A special-shaped pipe inner circle polishing machine and method

Abstract

A grinding machine for the inner circle of irregularly shaped tubes includes a slide table motion mechanism, a fixed headstock motion mechanism, a grinding spindle motion mechanism, a grinding feed motion mechanism, lifting and translating rollers, and a center chuck mechanism. The slide table motion mechanism includes a slide table, a drive motor, and a base. The slide table is mounted on the base via a guide rail, and the drive motor is mounted on the base and connected to the slide table for transmission. It drives the slide table to reciprocate linearly along the guide rail in the length direction of the base, achieving axial feed motion of the workpiece. This invention enables auxiliary feeding of long and short tubes in high-purity quartz irregularly shaped tubes, flexible clamping and rotation at both ends, and automatic inner circle grinding. It solves a series of problems existing in high-purity quartz irregularly shaped tubes, such as concentricity deviation between the inner and outer circles, a certain degree of curvature in the inner circle, irregular shape of the outer circle, and a certain depth of impurities on the inner circle surface. This reduces the intensity of traditional manual grinding and improves production efficiency.

Description

Technical Field

[0001] This invention relates to the field of high-purity quartz tube manufacturing technology in specific industries such as semiconductors and optics, and in particular to an inner grinding machine for irregularly shaped tubes, and a method for grinding the inner circle of irregularly shaped tubes. Background Technology

[0002] After high-purity quartz shaped tubular fittings are drawn and formed in a high-temperature furnace, impurities exist on the inner surface of the fittings, and the dimensional and positional tolerances are large. The cylindricity of the inner circle requires further grinding to meet processing requirements. This is mainly manifested in the following ways: 1. There is a deviation in the concentricity between the inner and outer circles. After the workpiece is rotated, the axis of the inner circle will run out, which will affect the linear feed of the grinding head. 2. The inner circle has a certain degree of curvature, which affects the straight-line feed of the grinding head; 3. The outer circle shape is irregular, making it impossible to effectively clamp and ensure that the chuck axis coincides with the workpiece axis; 4. Impurities of a certain depth exist on the inner surface, requiring workers to identify, confirm, and remove them. 5. Quartz tubes are made of hard and brittle materials. For tubes of different lengths, both ends must be clamped and fixed. Cantilever installation and cantilever processing are not allowed. 6. Due to the long length and irregular shape of the workpiece, existing machine tools on the market cannot effectively process it. Currently, manual grinding is used, but the production efficiency and processing quality are both low, which cannot meet the normal production needs of the workshop. Summary of the Invention

[0003] The technical problem to be solved by this invention is to address the shortcomings of existing technologies by providing an inner grinding machine for irregularly shaped tubes. This machine can perform functions such as auxiliary feeding of long and short tubes in high-purity quartz irregularly shaped tubes, flexible clamping and rotation at both ends, and automatic grinding of the inner circle. This solves a series of problems existing in high-purity quartz irregularly shaped tubes, such as deviations in the concentricity of the inner and outer circles, a certain degree of curvature of the inner circle, irregular shape of the outer circle, and a certain depth of impurities on the inner circle surface. It reduces the intensity of traditional manual grinding and improves production efficiency, automation level, workpiece dimensional accuracy, and workpiece surface quality.

[0004] Another technical problem to be solved by the present invention is to provide a grinding method for the inner circle grinding machine of the above-mentioned irregular pipe fittings.

[0005] The technical problem to be solved by the present invention is achieved through the following technical solution. The present invention is an internal grinding machine for irregularly shaped pipe fittings, including a slide table motion mechanism, a fixed headstock motion mechanism, a grinding spindle motion mechanism, a grinding feed motion mechanism, lifting and translating support rollers, and a center support chuck mechanism; The slide table motion mechanism includes a slide table, a drive motor, and a base. The slide table is mounted on the base via a guide rail. The drive motor is mounted on the base and is connected to the slide table for transmission. It is used to drive the slide table to reciprocate linearly along the guide rail in the length direction of the base to realize the axial feeding motion of the workpiece. The fixed headstock motion mechanism includes a drive motor, a fixed base, a separable headstock chuck mechanism, and a fixed headstock drive mechanism. The separable headstock chuck mechanism is connected to the fixed headstock drive mechanism, and the separable headstock chuck mechanism is connected to a linear guide rail set on a slide table via a slider. The fixed headstock drive mechanism is connected to the fixed base, and the fixed base is connected to the base. The drive motor is connected to the fixed headstock drive mechanism for transmission, which is used to realize the workpiece drive rotation. The grinding spindle motion mechanism includes a grinding spindle, a drive motor, and a base. A grinding wheel and a circulating coolant circuit are installed at the end of the grinding spindle. Both the grinding spindle and the drive motor are mounted on the base, which is slidably mounted on the base. The grinding spindle is connected to the drive motor via a transmission. The grinding feed motion mechanism includes a drive motor with handwheel adjustment and a base. The bases are connected to each other, and the drive motor with handwheel adjustment is connected to the base for transmission. It is used to drive the base to drive the grinding spindle motion mechanism to perform cutting feed motion in the workpiece radius direction. The lifting and translating rollers are used to provide auxiliary support, manual lifting and translating of the workpiece after it is loaded, and to assist the workpiece in chuck centering, so as to facilitate precise clamping of the chuck and prevent damage to the workpiece surface from collision. The chuck mechanism obtains power from the fixed headstock drive mechanism through a synchronous transmission shaft to drive the workpiece to rotate, while simultaneously operating automatically or manually on the linear guide rail.

[0006] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: For the above-mentioned inner circle grinding machine for irregular pipe fittings, the separable headstock chuck mechanism includes a base, a slider, a locking cylinder, a separable connecting shaft, a flat key, a chuck, a jaw, a jaw sleeve and an extended jaw sleeve assembly. The base is connected to the linear guide rail set on the slide table through the slider, so as to realize the free sliding of the separable headstock chuck mechanism on the slide table by manual operation. The locking cylinder is mounted on the base and is used to automatically lock and position the separable headstock chuck mechanism after it has moved. The separable connecting shaft is connected to the base via a bearing, and a flat key is connected to the separable connecting shaft. When switching between processing irregular short tubes and irregular long tubes, the separable headstock chuck mechanism and the fixed headstock drive mechanism can be manually separated or connected via the separable connecting shaft and the flat key. The chuck is connected to the base via a detachable connecting shaft, and the surface of the chuck's jaws is covered with a flexible material to prevent damage to the workpiece.

[0007] The technical problem to be solved by the present invention can also be further achieved through the following technical solution: For the above-mentioned irregular pipe inner circle grinding machine, the chuck jaws are also equipped with several sets of extended jaw sleeve assemblies for assisting in feeding and carrying the workpiece.

[0008] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: For the above-mentioned inner circle grinding machine for irregular pipe fittings, when processing short pipes, the separable head frame chuck mechanism is in a disengaged state from the fixed head frame drive mechanism. At this time, the separable head frame chuck mechanism slides automatically on the linear guide rail, serving as a passive chuck without power.

[0009] The technical problem to be solved by the present invention can also be further achieved by the following technical solution: For the above-mentioned irregular pipe inner circle grinding machine, the grinding machine also includes a control system and an outer cover. The outer cover is installed on the base, and the control system is installed inside the outer cover. The control system realizes the orderly operation of the above-mentioned motion mechanism.

[0010] The technical problem to be solved by the present invention can also be further achieved through the following technical solution: For the aforementioned irregular-shaped pipe inner circle grinding machine, a method for grinding the inner circle of irregular-shaped pipe is provided. This method is used for grinding irregular-shaped long pipes, and the steps of this method are as follows: (1) Production preparation: The outer circles at both ends of the workpiece are machined into perfect circles as machining references to facilitate chuck clamping and rotation; (2) Lifting and positioning: The workshop crane is manually operated to lift the workpiece onto the lifting and translation rollers. The handwheel is operated to lift the workpiece so that its axis is basically consistent with the chuck axis of the separable head frame chuck mechanism. The handwheel is operated to send one end of the workpiece into the chuck clamping area of ​​the separable head frame chuck mechanism. The chuck of the middle support chuck mechanism is automatically or manually moved into the clamping range of the other end of the workpiece. The chucks of the separable headstock chuck mechanism and the chucks of the middle support chuck mechanism clamp the workpieces respectively. The operating handwheel lowers the translation drive wheel by a certain distance to avoid interference with the workpiece when it rotates. (3) Tool setting and trial cutting: Operate the slide table motion mechanism to make the inner circle of the workpiece enter the workpiece range of the grinding spindle motion mechanism, start the fixed headstock motion mechanism to make the workpiece rotate, operate the drive motor with handwheel adjustment to make the grinding spindle feed the tool setting in the workpiece radius direction. When setting the tool, it is necessary to start from the smallest inner diameter, otherwise the tool may collide when the automatic tool feed is used. After tool setting is completed, a test cut is performed. The test cut function is achieved through the combined motion of the slide table motion mechanism, the fixed headstock motion mechanism, the grinding spindle motion mechanism, and the grinding feed motion mechanism. If the test cut function is not normal, relevant adjustments are made; if the test cut function is normal, proceed to the next step. (4) Automatic grinding: Set the relevant parameters on the control system according to the characteristics of the workpiece, and the equipment will carry out automatic processing mode; because there are impurities of a certain depth on the inner surface, automatic grinding can be carried out in multiple times, and workers need to help identify and confirm the amount of impurities remaining in the middle. (5) Workpiece unloading: Operate the handwheel to lift and carry the workpiece, release the workpiece from the chuck of the separable head chuck mechanism and the chuck of the middle support chuck mechanism respectively, automatically or manually operate to remove the chuck of the middle support chuck mechanism from the clamping range of one end of the workpiece, operate the handwheel to remove the other end of the workpiece from the clamping area of ​​the chuck of the separable head chuck mechanism, and manually operate the workshop crane to lift the workpiece away from the lifting and translating rollers. (6) This workflow is complete and awaits the next workflow cycle.

[0011] The technical problem to be solved by the present invention can also be further achieved through the following technical solution: For the aforementioned irregular-shaped pipe inner circle grinding machine, a method for grinding the inner circle of irregular-shaped pipe is provided. This method is used for grinding irregular-shaped short pipes, and the steps of this method are as follows: (1) Production preparation: The outer circles at both ends of the workpiece are machined into perfect circles as machining references to facilitate chuck clamping and rotation; all lifting and translation rollers are removed from the equipment; the separable headstock chuck mechanism is disengaged from the fixed headstock drive mechanism, and at this time the separable headstock chuck mechanism is used as a non-powered driven chuck. (2) Lifting and positioning: The manual operation of the workshop crane lifts one end of the workpiece to the chuck clamping area of ​​the middle support chuck mechanism, moves the chuck of the separable head frame chuck mechanism into the clamping area of ​​the other end of the workpiece, and the chuck of the separable head frame chuck mechanism and the chuck of the middle support chuck mechanism clamp the workpiece respectively. (3) Tool setting and trial cutting: Operate the slide table motion mechanism to make the inner circle of the workpiece enter the workpiece range of the grinding spindle motion mechanism, start the fixed headstock motion mechanism to make the workpiece rotate, operate the drive motor with handwheel adjustment to make the grinding spindle feed the tool setting in the workpiece radius direction. When setting the tool, it is necessary to start from the smallest inner diameter, otherwise the tool may collide when the automatic tool feed is used. After tool setting is completed, a test cut is performed. The test cut function is achieved through the combined motion of the slide table motion mechanism, the fixed headstock motion mechanism, the grinding spindle motion mechanism, and the grinding feed motion mechanism. If the test cut function is not normal, relevant adjustments are made; if the test cut function is normal, proceed to the next step. (4) Automatic grinding: Set the relevant parameters on the control system according to the characteristics of the workpiece, and the equipment will carry out automatic processing mode; because there are impurities of a certain depth on the inner surface, automatic grinding can be carried out in multiple times, and workers need to help identify and confirm the amount of impurities remaining in the middle. (5) Workpiece unloading: First, use slings to fix and support the workpiece. Then, release the workpiece from the chuck of the separable head chuck mechanism and the chuck of the middle support chuck mechanism respectively. Operate the chuck of the separable head chuck mechanism to disengage from the clamping range of one end of the workpiece. Operate the workshop crane to disengage the other end of the workpiece from the clamping area of ​​the chuck of the middle support chuck mechanism. Finally, manually operate the workshop crane to completely lift the workpiece away from the equipment. (6) This workflow is complete and awaits the next workflow cycle.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention provides a grinding machine and method for the inner circle of irregular pipe fittings, which uses lifting and translating rollers to send the workpiece into the gripper of the head frame area, which can prevent the chuck and gripper from scratching the outer circle and end face of the irregular pipe fittings. 2. This invention employs a detachable headstock chuck mechanism. When machining irregularly shaped long tubes, the detachable headstock chuck mechanism remains connected to the fixed headstock drive mechanism. In this state, the detachable headstock chuck mechanism provides the rotational power source, while the middle support chuck mechanism obtains power from the fixed headstock drive mechanism via a synchronous transmission shaft and also functions as a drive chuck. When machining irregularly shaped short tubes, the detachable headstock chuck mechanism is disengaged from the fixed headstock drive mechanism. In this state, the detachable headstock chuck mechanism acts as a passive, unpowered chuck, while the middle support chuck mechanism provides the power source. This design adapts to the clamping and rotational displacement requirements of both ends of irregularly shaped long and short tubes. 3. This invention adopts a dual-mode operation of automatic and manual operation to replace the original manual grinding mode, thereby improving production efficiency. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the grinding long tube of the present invention; Figure 2 This is a three-dimensional structural diagram of the short tube being polished according to the present invention; Figure 3 This is a schematic diagram of the internal three-dimensional structure of the present invention; Figure 4 This is a three-dimensional structural schematic diagram of the lifting and translating idler roller of the present invention; Figure 5 This is a three-dimensional structural schematic diagram of the chuck mechanism of the present invention; Figure 6 This is a three-dimensional structural schematic diagram of the chuck mechanism of the present invention; Figure 7 This is a three-dimensional structural schematic diagram of the detachable headstock chuck mechanism of the present invention; Figure 8 This is a three-dimensional structural schematic diagram of the detachable headstock chuck mechanism of the present invention; Figure 9 This is a schematic diagram of the irregularly shaped pipe fitting polished according to the present invention. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] Reference Figure 1 , Figure 2 , Figure 3 and Figure 9 A grinding machine for the inner circle of irregularly shaped pipe fittings includes a slide table motion mechanism, a fixed headstock motion mechanism, a grinding spindle motion mechanism, a grinding feed motion mechanism, a lifting and translating support roller 6, a middle support chuck mechanism 5, an outer cover 1, and a control system 8. The slide table motion mechanism includes a slide table 13, a drive motor 12, a base 14, and an internal transmission mechanism. The slide table 13 is mounted on the base 14 via a guide rail. The drive motor 12 provides driving force through the internal transmission mechanism to achieve reciprocating linear motion in the length direction of the base 14, thereby realizing the axial feed motion of the workpiece. The fixed headstock motion mechanism includes a drive motor 9, a fixed base 18, a separable headstock chuck mechanism 3, and a fixed headstock drive mechanism 2. The separable headstock chuck mechanism 3 is connected to the fixed headstock drive mechanism 2. At the same time, the separable headstock chuck mechanism 3 is connected to the linear guide rail 21 on the slide table 13 through the slider 3-6. The fixed headstock drive mechanism 2 is connected to the fixed base 18, and the fixed base 18 is connected to the fixed base 14. The drive motor 9 provides power to the fixed headstock drive mechanism 2. The fixed headstock motion mechanism can realize the workpiece drive rotation. When processing short pipes, the separable headstock chuck mechanism is in a disengaged state from the fixed headstock drive mechanism. At this time, the separable headstock chuck mechanism can slide automatically on the linear guide rail 21 and act as a driven chuck without power. The grinding spindle motion mechanism includes a grinding spindle 10, a drive motor 11, a base 16, and an internal transmission mechanism. The grinding spindle 10 has a grinding wheel and a circulating coolant circuit installed at its end. The grinding spindle 10 is connected to the drive motor 11 via the internal transmission mechanism. Both the grinding spindle 10 and the drive motor 11 are mounted on the base 16, which slides freely on the base 20. The grinding spindle motion mechanism enables automatic grinding of the workpiece and automatic cooling of the grinding area. The grinding feed motion mechanism includes a drive motor 15 with a handwheel adjustment, a base 20, and an internal transmission mechanism. The base 20 is connected to the base 14. The drive motor 15 with a handwheel adjustment is connected to the base 20 via the internal transmission mechanism. The grinding feed motion mechanism enables the grinding spindle motion mechanism to perform cutting feed motion in the workpiece radial direction. The lifting and translating roller 6 provides auxiliary support, manual lifting, and manual translation of the workpiece after loading, assisting in chuck centering and ensuring precise clamping to prevent damage from bumps to the workpiece surface. The middle chuck mechanism 5 obtains power from the fixed headstock drive mechanism 2 via the synchronous transmission shaft 19 to drive the workpiece rotation, and can operate automatically or manually on the linear guide rail 21. The outer cover 1 is mounted on the base 14, and the control system 8 is installed inside the outer cover 1, enabling the orderly operation of the aforementioned motion mechanisms. This invention achieves auxiliary loading of long and short tubes in high-purity quartz shaped tubing, flexible clamping and rotation at both ends, and automatic grinding of the inner circle. It solves a series of problems existing in high-purity quartz shaped tubing, such as deviations in the concentricity of the inner and outer circles, a certain degree of curvature in the inner circle, irregular shape of the outer circle, and certain depth of impurities on the inner circle surface. It reduces the intensity of traditional manual grinding, improves production efficiency, automation level, workpiece dimensional accuracy, and workpiece surface quality.

[0016] Reference Figure 4 The lifting and translation roller 6 comprises a handwheel 6-1, a handwheel 6-4, a translation drive wheel 6-2, a translation drive wheel 6-3, a lifting base 6-5, a translation base 6-6, a positioning pin 6-7, a positioning pin 6-8, and an internal transmission mechanism. The handwheel 6-1, translation drive wheel 6-2, and translation drive wheel 6-3 are all mounted on the lifting base 6-5. The handwheel 6-1 drives the translation drive wheel 6-2 and translation drive wheel 6-3 to rotate through the internal transmission mechanism, thereby realizing the translational movement of the workpiece. The handwheel 6-4, the lifting base... 6-5 is connected to the translation base 6-6. The handwheel 6-4 realizes the lifting and lowering movement of the lifting base 6-5 through the internal transmission mechanism, realizing the manual adjustment of the centering of the workpiece and the chuck. The positioning pins 6-7 and 6-8 are installed on the lower side of the translation base 6-6, and the precise positioning and installation of the lifting and translation roller 6 is realized through the positioning pin holes on the slide table 13. The lifting and translation roller 6 can be freely selected and matched according to the different lengths of the irregular tube. In principle, the longer the workpiece, the more rollers are needed. When the workpiece is short, all rollers are removed and detached from the slide table 13.

[0017] Reference Figure 5 , Figure 6The chuck mechanism 5 includes a base 5-3, sliders 5-5, locking cylinders 5-4, chuck 5-1, a drive motor 5-2 with handwheel adjustment, gears 5-6, 5-7, 5-8, and an internal transmission mechanism. The base 5-3 is connected to the linear guide rail 21 on the slide table 13 via several sliders 5-5. The drive motor 5-2 with handwheel adjustment is connected to the rack on the slide table 13 via a translation gear assembly, enabling automatic or manual operation to allow the chuck mechanism 5 to slide freely on the slide table 13. The locking cylinder 5-4 is mounted on the base 5-3 to automatically lock and position the chuck mechanism 5 after sliding. The chuck 5-1, gears 5-6, and 5-7 are all connected to the base 5-3. Gear 5-7... The chuck 5-1 is connected to the keyed synchronous drive shaft 19 and can slide freely relative to it. The chuck 5-1 is connected to the synchronous drive shaft 19 through gears 5-6, 5-7 and 5-8, thereby obtaining rotational power and rotating synchronously with the separable headstock chuck mechanism 3, so as to realize synchronous drive rotation of both ends of the workpiece.

[0018] Reference Figure 7 , Figure 8 The separable headstock chuck mechanism 3 comprises a base 3-5, a slider 3-6, a locking cylinder 3-4, a separable connecting shaft 3-2, a flat key 3-3, a chuck 3-1, grippers 3-7, gripper sleeves 3-8, an extended gripper sleeve assembly 3-9, and an internal transmission mechanism. The base 3-5 is connected by several sliders 3-6. The detachable headstock chuck mechanism 3 is connected to the linear guide rail 21 on the slide table 13, enabling free sliding of the manually operated detachable headstock chuck mechanism 3 on the slide table 13. The locking cylinder 3-4 is installed on the base 3-5 to achieve automatic locking and positioning after the detachable headstock chuck mechanism 3 moves. The detachable connecting shaft 3-2 is connected to the base 3-5 through a bearing, and the flat key 3-3 is connected to the detachable connecting shaft 3-2. When switching between processing irregular short tubes and irregular long tubes, the detachable headstock chuck mechanism 3 and the fixed headstock drive mechanism 2 can be manually separated or connected through the detachable connecting shaft 3-2 and the flat key 3-3. The chuck 3-1 is connected to the base 3-5 through the detachable connecting shaft 3-2. The surface of several grippers 3-7 of the chuck 3-1 is covered with flexible material 3-8 to prevent damage to the workpiece. Several sets of extended gripper sleeve assemblies 3-9 are also configured to facilitate auxiliary feeding and workpiece bearing.

[0019] Reference Figure 9 The outer circle 4-2 of the workpiece has an irregular shape, the inner circle 4-1 has a certain degree of curvature, the outer circle axis 4-4 and the inner circle axis 4-3 are not concentric, and there are certain impurities on the surface of the inner circle 4-1.

[0020] Reference Figures 1 to 9 A method for grinding the inner circle of irregularly shaped pipe fittings, the basic execution process of grinding irregularly shaped long pipes is as follows: Step 1, Production Preparation: Machin the outer circles at both ends of workpiece 4 into perfect circles as machining references to facilitate chuck clamping and rotation.

[0021] The second step is hoisting and positioning: The workshop crane is manually operated to hoist the workpiece 4 onto the lifting and translating roller 6. The handwheel 6-4 is operated to lift the workpiece 4 so that its axis is basically aligned with the axis of the chuck 3-1 of the separable head frame chuck mechanism 3. The handwheel 6-1 is operated to send one end of the workpiece 4 into the clamping area of ​​the chuck 3-1 of the separable head frame chuck mechanism 3. The chuck 5-1 of the middle support chuck mechanism 5 is automatically or manually moved into the clamping range of the other end of the workpiece 4. The chuck 3-1 of the separable head frame chuck mechanism 3 and the chuck 5-1 of the middle support chuck mechanism 5 clamp the workpiece respectively. The handwheel 6-4 lowers the translation drive wheel 6-2 and the translation drive wheel 6-3 a certain distance to avoid interference with the workpiece 4 when it rotates.

[0022] The third step is tool setting and trial cutting: Operate the slide table motion mechanism to bring the inner circle of workpiece 4 into the workpiece range of the grinding spindle motion mechanism, start the fixed headstock motion mechanism to rotate workpiece 4, and operate the drive motor 15 with handwheel adjustment to feed the grinding spindle 10 in the workpiece radius direction for tool setting. Tool setting must start from the smallest diameter of the inner circle; otherwise, the tool may collide during automatic tool feeding. After tool setting, perform a trial cut. The trial cut function is achieved through the combined motion of the slide table motion mechanism, the fixed headstock motion mechanism, the grinding spindle motion mechanism, and the grinding feed motion mechanism. If the trial cut function is not normal, make relevant adjustments. If the trial cut function is normal, proceed to the next step. To solve the problem of concentricity deviation between the inner and outer circles, it is necessary to clamp the inner circles on both sides and machine the outer circle, which will not be elaborated here.

[0023] The fourth step is automatic grinding: taking into account the cylindricity of the inner circle and the grinding depth of impurities, the relevant parameters are set on the control system 8 according to the characteristics of the workpiece, and the equipment enters the automatic processing mode; because there are impurities of a certain depth on the inner circle surface, automatic grinding can be carried out in multiple times, and workers need to help identify and confirm the amount of impurities remaining in between. Step 5, workpiece unloading: Operate handwheel 6-4 to lift and support workpiece 4. The chuck 3-1 of the separable head chuck mechanism 3 and the chuck 5-1 of the middle support chuck mechanism 5 release the workpiece respectively. Automatically or manually operate the chuck 5-1 of the middle support chuck mechanism 5 to disengage from the clamping range of one end of workpiece 4. Operate handwheel 6-1 to disengage the other end of workpiece 4 from the clamping area of ​​the chuck 3-1 of the separable head chuck mechanism 3. Manually operate the workshop crane to lift workpiece 4 away from the lifting and translating roller 6.

[0024] Step 6: This workflow is now complete. Waiting for the next workflow cycle.

[0025] Reference Figures 1 to 9 A method for grinding the inner circle of irregularly shaped pipe fittings, the basic execution process of grinding irregularly shaped short pipes is as follows: Step 1, Production Preparation: Machining the outer circles at both ends of workpiece 4 into perfect circles as machining references to facilitate chuck clamping and rotation; removing all lifting and translation rollers 6 from the equipment; the separable headstock chuck mechanism 3 is disengaged from the fixed headstock drive mechanism 2, at which point the separable headstock chuck mechanism acts as a non-powered driven chuck. The second step is hoisting and positioning: the workshop crane is manually operated to hoist one end of the workpiece 4 to the clamping area of ​​the chuck 5-1 of the middle support chuck mechanism 5, and the chuck 3-1 of the separable head frame chuck mechanism 3 is moved into the clamping area of ​​the other end of the workpiece 4. The chuck 3-1 of the separable head frame chuck mechanism 3 and the chuck 5-1 of the middle support chuck mechanism 5 clamp the workpiece respectively. The third step is tool setting and trial cutting: Operate the slide table motion mechanism to bring the inner circle of workpiece 4 into the workpiece range of the grinding spindle motion mechanism, start the fixed headstock motion mechanism to rotate workpiece 4, and operate the drive motor 15 with handwheel adjustment to feed the grinding spindle 10 in the workpiece radius direction for tool setting. Tool setting must start from the smallest diameter of the inner circle; otherwise, the tool may collide during automatic tool feeding. After tool setting, perform a trial cut. The trial cut function is achieved through the combined motion of the slide table motion mechanism, the fixed headstock motion mechanism, the grinding spindle motion mechanism, and the grinding feed motion mechanism. If the trial cut function is not normal, make relevant adjustments. If the trial cut function is normal, proceed to the next step. To solve the problem of concentricity deviation between the inner and outer circles, it is necessary to clamp the inner circles on both sides and machine the outer circle, which will not be elaborated here.

[0026] The fourth step is automatic grinding: taking into account the cylindricity of the inner circle and the grinding depth of impurities, the relevant parameters are set on the control system 8 according to the characteristics of the workpiece, and the equipment enters the automatic processing mode; because there are impurities of a certain depth on the inner circle surface, automatic grinding can be carried out in multiple times, and workers need to help identify and confirm the amount of impurities remaining in between. Step 5, workpiece unloading: First, use slings to fix and support workpiece 4. Then, release the workpiece from the chuck 3-1 of the separable head chuck mechanism 3 and the chuck 5-1 of the middle support chuck mechanism 5. Operate the chuck 3-1 of the separable head chuck mechanism 3 to disengage from the clamping range of one end of workpiece 4. Operate the workshop crane to disengage the other end of workpiece 4 from the clamping area of ​​the chuck 5-1 of the middle support chuck mechanism 5. Finally, manually operate the workshop crane to completely lift workpiece 4 off the equipment.

[0027] Step 6: This workflow is now complete. Waiting for the next workflow cycle.

[0028] In summary, this invention enables auxiliary feeding of long and short tubes in high-purity quartz irregular-shaped tubes, flexible clamping and rotation at both ends, and automatic grinding of the inner circle. This solves a series of problems existing in high-purity quartz irregular-shaped tubes, such as deviations in the concentricity of the inner and outer circles, a certain degree of curvature of the inner circle, irregular shape of the outer circle, and a certain depth of impurities on the inner circle surface. This reduces the intensity of traditional manual grinding and improves production efficiency, automation level, workpiece dimensional accuracy, and workpiece surface quality.

Claims

1. A grinding machine for the inner circle of irregularly shaped pipe fittings, characterized in that: It includes a slide table motion mechanism, a fixed headstock motion mechanism, a grinding spindle motion mechanism, a grinding feed motion mechanism, a lifting and translating idler roller (6), and a center chuck mechanism (5); The slide table motion mechanism includes a slide table (13), a drive motor (12) and a base (14). The slide table (13) is mounted on the base (14) via a guide rail. The drive motor (12) is mounted on the base (14) and is connected to the slide table (13) for transmission. It is used to drive the slide table (13) to reciprocate linearly along the guide rail in the length direction of the base (14) to realize the axial feeding motion of the workpiece. The fixed headstock motion mechanism includes a drive motor (9), a fixed base (18), a separable headstock chuck mechanism (3), and a fixed headstock drive mechanism (2). The separable headstock chuck mechanism (3) is connected to the fixed headstock drive mechanism (2), and the separable headstock chuck mechanism (3) is connected to the linear guide rail (21) set on the slide table (13) through the slider (3-6). The fixed headstock drive mechanism (2) is connected to the fixed base (18), and the fixed base (18) is connected to the base (14). The drive motor (9) is connected to the fixed headstock drive mechanism (2) for transmission, which is used to realize the workpiece drive rotation. The grinding spindle motion mechanism includes a grinding spindle (10), a drive motor (11), and a base (16). The end of the grinding spindle (10) is equipped with a grinding wheel and a circulating coolant circuit. The grinding spindle (10) and the drive motor (11) are both mounted on the base (16). The base (16) is slidably mounted on the base (20). The grinding spindle (10) and the drive motor (11) are connected in a transmission. The grinding feed motion mechanism includes a drive motor (15) with handwheel adjustment and a base (20). The base (20) is connected to the base (14). The drive motor (15) with handwheel adjustment is connected to the base (20) for driving the base (20) to drive the grinding spindle motion mechanism to perform cutting feed motion in the workpiece radius direction. The lifting and translating roller (6) is used to provide auxiliary support, manual lifting and manual translation of the workpiece after it is loaded, and to assist the workpiece in chuck centering, so as to facilitate accurate clamping of the chuck and prevent damage to the workpiece surface. The chuck mechanism (5) obtains power from the fixed headstock drive mechanism (2) through the synchronous transmission shaft (19) to drive the workpiece to rotate, and at the same time, it runs automatically or manually on the linear guide rail (21).

2. The inner circle grinding machine for irregularly shaped pipe fittings according to claim 1, characterized in that: The separable headstock chuck mechanism (3) includes a base (3-5), a slider (3-6), a locking cylinder (3-4), a separable connecting shaft (3-2), a flat key (3-3), a chuck (3-1), a gripper (3-7), a gripper sleeve (3-8), and an extended gripper sleeve assembly (3-9). The base (3-5) is connected to the linear guide rail (21) set on the slide table (13) through the slider (3-6), so as to realize the free sliding of the separable headstock chuck mechanism (3) on the slide table (13) by manual operation. The locking cylinder (3-4) is mounted on the base (3-5) for automatically locking and positioning the separable headstock chuck mechanism (3) after it has moved. The separable connecting shaft (3-2) is connected to the base (3-5) via a bearing, and the flat key (3-3) is connected to the separable connecting shaft (3-2). When switching between processing irregular short tubes and irregular long tubes, the separable headstock chuck mechanism (3) and the fixed headstock drive mechanism (2) can be manually separated or connected via the separable connecting shaft (3-2) and the flat key (3-3). The chuck (3-1) is connected to the base (3-5) via a separable connecting shaft (3-2). The gripper (3-7) of the chuck (3-1) is fitted with a flexible material (3-8) to prevent damage to the workpiece.

3. The inner circle grinding machine for irregularly shaped pipe fittings according to claim 2, characterized in that: The chuck (3-1) is also equipped with several sets of extended jaw sleeve assemblies (3-9) on its jaws (3-7) for assisting in feeding and carrying workpieces.

4. The inner circle grinding machine for irregularly shaped pipe fittings according to claim 1, characterized in that: When processing short pipes, the separable headstock chuck mechanism is disengaged from the fixed headstock drive mechanism. At this time, the separable headstock chuck mechanism slides automatically on the linear guide rail (21) as a passive chuck without power.

5. The inner circle grinding machine for irregularly shaped pipe fittings according to claim 1, characterized in that: The grinder also includes a control system (8) and an outer cover (1). The outer cover (1) is mounted on the base (14), and the control system (8) is mounted inside the outer cover (1). The control system (8) enables the above-mentioned motion mechanism to operate in an orderly manner.

6. A method for grinding the inner circle of irregularly shaped pipe fittings, characterized in that: This method uses the inner circle grinding machine for irregularly shaped pipes as described in any one of claims 1-5. The method is used for grinding irregularly shaped long pipes, and the steps are as follows: (1) Production preparation: The outer circles at both ends of the workpiece (4) are machined into perfect circles as machining references to facilitate chuck clamping and rotation; (2) Lifting and positioning: The workshop crane is manually operated to lift the workpiece (4) onto the lifting and translation roller (6). The handwheel (6-4) is operated to lift the workpiece (4) so ​​that its axis is basically consistent with the axis of the chuck (3-1) of the separable head frame chuck mechanism (3). The handwheel (6-1) is operated to send one end of the workpiece (4) into the clamping area of ​​the chuck (3-1) of the separable head frame chuck mechanism (3). The chuck (5-1) of the middle support chuck mechanism (5) is automatically or manually operated to enter the clamping range of the other end of the workpiece (4). The chuck (3-1) of the separable headstock chuck mechanism (3) and the chuck (5-1) of the middle support chuck mechanism (5) clamp the workpiece respectively. The operating handwheel (6-4) lowers the translation drive wheel (6-2) and translation drive wheel (6-3) by a certain distance to avoid interference with the workpiece (4) when it rotates. (3) Tool setting and trial cutting: Operate the slide table motion mechanism to make the inner circle of the workpiece (4) enter the workpiece range of the grinding spindle motion mechanism, start the fixed headstock motion mechanism to make the workpiece (4) rotate, operate the drive motor (15) with handwheel adjustment to make the grinding spindle (10) feed the tool setting in the workpiece radius direction. When setting the tool, it is necessary to start from the smallest inner circle diameter, otherwise it is easy to hit the tool when the automatic tool feed is used. After tool setting is completed, a test cut is performed. The test cut function is achieved through the combined motion of the slide table motion mechanism, the fixed headstock motion mechanism, the grinding spindle motion mechanism, and the grinding feed motion mechanism. If the test cut function is not normal, relevant adjustments are made; if the test cut function is normal, proceed to the next step. (4) Automatic grinding: Set the relevant parameters on the control system (8) according to the characteristics of the workpiece, and the equipment will carry out automatic processing mode; because there are impurities of a certain depth on the inner circle surface, automatic grinding can be carried out in multiple times, and workers need to help identify and confirm the amount of impurities remaining in the middle. (5) Unloading the workpiece: The handwheel (6-4) is used to lift and carry the workpiece (4). The chuck (3-1) of the separable head chuck mechanism (3) and the chuck (5-1) of the middle support chuck mechanism (5) release the workpiece respectively. The chuck (5-1) of the middle support chuck mechanism (5) is automatically or manually removed from the clamping range of one end of the workpiece (4). The handwheel (6-1) is used to remove the other end of the workpiece (4) from the clamping area of ​​the chuck (3-1) of the separable head chuck mechanism (3). The workshop crane is manually operated to lift the workpiece (4) away from the lifting and translation roller (6). (6) This workflow is complete and awaits the next workflow cycle.

7. A method for grinding the inner circle of irregularly shaped pipe fittings, characterized in that: This method uses the inner circle grinding machine for irregularly shaped pipes as described in any one of claims 1-5. The method is used for grinding irregularly shaped short pipes, and the steps are as follows: (1) Production preparation: The outer circles at both ends of the workpiece (4) are machined into perfect circles as machining references to facilitate chuck clamping and rotation; all lifting and translation rollers (6) are removed from the equipment; the separable head frame chuck mechanism (3) is disengaged from the fixed head frame drive mechanism (2), and at this time the separable head frame chuck mechanism is used as a non-powered driven chuck. (2) Lifting and positioning: The manual operation of the workshop crane lifts one end of the workpiece (4) to the clamping area of ​​the chuck (5-1) of the middle support chuck mechanism (5), and moves the chuck (3-1) of the separable head frame chuck mechanism (3) into the clamping area of ​​the other end of the workpiece (4). The chuck (3-1) of the separable head frame chuck mechanism (3) and the chuck (5-1) of the middle support chuck mechanism (5) clamp the workpiece respectively. (3) Tool setting and trial cutting: Operate the slide table motion mechanism to make the inner circle of the workpiece (4) enter the workpiece range of the grinding spindle motion mechanism, start the fixed headstock motion mechanism to make the workpiece (4) rotate, operate the drive motor (15) with handwheel adjustment to make the grinding spindle (10) feed the tool setting in the workpiece radius direction. When setting the tool, it is necessary to start from the smallest inner circle diameter, otherwise it is easy to hit the tool when the automatic tool feed is used. After tool setting is completed, a test cut is performed. The test cut function is achieved through the combined motion of the slide table motion mechanism, the fixed headstock motion mechanism, the grinding spindle motion mechanism, and the grinding feed motion mechanism. If the test cut function is not normal, relevant adjustments are made; if the test cut function is normal, proceed to the next step. (4) Automatic grinding: Set the relevant parameters on the control system (8) according to the characteristics of the workpiece, and the equipment will carry out automatic processing mode; because there are impurities of a certain depth on the inner circle surface, automatic grinding can be carried out in multiple times, and workers need to help identify and confirm the amount of impurities remaining in the middle. (5) Workpiece unloading: First, use slings to fix and support the workpiece (4). The chuck (3-1) of the separable head chuck mechanism (3) and the chuck (5-1) of the middle support chuck mechanism (5) release the workpiece respectively. Operate the chuck (3-1) of the separable head chuck mechanism (3) to get away from the clamping range of one end of the workpiece (4). Operate the workshop crane to get the other end of the workpiece (4) away from the clamping area of ​​the chuck (5-1) of the middle support chuck mechanism (5). Finally, manually operate the workshop crane to completely lift the workpiece (4) away from the equipment. (6) This workflow is complete and awaits the next workflow cycle.

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