Processing method of butterfly valve plate

Abstract

The application discloses a processing method of a butterfly valve plate, and specifically comprises the following steps: rough processing of the valve plate body is carried out on a lathe by using a clamping tool; both sides of the valve plate are turned to be arc-shaped; after turning, the upper end and the lower end of the valve plate are drilled by using a drilling tool, and the drilling is triangular; both sides of the valve plate are coarsely ground and finely ground correspondingly; after the workpiece is ground to the size required by a drawing, the outer ring and the equal-division sector-shaped part are first removed, then the outer ring components are sequentially removed in a clockwise direction, and are transferred to a special flat plate. The valve plate processing method can guarantee the flatness and smoothness of the valve plate processing, guarantee the uniform stress during grinding, improve the precision control of the valve plate size, adopt the arc-shaped surface on both sides of the valve plate, reduce the volume of the valve plate body under the premise of guaranteeing the strength, reduce the resistance generated when water flows, and effectively guarantee the stability of the connection between the valve rod and the plug-in part.

Description

Technical Field

[0001] This invention relates to the field of valve plate equipment technology, and more specifically, to a method for processing a butterfly valve plate. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve that can be used for on / off control of low-pressure pipeline media. A butterfly valve is a type of valve whose closing element is a disc that rotates around the valve shaft to achieve opening and closing. In addition to opening and regulating flow, the most important function of a valve is to seal and close. At this time, the valve must be leak-free when closed. Therefore, the valve seat sealing surface, which plays the main role in closing, is particularly important.

[0003] The sealing performance places extremely high demands on the flatness of the valve plate during processing. Due to its special material properties, temperature changes have a significant impact on its shape and dimensions. In particular, during the grinding process, the continuous action of the grinding wheel on the sealing plate generates high temperatures, causing it to deform due to heat. Currently, the internationally accepted technology is vacuum adsorption processing. However, due to limitations in domestic vacuum adsorption technology, sealing plates processed using the same process cannot meet the requirements for import substitution in terms of parallelism and flatness, making it impossible to achieve the localization of imported rotary valve rotor disc sealing plates.

[0004] Meanwhile, the sealing surface of a traditional valve seat is planar at the contact points between the upper and lower shaft ends and the upper and lower shaft ends of the valve plate, and also planar at the contact points with the outer circle of the valve plate. In addition, due to sealing requirements, there is a very wide sealing surface band. At this time, when the valve plate has not yet reached the closed position, interference has already begun to occur, which greatly increases the operating torque of the valve. Furthermore, because the sealing surface is planar, the sealing effect is not good, which can easily cause leakage or wear and scratches during use. In addition, the two ends of the traditional valve plate are connected to the valve stem through through holes. The shape of the through holes is usually polygonal or square, which has poor fit with the valve stem. When the valve stem rotates, the force is uneven, which can easily cause damage and affect the service life. Summary of the Invention

[0005] The purpose of this invention is to provide a method for processing a butterfly valve plate.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a method for processing a butterfly valve plate, wherein the valve plate has a barbell-shaped cross-section, and the specific steps of the processing method are as follows:

[0007] S1. Use clamping tools to perform rough machining of the valve plate body on a lathe, and adjust the required sealing surface thickness according to the sealing material, and reserve the sealing surface thickness during rough machining.

[0008] S2. Turning: Turn both sides of the valve plate to make both sides of the valve plate arc-shaped;

[0009] S3, connecting hole: after turning, the upper and lower ends of the valve plate are drilled by a drilling tool, and the drilling is triangular;

[0010] S4, fastening of the valve plate and the tooling: fastening bolts are sequentially inserted into the holes of the valve plate and the tooling, and the fastening bolts are locked;

[0011] S5, filling of the core: the outer circle of the tooling plate and the outer circle of the sealing plate are cleaned, and the corresponding cores are installed, and the cores are sequentially clamped on the tooling plate in the clockwise direction;

[0012] S6, rough grinding: the surface of the valve plate is rough ground, the feed amount of the sanding disc after each time of dressing is 0.15mm, the feed box scale and the dial gauge are synchronously displayed, the actual grinding amount is controlled in the range of 0.05-0.08mm, and synchronous measurement and recording are performed;

[0013] S7, fine grinding: the double surfaces of the valve plate are subjected to corresponding rough grinding and fine grinding, after the workpiece is ground to the required size, the outer circle of the equal-angle sector is first removed, then the outer circle components are sequentially removed in the clockwise direction, and are transferred to a special flat plate;

[0014] S8, edge rounding treatment: the edge of the valve plate is rounded by chamfering.

[0015] Preferably, the specific steps of the connecting hole are as follows:

[0016] The coordinate points of the upper and lower ends of the valve plate requiring the hole are determined by a coordinate positioning instrument, a program is compiled, and then the valve body is expanded on the machine tool, the surface quality of the valve hole after expansion reaches Ra0.8, a hard alloy milling cutter with internal cooling hole is used for expansion, and internal cooling and external cooling are simultaneously performed during expansion.

[0017] Preferably, 0.05-0.1mm of fine grinding amount is left during rough grinding in the step S6.

[0018] Preferably, the pressure of the internal cooling during expansion is greater than or equal to 5Mbar, and the pressure of the external cooling is greater than or equal to 2Mbar.

[0019] Preferably, the polishing of the valve plate follows the principle of 'first outer circle and then inner circle for middle and lower workpieces, and first inner circle and then outer circle for upper workpieces'.

[0020] Preferably, the triangular hole at the upper and lower ends of the valve plate is a Lely triangle.

[0021] Compared with the prior art, the application has the following advantages:

[0022] The valve plate machining method can guarantee the flatness and smoothness of valve plate machining, guarantee uniform stress during grinding, improve the precision control of valve plate size, adopt arc surfaces on both sides of the valve plate, reduce the volume of the valve plate body under the premise of guaranteeing strength, reduce weight, save materials used for machining, reduce resistance generated when water flows, make water flow through the butterfly valve more smoothly, reduce damage, and the triangular holes arranged at both ends of the valve plate are accurately positioned in terms of opening and closing angle, and effectively guarantee the stability of the connection between the valve rod and the plug-in part, the stress is uniform when the valve rod rotates, effectively reducing damage during valve rod rotation process, and prolonging service life. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0024] Figure 1 is a flow chart of a valve plate machining method of the present application;

[0025] Figure 2 is a structural diagram of the valve plate of the present application. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present application will be described in detail below with reference to the drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the protection scope of the present application can be more clearly and definitely defined.

[0027] Referring to Figure 1 The present application provides a valve plate machining method of a butterfly valve, the valve plate cross section is dumbbell-shaped, and the valve plate machining method has the following specific steps:

[0028] S1, using clamping tools to perform rough machining of the valve plate body on a lathe, and adjusting the required sealing surface thickness size according to the sealing material, reserving the sealing surface thickness size during rough machining;

[0029] S2, turning: turning both sides of the valve plate to make both sides of the valve plate arc-shaped;

[0030] S3, connecting hole: after turning, drilling holes in the upper and lower ends of the valve plate by using a drilling tool, the holes are triangular;

[0031] S4, fastening of the valve plate and the tooling: inserting fastening bolts hole by hole on the valve plate and the tooling, and locking the fastening bolts;

[0032] S5, filling of the core: clean the outer circle of the tooling plate and the outer circle of the sealing plate and other split holes, and fill the corresponding core. The core is clamped on the tooling plate in a clockwise direction;

[0033] S6, rough grinding: rough grinding is performed on the surface of the valve plate. The feed amount after each sanding is 0.15mm. The feed box scale and the dial indicator display the feed amount synchronously. The actual grinding amount is controlled within the range of 0.05-0.08mm. Synchronous measurement and recording are performed.

[0034] S7, fine grinding: the corresponding rough grinding and fine grinding are performed on the double sides of the valve plate. After the workpiece is ground to the required size, the outer circle and the split sector are removed first, and then the outer circle components are removed in a clockwise direction and transferred to a special flat plate.

[0035] S8, edge rounding treatment: the edge of the valve plate is rounded through the chamfering process.

[0036] In this embodiment, the specific steps of the connecting hole are as follows:

[0037] The coordinate points of the upper and lower ends of the valve plate where the holes are to be taken are fixed by the coordinate positioning instrument. The program is compiled, and then the valve body is expanded on the machine tool. After the hole expansion, the surface quality of the valve hole reaches Ra0.8. A hard alloy milling cutter with internal cooling hole is used for hole expansion. Internal cooling and external cooling are performed simultaneously during hole expansion.

[0038] In this embodiment, the rough grinding in step S6 leaves a fine grinding amount of 0.05-0.1mm.

[0039] In this embodiment, the pressure of the internal cooling during hole expansion is greater than or equal to 5Mbar, and the pressure of the external cooling is greater than or equal to 2Mbar.

[0040] In this embodiment, the grinding of the valve plate follows the principle of "first outer circle then inner circle for middle and lower workpieces, and first inner circle then outer circle for upper workpieces".

[0041] In this embodiment, the triangular holes at the upper and lower ends of the valve plate are Lai Luo triangles.

[0042] The valve plate prepared by the above method is shown in Figure 2 The two sides of the valve plate are arc-shaped, the continuity is strong during switching, the sealing performance is good, and the operation torque is small. The position of the middle part from the shaft center to the sealing part decreases in turn, so that the volume of the valve plate body is reduced under the premise of ensuring the strength, the weight is reduced, the material used for processing is saved, the resistance generated when the water flows is reduced, the water flow through the butterfly valve is smoother, and the damage to the impact plate part is reduced.

[0043] The outer end of the plug-in part is provided with a triangular shaft hole for connecting the valve rod, the switch angle is accurately positioned, and the stability of the connection between the valve rod and the plug-in part is effectively ensured, the force is uniform when the valve rod rotates, the damage in the rotation process of the valve rod is effectively reduced, and the service life is prolonged.

[0044] Although the embodiments of the present application are described in conjunction with the drawings, various changes and modifications can be made by the patent owner within the scope of the appended claims, as long as they do not exceed the protection scope described in the claims of the present application, and should be within the protection scope of the present application.

Claims

1. A method of machining a butterfly valve disc, characterized in that The valve plate section is dumbbell-shaped, and the processing method of the valve plate comprises the following specific steps: S1, rough machining of the valve plate body is performed on a lathe using a clamping tool, and the required sealing surface thickness dimension is adjusted according to the sealing material, and the sealing surface thickness dimension is reserved during rough machining; S2, turning: turning the two surfaces of the valve plate to make the two surfaces of the valve plate arc-shaped; S3, connecting hole: after turning, the upper and lower ends of the valve plate are drilled by a drilling tool, and the drilling is triangular; S4, fastening of the valve plate and the tooling: fastening bolts are sequentially inserted into the holes of the valve plate and the tooling, and the fastening bolts are locked; S5, filling of the core: the outer circle of the tooling plate and the outer circle of the sealing plate are cleaned, and the corresponding cores are inserted, and the cores are sequentially clamped on the tooling plate in the clockwise direction; S6, rough grinding: rough grinding is performed on the surface of the valve plate, the feed amount of the sanding disc after each adjustment is 0.15mm, the feed box scale and the dial indicator are synchronously displayed, the actual grinding amount is controlled within the range of 0.05-0.08mm, and synchronous measurement and recording are performed; S7, fine grinding: the two surfaces of the valve plate are subjected to corresponding rough grinding and fine grinding, after the workpiece is ground to the required size, the outer circle of the equal-angle sector is first removed, then the outer circle components are sequentially removed in the clockwise direction, and are transferred to a special flat plate; S8, edge chamfering: the edge of the valve plate is chamfered by chamfering process.

2. The method of claim 1, wherein, The specific steps of the connecting hole are as follows: The coordinate points of the upper and lower ends of the valve plate are determined by a coordinate positioning instrument, a program is compiled, and then the valve body is expanded on the machine tool, the surface quality of the valve hole after expansion reaches Ra0.8, a hard alloy milling cutter with internal cooling hole is used for expansion, and internal cooling and external cooling are performed simultaneously during expansion.

3. The method of claim 1, wherein: The rough grinding in step S6 leaves 0.05-0.1mm fine grinding amount.

4. The method of claim 1, wherein: The pressure of the internal cooling during expansion is greater than or equal to 5Mbar, and the pressure of the external cooling is greater than or equal to 2Mbar.

5. The method of claim 1, wherein: The polishing of the valve plate follows the principle of "first outer circle then inner circle for middle and lower workpieces, and first inner circle then outer circle for upper workpieces".

6. The method of claim 1, wherein: The triangular holes at the upper and lower ends of the valve plate are Lely triangular holes.

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