CN113028114A

CN113028114A - Blank body suitable for flat oval cavity of multi-valve type valve and containing valve body and valve cover and forming method

Info

Publication number: CN113028114A
Application number: CN202110403832.8A
Authority: CN
Inventors: 陈崇南
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2021-06-25

Abstract

The invention discloses a blank body with a flat elliptic cavity and a valve body valve cover suitable for a multi-valve and a forming method thereof. The invention has the advantages of environmental protection, good working performance, good product quality and convenient processing.

Description

Blank body suitable for flat oval cavity of multi-valve type valve and containing valve body and valve cover and forming method

Technical Field

The invention relates to a flat elliptic cavity blank containing a valve body valve cover and a forming method, which are suitable for multi-valve valves.

Background

The existing hydraulic forming process is mainly used for processing standardized pipe fittings with simple shapes, such as a tee joint, a four-way joint and the like, and is not suitable for processing pressure-bearing valve blanks with complicated shapes and different size requirements, such as valves (including gate valve flat valve check valves and the like). Most of valve blanks such as the prior gate valve flat check valve and the like adopt casting and forging processes. The casting process has the problems of poor environmental protection, incapability of being used universally by the same-specification different-valve type moulds and the same-specification different-pressure moulds of the same valve type moulds, and poor compactness and quality of castings. The valve body produced by the die forging process has the advantages that the material utilization rate is lower than that of casting, the die is not universal, the cost is high, the valve body produced by the free forging process has the advantages of lower material utilization rate and time-consuming processing, and therefore the valve body produced by the existing casting and forging processes has the defects of low efficiency, long period and high cost.

Disclosure of Invention

The invention aims to provide a blank body which is environment-friendly, good in working performance, good in product quality and convenient to process and is suitable for a flat oval cavity valve body-containing valve cover of a multi-valve and a forming method.

The technical solution of the invention is as follows:

a blank body with a flat oval cavity and a valve body and a valve cover, which is suitable for multi-valve valves, is characterized in that: the blank has the cylinder section that the diameter equals to the right-hand member about the body level, and this cylinder section diameter is fit for valve standard requirement, and the flat oval interlude size in the vertical direction of blank guarantees can be used as the installation that holds the opening and closing member motion space and the sealing member of multiple valve class, and interlude upper portion and lower part are looked the height of different valve classes and are designed, are the cylinder circular cone changeover portion that is fit for the disk seat installation in the transition department of blank interlude and left and right ends cylinder section.

The diameter of the cylindrical section is the same as the outer diameter of the seamless steel pipe blank.

The top of the middle section is provided with a small cylindrical section suitable for a gate valve and a flat valve; the lower part of the middle section is provided with a revolving body suitable for a gate valve and a check valve, and the diameter of the revolving body is equivalent to the long axis of the middle section.

The lower part of the middle section has a lower extension adapted for a plate valve.

A method for forming a blank body with a flat oval cavity and a valve body and a valve cover, which is suitable for multi-valve valves, is characterized by comprising the following steps: designing a concave die with the same shape as the convex blank according to the height of the longest blank tube and the highest middle section, wherein the die consists of an upper die and a lower die, the joint surface of the upper die and the lower die passes through the drift diameter rotation axis of the blank, the symmetrical surface of the die passes through the middle section axis of the blank, two axes are vertically intersected, the upper die is arranged on an upper workbench which moves up and down by a press, and the lower die is fixed on a lower workbench of the press; lifting the upper die to place the tube blank in the middle of the lower die, pressing the upper die to the lower die for combination, pressing left and right press heads provided with sealing gaskets to two ends of the tube blank by a press, injecting high-pressure liquid into the tube blank through holes on the left and right press heads to enable the tube blank to be bent and attached to the inner wall of a cavity of the upper and lower dies, keeping pressing force by the press and enabling the left and right press heads to symmetrically perform material supplementing movement in the bending process until the tube blank is compressed to the structural length required by a blank body, shaping the blank body to the required shape through pressure maintaining, discharging liquid in the cavity of the blank body, withdrawing the left and right.

For the blank with thicker wall thickness, longer structure length and higher pressure, and thicker wall thickness, in order to prevent the lifting of the upper die in the hydraulic forming process, semi-conical ring platforms are respectively reserved at the left end and the right end of the upper die and the lower die, the semi-conical ring platforms at the left end and the right end form a complete external conical surface with a self-locking cone angle, the left end inner cutting sleeve and the right end inner cutting sleeve have the diameter and the cone angle which are matched with the left end external conical surface and the right end external conical surface, and the left end inner cutting; the seamless steel pipe is formed into a valve blank body required by valves such as a gate valve flat valve check valve and the like through different combinations of the upper die and the lower die and the upper adjusting block and the lower adjusting block.

The method comprises the following specific steps:

step 1: preparing tube blanks with matched length, the same outer diameter and wall thickness as the diameters of the left end and the right end of the blank body, the same wall thickness and the same weight, and processing the two end surfaces of the tube blanks to be flat so as to be convenient for sealing;

step 2: the left pressing head and the right pressing head return to the original positions, the left clamping sleeve and the right clamping sleeve return to the original positions, the upper die is lifted, and foreign matters in the lower die are cleaned;

and step 3: placing the blank tube in the middle of the lower die, and pressing down the upper die;

and 4, step 4: pressing the left and right cutting sleeves into the outer conical surfaces of the left and right ends respectively;

and 5: the left and right pressure heads symmetrically press the two end surfaces of the tube blank, the sealing gaskets ensure the sealing between the pressure heads and the tube blank, liquid is injected into the tube blank through holes of the left and right pressure heads, gas is discharged, high pressure in the cavity is kept, the inner cavity of the tube blank is subjected to yield deformation and gradually approaches the inner walls of the cavities of the upper die and the lower die, meanwhile, the press applies force exceeding the strength limit to the tube blank through the left and right pressure heads and is symmetrical to the material supplementing movement of a symmetrical surface until the tube blank is compressed to the structural length required by the blank body, and the blank body is subjected;

step 6: draining liquid in the green body cavity through the hole of the pressure head;

and 7: withdrawing the left and right pressing heads;

and 8: withdrawing the left and right cutting sleeves;

and step 9: lifting the upper die;

step 10: and the ejection column ejects the formed blank out of the lower die, and after the blank is taken out, the ejection column returns to the original position to complete the whole process.

The blank body is divided into a valve body and valve cover two-section blank body at the middle section, and the divided valve body and valve cover blank body can be welded with a flat or round flange so as to meet the requirements of connecting the valve body and valve cover by bolts with different pressures at low and medium pressures; and various valves with welded valve covers can be manufactured by assembling and welding after the valves are machined and assembled as required.

The end part of the blank body is directly processed into a welding end valve according to the requirement of a connecting pipe; or welding flanges according to requirements to manufacture the flange end connected with various valves.

The invention has the following advantages:

1. no solid waste noise in casting process production, less energy consumption, environmental protection and good compactness.

2. Compared with a forging process, the method has the advantages of high material utilization rate, less cutting machining amount and low cost.

3. The hydraulic forming blank has the advantages of good material microstructure flow linearity, high strength, reliable sealing performance, low processing energy consumption and human resource consumption, less cutting amount, difficult damage of a cutter, short manufacturing period and convenient automatic processing.

4. The conical clamping sleeve is adopted for auxiliary pressing, so that the pressure of a main pressure head of the press can be greatly reduced, and the capital investment and the energy consumption in the forming process are reduced.

5. The same die is suitable for processing different valve blanks by simply disassembling and assembling the adjusting block with smaller size, can be used for processing blanks with different pressure standards and different structure lengths, has high mold generalization level, and greatly saves the die cost.

6. The same pipe blank can be made into different valve body valve cover connections (flat flanges or circular flanges or full welding) according to requirements, different end connections (butt welding or flanges) can be made, the blank with thicker wall thickness can cover the blank with thinner wall thickness, and the blank has wide application range.

Drawings

The invention is further illustrated by the following figures and examples.

Fig. 1 is a schematic structural diagram of a flat elliptic cavity gate valve blank body.

Fig. 2 is a side view of fig. 1.

FIG. 3 is a schematic view of a parison tube configuration of the gate valve of FIG. 1.

Fig. 4 is a structural schematic diagram of a flat elliptic cavity flat valve blank.

Fig. 5 is a side view of fig. 4.

Fig. 6 is a schematic view of a blank tube structure of the flat valve of fig. 4.

Fig. 7 is a structural schematic diagram of a flat elliptic cavity check valve blank.

Fig. 8 is a side view of fig. 7.

FIG. 9 is a schematic view of the blank tube structure of the check valve of FIG. 7.

Fig. 10 and 11 are schematic diagrams of the flat elliptic cavity check valve before and after molding respectively.

Fig. 12 and 13 are schematic diagrams of the flat elliptic cavity gate valve before and after molding, respectively.

Fig. 14 and 15 are schematic diagrams of the flat elliptic cavity flat valve before and after molding respectively.

Fig. 16, 17, 18 and 19 are respectively comprehensive schematic diagrams of a gate valve green body, a check valve green body, a flat valve green body and different valve green bodies.

Fig. 20, 21, 22 and 23 are schematic diagrams of a gate valve at a flange end of a bolted valve cover, a gate valve at a welding end of a bolted valve cover, a gate valve at a flange end of a welded valve cover and a gate valve at a welding end of a welded valve cover, which are respectively formed by flat elliptic cavity gate valve blanks.

Fig. 24, 25, 26 and 27 are schematic diagrams of a flange-end check valve of a flange valve cover, a welded-end check valve of a flange valve cover and a welded-end check valve of a welded-end check valve cover, which are respectively formed by the flat-oval cavity check valve blank.

Fig. 28, 29, 30 and 31 are schematic diagrams of an elliptical middle flange welding end flat valve, an elliptical middle flange end flat valve, a circular middle flange welding end flat valve and a circular middle flange end flat valve respectively formed by flat elliptical cavity flat valve blanks.

Detailed Description

A blank body (hereinafter called blank body) suitable for a multi-valve flat oval cavity valve cover containing a valve body and a general hydraulic forming processing method are disclosed, the shape of the blank body is designed according to the requirements of being suitable for different pressures and valves, being beneficial to forming and high in universality, the left end 11 and the right end 12 of the blank body are provided with cylindrical sections with equal diameters, the diameter D of the cylindrical sections is the same as the outer diameter D of a seamless steel pipe blank (hereinafter called pipe blank), the long axis of the flat oval middle section 13 of the blank body is larger in size and can accommodate larger opening and closing member movement in various valves, the height H of the upper part of the middle section 13 can be processed at different heights by the valves, the small cylindrical sections 14 (without check valves) are arranged at the tops of the gate valve and the flat valve, the lower parts 15 of the gate valve and the check valve are rotary bodies (the diameter is equivalent to the long axis of the middle section 13), only the flat valve is provided with the middle section 13 (height H) of the lower part, and the

Transition sections

16 and 17. The structural length L and the wall thickness t of the blank can be determined according to corresponding pressure and standards, the height H of the blank is determined according to required valves, the determined left and

right sections

11 and 12, the middle section (the flat valve comprises an upper part and a lower part) 13, the lower part 15, the top small cylindrical section 14 (the check valve is not required), and the transition section 16/17 are set to have the same wall thickness t so as to obtain the volume and the weight W of the blank, and the length L1 of the tube blank 10 with the same diameter and the same wall thickness as the left and right sections of the blank can be obtained according to the weight W. The shape of different valves with the same nominal diameter D, the wall thickness with different nominal pressures and the blank with different structure length L have different weights, a general concave mould with the same shape as the convex blank is designed according to the longest tube blank length L1 and the maximum blank height H and H, the mould consists of an upper mould 21 (corresponding to the lower part of the blank) and a lower mould 31 (corresponding to the upper part of the blank), the joint surface of the upper mould and the lower mould passes through the diameter revolving axis X axis of the blank, the symmetrical surface (hereinafter referred to as the symmetrical surface) of the mould passes through the middle section axis Z axis of the blank, the Z axis is vertically crossed with the X axis, the upper mould 21 is arranged on an upper working platform 20 which moves up and down in the press, the lower mould 31 is fixed on a lower working platform 30 of the press, the upper mould 21 is lifted up to place the tube blank 10 in the middle of the lower mould 31, the upper mould 21 is pressed on the lower mould 31 to be combined, the left pressure head 61, injecting high-pressure liquid into the tube blank 10 through holes P1 and P2 on the left pressure head 61 and the right pressure head 62, enabling the tube blank 10 to be buckled and deformed to be close to the inner walls of concave cavities of the upper and

lower dies

21 and 31, keeping pressing force by the press in the deformation process, enabling the left and

right pressure heads

61 and 62 to symmetrically perform supplementary material movement until the tube blank 10 is compressed to the structural length L required by a blank body from the length L1, keeping pressure and shaping the blank body to reach the required shape, discharging the liquid in the cavity of the blank body, withdrawing the left and

right pressure heads

61 and 62, lifting the upper die 21, and ejecting the blank body out of the lower die. For a blank body with thicker wall thickness and longer structural length, in order to prevent the lifting of an upper die 21 in the hydraulic forming process, the left end and the right end of the upper die 21 are provided with the

semi-conical ring platforms

22 and 23, the left end and the right end of a lower die 31 are provided with the

semi-conical ring platforms

32 and 33, the two left

semi-conical ring platforms

22 and 32 form a complete left end outer conical surface with a self-locking cone angle, the two right

semi-conical ring platforms

23 and 33 form a complete right end outer conical surface with a self-locking cone angle, the left end inner clamping sleeve 81 and the right end inner clamping sleeve 82 have the diameter and the cone angle matched with the left end outer conical surface and the right end outer conical surface, and the left end inner clamping sleeve 81 and. The blank of the check valve is formed by fitting the adjusting blocks 101 and 102 in the lower die 31 and the upper die 21, the blank of the gate valve can be formed by taking out the adjusting blocks 101 and 102 in the lower die 31 and the flat valve can be formed by taking out the adjusting blocks 101 and 102 in the lower die 31 and the upper die 21, respectively.

The forming method comprises the following steps:

step 1: a tube blank 10 with the length of L1, the outer diameter D and the wall thickness t equal to the diameters of the left end and the right end of the blank, the wall thickness equal to the weight is prepared, and two end surfaces of the tube blank 10 are processed to be flat for sealing.

Step 2: the left and right

pressing heads

61 and 62 return to the original positions, the left and right cutting

sleeves

81 and 82 return to the original positions, the upper die 21 is lifted, foreign matters in the lower die 31 are cleaned, and the valve blank body molded according to requirements is placed in or taken out of the adjusting block 101 in the lower die 31 and the adjusting block 102 in the upper die.

And step 3: the raw pipe 10 is placed between the lower dies 31, and the upper die 21 is pressed down.

And 4, step 4: the left and right cutting

sleeves

81 and 82 are pressed into engagement with the left and right outer conical surfaces, respectively.

And 5: the left and right

pressing heads

61 and 62 symmetrically press the two end surfaces of the tube blank 10, the left and right sealing

gaskets

51 and 52 ensure the sealing between the pressing heads and the tube blank, liquid is injected into the tube blank 10 through the holes of the left and right

pressing heads

61 and 62, gas is exhausted, high pressure in the cavity is kept, the inner cavity of the tube blank 10 is subjected to yield deformation and gradually approaches the inner walls of the cavities of the upper die 21 and the lower die 31, meanwhile, the press applies force exceeding the yield limit to the tube blank 10 through the left and right

pressing heads

61 and 62 to perform symmetrical feeding motion on a symmetrical surface until the tube blank 10 is compressed to the structural length L required by the blank, and the blank is subjected to pressure.

Step 6: and discharging the liquid in the green body cavity through the hole of the pressure head.

And 7: the left and

right rams

61 and 62 are withdrawn.

And 8: the left and

right ferrules

81 and 82 are withdrawn.

And step 9: the upper die 21 is lifted.

Step 10: the ejection column 7 ejects the formed blank out of the lower die 31, and after the blank is taken out, the ejection column 7 returns to the original position to complete the whole process.

The adjusting blocks 101 and 102 are simply replaced and disassembled, so that one set of the die is suitable for various valves such as gate valve flat valve check valves with different heights from Hmin to Hmax, and the universality of the die is improved.

The upper die and the lower die are designed and manufactured according to the longest blank body length Lmax of the same nominal diameter, and the strokes of the pressure heads 61 and 62 are controlled for the tube blank with the specific length, so that the processing of various valves with the same diameter and the blank body with the pressure structure length from Lmin to Lmax can be covered, and the universality of the die is improved.

The inner cavity of the blank body can be designed according to the thicker wall thickness required by the medium pressure and the thinner wall thickness covered by the low pressure, thereby not only being suitable for the processing of Tmin blank bodies with thinner wall thickness, but also being suitable for the processing of Tmax blank bodies with thicker wall thickness, leading the blank body to be suitable for the wall thickness requirements of valves with different pressure levels, and improving the universality of the die.

The blank body is divided into a valve body and valve cover two-section blank body at a proper position of the middle section, the divided valve body and valve cover blank body can be welded with a flat flange circular flange so as to meet the requirements of connecting different pressure bolts with a valve body and a valve cover, and can also be assembled and welded according to requirements to manufacture various valves with welded valve covers.

The blank body can be made into various flat oval cavity gate valves, including flat oval flanges or round flange bolted connection valve bonnet gate valves, all-welded valve bonnet gate valves.

The blank body can be made into various flat oval cavity check valves, including flat oval flanges or round flange bolted connection valve deck check valves, and all-welded valve deck check valves.

The blank body can be made into various flat elliptic cavity flat valves, including flat elliptic flanges or flat valves with valve covers connected by circular flanges and all-welded valve flat valves.

The end part of the blank body can be directly processed into a welding end valve according to the requirement of the connecting pipe, and also can be welded with a flange according to the requirement to manufacture a flange end connected with various valves.

According to the general hydraulic forming processing method, the left and right conical clamping sleeves can be selected for auxiliary pressing according to the specification of a blank body and the size of a press, so that the simplest machine die matching is achieved. The front clamping sleeve and the rear clamping sleeve can be adopted on the basis of the left clamping sleeve and the right clamping sleeve according to the condition, so that the forming of a high-pressure thick-wall blank is adapted, the pressure of a main pressure head of a press is greatly reduced, and the capital investment and the energy consumption in the forming process are reduced.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and modifications (e.g., a lever gate valve being changed to a concealed lever, a single gate plate being changed to a double gate plate, a check valve being changed to a block valve, a gate valve being changed to a different operation type) and the like, which are within the spirit and principle of the present invention, may be made by those skilled in the art without departing from the scope of the present invention.

Claims

1. A blank body with a flat oval cavity and a valve body and a valve cover, which is suitable for multi-valve valves, is characterized in that: the blank has the cylinder section that the diameter equals to the right-hand member about the body level, and this cylinder section diameter is fit for valve standard requirement, and the flat oval interlude size in the vertical direction of blank guarantees can be used as the installation that holds the opening and closing member motion space and the sealing member of multiple valve class, and interlude upper portion and lower part are looked the height of different valve classes and are designed, are the cylinder circular cone changeover portion that is fit for the disk seat installation in the transition department of blank interlude and left and right ends cylinder section.

2. The blank body of the flat elliptic cavity valve body-containing valve cover suitable for the multi-valve according to claim 1, is characterized in that: the diameter of the cylindrical section is the same as the outer diameter of the seamless steel pipe blank.

3. The blank body of the flat elliptic cavity valve body-containing valve cover suitable for the multi-valve according to claim 1, is characterized in that: the top of the middle section is provided with a small cylindrical section suitable for a gate valve and a flat valve; the lower part of the middle section is provided with a revolving body suitable for a gate valve and a check valve, and the diameter of the revolving body is equivalent to the long axis of the middle section.

4. The blank body of the flat elliptic cavity valve body-containing valve cover suitable for the multi-valve according to claim 1, is characterized in that: the lower part of the middle section has a lower extension adapted for a plate valve.

5. A method for forming a blank body with a flat oval cavity and a valve body and a valve cover, which is suitable for multi-valve valves, is characterized by comprising the following steps: designing a concave die with the same shape as the convex blank according to the height of the longest blank tube and the highest middle section, wherein the die consists of an upper die and a lower die, the joint surface of the upper die and the lower die passes through the drift diameter rotation axis of the blank, the symmetrical surface of the die passes through the middle section axis of the blank, two axes are vertically intersected, the upper die is arranged on an upper workbench which moves up and down by a press, and the lower die is fixed on a lower workbench of the press; lifting the upper die to place the tube blank in the middle of the lower die, pressing the upper die to the lower die for combination, pressing left and right press heads provided with sealing gaskets to two ends of the tube blank by a press, injecting high-pressure liquid into the tube blank through holes on the left and right press heads to enable the tube blank to be bent and attached to the inner wall of a cavity of the upper and lower dies, keeping pressing force by the press and enabling the left and right press heads to symmetrically perform material supplementing movement in the bending process until the tube blank is compressed to the structural length required by a blank body, shaping the blank body to the required shape through pressure maintaining, discharging liquid in the cavity of the blank body, withdrawing the left and right.

6. The method for forming the blank body of the flat elliptic cavity valve body-containing valve cover suitable for the multi-valve according to claim 5, is characterized in that: for the blank with thicker wall thickness, longer structure length and higher pressure, and thicker wall thickness, in order to prevent the lifting of the upper die in the hydraulic forming process, semi-conical ring platforms are respectively reserved at the left end and the right end of the upper die and the lower die, the semi-conical ring platforms at the left end and the right end form a complete external conical surface with a self-locking cone angle, the left end inner cutting sleeve and the right end inner cutting sleeve have the diameter and the cone angle which are matched with the left end external conical surface and the right end external conical surface, and the left end inner cutting; the seamless steel pipe is formed into a valve blank body required by valves such as a gate valve flat valve check valve and the like through different combinations of the upper die and the lower die and the upper adjusting block and the lower adjusting block.

7. The method for forming the blank body of the flat elliptic cavity valve body-containing valve cover suitable for the multi-valve according to claim 5, is characterized in that: the method comprises the following specific steps:

and 7: withdrawing the left and right pressing heads;

and 8: withdrawing the left and right cutting sleeves;

and step 9: lifting the upper die;

8. The method for forming the blank body of the flat elliptic cavity valve body-containing valve cover suitable for the multi-valve according to claim 5, is characterized in that: the blank body is divided into a valve body and valve cover two-section blank body at the middle section, and the divided valve body and valve cover blank body can be welded with a flat or round flange so as to meet the requirements of connecting the valve body and valve cover by bolts with different pressures at low and medium pressures; and various valves with welded valve covers can be manufactured by assembling and welding after the valves are machined and assembled as required.

9. The method for forming the blank body of the flat elliptic cavity valve body-containing valve cover suitable for the multi-valve according to claim 5, is characterized in that: the end part of the blank body is directly processed into a welding end valve according to the requirement of a connecting pipe; or welding flanges according to requirements to manufacture the flange end connected with various valves.