Cylindrical hole grinding tool

Abstract

The utility model provides a cylindrical hole grinding tool which is composed of a taper tip rod and a slotting inner cone grinding sleeve. The taper tip rod is matched with the coaxial conical surface of the slotting inner cone grinding sleeve; the slotted inner cone grinding sleeve is provided with an axial slot for expansion; the axial displacement of the taper pin rod is converted into radial expansion of the slotting inner cone grinding sleeve, the slotting inner cone grinding sleeve makes contact with a workpiece hole to be machined, and the tool is driven by a machine tool to rotate to grind and machine the workpiece hole. The technical problem of batch, efficient and low-cost machining of high-precision holes of parts is solved in a grinding machining mode, the structure is simple, precision is high, operation is convenient, and clamping is convenient and fast.

Description

Technical Field

[0001] This utility model belongs to the field of precision machining technology for machined holes in parts, specifically relating to a cylindrical hole grinding tool for machining precision holes in mold parts. Background Technology

[0002] Currently, mechanical manufacturing enterprises generally use turning, drilling, boring, and grinding methods to process cylindrical holes on parts. While traditional processing methods can achieve high precision requirements, they cannot meet the ideal requirements for parts that demand high precision, low surface roughness, and good fit. Therefore, the following improved technical solutions are proposed. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a cylindrical hole grinding tool, which solves the problem of batch, high-efficiency and low-cost processing of high-precision holes in parts by using grinding.

[0004] The technical solution adopted by this utility model is as follows: a cylindrical hole grinding tooling, which consists of a tapered pin and a slotted inner tapered grinding sleeve; the tapered pin and the slotted inner tapered grinding sleeve are coaxially fitted with a tapered surface; the slotted inner tapered grinding sleeve is provided with an axial slot for expansion; the axial displacement of the tapered pin is converted into the radial expansion of the slotted inner tapered grinding sleeve, and the slotted inner tapered grinding sleeve contacts the hole of the workpiece to be processed, and the workpiece hole is ground by the rotation of the tooling driven by the machine tool.

[0005] In the above technical solution, the preferred embodiment is that the tapered tip has a conical structure adapted to the coaxial conical surface of the slotted inner conical grinding sleeve; the slotted inner conical grinding sleeve has an inner conical hole adapted to the conical structure.

[0006] In the above technical solution, the preferred ratio is 1:50 between the taper surface of the vertebral structure and the inner conical foramen.

[0007] In the above technical solution, the preferred embodiment is that the grooved inner cone grinding sleeve is coated with grinding paste; the grinding paste is made by mixing grinding powder and kerosene in a certain proportion.

[0008] In the above technical solution, the preferred embodiment is: the taper pin is made of 45 steel with a tempered hardness of 30-35 HRC; the slotted inner cone grinding sleeve is made of ferritic lamellar HT150 or ferritic lamellar HT200.

[0009] In the above technical solution, the preferred configuration is: the wall thickness of the grooved inner cone grinding sleeve is 0.5-2mm; the number of axial grooves in the grooved inner cone grinding sleeve is 1-6.

[0010] The above technical solution further includes a special grinding chuck. After the special grinding chuck is coaxially adapted with the tooling, the special grinding chuck is clamped and adapted to the special grinding equipment.

[0011] The advantages of this utility model compared with the prior art are: the utility model has a simple structure, high processing accuracy, and is easy to operate. For parts with high hole accuracy requirements, this tooling can be used not only on special grinding machines, but also on general machine tools such as rotary machines and drilling machines, to achieve quick clamping, precision machining, and mass production, effectively solving various technical problems encountered in the high-precision hole machining of parts. Attached Figure Description

[0012] Figure 1 This is a structural diagram of the tooling of this utility model when the diameter of the hole being machined is greater than φ16;

[0013] Figure 2 for Figure 1 Structural diagram of the tapered pin of the tooling;

[0014] Figure 3 for Figure 1 Structural diagram of the slotted inner cone grinding sleeve of the tooling;

[0015] Figure 4 for Figure 3 A cross-sectional view of the slotted inner cone grinding sleeve (AA section);

[0016] Figure 5 This is a structural diagram of the tooling of this utility model when the diameter of the hole to be processed is less than or equal to φ16;

[0017] Figure 6 for Figure 5 Structural diagram of the tapered pin of the tooling;

[0018] Figure 7 for Figure 5 Structural diagram of the slotted inner cone grinding sleeve of the tooling;

[0019] Figure 8 for Figure 7 Side view of the slotted inner cone grinding sleeve;

[0020] Figure 9 This is a structural diagram of a dedicated grinding chuck;

[0021] Figure 10 for Figure 9 Specialized grinding chuck assembly Figure 1 A 3D view of the tooling shown;

[0022] Figure 11 for Figure 9 Specialized grinding chuck assembly Figure 5 A 3D view of the tooling shown;

[0023] In the figure: 1-tapered pin, 2-grooved inner cone grinding sleeve, 3-special grinding chuck. Detailed Implementation

[0024] The following will refer to the appendix in the embodiments of this utility model. Figure 1-11 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] (like Figure 1 , Figure 5 (As shown) A cylindrical hole grinding fixture consists of a tapered pin 1 and a slotted inner tapered grinding sleeve 2. The tapered pin 1 and the slotted inner tapered grinding sleeve 2 are coaxially fitted with a tapered surface. The slotted inner tapered grinding sleeve 2 has an axial slot for expansion; the axial displacement of the tapered pin 1 is converted into radial expansion of the slotted inner tapered grinding sleeve 2, which then contacts the hole of the workpiece to be processed. The machine tool drives the fixture to rotate and grind the workpiece hole.

[0026] It should be noted that the tapered pin 1 and the slotted inner conical grinding sleeve 2 adopt a coaxial conical surface design, ensuring a tight fit between them. This design not only improves the stability and reliability of the tooling but also allows the grinding sleeve to be adjusted according to different tapered pins, thus adapting to the grinding requirements of workpiece holes of different sizes. The axial displacement of the tapered pin 1 can be converted into radial expansion of the slotted inner conical grinding sleeve 2. This characteristic allows the slotted inner conical grinding sleeve 2 to fit tightly against the inner wall of the workpiece hole to be processed, ensuring the uniformity and consistency of the grinding effect. Grinding is performed by rotating the tooling driven by the machine tool. This mechanized operation greatly improves grinding efficiency and reduces the tediousness and uncertainty of manual operation. The tooling design enables high precision to be maintained during the grinding process, meeting the stringent requirements of the workpiece hole for size, geometry, and surface roughness.

[0027] In the above embodiments, preferably: the tapered pin 1 has a conical structure adapted to the coaxial conical surface of the slotted inner conical grinding sleeve 2; the slotted inner conical grinding sleeve 2 has an inner conical hole adapted to the conical structure.

[0028] In specific applications: (e.g.) Figures 1 to 4(As shown) When the diameter of the hole to be machined is greater than Ф16, the slotted inner tapered grinding sleeve 2 is clamped on the machine tool chuck and connected to the machine tool spindle. The tapered part of the taper pin 1 is inserted into the tapered hole of the slotted inner tapered grinding sleeve 2. When the exposed end of the taper pin 1 is struck, the taper pin 1 will move axially towards the tapered hole of the slotted inner tapered grinding sleeve 2. At the same time, the thin-walled part of the slotted inner tapered grinding sleeve 2 is subjected to external force and expands radially, thereby increasing the outer diameter of the slotted inner tapered grinding sleeve 2. When the slotted inner tapered grinding sleeve 2 is in full contact with the hole of the workpiece, the rotation of the machine tool spindle will drive the slotted inner tapered grinding sleeve 2 and the taper pin 1 to rotate and grind the hole in the workpiece while the workpiece remains stationary. During processing, the operator only needs to apply grinding paste evenly to the outer contact part of the slotted inner tapered grinding sleeve 2 with a brush to achieve the purpose of grinding a high-precision hole.

[0029] (like Figures 5 to 8 (As shown) When the diameter of the hole to be machined is less than or equal to Ф16, the taper pin 1 is clamped on the machine tool chuck and connected to the machine tool spindle. The inner taper hole of the slotted inner taper grinding sleeve 2 is inserted into the taper part of the taper pin 1. When the end face of the slotted inner taper grinding sleeve 2 is struck, the slotted inner taper grinding sleeve 2 will move axially along the taper part of the taper pin 1. At the same time, the thin-walled part of the slotted inner taper grinding sleeve 2 will expand radially under the action of external force, thereby increasing the outer diameter of the slotted inner taper grinding sleeve 2. When the slotted inner taper grinding sleeve 2 is in full contact with the hole of the workpiece, the rotation of the machine tool spindle will drive the taper pin 1 and the slotted inner taper grinding sleeve 2 to rotate and grind within the hole of the workpiece, while the workpiece remains stationary. During processing, the operator only needs to apply grinding paste evenly to the contact part of the outer circular surface of the slotted inner taper grinding sleeve 2 with a brush to achieve the purpose of grinding high-precision holes.

[0030] In the above embodiments, preferably, the taper ratio between the conical structure and the inner conical hole is 1:50. This 1:50 taper design ensures that during grinding, the grinding sleeve can apply grinding pressure evenly and stably to the inner wall of the workpiece hole, avoiding problems such as uneven grinding or workpiece deformation caused by uneven pressure. The 1:50 taper design also makes it easy to control the expansion of the grinding sleeve by adjusting the axial displacement of the taper pin, thereby achieving precise adjustment and control of the grinding accuracy.

[0031] In the above embodiments, preferably, the slotted inner cone grinding sleeve 2 is coated with grinding paste; the grinding paste is a mixture of grinding powder and kerosene in a specific ratio. Kerosene, as a diluent, effectively reduces the viscosity of the grinding paste, making it easier to apply and flow. This helps the grinding paste to be distributed more evenly on the surface of the grinding sleeve, thereby improving grinding efficiency. The volatility of kerosene allows the grinding paste to evaporate rapidly during the grinding process, carrying away the heat and metal shavings generated during grinding, keeping the grinding area clean and cool. This helps reduce thermal deformation and wear during the grinding process, further improving grinding efficiency. The grinding powder, as an abrasive, can act more evenly on the inner wall of the workpiece hole under the action of kerosene. Kerosene, as a carrier, can transport the grinding powder to the tiny unevenness of the inner wall of the workpiece hole, achieving a finer grinding effect. The mixed use of kerosene and grinding powder allows the grinding paste to act more evenly on the inner wall of the workpiece hole during the grinding process, thereby achieving a higher surface finish, which is particularly important for workpieces requiring high precision and high surface quality. Kerosene, as a lubricant, reduces friction and wear between the grinding powder and the inner wall of the workpiece hole, thereby reducing scratches. This helps protect the integrity of the workpiece hole's inner wall and extends the workpiece's service life. Diluted kerosene grinding paste is easier to apply to the grooved inner cone grinding sleeve, reducing operational difficulty and time. After grinding, the kerosene evaporates quickly, making grinding paste residue easier to clean and reducing subsequent cleaning workload.

[0032] In the above embodiments, preferably: the tapered pin 1 is 45 steel with a tempered hardness of 30-35 HRC; the slotted inner cone grinding sleeve 2 is ferritic lamellar HT150 or ferritic lamellar HT200. 45 steel with a tempered hardness of 30-35 HRC possesses both sufficient hardness and good toughness. This hardness range allows the tapered pin to withstand significant pressure and wear during grinding, while remaining resistant to breakage or deformation. After tempering, the wear resistance of 45 steel is significantly improved, which helps extend the service life of the tapered pin, reduce replacement frequency, and thus lower production costs. Tempered 45 steel exhibits superior mechanical properties, such as tensile strength, yield strength, and impact toughness. These properties enable the tapered pin 1 to maintain stable performance during grinding, ensuring the stability and consistency of the grinding effect. Ferritic lamellar HT150 and HT200 both possess good wear resistance, allowing the slotted inner cone grinding sleeve 2 to maintain wear stability for a longer period during grinding, extending its service life. HT150 and HT200 have high tensile and compressive strengths, meeting the strength and hardness requirements of the grinding sleeve during grinding. This helps ensure that the grinding sleeve is not damaged by excessive force during grinding. Gray cast iron (such as HT150 and HT200) has good shock absorption properties, which helps reduce vibration and noise generated during grinding, improving the stability and comfort of the grinding process. Both HT150 and HT200 have good casting and machining properties, making the manufacturing of grinding sleeves easier and able to meet the grinding needs of different sizes and shapes. Therefore, the combined design of the tapered pin 1 and the slotted inner conical grinding sleeve 2 allows them to fit tightly together, ensuring the stability and accuracy of the grinding process. At the same time, this combined design also allows the grinding fixture to adapt to the grinding needs of workpiece holes of different sizes and shapes. The hardness and wear resistance of the tapered pin 1 ensure the stability and accuracy of the grinding process, while the wear resistance and shock absorption properties of the slotted inner conical grinding sleeve 2 help improve the grinding effect and workpiece surface quality. Since both the tapered pin 1 and the slotted inner cone grinding sleeve 2 have good wear resistance and mechanical properties, this combination of grinding fixtures has a long service life, which helps to reduce production costs and replacement frequency, and improve production efficiency.

[0033] In the above embodiments, preferably: the wall thickness of the slotted inner cone grinding sleeve 2 is 0.5-2mm; the number of axial slots in the slotted inner cone grinding sleeve 2 is 1-6. Specifically: when the diameter of the hole to be processed is greater than Ф16, the number of axial slots in the slotted inner cone grinding sleeve 2 is 3-6. When the diameter of the hole to be processed is less than or equal to Ф16, the number of axial slots in the slotted inner cone grinding sleeve 2 is 1.

[0034] The wall thickness, ranging from 0.5 to 2 mm, ensures the grinding sleeve possesses sufficient strength and rigidity to withstand the pressure and wear during grinding, while avoiding material waste and increased processing difficulty due to excessive thickness. A thinner wall thickness helps reduce the overall weight of the grinding sleeve, making the grinding process more flexible and convenient, and reducing energy consumption. Appropriate wall thickness facilitates heat conduction and dissipation during grinding, preventing deformation or damage due to overheating. Adjusting the number of axial slots according to the size of the hole being processed reflects the flexibility and adaptability of the grinding sleeve design. Increasing the number of slots for large diameters enhances grinding efficiency and heat dissipation; decreasing the number of slots for small diameters maintains sufficient strength and rigidity. When the hole diameter is greater than Ф16, selecting 3-6 axial slots significantly improves grinding efficiency and heat dissipation. Multiple slots also help ensure uniform distribution and flow of the abrasive, preventing accumulation and clogging. When the hole diameter is less than or equal to Ф16, selecting one axial slot maintains sufficient strength and rigidity of the grinding sleeve. At the same time, the individual slots also help the abrasive to be distributed and flow evenly, ensuring the stability and accuracy of the grinding process.

[0035] In the above embodiments, further: (e.g.) Figures 9 to 11 (As shown) It also includes a special grinding chuck 3. After the special grinding chuck 3 is coaxially adapted with the tooling, the special grinding chuck 3 is clamped and adapted to the special grinding equipment.

[0036] Preferably, one end of the dedicated grinding chuck 3 is provided with a tapered shank adapted for clamping with a dedicated grinding equipment, and the other end of the dedicated grinding chuck 3 is provided with a cylindrical sleeve coaxially and tightly fitted to the cylindrical structure of the tooling of this utility model. In use, if the tooling of this utility model needs to be used on a dedicated grinding equipment, the dedicated grinding chuck 3 (e.g., ...) is used... Figure 7 (As shown) Positioning fixtures offer superior performance.

[0037] In practice, the tooling design and processing of this utility model can achieve a hole accuracy of 0.001mm and a surface roughness of Ra0.05μm or higher.

[0038] The above description shows that in production practice, this tooling is environmentally friendly and low-consumption, and can achieve precision machining of holes. Especially in the machining of mold parts, its flexibility and practicality play an irreplaceable role, achieving good economic and social benefits.

[0039] This tooling allows for the precision machining of holes in batches of sleeve-type parts. Furthermore, by changing parameters such as the outer diameter of the slotted inner cone grinding sleeve 2, the number of slots, and the outer diameter and taper length of the taper pin 1, it can meet the machining needs of different hole diameters, through holes, and blind holes, demonstrating ideal versatility.

[0040] Higher precision requirements can be achieved by reducing the surface roughness of the pores through changes in the particle size and concentration of the polishing paste. However, regardless of the method, since their working principle is the same, they all fall within the protection scope of this device.

[0041] This invention effectively solves the precision machining problem of holes on parts in machining production, providing a new approach to achieving part interchangeability requirements. Compared with existing technologies, this tooling has a simple and reasonable structure, low manufacturing cost, quick operation, high precision and reliability, light weight, convenient and quick installation, and is low-carbon and environmentally friendly, enabling high-precision machining of holes on parts.

[0042] In summary, this utility model has a simple structure, high machining accuracy, and is easy to operate. For parts with high hole accuracy requirements, this tooling can be used not only on special grinding machines but also on general machine tools such as rotary machines and drilling machines, enabling rapid clamping, precision machining, and mass production, effectively solving various technical problems encountered in high-precision hole machining of parts.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications and equivalent substitutions made within the spirit and principles of the present utility model are included within the scope of protection of the present utility model.

Claims

1. A cylindrical hole lapping tool characterized by: It is composed of taper stick (1) and slotted inner taper grinding sleeve (2); the taper stick (1) is coaxial with the slotted inner taper grinding sleeve (2); the slotted inner taper grinding sleeve (2) is provided with axial slots for expansion; axial displacement of the taper stick (1) is converted into radial expansion of the slotted inner taper grinding sleeve (2), the slotted inner taper grinding sleeve (2) is in contact with the hole of the workpiece to be processed, and the workpiece hole is ground by rotating the tool driven by the machine tool.

2. The cylindrical hole lapping tool of claim 1, wherein: The taper stick (1) is provided with a cone structure coaxial with the taper surface of the slotted inner taper grinding sleeve (2); the slotted inner taper grinding sleeve (2) is provided with an inner taper hole matched with the cone structure.

3. The cylindrical hole lapping tool of claim 2, wherein: The taper surface of the cone structure and the inner taper hole is 1:

50.

4. The cylindrical hole lapping tool according to claim 1 or 2, wherein: The slotted inner taper grinding sleeve (2) is coated with grinding paste.

5. The cylindrical hole polishing tool according to claim 1 or 2, wherein: The taper stick (1) is 45 steel with a tempered hardness of 30-35HRC; the slotted inner taper grinding sleeve (2) is ferrite flake HT150 or ferrite flake HT200.

6. The cylindrical hole lapping tool of claim 1, wherein: The wall thickness of the slotted inner taper grinding sleeve (2) is 0.5-2mm; the number of axial slots of the slotted inner taper grinding sleeve (2) is 1-6.

7. The cylindrical hole lapping tool of claim 1, wherein: It also includes a special grinding chuck (3), which is coaxially matched with the tool, and the special grinding chuck (3) is clamped and matched in the special grinding equipment.

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