CN112894260B - Hydraulic valve block crack repairing method - Google Patents
Hydraulic valve block crack repairing method Download PDFInfo
- Publication number
- CN112894260B CN112894260B CN202110090372.8A CN202110090372A CN112894260B CN 112894260 B CN112894260 B CN 112894260B CN 202110090372 A CN202110090372 A CN 202110090372A CN 112894260 B CN112894260 B CN 112894260B
- Authority
- CN
- China
- Prior art keywords
- valve block
- positioning sleeve
- spacer ring
- welding
- cracks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- B23P6/00—Restoring or reconditioning objects
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
A hydraulic valve block crack repairing method comprises the steps of firstly processing a positioning sleeve and a spacer ring with matched sizes; preheating the valve block, welding the cracks penetrating through the valve block to the outer surface, and slowly cooling the valve block along with a furnace after welding; then coating electric welding glue on the joint position of the positioning sleeve and the valve block, and installing and adjusting the positioning sleeve to a preset position in a cold-assembling mode; extruding the positioning sleeve along the axial direction through a pre-tightening device, and curing the electric welding glue; the bottom end of the positioning sleeve is provided with a spacing ring, and the axial direction of the positioning sleeve is vertical to the axial direction of the spacing ring. The invention solves the problem that the equipment cannot normally operate due to the slag falling risk caused by adopting a welding method when the inner and surface through cracks are generated on the valve block at present.
Description
Technical Field
The invention belongs to the technical field of hydraulic system valve block design and repair, and relates to a method for repairing cracks of a hydraulic valve block.
Background
The hydraulic valve block is used for integrating or assembling a plurality of selected hydraulic control valve pieces, and corresponding oil passage channels are processed on the same metal block body according to requirements to form an assembly body with a preset control function. The hydraulic valve block can simplify the design and assembly of a hydraulic system, and is beneficial to improving the stability of the system. The valve block is usually a 35 steel forging or a continuous casting blank, and the blank needs to be subjected to normalizing heat treatment to eliminate residual internal stress, and if necessary, the nondestructive inspection technology is applied to perform internal quality inspection.
The pilot channel of each main-grade channel is to remove burrs and flashes, chip impurities in the channel are carefully cleaned before installation, protective measures such as rust prevention and dust prevention are needed during storage, and the pilot channel is properly plugged and placed in a clean and dry environment. The rapid forging hydraulic press has high forging frequency, and after each oil way is frequently switched and used for a long time, fine cracks can appear in the internal structure under the action of fatigue load, the internal structure is continuously deteriorated in subsequent work, finally, pore channels are the same, the action of an actuating mechanism is abnormal, and even personnel injury is caused.
At present, cracks of a hydraulic valve block are treated by a direct welding method, the problems that grooves are difficult to process, welding is difficult, material performance is reduced due to a welding heat affected zone and the like exist, meanwhile, the cracks are welded inside the valve block, after the hydraulic valve block is used for a long time, risks of slag falling and the like exist, and once oil enters, damage to actuating elements such as a hydraulic valve and an oil cylinder can be caused.
Disclosure of Invention
The invention aims to provide a valve block crack repairing method, which solves the problem that equipment cannot normally operate due to the slag falling risk caused by adopting a welding method when internal and surface through cracks are generated in the conventional valve block.
The technical scheme adopted by the invention is as follows:
a hydraulic valve block crack repairing method comprises the following steps:
step 1: processing a positioning sleeve and a spacer ring which are correspondingly matched according to the size of the position of the crack on the inner surface of the valve block and the distribution range of the crack;
step 2: preheating the valve block with the crack at 150-250 ℃, then welding the crack penetrating through the outer surface, and slowly cooling along with the furnace after welding;
and 3, step 3: coating electric welding glue on the joint position of the positioning sleeve and the valve block (namely the position with cracks on the inner surface of the valve block), then installing the positioning sleeve on the preset position in a cold-assembling mode, and matching the positioning sleeve with the original hydraulic fitting through adjustment (namely the positioning sleeve does not influence the normal work of the original hydraulic fitting);
and 4, step 4: the positioning sleeve is extruded along the axial direction by a pre-tightening device and the original bolt hole; then, the electric welding glue is completely cured and has machining and cutting performance;
and 5: a spacer ring is arranged at the bottom end of the positioning sleeve, wherein the axial direction of the positioning sleeve is vertical to the axial direction of the spacer ring; before installing the spacer ring, cutting the contact part of the bottom end of the positioning sleeve and the spacer ring (because the bottom end of the positioning sleeve is a plane and the matching surface of the bottom end of the positioning sleeve and the spacer ring is an arc surface, the matching part of the bottom end of the positioning sleeve and the spacer ring needs to be cut into a concave arc shape, so that the edges of the positioning sleeve and the spacer ring are attached and the flow directions of oil paths are not interfered with each other); then processing the mounting position of the spacer ring, and processing the depth of half of the height of the spacer ring along the axis direction of the valve hole; the spacer ring is installed by the same installation method as the locating sleeve.
Further, in the step 2, in the preheating treatment process, the heating time is 4 hours, and the heat preservation time is 2 hours.
Furthermore, in the welding process of the step 2, the welding part is uniformly knocked at the frequency of 40-50 times/minute to eliminate stress.
Furthermore, the welding in step 2 is divided into 2-3 layers, and when the first layer is welded, the low-current slow welding of 110-140A is adopted to prevent the generation of thermal cracks.
Furthermore, before welding, the crack penetrating to the outer surface in the step 2 is milled into a groove with a U-shaped longitudinal section along the extending direction of the crack on the surface by adopting a milling mode, wherein the depth of the groove is 20mm, the width of the bottom surface is 10mm, and two end points (length directions) in the extending direction respectively exceed the extending end part of the crack by 20 mm.
Furthermore, in step 4, the tightening torque used for pressing the positioning sleeve is 1000 Nm.
Furthermore, the height of the spacer ring is 4-5 times of the axial distribution width of the crack, so that the peripheral crack is completely covered by the spacer ring.
The step depth machining precision of the positioning sleeve meets the installation size tolerance range of the hydraulic valve.
The invention has the beneficial effects that:
through the repair welding of the cracks on the outer surface, the internal cracks are blocked instead of welded, the defects of the cracks are isolated, the oil paths are blocked through the mutual circulation of the cracks, and the functions of the valve block are recovered.
When internal cracks are plugged, the positioning sleeve is used for positioning and circumferential sealing of the large-drift-diameter cartridge valve, and the spacer ring is used for blocking through cracks between pore channels; both adopt the cold charge mode, through expanding the shutoff of mode and separation crack, avoid the welding mode to produce the problem of falling the sediment.
And a u-shaped groove is milled on the surface, so that the welding is firmer and the coverage degree is higher.
Drawings
FIG. 1 is a schematic perspective view of the valve block of the present invention when not in repair;
FIG. 2 is a schematic perspective view of the valve block of the present invention after repair;
FIG. 3 is a cross-sectional view of the valve block of the present invention taken along the width thereof;
FIG. 4 is a cross-sectional view of the valve block of the present invention taken along the length thereof;
FIG. 5 is a perspective view of a position sleeve of the present invention;
FIG. 6 is a perspective view of the spacer ring of the present invention;
FIGS. 7(a) and (b) are cross-sectional views of a valve block made by the present invention without cracks.
In the figure, 1, a cracked valve block, 2, a positioning sleeve, 3 and a spacer ring; A. the processing reference of the positioning sleeve is set,
B. a pore channel crack distribution area, C, a U-shaped groove penetrating to the surface crack and used for welding, and D, a spacer ring processing standard.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a method for repairing cracks of a hydraulic valve block, and the method is shown in attached figures 1-7 and described below.
A hydraulic valve block crack repairing method comprises the following steps:
step 1: processing a positioning sleeve 2 and a spacer ring 3 which are correspondingly matched according to the size of the position of the crack on the inner surface of the valve block 1 and the distribution range of the crack; the height of the spacer ring is 4-5 times of the axial distribution width of the crack, so that the peripheral crack is completely covered by the spacer ring. The positioning sleeve 2 is used for positioning and circumferential sealing of the large-diameter cartridge valve, and the spacer ring 3 is used for blocking through cracks between the pore channels;
step 2: the valve block is mainly made of 35 steel, the valve block 1 with cracks is subjected to preheating treatment at 250 ℃ before welding, the heating time is 4 hours, the heat preservation time is 2 hours, then the cracks penetrating through the outer surface are welded, before welding, a groove with a U-shaped longitudinal section is milled in a milling mode along the extension direction of the cracks on the surface, the depth of the groove is 20mm, the width of the bottom surface is 10mm, and two end points (length directions) in the extension direction respectively exceed the extension end parts of the cracks by 20 mm;
in the welding process, the welding part is uniformly knocked at the frequency of 40-50 times/min to eliminate the stress. The welding is divided into two layers, and when the first layer is welded, the low-current slow welding of 110-140A is adopted to prevent the generation of hot cracks; slowly cooling along with the furnace after welding; and cleaning oil stain and water rust around the welding line before welding. For cracks that do not penetrate to the outer surface, step 2 operations need not be performed.
And step 3: the method comprises the following steps of coating electric welding glue on a joint position (namely a position with cracks on the inner surface of a valve block) of a positioning sleeve 2 and the valve block 1 in advance, installing the positioning sleeve 2 at the preset position in a cold-assembling mode, and matching the positioning sleeve 2 with an original hydraulic fitting through adjustment (namely the positioning sleeve does not influence the normal work of the original hydraulic fitting); the operation needs to be rapid in the installation process, and the situation that the installation gap of the positioning sleeve cannot be guaranteed to be not in place due to overlong adjustment time is avoided.
And 4, step 4: the locating sleeve 2 is axially extruded by the pre-tightening device by utilizing the original bolt hole, and the tightening torque used for extruding the locating sleeve is 1000 Nm; then, the electric welding glue is completely cured and has machining and cutting performance;
and 5: a spacer ring 3 is arranged at the bottom end of the positioning sleeve 2, wherein the axial direction of the positioning sleeve 2 is vertical to the axial direction of the spacer ring 3; before installing the spacer ring 3, firstly, cutting the part of the bottom end of the positioning sleeve 2, which is in contact with the spacer ring 3 (because the bottom end of the positioning sleeve is a plane and the matching surface with the spacer ring is an arc surface, the part of the bottom end of the positioning sleeve, which is matched with the spacer ring, needs to be cut into a concave arc shape, so that the edges of the positioning sleeve and the spacer ring are attached, and the flow directions of oil passages are not interfered with each other); then, processing the installation position of the spacer ring 3, and processing the depth of half of the height of the spacer ring along the axis direction of the valve hole; and the spacer ring is installed by adopting the same installation method as the positioning sleeve.
The step depth machining precision of the positioning sleeve meets the installation size tolerance range of the hydraulic valve.
The locating sleeve and the valve block are matched in an interference fit mode, machining allowance is required to be reserved on the inner side size of the locating sleeve in the machining process, after cold installation is finished, alignment is conducted according to original holes, machining is conducted to the matched size, and the locating sleeve and the original mounting hole are in accordance with the initial requirement in coaxiality.
The spacer ring and the valve block are in interference fit, after the electric welding glue of the sleeve to be positioned is solidified and has mechanical processing performance, the redundant positioning sleeve is cut and removed without being sealed, the mounting position of the spacer ring is processed, the general depth is half of the height of the spacer ring, peripheral cracks can be completely covered by the spacer ring, and the spacer ring is also cold-mounted.
Claims (7)
1. A hydraulic valve block crack repairing method is characterized by comprising the following steps:
step 1: according to the size of the position of the crack on the inner surface of the valve block (1) and the crack distribution range, a positioning sleeve (2) and a spacer ring (3) which are correspondingly matched are machined, wherein the positioning sleeve (2) is used for positioning and circumferential sealing of the large-diameter cartridge valve, and the spacer ring (3) is used for blocking the through crack between the pore channels;
step 2: preheating the valve block (1) with the cracks at the temperature of 150-250 ℃, then welding the cracks penetrating through the outer surface, and slowly cooling along with the furnace after welding;
and step 3: coating electric welding glue on the joint position of the positioning sleeve (2) and the valve block (1) in advance, wherein the joint position is a position with cracks on the inner surface of the valve block (1), then installing the positioning sleeve (2) at the preset position in a cold-assembling mode, and matching the positioning sleeve (2) with the original hydraulic fittings through adjustment;
and 4, step 4: the positioning sleeve (2) is extruded along the axial direction by a pre-tightening device and by utilizing the original bolt hole; then, the electric welding glue is completely cured and has machining and cutting performance;
and 5: a spacer ring (3) is arranged at the bottom end of the positioning sleeve (2), wherein the axial direction of the positioning sleeve (2) is vertical to the axial direction of the spacer ring (3); before the spacer ring (3) is installed, firstly, cutting the part of the bottom end of the positioning sleeve (2) which is contacted with the spacer ring (3); then processing the mounting position of the spacer ring (3), and processing the depth of half of the height of the spacer ring along the axial direction of the valve hole; the spacer ring is installed by the same installation method as the locating sleeve.
2. The method for repairing cracks in a hydraulic valve block as claimed in claim 1, wherein in the step 2, the heating time is 4 hours and the heat preservation time is 2 hours in the preheating treatment process.
3. A method for repairing cracks in a hydraulic valve block according to claim 1, wherein in the welding process of the step 2, the welding part is uniformly knocked at a frequency of 40-50 times/min to eliminate stress.
4. The method for repairing cracks of a hydraulic valve block as claimed in claim 1, wherein the welding in step 2 is divided into 2-3 layers, and when the first layer is welded, the low-current slow welding with 110-140A is adopted to prevent the generation of thermal cracks.
5. The method for repairing the crack of the hydraulic valve block according to claim 1, wherein the crack penetrating to the outer surface in the step 2 is milled along the extending direction of the crack on the surface by a milling mode, wherein the depth of the groove is 20mm, the width of the bottom surface is 10mm, and two end points in the extending direction respectively exceed the extending end part of the crack by 20 mm.
6. A method of repairing cracks in a hydraulic valve block as claimed in claim 1, wherein in step 4, the tightening torque used to squeeze the retaining sleeve is 1000 Nm.
7. A method of repairing cracks in a hydraulic valve block as claimed in claim 1, wherein the height of the spacer ring is 4-5 times the axial width of the crack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110090372.8A CN112894260B (en) | 2021-01-22 | 2021-01-22 | Hydraulic valve block crack repairing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110090372.8A CN112894260B (en) | 2021-01-22 | 2021-01-22 | Hydraulic valve block crack repairing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112894260A CN112894260A (en) | 2021-06-04 |
| CN112894260B true CN112894260B (en) | 2022-09-09 |
Family
ID=76118567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110090372.8A Active CN112894260B (en) | 2021-01-22 | 2021-01-22 | Hydraulic valve block crack repairing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112894260B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1984001119A1 (en) * | 1982-09-24 | 1984-03-29 | Babcock & Wilcox Co | Method of repairing leaks in steam generator tubes |
| CN110091122A (en) * | 2019-04-20 | 2019-08-06 | 广东坚美铝型材厂（集团）有限公司 | A kind of repair apparatus and method for repairing and mending of mold localized cracks |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7513024B2 (en) * | 2005-08-24 | 2009-04-07 | General Electric Company | Method for repairing structural cracks |
| JP4772922B2 (en) * | 2009-01-14 | 2011-09-14 | 新日本製鐵株式会社 | Welded structure with excellent brittle crack propagation resistance |
| KR101229073B1 (en) * | 2012-03-07 | 2013-02-04 | 신흥공업(주) | Valve assembly for a gas torch |
| CN104690482B (en) * | 2015-02-10 | 2017-03-01 | 上海平安高压调节阀门有限公司 | The renovation technique of the high other main valve sealing surface of ultra supercritical coal-fired unit |
| CN104842118A (en) * | 2015-05-28 | 2015-08-19 | 南通市电站阀门有限公司 | Repair welding process for valves |
| CN109773403A (en) * | 2017-11-13 | 2019-05-21 | 中海油惠州石化有限公司 | The method for repairing pressure vessel crackle |
| CN208024911U (en) * | 2018-04-09 | 2018-10-30 | 般德阀门科技有限公司 | A kind of two-way self sealss of valve rod prosthetic device with pressure |
| CN109719455A (en) * | 2018-11-12 | 2019-05-07 | 苏州苏恩奈工程技术有限公司 | A kind of method for maintaining of the interior low voltage bypass valve leaked of valve body |
| CN109465597A (en) * | 2019-01-07 | 2019-03-15 | 浙江翰德圣智能再制造技术有限公司 | A kind of blade dryer axle fracture renovation technique |
| CN110153635A (en) * | 2019-06-14 | 2019-08-23 | 史海燕 | A kind of heterogeneous cold-patch Welding blocking up valve crackle for repairing main steam line online |
| CN111360368A (en) * | 2020-04-29 | 2020-07-03 | 安徽马钢设备检修有限公司 | Online repairing device and process for GLAMA bridge type manipulator box body cross beam cracking |
-
2021
- 2021-01-22 CN CN202110090372.8A patent/CN112894260B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1984001119A1 (en) * | 1982-09-24 | 1984-03-29 | Babcock & Wilcox Co | Method of repairing leaks in steam generator tubes |
| CN110091122A (en) * | 2019-04-20 | 2019-08-06 | 广东坚美铝型材厂（集团）有限公司 | A kind of repair apparatus and method for repairing and mending of mold localized cracks |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112894260A (en) | 2021-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8245375B2 (en) | Apparatus for repairing turbine rotor | |
| KR101737659B1 (en) | Concentric knurl ball joint | |
| US8191529B2 (en) | Method of manufacturing an engine block | |
| EP2300196B1 (en) | Method of reconditioning a cast iron cylinder head of an internal combustion engine | |
| US10272519B2 (en) | Conical pins for the structural repair of defects | |
| CN109262213B (en) | Manufacturing method of large-modulus cast steel large gear ring | |
| CN112894260B (en) | Hydraulic valve block crack repairing method | |
| US10280984B2 (en) | Constant velocity universal joint outer joint member and manufacturing method for same | |
| CN106062400B (en) | Method for manufacturing outer joint member of constant velocity universal joint, outer joint member, shaft member, and cup-shaped member | |
| CN114046287B (en) | Hydraulic integrated cylinder barrel and processing method thereof | |
| CN103143901B (en) | Welding method of high-strength prism drill rod for gas drainage from coal bed | |
| RU2420386C2 (en) | Method of shaft recovery | |
| KR100596983B1 (en) | Cooling water way having repair method cylinder head | |
| CN106312438A (en) | Overhaul process for sealing surface of valve | |
| KR101576645B1 (en) | a method of manufacturing a hot-stamping mold and a hot-stamping mold manufacturing the same method | |
| CN101890609B (en) | Method for repairing lining plate-free flat-head cap of spindle of rolling mill | |
| CN101082357A (en) | Wear resistant brake disc and manufacturing method therefor | |
| CN115302211A (en) | Manufacturing process of gear ring, gear ring and grinding machine | |
| RU171196U1 (en) | DORN FOR LOCAL ELECTROMECHANICAL Hardening | |
| RU2235009C2 (en) | Method for restoring crankshaft and restored crankshaft | |
| CN116765767B (en) | Processing method of thrust sleeve for supercharger | |
| KR20160141536A (en) | Repair method according to the sheet rolling mill roller bearing assembly for a football injury | |
| CN113664469B (en) | Manufacturing method for improving reliability of spraying and lubricating flow passage of rocker arm shell of coal mining machine | |
| CN113146082A (en) | Valve crack cold welding process | |
| CN103406726B (en) | Regulation valve multi-layer labyrinth core packs the method for making and special milling, weld jig |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |