Die structure for removing inner hole machining burrs of oil pump rotor

Abstract

The utility model discloses an oil pump rotor mould structure free of inner hole processing burrs, which comprises a forming body and a connecting rod inserted in the forming body, an anti-rotation pin for limiting rotation of the forming body and the connecting rod is inserted on the connecting rod, the peripheral surface of the forming body is provided with a cambered surface, and the cambered surface is provided with an anti-rotation pin for limiting rotation of the forming body and the connecting rod. The arc surface is formed by combining a rectangular forming surface, a first forming surface and a second forming surface which are tangent in sequence. The forming die is simple in structure, the first forming surface is arranged between the rectangular forming surface and the second forming surface by adjusting the structure of the forming die, so that the corner angle between the rectangular forming surface and the second forming surface is enlarged, burrs in the machining process can be avoided, extra cost is not needed, the labor intensity of manual burr removal is reduced, and the production efficiency is improved. And the processing efficiency of the existing product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of inner hole forming dies for oil pump rotors, in particular to a die structure for eliminating inner hole machining burrs for oil pump rotors. Background Art

[0002] The oil pump is a common mechanical equipment, mainly used to replenish and supply oil to various lubrication auxiliary devices of mechanical equipment. It is an important guarantee for the normal operation of mechanical hydraulic equipment. The rotor pair composed of inner and outer rotors is the core part of the oil pump. The drive shaft rotates the inner rotor and realizes relative motion with the outer rotor. The relative motion between the inner and outer rotors can complete the oil pump to suck and inject oil into the mechanical equipment. The inner rotor needs to cooperate with the drive shaft, and the inner diameter has high precision requirements. The normal powder metallurgy process cannot meet its assembly precision requirements. The inner diameter of the inner rotor needs to be machined to ensure its precision requirements.

[0003] The burrs produced on the keyway of the inner rotor during the processing will not only affect the assembly of the product, but also the burr particles detached during the cooperation between the inner rotor and the drive shaft after assembly will contaminate the hydraulic oil and cause damage to the oil pump. Utility Model Content

[0004] The utility model aims to provide a die structure for eliminating burrs in inner hole machining of an oil pump rotor, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a mold structure for eliminating burrs in the inner hole processing of an oil pump rotor, comprising a molded body and a connecting rod inserted into the molded body, an anti-rotation pin for limiting the rotation of the molded body and the connecting rod is inserted into the connecting rod, the outer peripheral surface of the molded body is provided with an arc surface, and the arc surface is composed of a combination of a rectangular molding surface, a first molding surface, and a second molding surface that are tangent to each other in sequence.

[0006] As a further solution of the utility model: the first molding surface is transitionally connected to the rectangular molding surface with rounded corners, and the angle between the first molding surface and the second molding surface is 10°-25°.

[0007] As a further solution of the utility model: a cavity is provided on the end surface where the molded body is connected to the connecting rod, and a threaded rod is installed inside the cavity.

[0008] As a further solution of the utility model: a flat square groove is provided on the outer peripheral surface of the connecting rod, and internal thread grooves are provided on both end surfaces of the connecting rod.

[0009] As a further solution of the utility model: the outer diameter of the connecting rod is matched with the inner diameter of the cavity, and the outer thread on the threaded rod is matched with the inner thread of the inner thread groove.

[0010] As a further solution of the utility model: pin holes are processed on the threaded rod and the connecting rod, and the pin holes are adapted to the anti-rotation pins.

[0011] As a further solution of the utility model: the diameter of the anti-rotation pin is φ2cm-φ4cm.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. By adjusting the structure of the molding die, a first molding surface is set between the rectangular molding surface and the second molding surface, so that the angle between the rectangular molding surface and the second molding surface becomes larger, which can solve the burrs in the machining process without spending extra costs, reducing the labor intensity of manual burr removal and improving the processing efficiency of existing products. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of the mold of the utility model;

[0015] Figure 2 It is a schematic diagram of a molded body of the utility model;

[0016] Figure 3 It is a side schematic diagram of the molded body of the utility model;

[0017] Figure 4 It is an enlarged schematic diagram of point A of the utility model;

[0018] Figure 5 This is a schematic diagram of the burrs on parts after processing at different edges and angles of the utility model;

[0019] Figure 6 It is a schematic diagram of the assembly diagram of the inner rotor forming mold of the utility model;

[0020] In the figure: 1, molded body; 11, rectangular molding surface; 12, first molding surface; 13, second molding surface; 14, internal thread; 2, connecting rod; 21, flat square groove; 22, internal thread groove; 3, anti-rotation pin. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-6In an embodiment of the utility model, a mold structure for eliminating burrs on the inner hole of an oil pump rotor comprises a molded body 1 and a connecting rod 2 inserted into the molded body 1, a cavity 14 is provided on the end surface where the molded body 1 is connected to the connecting rod 2, and a threaded rod 15 is installed inside the cavity 14, the outer diameter of the connecting rod 2 is adapted to the inner diameter of the cavity 14, and the outer thread on the threaded rod 15 is adapted to the inner thread of the inner thread groove 22, so as to realize the circumferential limit between the molded body 1 and the connecting rod 2, and an anti-rotation pin 3 for limiting the rotation of the molded body 1 and the connecting rod 2 is inserted on the connecting rod 2, and an arc surface is provided on the outer peripheral surface of the molded body 1, which is composed of a rectangular molding surface 11, a first molding surface 12, and a second molding surface 13 which are tangent to each other in sequence, the first molding surface 12 is connected to the rectangular molding surface 11 with a rounded transition, the angle between the first molding surface 12 and the second molding surface 13 is 10°-25°, and they are connected by a transition fillet, and the transition fillet is R0.15-R0.6.

[0023] Specifically, the molded body 1 and the connecting rod 2 are tightly connected together by spirally screwing the end of the connecting rod 2 into the interior of the molded body 1. Then, the anti-rotation pin 3 is inserted into the pin holes of the connecting rod 2 and the threaded rod 15 to axially limit the two, so that the molded body 1 and the connecting rod 2 will not loosen after being connected, ensuring that the molded body 1 will not shake during the molding of the product. Secondly, the angle formed between the rectangular molding surface 11 and the second molding surface 13 is 155°-170°, so that the burrs formed on the inner hole of the product after processing can be ignored.

[0024] See also Figure 1 In one embodiment, in order to facilitate the rotation of the connecting rod 2 to connect the molded body 1 and the connecting rod 2 together, in this embodiment, preferably, a flat square groove 21 is provided on the outer circumferential surface of the connecting rod 2, and both end surfaces of the connecting rod 2 are provided with internal thread grooves 22, and an auxiliary rod is inserted into the flat square groove 21. By rotating the auxiliary rod to make it rotate along the axial direction of the connecting rod 2, the difficulty of rotating the connecting rod 2 by hand can be reduced to a certain extent.

[0025] See also Figure 3 In one embodiment, in this embodiment, preferably, pin holes are processed on the threaded rod 15 and the connecting rod 2, and the pin holes are adapted to the anti-rotation pin 3, and the diameter of the anti-rotation pin 3 is φ2cm-φ4cm, so as to ensure that the end of the anti-rotation pin 3 can be smoothly inserted into the pin hole to complete the axial rotation of the molded body 1 and the connecting rod 2.

[0026] The working principle and use process of the utility model are as follows: the raw material is fed into the mold through a press, and the mold is used to press the product, wherein the inner diameter of the product is formed by the forming body 1, and the angle of the keyway of the part after forming is 155°-170°, and the pressed blank is sintered by a powder metallurgy sintering process to make the product have corresponding hardness and strength, and the inner diameter of the product is turned, and the angle of the keyway of the product is 155°-170°, forming an angular effect, see Figure 6 After turning, there are almost no burrs on the edges and corners of the product, or even a small amount of burrs can be easily removed with a brush.

[0027] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0028] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A die structure for eliminating inner hole machining burrs of an oil pump rotor, characterized in that: The invention comprises a molded body (1) and a connecting rod (2) inserted into the molded body (1); an anti-rotation pin (3) is inserted into the connecting rod (2) to limit the rotation of the molded body (1) and the connecting rod (2); the outer peripheral surface of the molded body (1) is set as an arc surface, and the arc surface is composed of a rectangular molding surface (11), a first molding surface (12), and a second molding surface (13) which are tangent to each other in sequence.

2. The die structure for eliminating inner hole machining burrs of an oil pump rotor according to claim 1 is characterized in that: The first molding surface (12) is connected to the rectangular molding surface (11) by a rounded transition, and the angle between the first molding surface (12) and the second molding surface (13) is 10°-25°.

3. The die structure for eliminating inner hole machining burrs of an oil pump rotor according to claim 1 is characterized in that: The end surface of the molded body (1) connected to the connecting rod (2) is provided with a cavity (14), and a threaded rod (15) is installed inside the cavity (14).

4. The die structure for eliminating inner hole machining burrs of an oil pump rotor according to claim 3 is characterized in that: The outer peripheral surface of the connecting rod (2) is provided with a flat square groove (21), and both end surfaces of the connecting rod (2) are provided with internal thread grooves (22).

5. The die structure for eliminating inner hole machining burrs of an oil pump rotor according to claim 4 is characterized in that: The outer diameter of the connecting rod (2) matches the inner diameter of the cavity (14), and the outer thread on the threaded rod (15) matches the inner thread of the inner thread groove (22).

6. The die structure for eliminating inner hole machining burrs of an oil pump rotor according to claim 3, characterized in that: The threaded rod (15) and the connecting rod (2) are both processed with pin holes, and the pin holes are adapted to the anti-rotation pin (3).

7. The die structure for eliminating inner hole machining burrs of an oil pump rotor according to claim 1, characterized in that: The anti-rotation pin (3) has a diameter of φ2cm-φ4cm.

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