool setting drilling, guaranteed that the position size of corresponding aperture on the installing hole on underframe (10) and engine matches;
Step 4: plate four (7), angle steel one (2) and side bar (8) are offered to installing hole (10), and on this installing hole (10) and engine, the position size of corresponding aperture matches.
2. the processing method of the engine underframe of a kind of mini-excavator as claimed in claim 1, it is characterized in that, described step 1 is specially: plate one (1) is connected with plate four (7), the two ends of plate four (7) are connected with one end of side bar (8) with one end of angle steel one (2) respectively, the other end of the other end of angle steel one (2) and side bar (8) is all connected with the two ends of plate three (6), one side of plate three (6) is provided with plate two (5), between angle steel one (2) and side bar (8), be provided with angle steel two (9), angle steel one (2) is equipped with bearing two (4) with the centre position of side bar (8) inner side, one end of one end of angle steel one (2) and side bar (8) is equipped with bearing one (3) near the position of plate four (7).
3. the processing method of the engine underframe of a kind of mini-excavator as claimed in claim 1, it is characterized in that, described bearing one (3) is identical with the structure of bearing two (4), include plectane (11), plectane (11) bending plate (12) is below penetrated with an installing hole (10) with plectane (11) welding, plectane (11) with the center of bending plate (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210272106.8A CN102848140B (en) | 2012-08-01 | 2012-08-01 | Machining method for engine chassis of small excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210272106.8A CN102848140B (en) | 2012-08-01 | 2012-08-01 | Machining method for engine chassis of small excavator |
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| Publication Number | Publication Date |
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| CN102848140A CN102848140A (en) | 2013-01-02 |
| CN102848140B true CN102848140B (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210272106.8A Active CN102848140B (en) | 2012-08-01 | 2012-08-01 | Machining method for engine chassis of small excavator |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103341708B (en) * | 2013-06-21 | 2015-03-11 | 龙工（上海）挖掘机制造有限公司 | Method for machining universal robot welding fixture of middle-large size excavator movable arm and supporting base |
| CN113385888B (en) * | 2021-05-31 | 2024-01-19 | 苏州美达王钢铁制品有限公司 | Machining process of lower frame and rotating surface integrated machine of medium-sized excavator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4296987B2 (en) * | 2004-04-30 | 2009-07-15 | 三菱自動車工業株式会社 | Engine mount structure |
| JP4474222B2 (en) * | 2004-07-22 | 2010-06-02 | 日立建機株式会社 | Swivel frame structure for construction machinery |
| CN102019511A (en) * | 2009-09-09 | 2011-04-20 | 中国北车集团大同电力机车有限责任公司 | Assembly welding technology of lifting frame of heating furnace |
| CN201574424U (en) * | 2009-12-29 | 2010-09-08 | 斗山工程机械（中国）有限公司 | Engine support for excavating machine and excavating machine |
| CN102505725A (en) * | 2011-10-24 | 2012-06-20 | 徐州徐工挖掘机械有限公司 | Engine mounting and fixing structure for excavator |
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