Small hole internal thread grinding head

Abstract

The utility model 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 utility model has the advantages that the speed of the grinding head can be improved by adopting the integrated sleeve for processing, and the oil injection port is additionally arranged outside the sleeve, so that the heat dissipation can be increased in the grinding process, and the higher grinding speed can be met.

Description

Technical Field

[0001] This utility model relates to a small-hole internal thread grinding head, belonging to the field of grinding. Background Technology

[0002] In the field of modern machining, internal thread grinding is a common machining process, especially important for machining small holes with high precision and complex shapes. However, existing grinding head devices for internal thread grinding have significant technical limitations, particularly in high-speed and high-precision machining scenarios, where their performance and reliability are difficult to meet practical requirements.

[0003] In existing technologies, internal thread grinding heads typically employ a split wire connection method, fixing the grinding rod and grinding head within a sleeve. While this design can meet certain machining requirements at low speeds, it exposes numerous problems at high speeds. First, the mechanical strength of the wire connection is relatively low, unable to withstand the centrifugal force and cutting force generated by high-speed rotation. When the speed exceeds a certain threshold, the wire will gradually lose its elasticity due to thermal expansion, potentially leading to breakage. Such breakage not only damages the machining equipment but also poses a safety hazard to operators.

[0004] Secondly, the thermal expansion effect of the wire connection directly affects machining accuracy. During high-speed grinding, the thermal expansion of the wire can cause the grinding head to shift position, thus affecting the machining accuracy of the threads. Furthermore, insufficient rigidity of the wire connection makes the grinding head prone to vibration during processing, further reducing machining quality.

[0005] Furthermore, the existing split-wire connection method limits the improvement of grinding speed. Because the wire connection cannot withstand high rotational speeds, the grinding speed is forced to decrease, resulting in a significant increase in processing time. This extended processing time not only reduces production efficiency but also increases processing costs, especially in mass production, where the cumulative effect of these costs is particularly pronounced.

[0006] Furthermore, the insufficient heat dissipation performance of existing technologies is also a significant issue. During high-speed grinding, a large amount of heat is generated in the grinding area, but the heat dissipation capacity of the wire connection is poor, failing to effectively reduce the temperature of the grinding head and grinding rod. Excessive temperature not only accelerates the aging and breakage of the wire but also leads to increased wear of the grinding wheel, further affecting machining accuracy and equipment lifespan.

[0007] In summary, existing internal thread grinding head devices have significant limitations in high-speed, high-precision machining scenarios, including insufficient mechanical strength, significant thermal expansion effects, limited grinding speed, and poor heat dissipation. These problems not only restrict the improvement of machining efficiency but also increase machining costs and equipment maintenance difficulty. Therefore, developing an internal thread grinding device that can meet the requirements of high-speed, high-precision machining is a pressing technical challenge in the field of machining. Utility Model Content

[0008] To overcome the shortcomings of existing technologies, this utility model provides a small-hole internal thread grinding head. The technical solution of this utility model is as follows:

[0009] A small-hole internal thread grinding head includes a base, a sleeve, a straight grinding rod, and a grinding head. The base is installed at the rear end of the sleeve, and a bent section is formed at the front end. The straight grinding rod is rotatably installed inside the straight section of the sleeve via a bearing unit. One end of the straight grinding rod extends to the base, and the other end extends to the bent section to form a straight grinding rod bevel gear. The grinding head is installed on the bent section, and the grinding head is drivenly connected to the straight grinding rod.

[0010] The grinding head includes a grinding wheel, a grinding head screw, and a locking nut. The grinding head screw is rotatably mounted on the bent section of the sleeve via a crossed needle roller bearing. The grinding head screw is coaxially arranged with the bent section. The inner end of the grinding head screw forms a grinding head screw bevel gear, and the outer end extends out of the bent section and is sequentially fitted with the grinding wheel and the locking nut. The grinding wheel is fixed to the grinding head screw by the locking nut. The grinding head screw bevel gear meshes with the straight grinding rod bevel gear.

[0011] A limiting seat is installed inside the base, and one end of the straight grinding rod extends into the limiting seat and is threadedly connected to the limiting seat.

[0012] The bearing unit includes ball bearings and crossed needle roller bearings. The ball bearings are installed between the rear part of the straight grinding rod and the sleeve, and the crossed needle roller bearings are installed between the front part of the straight grinding rod and the sleeve.

[0013] Several oil injection holes are installed on the sleeve.

[0014] The transmission ratio between the grinding head screw bevel gear and the straight grinding rod bevel gear is 2:1.

[0015] The advantages of this utility model are:

[0016] (1) The use of an integrated sleeve machining allows for an increase in the grinding head speed, and the addition of an oil inlet on the outside of the sleeve increases heat dissipation during grinding, thus enabling faster grinding speeds.

[0017] (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 improving the grinding rate and reducing the processing cost.

[0018] (3) Crossed needle roller bearings are used to fix the grinding head and the straight grinding rod, which makes the positioning and movement more accurate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0020] Figure 2 yes Figure 1 The left view.

[0021] Figure 3 yes Figure 1 A sectional view. Detailed Implementation

[0022] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result of the description. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solution of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0023] See Figures 1 to 3 This utility model relates to a small-hole internal thread grinding head, including a base 3, a sleeve 1, a straight grinding rod 4, and a grinding head. The base 3 is installed at the rear end of the sleeve 1, and a bent section is formed at the front end. The 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 bent section to form a straight grinding rod bevel gear 5. The grinding head is installed on the bent section, and the grinding head is connected to the straight grinding rod 4 in a transmission connection.

[0024] Based on the above structural design, the following advantages are achieved:

[0025] 1. Compact structure and highly adaptable

[0026] The bending section design of the sleeve: The bending section at the front end of the sleeve allows the grinding head to flexibly adapt to the machining requirements of small hole internal threads. Especially when space is limited, the bending section can more easily enter the small hole, improving the accessibility of machining.

[0027] The combination of the bending section and the grinding head: The grinding head is mounted on the bending section. This design not only saves space, but also ensures the fit between the grinding head and the processing surface, avoiding interference problems.

[0028] 2. High-precision transmission

[0029] Bevel gear drive: The bevel gear at the end of the straight grinding rod is connected to the grinding head via a bevel gear drive. This design enables 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.

[0030] High transmission efficiency: Bevel gear transmission can effectively reduce energy loss, ensure the stability of the grinding head when rotating at high speed, and avoid the decrease in machining accuracy caused by transmission errors.

[0031] 3. Stability and mechanical strength

[0032] Bearing unit support: The straight grinding rod is mounted inside the straight section of the sleeve via a bearing unit. This design effectively reduces friction and improves the rotational stability of the grinding rod. The bearing unit can withstand radial and axial forces, ensuring the rigidity and accuracy of the grinding rod during high-speed rotation.

[0033] Coaxial design: The straight grinding rod and the straight section of the sleeve are coaxially set. This design can reduce the influence of eccentric force and avoid vibration of the grinding rod when rotating, thereby improving the processing quality.

[0034] 4. High-efficiency heat dissipation and long lifespan

[0035] Low-friction design of bearing unit: The low-friction characteristics of bearing unit can reduce heat generation and extend the service life of grinding rod and grinding head.

[0036] Structural optimization: The coaxial design of the bent section of the sleeve and the straight grinding rod can reduce unnecessary energy loss and further reduce the heat generation of the equipment.

[0037] 5. Adaptable to complex processing requirements

[0038] The flexibility of the bending section and the grinding head: The design of the bending section allows the grinding head to adapt to the complex geometry of small-hole internal threads, especially when machining large-angle threads, which can effectively avoid interference problems.

[0039] High-precision machining capability: The combination of bevel gear drive and bearing unit ensures the stability of the grinding head when rotating at high speed, thus meeting the requirements of high-precision machining.

[0040] 6. High space utilization

[0041] The sleeve combines a straight section with a bent section: 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 within a limited space.

[0042] This small-hole internal thread grinding head design, through the combination of a bending section, bevel gear drive, bearing unit, and modular structure, not only improves machining accuracy and efficiency but also enhances the stability and adaptability of the equipment. Its compact structure and flexible machining capabilities make it particularly suitable for the high-precision machining needs of small-hole internal threads, while reducing maintenance costs and extending the equipment's service life.

[0043] 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 mounted on the bent section of the sleeve 1 via a crossed needle roller bearing 7. The grinding head screw 8 is coaxially arranged with the bent 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 bent section and is sequentially mounted with the grinding wheel 9 and the locking nut 10. The grinding wheel 9 is fixed to the grinding head screw 8 by the locking nut 10. The grinding head screw bevel gear 6 meshes with the straight grinding rod bevel gear 5.

[0044] This grinding head design incorporates several innovative structures and has the following advantages:

[0045] 1. High-precision rotation and stability

[0046] Crossed needle roller bearing installation: The grinding head screw is installed on the bent section of the sleeve via a crossed 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.

[0047] Coaxial configuration: The grinding head screw and the bending section are coaxially configured, which reduces the influence of eccentric force and avoids vibration during rotation, thereby improving the processing quality.

[0048] 2. High-efficiency transmission and flexibility

[0049] Bevel gear drive: The bevel gear of the grinding head screw meshes with the bevel gear of the straight grinding rod. This bevel gear drive 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 requirements of small hole internal threads.

[0050] Transmission ratio optimization: The transmission ratio of bevel gears can be optimized according to actual processing requirements to further improve grinding efficiency and accuracy.

[0051] 3. Stability and ease of replacement of the grinding wheel

[0052] Grinding wheel locking design: The grinding wheel is fixed to the outer end of the grinding head screw by a locking nut. This design ensures the stability of the grinding wheel when rotating at high speed, and at the same time facilitates quick replacement of grinding wheels of different specifications to meet different processing needs.

[0053] 4. Compact structure and strong adaptability

[0054] 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 machining requirements.

[0055] High space utilization: The compact layout of the grinding head screw and grinding wheel achieves efficient functional integration within a limited space, improving the overall performance of the equipment.

[0056] 5. High-speed grinding capability

[0057] High rigidity design: The combination of crossed needle roller bearings and coaxial arrangement improves the mechanical strength of the grinding head, enabling it to withstand higher rotational speeds and thus achieve faster grinding rates.

[0058] Heat dissipation performance: The structural design takes into account heat dissipation requirements, reduces the impact of high temperature on the grinding head and grinding wheel, and extends the service life of the equipment.

[0059] 6. Precise force transmission and machining accuracy

[0060] Precise meshing of bevel gears: The precise meshing of the bevel gear on the grinding head screw and the bevel gear on the straight grinding rod ensures efficient force transmission, reduces transmission errors, and thus improves machining accuracy.

[0061] Angle adaptability: Bevel gear transmissions can adapt to different machining angle requirements, especially when machining large-angle threads, and can effectively avoid interference problems.

[0062] This grinding head design, through the combination of crossed needle roller bearings, bevel gear drive, coaxial configuration, and modular structure, not only improves the rotational accuracy and stability of the grinding head but also enhances its high-speed grinding capability and adaptability. Its compact structure and flexible machining capabilities make it particularly suitable for the high-precision machining requirements of small-hole internal threads, while reducing maintenance costs and extending equipment lifespan.

[0063] A limiting seat 2 is installed inside the base 3, and one end of the straight grinding rod 4 extends into the limiting seat 2 and is threadedly connected to the limiting seat 2.

[0064] The bearing unit includes a ball bearing 12 and a crossed needle roller bearing 7. The ball bearing 12 is installed between the rear part of the straight grinding rod and the sleeve 1, and the crossed needle roller bearing 7 is installed between the front part of the straight grinding rod and the sleeve.

[0065] This bearing unit structure combines the advantages of ball bearings and crossed needle roller bearings, and has the following advantages:

[0066] 1. High precision and stability

[0067] Applications of crossed needle roller bearings: Crossed needle roller bearings are installed between the front of the straight grinding rod and the sleeve, capable of withstanding large radial and axial loads, ensuring the stability of the grinding head during high-speed rotation. This bearing design reduces vibration during rotation and improves machining accuracy.

[0068] Application of ball bearings: The ball bearings are installed between the rear of the straight grinding rod and the sleeve, providing low-friction rotational support and ensuring the smoothness of the straight grinding rod when rotating at high speed.

[0069] 2. High-speed rotation capability

[0070] Low-friction design: The combination of ball bearings and crossed needle roller bearings reduces friction between the straight grinding rod and the sleeve, allowing the grinding head to operate at higher speeds, thereby improving grinding efficiency.

[0071] Heat dissipation performance: The bearing unit is designed with heat dissipation requirements in mind, reducing the impact of high temperatures on the bearings and grinding heads and extending the service life of the equipment.

[0072] 3. Compact structure and strong adaptability

[0073] Space optimization: The combination design of ball bearings and crossed needle roller bearings achieves efficient functional integration within a limited space, improving the overall performance of the equipment.

[0074] Flexibility: This structural design allows the grinding head to adapt to the machining needs of small-diameter internal threads, especially in situations where space is limited.

[0075] 4. High load capacity

[0076] High load-bearing capacity 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 by overload during processing.

[0077] Additional support from ball bearings: Ball bearings provide additional support, enhancing the mechanical strength of the entire structure.

[0078] 5. Heat dissipation and lubrication

[0079] Integrated oil inlet: An oil inlet is provided on the outside of the sleeve to provide lubrication and heat dissipation for the bearing unit during grinding, further improving the reliability and service life of the equipment.

[0080] The bearing unit structure, through the combination of ball bearings and crossed needle roller bearings, not only improves the rotational accuracy and stability of the grinding head but also enhances its high-speed grinding capability and adaptability. Its compact structure and flexible machining capabilities make it particularly suitable for the high-precision machining requirements of small-hole internal threads, while reducing maintenance costs and extending the equipment's service life.

[0081] Several oil injection holes 11 are installed on the sleeve 1. Multiple oil injection holes ensure that lubricant is evenly distributed to all friction points inside the sleeve, including critical components such as bearings, grinding rods, and grinding heads. This design effectively reduces friction and extends the service life of the equipment. The oil injection holes not only inject lubricant but also help dissipate heat during grinding. The lubricant carries away heat as it flows, thereby reducing the temperature of the grinding head and grinding rod, and preventing equipment damage due to high temperatures.

[0082] The transmission ratio between the grinding head screw bevel gear 6 and the straight grinding rod bevel gear 5 is 2:1.

[0083] The working principle of this utility model is as follows:

[0084] 1. Power transmission and rotation

[0085] Power source: The power source (such as an electric motor) transmits 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 is supported by the bearing unit (ball bearing 12 and crossed needle roller bearing 7) to ensure its stability and accuracy during high-speed rotation.

[0086] Bevel gear drive: 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. This transmission ratio can optimize the rotational speed and torque of the grinding head, ensuring efficient and stable force transmission.

[0087] 2. Grinding head rotation and grinding

[0088] Grinding head rotation: The grinding head screw 8 is mounted on the bent section of the sleeve 1 via a crossed needle roller bearing 7 and is connected to the grinding head screw bevel gear 6. When the straight grinding rod 4 rotates, power is transmitted to the grinding head screw 8 through the bevel gear transmission, causing it to rotate at high speed.

[0089] Grinding wheel fixing and grinding: The grinding wheel 9 is fixed to the outer end of the grinding head screw 8 by the locking nut 10. The rotation of the grinding head screw 8 drives the grinding wheel 9 to rotate at high speed to perform internal thread grinding.

[0090] 3. Lubrication and heat dissipation

[0091] Lubrication via oil injection holes: 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, crossed needle roller bearings 7, straight grinding rods 4, and grinding head screws 8, reducing friction and improving the operating efficiency and lifespan of the equipment.

[0092] Heat dissipation function: The oil injection hole 11 is not only used for lubrication, but also helps to dissipate the heat generated during grinding. The lubricant carries away heat during its flow, reducing the temperature of the grinding head and grinding rod, and preventing equipment damage caused by high temperature.

[0093] 4. Limits and Stability

[0094] Limit seat fixing: A limit seat 2 is installed inside the base 3, and one end of the straight grinding rod 4 extends into the limit seat 2 and is threadedly connected to it. The limit seat 2 restricts the axial movement of the straight grinding rod 4, ensuring the stability of the grinding rod during the grinding process.

[0095] 5. High-precision machining

[0096] High-precision transmission: The combination of bevel gear transmission and bearing unit ensures the stability of the grinding head when it rotates at high speed, reduces transmission error, and improves machining accuracy.

[0097] Angle adaptability: Bevel gear transmissions can adapt to different machining angle requirements, especially when machining large-angle threads, and can effectively avoid interference problems.

[0098] 6. Maintenance and Adjustment

[0099] Easy to maintain: The modular design makes maintenance and adjustment of the grinding head and bearing unit more convenient. When it is necessary to change the grinding wheel or adjust the position of the grinding head, simply remove the lock nut 10 to complete the operation.

[0100] Easy lubrication: The design of multiple lubrication holes 11 makes it easier to inject lubricant, reducing downtime for maintenance due to insufficient lubrication.

[0101] This utility model's small-hole internal thread grinding head achieves efficient and stable power transmission and high-precision grinding through a combination of bevel gear transmission, crossed needle roller bearings, and ball bearings. Its compact structural design and multiple oil injection holes for lubrication and heat dissipation ensure the stability and long service life of the equipment during high-speed grinding. This design is particularly suitable for the high-precision machining requirements of small-hole internal threads, while reducing maintenance costs and improving production efficiency.

[0102] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tap for internal threads, characterized in that 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, the other end extends to the rear of the bent section to form a straight grinding rod bevel gear, the grinding head is installed on the bent section and is in driving connection with the straight grinding rod.

2. A small hole internal thread grinding head according to claim 1, characterized in that, The grinding head comprises a grinding wheel, a grinding head screw rod and a locking nut, the grinding head screw rod is rotatably installed in the bent section of the sleeve through a cross roller bearing, the grinding head screw rod is coaxially arranged with the bent section, the inner end of the grinding head screw rod forms a grinding head screw rod bevel gear, the outer end of the grinding head screw rod extends out of the bent section and is sequentially provided with the grinding wheel and the locking nut, the grinding wheel is fixed on the grinding head screw rod through the locking nut; the grinding head screw rod bevel gear is in mesh 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 limiting seat is installed in the base, one end of the straight grinding rod extends into the limiting seat and is in threaded connection with the limiting seat.

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

5. A small hole internal thread grinding head according to claim 4, wherein A plurality of oil injection holes are installed on the sleeve.

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

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