A pump impeller housing tower side forming mold and its use method

Abstract

The present invention relates to the field of mold technology, and discloses a pump impeller shell tower side forming mold and a method for using the same. The pump impeller shell tower side forming mold comprises: an upper mold and a lower mold, the upper mold comprising an upper mold base, an upper pad, and a fixed assembly arranged in sequence from top to bottom, a punch assembly being slidably provided on the fixed assembly, and a guide assembly connected to the upper pad being provided on the periphery of the fixed assembly; the guide assembly is provided with a guide structure that slides with the punch assembly, and the extension direction of the guide structure is perpendicular to the inner wall of the outer ring of the pump impeller shell. By using the pump impeller shell tower side forming mold and the method for using the same according to the present invention, the movement of the slider and the punch head is guided by the guide groove, so that the punch head pushes into the pump impeller shell in a direction perpendicular to the inner wall of the outer ring of the pump impeller shell. Due to the limiting effect of the U-shaped groove, the shape of the punched blind groove is the same as the shape of the stamping forming end, thereby ensuring the adaptability of the blind groove to the root of the blade, and greatly improving the connection accuracy and firmness of the blade and the pump impeller shell.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and more particularly to a pump impeller housing tower side molding mold and a use method thereof. Background Art

[0002] A torque converter is a mechanical device that relies on hydraulic components to transmit power. It converts and transmits engine torque while achieving stepless speed change and shock absorption. The impeller housing is a crucial component of the torque converter, and its manufacturing process directly impacts its performance and reliability. During production, the impeller housing requires three circles of blade-shaped slots to be stamped into its inner wall. These slots can be through slots or blind slots. These three circles, located in the inner, middle, and outer rings of the impeller housing, are used to embed the blade roots, ensuring precise installation and secure connection of the blades to the impeller housing, thereby guaranteeing the overall performance of the torque converter.

[0003] A Chinese patent with publication number CN111974883A discloses a normal angle stamping die for a torque converter pump impeller housing, comprising an upper die base and a lower die base. The lower end of the lower die base is provided with an upper pad, a first limit plate, a second limit plate, a third limit plate and a punch fixing seat in sequence. The punch fixing seat is a bowl-shaped structure, and three notches are provided on the circumference of the punch fixing seat. A stamping seat is fixed in each of the three notches, and a stamping block protrudes from the bottom of the stamping seat. The first punching block of this technology is set at an angle, and the upper template is controlled to move downward by the driving module, thereby driving the first punching block to move downward synchronously to punch the upper annular surface of the impeller housing. However, since the punching direction of the first punching block (the moving direction of the first punching block when it is pushed into the impeller housing) is vertically downward, and the impeller housing is a bowl-shaped structure, and the inner wall of the impeller housing is a curved structure, during the vertical punching process, the end face of the punching end of the first punching block forms a vertical side wall of a through hole on the impeller housing, and the vertical side wall cannot effectively constrain the blade root, and all side walls of the through hole cannot effectively constrain the upper surface of the blade root, resulting in poor mechanical interlocking effect between the blade root and the through hole. Even if the blade root is subsequently welded in the through hole of the impeller housing, since the through hole cannot accurately limit the blade root, the connection accuracy of the blade and the impeller housing is poor, which will lead to reduced working performance of the finally assembled torque converter. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects existing in the prior art and to provide a pump impeller shell tower side forming mold and its use method, which adjusts the stamping direction to be perpendicular to the inner wall of the outer ring of the pump impeller shell, so that the punched groove can also form an effective constraint on the upper surface of the blade root, thereby making the blade and the groove form a good mechanical fit, thereby improving the connection accuracy between the blade and the pump impeller shell.

[0005] To achieve the above-mentioned object, the technical solution of the present invention is to provide a pump impeller shell tower side forming die, comprising: an upper die and a lower die, the upper die comprising an upper die base, an upper pad and a fixed assembly arranged in sequence from top to bottom, a punch assembly being slidably arranged on the fixed assembly, a guide assembly connected to the upper pad being provided on the outer periphery of the fixed assembly, and a variable spacing being formed between the guide assembly and the upper pad;

[0006] The guide assembly is provided with a guide structure that slides with the punch assembly, and the extension direction of the guide structure is perpendicular to the inner wall of the outer ring of the impeller housing. The lower die is provided with a groove that cooperates with the punch assembly. When the upper die and the lower die are closed, the fixing assembly drives the punch assembly to move along the extension direction of the guide structure, and punches a groove on the inner wall of the outer ring of the impeller housing.

[0007] By using the impeller shell tower side forming die described in the present invention, the movement of the punch assembly is guided by the guide structure of the guide assembly, so that the punching direction of the punch assembly is perpendicular to the inner wall of the outer ring of the impeller shell, and the cross-sectional dimension of the part of the punch assembly that is pushed into the impeller shell is controlled to be equal to the cross-sectional dimension of the root of the blade, the adaptability of the slot and the blade is guaranteed, and the inner wall of the slot can form an effective constraint on the root of the blade, ensuring that the root of the blade can be firmly embedded in the slot of the outer ring of the impeller shell, thereby greatly improving the connection accuracy and firmness of the blade and the impeller shell.

[0008] Preferably, the groove is configured as a U-shaped groove, the slot is a blind groove, and the punch assembly cooperates with the U-shaped groove to stamp the blind groove. This design does not generate excess waste when stamping the blind groove, reduces the waste cleaning process, and saves waste cleaning costs.

[0009] Preferably, the punch assembly is arranged in a circular array with N groups around the center line of the fixed assembly. In the background art, the Chinese patent with publication number CN111974883A uses a punching method of multiple rotary punching, which has a low punching efficiency for blind slots. The design of the present application is a one-time forming method, which greatly improves the punching efficiency of blind slots.

[0010] Preferably, the punch assembly includes a punch head and an L-shaped slider, and the punch head is detachably mounted on the slider. Such a design is conducive to improving the maintenance efficiency of the punch assembly and reducing the maintenance cost of the punch assembly.

[0011] Preferably, the punch head is provided with a stamping and forming end, the stamping and forming end being inclined, the slider is provided with a mounting slot, and the punch head is mounted in the mounting slot via bolts. This design allows the punch head to be securely mounted in the mounting slot, and the stamping and forming ends of all punch heads have the same inclination angle, which is beneficial for improving the accuracy of the inclination angle of the punched blind slot.

[0012] Preferably, the fixing assembly is provided with N limiting slots, the guide structure is provided as a guide slot, the slider includes a first slider and a second slider, the first slider is slidably connected to the limiting slots, the second slider is slidably connected to the guide slots, and the mounting slot is provided on the first slider. This design enables the fixing assembly to drive the punch assembly through the sliding engagement of the first slider with the limiting slots, and the second slider with the guide slots, so that the stamped end is thrust into the impeller housing in a direction perpendicular to the inner wall of the impeller housing outer ring.

[0013] Preferably, the fixing assembly includes a fixing seat and a retaining ring. The fixing seat is fixedly connected to the bottom surface of the upper pad. The retaining ring is disposed between the fixing seat and the guide assembly and is fixedly connected to the fixing seat via a connecting column. The retaining groove is disposed on the outer ring of the fixing seat, and the inner ring of the retaining ring slides in contact with the first slider. With this design, during the separation process between the upper and lower molds, the retaining ring can drive the punch assembly, causing the stamped end to exit the blind groove in a direction perpendicular to the inner wall of the outer ring of the impeller housing, thereby facilitating the demolding of the impeller housing from the upper mold.

[0014] Preferably, a first nitrogen gas spring is fixedly mounted within the upper backing plate. The guide assembly comprises a first clamping plate, a ring plate, and a second clamping plate, arranged in order from top to bottom, enclosing the guide groove. The first clamping plate is connected to the telescopic end at the bottom of the first nitrogen gas spring, and a support block for supporting the first clamping plate is fixedly mounted on the upper backing plate. This design, through the installation of the first nitrogen gas spring, enables variable spacing between the guide assembly and the upper backing plate. The first clamping plate, the ring plate, and the second clamping plate are assembled to form a guide assembly with a guide groove, which helps reduce the manufacturing difficulty of the guide assembly and thus the production cost of the mold.

[0015] Preferably, the lower die comprises a lower die base, a lower pad, and a lower mold plate, arranged in order from bottom to top. A limiting post is fixedly mounted on the lower pad to support the second clamping plate. A receiving groove is provided at the top of the lower mold plate, adapted to the outer contour of the impeller housing. The groove is provided on the wall of the receiving groove. This design, by providing the limiting post, limits the range of downward movement of the guide assembly, thereby achieving mutual coordination among the guide assembly, punch assembly, and fixed assembly. The provision of the receiving groove provides accommodation space for the impeller housing.

[0016] Preferably, a second nitrogen spring is fixedly mounted within the lower pad, and a jacking column is slidably mounted within the lower mold plate, drivingly connected to the telescopic end of the second nitrogen spring. A polygonal locating opening is provided through the center of the impeller housing, and a locating head is mounted on the top of the jacking column to mate with the opening. With this design, the second nitrogen spring pushes the jacking column to lift the notched impeller housing, allowing for automatic demolding of the impeller housing from the lower mold plate.

[0017] Preferably, a third nitrogen gas spring is fixedly mounted within the mounting base. The telescopic end of the third nitrogen gas spring is drivingly connected to a pressing core that is slidably connected to the mounting base. The pressing core is located directly above the jacking column, and a receiving hole for the positioning head is provided at the bottom of the pressing core. With this design, the third nitrogen gas spring can push the pressing core back into place, which then separates the notched impeller housing from the mounting assembly, allowing the impeller housing and the upper mold's mounting assembly to be automatically demolded.

[0018] A method for using a pump impeller housing tower side forming mold, characterized by comprising the following steps:

[0019] S1. placing the impeller housing;

[0020] S2, the upper die moves downward, and the pressing core and the lifting column press the impeller housing;

[0021] S3, the upper die and the lower die are closed, and the punch head is pushed into the impeller housing along the extending direction of the guide groove;

[0022] S4, the upper die and the lower die are separated, and the punch head exits the impeller housing in the opposite direction of S3;

[0023] S5. Take out the impeller housing.

[0024] Such a design first fixes the impeller shell by means of a positioning head, a lifting column and a pressing core, and then punches the impeller shell, which is beneficial to improving the punching accuracy.

[0025] Preferably, the S3 comprises the following steps:

[0026] S31, the pressing core moves downward to push the impeller housing to fit the wall of the accommodating groove;

[0027] S32, the second clamping plate abuts against the limiting column;

[0028] S33, the fixing assembly moves downward, the fixing seat pushes the slider and the punch head to move along the extension direction of the guide groove, and the punching end of the punch head is pushed into the impeller shell.

[0029] This design completes the punching of the impeller shell by the punch head through the pushing action of the fixed seat on the slider.

[0030] Preferably, the S4 comprises the following steps:

[0031] S41: The fixing assembly moves upward, the second clamping plate remains in contact with the limiting column, the limiting ring pushes the slider and the punch head to move in the opposite direction of S33, and the punching end of the punch head withdraws from the slot of the impeller housing;

[0032] S42, separating the second clamping plate from the limiting column;

[0033] S43: The lifting column pushes the impeller housing upward, and the impeller housing is separated from the accommodating groove.

[0034] This design completes the reset of the punch head through the pushing effect of the limit ring on the slider.

[0035] The beneficial effects of the present invention are:

[0036] 1. By using the impeller shell tower side forming die and the use method thereof described in the present invention, the punching direction of the punching head is consistent with the extension direction of the guide groove through the cooperation of the fixing component, the punching head component and the guide component, and the movement of the slider and the punching head is guided by the guide groove, so that the punching forming end of the punching head is pushed into the impeller shell in a direction perpendicular to the inner wall of the outer ring of the impeller shell. At the same time, through the limiting effect of the U-shaped groove, the shape of the punched blind groove is the same as the shape of the punching forming end, and the size of the punching forming end is exactly the same as the size of the blade root, thereby ensuring the adaptability of the blind groove to the blade root, so that the blade can be firmly embedded in the blind groove of the outer ring of the impeller shell, greatly improving the connection accuracy and firmness of the blade and the impeller shell, thereby ensuring that the assembled torque converter has good working performance.

[0037] 2. All blind grooves on the outer ring of the impeller housing are formed by stamping at one time, which is beneficial to improving the stamping efficiency of the blind grooves, thereby greatly improving the processing efficiency of the impeller housing. When all blind grooves are stamped at one time, each blind groove is formed by a punch forming end and a corresponding U-shaped groove to ensure the size of the blind groove is accurate. The stamping of multiple blind grooves will not affect each other, which greatly improves the dimensional accuracy of all blind grooves.

[0038] 3. By setting the second nitrogen spring, the lifting column, the third nitrogen spring and the pressing core, after the impeller shell is grooving, the second nitrogen spring pushes the lifting column to lift the impeller shell, the third nitrogen spring pushes the pressing core to reset, and the pressing core pushes the impeller shell to separate from the fixed assembly. The impeller shell and the lower template and the fixed assembly can be automatically demoulded, which improves the demoulding efficiency of the impeller shell and is beneficial to the assembly line processing of the impeller shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the three-dimensional structure of the impeller housing;

[0040] Figure 2 This is a schematic diagram of the overall structure of the impeller housing tower side forming die;

[0041] Figure 3 This is a schematic diagram of the main view of the impeller housing tower side forming mold;

[0042] Figure 4 It is a side cross-sectional schematic diagram of the impeller housing tower side forming mold in the mold opening state;

[0043] Figure 5 It is a side sectional schematic diagram of the impeller housing tower side molding mold in the mold closing state;

[0044] Figure 6 It is a schematic diagram of the three-dimensional structure of the upper mold;

[0045] Figure 7 This is a schematic diagram of the upper die when viewed from above;

[0046] Figure 8 It is a schematic diagram of the three-dimensional structure of the lower mold;

[0047] Figure 9 It is a schematic diagram of the three-dimensional structure of the punch assembly;

[0048] Figure 10 It is a schematic diagram of the three-dimensional structure of the slider;

[0049] Figure 11 It is a schematic diagram of the first three-dimensional structure of the fixed component;

[0050] Figure 12 It is a schematic diagram of the second three-dimensional structure of the fixed component;

[0051] Figure 13 is a schematic side cross-sectional view of a fixed assembly;

[0052] Figure 14 yes Figure 4 A magnified view of the structure at center A;

[0053] Figure 15 1. It is a schematic diagram of the three-dimensional structure of the fixed seat;

[0054] Figure 16 1. It is a schematic diagram of the three-dimensional structure of the limiting ring;

[0055] Figure 17 It is a schematic diagram of the three-dimensional structure of the guide component;

[0056] Figure 181 is a schematic diagram of the three-dimensional structure of the first splint;

[0057] Figure 19 1 is a schematic diagram of the three-dimensional structure of the second splint;

[0058] Figure 20 It is a schematic diagram of the three-dimensional structure of the support and drag block;

[0059] Figure 21 It is a schematic diagram of the three-dimensional structure of the upper pad, the first nitrogen spring, the guide column and the guide rod;

[0060] Figure 22 It is a schematic diagram of the three-dimensional structure of the lower template.

[0061] In the figure: 100, upper die seat;

[0062] 200, upper pad; 210, first nitrogen spring; 220, support block; 221, support surface; 230, guide column; 240, first shock absorber column; 250, guide column; 260, guide rod;

[0063] 300, fixing assembly; 310, fixing seat; 311, limiting groove; 3111, first extrusion surface; 312, placement groove; 320, limiting ring; 321, second extrusion surface; 330, connecting column; 340, third nitrogen spring; 350, pressing core; 351, receiving hole;

[0064] 400, punch assembly; 410, punch head; 411, stamping end; 420, slider; 421, first slider; 4211, mounting groove; 4212, first pressure surface; 4213, second pressure surface; 422, second slider; 423, lubrication groove;

[0065] 500, guide assembly; 510, first clamping plate; 511, first guide surface; 520, ring plate; 530, second clamping plate; 531, second guide surface; 541, guide groove;

[0066] 600, lower die base;

[0067] 700, bottom plate; 710, limit column; 720, guide sleeve; 730, second shock absorber column; 740, second nitrogen spring;

[0068] 800, lower template; 810, U-shaped groove; 820, receiving groove; 830, lifting column; 840, positioning head; 850, through groove;

[0069] 900, impeller housing; 910, blind groove; 920, positioning hole; 930, protrusion. DETAILED DESCRIPTION

[0070] The subject matter described herein will now be discussed with reference to example embodiments. It should be understood that these embodiments are discussed to enable those skilled in the art to better understand and implement the subject matter described herein. The functions and arrangements of the elements discussed may be varied without departing from the scope of protection of this specification. Various examples may omit, substitute, or add various processes or components as needed. In addition, features described with respect to some examples may also be combined in other examples.

[0071] In order to better understand the present invention, Figure 1-Figure 22 A pump impeller housing tower side forming mold and a method of using the same are described in detail.

[0072] Example 1:

[0073] like Figures 1-8 As shown, a pump impeller shell tower side forming die includes: an upper die and a lower die, the upper die includes an upper die base 100, an upper pad 200 and a fixing assembly 300 arranged in sequence from top to bottom, a punch assembly 400 is slidably arranged on the fixing assembly 300, and a guide assembly 500 connected to the upper pad 200 is provided on the periphery of the fixing assembly 300, and a variable distance is formed between the guide assembly 500 and the upper pad 200;

[0074] The guide assembly 500 is provided with a guide structure that slides with the punch assembly 400. The extension direction of the guide structure is perpendicular to the inner wall of the outer ring of the impeller housing 900. The lower mold is provided with a groove that cooperates with the punch assembly 400. When the upper mold and the lower mold are closed, the fixing assembly 300 drives the punch assembly 400 to move along the extension direction of the guide structure, and punches out a groove on the inner wall of the outer ring of the impeller housing 900.

[0075] It should be noted that, in the process of closing the upper die and the lower die, first, the upper die holder 100 drives the upper pad 200, the fixing assembly 300, the punch assembly 400 and the guide assembly 500 to move downward synchronously; when the guide assembly 500 abuts against the lower die, the guide assembly 500 stops moving downward, and the upper die holder 100 drives the upper pad 200 and the fixing assembly 300 to continue moving downward, and the distance between the upper pad 200 and the guide assembly 500 gradually decreases, and the fixing assembly 300 pushes the punch assembly 400 to continue moving. Under the guiding action of the guide structure, the moving direction of the punch assembly 400 changes, and the punch The component 400 moves along the extension direction of the guide structure and slides relative to the fixed component 300, that is, the punch component 400 moves in a direction perpendicular to the inner wall of the outer ring of the impeller shell 900 until the upper mold and the lower mold are completely closed. At this time, at least a part of the punch component 400 is pushed into the impeller shell 900, thereby punching out a groove on the inner wall of the outer ring of the impeller shell 900. During this process, the stamping direction of the punch component 400 is perpendicular to the inner wall of the outer ring of the impeller shell 900 and is consistent with the depth direction of the groove; the blade root and the groove of the impeller shell 900 are firmly connected by interference fit or transition fit.

[0076] In this embodiment, the upper pad 200 is fixedly installed on the bottom surface of the upper die base 100, and the fixing assembly 300 is fixedly installed on the side of the upper pad 200 away from the upper die base 100; the cross-sectional dimension of the part of the punch assembly 400 that is pushed into the impeller shell 900 is equal to the cross-sectional dimension of the blade root, and the stamped groove is fully adapted to the blade root. When the blade root is embedded in the groove, the inner wall of the groove fits tightly with the surface of the blade root. Two opposite side walls of the groove form effective constraints on the upper and lower surfaces of the blade root, and the other two opposite side walls of the groove form effective constraints on the two opposite side surfaces of the blade root. The mechanical fitting effect of the blade root and the groove is good, the connection accuracy of the blade and the impeller shell is high, the blade root is firmly embedded in the groove, and the blade is not easily separated from the impeller shell 900.

[0077] By using a pump impeller shell tower side forming mold of the present invention, the movement of the punch assembly 400 is guided by the guide structure of the guide assembly 500, so that the punching direction of the punch assembly 400 is perpendicular to the inner wall of the outer ring of the pump impeller shell 900. By controlling the cross-sectional size of the part of the punch assembly 400 that is pushed into the pump impeller shell 900 to be equal to the cross-sectional size of the blade root, the adaptability of the slot and the blade is guaranteed, and the inner wall of the slot can form an effective constraint on the blade root, ensuring that the blade root can be firmly embedded in the slot of the outer ring of the pump impeller shell 900, thereby greatly improving the connection accuracy and firmness of the blade and the pump impeller shell 900.

[0078] Example 2:

[0079] As an optimization of Example 1, Figure 1As shown, the groove is configured as a U-shaped groove 810 , the clamping groove is a blind groove 910 , and the punch assembly 400 cooperates with the U-shaped groove 810 to stamp and form the blind groove 910 .

[0080] The U-shaped groove 810 is formed on the outer wall of the impeller shell 900 and the U-shaped groove 810 is formed on the outer wall of the outer ring of the impeller shell 900. The protrusion 930 is accommodated in the U-shaped groove 810, and the outer surface of the protrusion 930 is completely fitted with the inner wall of the U-shaped groove 810. The U-shaped groove 810 limits the formation of the protrusion 930. The shape of the protrusion 930 is limited by the inner wall of the U-shaped groove 810 to ensure that the inner wall of the blind groove 910 is completely fitted with the part of the punch assembly 400 that is pushed into the impeller shell 900. Therefore, the shape of the blind groove 910 is the same as the shape of the part of the punch assembly 400 that is pushed into the impeller shell 900, thereby improving the accuracy of the blind groove 910, improving the accuracy of the blind groove 910 in limiting the root position of the blade, and improving the connection accuracy between the blade and the impeller shell 900.

[0081] If the slot formed after stamping is a through slot, after the blade root is embedded in the through slot, the area where the blade root and the through slot are embedded needs to be welded to close the gap between the blade root and the through slot to ensure sealing, thereby preventing oil leakage during operation. The welding process of the blade and the impeller shell is very complicated and time-consuming and labor-intensive. By designing the slot formed after stamping as a blind slot 910 with a non-penetrating structure, after the blade root is embedded in the blind slot 910, sealing can be ensured without welding, and no excess waste will be generated when the blind slot 910 is stamped out, so there is no need for corresponding cleaning, which reduces the waste cleaning process and saves the cost required for waste cleaning.

[0082] In this embodiment, the size of the part of the punch assembly 400 that is pushed into the impeller housing 900 is exactly the same as the size of the root of the blade, thereby ensuring that the blind groove 910 formed by stamping is fully adapted to the root of the blade, ensuring that the root of the blade can be firmly embedded in the blind groove 910 of the outer ring of the impeller housing 900.

[0083] Example 3:

[0084] As an optimization of Example 2, Figure 6 and Figure 7 As shown, there are N groups of punch assemblies 400 distributed in a circular array around the center line of the fixing assembly 300 , and the value of N is the same as the number of blind grooves 910 punched on the outer ring of the impeller shell 900 .

[0085] It should be noted that the lower die is also provided with N U-shaped grooves 810, and the N U-shaped grooves 810 correspond one-to-one to the N sets of punch assemblies 400. This design is conducive to improving the stamping efficiency of the blind grooves 910, thereby improving the processing efficiency of the impeller shell 900.

[0086] When the value of N is less than the number of blind grooves 910 required to be punched on the outer ring of the impeller housing 900, the impeller housing 900 is punched once, rotated by a preset angle, and then punched again until a circle of blind grooves 910 is formed through multiple punching operations.

[0087] When the value of N is the same as the number of blind grooves 910 required to be punched on the outer ring of the impeller housing 900, all the blind grooves 910 on the outer ring of the impeller housing 900 are formed by one stamping. In addition, when all the blind grooves 910 are stamped at one time, each blind groove 910 is ensured to have a precise size through a punch assembly 400 and a corresponding U-shaped groove 810. The stamping of multiple blind grooves 910 will not affect each other, and the accuracy of the blind grooves 910 is higher.

[0088] Compared with the Chinese patent with announcement number CN111974883A in the background technology, the stamping method is multiple rotary stamping. Due to the intermittent rotary operation, it will inevitably lead to cumulative errors, and thus the processing accuracy of the final slot position cannot be guaranteed. In addition, the gradual stamping will cause the deformation of the previous slot, which is also the reason for the deterioration of the slot accuracy. The slot of this application is integrally formed and will not have the above-mentioned errors.

[0089] Example 4:

[0090] As an optimization of Example 3, Figure 9 As shown, the punch assembly 400 includes a punch head 410 and an L-shaped slider 420 , and the punch head 410 is detachably mounted on the slider 420 .

[0091] It should be noted that the slider 420 drives the punch head 410 to punch out the blind groove 910 on the inner wall of the outer ring of the impeller housing 900 through sliding cooperation with the fixing assembly 300 and the guide structure. The punch head 410 can be detachably mounted on the slider 420 by means of threaded connection, pin connection, bolt connection, etc. When the punch head 410 is severely worn or damaged, resulting in the punch head 410 being unable to punch out the blind groove 910 of the preset size, it is only necessary to remove the corresponding punch head 410 and replace it with a new one. On the one hand, the punch assembly 400 is in sliding cooperation with both the fixed assembly 300 and the guide structure of the guide assembly 500. The difficulty of disassembling the punch assembly 400 is much greater than the difficulty of disassembling the punch head 410. Such a design is conducive to reducing the time required for maintaining the punch assembly 400 and improving the maintenance efficiency of the punch assembly 400. On the other hand, there is no need to replace the punch assembly 400 as a whole. Only the punch head 410 that is severely worn or damaged needs to be replaced, which is conducive to reducing the maintenance cost of the punch assembly 400.

[0092] In this embodiment, the surfaces of the slider 420 that contact the fixed component 300 and the guide structure are all provided with X-shaped lubrication grooves 423 to facilitate the flow of lubricant into the lubrication grooves 423 to lubricate the surfaces of the slider 420 that contact the fixed component 300 and the guide structure, thereby reducing the friction between the slider 420 and the fixed component 300 and the guide component 500, thereby reducing the wear of the slider 420 and increasing the service life of the slider 420.

[0093] Example 5:

[0094] As an optimization of Example 4, Figure 9 and Figure 10 As shown, the punching head 410 is provided with a punching and forming end 411, the punching and forming end 411 is set obliquely, the slider 420 is provided with a mounting groove 4211, and the punching head 410 is installed in the mounting groove 4211 by bolts.

[0095] It should be noted that the stamping end 411 is the portion of the punch assembly 400 that pushes into the impeller housing 900. The size of the stamping end 411 is the same as that of the blade root. The stamping end 411 is tilted, thereby punching out an inclined blind groove 910 on the inner wall of the outer ring of the impeller housing 900.

[0096] By means of bolt connection, the punching head 410 can be firmly installed in the mounting groove 4211, and the disassembly and assembly of the punching head 410 is very convenient. In addition, the punching head 410 is fixed in the mounting groove 4211 by bolts, which can ensure that during the stamping process, the inclination angle of the stamping forming end 411 remains unchanged, and the inclination angles of the stamping forming ends 411 of all punching heads 410 are the same, thereby ensuring that the inclination angles of all blind grooves 910 punched out on the inner wall of the outer ring of the impeller housing 900 are the same, which is beneficial to improving the accuracy of the inclination angles of the stamped blind grooves 910.

[0097] Example 6:

[0098] As an optimization of Example 5, Figure 4 、 Figure 5 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 、 Figure 13 and Figure 14 As shown, the fixing assembly 300 is provided with N limiting grooves 311, the guide structure is provided as a guide groove 541, the slider 420 includes a first slider 421 and a second slider 422, the first slider 421 is slidingly connected to the limiting groove 311, the second slider 422 is slidingly connected to the guide groove 541, and the installation groove 4211 is provided on the first slider 421.

[0099] It should be noted that, when the guide assembly 500 does not contact the lower mold, the fixed assembly 300, the guide assembly 500 and the slider 420 move synchronously, and the three do not slide relative to each other; in the process of closing the upper mold and the lower mold, when the guide assembly 500 abuts against the lower mold, the guide assembly 500 stops moving, and the position of the guide groove 541 remains unchanged. Since the second slider 422 is slidably connected to the guide groove 541, the second slider 422 can only move along the extension direction of the guide groove 541. When the fixed assembly 300 continues to move downward, the fixed assembly 300 passes through the limit groove 3 11, the inner wall of the impeller housing 900 squeezes the first slider 421, and under the guidance of the guide groove 541, the first slider 421 and the second slider 422 both move along the extension direction of the guide groove 541, and the first slider 421 drives the punch head 410 to move synchronously, so that the stamping forming end 411 of the punch head 410 is pushed into the impeller housing 900 in a direction perpendicular to the inner wall of the outer ring of the impeller housing 900. During this process, the first slider 421 and the limiting groove 311 slide relative to each other, and the N group of punch assemblies 400 expand outward as a whole, thereby punching out a circle of blind grooves 910 on the inner wall of the outer ring of the impeller housing 900.

[0100] In this embodiment, the second slider 422 and the punching head 410 are both arranged perpendicular to the first slider 421, the limiting groove 311 is provided with a first extrusion surface 3111, the first slider 421 includes a first pressure surface 4212 and a second pressure surface 4213 arranged opposite to each other, the first pressure surface 4212 slidably fits the first extrusion surface 3111, and the other two oppositely arranged side surfaces of the first slider 421 slidably fits the two oppositely arranged side walls of the limiting groove 311, the second slider 422 is perpendicular to the first extrusion surface 3111, the angle between the first extrusion surface 3111 and the vertical direction is α, the angle between the extension direction of the guide groove 541 and the vertical direction is β, and the relationship α+β=90° is satisfied, and the stamping end 411 protrudes from the second pressure surface 4213;

[0101] The fixing component 300 squeezes the first pressure surface 4212 of the first slider 421 through the first extrusion surface 3111. The force of the fixing component 300 on the first slider 421 is perpendicular to the first pressure surface 4212. That is, the driving force generated by the fixing component 300 on the punch assembly 400 is parallel to the stamping direction of the punch head 410. With this design, the driving force of the fixing component 300 on the punch assembly 400 can be more effectively applied to the stamping forming end 411 of the punch head 410 to push into the impeller shell 900.

[0102] Example 7:

[0103] As an optimization of Example 6, Figure 4 、 Figure 5 、 Figure 11 、 Figure 12 、 Figure 13 、 Figure 15and Figure 16 As shown, the fixing assembly 300 includes a fixing seat 310 and a limiting ring 320. The fixing seat 310 is fixedly connected to the bottom surface of the upper pad 200. The limiting ring 320 is arranged between the fixing seat 310 and the guide assembly 500, and the limiting ring 320 is fixedly connected to the fixing seat 310 through the connecting column 330. The limiting groove 311 is arranged on the outer ring of the fixing seat 310, and the inner ring of the limiting ring 320 slides in fit with the first slider 421.

[0104] It should be noted that the fixing seat 310 is configured as a truncated cone structure, the top end surface of the fixing seat 310 is fixedly connected to the upper pad 200, the bottom end surface of the fixing seat 310 is smaller than the top end surface of the fixing seat 310, and the limiting ring 320 is provided with a second extrusion surface 321, which slidably fits the second pressure surface 4213 of the first slider 421, thereby restricting the first slider 421, so that the first slider 421 can only move along the length direction of the limiting groove 311 and will not fall off from the limiting groove 311;

[0105] After the blind groove 910 is stamped, during the process of separating the upper die from the lower die, first, before the guide assembly 500 is separated from the lower die, the upper die holder 100 drives the upper pad 200 and the fixed assembly 300 to move upward, and the second extrusion surface 321 of the limit ring 320 squeezes the second pressure surface 4213 of the first slider 421. Under the guidance of the guide groove 541, the first slider 421 and the second slider 422 both move along the extension direction of the guide groove 541, and the first slider 421 drives the punching head 410 to move synchronously. The punch head 410 is moved so that the stamping end 411 of the punch head 410 withdraws from the blind groove 910 in a direction perpendicular to the inner wall of the outer ring of the impeller shell 900. During this process, the first slider 421 slides relative to the limiting groove 311, and the N group of punch assemblies 400 shrinks inward as a whole, and all the stamping ends 411 withdraw from the blind groove 910; when the guide assembly 500 is separated from the lower die, the upper die seat 100 drives the upper pad 200, the fixing assembly 300, the punch assembly 400 and the guide assembly 500 to move upward synchronously.

[0106] In this embodiment, when the upper mold and the lower mold are closed, the outer ring surface of the bottom of the limit ring 320 fits with the inner ring surface of the top opening of the impeller shell 900. During the process of closing the upper mold and the lower mold, the bottom of the limit ring 320 enters the opening at the top of the impeller shell 900. The limit ring 320 can maintain the size and roundness of the top opening of the impeller shell 900 by matching the outer ring of the bottom with the size of the top opening of the impeller shell 900, and prevent the opening at the top of the impeller shell 900 from deforming and shrinking during the process of the punch head 410 punching out the blind groove 910 on the inner wall of the outer ring of the impeller shell 900.

[0107] Example 8:

[0108] As an optimization of Example 7, Figure 4 、 Figure 5 、 Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 and Figure 21 As shown, the first nitrogen spring 210 is fixedly installed in the upper pad 200, and the guide assembly 500 includes a first clamping plate 510, a ring plate 520, and a second clamping plate 530 arranged in sequence from top to bottom to form a guide groove 541. The first clamping plate 510 is connected to the telescopic end at the bottom of the first nitrogen spring 210, and the upper pad 200 is fixedly installed with a support block 220 for supporting the first clamping plate 510.

[0109] It should be noted that the first nitrogen spring 210 is driven and connected to the first clamping plate 510. In the mold opening state, the first nitrogen spring 210 drives the first clamping plate 510 to separate from the upper pad 200 and to be at the maximum distance. By providing the first nitrogen spring 210, the distance between the guide assembly 500 and the upper pad 200 can be variable. During the process of closing the upper mold and the lower mold, after the guide assembly 500 abuts against the lower mold, the guide assembly 500 is subjected to a supporting force from bottom to top. When the supporting force is transmitted to the first nitrogen spring 210, the first nitrogen spring 210 is compressed, and the distance between the guide assembly 500 and the upper pad 200 is reduced. During the process of parting the upper mold and the lower mold, before the guide assembly 500 is separated from the lower mold, the first nitrogen spring 210 extends, and the distance between the guide assembly 500 and the upper pad 200 is increased.

[0110] The top of the ring plate 520 is fixedly connected to the first clamping plate 510, and the bottom of the ring plate 520 is fixedly connected to the second clamping plate 530. In the mold open state, the support block 220 supports the entire guide assembly 500 by supporting the first clamping plate 510. At this time, there is no compressive stress between the slider 420 and the guide assembly 500, and the slider 420 is not easily deformed or damaged.

[0111] In this embodiment, the first clamping plate 510 and the second clamping plate 530 are both annular structures. The first clamping plate 510 is provided with a first guide surface 511, and the second clamping plate 530 is provided with a second guide surface 531. The angles between the first guide surface 511 and the second guide surface 531 and the vertical direction are both β. The first guide surface 511, the second guide surface 531 and the inner circle of the ring plate 520 are enclosed to form a guide groove 541. The upper surface of the second slider 422 is in sliding contact with the first guide surface 511, and the lower surface of the second slider 422 is in sliding contact with the second guide surface 531. 1 Sliding fit; the support block 220 is provided with a support surface 221. In the mold open state, the support surface 221 abuts against the annular bottom surface of the first clamping plate 510, thereby supporting the first clamping plate 510; the upper pad 200 is fixedly installed with a guide column 250 and a guide rod 260 that slide with the first clamping plate 510. By providing the guide column 250 and the guide rod 260, the first clamping plate 510 is restricted to move up and down relative to the upper pad 200 in the vertical direction, thereby ensuring the stability of the guide assembly 500 and the upper pad 200 when they move relative to each other.

[0112] By providing the first clamping plate 510 , the ring plate 520 and the second clamping plate 530 , the three are assembled to form a guide assembly 500 having a guide groove 541 , which helps to reduce the manufacturing difficulty of the guide assembly 500 and thus reduce the production cost of the mold.

[0113] Example 9:

[0114] As an optimization of Example 8, Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 8 and Figure 22 As shown, the lower mold includes a lower mold base 600, a lower pad 700 and a lower mold plate 800 arranged in sequence from bottom to top, a limiting column 710 for supporting the second clamping plate 530 is fixedly installed on the lower pad 700, and a receiving groove 820 adapted to the outer contour of the impeller shell 900 is provided on the top of the lower mold plate 800, and the groove is provided on the groove wall of the receiving groove 820.

[0115] It should be noted that, during the process of closing the upper mold and the lower mold, after the second clamping plate 530 contacts the limiting column 710, the limiting column 710 supports the second clamping plate 530, so that the guide assembly 500 stops moving downward, while the first nitrogen spring 210 continues to move downward with the upper mold base 100, and the first nitrogen spring 210 is compressed; during the process of separating the upper mold and the lower mold, before the elastic potential energy stored by the compression of the first nitrogen spring 210 is completely released, that is, before the first nitrogen spring 210 returns to its initial length, the first nitrogen spring 210 pushes the first clamping plate 510, so that the second clamping plate 530 of the guide assembly 500 is always in contact with the limiting column 710, and the upper mold base 100 can only drive the upper pad 200 and the fixing assembly 300 to move upward.

[0116] By setting a receiving groove 820 that is adapted to the outer contour of the impeller housing 900, when the upper mold and the lower mold are closed, the receiving groove 820 can provide an accommodating space for the impeller housing 900, and at least a portion of the groove wall of the receiving groove 820 fits the outer contour of the impeller housing 900 to provide support for the impeller housing 900.

[0117] In this embodiment, the groove is a U-shaped groove 810, that is, the U-shaped groove 810 is arranged on the groove wall of the accommodating groove 820, and the upper pad 200 is fixedly installed with a guide column 230 on the side close to the lower pad 700, and the lower pad 700 is fixedly installed with a guide sleeve 720 that slides and guides with the guide column 230 on the side close to the upper pad 200. There are four guide columns 230 and four guide sleeves 720, and they correspond one to one. The four guide columns 230 are fixedly installed at the four corners of the upper pad 200, and the four guide sleeves 720 are fixedly installed at the four corners of the lower pad 700. In the process of closing the upper mold and the lower mold, the guide sleeves 720 guide the guide columns 230, thereby ensuring the accuracy and stability of the closing of the upper mold and the lower mold.

[0118] Four first shock-absorbing columns 240 are also fixedly installed on the side of the upper pad 200 close to the lower pad 700, and the four first shock-absorbing columns 240 are symmetrically arranged about the symmetrical plane of the upper pad 200. Four second shock-absorbing columns 730 are fixedly installed on the side of the lower pad 700 close to the upper pad 200, and the second shock-absorbing columns 730 correspond one-to-one to the first shock-absorbing columns 240. When the upper mold and the lower mold are closed, the first shock-absorbing columns 240 and the second shock-absorbing columns 730 contact and elastically deform, and absorb the impact energy of the closing of the upper mold and the lower mold, reduce the damage to the mold caused by the impact energy, and help to improve the service life of the mold.

[0119] Example 10:

[0120] As an optimization of Example 9, Figure 1 、 Figure 4 、 Figure 5 、 Figure 8 and Figure 22 As shown, a second nitrogen spring 740 is fixedly installed in the lower pad 700, a lifting column 830 that is drive-connected to the telescopic end at the top of the second nitrogen spring 740 is slidably installed in the lower template 800, a polygonal positioning opening 920 is provided through the center of the impeller shell 900, and a positioning head 840 that is adapted to the positioning opening 920 is installed on the top of the lifting column 830.

[0121] It should be noted that the lower template 800 is a cylindrical structure. A through groove 850 is provided in the center of the lower template 800, which is slidably matched with the lifting column 830, and the through groove 850 is connected to the receiving groove 820. In the mold open state, the second nitrogen spring 740 lifts the lifting column 830, and at least a portion of the lifting column 830 protrudes from the inner wall of the receiving groove 820. When the impeller shell 900 to be punched is placed on the lifting column 830, the positioning head 840 passes through the positioning port 920 of the impeller shell 900 to position the impeller shell 900, and the impeller shell 900 does not directly contact the lower template 800.

[0122] During the process of closing the upper mold and the lower mold, the upper mold moves downward and presses the impeller shell 900 to be grooved together with the lifting column 830, and the downward movement of the upper mold will push the impeller shell 900 to be grooved, the lifting column 830 and the positioning head 840 to move downward synchronously until the impeller shell 900 to be grooved is in contact with the groove wall of the accommodating groove 820. During this process, the second nitrogen spring 740 is compressed; during the process of separating the upper mold and the lower mold, the second nitrogen spring 740 extends, pushing the lifting column 830 to reset, and lifting the impeller shell 900 that has been grooved, so that the impeller shell 900 and the lower mold plate 800 of the lower mold can be automatically demolded.

[0123] In this embodiment, the value of N is the same as the number of blind grooves 910 required to be stamped on the outer ring of the impeller housing 900. All blind grooves 910 are stamped and formed at one time. The positioning opening 920 is a pentagonal structure, and the connection between adjacent edges is provided with rounded corners. The positioning head 840 is a pentagonal column adapted to the positioning opening 920, and the top of the positioning head 840 is provided with a chamfer. When the impeller housing 900 is placed on the lifting column 830, it is beneficial for the positioning head 840 to pass through the positioning opening 920 to position the impeller housing 900, prevent the impeller housing 900 from rotating, and ensure the stability of the stamping process.

[0124] Example 11:

[0125] As an optimization of Example 10, Figure 4 、 Figure 5 、 Figure 6 and Figure 12 As shown, a third nitrogen spring 340 is fixedly installed in the fixed seat 310, and the telescopic end at the bottom of the third nitrogen spring 340 is fixedly connected to a pressing core 350 that is slidably connected to the fixed seat 310. The pressing core 350 is located directly above the lifting column 830, and a receiving hole 351 for accommodating the positioning head 840 is provided at the bottom of the pressing core 350.

[0126] It should be noted that a placement groove 312 is provided at the center of the bottom of the fixing seat 310 for sliding cooperation with the pressing core 350. In the mold open state, the third nitrogen spring 340 pushes at least a portion of the pressing core 350 out of the placement groove 312. In the process of closing the upper mold and the lower mold, and before the second clamping plate 530 abuts against the limiting column 710, the pressing core 350 first contacts the impeller shell 900 to be punched on the jacking column 830, and the pressing core 350 and the jacking column 830 jointly press the impeller shell 900 to be punched. As the mold is closed, the second nitrogen spring 740 and the third nitrogen spring 340 are both compressed, and the pressing core 350 and the jacking column 830 keep pressing the impeller shell 900 to be punched, thereby ensuring the stability of the impeller shell 900 to be punched.

[0127] The cross-sectional area of the telescopic end of the second nitrogen spring 740 is smaller than the cross-sectional area of the telescopic end of the third nitrogen spring 340. During the closing process of the upper and lower molds, the compression of the second nitrogen spring 740 is greater than the compression of the third nitrogen spring 340. Before the stamping end 411 of the punch head 410 pushes into the impeller shell 900, the lifting column 830 is completely pressed into the through groove 850. At this time, the outer contour of the impeller shell 900 is aligned with the accommodating groove 820. The lower mold plate 800 and the lifting column 830 cooperate with the pressing core 350 to press the impeller shell 900. After that, the upper mold continues to move downward, and the stamping end 411 of the punch head 410 pushes into the impeller shell 900.

[0128] During the process of separating the upper mold and the lower mold, the extension of the third nitrogen spring 340 pushes the pressing core 350 to reset, and the pressing core 350 pushes the impeller shell 900 that has been grooved to separate from the fixed component 300, and the impeller shell 900 and the fixed component 300 of the upper mold can be automatically demolded.

[0129] Example 12:

[0130] A method for using a pump impeller housing tower side forming mold, characterized by comprising the following steps:

[0131] S1. Place the impeller housing 900;

[0132] S2, the upper die moves downward, and the pressing core 350 and the lifting column 830 press the impeller housing 900;

[0133] S3, the upper mold and the lower mold are closed, and the punch head 410 is pushed into the impeller housing 900 along the extending direction of the guide groove 541;

[0134] S4, the upper die and the lower die are separated, and the punch head 410 exits the impeller housing 900 in the opposite direction of S3;

[0135] S5. Take out the impeller housing 900.

[0136] It should be noted that, in S1, when placing the impeller shell 900, the impeller shell 900 is placed on the lifting column 830 to provide support for the impeller shell 900, and the positioning head 840 is passed through the positioning port 920, and the positioning head 840 is used to restrict the impeller shell 900 from moving in the horizontal direction, and the impeller shell 900 is prevented from rotating; in S2, the pressing core 350 abuts against the impeller shell 900 as the upper mold moves downward, and the pressing core 350 and the lifting column 830 restrict the impeller shell 900 from moving in the vertical direction; the impeller shell 900 is first fixed by the positioning head 840, the lifting column 830 and the pressing core 350, and then the impeller shell 900 is stamped, which is conducive to improving the stamping accuracy.

[0137] Example 13:

[0138] As an optimization of Example 12, S3 includes the following steps:

[0139] S31, the pressing core 350 moves downward, pushing the impeller housing 900 to fit the groove wall of the accommodating groove 820;

[0140] S32: The second clamping plate 530 abuts against the limiting post 710;

[0141] S33 , the fixing seat 310 moves downward, pushing the slider 420 and the punch head 410 to move along the extending direction of the guide groove 541 , and the punching end 411 of the punch head 410 pushes into the impeller housing 900 .

[0142] It should be noted that in S31, the second nitrogen spring 740 and the third nitrogen spring 340 are both compressed. In S32, the pressing core 350 stops moving, and the guide assembly 500 continues to move downward with the upper die until the second clamping plate 530 abuts against the limiting post 710. During this process, the third nitrogen spring 340 is compressed. S31 and S32 can be completed simultaneously, that is, when the pressing core 350 moves downward with the upper die to push the impeller housing 900 downward, so that the impeller housing 900 fits against the groove wall of the accommodating groove 820, the second clamping plate 530 completes the abutment with the limiting post 710.

[0143] In S33, the first nitrogen spring 210 and the third nitrogen spring 340 are both compressed, and the fixed seat 310 squeezes the first pressure surface 4212 of the first slider 421 through the first extrusion surface 3111 of the limiting groove 311, thereby pushing the first slider 421 and the second slider 422 to move. Under the guiding action of the guide groove 541 on the second slider 422, the first slider 421 and the second slider 422 both move along the extension direction of the guide groove 541, and the second slider 422 moves in the direction of deepening into the guide groove 541. The first slider 421 moves synchronously with the second slider 422 and slides relative to the fixed seat 310. The first slider 421 drives the punch head 410 to move synchronously, so that the stamping end 411 of the punch head 410 is pushed into the impeller housing 900 in a direction perpendicular to the inner wall of the outer ring of the impeller housing 900, and a blind groove 910 is punched out on the impeller housing 900.

[0144] Example 14:

[0145] As an optimization of Example 13, S4 includes the following steps:

[0146] S41: The fixing assembly 300 moves upward, the second clamping plate 530 remains in contact with the limiting column 710, and the limiting ring 320 pushes the slider 420 and the punch head 410 to move in the opposite direction of S33, and the stamping end 411 of the punch head 410 withdraws from the slot of the impeller housing 900;

[0147] S42, the second clamping plate 530 is separated from the limiting column 710;

[0148] S43 , the lifting column 830 pushes the impeller housing 900 upward, and the impeller housing 900 is separated from the accommodating groove 820 .

[0149] It should be noted that in S41, during the upward movement of the fixing assembly 300, the first nitrogen spring 210 and the third nitrogen spring 340 are both extended. The first nitrogen spring 210 pushes the guide assembly 500, so that the second clamping plate 530 is kept in contact with the limiting column 710. The third nitrogen spring 340 pushes the pressing core 350, so that the pressing core 350 is kept in contact with the impeller shell 900, and the impeller shell 900 is kept in contact with the groove wall of the accommodating groove 820. The engaging groove is a blind groove 910, that is, the stamping end 411 of the punch head 410 withdraws from the blind groove 910 of the impeller shell 900.

[0150] In S41, the limiting ring 320 squeezes the second pressure surface 4213 of the first slider 421 through the second extrusion surface 321, thereby pushing the first slider 421 and the second slider 422 to move. Under the guiding action of the guide groove 541 on the second slider 422, the first slider 421 and the second slider 422 both move along the extension direction of the guide groove 541, and the second slider 422 moves in the direction of exiting the guide groove 541. The first slider 421 moves synchronously with the second slider 422 and slides relative to the fixing seat 310. The first slider 421 drives the punch head 410 to move synchronously, so that the stamping end 411 of the punch head 410 exits the blind groove 910 of the impeller housing 900 in a direction perpendicular to the inner wall of the outer ring of the impeller housing 900.

[0151] In S42, the pressing core 350 remains stationary and the third nitrogen spring 340 extends. In S43, the second nitrogen spring 740 and the third nitrogen spring 340 both extend until the impeller shell 900 is separated from the pressing core 350. S42 and S43 can be started simultaneously, that is, when the second clamping plate 530 is separated from the limiting column 710, the lifting column 830 lifts the impeller shell 900 to separate the impeller shell 900 from the accommodating groove 820.

[0152] The embodiments of the invention are described above in conjunction with the accompanying drawings, but this embodiment is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this embodiment, ordinary technicians in this field can also make many forms without departing from the purpose of this embodiment and the scope of protection of the claims, all of which are protected by this embodiment.

Claims

1. A pump impeller shell tower side forming mold, comprising: An upper die and a lower die, characterized in that the upper die comprises an upper die base (100), an upper pad (200) and a fixed assembly (300) arranged in sequence from top to bottom, a punch assembly (400) is slidably arranged on the fixed assembly (300), a guide assembly (500) connected to the upper pad (200) is arranged on the periphery of the fixed assembly (300), and a variable spacing is formed between the guide assembly (500) and the upper pad (200); The guide assembly (500) is provided with a guide structure that is slidably matched with the punch assembly (400), the extension direction of the guide structure is perpendicular to the inner wall of the outer ring of the impeller housing (900), the lower die is provided with a groove that is matched with the punch assembly (400), and when the upper die and the lower die are closed, the fixing assembly (300) drives the punch assembly (400) to move along the extension direction of the guide structure, punching a groove on the inner wall of the outer ring of the impeller housing (900); The punch assembly (400) comprises a punch head (410) and a slider (420) of an L-shaped structure, wherein the punch head (410) is detachably mounted on the slider (420); The fixing assembly (300) includes a fixing seat (310) and a limiting ring (320), and the lower die includes a lower die seat (600), a lower pad (700), and a lower die plate (800) arranged in sequence from bottom to top; A second nitrogen spring (740) is fixedly installed in the lower pad (700), a lifting column (830) drivingly connected to the telescopic end at the top of the second nitrogen spring (740) is slidably installed in the lower template (800), a positioning opening (920) with a polygonal structure is provided through the center of the impeller shell (900), and a positioning head (840) adapted to the positioning opening (920) is installed on the top of the lifting column (830); A third nitrogen spring (340) is fixedly installed in the fixing seat (310), and the telescopic end at the bottom of the third nitrogen spring (340) is drivingly connected to a pressing core (350) that is slidably connected to the fixing seat (310). The pressing core (350) is located directly above the lifting column (830), and a receiving hole (351) for accommodating the positioning head (840) is provided at the bottom of the pressing core (350).

2. The impeller housing tower side forming mold according to claim 1, characterized in that: The groove is configured as a U-shaped groove (810), the clamping groove is a blind groove (910), and the punch assembly (400) cooperates with the U-shaped groove (810) to stamp and form the blind groove (910).

3. A pump impeller shell tower side forming mold according to claim 1 or 2, characterized in that: The punch assemblies (400) are distributed in N groups in a circular array around the center line of the fixing assembly (300).

4. The impeller housing tower side forming mold according to claim 1, characterized in that: The punching head (410) is provided with a punching and forming end (411), and the punching and forming end (411) is arranged obliquely. The slider (420) is provided with a mounting groove (4211), and the punching head (410) is mounted in the mounting groove (4211) via bolts.

5. The impeller housing tower side forming mold according to claim 4, characterized in that: The fixing assembly (300) is provided with N limiting grooves (311), the guide structure is provided as a guide groove (541), the slider (420) comprises a first slider (421) and a second slider (422), the first slider (421) is slidably connected to the limiting groove (311), the second slider (422) is slidably connected to the guide groove (541), and the mounting groove (4211) is provided on the first slider (421).

6. The impeller housing tower side forming mold according to claim 5, characterized in that: The fixing seat (310) is fixedly connected to the bottom surface of the upper pad (200), the limiting ring (320) is arranged between the fixing seat (310) and the guide assembly (500), and the limiting ring (320) is fixedly connected to the fixing seat (310) through a connecting column (330), the limiting groove (311) is arranged on the outer ring of the fixing seat (310), and the inner ring of the limiting ring (320) is slidably fitted with the first slider (421).

7. The impeller housing tower side forming mold according to claim 6, characterized in that: A first nitrogen spring (210) is fixedly installed in the upper pad (200), and the guide assembly (500) includes a first clamping plate (510), a ring plate (520) and a second clamping plate (530) arranged in sequence from top to bottom to enclose the guide groove (541). The first clamping plate (510) is connected to the telescopic end at the bottom of the first nitrogen spring (210), and the upper pad (200) is fixedly installed with a support block (220) for supporting the first clamping plate (510).

8. The impeller housing tower side forming mold according to claim 7, characterized in that: A limiting column (710) for supporting the second clamping plate (530) is fixedly mounted on the lower pad (700), and a receiving groove (820) adapted to the outer contour of the impeller housing (900) is provided on the top of the lower template (800), and the groove is provided on the groove wall of the receiving groove (820).

9. A method for using a pump impeller shell tower side forming mold, characterized in that: The method for using the impeller shell tower side forming mold according to claim 8 comprises the following steps: S1, placing the impeller housing (900); S2, the upper mold moves downward, and the pressing core (350) and the lifting column (830) press the impeller housing (900); S3, the upper die and the lower die are closed, and the punch head (410) is pushed into the impeller housing (900) along the extension direction of the guide groove (541); S4, the upper die and the lower die are separated, and the punch head (410) exits the impeller housing (900) in the opposite direction to that in S3; S5. Take out the impeller housing (900).

10. The method for using the impeller housing tower side forming mold according to claim 9, characterized in that: The S3 includes the following steps: S31, the pressing core (350) moves downward, pushing the impeller housing (900) to fit the groove wall of the accommodating groove (820); S32, the second clamping plate (530) abuts against the limiting column (710); S33: The fixing assembly (300) moves downward, and the fixing seat (310) pushes the slider (420) and the punch head (410) to move along the extension direction of the guide groove (541), and the punching end (411) of the punch head (410) pushes into the impeller housing (900).

11. The method for using the impeller housing tower side forming mold according to claim 10, characterized in that: The S4 comprises the following steps: S41, the fixing assembly (300) moves upward, the second clamping plate (530) maintains contact with the limiting column (710), the limiting ring (320) pushes the slider (420) and the punch head (410) to move in the opposite direction of S33, and the punching end (411) of the punch head (410) withdraws from the slot of the impeller housing (900); S42, separating the second clamping plate (530) from the limiting column (710); S43: The lifting column (830) pushes the impeller housing (900) upward, and the impeller housing (900) is separated from the accommodating groove (820).

Images