A multi-pass remanufacturing method for fluid inlet and outlet

Abstract

The application provides a remanufacturing method for a multi-pass block for liquid inlet and return, and a replacement hole with a diameter smaller than a minimum processing size of an additive is used as an additive replacement hole; the method comprises the following steps: step 1, a positioning groove is milled near an interface where the additive replacement hole is located; step 2, a new hole is opened in a vertical direction of a groove bottom of the positioning groove, and the new hole is communicated with the same internal passage as the additive replacement hole; step 3, a joint seat with a shape adapted to the width and depth of the positioning groove is manufactured, and a replacement sealing hole matched with the new hole is manufactured on the joint seat; and step 4, an outer hole part of the original additive replacement hole is expanded, the expanded outer hole area is closed by a sealing plug and is welded and fixed, the original additive replacement hole is completely closed, and the repair is completed. The method has the advantages of repairing the multi-pass block for liquid inlet and return by the remanufacturing technology and guaranteeing the structural performance of the multi-pass block.

Description

Technical Field

[0001] This invention relates to the field of remanufacturing technology, and more specifically, to a method for remanufacturing a liquid inlet / outlet multi-channel block. Background Technology

[0002] The inlet and return multi-channel block is an integrated valve block structure with multiple channels used in hydraulic systems. After a period of use, the various sealing inner holes often become unusable due to rust and need to be replaced.

[0003] Multi-pass blocks are made of carbon steel or stainless steel. They are large in size and heavy in weight, and the cost of scrapping and replacing them is high. The purchase cost of a single multi-pass block often ranges from 5,000 to 10,000 yuan, resulting in a great deal of waste.

[0004] In the field of hydraulic support remanufacturing, many hydraulic equipment are expensive to produce, so remanufacturing is often used to repair damaged parts. The general idea is to carry out additive remanufacturing on the basis of the original structure, retain most of the original workpiece structure, and ensure the mechanical properties of the repaired parts through additive manufacturing. Finally, the performance of the remanufactured workpiece meets or even exceeds the performance of the original workpiece.

[0005] For inlet and outlet multi-port blocks, if the goal is to repair them using remanufacturing technology, the main consideration should be the repair of the various sealing inner holes of the multi-port 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 technological solution. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a remanufacturing method for inlet and outlet multi-channel blocks that repairs the multi-channel block while ensuring its structural performance.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is: a remanufacturing method for inlet and outlet liquid multi-channel blocks, which is remanufactured in the following manner: Based on the inner diameter of each hole in the multi-pass block, holes with a diameter larger than the minimum additive manufacturing size are designated as additive manufacturing holes; holes with a diameter smaller than the minimum additive manufacturing size are designated as additive replacement holes. For additively machined holes, low-temperature internal hole additive manufacturing methods are used for direct machining and repair. For additive replacement holes, repair them using the following steps: Step 1) Mill a positioning groove near the interface where the additive replacement hole is located. The groove wall 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) Drill a new hole vertically along the bottom of the positioning groove, and the new hole is connected to the same internal channel as the additive replacement hole; Step 3) Manufacture a connector seat whose shape is adapted to the width and depth of the positioning groove. The connector seat has a replacement sealing hole that matches the new hole. Install the connector seat into the positioning groove and weld it in place. The replacement sealing hole is through and concentric with the new hole. Step 4) Enlarge the outer hole of the original additive replacement hole, seal the enlarged outer hole area with a sealing plug and weld it in place, thus sealing the original additive replacement hole completely; Step 5) Trim the outer contour, polish and clean it to complete the repair.

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

[0010] Based on the above, the multi-pass block is a triangular multi-pass block, the inner holes of the multi-pass 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 apex of the triangle is provided with a liquid passage hole.

[0011] Based on the above, the fluid passage is the additive replacement passage.

[0012] Based on the above, the original additive replacement hole and the new hole of the liquid passage are set on both sides of the center line with the center line of the thickness direction of the multi-pass block as the boundary.

[0013] Based on the above, the original additive replacement holes and new holes of the liquid passage are symmetrically arranged with the center line of the thickness direction of the multi-pass block as the boundary.

[0014] Based on the above, the inner end of the original additive replacement hole and the inner end of the new hole of the liquid passage are connected to both sides of the same position in the same internal channel.

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

[0016] Based on the above, in the repair structure of the multi-channel block, a new stepped positioning groove is formed at the location of the original additive replacement hole.

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

[0018] 2. For small holes that cannot be directly repaired by additive manufacturing technology, taking advantage of the fact that such small holes usually occupy less than half of the thickness of the multi-pass block, positioning grooves are opened in adjacent areas and new holes are machined to replace the old holes. A connector is installed at the new hole to ensure the functionality of the hole structure, and a sealing head is used to seal the old hole to form a new passage structure.

[0019] 3. To ensure the remanufacturing feasibility of such multi-pass blocks, the significantly smaller holes in the multi-pass blocks are optimized at the design level so that the additive replacement holes only occupy half of the thickness of the multi-pass blocks, while the other half is reserved for adding new holes to replace the original additive replacement holes in the later remanufacturing process, thus optimizing the structure from the perspective of new product design.

[0020] 4. In a specific triangular multi-pass block structure, the fluid passage hole designed at the apex 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 fluid passage hole for positioning during the installation of the multi-pass block structure. In the repaired structure, a stepped positioning groove can still be generated for positioning during the installation of the multi-pass block structure, so that the positioning structure is retained in both the front and rear structures, ensuring the accuracy requirements of the installation process. Attached Figure Description

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

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

[0023] Figure 3 This is a schematic diagram of the multi-channel block structure with the positioning groove milled in this invention.

[0024] Figure 4 This is a schematic diagram of the multi-channel block structure after the connector seat is installed in this invention.

[0025] Figure 5 This is a schematic diagram of the internal pathways of the repaired multi-pass block in this invention.

[0026] Figure 6 This is a schematic diagram of the connector seat in this invention.

[0027] In the diagram: 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 Implementation

[0028] The technical solution of the present invention will be further described in detail below through specific embodiments.

[0029] like Figures 1-6 As shown, a method for remanufacturing a liquid inlet / outlet multi-channel block involves remanufacturing in the following manner: Based on the inner diameter of each hole in the multi-pass block, holes with a diameter larger than the minimum additive manufacturing size are designated as additive manufacturing holes; holes with a diameter smaller than the minimum additive manufacturing size are designated as additive replacement holes.

[0030] For additively machined holes, low-temperature internal hole additive manufacturing methods are used for direct machining and repair. Specifically, existing low-temperature internal hole additive manufacturing methods include the following steps: sandblasting – internal hole cladding additive manufacturing – machining center (milling additive internal holes) – grinding and cleaning – electroplating (electroplating is not required for stainless steel).

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

[0032] Taking the multi-pass block provided in this embodiment as an example, the multi-pass block is a triangular multi-pass block. The inner holes of the multi-pass 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 apex of the triangle is provided with a liquid passage hole.

[0033] This multi-pass block has four hydraulic sealing holes of various specifications. Current low-temperature high-precision internal hole additive manufacturing technology can solve the problem of cladding additive manufacturing of internal holes with a diameter of Φ28 or larger. Depending on the material requirements, it can clad additive manufacturing of stainless steel, copper alloys and other metals to meet the additive manufacturing 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 remanufactured by additive manufacturing. The fourth sealing hole 4 with a diameter of Φ14 is too small to be added by additive manufacturing. It is classified as an additive replacement hole and the following repair work is carried out.

[0034] Step 1) A positioning groove 101 is milled near the interface where the additive replacement hole 100 (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 positioning groove 101 has two main functions: firstly, it can serve as a reference surface to ensure perpendicularity when machining new holes; secondly, it serves as a positioning reference structure for the assembly of the connector seat when installing the connector seat.

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

[0036] In this embodiment, the internal channel 104 is centrally located, and the positioning groove 101 and the new hole 103 are located on both sides of the center line of the thickness direction of the multi-pass block, and are symmetrically positioned. 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 passage of the two holes does not interfere with each other and the positions are basically the same. The interference on the internal liquid conduction is also the same, thereby ensuring that its performance is basically the same as the original performance.

[0037] Step 3) Manufacture a connector seat 105 whose shape is adapted to the width and depth of the positioning groove 101. A replacement sealing hole 106 matching the new hole is manufactured on the connector seat 105. Install the connector seat 105 into the positioning groove 101 and weld it in place. The replacement sealing hole 106 is connected to and concentric with the new hole 103 to form a new liquid passage.

[0038] The reason for adding connector seat 5 instead of machining the complete liquid passage hole directly in the multi-pass block is that the overall structure of the multi-pass block is usually irregular and has a large weight and volume, making it difficult to machine directly by a machining center. The method of machining the positioning groove first, then machining connector seat 105, and then assembling and welding them together is more economical and can ensure the performance of the newly created liquid passage hole. Moreover, there are many machining details in the outer end connector area of ​​the liquid passage hole, while the structure of connector seat 105 is relatively regular. The most details can be machined on the basis of the structure of connector seat 105 to ensure the stable performance of the liquid passage hole.

[0039] Step 4) Enlarge the outer hole of the original additive replacement hole 100 to φ20, and seal and weld the enlarged outer hole area with the sealing plug 107. Specifically, the original additive replacement hole 100 is completely sealed by the plug weld technique.

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

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

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

[0043] In a preferred embodiment, 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 provided at the location of the new hole. Half of the thickness is used to manufacture the positioning groove structure. Retaining this space makes it convenient to process and replace the original liquid passage hole with a new hole in the subsequent remanufacturing process. Moreover, the position of the positioning groove is inherent in the original manufacturing process, resulting in higher precision and consistency. Based on this stepped positioning groove 109, it will be 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 at the location of the original additive replacement hole. The new stepped positioning groove has the same function as the original stepped positioning groove, both of which are for determining the position when installing the multi-pass block. It can be adapted to the same external positioning structure, so that the structural design is not wasted, no new positioning method is needed, and the remanufacturing performance is better.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for remanufacturing a multi-channel block for inlet and outlet liquids, characterized in that: Remanufacturing can be carried out in the following ways: Based on the inner diameter of each hole in the multi-pass block, holes with a diameter larger than the minimum additive manufacturing size are designated as additive manufacturing holes; holes with a diameter smaller than the minimum additive manufacturing size are designated as additive replacement holes. For additively processed holes, a low-temperature internal hole additive manufacturing method is used for direct processing and repair. The low-temperature internal hole additive manufacturing method includes the following steps: sandblasting, internal hole cladding additive manufacturing, machining center for milling additive internal holes, grinding and cleaning, and electroplating. If the material is stainless steel, electroplating is not required. For additive replacement holes, repair them using the following steps: Step 1) Mill a positioning groove near the interface where the additive replacement hole is located. The groove wall 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) Drill a new hole vertically along the bottom of the positioning groove, and the new hole is connected to the same internal channel as the additive replacement hole; Step 3) Manufacture a connector seat whose shape is adapted to the width and depth of the positioning groove. The connector seat has a replacement sealing hole that matches the new hole. Install the connector seat into the positioning groove and weld it in place. The replacement sealing hole is through and concentric with the new hole. One side of the connector seat is aligned with the surface of the multi-pass block. The side of the connector seat is provided with a mounting hole. Step 4) Enlarge the outer hole of the original additive replacement hole, seal the enlarged outer hole area with a sealing plug and weld it in place, thus sealing the original additive replacement hole completely; Step 5) Trim the outer contour, polish and clean it to complete the repair.

2. The method for remanufacturing inlet and outlet multi-channel blocks according to claim 1, characterized in that: The multi-pass block is a triangular multi-pass block, with its inner holes distributed symmetrically on two of the hypotenuses of the triangle. The base and sides of the triangle are provided with connecting holes, and the apex of the triangle is provided with a liquid passage hole.

3. The method for remanufacturing inlet and outlet multi-channel blocks according to claim 2, characterized in that: The fluid passage is the additive replacement hole.

4. The method for remanufacturing inlet and outlet multi-channel blocks according to claim 3, characterized in that: The original additive replacement hole and the new hole of the liquid passage are set on both sides of the center line with the center line in the thickness direction of the multi-pass block as the boundary.

5. The method for remanufacturing inlet and outlet multi-channel blocks according to claim 4, characterized in that: The original additive replacement holes and new holes of the liquid passage are symmetrically arranged with the center line of the multi-pass block thickness direction as the boundary.

6. The method for remanufacturing inlet and outlet multi-channel blocks according to claim 5, characterized in that: The inner ends of the original additive replacement hole and the inner ends of the new hole are connected to the two sides of the same position in the same internal channel.

7. The method for remanufacturing inlet and outlet multi-channel blocks according to claim 6, characterized in that: In the original structure of the multi-channel block, a stepped positioning groove is provided at the location of the new hole.

8. The method for remanufacturing inlet and outlet multi-channel blocks according to claim 7, characterized in that: In the repair structure of the multi-pass block, a new stepped positioning groove is formed at the location of the original additive replacement hole.

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