Pin hole machining method
By using customized reamers and floating tool holders in pin hole processing, combined with the steps of precise point, pre-drilling, milling and fine reaming, the problems of difficult to guarantee dimensional accuracy and surface quality in traditional methods are solved, and efficient and accurate pin hole processing is achieved.
Patent Information
- Application Number
- CN202510282409.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2025-05-13
AI Technical Summary
Traditional pin hole processing methods are difficult to ensure dimensional accuracy and surface quality, resulting in the processed holes exceeding the specified tolerance range, increasing the scrap rate and processing costs.
Final reaming is performed with custom reamers and floating handles, and the size and shape of each step is strictly controlled through precise fixed-pointing, pre-drilling, milling and fine reaming.
It effectively ensures the dimensional accuracy and surface quality of the pin holes, reduces the scrap rate and processing costs, and improves the production efficiency and product qualification rate.
Smart Images
Figure CN119973565A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of mechanical processing methods, and in particular to a pin hole processing method. Background Art
[0002] In the field of mechanical processing, the requirements for the dimensional accuracy, positional accuracy and surface quality of the locating pin hole are usually very high. These requirements are crucial to ensure that the parts can fit accurately and operate stably for a long time. In traditional processing methods, a spot drill is usually used for positioning, followed by drilling with a standard drill bit, and finally milling is used to process the hole to achieve the required size and shape. However, this method has some obvious problems and limitations.
[0003] When using standard drills and milling, it is easy to cause the processed holes to exceed the specified tolerance range due to tool wear, machine tool accuracy limitations, and operator skill differences. In addition, this method makes it difficult to ensure that the surface roughness of the holes meets high standards, especially in applications that require high-precision fit. In order to solve these problems, operators often need to try to correct the deviation by adjusting the position of the tool or using tools of different diameters, which not only reduces production efficiency, but also increases processing costs, and the pass rate is still unsatisfactory.
[0004] Generally, the size of the holes made by milling is negative tolerance and cannot meet the requirements of the drawings. Workers need to adjust the tool by adding gaskets or paper based on their experience to meet the size requirements of the holes. Such frequent adjustments waste a lot of time, and the processed size is unstable. It takes 15 minutes to process a pin hole, including the time to adjust the tool. The processed pin hole is φ11.98~φ12.10, which is difficult to meet the requirements of the drawings (φ12~φ12.018) and the surface quality of the hole is low. Summary of the invention
[0005] In view of this, the present invention aims at the deficiencies of the prior art and proposes a pin hole processing method, aiming to solve at least one of the problems raised by the above background technology.
[0006] The present invention provides a pin hole processing method, comprising the following steps:
[0007] S1, locate the pin hole position;
[0008] S2, drilling according to the position of the pin hole after positioning;
[0009] S3, milling the drilled pin hole;
[0010] S4. Ream the pin hole after milling with a reamer.
[0011] In some embodiments, step S1 includes determining the size, position, and number of the pin holes, and fixing the workpiece in which the pin holes are to be drilled.
[0012] In some embodiments, the pin hole position is located by a pilot drill.
[0013] In some embodiments, step S2 includes cleaning the workpiece where the pin hole is to be drilled, and drilling the hole with a drill bit after the pin hole is located.
[0014] In some embodiments, the workpiece in which the pin hole is to be drilled is cleaned by an air gun.
[0015] In some embodiments, the outer diameter of the drill bit is smaller than the inner diameter of the pin hole.
[0016] In some embodiments, the pin hole drilled by the drill bit is enlarged by a milling cutter.
[0017] In some embodiments, the inner diameter of the pin hole after the milling cutter expands the hole is smaller than the standard inner diameter of the pin hole, and the inner diameter of the pin hole after the milling cutter expands the hole is 0.1mm-0.2mm different from the standard inner diameter of the pin hole.
[0018] In some embodiments, the reamer is mounted on a floating handle.
[0019] In some embodiments, the reaming is performed by a floating reamer and the reamed hole is cleaned using an air gun.
[0020] Compared with the prior art, the beneficial effect of the present invention is that by using a customized reamer and a floating tool holder for final reaming, the dimensional accuracy and surface quality of the pin hole can be effectively guaranteed. This method reduces the scrap rate caused by exceeding the tolerance or the surface roughness not meeting the standard. In the traditional method, due to tool wear, machine tool precision limitations and operator skill differences, it is easy to cause the processed holes to exceed the specified tolerance range. The improved processing flow ensures that each step can strictly control the size and shape through precise positioning, pre-drilling, milling and fine reaming, thereby improving the qualified rate of the product. The improved processing flow simplifies the operating steps, and the processing time of each pin hole is shortened to 5 minutes, which greatly improves the production efficiency compared with the traditional method. This is especially important for mass production, which can significantly reduce the processing cycle and speed up the product to market. In the traditional method, the operator needs to frequently adjust the tool position or use tools of different diameters to try to correct the deviation, which not only reduces the production efficiency, but also increases the processing cost. The improved process provides a better foundation for subsequent milling and reaming through precise positioning and pre-drilling, thereby reducing adjustment time and correction work. The use of customized milling and reaming tools ensures that the machining allowance is controlled between 0.1mm-0.2mm, which not only meets the design requirements, but also ensures that the position accuracy of the pin hole is not affected by the machining process. Customized tools can be manufactured according to specific design requirements, ensuring accuracy and consistency during the machining process. In addition, the design of the floating tool holder allows the reamer to adjust adaptively within a certain range to compensate for tool wear and machine tool errors, thereby further improving the machining accuracy. The application of customized reamer on the floating tool holder makes the surface quality of the machined pin hole high without changing the original position accuracy of the hole. This is crucial for parts that require high-precision fit. High surface quality means better fit performance and longer service life, thereby improving the overall quality and reliability of the product. Due to the high machining accuracy, the need for subsequent corrections is reduced, which further reduces production costs and improves overall work efficiency. In traditional methods, due to large machining errors, multiple corrections are often required to meet the design requirements, which not only increases the workload but also may introduce new errors. The improved process reduces the need for corrections through precise machining control, thereby saving time and cost. This method is suitable for parts of various materials and complex shapes, and has strong versatility and flexibility. Whether it is carbide or soft material, simple shape or complex structure, this method can provide high-quality processing results. This wide applicability enables this method to meet the diverse needs of different industries and fields. Although a certain amount of investment may be required in the early stage for customized tools or equipment, due to the improvement of production efficiency and qualification rate, it can save a lot of costs for enterprises in the long run and improve market competitiveness.High-efficiency production means lower operating costs and faster market response, while high qualification rate means less waste and higher customer satisfaction. These factors work together to enable enterprises to occupy a favorable position in the fierce market competition.
[0021] The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure.
[0022] Other features and aspects of the present disclosure will become more apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 A flow chart of a pin hole machining method provided in an embodiment of the present invention. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0026] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0027] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0028] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0029] As mentioned in the background technology, in the field of mechanical processing, the requirements for the dimensional accuracy, positional accuracy and surface quality of the locating pin hole are usually very high. These requirements are crucial to ensure that the parts can be accurately matched and operate stably for a long time. In the traditional processing method, a spot drill is usually used for positioning, followed by drilling with a standard drill bit, and finally milling is used to process the hole to achieve the desired size and shape. However, this method has some obvious problems and limitations.
[0030] When using standard drills and milling, it is easy to cause the processed holes to exceed the specified tolerance range due to tool wear, machine tool accuracy limitations, and operator skill differences. In addition, this method makes it difficult to ensure that the surface roughness of the holes meets high standards, especially in applications that require high-precision fit. In order to solve these problems, operators often need to try to correct the deviation by adjusting the position of the tool or using tools of different diameters, which not only reduces production efficiency, but also increases processing costs, and the pass rate is still unsatisfactory.
[0031] Generally, the size of the holes made by milling is negative tolerance and cannot meet the requirements of the drawings. Workers need to adjust the tool by adding gaskets or paper based on their experience to meet the size requirements of the holes. Such frequent adjustments waste a lot of time, and the processed size is unstable. It takes 15 minutes to process a pin hole, including the time to adjust the tool. The processed pin hole is φ11.98~φ12.10, which is difficult to meet the requirements of the drawings (φ12~φ12.018) and the surface quality of the hole is low.
[0032] In order to improve the above problems, a pin hole processing method proposed in this application can effectively ensure the dimensional accuracy and surface quality of the pin hole by using a customized reamer and a floating tool holder for final reaming. This method reduces the scrap rate caused by exceeding the tolerance or substandard surface roughness. In the traditional method, due to tool wear, machine tool accuracy limitations and operator skill differences, it is easy to cause the processed holes to exceed the specified tolerance range. The improved processing flow ensures that the size and shape can be strictly controlled in each step through precise positioning, pre-drilling, milling and fine reaming, thereby improving the product qualification rate. The improved processing flow simplifies the operating steps, and the processing time of each pin hole is shortened to 5 minutes, which greatly improves the production efficiency compared with the traditional method. This is especially important for mass production, which can significantly reduce the processing cycle and speed up the product to market. In the traditional method, the operator needs to frequently adjust the tool position or use tools of different diameters to try to correct the deviation, which not only reduces the production efficiency, but also increases the processing cost. The improved process provides a better foundation for subsequent milling and reaming through precise positioning and pre-drilling, thereby reducing adjustment time and correction work. The use of customized milling and reaming tools ensures that the machining allowance is controlled between 0.1mm-0.2mm, which not only meets the design requirements, but also ensures that the position accuracy of the pin hole is not affected by the machining process. Customized tools can be manufactured according to specific design requirements, ensuring accuracy and consistency during the machining process. In addition, the design of the floating tool holder allows the reamer to be adaptively adjusted within a certain range to compensate for tool wear and machine tool errors, thereby further improving the machining accuracy. The application of customized reamer on the floating tool holder makes the surface quality of the machined pin hole higher without changing the original position accuracy of the hole. This is crucial for parts that require high-precision fit. High surface quality means better fit performance and longer service life, thereby improving the overall quality and reliability of the product. Due to the high machining accuracy, the need for subsequent corrections is reduced, which further reduces production costs and improves overall work efficiency. In traditional methods, due to large machining errors, multiple corrections are often required to meet design requirements, which not only increases the workload but also may introduce new errors. The improved process reduces the need for corrections through precise processing control, thus saving time and costs. This method is applicable to parts of various materials and complex shapes, and has strong versatility and flexibility. Whether it is carbide or soft materials, whether it is simple shapes or complex structures, this method can provide high-quality processing results. This wide applicability enables this method to meet the diverse needs of different industries and fields. Although a certain amount of investment may be required in the early stage for customized tools and equipment, due to the improvement of production efficiency and qualification rate, it can save a lot of costs for enterprises in the long run and improve market competitiveness.High-efficiency production means lower operating costs and faster market response, while high qualification rate means less waste and higher customer satisfaction. These factors work together to enable enterprises to occupy a favorable position in the fierce market competition.
[0033] See also Figure 1 As shown, a pin hole processing method according to an embodiment of the present application includes the following steps:
[0034] S1, locate the pin hole position;
[0035] S2, drilling according to the position of the pin hole after positioning;
[0036] S3, milling the drilled pin hole;
[0037] S4. Ream the pin hole after milling with a reamer.
[0038] Specifically, first, the pin hole is precisely located using a center drill. This step is the basis of the entire processing flow and ensures the accuracy and consistency of subsequent processing. Through precise positioning, position deviation can be avoided in the subsequent processing, thereby improving the qualified rate of the product. According to the position of the pin hole after positioning, a small diameter drill is used for pre-drilling. This step provides a good foundation for subsequent milling and reaming, while also reducing material waste. The use of a small diameter drill helps to improve processing efficiency because it can quickly penetrate the material and reduce processing time. The pre-drilled pin hole is milled to expand the hole diameter and improve the surface quality. Milling can not only improve the shape accuracy of the hole, but also improve the surface roughness of the hole wall, preparing for the final hole expansion. In addition, milling can also remove burrs and irregular edges that may be generated during the drilling process. Finally, a customized reamer is used to ream the pin hole after milling. The reamer is mounted on a floating tool holder, which can adaptively adjust to compensate for tool wear and machine tool errors without changing the pin hole position. This step is a key link in the entire processing flow, which directly affects the dimensional accuracy and surface quality of the pin hole. By using customized reamers and floating tool holders, the processing accuracy and efficiency can be greatly improved, while ensuring the consistency and reliability of the product. The pin hole processing method of this application achieves efficient and high-precision pin hole processing through four steps of precise positioning, pre-drilling, milling and reaming. This method not only improves production efficiency and product qualification rate, but also ensures the position accuracy and surface quality of the pin hole, meeting the design requirements.
[0039] In some specific embodiments, step S1 includes determining the size, position, and number of the pin holes, and fixing the workpiece in which the pin holes are to be drilled.
[0040] Specifically, by accurately determining the size, position and number of pin holes, it is possible to ensure that each pin hole meets the design requirements, thereby improving the processing accuracy. This helps to reduce the scrap rate caused by size deviation or position error and improve the product qualification rate. The correct size and position of the pin hole are crucial to ensure the function and performance of the product. For example, in mechanical assembly, the position accuracy of the pin hole directly affects the fit and motion accuracy of the parts. Therefore, by accurately controlling the size and position of the pin hole, the quality of the final product can be guaranteed. Fixing the workpiece where the pin hole is required to be drilled before starting processing can reduce the adjustment time during the processing and improve production efficiency. The fixed workpiece can be quickly batch processed without frequent repositioning and clamping, thus saving a lot of production time. By predetermining the size, position and number of pin holes, the possibility of operator errors during processing can be reduced. Clear guidance and standardized operating procedures help reduce human errors and improve the consistency and reliability of processing. Fixed workpieces and clear processing parameters make quality control easier. The processing quality can be evaluated by checking whether the processed pin holes meet the predetermined size and position requirements, so that the processing strategy can be adjusted in time to maintain high quality standards. Fixing the workpiece before machining can improve work safety. The fixed workpiece reduces accidental movement or vibration during machining, reduces the risk of operator injury, and protects the equipment from damage. This method is suitable for parts of various materials and complex shapes, with strong versatility and flexibility. Whether it is carbide or soft material, whether it is simple shape or complex structure, this method can provide high-quality machining results.
[0041] In some specific embodiments, the pin hole position is located by a pilot drill.
[0042] Specifically, using a spot drill to locate the pin hole position can significantly improve machining accuracy. This is because the spot drill can ensure that the center of the pin hole is accurately aligned with the predetermined position, thereby avoiding position deviations during subsequent machining. This high-precision positioning is the basis for achieving high-quality machining, helping to reduce dimensional errors and shape errors and improve product consistency and reliability. The correct pin hole position is essential to ensuring the function and performance of the product. For example, in mechanical assembly, the position accuracy of the pin hole directly affects the fit and motion accuracy of the parts. Therefore, by accurately locating the pin hole through a spot drill, the quality of the final product can be guaranteed to meet design requirements and customer expectations. Using a spot drill to locate the pin hole position before starting machining can reduce adjustment time during machining and improve production efficiency. Fixed workpieces can be quickly processed in batches without frequent repositioning and clamping, saving a lot of production time. In addition, rework and scrap caused by position errors are reduced, further improving production efficiency. By predetermining the position of the pin hole and using a spot drill for positioning, the possibility of operator errors during machining can be reduced. Clear guidance and standardized operating procedures help reduce human errors and improve machining consistency and reliability. This helps reduce scrap and rework caused by operating errors, lowering production costs.
[0043] In some specific embodiments, step S2 includes cleaning the workpiece in which the pin hole is to be drilled, and drilling the hole with a drill bit after the pin hole is located.
[0044] In some specific embodiments, the workpiece in which the pin hole is to be drilled is cleaned by an air gun.
[0045] Specifically, cleaning the workpiece before drilling can remove impurities and oil stains on the surface, which helps ensure that the drill bit is in closer contact with the workpiece surface, thereby improving the accuracy of the drilling. The cleaned surface reduces the possibility of the drill bit slipping, making the drilled pin hole more accurate and meeting the design requirements. A cleaned workpiece surface helps improve the quality of the drilling. Without the interference of impurities and oil stains, the drilled pin hole will be smoother and the edges will be neater, which is crucial for subsequent assembly and use. High-quality drilling can improve the overall performance and reliability of the product. A cleaned workpiece surface can reduce the wear of the drill bit during the processing. Impurities and oil stains may accelerate the wear of the drill bit and cause it to fail prematurely. By keeping the workpiece clean, the service life of the drill bit can be extended and the replacement frequency can be reduced, thereby reducing production costs. Step S2 includes cleaning the workpiece where the pin hole is to be drilled, drilling the pin hole by a drill bit after positioning the pin hole, and cleaning the workpiece where the pin hole is to be drilled by an air gun, which has significant benefits in improving processing accuracy, ensuring product quality, extending tool life, improving production efficiency, reducing operating errors, facilitating quality control, enhancing safety, strong adaptability, and significant economic benefits. These benefits work together to bring higher production efficiency, better product quality, and stronger market competitiveness to manufacturing companies.
[0046] In some specific embodiments, the outer diameter of the drill bit is smaller than the inner diameter of the pin hole.
[0047] In some specific embodiments, the pin hole drilled by the drill bit is enlarged by a milling cutter.
[0048] In some specific embodiments, the inner diameter of the pin hole after the milling cutter is enlarged is smaller than the standard inner diameter of the pin hole, and the inner diameter of the pin hole after the milling cutter is enlarged is 0.1 mm-0.2 mm different from the standard inner diameter of the pin hole.
[0049] Specifically, the method of using a drill with an outer diameter smaller than the inner diameter of the pin hole can ensure that there is enough material removal during the drilling process, thereby achieving higher processing accuracy. This method can avoid material extrusion and deformation caused by an oversized drill bit, making the drilled pin hole more accurate and meeting the design requirements. By controlling the difference between the inner diameter of the pin hole after the milling cutter is expanded and the standard inner diameter to be between 0.1mm-0.2mm, the processing process can be further refined and the dimensional accuracy of the pin hole can be improved. Accurate pin hole size is essential to ensure the function and performance of the product. For example, in mechanical assembly, the dimensional accuracy of the pin hole directly affects the fit and motion accuracy of the parts. By controlling the machining allowance of the pin hole to be between 0.1mm-0.2mm, it can be ensured that the quality and performance of the product meet the expected standards. Using a smaller drill bit can reduce the wear of the drill bit during the processing process. A larger drill bit may cause greater cutting force and heat generation, thereby accelerating the wear of the drill bit. By reducing the wear of the drill bit, its service life can be extended, the replacement frequency can be reduced, and the production cost can be reduced. A smaller drill bit can complete the drilling task in a shorter time, thereby improving production efficiency. In addition, since the amount of material removed is reduced, the time required for subsequent processing steps is also reduced. Production efficiency can be further improved by optimizing processing parameters such as feed speed and rotation speed. Smaller drills and precise dimensional control help reduce the possibility of operator errors during processing. Clear instructions and standardized operating procedures help reduce human errors and improve the consistency and reliability of processing. This helps to reduce scrap and rework caused by operator errors and reduce production costs. Fixed workpieces and clear processing parameters make quality control easier. The processing quality can be evaluated by checking whether the processed pin holes meet the predetermined position and size requirements, so that the processing strategy can be adjusted in time to maintain high quality standards. This helps to ensure that each pin hole meets the design requirements and improves the qualified rate of the product. Cleaning the workpiece before processing can improve work safety. A clean working environment reduces the risk of operator injury and also protects the equipment from damage. This helps to create a safer working environment and reduce the occurrence of work-related accidents.
[0050] In some embodiments, the reamer is mounted on a floating handle.
[0051] Specifically, the reamer mounted on a floating shank can automatically adjust the position of the tool to adapt to slight changes in the workpiece surface. This automatic adjustment capability ensures that the tool always maintains optimal contact with the workpiece surface, thereby improving the accuracy of the processing. Since the tool can be fine-tuned according to the actual shape of the workpiece, the processing error caused by inaccurate tool positioning can be reduced, making the final product more in line with the design specifications. Accurate processing is directly related to the quality of the product. Using a floating shank can ensure that the reamer always maintains the optimal cutting angle and depth during the processing process, thereby obtaining a high-quality processing surface. This high-quality processing surface not only improves the appearance quality of the product, but also enhances the performance and durability of the product. The floating shank can reduce the wear of the tool during the processing process. Since the tool can automatically adjust its position to adapt to slight changes in the workpiece surface, the friction and impact between the tool and the workpiece are reduced. This reduced wear helps to extend the service life of the tool, reduce the frequency of replacement, and reduce production costs.
[0052] In some specific embodiments, the reaming is performed by a floating reamer, and the reamed hole is cleaned using an air gun.
[0053] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A pin hole processing method, characterized in that: The following steps are involved: S1, locate the pin hole position; S2, drilling according to the position of the pin hole after positioning; S3, milling the drilled pin hole; S4. Ream the pin hole after milling with a reamer.
2. A pin hole processing method according to claim 1, characterized in that: The step S1 includes determining the size, position and quantity of the pin holes, and fixing the workpiece on which the pin holes are to be drilled.
3. A pin hole processing method according to claim 2, characterized in that: The pin hole position is located by a pilot drill.
4. A pin hole processing method according to claim 1, characterized in that: The step S2 includes cleaning the workpiece where the pin hole is to be drilled, and drilling the pin hole by means of a drill bit after the pin hole is positioned.
5. A pin hole processing method according to claim 4, characterized in that: Use an air gun to clean the workpiece where the pin hole is to be drilled.
6. A pin hole processing method according to claim 4, characterized in that: The outer diameter of the drill bit is smaller than the inner diameter of the pin hole.
7. A pin hole processing method according to claim 1, characterized in that: The pin hole drilled by the drill bit is enlarged by a milling cutter.
8. A pin hole processing method according to claim 7, characterized in that: The inner diameter of the pin hole after the milling cutter is enlarged is smaller than the standard inner diameter of the pin hole, and the inner diameter of the pin hole after the milling cutter is enlarged is 0.1mm-0.2mm different from the standard inner diameter of the pin hole.
9. A pin hole processing method according to claim 1, characterized in that: The reamer is mounted on a floating handle.
10. A pin hole processing method according to claim 9, characterized in that: The holes are reamed using a floating reamer and cleaned using an air gun.