Machining method of balance valve body

Abstract

The invention discloses a processing method of a balance valve body, belongs to the technical field of balance valve body processing, and solves the problem of low product processing percent of pass caused by ellipse and eccentricity of a valve core hole processed by the existing balance valve body. According to the method, after the balance valve body is fixed through a first tool clamp, the balance valve body is subjected to face milling, then an O-shaped ring counter bore is machined, then a flange oil port is machined, then a valve element hole is roughly machined after the balance valve body is pressed on a tool plate through a screw, an inclined hole is machined after the valve element hole is machined, and then the balance valve body is machined. According to the machining method of the balance valve body, the size precision requirement of the valve element hole can be effectively guaranteed, the product percent of pass can be effectively increased, and the machining method has the advantages of being high in practicability and wide in application range.

Description

Technical Field

[0001] The invention relates to the technical field of balanced valve body processing, and more specifically, to a balanced valve body processing method. 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 it will cause inaccurate processing of the valve opening position and cause it to be scrapped. At the same time, it is also necessary to ensure the dimensional accuracy of the valve core hole of the balancing valve body to ensure the opening and closing of the valve core and prevent leakage.

[0003] The processing of the balancing valve body includes milling surface, inclined hole, rough processing of valve core hole and fine processing of valve core hole. In the existing processing process, the inclined hole is usually processed directly on the drilling machine first, and then the rough processing of the valve core hole is performed. This method results in that when the valve core hole is rough processed, there is no material on one side of the inclined hole, and the tool will deviate to the inclined hole due to uneven force, causing the cylindrical degree of the entire valve core hole to be out of tolerance, resulting in ellipse and eccentricity in the rough processing of the valve core hole. In this case, the fine processing of the valve core hole will also have corresponding ellipse and eccentricity, which makes 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 deficiencies in 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 a wide range of applications.

[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, firstly mill 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 a tooling plate and then roughly process the valve core hole, and then process the inclined hole after processing the valve core hole, and then finely process the valve core hole after the inclined hole is processed, and proceed 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 pressing block and the pressing plate to pre-tighten the balancing valve body with nuts;

[0008] S2: First adjust the directional pressing blocks on both sides to make the valve core hole of the balancing valve body and the O-ring countersink position parallel, then place the balancing valve body on the vertical machine tool for milling, and then process the O-ring countersink after the milling is completed;

[0009] S3: Place the balancing valve body on the bottom plate of the second fixture, and use two positioning pins to position it. First, pre-tighten the two directional pressing blocks close to the flange oil port, and then adjust the top column by hand so that the top surface of the adjusting top column contacts the bottom of the balancing valve body, and 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 0.05 mm, 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 on the base plate, then install the base plate on the four-axis mounting plate and fix it with screws. The four-axis workbench rotates to rotate the product to the required angle, and then process the inclined hole;

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

[0014] Furthermore, in the step 2, 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 3, the adjustment top column includes a plum blossom wheel and a screw rod, and the plum blossom wheel is threadedly connected to the second fixture through the screw rod.

[0016] Furthermore, in step 5, the valve core hole should be avoided during the pressing process, and a hydraulic tool holder is used. First, a reaming milling cutter φ23 is used, then a reaming milling cutter φ24.65 is used, then a reaming milling cutter φ24.97 is used, and finally a milling cutter φ25 is used to mill the hole step by step in multiple times.

[0017] Furthermore, before performing step 5, the flatness of the upper and lower sides of the balancing valve body must be milled to 0.05 mm.

[0018] Beneficial Effects

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. The processing method of the balancing valve body of the present invention is to firstly perform rough processing on the valve core hole of the balancing valve body and then perform processing on the inclined hole. After processing the inclined hole, a honing reamer is used to perform fine processing on the valve core hole. The whole sequence cannot be disordered, so as to ensure that when the valve core hole is roughly processed, the inclined hole has not been processed yet 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 cylindricality of the entire valve core hole. This method can effectively guarantee the processing accuracy of the valve core hole and effectively improve product quality.

[0021] 2. The processing method of the balancing valve body of the present invention, when processing the flange oil port, adjusts the adjusting top column of the second fixture so that the top surface of the adjusting top column contacts the balancing valve body, and aligns it to adjust 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, effectively improving product quality.

[0022] 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 fixture 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 ensures processing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the process of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the first fixture of the present invention;

[0025] Figure 3 It is a schematic diagram of the actual use structure of the first fixture of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the second fixture of the present invention;

[0027] Figure 5 It is a schematic diagram of the actual use structure of the second fixture of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the tooling plate of the present invention;

[0029] Figure 7 It is a schematic diagram of the structure of the four-axis mounting plate of the present invention;

[0030] Figure 8 It is a schematic diagram of the cross-sectional structure of the four-axis mounting plate of the present invention.

[0031] 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

[0032] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0033] See also Figure 1-6 , which is a processing method for a balancing valve body of the present invention. The method is to fix the balancing valve body 1 with a first fixture 2, first mill the balancing valve body 1, then process the O-ring countersunk hole 7, then process the flange oil port 9, and then use screws to press the balancing valve body 1 onto the fixture 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, and the process is performed step by step in this order, thereby ensuring the dimensional accuracy of the valve core hole.

[0034] In this embodiment, the valve core hole is first rough-machined on the balancing valve body and then the inclined hole is machined. After the inclined hole is machined, a honing reamer is used to fine-machine the valve core hole. The entire sequence cannot be messed up 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. The tool will deviate to the inclined hole position due to uneven force, causing the cylindricity of the entire valve core hole to exceed the tolerance. This method can effectively ensure the machining accuracy of the valve core hole and effectively improve product quality.

[0035] Specifically, the steps include:

[0036] 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 pressing 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 the casting from deviating too much, and then use the directional pressing block 4 and the pressing plate 5 to pre-tighten 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 pressing plate to 40Nm. The contact surface between the product and the fixture should be as small as possible to provide more processing space;

[0037] 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 to ensure the processing accuracy of the O-ring countersunk hole 7;

[0038] 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. Pre-tighten the two directional pressing blocks 4 close to the flange oil port 9 first, and 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, so that the overall flatness of the processed flange surface is within 0.05 mm.

[0039] S4: First, the flange surface of the balancing valve body 1 is processed to a flatness of 0.05 mm, and then the flange oil port 9 is processed to ensure that the flange oil port 9 is processed more accurately;

[0040] S5: Place the balancing valve body 1 on the tooling plate 12, use four screws 13 to press the balancing valve body 1 on the tooling plate 12, and 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;

[0041] 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, rotate the four-axis workbench to rotate the product to the required angle, and then process the inclined hole 16;

[0042] S7: After machining the inclined hole, repeat the steps of S5 and use a honing reamer to finish machining the valve core hole 8.

[0043] Preferably, in step 2, 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.

[0044] Furthermore, in step 3, 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, thereby adjusting the clamping level of the balancing valve body 1 to ensure the flatness of the processing.

[0045] Furthermore, in step 5, avoid the valve core hole 8 during the tightening process, use a hydraulic tool holder, first use the reaming milling cutter φ23, then use the reaming milling cutter φ24.65, then use the reaming milling cutter φ24.97, and finally use the milling cutter φ25, mill the holes step by step in multiple times, gradually process, reduce the runout of the milling cutter, ensure that the valve core hole 8 can be accurately processed, and avoid deformation of the valve core hole 8.

[0046] Furthermore, before performing step 5, the flatness of the upper and lower sides of the balancing valve body 1 must be milled to 0.05 mm to ensure the flatness of the subsequent clamping. If the flatness exceeds the tolerance, it will cause deformation of the clamping in this process.

[0047] 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, the directional pressing block 4 and the pressing plate 5 are used to pre-tighten the balancing valve body 1 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 a 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 using two positioning pins 3, first pre-tighten the two directional pressing blocks 4 close to the flange oil port 9, and then adjust the adjustment top column 11 by hand so that the top surface of the adjustment top column contacts the bottom of the balancing valve body 1, and finally pre-tighten the remaining two directional pressing blocks 4, and after tightening, the flange surface of the balancing valve body 1 is processed to a flatness of 0.05 mm, then process the flange oil port 9, then place the balancing valve body 1 on the tooling plate 12, 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 to rotate 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 cylindricality of the entire valve core hole. This method can effectively ensure the processing accuracy of the valve core hole and effectively improve product quality.

[0048] The above are only preferred embodiments 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, which 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: firstly fixing the balancing valve body (1) with a first fixture (2), then milling the balancing valve body (1), then processing the O-ring countersunk hole (7), and then processing the flange oil port (9). Then, the balancing valve body (1) is 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 processes are performed step by step in this order, thereby ensuring the dimensional accuracy of the valve core hole.

2. A method for processing a balancing valve body according to claim 1, characterized in that: The specific steps include: S1: placing the balancing valve body (1) on the bottom plate (14) of the first fixture (2), inserting the precast hole of the balancing valve body (1) into the positioning pin (3), and pre-tightening the balancing valve body (1) using the directional pressing block (4) and the pressing plate (5) with the nut (6); S2: firstly 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, and then process the O-ring countersunk hole (7) after the milling is completed; S3: Place the balancing valve body (1) on the bottom plate (14) of the second fixture (10), position it using two positioning pins (3), first pre-tighten the two directional pressing blocks (4) close to the flange oil port (9), then manually adjust the top column (11) so that the top surface of the adjusting top column contacts the bottom of the balancing valve body (1), and finally pre-tighten the remaining two directional pressing blocks (4); S4: First, the flange surface of the balancing valve body (1) is machined to a flatness of 0.05 mm, and then the flange oil port (9) is machined; S5: placing the balancing valve body (1) on the tooling plate (12), pressing the balancing valve body (1) onto the tooling plate (12) using four screws (13), and then performing rough machining on the valve core hole (8) using a horizontal machine tool; S6: Install the balancing valve body (1) onto the base plate, then install the base plate (14) onto 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 a honing reamer to finish machining the valve core hole (8).

3. A method for processing a balancing valve body according to claim 2, characterized in that: In the step 2, 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.

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

5. A method for processing a balancing valve body according to claim 2, characterized in that: In step 5, the valve core hole (8) should be avoided during the pressing process, and a hydraulic tool holder is used to first use a hole expansion milling cutter φ23, then a hole expansion milling cutter φ24.65, then a hole expansion milling cutter φ24.97, and finally a milling cutter φ25 to mill the hole step by step in multiple times.

6. A method for processing a balancing valve body according to claim 2, characterized in that: Before proceeding to step 5, the upper and lower sides of the balancing valve body (1) must be milled to a flatness of 0.05 mm.

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