A vertical expansion die for water pump end ring

Abstract

This invention belongs to the field of molds, specifically relating to a vertical expansion mold for water pump end rings. The vertical expansion mold includes: a punch, a die, a punch fixing device, a die fixing device, and a workpiece limiting mechanism. The punch includes a working part and a connecting part; the punch fixing device includes an upper mold base, a punch connecting ring, a stripping assembly, and a guiding assembly; the die fixing device includes a lower mold base and a connecting assembly connecting the lower mold base and the die. This invention, through mold design, achieves targeted expansion of small-sized end rings while also considering potential issues during expansion, such as workpiece displacement and the difficulty of removing the workpiece after expansion. This demonstrates the practicality of the invention's specific structure. Furthermore, the use of this invention saves on the manufacturing needs of multi-sized molds and reduces the saturation casting process for end rings of various sizes, contributing to environmental protection and the rational and effective use of resources.

Description

Technical Field

[0001] This invention belongs to the field of molds, specifically relating to a vertical expansion mold for a water pump end ring. Background Technology

[0002] The function of a pump end ring is to create a narrow, tortuous channel between the impeller and the pump casing, thereby increasing the flow resistance of the liquid and reducing liquid leakage. The pump end ring also serves to protect the pump's key components from wear. After the end ring is worn out, the correct assembly clearance can be restored by repairing or replacing it with a new ring, thus continuing to protect the pump's key components. Therefore, the pump end ring is an important consumable used in various types of pumps.

[0003] Existing pump end rings are typically manufactured using casting. Since pumps come in various sizes, their end rings also vary accordingly. The casting process requires the creation of various molds of different sizes, which consumes significant resources. Furthermore, due to uncertainties in customer demand and delivery time for different sizes of end rings, factories often perform saturation casting of all sizes. However, the consumption rate of end rings varies, and some sizes may remain unused for extended periods, resulting in waste due to incompatibility with other pump sizes. This ultimately leads to resource waste. Moreover, the casting process itself causes severe environmental pollution.

[0004] Therefore, how to reduce the manufacturing of end ring molds and the casting of uncommon end ring sizes by making reasonable use of end rings of various sizes, thereby saving resources and protecting the environment, is an urgent problem to be solved in the field of mold technology. Summary of the Invention

[0005] Therefore, the purpose of this invention is to provide a vertical expansion mold for water pump end rings, which aims to overcome the problem in the prior art that end rings of different sizes cannot be used interchangeably, thus causing resource waste.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows:

[0007] A vertical expansion mold for a water pump end ring, comprising:

[0008] A punch has a stepped working part at its lower part, the working part including a small diameter part and a large diameter part, the small diameter part and the large diameter part being connected by a slope, and a connecting part at the upper part of the punch;

[0009] A die is fitted onto the outside of the large diameter portion of the punch. The die expands and pushes the workpiece, which was previously placed in the small diameter portion, to the large diameter portion by cooperating with the large diameter portion, thereby completing the expansion action of the workpiece.

[0010] A punch fixing device includes a punch connecting ring, wherein the punch connecting ring and the connecting part of the punch are detachably connected by a first cylindrical pin;

[0011] A die fixing device includes a lower die base, the lower die base and the die are connected by a connecting assembly, the die fixing device is used to limit the die and restrict the movement of the die in any direction;

[0012] Several sets of workpiece limiting mechanisms are disposed on the die cavity, and the several sets of workpiece limiting mechanisms are used to limit the workpiece throughout the working process of the vertical expansion die.

[0013] Preferably, the punch fixing device further includes an upper die base, a pad is provided below the upper die base, a punch retaining ring is provided below the pad, and the punch retaining ring is also sleeved on the outside of the punch connecting ring. The upper die base, the pad, and the punch retaining ring are positioned and connected by a plurality of second cylindrical pins. On this basis, the punch retaining ring achieves synchronous movement of the punch and the punch fixing device by cooperating with the punch connecting ring.

[0014] In addition, the lower part of the punch fixing device is connected to an unloading assembly via an unloading screw. The unloading assembly is used to facilitate the removal of the workpiece from the punch after the workpiece expansion action is completed.

[0015] Furthermore, the ejector screw is an incomplete screw, that is, the screw shaft is a smooth screw shaft, one end of the screw shaft is provided with partial threads and the other end is provided with a nut, and the smooth screw shaft part of the ejector screw smoothly passes through the upper mold base, the pad plate and the punch retaining ring from top to bottom; on this basis, there are several ejector screws, and they are evenly distributed along the circumference of the punch retaining ring;

[0016] The unloading assembly also includes an unloading washer, which is partially threaded to the unloading screw through a threaded hole. A first spring is also fitted on the unloading screw, which is located between the punch retaining ring and the unloading washer.

[0017] Preferably, the punch fixing device further includes two sets of guide components, which are symmetrically arranged on the upper die base. Each set of guide components includes a guide post connecting the upper die base and the lower die base, and guide holes and receiving holes respectively provided on the upper die base and the lower die base. When the vertical expansion die is working, the punch fixing device together with the punch achieves accurate pressing action under the limiting and guiding action of the guide components.

[0018] Preferably, in the die fixing device, the connecting assembly includes a plurality of first screws and third cylindrical pins that connect the lower die base and the die, wherein the plurality of first screws and the plurality of third cylindrical pins are evenly arranged on the die.

[0019] Preferably, on the die cavity, a plurality of workpiece limiting mechanisms are evenly arranged on the outer circular end face of the die cavity, wherein each set of workpiece limiting mechanisms includes a positioning card, the lower part of the positioning card is connected to the die cavity by two second screws, and at this time, the upper part of the positioning card is higher than the upper end face of the die cavity in a horizontal position.

[0020] In addition, the workpiece limiting mechanism also includes a limiting screw, which is also an incomplete screw. The limiting screw is located on the upper part of the positioning card and is installed along the radial direction of the punch. The smooth screw part of the limiting screw passes smoothly through the positioning card. A positioning block is connected to part of the threaded part of the limiting screw. On this basis, a second spring is also sleeved on the limiting screw. The second spring is located between the positioning block and the positioning card.

[0021] Preferably, the punch is made of quenched T8 steel, and the die is made of 45# steel.

[0022] The beneficial effects of this invention are as follows:

[0023] This invention achieves the transformation of a small-sized end ring into a large-sized end ring through the mutual extrusion of a punch and a die. The required end ring size is determined by the working part of the punch, that is, the size of the final formed end ring is adjusted by making and adjusting the size of the working part of the punch, which demonstrates the practicality of this invention.

[0024] The present invention provides fixing devices for both the punch and the die to limit and fix them. In addition, the present invention also provides a workpiece limiting mechanism on the die to limit the workpiece during the entire process of clamping and extrusion expansion forming, so as to prevent the workpiece from shifting due to the extrusion force, which would cause the extrusion to fail.

[0025] The present invention provides a convenient release action for the workpiece that is sleeved on the large diameter part of the working part of the punch after extrusion by means of the unloading component set on the punch fixing device, which demonstrates the practicality of the present invention;

[0026] In summary, this invention, through the specific design of the mold structure, achieves the purposeful expansion of small-sized end rings, while also taking into account various situations that may occur during the expansion process, such as workpiece displacement and the difficulty in removing the workpiece after expansion. This demonstrates the practicality of the specific structure of this invention. In addition, the use of this invention allows some unusable or excessively stockpiled small-sized end rings to be modified and reused, saves the manufacturing needs of multi-sized molds, and even reduces the saturation casting process for end rings of various sizes, contributing to environmental protection and providing a foundation for the rational and effective use of resources, thus demonstrating the practicality of this invention. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a frontal sectional view of the present invention;

[0029] Figure 2 This is a top view of the die fixing device and the die of the present invention.

[0030] Figure 3 This is a schematic diagram of the inner diameter X and structure of the original water pump end ring workpiece in this invention;

[0031] Figure 4 This is a schematic diagram of the dimensions and structure of the pump end ring workpiece after expansion under ideal conditions in this invention. Detailed Implementation

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0034] The existing technology for casting and using pump end rings has the following drawbacks: Since pump end rings are consumable parts of varying sizes required by pumps, most factories use saturation casting to meet sudden customer demands for end rings of different sizes. However, the consumption rate of end rings varies, and some sizes are not needed for extended periods. Furthermore, cast end rings of different sizes cannot be interchanged, ultimately leading to resource waste. Additionally, the casting process itself causes severe environmental pollution. The inability to interchange cast end rings of different sizes further exacerbates resource waste.

[0035] In view of this, the present invention, through the specific design of the mold structure, achieves the purposeful expansion of small-sized end rings, while also taking into account various situations that may occur during the expansion process, such as workpiece displacement and the inconvenience of disassembling the workpiece after expansion. This demonstrates the practicality of the specific structure of the present invention. In addition, the use of the present invention allows some unusable or excessively stockpiled small-sized end rings to be modified and reused, saves the manufacturing needs of multi-sized molds, and even reduces the saturation casting process for end rings of various sizes. This contributes to environmental protection, provides a foundation for the rational and effective use of resources, and makes a beneficial technical improvement to change the status quo of the industry.

[0036] The solution provided by the present invention will now be described in detail with reference to the accompanying drawings.

[0037] In this technical solution, such as Figure 1As shown, the punch 1 has a stepped working part at its lower part, the working part includes a small diameter part 101 and a large diameter part 102, the small diameter part 101 and the large diameter part 102 are connected by a slope, and the upper part of the punch 1 is provided with a connecting part 103.

[0038] The concave mold 2 is sleeved on the outside of the large diameter portion 102 of the convex mold 1.

[0039] In this embodiment, the die 2, through its cooperation with the large-diameter portion 102, expands and pushes the workpiece, which was previously placed in the small-diameter portion 101, to the large-diameter portion 102 by pressing the punch 1, thus completing the expansion action of the workpiece. Among them, the punch 1, as the working part that mainly provides expansion power, plays a crucial role in the expansion process of the water pump end ring. It is made of quenched T8 steel, which gives it high hardness and wear resistance. The die 2, as the limiting part that plays a limiting and supporting role, also plays an important role in the expansion process of the water pump end ring. It is made of 45 steel, which can effectively enable it to play a limiting role.

[0040] In this invention, the punch 1, as the main core of the mold, can change the maximum size of its expanding end ring according to the change of the size of its small diameter portion 101 and large diameter portion 102. Although each size requires a punch 1 and a die 2 to be adapted, compared with casting molds of different sizes and the continuous casting process, the advantage of this invention is that the equipment that needs to be adjusted is smaller, and a large number of casting processes are saved, making a great contribution to resource utilization and environmental protection.

[0041] In this technical solution, such as Figure 1 As shown, the punch fixing device 3 includes a punch connecting ring 301, which is detachably connected to the connecting part 103 of the punch 1 through a first cylindrical pin 302.

[0042] In this embodiment, regardless of the size of the working part at the bottom of the punch 1, the connecting part at the top remains unchanged. The punch 1 is mounted on the punch connecting ring 301 and moves with the punch connecting ring 301 through the first cylindrical pin 302 cooperating with the punch connecting ring 301 and the preset through hole on the connecting part. This arrangement allows the punch 1 to be installed on the punch connecting ring 301 and move with the punch connecting ring 301 when other sizes of end rings are desired. This demonstrates the practicality of the present invention.

[0043] In addition, the punch fixing device 3 also includes an upper die base 303, a pad 304 is provided below the upper die base 303, a punch retaining ring 305 is provided below the pad 304, and the punch retaining ring 305 is also sleeved on the outside of the punch connecting ring 301. The upper die base 303, the pad 304 and the punch retaining ring 305 are positioned and connected by a plurality of second cylindrical pins 306.

[0044] It should be noted here that the punch retaining ring 305, through its cooperation with the punch connecting ring 301, enables the synchronous movement of the punch 1 and the punch fixing device 3. In this example, as shown... Figure 1 As shown, the synchronous movement of the punch 1 and the punch fixing device 3 is achieved by the engagement of the boss and the cavity. The synchronous movement of the punch 1 and the punch fixing device 3 can also be achieved by other engagement methods, such as threaded connection or key connection.

[0045] Furthermore, the lower part of the punch fixing device 3 is connected to a stripping assembly via a stripping screw 307. The stripping screw 307 is an incomplete screw, that is, the screw rod of the stripping screw 307 is a smooth screw rod. One end of the screw rod is provided with partial threads, and the other end is provided with a nut. The smooth screw rod part of the stripping screw 307 smoothly passes through the upper die base 303, the pad 304, and the punch retaining ring 305 from top to bottom. On this basis, there are several stripping screws 307, which are evenly distributed along the circumference of the punch retaining ring 305.

[0046] The unloading assembly also includes an unloading washer 308, which is partially threaded to the unloading screw 307 through a threaded hole. A first spring 309 is also sleeved on the unloading screw 307, and the first spring 309 is located between the punch retaining ring 305 and the unloading washer 308.

[0047] In this embodiment, the unloading assembly is used to facilitate the removal of the workpiece from the punch 1 after the workpiece expansion action is completed. When the unloading screw 307 is installed on the punch fixing device 3 in a normal state, the lower end face of the nut abuts against the upper end face of the pre-set connecting hole in the upper die base 303. At this time, several nuts of several unloading screws 307 and unloading washers 308 jointly bear the weight of the pad 304, punch retaining ring 305, punch connecting ring 301 and the punch 1 itself. At this time, the first spring 309 is in a compressed state.

[0048] In addition, to ensure that the first spring 309 is in a slightly compressed state so that the above-mentioned parts do not fall off the positioning and shift, the weight of the punch 1 should be as light as possible while selecting a larger stiffness coefficient for the first spring 309. Therefore, the connecting part 103 of the punch 1 only needs to ensure that there is enough space to allow it to be detachably connected to the punch connecting ring 301 through the first cylindrical pin 302. This structural design makes the overall weight of the vertical expansion mold provided by the present invention lighter, thus facilitating operation by workers and allowing the selection of a press with a smaller nominal pressure to provide power to the vertical expansion mold, saving production costs and demonstrating the practicality of the present invention. The expansion mold needs to be used with a press, which is a conventional technical means of existing mold forming processes. Therefore, the other key points of this process will not be described in detail here.

[0049] In this technical solution, such as Figure 1-2 As shown, the die fixing device 4 includes a lower die base 401, which is connected to the die 2 via a connecting assembly.

[0050] The connecting assembly includes a plurality of first screws 402 and third cylindrical pins 403 that connect the lower mold base 401 and the cavity mold 2. The plurality of first screws 402 and the plurality of third cylindrical pins 403 are evenly arranged on the cavity mold 2.

[0051] In this embodiment, after the die 2 is connected to the die fixing device 4 by the connecting component, the die fixing device 4 limits the die 2, restricting the movement of the die 2 in any direction, and providing an accurate positional basis for the expansion work of the punch 1.

[0052] In addition, the technical solution provided by the present invention also includes several sets of workpiece limiting mechanisms 5. Several sets of workpiece limiting mechanisms 5 are disposed on the cavity mold 2 and are evenly arranged on the outer circular end face of the cavity mold 2. Each set of workpiece limiting mechanisms 5 includes a positioning card 501. The lower part of the positioning card 501 is connected to the cavity mold 2 by two second screws 502. At this time, the upper part of the positioning card 501 is higher than the upper end face of the cavity mold 2 in a horizontal position.

[0053] In addition, the workpiece limiting mechanism 5 also includes a limiting screw 503, which is also an incomplete screw. The limiting screw 503 is located on the upper part of the positioning card 501 and is installed along the radial direction of the punch 1. The smooth screw part of the limiting screw 503 smoothly passes through the positioning card 501. A positioning block 504 is connected to a part of the threaded part of the limiting screw 503. On this basis, a second spring 505 is also sleeved on the limiting screw 503. The second spring 505 is located between the positioning block 504 and the positioning card 501.

[0054] In this embodiment, several sets of workpiece limiting mechanisms 5 are used to limit the workpiece throughout the entire working process of the vertical expansion mold. That is, when the original workpiece is sleeved on the outer wall of the small diameter portion 101 of the punch 1, the positioning block 504 is attached to the circumferential side wall of the workpiece, and at this time the second spring 505 is in a slightly compressed state. The workpiece is limited by the combined action of the punch 1 on its inner wall and the positioning block 504 on its outer wall, which prevents the original workpiece from shifting position during the entire expansion process, thereby causing a waste of resources.

[0055] In this technical solution, the expansion action of the punch 1 requires a guide assembly to guide it in its vertical direction of movement. The guide assembly includes two sets, which are symmetrically arranged on the upper die base 303. Each set of the guide assembly includes a guide post 404 connecting the upper die base 303 and the lower die base 401, and a guide hole and a receiving hole respectively provided in the upper die base 303 and the lower die base 401. The guide post 404 plays a guiding role in the guide hole and the receiving hole.

[0056] In this embodiment, when the vertical expansion mold is in operation, the punch fixing device 3, together with the punch 1, achieves accurate pressing action under the limiting and guiding action of the guide assembly.

[0057] Specifically, when using the vertical expansion mold provided by this invention to expand a small-sized water pump end ring, such as... Figure 3 As shown, when forming a large-size pump end ring to improve its utilization rate, such as... Figure 4 As shown, the expansion increment of the small-sized water pump end ring is 4mm. First, the punch 1 is fixed on the punch fixing device 3. Then, the original small-sized end ring is sleeved on the small diameter part 101 of the punch 1. According to the guide component, the punch fixing device 3 and the punch 1 are moved to be placed above the die 2. At this time, the lower end face of the punch 1 is flush with the upper end face of the die 2, and the lower end face of the end ring workpiece is in contact with the upper end face of the die 2.

[0058] At the same time, the positioning block 504 is attached to the circumferential side wall of the end ring workpiece, the lower end face of the unloading washer 308 is attached to the upper end face of the end ring workpiece, the first spring 309 is in a relaxed state, the second spring 505 is in a compressed state, and it still has a further compression basis; and at this time the guide post 404 can be removed.

[0059] Next, a press is used to apply pressure to the expansion mold on the upper end face of the upper mold base 303. This pressure is transmitted to the punch 1 through the punch fixing device 3. The punch 1 moves vertically downward. Since the die 2 prevents the end ring workpiece from moving downward with the punch 1, it can only move to the large diameter part 102 based on the position provided by the ramp in the working part of the punch 1. At this time, the diameter of the end ring workpiece increases by 4mm. The second spring 505 is further compressed, and the first spring 309 is also further compressed. The additional compression distance is the height of the end ring workpiece.

[0060] Then, control the press to lift vertically upwards. The punch fixing device 3, punch 1, and the expanded end ring workpiece are all lifted with the press. At this time, the operator can remove the end ring workpiece from the large diameter part 102 of punch 1 by tapping the nut part of the unloading screw 307 in conjunction with the elasticity of the first spring 309. This completes the expansion process of one end ring workpiece.

[0061] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vertical expansion mold for a water pump end ring, characterized in that, include: A punch has a stepped working part at its lower part, the working part including a small diameter part and a large diameter part, the small diameter part and the large diameter part being connected by a slope, and a connecting part at the upper part of the punch; A die is fitted onto the outside of the large diameter portion of the punch. The die expands and pushes the workpiece, which was previously placed in the small diameter portion, to the large diameter portion by cooperating with the large diameter portion, thereby completing the expansion action of the workpiece. A punch fixing device includes a punch connecting ring, wherein the punch connecting ring and the connecting part of the punch are detachably connected by a first cylindrical pin; A die fixing device includes a lower die base, the lower die base and the die are connected by a connecting assembly, the die fixing device is used to limit the die and restrict the movement of the die in any direction; Several sets of workpiece limiting mechanisms are disposed on the die cavity, and the several sets of workpiece limiting mechanisms are used to limit the workpiece throughout the working process of the vertical expansion die. The punch fixing device further includes an upper die base, a pad is provided below the upper die base, and a punch retaining ring is provided below the pad. The punch retaining ring is also sleeved on the outside of the punch connecting ring. The upper die base, the pad, and the punch retaining ring are positioned and connected by a number of second cylindrical pins. Based on this, the punch retaining ring achieves synchronous movement of the punch and the punch fixing device by cooperating with the punch connecting ring. In addition, the lower part of the punch fixing device is connected to an unloading assembly via an unloading screw. The unloading assembly is used to facilitate the removal of the workpiece from the punch after the expansion action of the workpiece is completed. The unloading screw is an incomplete screw, that is, the screw shaft of the unloading screw is a smooth screw shaft, one end of the screw shaft is provided with partial threads and the other end is provided with a nut, and the smooth screw shaft part of the unloading screw smoothly passes through the upper mold base, the pad plate and the punch retaining ring from top to bottom; on this basis, there are several unloading screws, and they are evenly distributed along the circumference of the punch retaining ring. The unloading assembly also includes an unloading washer, which is partially threaded to the unloading screw through a threaded hole. A first spring is also sleeved on the unloading screw, which is located between the punch retaining ring and the unloading washer. The punch fixing device also includes two sets of guide components. The two sets of guide components are symmetrically arranged on the upper die base. Each set of guide components includes a guide post connecting the upper die base and the lower die base, and guide holes and receiving holes respectively provided on the upper die base and the lower die base. When the vertical expansion die is working, the punch fixing device together with the punch achieves accurate pressing action under the limiting and guiding action of the guide components. In the die fixing device, the connecting assembly includes a plurality of first screws and third cylindrical pins that connect the lower die base and the die, and the plurality of first screws and the plurality of third cylindrical pins are evenly arranged on the die. On the die cavity, several sets of workpiece limiting mechanisms are evenly arranged on the outer circular end face of the die cavity. Each set of workpiece limiting mechanisms includes a positioning card. The lower part of the positioning card is connected to the die cavity by two second screws. At this time, the upper part of the positioning card is higher than the upper end face of the die cavity in a horizontal position. In addition, the workpiece limiting mechanism also includes a limiting screw, which is also an incomplete screw. The limiting screw is located on the upper part of the positioning card and is installed along the radial direction of the punch. The smooth screw part of the limiting screw smoothly passes through the positioning card. A positioning block is connected to part of the threaded part of the limiting screw. On this basis, a second spring is also sleeved on the limiting screw. The second spring is located between the positioning block and the positioning card. The punch is made of quenched T8 steel, and the die is made of 45# steel.

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