Small hole internal thread grinding head

Abstract

The invention relates to a small hole internal thread grinding head which comprises a base, a sleeve, a straight grinding rod and a grinding head body, the base is installed at the rear end of the sleeve, a bent section is formed at the front end of the sleeve, the straight grinding rod is rotatably installed in the straight section of the sleeve through a bearing unit, one end of the straight grinding rod extends to the base, and the other end of the straight grinding rod extends to the bent section of the sleeve. One end of the straight grinding rod is connected with the bent section, the other end of the straight grinding rod extends to the bent section to form a straight grinding rod bevel gear, and the grinding head is mounted on the bent section and is in transmission connection with the straight grinding rod. The grinding head has the advantages that the speed of the grinding head can be increased due to the adoption of integrated sleeve machining, heat dissipation can be increased in the grinding process due to the fact that the oil injection port is additionally formed in the outer portion of the sleeve, and the requirement for the higher grinding speed can be met.

Description

Technical Field

[0001] The invention relates to a small hole internal thread grinding head and belongs to the field of grinding. Background Art

[0002] In the field of modern mechanical processing, internal thread grinding is a common processing technology, especially in the processing of small hole internal threads with high precision and complex shapes. However, the grinding head device used for internal thread grinding in the prior art has significant technical limitations, especially in high-speed and high-precision processing scenarios, its performance and reliability are difficult to meet actual needs.

[0003] In the prior art, internal thread grinding heads usually use a split wire connection method to fix the grinding rod and the grinding head in a sleeve. Although this design can meet certain processing requirements under low speed conditions, it exposes many problems during high-speed processing. First, the mechanical strength of the wire connection is low and cannot withstand the centrifugal force and cutting force caused by high-speed rotation. When the speed exceeds a certain threshold, the steel wire will gradually lose its elasticity due to thermal expansion, and may eventually cause breakage. This breakage will not only damage the processing equipment, but may also pose a safety hazard to the operator.

[0004] Secondly, the thermal expansion effect of the wire connection directly affects the processing accuracy. During high-speed grinding, the thermal expansion of the wire will cause the grinding head to shift, thus affecting the processing accuracy of the thread. In addition, the lack of rigidity of the wire connection makes the grinding head prone to vibration during processing, further reducing the processing quality.

[0005] Furthermore, the existing split wire connection method limits the improvement of grinding rate. Since the wire connection cannot withstand high speed, the grinding rate is forced to decrease, resulting in a significant increase in processing time. The extension of processing time not only reduces production efficiency, but also increases processing costs, especially in mass production, the cumulative effect of this cost is particularly obvious.

[0006] In addition, the insufficient heat dissipation performance of the existing technology is also an important problem. During high-speed grinding, a large amount of heat is generated in the grinding area, and the heat dissipation capacity of the wire connection is poor, which cannot effectively reduce the temperature of the grinding head and grinding rod. Excessive temperature will not only accelerate the aging and breakage of the wire, but also cause increased wear of the grinding wheel, further affecting the processing accuracy and equipment life.

[0007] In summary, the internal thread grinding head device of the prior art has obvious limitations in high-speed and high-precision processing scenarios, including insufficient mechanical strength, significant thermal expansion effect, limited grinding rate, poor heat dissipation performance and other problems. These problems not only limit the improvement of processing efficiency, but also increase processing costs and equipment maintenance difficulties. Therefore, developing an internal thread grinding device that can meet the needs of high-speed and high-precision processing is a technical problem that needs to be solved urgently in the current mechanical processing field. Summary of the invention

[0008] In order to overcome the defects of the prior art, the present invention provides a small hole internal thread grinding head, and the technical solution of the present invention is: A small hole internal thread grinding head comprises a base, a sleeve, a straight grinding rod and a grinding head. The rear end of the sleeve is installed with the base, and the front end forms a bending section. A straight grinding rod is rotatably installed inside the straight section of the sleeve through a bearing unit. One end of the straight grinding rod extends to the base, and the other end extends to the bending section to form a straight grinding rod bevel gear. The grinding head is installed on the bending section, and the grinding head is transmission-connected to the straight grinding rod.

[0009] The grinding head includes a grinding wheel, a grinding head screw and a locking nut. The grinding head screw is rotatably installed on the bending section of the sleeve through a cross needle bearing. The grinding head screw is coaxially arranged with the bending section. The inner end of the grinding head screw forms a grinding head screw bevel gear, and the outer end is sequentially installed with the grinding wheel and locking nut after passing through the bending section. The grinding wheel is fixed to the grinding head screw through the locking nut; the grinding head screw bevel gear is meshed with the straight grinding rod bevel gear.

[0010] A limit seat is installed in the base, and one end of the straight grinding rod extends into the limit seat and is threadedly connected with the limit seat.

[0011] The bearing unit comprises a ball bearing and a cross needle bearing. The ball bearing is installed between the rear part of the straight grinding rod and the sleeve, and the cross needle bearing is installed between the front part and the sleeve.

[0012] A plurality of oil filling holes are installed on the sleeve.

[0013] The transmission ratio of the grinding head screw bevel gear to the straight grinding rod bevel gear is 2:1.

[0014] The advantages of the present invention are: (1) The one-piece sleeve processing is adopted to increase the speed of the grinding head, and an oil filling port is added to the outside of the sleeve to increase heat dissipation during the grinding process, which can meet a faster grinding rate.

[0015] (2) The transmission ratio between the grinding head screw bevel gear and the straight grinding rod bevel gear is 2:1, which makes the transmission process more stable and efficient, further improves the grinding rate and reduces the processing cost.

[0016] (3) The cross needle bearing is used to fix the grinding head and the straight grinding rod, making the positioning and movement process more precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the main structure of the present invention.

[0018] Figure 2 yes Figure 1 Left view of .

[0019] Figure 3 yes Figure 1 sectional view of . DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with specific embodiments, and the advantages and features of the present invention will become clearer as the description proceeds. However, these embodiments are exemplary only and do not constitute any limitation to the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solution of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the scope of protection of the present invention.

[0021] See also Figures 1 to 3 The present invention relates to a small hole internal thread grinding head, comprising a base 3, a sleeve 1, a straight grinding rod 4 and a grinding head. The rear end of the sleeve 1 is installed with the base 3, and the front end forms a bending section. A straight grinding rod 4 is rotatably installed inside the straight section of the sleeve 1 through a bearing unit. The straight grinding rod 4 is coaxially arranged with the straight section of the sleeve 1. One end of the straight grinding rod 4 extends to the base 3, and the other end extends to the bending section to form a straight grinding rod bevel gear 5. The grinding head is installed on the bending section, and the grinding head is transmission-connected to the straight grinding rod 4.

[0022] Based on the above structure, the following advantages are achieved: 1. Compact structure and strong adaptability The bending section design of the sleeve: The bending section at the front end of the sleeve enables the grinding head to flexibly adapt to the processing requirements of the internal threads of small holes. Especially when space is limited, the bending section can more conveniently enter the small hole and improve the accessibility of processing.

[0023] Combination of bending section and grinding head: The grinding head is installed on the bending section. This design not only saves space, but also ensures the fit between the grinding head and the processing surface to avoid interference problems.

[0024] 2. High-precision transmission Bevel gear transmission: The bevel gear at the end of the straight grinding rod is connected to the grinding head through a bevel gear transmission. This design can achieve efficient and stable force transmission. The transmission ratio of the bevel gear can be optimized according to actual needs, thereby improving grinding accuracy and efficiency.

[0025] High transmission efficiency: Bevel gear transmission can effectively reduce energy loss, ensure the stability of the grinding head during high-speed rotation, and avoid the reduction of processing accuracy due to transmission error.

[0026] 3. Stability and mechanical strength Bearing unit support: The straight grinding rod is installed inside the straight section of the sleeve through the bearing unit. This design can effectively reduce friction and improve the rotation stability of the grinding rod. The bearing unit can withstand radial and axial forces to ensure the rigidity and precision of the grinding rod when rotating at high speed.

[0027] Coaxial design: The straight grinding rod and the straight section of the sleeve are coaxially arranged. This design can reduce the influence of eccentric force and avoid vibration of the grinding rod during rotation, thereby improving the processing quality.

[0028] 4. Efficient heat dissipation and long life Low friction design of the bearing unit: The low friction characteristics of the bearing unit can reduce heat generation and extend the service life of the grinding rod and grinding head.

[0029] Structural optimization: The coaxial design of the bending section of the sleeve and the straight grinding rod can reduce unnecessary energy loss and further reduce the heat generated by the equipment.

[0030] 5. Adapt to complex processing requirements Flexibility of bending section and grinding head: The design of the bending section enables the grinding head to adapt to the complex geometry of small hole internal threads, especially when processing large-angle threads, which can effectively avoid interference problems.

[0031] High-precision machining capability: The combination of bevel gear transmission and bearing unit ensures the stability of the grinding head at high-speed rotation, thus meeting the needs of high-precision machining.

[0032] 6. High space utilization The straight section and the bent section of the sleeve are combined: the straight section of the sleeve provides stable support for the straight grinding rod, while the bent section provides flexible processing space for the grinding head. This design achieves efficient functional integration in a limited space.

[0033] The design of this small hole internal thread grinding head not only improves the processing accuracy and efficiency, but also enhances the stability and adaptability of the equipment through the combination of bending sections, bevel gear transmission, bearing units and modular structure. Its compact structure and flexible processing capabilities make it particularly suitable for the high-precision processing requirements of small hole internal threads, while reducing maintenance costs and extending the service life of the equipment.

[0034] The grinding head includes a grinding wheel 9, a grinding head screw 8 and a locking nut 10. The grinding head screw 8 is rotatably installed on the bending section of the sleeve 1 through a cross needle bearing 7. The grinding head screw 8 is coaxially arranged with the bending section. The inner end of the grinding head screw 8 forms a grinding head screw bevel gear 6, and the outer end passes through the bending section and is sequentially installed with the grinding wheel 9 and the locking nut 10. The grinding wheel 9 is fixed to the grinding head screw 8 through the locking nut 10; the grinding head screw bevel gear 6 is meshed with the straight grinding rod bevel gear 5.

[0035] This grinding head design combines a variety of innovative structures and has the following advantages: 1. High-precision rotation and stability Crossed needle roller bearing installation: The grinding head screw is installed in the bending section of the sleeve through a cross needle roller bearing. This design can withstand large radial and axial loads, ensuring the stability and accuracy of the grinding head when rotating at high speed.

[0036] Coaxial setting: The grinding head screw and the bending section are coaxially set, which reduces the influence of eccentric force and avoids vibration during rotation, thereby improving the processing quality.

[0037] 2. Efficient transmission and flexibility Bevel gear transmission: The bevel gear of the grinding head screw is meshed with the bevel gear of the straight grinding rod. This bevel gear transmission design can achieve efficient and stable force transmission, while changing the direction of force transmission, so that the grinding head can flexibly adapt to the processing needs of small hole internal threads.

[0038] Transmission ratio optimization: The transmission ratio of the bevel gear can be optimized according to actual processing requirements to further improve grinding efficiency and precision.

[0039] 3. Stability and replaceability of grinding wheels Grinding wheel locking design: The grinding wheel is fixed to the outer end of the grinding head screw through a locking nut. This design ensures the stability of the grinding wheel during high-speed rotation, and facilitates the rapid replacement of grinding wheels of different specifications to meet different processing requirements.

[0040] 4. Compact structure and strong adaptability Bending section design: The grinding head is installed in the bending section of the sleeve. This design allows the grinding head to easily enter the small hole and adapt to the complex small hole internal thread processing needs.

[0041] High space utilization: The compact layout of the grinding head screw and grinding wheel realizes efficient functional integration in a limited space and improves the overall performance of the equipment.

[0042] 5. High-speed grinding capability High rigidity design: The combination of crossed needle roller bearings and coaxial settings increases the mechanical strength of the grinding head, enabling it to withstand higher rotation speeds, thus achieving faster grinding rates.

[0043] Heat dissipation performance: The structural design takes heat dissipation requirements into consideration, reduces the impact of high temperature on the grinding head and grinding wheel, and extends the service life of the equipment.

[0044] 6. Accurate force transmission and processing accuracy Precise meshing of bevel gears: The precise meshing of the grinding head screw bevel gear and the straight grinding rod bevel gear ensures efficient force transmission, reduces transmission errors, and thus improves machining accuracy.

[0045] Angle adaptability: Bevel gear transmission can adapt to different processing angle requirements, especially when processing large-angle threads, it can effectively avoid interference problems.

[0046] This grinding head design not only improves the rotation accuracy and stability of the grinding head through the combination of cross needle bearings, bevel gear transmission, coaxial setting and modular structure, but also enhances its high-speed grinding ability and adaptability. Its compact structure and flexible processing capabilities make it particularly suitable for the high-precision processing requirements of small hole internal threads, while reducing maintenance costs and extending the service life of the equipment.

[0047] A limit seat 2 is installed in the base 3 , and one end of the straight grinding rod 4 extends into the limit seat 2 and is threadedly connected to the limit seat 2 .

[0048] The bearing unit comprises a ball bearing 12 and a cross needle bearing 7. The ball bearing 12 is installed between the rear portion of the straight grinding rod and the sleeve 1, and the cross needle bearing 7 is installed between the front portion and the sleeve.

[0049] This bearing unit structure combines the advantages of ball bearings and crossed needle roller bearings and has the following advantages: 1. High precision and stability Application of cross needle roller bearings: Cross needle roller bearings are installed between the front of the straight grinding rod and the sleeve. They can withstand large radial and axial loads and ensure the stability of the grinding head during high-speed rotation. This bearing design reduces vibration during rotation and improves processing accuracy.

[0050] Application of ball bearings: Ball bearings are installed between the rear of the straight grinding rod and the sleeve, providing low-friction rotation support to ensure the stability of the straight grinding rod when rotating at high speed.

[0051] 2. High-speed rotation capability Low friction design: The combination of ball bearings and crossed needle bearings reduces the friction between the straight grinding rod and the sleeve, allowing the grinding head to run at a higher speed, thereby improving grinding efficiency.

[0052] Heat dissipation performance: The design of the bearing unit takes heat dissipation requirements into consideration, reducing the impact of high temperature on the bearing and grinding head and extending the service life of the equipment.

[0053] 3. Compact structure and strong adaptability Space optimization: The combined design of ball bearings and crossed needle roller bearings achieves efficient functional integration in a limited space and improves the overall performance of the equipment.

[0054] Flexibility: This structural design allows the grinding head to adapt to the needs of small hole internal thread processing of different specifications, especially when space is limited.

[0055] 4. High load capacity High load-bearing characteristics of crossed needle roller bearings: Crossed needle roller bearings can withstand large radial and axial loads, ensuring that the grinding head will not be damaged due to overload during processing.

[0056] Auxiliary support of ball bearings: Ball bearings provide additional support and enhance the mechanical strength of the entire structure.

[0057] 5. Heat dissipation and lubrication Integration of oil filling port: An oil filling port is set on the outside of the sleeve to provide lubrication and heat dissipation for the bearing unit during the grinding process, further improving the reliability and service life of the equipment.

[0058] The bearing unit structure combines ball bearings and cross needle bearings, which not only improves the rotation accuracy and stability of the grinding head, but also enhances its high-speed grinding ability and adaptability. Its compact structure and flexible processing capabilities make it particularly suitable for the high-precision processing requirements of small hole internal threads, while reducing maintenance costs and extending the service life of the equipment.

[0059] Several oil injection holes 11 are installed on the sleeve 1. Multiple oil injection holes can ensure that the lubricant is evenly distributed to various friction points inside the sleeve, including key parts such as bearings, grinding rods and grinding heads. This design can effectively reduce friction and extend the service life of the equipment. The oil injection holes are not only used to inject lubricants, but also help to discharge heat during the grinding process. The lubricant takes away heat during the flow process, thereby reducing the temperature of the grinding head and grinding rod, and avoiding equipment damage caused by high temperature.

[0060] The transmission ratio of the grinding head screw bevel gear 6 to the straight grinding rod bevel gear 5 is 2:1.

[0061] The working principle of the present invention is: 1. Power transmission and rotation Power source: The power source (such as a motor) transmits the rotational power to the straight grinding rod 4 through the base 3. The straight grinding rod 4 is installed inside the straight section of the sleeve 1 and supported by the bearing unit (ball bearing 12 and cross needle bearing 7) to ensure its stability and accuracy when rotating at high speed.

[0062] Bevel gear transmission: The front end of the straight grinding rod 4 forms a straight grinding rod bevel gear 5, which meshes with the grinding head screw bevel gear 6. The bevel gear transmission ratio is 2:1, which can optimize the rotation speed and torque of the grinding head and ensure efficient and stable force transmission.

[0063] 2. Grinding head rotation and grinding Grinding head rotation: Grinding head screw 8 is installed in the bending section of sleeve 1 through cross needle bearing 7, and is connected to grinding head screw bevel gear 6. When straight grinding rod 4 rotates, power is transmitted to grinding head screw 8 through bevel gear transmission, making it rotate at high speed.

[0064] Grinding wheel fixing and grinding: The grinding wheel 9 is fixed to the outer end of the grinding head screw 8 through the locking nut 10. The rotation of the grinding head screw 8 drives the grinding wheel 9 to rotate at high speed to perform the grinding process of the internal thread.

[0065] 3. Lubrication and heat dissipation Oil injection hole lubrication: Multiple oil injection holes 11 are installed on the sleeve 1 for injecting lubricant. The lubricant is evenly distributed to various friction points inside the sleeve through the oil injection holes, including key parts such as ball bearings 12, cross needle bearings 7, straight grinding rods 4 and grinding head screws 8, reducing friction and improving the operating efficiency and life of the equipment.

[0066] Heat dissipation function: The oil filling hole 11 is not only used for lubrication, but also helps to discharge the heat generated during the grinding process. The lubricant takes away the heat during the flow process, reduces the temperature of the grinding head and the grinding rod, and avoids equipment damage caused by high temperature.

[0067] 4. Limitation and stability Limit seat fixation: A limit seat 2 is installed in the base 3, and one end of the straight grinding rod 4 extends into the limit seat 2 and is threadedly connected thereto. The limit seat 2 limits the axial movement of the straight grinding rod 4 to ensure the stability of the grinding rod during the grinding process.

[0068] 5. High-precision processing High-precision transmission: The combination of bevel gear transmission and bearing unit ensures the stability of the grinding head during high-speed rotation, reduces transmission errors and improves machining accuracy.

[0069] Angle adaptability: Bevel gear transmission can adapt to different processing angle requirements, especially when processing large-angle threads, it can effectively avoid interference problems.

[0070] 6. Maintenance and Adjustment Easy maintenance: The modular design makes the maintenance and adjustment of the grinding head and bearing unit more convenient. When the grinding wheel needs to be replaced or the grinding head position needs to be adjusted, the operation can be completed by simply removing the locking nut 10.

[0071] Convenient oil filling: The design of multiple oil filling holes 11 makes the injection of lubricant more convenient, reducing the downtime maintenance time caused by insufficient lubrication.

[0072] The small hole internal thread grinding head of the present invention realizes efficient and stable power transmission and high-precision grinding through the combination of bevel gear transmission, cross needle bearings and ball bearings. Its compact structural design and the lubrication and heat dissipation functions of multiple oil injection holes ensure the stability and long life of the equipment during high-speed grinding. This design is particularly suitable for the high-precision processing requirements of small hole internal threads, while reducing maintenance costs and improving production efficiency.

[0073] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A small hole internal thread grinding head, characterized in that: It includes a base, a sleeve, a straight grinding rod and a grinding head. The rear end of the sleeve is installed with the base, and the front end forms a bending section. A straight grinding rod is installed in the straight section of the sleeve for rotation through a bearing unit. One end of the straight grinding rod extends to the base, and the other end extends to the bending section to form a straight grinding rod bevel gear. The grinding head is installed on the bending section and is transmission-connected to the straight grinding rod.

2. A small hole internal thread grinding head according to claim 1, characterized in that: The grinding head includes a grinding wheel, a grinding head screw and a locking nut. The grinding head screw is rotatably installed on the bending section of the sleeve through a cross needle bearing. The grinding head screw is coaxially arranged with the bending section. The inner end of the grinding head screw forms a grinding head screw bevel gear, and the outer end is sequentially installed with the grinding wheel and locking nut after passing through the bending section. The grinding wheel is fixed to the grinding head screw through the locking nut; the grinding head screw bevel gear is meshed with the straight grinding rod bevel gear.

3. A small hole internal thread grinding head according to claim 1 or 2, characterized in that: A limit seat is installed in the base, and one end of the straight grinding rod extends into the limit seat and is threadedly connected with the limit seat.

4. A small hole internal thread grinding head according to claim 1, characterized in that: The bearing unit comprises a ball bearing and a cross needle bearing. The ball bearing is installed between the rear part of the straight grinding rod and the sleeve, and the cross needle bearing is installed between the front part and the sleeve.

5. A small hole internal thread grinding head according to claim 4, characterized in that: A plurality of oil filling holes are installed on the sleeve.

6. The small hole internal thread grinding head according to claim 1, characterized in that: The transmission ratio of the grinding head screw bevel gear to the straight grinding rod bevel gear is 2:1.

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