A special forming die for oil pump rotor

Abstract

The utility model provides a kind of special forming die of oil pump rotor, for oil pump rotor processing forming, including forming upper punch, the forming middle die being set in the just below of forming upper punch and with the outer shape of forming upper punch matching, the forming next punch being matched with the outer shape of forming middle die, the forming second punch being set in forming next punch and the forming core rod being matched with the inner shape of forming next punch, the oil pump rotor includes the inner cavity formed by forming core rod and forming upper punch cooperation processing, the outer ring formed by forming next punch and forming upper punch cooperation processing and the shaft hole formed by forming second punch and forming upper punch cooperation processing, the shaft hole is evenly distributed on outer ring.The utility model discloses a kind of special forming die of oil pump rotor structure simple, easy to operate, good forming effect, not only can make the shaft hole and the body of oil pump rotor stable synchronous forming, and greatly improve the structural strength of oil pump rotor.

Description

Technical Field

[0001] This utility model belongs to the technical field of powder metallurgy production equipment, specifically a special forming mold for oil pump rotors. Background Technology

[0002] Powder metallurgy is a process technology that produces metal powders or uses metal powders (or mixtures of metal powders and non-metal powders) as raw materials, and manufactures metal materials, composite materials and various types of products through forming and sintering.

[0003] In existing technologies, oil pump rotors are generally manufactured using powder metallurgy. This manufacturing method enables low-cost and high-efficiency production of oil pump rotors. Currently, some specialized oil pump rotors have non-standard structures. Due to the irregular shape of the rotor, different parts experience different centrifugal forces during rotation. This difference in centrifugal force causes stress concentration in certain areas of the rotor, leading to fatigue damage. Therefore, there is an urgent need to design a powder metallurgy mold that can achieve one-time molding of specialized oil pump rotors to improve the structural strength of oil pump rotor products. Utility Model Content

[0004] This utility model proposes a special forming mold for oil pump rotors. By combining the lower forming punch and the lower second forming punch with the upper forming punch, the shaft hole and rotor body of the oil pump rotor are effectively formed synchronously. This modified oil pump rotor avoids the problem of reduced structural strength of the product due to stress concentration in the outer ring of the oil pump rotor, and effectively solves the problems in the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: A special forming die for oil pump rotors is used for processing and forming oil pump rotors. It includes an upper forming punch, a middle forming die located directly below the upper forming punch and matching the shape of the upper forming punch, a lower forming punch matching the shape of the middle forming die, a second lower forming punch located inside the lower forming punch, and a forming mandrel matching the inner shape of the lower forming punch. The oil pump rotor includes an inner cavity formed by the cooperation of the forming mandrel and the upper forming punch, an outer ring formed by the cooperation of the lower forming punch and the upper forming punch, and a shaft hole formed by the cooperation of the second lower forming punch and the upper forming punch. The shaft holes are evenly distributed on the outer ring. The upper forming punch, the middle forming die, the lower forming punch, the second lower forming punch, and the forming mandrel are all coaxially arranged and clearance-fitted.

[0006] The outer ring includes an octagonal outer contour and a quadrilateral inner contour. Adjacent outer edges of the outer contour are connected by a circular arc transition. The inner contour includes a first circular arc segment and a second circular arc segment with the same structure connected to each other. The shaft hole is located between the outer edge and the second circular arc segment.

[0007] The number of shaft holes is 4 sets, and each set of shaft holes includes a first hole and a second hole. The first hole and the second hole are axially symmetric about the line connecting the outer edge and the midpoint of the second arc segment.

[0008] The oil pump rotor is rotatably connected to an inner rotor. The inner rotor includes an inner rotor body with a keyway at the center and a rotating bearing rotatably connected to the bottom of the inner rotor. The rotating bearing is always in contact with the inner cavity during rotation. There are three rotating bearings, and the connecting lines of the centers of the rotating bearings form a virtual equilateral triangle.

[0009] The upper forming punch is also fitted with an upper punch cover on its outer side. The lower forming punch has a lower punch pad at its bottom and a lower punch cover at its top. The lower forming punches are arranged from top to bottom as follows: a lower punch upper cover, a lower punch cover, a lower punch pad, and a lower punch lower cover. An air hole is provided on the side of the upper forming punch that is in contact with the upper punch cover.

[0010] The upper part of the forming mandrel is provided with a mandrel cap, the lower part of the mandrel is provided with a mandrel connecting rod, and the lower part of the mandrel connecting rod is provided with a mandrel pressure pad. The number of forming lower punches is 8.

[0011] This utility model has the following features and beneficial effects: This utility model relates to a special molding die for an oil pump rotor, which has the following characteristics: 1. By setting a forming lower punch and a forming lower second punch in the lower mold to cooperate with the forming upper punch, the synchronous forming of the shaft hole and the rotor body of the oil pump rotor is effectively realized. The evenly distributed shaft hole helps to maintain the balance of the oil pump rotor, reduce the unbalanced force generated during high-speed rotation, and avoid the problem of poor structural strength of the product due to stress concentration in the outer ring of the oil pump rotor. 2. By ensuring the proper fit of the components within the mold, the forming accuracy of the oil pump rotor is guaranteed while ensuring the normal operation of the mold. By opening air holes on the upper punch side of the forming process, the product is effectively protected from damage caused by air pressure squeezing during the forming process. 3. By installing an upper punch cover on the outside of the upper punch, the stability of the upper punch during its movement can be ensured. A lower punch pressure pad is set at the bottom of the lower punch and a lower punch pressure cover is set on the top. The upper cover, pressure cover, pressure pad, and lower cover of the lower second punch are set on both sides of the lower second punch, which not only ensures the stability of the stamping process but also ensures the sealing during powder filling to prevent powder leakage. By setting pressure covers and pressure pads on both sides of the mandrel, the impact force can be effectively buffered, ensuring the service life of the mandrel.

[0012] The technical advantages of this invention compared to the prior art are: the special molding die for oil pump rotor of this utility model has a simple structure, is easy to operate, and has a good molding effect. It can not only make the shaft hole and body of the oil pump rotor stable and synchronously formed, but also greatly improve the structural strength of the oil pump rotor. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a cross-sectional view of the connection structure of the upper forming punch, lower forming punch, lower second forming punch and forming mandrel in a special forming mold for oil pump rotor according to this utility model. Figure 2 This is a schematic diagram of the connection structure of the next punch, the next punch pad, and the next punch cover in a special forming mold for an oil pump rotor according to this utility model; Figure 3 This is a schematic diagram of the connection structure of the lower two punches, the upper cover of the lower two punches, the pressure cover of the lower two punches, the pressure pad of the lower two punches, and the lower cover of the lower two punches in a special forming mold for an oil pump rotor according to this utility model. Figure 4 This is a schematic diagram of the connection structure of the forming mandrel, mandrel cover, mandrel connecting rod and mandrel pad in a special forming mold for oil pump rotor according to this utility model. Figure 5 This is a schematic diagram of the connection structure between the oil pump rotor and the inner rotor in a special molding die for an oil pump rotor according to this utility model. Figure 6 This is a top view of the oil pump rotor in a special molding die for an oil pump rotor according to this utility model.

[0015] In the diagram, 1-forming upper punch; 2-forming middle die; 3-forming lower punch; 4-forming lower second punch; 5-forming mandrel; 6-oil pump rotor; 61-inner cavity; 62-outer ring; 63-shaft hole; 631-first hole; 632-second hole; 64-outer contour; 641-outer edge; 65-inner contour; 651-first arc segment; 652-second arc segment; 7-inner rotor; 8-rotating bearing; 9-upper punch cover; 10-lower punch pad; 11-lower punch cover; 12-lower second punch upper cover; 13-lower second punch cover; 14-lower second punch pad; 15-lower second punch lower cover; 16-air hole; 17-mandrel connector; 18-mandrel cover; 19-mandrel pad. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0017] Reference Figure 1 and Figure 5 The diagram shows a cross-sectional view of the connection structure of a forming upper punch, a forming lower punch, a forming lower second punch, and a forming mandrel in a special forming mold for an oil pump rotor. It also shows a schematic diagram of the connection structure between the oil pump rotor and the inner rotor. The special forming mold for an oil pump rotor 6 is used for processing and forming the oil pump rotor 6. It includes a forming upper punch 1, a forming middle die 2 located directly below the forming upper punch 1 and matching its shape, a forming lower punch 3 matching its shape, a forming lower second punch 4 located within the forming lower punch 3, and a forming mandrel 5 matching its inner shape. The oil pump rotor 6 includes an inner cavity 61 formed by the forming mandrel 5 and the forming upper punch 1, an outer ring 62 formed by the forming lower punch 3 and the forming upper punch 1, and shaft holes 63 formed by the forming lower second punch 4 and the forming upper punch 1. The shaft holes 63 are evenly distributed on the outer ring 62. The number of shaft holes 63 is 4 sets. Each set of shaft holes 63 includes a first hole 631 and a second hole 632. The first hole 631 and the second hole 632 are axially symmetrical about the line connecting the midpoint of the outer edge 641 and the second arc segment 652. By setting a forming lower punch 3 and a forming lower second punch 4 in the lower mold and cooperating with the forming upper punch 1, the synchronous forming of the shaft holes 63 of the oil pump rotor 6 and the rotor body is effectively realized. The evenly distributed shaft holes 63 help to maintain the balance of the oil pump rotor 6, reduce the unbalanced force generated during high-speed rotation, and avoid the problem of poor structural strength of the product due to stress concentration in the outer ring 62 of the oil pump rotor 6. The forming upper punch 1, forming middle mold 2, forming lower punch 3, forming lower second punch 4 and forming mandrel 5 are all coaxially set and have clearance fit. The clearance fit of each component in the mold ensures the forming accuracy of the oil pump rotor 6 while ensuring the normal operation of the mold.

[0018] The outer ring 62 includes an octagonal outer contour 64 and a quadrilateral inner contour 65. The two adjacent outer edges 641 of the outer contour 64 are connected by a circular arc transition. The inner contour 65 includes a first circular arc segment 651 and a second circular arc segment 652 with the same structure connected to each other. The shaft hole 63 is disposed between the outer edge 641 and the second circular arc segment 652.

[0019] The oil pump rotor 6 is internally connected to an inner rotor 7. The inner rotor 7 includes an inner rotor body with a keyway at the center and a rotating bearing 8 rotatably connected to the bottom of the inner rotor 7. The rotating bearing 8 is always in contact with the inner cavity 61 during rotation. There are three rotating bearings 8, and the connecting lines of the centers of the rotating bearings 8 form a virtual equilateral triangle.

[0020] Reference Figure 2 , Figure 3 and Figure 4 As shown, in a special forming mold for an oil pump rotor, an upper punch 1 is fitted with an upper punch cover 9 on its outer side. A lower punch 3 is provided with a lower punch pad 10 at its bottom and a lower punch cover 11 at its top. The lower punch 4 is provided with a lower punch upper cover 12, a lower punch cover 13, a lower punch pad 14, and a lower punch lower cover 15 from top to bottom. An air hole 16 is provided on the side of the upper punch 1 that is in contact with the upper punch cover 9. By providing an air hole 16 on one side of the upper punch 1, the product damage caused by air pressure squeezing during the forming process is effectively avoided. A mandrel cover 18 is provided on the upper part of the forming mandrel 5, a mandrel connecting rod 17 is provided on the lower part of the mandrel, and a mandrel pad 19 is provided on the lower part of the mandrel connecting rod 17. The number of lower punches 4 is 8.

[0021] By sleeved with an upper punch cover 9 on the outside of the upper punch 1, the stability of the upper punch 1 during its movement can be ensured. A lower punch pad 10 is set at the bottom of the lower punch 3 and a lower punch cover 11 is set on the top. The lower second punch upper cover 12, lower second punch cover 13, lower second punch pad 14 and lower second punch lower cover 15 are set on both sides of the lower second punch 4, which not only ensures the stability of the stamping process but also ensures the sealing during powder filling to prevent powder leakage. By setting the cover and pad on both sides of the mandrel, the impact force can be effectively buffered, ensuring the service life of the mandrel.

[0022] The special molding die for oil pump rotor 6 of this utility model has a simple structure, is easy to operate, and has a good molding effect. It can not only make the shaft hole 63 and the body of oil pump rotor 6 stably and synchronously, but also greatly improve the structural strength of oil pump rotor 6.

[0023] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A special forming die for an oil pump rotor for machining and forming of an oil pump rotor, characterized in that: The pump rotor includes a forming upper punch, a forming middle die located directly below the forming upper punch and matching its shape, a forming lower punch matching its shape, a forming lower second punch located within the forming lower punch, and a forming mandrel matching its shape. The oil pump rotor includes an inner cavity formed by the forming mandrel and the forming upper punch, an outer ring formed by the forming lower punch and the forming upper punch, and a shaft hole formed by the forming lower second punch and the forming upper punch. The shaft holes are evenly distributed on the outer ring. The forming upper punch, the forming middle die, the forming lower punch, the forming lower second punch, and the forming mandrel are all coaxially arranged and clearance-fitted.

2. A special forming die for an oil pump rotor as set forth in claim 1, characterized in that: The outer ring includes an octagonal outer contour and a quadrilateral inner contour. Adjacent outer edges of the outer contour are connected by a circular arc transition. The inner contour includes a first circular arc segment and a second circular arc segment with the same structure connected to each other. The shaft hole is located between the outer edge and the second circular arc segment.

3. A special forming die for an oil pump rotor as defined in claim 2, characterized in that: The number of shaft holes is 4 sets, and each set of shaft holes includes a first hole and a second hole. The first hole and the second hole are axially symmetric about the line connecting the outer edge and the midpoint of the second arc segment.

4. A special forming mold for an oil pump rotor according to claim 1, 2, or 3, characterized in that: The oil pump rotor is rotatably connected to an inner rotor. The inner rotor includes an inner rotor body with a keyway at the center and a rotating bearing rotatably connected to the bottom of the inner rotor. The rotating bearing is always in contact with the inner cavity during rotation. There are three rotating bearings, and the connecting lines of the centers of the rotating bearings form a virtual equilateral triangle.

5. A special forming mold for an oil pump rotor according to claim 1, 2, or 3, characterized in that: The upper forming punch is also fitted with an upper punch cover on its outer side. The lower forming punch has a lower punch pad at its bottom and a lower punch cover at its top. The lower forming punches are arranged from top to bottom as follows: a lower punch upper cover, a lower punch cover, a lower punch pad, and a lower punch lower cover. An air hole is provided on the side of the upper forming punch that is in contact with the upper punch cover.

6. A special forming mold for an oil pump rotor according to claim 1, 2, or 3, characterized in that: The upper part of the forming mandrel is provided with a mandrel cap, the lower part of the mandrel is provided with a mandrel connecting rod, and the lower part of the mandrel connecting rod is provided with a mandrel pressure pad. The number of forming lower punches is 8.

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