CN1003572B - Repairing method for crack damage of cast diesel engine block - Google Patents
Repairing method for crack damage of cast diesel engine block Download PDFInfo
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- CN1003572B CN1003572B CN86106171.3A CN86106171A CN1003572B CN 1003572 B CN1003572 B CN 1003572B CN 86106171 A CN86106171 A CN 86106171A CN 1003572 B CN1003572 B CN 1003572B
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- shoulder
- frame
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Abstract
A repairing method for the crack damage of the top surface of a cast diesel engine frame is a method for adopting an additional repairing member. Cylinder cover pressing force which centrally acts on the annular area of the top surface of an engine frame is dispersed to a large area which is in contact with the engine frame by the repairing member. Consequently, the present invention avoids or reduces the expansion of cracks and ensures that a repaired diesel engine can continue to normally work for long. The repairing method can be applied for avoiding discarding for the whole diesel engine or the engine frame. The structure of a repaired engine frame is more reasonable than the structure of an original design under the condition of bearing the pressing force of a cylinder cover. Therefore, the repaired diesel engine has reliable work.
Description
The present invention relates to the repair method of diesel engine casting machine top of the trellis panel rhegma.
The cylinder block of medium and small-scale diesel engine and upper crankcase are generally cast integral body.The cylinder block and the upper crankcase of big-and-middle-sized diesel engine are generally individual cast, connect into an integral body after the processing again.Said two devices all is called body or frame, constitutes the skeleton of diesel engine, below is referred to as frame.
All parts and the annex of diesel engine are installed inside and outside the frame, are bearing very complicated load.In actual use, on the supporting ring surface of casting machine top of support with respect to the cylinder jacket shoulder, owing to the thrust that is subjected to cylinder head produces circumference crackle (9) (seeing Fig. 1, shown in Figure 2).
Repair method in the past is the pressure-bearing surface on the framework panel to be warded off cut recessed shoulder, recessed shoulder diameter warded off to cut to strengthen (see figure 3) and be encased inside a red copper ring (7) in the bottom contact with the rhegma face, be encased inside a steel washer (6) on red copper ring (7), the thrust of cylinder head still acts on the rhegma face like this.Therefore, continue to use the crackle second time (10) that produces dilated diameter soon again, and recessed shoulder place continues to ward off and cuts dilated diameter in leeway, makes whole diesel engine or frame face the situation of scrapping never again.
Task of the present invention is to avoid or reduce to greatest extent the expansion of casting machine top of support crackle, and the diesel engine after guaranteeing to repair can be worked stably in a long term.
Technical scheme of the present invention is: a kind of repairing method for crack damage of cast diesel engine block, its step is as follows: the rhegma face that the frame end face is engaged with the cylinder jacket shoulder is warded off and is cut recessed shoulder, strengthens recessed shoulder diameter, deepens recessed shoulder, then shoulder behind attenuate, keep the cylinder of correct compression ratio to pack into.The invention is characterized in: adopt repair piece with shoulder and barrel portion, the cylinder of repair piece is packed in the recessed shoulder of frame annular, must keep the gap between the annular recessed shoulder bottom surface on its cylinder bottom surface and the frame end face, with fixture the shoulder of repair piece is pressed on the frame end face, the cooling water pipeline that frame is led to cylinder head passes through from the shoulder of repair piece.The present invention is according to the principle of diffusion-induced stress, use the method for additional repair piece to concentrate cylinder head the thrust that acts on the frame end face annulus area to disperse, under the condition of same clamping cylinder lid, compare before the pressure of unit are and the repairing on the frame end face and can reduce several times.As long as repair piece is rational in infrastructure, can make the ring surface of rhegma no longer bear thrust or only bear very little thrust after the installation, avoid or reduce to greatest extent the expansion of casting machine top of support crackle.Make and face the diesel engine scrapped or frame obtains saving.Repairing the afer bay structure bears the situation of cylinder head thrust and compares with former design and seem more reasonable.Therefore the diesel engine after guaranteeing to repair can be worked stably in a long term.
Advantage of the present invention is the repair issues that can thoroughly solve diesel engine casting machine top of the trellis panel rhegma.And improved the abominable situation that frame was born the cylinder head thrust originally of casting.Repair piece only needs to change spare part after long-time the use.When the diesel engine after the repairing needs dismounting in the daily management maintaining, do not need to increase any work.Repair is simple, fast, do not require and tear the motivation frame open, can place under repair on original-pack fuselage, for example in the repairing of every cylinder of diesel engine, only need just can finish in about 8 hours, the phase of therefore repairing is very short.
Some details of the present invention will be illustrated in conjunction with following example: the type that example-quilt is repaired: the 8HvD48A-2U diesel engine
Rated output power: 970KW(1320PS)
Factory: German Democratic Republic Ma Gedebao " Ka Erlibukeneici " Heavy Machines Plant.
Rack construction: monoblock cast, material plain cast iron, heavily about 4 tons.
Frame profile: length * wide * height=3960mm * 960mm * 1450mm
The Figure of description explanation:
Fig. 1: represent this example casting machine top of support partial sectional view.
Fig. 2: the installation site (shown in figure coideal line) of expression casting machine top of support crackle (9) enlarged drawing and relevant annex.
Fig. 3: be illustrated in before the present invention, repair method in the past, and produce the position of crackle (10) for the second time.
Fig. 4: expression is used the structure of repair method of the present invention and is always schemed.
Fig. 5: the structure chart of representing the repair piece (5) that repair method of the present invention adopts.
Fig. 6: represent that repair method of the present invention is in order to substitute the view that compresses double-screw bolt (2) that former cylinder head compresses the tape spool neck shoulder of double-screw bolt (8).
Fig. 7: represent original frame (1) because the needs that correctly cooperate on the structure require it is carried out the schematic diagram of partial operation.
Fig. 8: represent original cylinder jacket (4) because the needs that correctly cooperate on the structure require it is carried out the schematic diagram of partial operation.
The Figure of description label is represented:
(1) casting frame (2) tape spool neck shoulder compresses
(3) cylinder head stud
(4) cylinder jacket (5) repair piece
(6) steel washer (7) red copper ring
(8) former cylinder head compresses double-screw bolt (9) and represents crackle for the first time
(10) represent crackle (11) coolant guide pipe through hole for the second time
(12) repair piece fit diameter (13) strengthens with recurve shoulder diameter
(14) the original thickness of cylinder jacket shoulder
(15) thickness behind the cylinder jacket shoulder light car attenuate
0-0 represents the position of critical section
The casting frame (1) of diesel engine has produced rhegma before repairing, the position of crackle (9) is place, summit, right angle on frame end face and the recessed shoulder of the corresponding annular of cylinder jacket shoulder, and the crackle of inclination is along the circumferential direction expanded (seeing Fig. 1, shown in Figure 2).
Use repair method of the present invention and be on the end face of frame (1) and rhegma face that the cylinder jacket shoulder engages, to ward off and cut recessed shoulder, strengthen recessed shoulder diameter, deepen recessed shoulder, summit, right angle, recessed shoulder bottom surface with the arc transition (seeing shown in Figure 7) of R2 on the diameter (13) that strengthens, a repair piece that increases newly is installed as shown in Figure 5, repair piece has shoulder and barrel portion, cylinder diameter (12) is slidingly matched through warding off the recessed shoulder diameter of cutting after strengthening intensification (13) with frame, to guarantee having correct center line through the cylinder after repairing.Strengthening on the recessed shoulder of the frame annular plane after deepening allows original crack to exist, but must keep the gap between the cylinder bottom surface of repair piece (5) and the recessed shoulder of the frame annular plane, so just can avoid the cylinder head thrust no longer to act on the annular recessed shoulder plane of frame rhegma, repair piece (5) is gone up the shoulder bottom surface vertical with cylinder axis, using fixture is pressed on shoulder on the frame face, because the area of shoulder bottom surface is than the big several times in frame annular recessed shoulder plane of original rhegma, therefore the thrust that cylinder head is concentrated can be distributed on the bigger bearing plane of frame end face, thereby reduce the pressure that frame end face unit are is born significantly.
Cut the annular recessed shoulder that strengthens after deepening through warding off, coat fluid sealant, fluid sealant is also coated at the back side of repair piece (5), again repair piece (5) is installed in the relevant position on the frame (1), what screw on six roots of sensation tape spool neck shoulder then compresses double-screw bolt (2), repair piece (5) is pressed on the frame end face firmly, and fluid sealant seals contact-making surface, spills to prevent cooling water.
In order to guarantee that repairing the back diesel engine has correct compression ratio, must be with original shoulder thickness (14) at cylinder jacket (4) top, the light car is thinned to the thickness (seeing shown in Figure 8) of (15).The inside lock of processing cylinder jacket shoulder should adopt circular arc R 3 transition, avoids stress to concentrate.3 * 45 chamfered edges are adopted in the outer corner of shoulder, could correctly be installed on the repair piece (5).
The fixed form of repair piece can be used bolt, shop bolt, pressing plate in addition, but in order to simplify mounting structure, this example compresses double-screw bolt (8) with original cylinder head and changes into a structure that compresses double-screw bolt (2) that has axle neck shoulder, to enlarge its purposes; The bottom shoulder is used for compressing repair piece (5), and in the rack-mounted original thread of the double-screw bolt lower thread energy hole, double-screw bolt top screw thread is still made the (see figure 6) of using of clamping cylinder lid.
Repair piece must have enough intensity, and the repair piece of this example (5) is at the total stress σ of the critical section of O-O shown in Fig. 5 ∑=2855.8Kg/cm
2, as select 40Cr or No. 45 modified H of steel for use
B255-285, its tensile strength is 9100Kg/cm
2, therefore the margin A of critical section=3.186 have guaranteed that repair piece (5) uses reliably.
According to the difference of type, the profile of repair piece shoulder also can adopt polygon, circle, ellipse.Repair piece (5) can be made one in a cylinder or count one in cylinder.The profile of the repair piece of this example (5) shoulder is that circle was pruned for two round lacking, and its advantage is that machining is easy, and round lacking is in order to avoid the restriction of adjacent two bore spacings before and after pruning; Can increase the contact area of repair piece and framework panel, to reduce the compressive load per unit area of frame end face; Be convenient to the installation of adjacent each cylinder repair piece again.
Real circular arc R 2 transition should be adopted in several corners on the repair piece, concentrate to prevent stress.
The through hole of special construction (11) (see figure 5) has a curved shoulder on the repair piece shoulder, after repair piece (5) is installed on the frame, form same plane with the frame end face, make coolant guide pipe that frame is led to cylinder head can keep original structure and by (11) hole on the repair piece shoulder, also guarantee that the original upper and lower sealing ring of coolant guide pipe can correctly install simultaneously.
Claims (6)
1, repairing method for crack damage of cast diesel engine block, have following steps: the rhegma face that the frame end face is engaged with the cylinder jacket shoulder is warded off and is cut recessed shoulder, strengthen recessed shoulder diameter, deepen recessed shoulder, at last shoulder behind attenuate, keep the cylinder of correct compression ratio to pack into, it is characterized in that: adopt repair piece with shoulder and barrel portion, the cylinder of repair piece is packed in the recessed shoulder of frame annular, must keep the gap between the annular recessed shoulder bottom surface on its cylinder bottom surface and the frame end face, with fixture the shoulder of repair piece is pressed on the frame end face, the cooling water pipeline that frame is led to cylinder head passes through from the shoulder of repair piece.
2, according to the described repair method of claim 1, it is characterized in that: the hole (11) that has cooling water pipeline to pass through on the repair piece shoulder has by hole (11) and it to be loaded onto after the frame form same plane to guarantee the correct curved shoulder of installing of coolant guide pipe and sealing ring thereof with the frame end face.
3, according to the described repair method of claim 1, it is characterized in that: the shoulder profile of repair piece is circle or polygon or ellipse.
4, according to the described repair method of claim 1, it is characterized in that: repair piece is to make one in a cylinder or count one in cylinder.
5, according to the described repair method of claim 1, it is characterized in that: fixture is the double-screw bolt that repair piece and cylinder head is installed on jointly the tape spool neck shoulder in frame original thread hole.
6, according to the described repair method of claim 1, it is characterized in that: fixture is double-screw bolt or shop bolt or pressing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86106171.3A CN1003572B (en) | 1986-09-08 | 1986-09-08 | Repairing method for crack damage of cast diesel engine block |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN86106171.3A CN1003572B (en) | 1986-09-08 | 1986-09-08 | Repairing method for crack damage of cast diesel engine block |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86106171A CN86106171A (en) | 1987-05-06 |
| CN1003572B true CN1003572B (en) | 1989-03-15 |
Family
ID=4803097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN86106171.3A Expired CN1003572B (en) | 1986-09-08 | 1986-09-08 | Repairing method for crack damage of cast diesel engine block |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1003572B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066376C (en) * | 1997-04-22 | 2001-05-30 | 郑钟豪 | Repair method for cast of diesel engine frame work |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8714131B2 (en) * | 2011-09-30 | 2014-05-06 | Caterpillar Inc. | Method of manufacturing an engine block |
| CN103846611A (en) * | 2012-12-06 | 2014-06-11 | 中国二十冶集团有限公司 | Repair method for base frame crack of cutting equipment |
| US8833330B2 (en) | 2012-12-13 | 2014-09-16 | Caterpillar Inc. | Method of manufacturing an engine block |
| CN106141562B (en) * | 2016-06-23 | 2018-06-22 | 中国人民解放军第五七一九工厂 | The restorative procedure and its prosthetic device in the cellular embedded block inner mold face of engine inner wall |
-
1986
- 1986-09-08 CN CN86106171.3A patent/CN1003572B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066376C (en) * | 1997-04-22 | 2001-05-30 | 郑钟豪 | Repair method for cast of diesel engine frame work |
Also Published As
| Publication number | Publication date |
|---|---|
| CN86106171A (en) | 1987-05-06 |
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