A water pump casing bulging die structure

Abstract

The utility model discloses a water pump pump shell bulging die structure relates to water pump processing field, including lower die subassembly, install lower die plate and the edge ring on lower die subassembly, the ejection part is relatively slidably worn on lower die subassembly, and the upper portion of ejection part passes the edge ring and places polyurethane elastic part, and the pump shell is detained on polyurethane elastic part, the top rod is used for extending into lower die subassembly and is toped in the bottom of ejection part, drives ejection part to move upward, the upper die subassembly installs upper die plate on the upper die subassembly, and upper die plate opens and closes the die movement relative to lower die plate, and a plurality of sliding blocks, each sliding block is relatively slidably installed in upper die plate, when upper die plate and lower die plate close the die, each sliding block is gathered to the center and forms the cavity, and the pump shell is pressed in the cavity through polyurethane elastic part. The utility model only needs to press once by oil press, and pump shell bulging can be completed, and the flange face is even, solves the problem that the material pressure of original structure is not enough, and the problem of flange face distortion, hole position deformation is eradicated.

Description

Technical Field

[0001] This utility model relates to the field of water pump processing, specifically to a water pump casing bulging mold structure. Background Technology

[0002] like Figure 1 As shown, the pump casing of a stainless steel horizontal single-stage centrifugal pump has a volute shape. This pump casing requires multiple processes such as stretching, bulging, and punching, among which the bulging process is the key process. Currently, the commonly used bulging die structure in the industry is as follows: Figure 2 As shown, the entire mold is divided into two parts: an upper mold and a lower mold. The working sequence of the entire mold is as follows: first, the pump housing to be processed (1') is placed, then the polyurethane (2') is placed into the pump housing, and then the hydraulic press is started, and the entire upper mold moves downward. When the mold moves downward, the pressure plate (3') first contacts the flange surface of the pump housing, and then the nitrogen spring (4') holds it firmly to prevent the flange surface from warping and deforming during the expansion process. Then the punch (5') holds the polyurethane, and the elastic deformation of the polyurethane is used to gradually expand the pump housing. The three-dimensional structure of the pump housing before expansion is as follows. Figure 3 As shown, the three-dimensional structure of the pump casing after expansion is as follows: Figure 4 As shown.

[0003] In existing technology, the clamping force on the pump casing flange face is insufficient during the bulging process, making the flange face prone to twisting and several holes prone to deformation. The maximum clamping force of the nitrogen springs on the mold is only around 20T~30T, which has limited effect on clamping the flange face. Therefore, a hydraulic press is needed to flatten the flange face, which is equivalent to adding a leveling process after bulging, resulting in multiple processes and long processing time. In addition, after bulging, the ejector rod pushes out the pump casing, and the polyurethane must be removed before the pump casing can be taken out, leading to low production efficiency. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a pump casing expansion mold structure. The main cylinder of the hydraulic press firmly presses the flange surface. The pump casing expansion can be completed with just one press of the hydraulic press, and the flange surface is flat. This solves the problem of insufficient pressing force in the original structure and eliminates the problems of flange surface distortion and hole deformation.

[0005] The objective of this utility model is achieved through the following technical solution: This water pump casing bulging mold structure includes: A lower mold assembly, on which a lower template and a pressure ring are mounted, with the lower template fitted around the outer periphery of the pressure ring; The ejector is slidably mounted on the lower mold assembly. The upper part of the ejector passes through the pressure ring and a polyurethane elastic element is placed there. The pump housing is fastened on the polyurethane elastic element. The ejector rod, driven by a hydraulic press, extends into the lower mold assembly and presses against the bottom of the ejector, causing the ejector to move upward. An upper mold assembly is positioned directly above the lower mold assembly. An upper template is mounted on the upper mold assembly, and the upper template moves in an opening and closing motion relative to the lower template. Several sliders are installed relatively in the upper mold plate. When the upper mold plate and the lower mold plate are closed, each slider is snapped onto the pump housing and the sliders converge toward the center to form a cavity. The pump housing is pressed into the cavity by a polyurethane elastic element to achieve expansion forming.

[0006] As a further technical solution, the upper die assembly includes an upper die base driven by a punch press, an upper clamping plate fixed on the upper die base, and an upper pad fixed on the upper clamping plate, with the upper template fixed on the upper pad.

[0007] As a further technical solution, a conical inner hole is opened in the center of the upper template, and grooves corresponding to the number of sliders are evenly opened along the circumference of the inner hole. The direction of the grooves is parallel to the generatrix of the conical inner hole. Each slider has a protrusion on its outer wall that matches the groove. The slider is inserted into the corresponding groove through the protrusion, thereby sliding along the upper template.

[0008] As a further technical solution, an end face pressure groove is opened at the lower opening of the cavity along the circumferential direction. The end face pressure groove is used to contact the flange face of the pump casing and press the flange face onto the pressure ring.

[0009] As a further technical solution, a number of pin holes are opened along the axial direction of the pressure ring for installing positioning pins, and the upper end of the positioning pin protrudes from the pin holes for alignment and positioning of the holes opened on the flange surface. The pin holes are distributed along the circumferential direction of the pressure ring.

[0010] As a further technical solution, a clearance groove is opened along the circumferential direction on the upper surface of the lower template near the pressure ring to avoid the flange face of the pump casing.

[0011] As a further technical solution, the lower mold assembly includes a lower support plate, a lower mold base supported on the lower support plate by a lower pad, a lower pad fixed on the lower mold base, a lower template fixed on the lower pad, and a pressure ring fixedly connected to the lower pad.

[0012] As a further technical solution, a lifting groove is opened at the bottom of the lower support plate for the insertion of the lifting rod.

[0013] As a further technical solution, a guide post is installed on the lower mold plate, with the upper end of the guide post protruding from the surface of the lower mold plate. A guide hole is opened on the upper mold plate at a position corresponding to the guide post. The guide post is used to cooperate with the guide hole to guide the upper mold plate and the lower mold plate when they are closed.

[0014] The beneficial effects of this utility model are as follows: 1. The pump casing is fastened onto the polyurethane elastic component with the flange face down. The main cylinder of the hydraulic press firmly presses the flange face, solving the problem of insufficient pressing force in the original structure and eliminating the problems of flange face distortion and hole deformation. There is no need to press the plate anymore. The original expansion and flattening process is changed to an expansion process. 2. The polyurethane elastic component is placed directly on the ejector rather than pressed on the pump casing. When the pump casing is being removed or placed, it is no longer necessary to manually remove and place the polyurethane elastic component continuously, saving time and improving production efficiency. 3. The pressure ring is equipped with a positioning pin, which can be aligned with the hole on the pump casing flange surface to improve the positioning accuracy during expansion. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the casing structure of an existing horizontal single-stage centrifugal pump.

[0016] Figure 2 This is a schematic diagram of the structure of an existing bulging mold.

[0017] Figure 3 This is a three-dimensional structural diagram of the expanded front pump casing.

[0018] Figure 4 This is a schematic diagram of the three-dimensional structure of the pump casing after expansion.

[0019] Figure 5 This is a cross-sectional structural diagram of the present invention.

[0020] Figure 6 for Figure 5 A magnified view of a portion of region A in the middle.

[0021] Figure 7 This is a schematic diagram of the upper template in this utility model.

[0022] Figure 8 This is a schematic diagram of the slider structure in this utility model. Figure 1 .

[0023] Figure 9 This is a schematic diagram of the slider structure in this utility model. Figure 2 .

[0024] Figure 10 This is a schematic diagram of the structure of the present invention, in which the pump housing is placed on a polyurethane elastic element (the upper mold assembly is hidden).

[0025] Explanation of reference numerals in the attached drawings: 1' pump housing to be processed, 2' polyurethane, 3' pressure plate, 4' nitrogen spring, 5' punch; 1. Upper mold base, 2. Upper clamping plate, 3. Upper pad, 4. Upper template, 5. Slider, 6. Cavity, 7. Pump housing, 8. Polyurethane elastic component, 9. Guide post, 10. Pressure ring, 11. Ejector, 12. Lower template, 13. Lower pad, 14. Lower mold base, 15. Lower pad block, 16. Lower support plate, 17. Ejector rod, 18. Clearance groove, 19. Inner hole, 20. Slide groove, 21. Guide hole, 22. Flange face, 23. Hole position, 24. End face groove, 25. Protrusion, 26. Positioning pin, 27. Lifting groove. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings: Example: As attached Figures 5-10 As shown, this pump casing bulging mold structure includes an upper mold base 1, an upper clamping plate 2, an upper pad plate 3, an upper template 4, a slider 5, a cavity 6, a pump casing 7, a polyurethane elastic element 8, a guide post 9, a pressure ring 10, an ejector 11, a lower template 12, a lower pad plate 13, a lower mold base 14, a lower pad block 15, a lower support plate 16, an ejector rod 17, a clearance groove 18, an inner hole 19, a sliding groove 20, a guide hole 21, a flange face 22, a hole position 23, an end face pressure groove 24, a protrusion 25, a positioning pin 26, and a lifting groove 27.

[0027] Reference Appendix Figure 5 The lower mold assembly includes a lower support plate 16, a lower pad 15, and a lower mold base 14. The lower mold base 14 is supported on the lower support plate 16 by the lower pad 15. The lower pad 13 is fixed on the lower mold base 14, and the lower template 12 is fixed on the lower pad 13. The pressure ring 10 is bolted to the lower pad 13, and the lower template 12 is fitted around the outer periphery of the pressure ring 10. A lifting groove 27 is provided at the bottom of the lower support plate 16, into which the push rod 17 of the hydraulic press can extend.

[0028] Furthermore, the ejector 11 is slidably mounted on the lower mold assembly. The ejector 11 passes sequentially through the lower mold base 14, the lower backing plate 13, and the lower template 12. After the upper part of the ejector 11 passes through the pressure ring 10, a polyurethane elastic element 8 is placed on the upper surface of the ejector 11. Figure 10 As shown, before bulging, the pump housing 7 is fastened onto the polyurethane elastic element 8. The ejector rod 17, driven by a hydraulic press, extends from the lifting groove 27 into the lower mold assembly and presses against the bottom of the ejector 11, causing the ejector 11 to move upward. Preferably, the ejector 11 has a clearance fit with the pressure ring 10, the lower pad 13, and the lower mold base 14, allowing them to slide relatively freely.

[0029] The upper mold assembly is positioned directly above the lower mold assembly. An upper template 4 is installed on the upper mold assembly, and the upper template 4 performs opening and closing movements relative to the lower template 12. The upper mold assembly includes an upper mold base 1 driven by a punch press, an upper clamping plate 2 fixed on the upper mold base 1, and an upper pad 3 fixed on the upper clamping plate 2. The upper template 4 is fixed on the upper pad 3.

[0030] like Figure 7 , 8 As shown in Figure 9, the four sliders 5 are all slidably installed in the upper template 4. When the upper template 4 and the lower template 12 are closed, the four sliders 5 converge towards the center to form a cavity 6. The cavity 6 is fastened to the pump housing 7, and the pump housing 7 is pressed into the cavity 6 by the polyurethane elastic element 8 to achieve bulging.

[0031] Further, see attached document. Figure 5 , 7 A conical inner hole 19 is opened in the center of the upper template 4. Four grooves 20 are evenly opened along the circumference of the inner hole 19 (the number of grooves 20 corresponds to the number of sliders 5). The direction of the grooves 20 is parallel to the generatrix of the conical inner hole 19. Each slider 5 has a protrusion 25 on its outer wall that matches the groove 20. Figure 8 As shown, the slider 5 is embedded in the corresponding groove 20 through the protrusion 25, thereby sliding along the upper template 4. It should be noted that an equalizing bolt is installed between the slider 5 and the upper pad 3 (or the upper mold base 1, in which case a countersunk hole needs to be opened on the upper mold base 1). The upper pad 3 has a countersunk hole, and the equalizing bolt passes through the countersunk hole and extends into the upper template 4 and is fixedly connected to the top of the slider 5. At the same time, a spring is also set between the upper pad 3 and the slider 5 to facilitate the slider 5 to return to its original position after the mold is opened. The equalizing bolt and the spring are standard parts that can be purchased on the market and are conventional structures that can be conceived by those skilled in the art, and are not shown in the figure.

[0032] Reference Appendix Figure 6 , 8 An end face pressing groove 24 is provided along the circumferential direction at the lower opening of the cavity 6. The end face pressing groove 24 can contact the flange face 22 of the pump housing 7 and press the flange face 22 onto the pressing ring 10. Preferably, an avoidance groove 18 is provided along the circumferential direction on the upper surface of the lower template 12 near the pressing ring 10 to avoid the flange face 22 of the pump housing 7.

[0033] like Figure 10 As shown, a number of pin holes are opened along the axial direction of the pressure ring 10, and positioning pins 26 are installed in the pin holes. The upper end of each positioning pin 26 protrudes from the pin hole so that the hole 23 opened on the flange face 22 can be aligned and positioned. The pin holes are distributed along the circumferential direction of the pressure ring 10.

[0034] Reference Appendix Figure 5 , 7 10. A guide post 9 is installed on both the left and right sides of the lower mold plate 12. The upper end of the guide post 9 protrudes from the upper surface of the lower mold plate 12. A guide hole 21 is opened on the upper mold plate 4 at the corresponding position of the guide post 9. The guide post 9 can cooperate with the guide hole 21 to guide the upper mold plate 4 and the lower mold plate 12 when they are closed.

[0035] The working process of this utility model: First, the pump housing 7 is placed on the pressure ring 10, and positioned using the holes 23 on the flange face 22 of the pump housing 7. The pump housing surrounds the polyurethane elastic element 8. As the mold descends, the slider 5 first touches the upper surface of the flange face 22. The mold continues to descend until the four sliders 5 press against the upper pad 3, and the end face groove 24 firmly presses the flange face 22 of the pump housing 7 onto the pressure ring 10. Then, the hydraulic press cylinder is activated. The cylinder, through the ejector rod 17 and the ejector 11, applies force to the polyurethane elastic element 8, causing it to deform. Under the continuous action of the ejector rod force, the polyurethane elastic element 8 continuously expands, slowly enlarging the entire pump housing 7 until the outer surface of the pump housing 7 is firmly attached to the inner cavity (i.e., cavity 6) of the slider 5. Throughout the entire process of the ejector 11 pushing upwards, the slider 5 firmly presses the flange face 22 of the pump housing 7 through the end face groove 24, thereby reducing the twisting of the flange face 22 and the deformation of the holes 23. After the top cylinder is depressurized, it descends, and the polyurethane elastic component 8 springs back to its original shape. Then, the main cylinder drives the upper mold base 1 to rise, and the slider 5 immediately disengages from the pump housing 7, allowing the workpiece (pump housing 7) to be manually removed. Compared to the original structure, which required manual removal and placement of the polyurethane component 8 for each product, the current solution eliminates the need for this process, significantly improving production efficiency and reducing manual labor intensity.

[0036] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this utility model should fall within the protection scope of the appended claims.

Claims

1. A pump casing bulging mold structure, characterized in that, include: The lower mold assembly is equipped with a lower template (12) and a pressure ring (10), and the lower template (12) is fitted around the outer periphery of the pressure ring (10); Ejector (11) is slidably mounted on the lower mold assembly. The upper part of the ejector (11) passes through the pressure ring (10) and a polyurethane elastic element (8) is placed thereon. The pump housing (7) is fastened on the polyurethane elastic element (8). The push rod (17) is driven by a hydraulic press to extend into the lower mold assembly and push against the bottom of the ejector (11), thereby driving the ejector (11) to move upward. The upper mold assembly is positioned directly above the lower mold assembly, and an upper template (4) is mounted on the upper mold assembly. The upper template (4) moves in opening and closing relative to the lower template (12). Several sliders (5) are installed in the upper template (4) in a relatively sliding manner. When the upper template (4) and the lower template (12) are closed, each slider (5) is fastened to the pump housing (7) and each slider (5) gathers towards the center to form a cavity (6). The pump housing (7) is pressed into the cavity (6) by the polyurethane elastic element (8) to achieve expansion.

2. The pump casing bulging mold structure according to claim 1, characterized in that: The upper mold assembly includes an upper mold base (1) driven by a punch press, an upper clamping plate (2) fixed on the upper mold base (1), and an upper pad plate (3) fixed on the upper clamping plate (2). The upper template (4) is fixed on the upper pad plate (3).

3. The pump casing bulging mold structure according to claim 1, characterized in that: The upper template (4) has a conical inner hole (19) at its center. Slide grooves (20) corresponding to the number of sliders (5) are evenly opened along the circumference of the inner hole (19). The direction of the slide grooves (20) is parallel to the generatrix of the conical inner hole (19). Each slider (5) has a protrusion (25) on its outer wall that matches the slide groove (20). The slider (5) is embedded in the corresponding slide groove (20) through the protrusion (25) and thus slides along the upper template (4).

4. The pump casing bulging mold structure according to claim 1, characterized in that: The lower opening of the cavity (6) is provided with an end face pressure groove (24) along the circumferential direction. The end face pressure groove (24) is used to contact the flange face (22) of the pump housing (7) and press the flange face (22) onto the pressure ring (10).

5. The pump casing bulging mold structure according to claim 1, characterized in that: A number of pin holes are opened along the axial direction of the pressure ring (10) for installing positioning pins (26), and the upper end of the positioning pin (26) protrudes from the pin holes so that the holes (23) opened on the flange face (22) can be aligned and positioned. The pin holes are distributed along the circumferential direction of the pressure ring (10).

6. The pump casing bulging mold structure according to claim 1, characterized in that: The upper surface of the lower template (12) near the pressure ring (10) has a relief groove (18) along the circumferential direction to avoid the flange face (22) of the pump casing (7).

7. The pump casing bulging mold structure according to claim 1, characterized in that: The lower mold assembly includes a lower support plate (16), a lower mold base (14) supported on the lower support plate (16) by a lower pad (15), a lower pad (13) fixed on the lower mold base (14), a lower template (12) fixed on the lower pad (13), and a pressing ring (10) fixedly connected to the lower pad (13).

8. The pump casing bulging mold structure according to claim 7, characterized in that: The bottom of the lower support plate (16) has a lifting groove (27) for the top rod (17) to extend into.

9. The pump casing bulging mold structure according to claim 1, characterized in that: The lower template (12) is equipped with a guide post (9), the upper end of the guide post (9) protrudes from the surface of the lower template (12), and a guide hole (21) is opened on the upper template (4) at the corresponding position of the guide post (9). The guide post (9) is used to cooperate with the guide hole (21) to realize the guidance when the upper template (4) and the lower template (12) are closed.

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