A method for machining a balanced valve body

Abstract

The application discloses a processing method of a balance valve body, belongs to the technical field of balance valve body processing, and solves the problems of low product processing qualification rate caused by the oval and eccentric phenomena of a valve core hole in the processing of an existing balance valve body. The method is characterized in that: after the balance valve body is fixed by using a first tooling fixture, the balance valve body is first milled, then an O-shaped ring counterbore is processed, then a flange oil port is processed, then the balance valve body is pressed on a tooling plate by using a screw, and then a valve core hole is roughly processed; after the valve core hole is processed, a slant hole is processed, and then the valve core hole is finely processed; the processing is sequentially and gradually performed, so that the size precision of the valve core hole is ensured; and the processing method of the balance valve body can effectively ensure the size precision of the valve core hole, effectively improve the product qualification rate, and has the characteristics of strong practicability and wide application range.

Description

Technical Field

[0001] The present invention relates to the technical field of balanced valve body processing, and more particularly, to a processing method of a balanced valve body. Background Art

[0002] The balancing valve is a special function valve used to adjust the relative balance of pressure on both sides, or to achieve flow balance by diversion. The processing of the balancing valve body is very complicated. The processing process needs to ensure the accuracy of the oil channel and the switch valve position, otherwise the valve opening position will be inaccurate and scrapped. At the same time, the dimensional accuracy of the valve core hole of the balancing valve body must be guaranteed to ensure the opening and closing of the valve core and prevent leakage.

[0003] The processing of the balancing valve body includes milling surface, processing inclined holes, rough processing of valve core holes and fine processing of valve core holes. In the existing processing process, the inclined holes are usually processed directly on the drilling machine first, and then the valve core holes are rough processed. This method causes that when the valve core hole is rough processed, there is no material on one side of the inclined hole. The tool will deviate toward the inclined hole due to uneven force, causing the cylindricity of the entire valve core hole to be out of tolerance, resulting in elliptical and eccentric appearance of the valve core hole during rough processing. In this case, the fine processing of the valve core hole will also have corresponding elliptical and eccentric phenomena, making the balancing valve core movement process prone to leakage, poor pressure holding effect and other problems, resulting in a low processing qualification rate of the product. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a processing method for a balancing valve body, which can effectively ensure the valve core hole size accuracy requirements, effectively improve the product qualification rate, and has the characteristics of strong practicality and wide application range.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a processing method for a balancing valve body, which is to use a first tooling fixture to fix the balancing valve body, first mill the surface of the balancing valve body, then process the O-ring countersunk hole, and then process the flange oil port, and then use screws to press the balancing valve body onto the tooling plate and then rough-process the valve core hole. After processing the valve core hole, the inclined hole is processed, and after the inclined hole is processed, the valve core hole is fine-processed, and the process is carried out step by step in this order to ensure the dimensional accuracy of the valve core hole.

[0006] As a further improvement, the following specific steps are included:

[0007] S1: Place the balancing valve body on the bottom plate of the first fixture, insert the precast hole of the balancing valve body into the positioning pin, and use the directional pressure block and the pressure plate to pre-tighten the balancing valve body with nuts;

[0008] S2: First adjust the directional pressure blocks on both sides so that the valve core hole of the balancing valve body and the O-ring countersink are parallel. Then place the balancing valve body on a vertical machine tool for milling. After the milling is completed, the O-ring countersink is machined.

[0009] S3: Place the balancing valve body on the bottom plate of the second fixture and position it using two locating pins. First, pre-tighten the two directional pressing blocks near the flange oil port. Then, manually adjust the top column so that the top surface of the adjustment column contacts the bottom of the balancing valve body. Finally, pre-tighten the remaining two directional pressing blocks.

[0010] S4: First, process the flange surface of the balancing valve body to a flatness of 0.05mm, and then process the flange oil port;

[0011] S5: Place the balancing valve body on the tooling plate, press the balancing valve body onto the tooling plate with four screws, and then use a horizontal machine tool to perform rough machining on the valve core hole;

[0012] S6: Install the balancing valve body to the base plate, then install the base plate on the four-axis mounting plate and fix it with screws. The four-axis workbench rotates the product to the required angle, and then the inclined hole is processed;

[0013] S7: After machining the inclined hole, repeat the steps of S5 and use the honing reamer to finish machining the valve core hole.

[0014] Furthermore, in the step S2, the front end of the balancing valve body is first milled down by 0.5 mm to reduce the contact between the product and the fixture.

[0015] Furthermore, in step S3, the adjustment top column includes a plum blossom wheel and a screw, and the plum blossom wheel is threadedly connected to the second fixture through the screw.

[0016] Beneficial effects

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The processing method of the balancing valve body of the present invention is to first rough-process the valve core hole of the balancing valve body and then process the inclined hole. After processing the inclined hole, the valve core hole is fine-processed using a honing reamer. The entire sequence cannot be disordered, so as to ensure that when the valve core hole is roughly processed, the inclined hole has not been processed and there is material, so as to avoid the situation where there is no material on one side of the inclined hole, and the tool will deviate to the inclined hole position due to uneven force, resulting in excessive cylindricity of the entire valve core hole. This method can effectively ensure the processing accuracy of the valve core hole and effectively improve product quality.

[0019] 2. The processing method of the balancing valve body of the present invention, when processing the flange oil port, adjusts the adjustment top column of the second fixture so that the top surface of the adjustment top column contacts the balancing valve body, and the alignment plays a role in adjusting the horizontality, ensuring that the overall flatness of the processed flange surface is 0.05mm, so as to ensure that the verticality of the subsequent valve core hole is more accurate, thereby effectively improving product quality.

[0020] 3. The processing method of the balancing valve body of the present invention uses a first fixture to clamp and process the O-ring countersunk hole, uses a second fixture to clamp and process the flange oil port, and uses a tooling plate and a four-axis mounting plate to clamp and process the valve core and the inclined hole, thereby ensuring that the balancing valve body will not move during the processing and has good flatness. At the same time, it reduces deformation caused by pressing the product, makes processing more convenient, and effectively guarantees processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the process of the present invention;

[0022] Figure 2 This is a schematic structural diagram of a first fixture of the present invention;

[0023] Figure 3 This is a schematic diagram of the actual use structure of the first fixture of the present invention;

[0024] Figure 4 This is a schematic structural diagram of a second fixture of the present invention;

[0025] Figure 5 This is a schematic diagram of the actual use structure of the second fixture of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the tooling plate of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the four-axis mounting plate of the present invention;

[0028] Figure 8 It is a schematic diagram of the cross-sectional structure of the four-axis mounting plate of the present invention.

[0029] Among them: 1-balance valve body, 2-first fixture, 3-locating pin, 4-directional pressure block, 5-pressure plate, 6-nut, 7-O-ring countersunk hole, 8-valve core hole, 9-flange oil port, 10-second fixture, 11-adjusting top column, 12-tooling plate, 13-screw, 14-bottom plate, 15-four-axis mounting plate, 16-oblique hole. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0031] See Figure 1-6, which is a processing method for a balancing valve body of the present invention. The method is to use a first fixture 2 to fix the balancing valve body 1, first mill the balancing valve body 1, then process the O-ring countersunk hole 7, and then process the flange oil port 9. Then, use screws to press the balancing valve body 1 onto the tooling plate 12 and then roughly process the valve core hole 8. After processing the valve core hole 8, the inclined hole 16 is processed. After the inclined hole 16 is processed, the valve core hole 8 is finely processed. The process is carried out step by step in this order, thereby ensuring the dimensional accuracy of the valve core hole.

[0032] In this embodiment, the valve core hole of the balancing valve body is first rough-machined and then the inclined hole is machined. After the inclined hole is machined, the valve core hole is fine-machined using a honing reamer. The entire sequence cannot be messed up, so as to ensure that when the valve core hole is rough-machined, the inclined hole has not been machined and there is material, so as to avoid the situation where there is no material on one side of the inclined hole, and the tool will deviate to the inclined hole position due to uneven force, causing the cylindricity of the entire valve core hole to be out of tolerance. This method can effectively ensure the machining accuracy of the valve core hole and effectively improve product quality.

[0033] Specifically, the following steps are included:

[0034] S1: Place the balancing valve body 1 on the bottom plate 14 of the first fixture 2, insert the precast hole of the balancing valve body 1 into the positioning pin 3, use the directional pressing block 4 and the pressure plate 5 to pre-tighten the balancing valve body 1 with the nut 6, use the directional pressing block 4 to adjust the direction of the casting to prevent excessive deviation of the casting, and then pre-tighten the directional pressing block 4 and the pressure plate 5 with the nut 6 by hand. Adjust the torque wrench to 40Nm, and use the torque wrench to tighten the nuts on the directional pressing block and the pressure plate to 40Nm. The contact surface between the product and the fixture should be as small as possible to provide more processing space;

[0035] S2: First, adjust the directional pressing blocks 4 on both sides so that the valve core hole 8 and the O-ring countersunk hole 7 of the balancing valve body 1 are parallel to each other. Then, place the balancing valve body 1 on a vertical machine tool for milling. After the milling is completed, the O-ring countersunk hole 7 is processed to ensure the processing accuracy of the O-ring countersunk hole 7.

[0036] S3: Place the balancing valve body 1 on the bottom plate 14 of the second fixture 10 and position it using the two locating pins 3. First, pre-tighten the two directional pressing blocks 4 near the flange oil port 9. Then, manually adjust the top column 11 so that the top surface of the adjustment top column contacts the bottom of the balancing valve body 1. Finally, pre-tighten the remaining two directional pressing blocks 4 to ensure that the top surface of the balancing valve body 1 is in a horizontal state, thereby ensuring that the overall flatness of the machined flange surface is within 0.05mm.

[0037] S4: First, process the flange surface of the balancing valve body 1 to a flatness of 0.05mm, and then process the flange oil port 9 to ensure that the flange oil port 9 is processed more accurately;

[0038] S5: Place the balancing valve body 1 on the tooling plate 12 and press the balancing valve body 1 onto the tooling plate 12 using four screws 13. Then, use a horizontal machine tool to perform rough machining on the valve core hole 8 to improve the flatness, ensure that the clamping does not deform, and ensure the accuracy requirements when machining the valve core hole 8.

[0039] S6: Install the balancing valve body 1 on the base plate, then install the base plate 14 on the four-axis mounting plate 15 and fix it with screws. The four-axis workbench rotates the product to the required angle, and then the inclined hole 16 is processed;

[0040] S7: After machining the inclined hole, repeat the steps of S5 and use a honing reamer to finish machining the valve core hole 8.

[0041] Preferably, in step S2, the front end of the balancing valve body 1 is first milled down by 0.5 mm to reduce the contact between the product and the fixture, provide more processing space, and facilitate the operation of the processing personnel.

[0042] Furthermore, in step S3, the adjustment top column 11 includes a plum blossom wheel and a screw, and the plum blossom wheel is threadedly connected to the second fixture 10 through the screw. The plum blossom wheel is rotated to adjust the extension height of the adjustment top column 11, and then the clamping level of the balancing valve body 1 is adjusted to ensure the flatness of the processing.

[0043] In this embodiment, the balancing valve body 1 is first placed on the bottom plate 14 of the first fixture 2, the precast hole of the balancing valve body 1 is inserted into the positioning pin 3, and the balancing valve body 1 is pre-tightened by using the directional pressing block 4 and the pressure plate 5 using the nut 6, and then the directional pressing blocks 4 on both sides are adjusted so that the valve core hole 8 and the O-ring countersunk hole 7 of the balancing valve body 1 are parallel, and then the balancing valve body 1 is placed on the vertical machine tool for milling. After the milling is completed, the O-ring countersunk hole 7 is processed, and then the balancing valve body 1 is placed on the bottom plate 14 of the second fixture 10, and it is positioned by using two positioning pins 3. First, the two directional pressing blocks 4 near the flange oil port 9 are pre-tightened, and then the adjustment top column 11 is manually adjusted so that the top surface of the adjustment top column contacts the bottom of the balancing valve body 1, and finally the remaining two directional pressing blocks 4 are pre-tightened. After tightening, the flange surface of the balancing valve body 1 is processed to a flatness of 0.05 mm, and then process the flange oil port 9, and then place the balancing valve body 1 on the tooling plate 12, and use four screws 13 to press the balancing valve body 1 on the tooling plate 12, and then use the horizontal machine tool to rough-process the valve core hole 8. After rough-processing, install the balancing valve body 1 on the base plate, and then install the base plate 14 on the four-axis mounting plate 15 and fix it with screws. The four-axis workbench rotates, rotates the product to the required angle, and then process the inclined hole 16. Finally, after processing the inclined hole, use a honing reamer to finish the valve core hole 8. The whole process can ensure the accuracy of the processing of each hole position of the balancing valve body 1, and avoid the situation where there is no material on one side of the inclined hole. The tool will deviate to the inclined hole position due to uneven force, resulting in excessive cylindricity of the entire valve core hole. This method can effectively guarantee the processing accuracy of the valve core hole and effectively improve product quality.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A method for processing a balancing valve body, characterized in that: The method comprises the following steps: fixing the balancing valve body (1) with a first fixture (2), milling the balancing valve body (1), processing the O-ring countersunk hole (7), and then processing the flange oil port (9). The balancing valve body (1) is then pressed onto the fixture plate (12) with screws, and then the valve core hole (8) is roughly processed. After the valve core hole (8) is processed, the inclined hole (16) is processed. After the inclined hole (16) is processed, the valve core hole (8) is finely processed. The process is carried out step by step in this order, thereby ensuring the dimensional accuracy of the valve core hole. The specific steps are as follows: S1: Place the balancing valve body (1) on the bottom plate (14) of the first fixture (2), insert the precast hole of the balancing valve body (1) into the positioning pin (3), and use the directional pressure block (4) and the pressure plate (5) to pre-tighten the balancing valve body (1) using the nut (6); S2: First, adjust the directional pressing blocks (4) on both sides so that the valve core hole (8) of the balancing valve body (1) and the O-ring countersunk hole (7) are parallel to each other, and then place the balancing valve body (1) on a vertical machine tool for milling. After the milling is completed, the O-ring countersunk hole (7) is processed. S3: Place the balancing valve body (1) on the bottom plate (14) of the second fixture (10), and position it using two positioning pins (3). First, pre-tighten the two directional pressing blocks (4) near the flange oil port (9). Then, manually adjust the top column (11) so that the top surface of the adjustment top column contacts the bottom of the balancing valve body (1). Finally, pre-tighten the remaining two directional pressing blocks (4). S4: First, process the flange surface of the balancing valve body (1) to a flatness of 0.05 mm, and then process the flange oil port (9); S5: Place the balancing valve body (1) on the tooling plate (12), press the balancing valve body (1) onto the tooling plate (12) using four screws (13), and then perform rough machining on the valve core hole (8) using a horizontal machine tool; S6: Install the balancing valve body (1) on the base plate, then install the base plate (14) on the four-axis mounting plate (15) and fix it with screws. The four-axis workbench rotates to rotate the product to the required angle, and then process the inclined hole (16); S7: After machining the inclined hole, repeat the steps of S5 and use the honing reamer to finish machining the valve core hole (8).

2. A method for processing a balancing valve body according to claim 1, characterized in that: In the step S2, the front end of the balancing valve body (1) is first milled down by 0.5 mm to reduce the contact between the product and the fixture.

3. A method for processing a balancing valve body according to claim 2, characterized in that: In the step S3, the adjusting top column (11) comprises a plum blossom wheel and a screw, and the plum blossom wheel is threadedly connected to the second fixture (10) via the screw.

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