Remanufacturing method of liquid inlet and return multi-way block

Abstract

The invention provides a remanufacturing method of a liquid inlet and return multi-way block. The hole diameter of the multi-way block is smaller than the minimum machining size of additive materials to serve as an additive material replacement hole; the repairing method comprises the following steps that (1) a positioning groove is milled near an interface where the additive replacement hole is located; (2) a new hole is formed in the vertical direction of the groove bottom of the positioning groove, and the new hole and the additive replacement hole are communicated to the same internal channel; (3) a connector base with the shape matched with the width and depth of the positioning groove is manufactured, and a replacement sealing hole matched with the new hole is manufactured in the connector base; 4, the outer hole part of the original additive replacement hole is expanded, the expanded outer hole area is sealed through a sealing plug and welded and fixed, the original additive replacement hole is wholly sealed, and repairing is completed. The method has the advantages that the liquid inlet and return multi-way block is repaired through the remanufacturing technology, and the structural performance of the multi-way block is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of remanufacturing, and in particular to a remanufacturing method for a liquid inlet and return multi-channel block. Background Art

[0002] The inlet and return multi-way block is an integrated valve block structure with multiple channels used in hydraulic systems. After being used for a period of time, the inner holes of the seals will often become scrapped due to rust and need to be replaced.

[0003] The material of the multi-pass block is carbon steel or stainless steel, the overall volume is large, the weight is heavy, and the overall cost of scrapping and replacing is high. The purchase cost of a single multi-pass block often ranges from 5,000 to 10,000 yuan, causing great waste.

[0004] In the field of remanufacturing of hydraulic supports, many hydraulic equipment usually adopt remanufacturing solutions to repair damaged workpieces due to the high cost of the unit. The general idea is to perform additive remanufacturing based on the original structure, retain most of the structure of the original workpiece, and ensure the mechanical properties of the repaired part through additive methods. Finally, the performance of the remanufactured workpiece meets the qualification requirements of the original workpiece, or even exceeds the performance of the original workpiece.

[0005] For the inlet and return multi-way block, if you want to repair it through remanufacturing technology, the main thing you need to consider is the repair of each sealed inner hole of the multi-way block, especially the repair and remanufacturing of some small-diameter inner holes.

[0006] In order to solve the above problems, people have been seeking an ideal technical solution. Summary of the invention

[0007] The object of the present invention is to address the deficiencies of the prior art and thus provide a method for remanufacturing a liquid inlet and return multi-channel block, which repairs the liquid inlet and return multi-channel block through remanufacturing technology and ensures the structural performance of the multi-channel block.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is: a method for remanufacturing a multi-channel block for liquid inlet and return, which is remanufactured in the following manner: The inner holes in the multi-pass block are grouped based on their inner diameters. The holes with diameters larger than the minimum processing size for additive manufacturing are used as additive manufacturing holes; the holes with diameters smaller than the minimum processing size for additive manufacturing are used as additive replacement holes. For additively processed holes, low-temperature internal hole additive means are used to directly process and repair them; For additive replacement holes, repair them by following these steps: Step 1) milling a positioning groove near the interface where the additive replacement hole is located, wherein the groove wall of the positioning groove is perpendicular to the interface where the additive replacement hole is located, and the groove bottom is parallel to the interface where the additive replacement hole is located; Step 2) drilling a new hole in a vertical direction along the bottom of the positioning groove, wherein the new hole and the additive replacement hole are connected to the same internal channel; Step 3) manufacturing a joint seat whose shape matches the width and depth of the positioning groove, manufacturing a replacement sealing hole matching the new hole on the joint seat, installing the joint seat into the positioning groove and welding it to fix it, and the replacement sealing hole is connected and concentric with the new hole; Step 4) enlarging the outer hole portion of the original additive replacement hole, sealing the enlarged outer hole area with a sealing plug and welding and fixing it, so as to seal the original additive replacement hole as a whole; Step 5) Trim the outer contour, polish and clean to complete the repair.

[0009] Based on the above, one side surface of the connector seat is aligned with the surface of the multi-pass block, and a mounting hole is arranged on the side surface of the connector seat.

[0010] Based on the above, the multi-channel block is a triangular multi-channel block, the inner holes of the multi-channel block are distributed on two of the hypotenuses of the triangle and are symmetrically arranged, the base and side of the triangle are provided with connecting holes, and the vertex of the triangle is provided with a liquid hole.

[0011] Based on the above, the liquid through hole is the additive replacement hole.

[0012] Based on the above, the original material-added replacement hole and the new hole of the liquid through hole are arranged on both sides of the middle line in the thickness direction of the multi-pass block with the middle line as the boundary.

[0013] Based on the above, the original material-added replacement hole and the new hole of the liquid through hole are symmetrically arranged with the middle line of the thickness direction of the multi-pass block as the boundary.

[0014] Based on the above, the inner end of the original material-replaced hole of the liquid-through hole and the inner end of the new hole are connected to the two sides of the same position of the same internal channel.

[0015] Based on the above, in the original structure of the multi-pass block, a stepped positioning groove is provided at the location corresponding to the new hole.

[0016] Based on the above, in the repair structure of the multi-pass block, a new stepped positioning groove is formed corresponding to the position of the original additive replacement hole.

[0017] The present invention has outstanding substantive features and significant progress compared to the prior art. Specifically, the present invention has the following advantages: 1. For multi-pass blocks, a remanufacturing technology has been developed to repair the corroded inner holes, saving costs, with annual savings reaching 10 million yuan.

[0018] 2. For small holes that cannot be repaired directly through additive technology, the characteristic that small holes of this size usually occupy less than half of the thickness of the multi-pass block is utilized. Positioning grooves are opened in adjacent areas and new holes are processed to replace the old holes. Joint seats are installed at the new holes to ensure the functionality of the hole structure. The old holes are sealed with plugs to form a new passage structure.

[0019] 3. In order to ensure the remanufacturing feasibility of such multi-pass blocks, the holes with significantly smaller sizes in the multi-pass blocks are optimized from the design level, so that the additive replacement holes only occupy half of the thickness of the multi-pass block, and the other half of the space is reserved for adding new holes to replace the original additive replacement holes during the later remanufacturing process, thereby optimizing the structure from the perspective of new product design.

[0020] 4. In a specific triangular multi-channel block structure, the liquid through hole designed at the top corner is a typical additive replacement hole. In the optimized design of the original structure, a stepped positioning groove is designed at the position of the liquid through hole for positioning during installation of the multi-channel block structure. In the repaired structure, a stepped positioning groove can still be generated for positioning during installation of the multi-channel block structure, so that the front and rear structures retain the positioning structure to ensure the accuracy requirements of the installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is one of the structural schematic diagrams of the original multi-pass block in the present invention.

[0022] Figure 2 This is the second structural schematic diagram of the original multi-pass block in the present invention.

[0023] Figure 3 It is a schematic diagram of the multi-pass block structure in a state where positioning grooves are milled out in the present invention.

[0024] Figure 4 It is a schematic diagram of the structure of the multi-pass block after the joint seat is installed in the present invention.

[0025] Figure 5 It is a schematic diagram of the internal passages of the repaired multi-pass block in the present invention.

[0026] Figure 6 It is a structural schematic diagram of the connector seat in the present invention.

[0027] In the figure: 1. first sealing hole; 2. second sealing hole; 3. third sealing hole; 4. fourth sealing hole; 100. Additive replacement hole; 101. Positioning groove; 102. Interface; 103. New hole; 104. Internal channel; 105. Connector seat; 106. Replacement sealing hole; 107. Sealing plug; 108. Mounting hole; 109. Stepped positioning groove. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0029] like Figure 1-Figure 6 As shown, a method for remanufacturing a liquid inlet and return multi-channel block is performed by the following methods: The inner holes in the multi-pass block are grouped based on their inner diameters. Holes with diameters larger than the minimum additive processing size are used as additive processing holes; holes with diameters smaller than the minimum additive processing size are used as additive replacement holes.

[0030] For additively processed holes, low-temperature internal hole additive means are used to directly process and repair them; Specifically, the existing low-temperature internal hole additive methods include the following procedures: sandblasting - internal hole cladding additive - machining center (milling additive internal hole) - grinding and cleaning - electroplating (stainless steel does not need electroplating).

[0031] For additive replacement holes, repair them using the following steps.

[0032] Taking the multi-channel block provided in this embodiment as an example, the multi-channel block is a triangular multi-channel block, the inner holes of which are distributed on two of the hypotenuses of the triangle and are symmetrically arranged, connecting holes are arranged on the base and side of the triangle, and liquid holes are arranged at the vertex of the triangle.

[0033] There are four hydraulic sealing holes of different specifications in the multi-channel block. The current low-temperature and high-precision inner hole additive technology can solve the problem of cladding additive for inner holes larger than Φ28. According to the material requirements, stainless steel, copper alloy and other metals can be clad to meet the additive requirements. Therefore, the first sealing hole 1 with a diameter of Φ44, the second sealing hole 2 with a diameter of Φ56, and the third sealing hole 3 with a diameter of Φ31 can be additively remanufactured. The fourth sealing hole 4 with a diameter of Φ14 is too small to be additively manufactured, so it is classified as an additive replacement hole and the following steps of repair are performed.

[0034] Step 1) mill a positioning groove 101 near the interface where the additive replacement hole 100 (the fourth sealing hole) is located. The groove wall of the positioning groove 101 is perpendicular to the interface 102 where the additive replacement hole is located, and the groove bottom is parallel to the interface 102 where the additive replacement hole is located. The main functions of the positioning groove 101 are two aspects. On the one hand, it can be used as a reference surface to ensure verticality when machining a new hole. On the other hand, it serves as a positioning reference structure for assembling the joint seat when installing the joint seat.

[0035] Step 2) a new hole 103 is opened vertically along the bottom of the positioning groove 101 , and the new hole 103 and the additive replacement hole 100 are connected to the same internal channel 104 .

[0036] In this embodiment, the internal channel 104 is centrally arranged, and the positioning groove 101 and the new hole 103 are arranged on both sides of the middle line of the multi-pass block in the thickness direction, and are symmetrically arranged. The inner end of the new hole 103 and the inner end of the additive replacement hole 100 are connected to the internal channel 104 at the same position, and are located on both sides of the internal channel 104, so that the passages of the two holes do not interfere with each other, and the positions are basically consistent, and the interference with the internal liquid conduction is also consistent, thereby ensuring that its performance is basically consistent with the original performance.

[0037] Step 3) manufacture a joint seat 105 whose shape matches the width and depth of the positioning groove 101, manufacture a replacement sealing hole 106 matching the new hole on the joint seat 105, install the joint seat 105 into the positioning groove 101 and weld it to fix, the replacement sealing hole 106 is connected and concentric with the new hole 103 to construct a new liquid hole.

[0038] The reason for adding the joint seat 5 instead of directly processing the complete liquid through hole in the multi-way block is that the overall structure of the multi-way block is usually irregular, and the weight and volume are large, and it is difficult to process it directly by a machining center. It is more economical to first process the positioning groove, then process the joint seat 105, and then assemble and weld them together, and it can guarantee the performance of the newly made liquid through hole. Moreover, there are more processing details in the joint area at the outer end of the liquid through hole, and the structure of the joint seat 105 is relatively regular. Most details can be processed on the basis of the structure of the joint seat 105 to ensure the stable performance of the liquid through hole.

[0039] Step 4) the outer hole portion of the original additive replacement hole 100 is enlarged to φ20, and the enlarged outer hole area is sealed and welded by a sealing plug 107. Specifically, the original additive replacement hole 100 is completely sealed by a plug welding technology.

[0040] In this embodiment, the process of enlarging the positioning groove 101 and the new hole 103 as well as the outer hole portion of the original additive replacement hole 100 to φ20 can be completed in a machining center simultaneously with the step of milling the additive inner holes of other holes.

[0041] Step 5) Trim the outer contour, polish and clean to complete the repair.

[0042] In order to facilitate assembly with other structures, in a preferred embodiment, one side surface of the connector seat 105 is aligned with the surface of the multi-pass block, and a mounting hole 108 is provided on the side surface of the connector seat.

[0043] In a preferred embodiment, in order to ensure that the multi-channel block can be repaired through remanufacturing with the best performance, the original design structure of the multi-channel block is further optimized. Specifically, in the original structure of the multi-channel block, a stepped positioning groove 109 is set at the position corresponding to the new hole, and half of the thickness is used to manufacture the positioning groove structure. Reserving this space can facilitate the subsequent remanufacturing process to process a new hole to replace the original liquid hole. Moreover, the position of the positioning groove is inherent in the original manufacturing process, and the accuracy consistency is higher. Based on the stepped positioning groove 109, it will become more convenient to process it into the positioning groove 101 required in the remanufacturing process.

[0044] Furthermore, in the repair structure of the multi-pass block, a new stepped positioning groove 109 is formed corresponding to the position of the original additive replacement hole. The new stepped positioning groove has the same function as the original stepped positioning groove, and both are used to determine the position when installing the multi-pass block. The same external positioning structure can be adapted to avoid waste in the structural design, eliminate the need to add new positioning methods, and improve remanufacturing excellence.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for remanufacturing a multi-channel block for liquid inlet and return, characterized in that: Remanufacturing is done by: The inner holes in the multi-pass block are grouped based on their inner diameters. The holes with diameters larger than the minimum processing size for additive manufacturing are used as additive manufacturing holes; the holes with diameters smaller than the minimum processing size for additive manufacturing are used as additive replacement holes. For additively processed holes, low-temperature internal hole additive means are used to directly process and repair them; For additive replacement holes, repair them by following these steps: Step 1) milling a positioning groove near the interface where the additive replacement hole is located, wherein the groove wall of the positioning groove is perpendicular to the interface where the additive replacement hole is located, and the groove bottom is parallel to the interface where the additive replacement hole is located; Step 2) opening a new hole in a vertical direction along the bottom of the positioning groove, wherein the new hole and the additive replacement hole are connected to the same internal channel; Step 3) manufacturing a joint seat whose shape matches the width and depth of the positioning groove, manufacturing a replacement sealing hole matching the new hole on the joint seat, installing the joint seat into the positioning groove and welding it to fix it, and the replacement sealing hole is connected and concentric with the new hole; Step 4) the outer hole of the original additive replacement hole is enlarged, the enlarged outer hole area is sealed by a sealing plug and welded to fix the original additive replacement hole as a whole; Step 5) Trim the outer contour, polish and clean to complete the repair.

2. The method for remanufacturing a liquid inlet and return multi-channel block according to claim 1, characterized in that: One side surface of the joint seat is aligned with the surface of the multi-pass block, and a mounting hole is arranged on the side surface of the joint seat.

3. The method for remanufacturing a multi-channel block for liquid inlet and return according to claim 1 or 2, characterized in that: The multi-channel block is a triangular multi-channel block, the inner holes of which are distributed on two oblique sides of the triangle and are symmetrically arranged, the bottom side and side sides of the triangle are provided with connecting holes, and the vertex of the triangle is provided with a liquid hole.

4. The method for remanufacturing a liquid inlet and return multi-channel block according to claim 3, characterized in that: The liquid through hole is the material-adding replacement hole.

5. The method for remanufacturing a liquid inlet and return multi-channel block according to claim 4, characterized in that: The original material-added replacement hole and the new hole of the liquid-through hole are arranged on both sides of the middle line in the thickness direction of the multi-pass block with the middle line as the boundary.

6. The method for remanufacturing a liquid inlet and return multi-channel block according to claim 5, characterized in that: The original material-added replacement holes and the new holes of the liquid-passing holes are symmetrically arranged with the middle line in the thickness direction of the multi-pass block as the boundary.

7. The method for remanufacturing a liquid inlet and return multi-channel block according to claim 6, characterized in that: The inner end of the original material-added replacement hole and the inner end of the new hole of the liquid-through hole are connected to two sides of the same position of the same internal channel.

8. The method for remanufacturing a liquid inlet and return multi-channel block according to claim 7, characterized in that: In the original structure of the multi-pass block, a stepped positioning groove is provided at the location corresponding to the new hole.

9. The method for remanufacturing a liquid inlet and return multi-channel block according to claim 8, characterized in that: In the repair structure of the multi-pass block, a new stepped positioning groove is formed corresponding to the position of the original additive replacement hole.

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