Suitable for all-round grinding processes of slender tubes, including contours, end faces, and inner holes.

Abstract

This invention discloses a comprehensive grinding process for the contour, end face, and inner hole of slender tubes, comprising the following sequential grinding steps: S1, contour grinding; S2, end face grinding; S3, inner hole grinding. On one hand, this invention utilizes the position switching of the pressure roller to form a grinding stroke covering the entire slender tube. Under the single rotation positioning of the slender tube, it maintains the tube in an axial dynamic balance mode, achieving sequential left-right grinding followed by synchronous grinding of the contour surface. This not only achieves thorough grinding of the slender tube's contour surface without dead angles but also maintains consistent axial reference for high-quality grinding without axial movement or radial runout. On the other hand, by sequentially grinding the contour surface, end face, and inner hole of the slender tube, it not only eliminates radial runout defects caused by the contour surface during inner hole grinding but also, based on the centering grinding of the end face, further corrects the rotation center of the slender tube, providing the necessary conditions for high-quality inner hole grinding. This allows for efficient and high-yield comprehensive grinding of slender tubes.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of polishing machines, and particularly relates to a profile, end face and inner hole all-around polishing process for an elongated pipe. BACKGROUND

[0002] At present, if the conventional elongated pipe polishing needs to be all-around polished, it needs to be processed in several times, for example, profile polishing, end face polishing and inner hole polishing. For the profile polishing, due to the characteristics of the pipe on site, positioning cannot be formed from both ends, and the pipe is supported to form overall positioning, and the positioning will form a restriction. Then, the profile polishing is divided into two steps. In the first step, half of the polishing is completed from one end to the positioning point. In the second step, the elongated pipe is reversed, and the positioning position is applied to the pipe wall which has been polished. Then, the other half of the polishing is completed from the other end to the positioning point. Therefore, the following technical defects exist.

[0003] 1) In the profile polishing process, not only two times of positioning are needed, but also the two times of positioning points cannot be the same, that is, the reference formed by the two-step polishing cannot be consistent, so that the polishing precision cannot meet the requirements, and the rejection rate is extremely high. At the same time, the whole operation process is very complicated, and the profile polishing efficiency is very low.

[0004] 2) For the profile polishing, end face polishing and inner hole polishing, although the three are completed independently, the sequence is very important. If the profile is not polished when the inner hole is polished, once the elongated pipe jumps radially due to the profile, the center line of the polishing head and the center line of the elongated pipe do not coincide, so that the overall polishing of the inner surface cannot be realized, and the probability of local transition grinding is large. Therefore, the final grinding quality is directly affected. SUMMARY

[0005] The present application aims at overcoming the defects in the prior art, and providing an improved profile, end face and inner hole all-around polishing process for an elongated pipe.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows.

[0007] A profile, end face and inner hole all-around polishing process for an elongated pipe, which comprises the following polishing steps in sequence:

[0008] S1, profile polishing

[0009] Firstly, the elongated tube is freely rolled on the rolling support wheel groups to form rolling support areas, the rolling support areas are aligned to form a bearing area, the center of the bearing area is aligned with the center of the elongated tube, and the center of the bearing area is used as a reference to form a lower pressing wheel group on the opposite sides of the reference, which can be switched and rolled downward on the elongated tube, wherein the lower pressing point formed by the lower pressing wheel group and the bearing area cooperates to form a positioning channel, and the elongated tube is driven to rotate around its axis based on the lower pressing wheel group and / or the rolling support wheel group;

[0010] Secondly, based on the switching cooperation of the grinding head at the left and right ends of the elongated tube and the lower pressing point formed by the lower pressing wheel group, left and right grinding strokes extending from the end to the middle are formed, and the left and right grinding strokes overlap or align at the middle of the elongated tube, and the rotating direction of the grinding head is opposite to the rotating direction of the elongated tube, wherein when the left grinding stroke is grinding, the left grinding head moves to the middle of the elongated tube, the right grinding head contacts the right end of the elongated tube to form an axial dynamic balance aid, then the left grinding head moves to the left end of the elongated tube and the remaining end head pauses grinding, and the right grinding stroke is implemented by switching the lower pressing point of the lower pressing wheel group, the right grinding head moves to the middle of the elongated tube and grinds to the right, at this time the left grinding head forms an axial dynamic balance aid, and the left and right grinding strokes are completed synchronously during the relative movement of the left and right grinding heads;

[0011] S2, end face grinding

[0012] The two end grinding heads are synchronized, and the rotating direction of the grinding head and the elongated tube is opposite.

[0013] S3, inner hole grinding

[0014] The two end grinding heads are synchronized, and the rotating direction of the grinding head and the elongated tube is opposite.

[0015] Preferably, in step S1, each rolling support wheel group includes two support wheels with parallel axes and relative spacing. Based on the rolling support formed by the two support wheels, the rotation of the elongated tube is facilitated.

[0016] According to a specific implementation and preferred aspect of the present application, one of the two support wheels is a driving wheel, and the other support wheel and the lower pressing wheel of the lower pressing wheel group are driven wheels. Based on one power, the rotation of the elongated tube is implemented.

[0017] Preferably, the plurality of driving wheels are coaxial. In this way, a power motor can synchronously drive the plurality of driving wheels to rotate synchronously.

[0018] According to a specific implementation and preferred aspect of the present application, the two sets of rolling support wheels are arranged at a distance of 1 / 3~1 / 2 of the length of the elongated tube. The two-point-determining-a-straight-line principle is adopted to form the simplest support, and the distance arrangement can form better support based on the left and right polishing strokes to reduce the radial runout of the elongated tube.

[0019] Preferably, the pressing wheel set comprises a frame, a left wheel seat and a right wheel seat respectively mounted on the frame for up and down movement, and a left pressing wheel and a right pressing wheel respectively mounted on the left wheel seat and the right wheel seat, wherein one of the left pressing wheel and the right pressing wheel is pressed on the elongated tube based on the movement of the left wheel seat and the right wheel seat. In short, the switching of the wheel seats is used to achieve the switching of the pressing wheels.

[0020] In some specific implementations, the left pressing wheel and the right pressing wheel are arranged between the two sets of rolling support wheels, and in the axial projection of the elongated tube, one of the left pressing wheel and the right pressing wheel and the two support wheels of the rolling support wheel set are tangent to the elongated tube, and the centers of the pressing wheel and the support wheels are arranged in an equilateral triangle, wherein the center of the equilateral triangle coincides with the center of the elongated tube. The pressing wheel and the two sets of support wheels arranged in a staggered and overall triangular arrangement form the rotational positioning of the elongated tube, avoiding axial movement and radial runout of the elongated tube.

[0021] Preferably, the frame comprises a base frame and a displacement frame, wherein the displacement frame is mounted on the base frame and can move horizontally along the direction parallel to the axis of the pressing wheel, and the left wheel seat and the right wheel seat are respectively slidably mounted on the displacement frame along the up and down direction.

[0022] According to another specific implementation and preferred aspect of the present application, in the grinding in step S1, the axial dynamic balance assistance forms a balance force in the opposite direction based on the grinding contact or the reverse movement, so that the profile grinding of the elongated tube is carried out without axial displacement. Based on the axial dynamic balance, the axial movement of the elongated tube caused by the profile grinding is further reduced.

[0023] Preferably, in step S1, the rotational speeds of the two polishing heads are equal and rotate in the same direction. Avoiding the axial movement of the elongated tube caused by rotation.

[0024] Preferably, in step S1, when the left polishing head forms the axial dynamic balance assistance, the horizontal movement speed of the left polishing head is less than that of the right polishing head, and both keep synchronous with the elongated tube. This also further avoids the axial movement of the elongated tube caused by the profile grinding.

[0025] According to another specific implementation and preferred aspect of the present application, in step S2, the rolling frame wheel set and the positive pressing wheel set are used for circumferential rotational positioning. Based on the rotational positioning, the axial movement of the elongated tube caused by the end face grinding is eliminated.

[0026] In some specific embodiments, the rolling frame wheel assembly and the rolling support wheel assembly have the same structure. The positive pressure wheel assembly includes a positive pressure wheel aligned with the rolling frame wheel assembly and a power unit that drives the positive pressure wheel to press down or disengage. The positive pressure wheel and the two support wheels of the rolling frame wheel assembly are distributed in an equilateral triangle, and the center of the equilateral triangle coincides with the center of the slender tube. One of the positive pressure wheel and / or the support wheels is the driving wheel, and the others are driven wheels. In this case, there is no need to switch the position of the pressure wheel; a two-point rotation positioning method is directly used to keep the slender tube in a straight state for end face grinding.

[0027] Preferably, in step S2, the grinding heads rotate in the same direction and at the same speed to avoid axial movement of the slender tube caused by end-face grinding.

[0028] According to another specific embodiment and preferred aspect of the invention, in step S3, a rolling wheel set and a clamping wheel set are used for circumferential rotational positioning. This rotational positioning eliminates axial movement of the slender tube during internal grinding.

[0029] Preferably, the rolling wheel set and the rolling support wheel set have the same structure. The clamping wheel set includes a clamping wheel aligned with the rolling wheel set and a power component that drives the clamping wheel to press down or disengage. The clamping wheel and the two rollers of the rolling wheel set are distributed in an equilateral triangle, and the center of the equilateral triangle coincides with the center of the slender tube. One of the clamping wheel and / or rollers is the driving wheel, and the others are driven wheels. In this case, there is no need to switch the position of the pressure wheel; a two-point rotation positioning method is used to keep the slender tube in a straight position for internal hole grinding.

[0030] Furthermore, in step S3, the two internal grinding heads rotate in the same direction, and their grinding speed and moving speed are equal. This same speed and direction of rotation avoids torsion of the slender tube and unequal axial stress during synchronous grinding.

[0031] Furthermore, in step S3, the grinding areas formed during the counter-movement of the two inner grinding heads overlap. This overlap ensures that the grinding area fully covers the inner bore of the entire slender tube.

[0032] Furthermore, the contour grinding, end face grinding, and inner hole grinding are arranged sequentially and alternately, and a traversing robot arm with transfer grippers corresponding to the three grinding areas is used. These transfer grippers can simultaneously hold slender tubes located in each grinding area, and continuous transfer of the grinding process can be achieved with a single shift. The traversing robot arm quickly connects multiple grinding areas and more accurately performs center-aligned rotational positioning of slender tubes.

[0033] Due to the implementation of the above technical solutions, the present invention has the following advantages compared with the prior art:

[0034] In existing omnidirectional grinding of slender tubes, especially during contour surface grinding, not only is two positioning steps required, but the points used for these two positioning steps cannot be identical. This means the reference points formed by the two grinding steps cannot be consistent, resulting in insufficient grinding accuracy and an extremely high scrap rate. Furthermore, the entire operation is very cumbersome, and the efficiency of contour surface grinding is very low. In addition, although contour surface grinding, end face grinding, and internal hole grinding are performed independently, the order is crucial. If the contour surface is not ground during internal hole grinding, and the radial runout of the slender tube caused by the contour surface will lead to problems with the grinding head. The centerline of the slender tube does not coincide with the centerline, which not only makes it impossible to achieve comprehensive grinding of the inner surface, but also increases the probability of local over-grinding. Therefore, it directly affects the final grinding yield. This application provides an overall design for all-round grinding of the contour, end face, and inner hole of slender tubes, cleverly solving the shortcomings and defects of the prior art. After adopting this grinding process, the slender tube is first freely rolled on the rolling support area formed by multiple rolling support wheel sets. The multiple rolling support areas are aligned to form a bearing area, and the center of the bearing area is aligned with the center of the slender tube. At the same time, with the center of the bearing area as the reference, grinding is formed on both sides of the reference. A set of pressure wheels is capable of relatively switching and rolling downwards onto a slender tube. The pressure points formed by the pressure wheels and the bearing area cooperate to form a positioning channel. The slender tube is driven to rotate around its own axis within the positioning channel based on the pressure wheels and / or rolling support wheels. Then, based on the switching cooperation between the grinding heads at the left and right ends of the slender tube and the pressure points formed by the pressure wheels, left and right grinding strokes extending from the ends to the middle are formed respectively. The left and right grinding strokes overlap or align at the middle of the slender tube. Simultaneously, the rotation direction of the grinding heads is opposite to the rotation direction of the slender tube. During the left grinding stroke, the left grinding head moves to the middle of the slender tube, and the right grinding head... The grinding head contacts the right end of the slender tube to form an axial dynamic balance assist. Then, the left grinding head moves to the left to grind until it reaches the left end of the slender tube, and the remaining end is paused for grinding. At the same time, the pressure point of the pressure wheel group is switched to implement the right grinding stroke. The right grinding head moves to the middle of the slender tube and moves to the right to grind. At this time, the left grinding head forms an axial dynamic balance assist. The left and right grinding strokes are completed synchronously as the left and right grinding heads move towards each other to complete the contour surface grinding. Next, the slender tube with the contour surface ground is transferred to the end face grinding area. Then, the grinding heads at both ends are used synchronously, and the grinding heads and the slender tube rotate in opposite directions to grind to complete the end face grinding.Finally, the slender tube, after end face grinding, is transferred to the inner hole grinding area. Then, two internal grinding heads are used simultaneously, with the inner grinding heads and the slender tube rotating in opposite directions, to grind the inner hole of the slender tube. When the two internal grinding heads are close together, one continues forward while the other retreats to ensure the grinding covers the entire inner hole. Then, they move out in the opposite direction to complete the inner hole grinding. Therefore, compared with the prior art, this invention, on the one hand, forms a grinding stroke covering the entire slender tube based on the position switching of the pressure roller, and on the other hand, maintains the slender tube in axial dynamic balance during one rotational positioning of the slender tube. Under this method, the contour surface is ground step-by-step on both sides and then simultaneously. This not only achieves grinding of the slender tube contour surface without dead angles, but also maintains consistent axial reference for high-quality grinding without axial movement or radial runout. Furthermore, by sequentially grinding the contour surface, end face, and inner hole of the slender tube, not only are radial runout defects caused by the contour surface during inner hole grinding eliminated, but the centering grinding of the end face further corrects the rotation center of the slender tube, providing the necessary conditions for high-quality inner hole grinding. This allows for efficient and high-yield all-around grinding of the slender tube. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the omnidirectional polishing machine for slender tubes in this embodiment;

[0036] Figure 2 for Figure 1 Simplified structural diagram;

[0037] Figure 3 for Figure 2 Simplified structural diagram;

[0038] Figure 4 for Figure 3 Schematic diagram of the mid-contour surface grinding unit structure;

[0039] Figure 5 for Figure 3 Schematic diagram of the mid-end surface grinding unit structure;

[0040] Figure 6 for Figure 3 Schematic diagram of the inner hole grinding unit structure;

[0041] Figure 7 for Figure 3 A simplified schematic diagram illustrating the principle of grinding the middle contour surface in the left grinding stroke;

[0042] Figure 8 for Figure 3 A simplified schematic diagram illustrating the principle of grinding the middle contour surface during the right grinding stroke;

[0043] Figure 9 for Figure 3 Simplified schematic diagram of the grinding principle of the middle end face;

[0044] Figure 10 for Figure 3 Simplified schematic diagram of the grinding principle of the inner hole;

[0045] The components include: 1. Contour surface grinding unit; 10. Rolling support wheel assembly; 100. Support wheel; 101. Power component; 11. Lower pressure wheel assembly; 110. Frame; a. Base frame; b. Shifting frame; 111. Left wheel seat; 112. Right wheel seat; 113. Left lower pressure wheel; 114. Right lower pressure wheel; 12. Grinding head; 12L. Left grinding head; 12R. Right grinding head.

[0046] 2. End face grinding unit; 20. Rolling frame wheel assembly; 200. Frame wheel; 21. Positive pressure wheel assembly; 210. Positive pressure wheel; 211. Power unit; 22. Grinding head;

[0047] 3. Internal hole grinding unit; 30. Rolling wheel assembly; 300. Roller; 31. Pressing wheel assembly; 310. Pressing wheel; 311. Power unit; 32. Internal grinding head;

[0048] G, slender tube; S, transverse manipulator; s1, transfer gripper. Detailed Implementation

[0049] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0053] In this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0055] like Figures 1 to 10 As shown, the omnidirectional grinding process applicable to the contour, end face, and inner hole of slender tubes in this embodiment uses omnidirectional grinding equipment including contour grinding unit 1, end face grinding unit 2, and inner hole grinding unit 3.

[0056] Specifically, the contour grinding unit 1 includes two rolling support wheel sets 10, a pressure wheel set 11, and two grinding heads 12. Each rolling support wheel set 10 includes two support wheels 100 with parallel axes and spaced apart from each other, and a power component 101. The rolling support formed by the two support wheels 100 facilitates the rotation of the slender tube G. In this example, one of the two support wheels 100 is a driving wheel, and the other is a driven wheel (or follower wheel). The driving wheels of the two rolling support wheel sets 10 are connected by a synchronous shaft and then driven by the power component 101 (using a conventional motor and drive belt). The distance between the two rolling support wheel sets 10 is 1 / 3 to 1 / 2 of the length of the slender tube G. The simplest support is formed by using the principle of two points determining a straight line, and the distance layout can form better support based on the left and right grinding strokes to reduce the radial runout of the slender tube. The pressure roller assembly 11 includes a frame 110, a left wheel seat 111 and a right wheel seat 112 mounted on the frame 110 for vertical movement, a left pressure roller 113 and a right pressure roller 114 mounted on the left wheel seat 111 and right wheel seat 112 respectively, and a pressure drive. The movement of the left wheel seat 111 and right wheel seat 112 switches so that one of the left pressure roller 113 and right pressure roller 114 presses down onto the slender tube G. Both the left pressure roller 113 and right pressure roller 114 are driven rollers (or follower rollers). In short, the switching of the wheel seats achieves the switching of the pressure rollers. The frame 110 includes a base frame a and a shifting frame b. The shifting frame b is mounted on the base frame a and can be moved laterally along a direction parallel to the axis of the pressure roller. The left wheel seat 111 and the right wheel seat 112 are slidably mounted on the shifting frame b in the vertical direction, respectively. At the same time, the pressing power unit is used to drive the frame 110 to move laterally toward or away from the slender tube G, and to drive the left wheel seat 111 or the right wheel seat 112 to move up and down to achieve pressing and disengagement movements. It is driven by conventional pneumatic cylinders, hydraulic cylinders or electric cylinders, and is guided by corresponding slide rails. The lower left pressure roller 113 and the lower right pressure roller 114 are offset between the two rolling support roller sets 10. In the axial projection of the slender tube G, one of the pressure rollers 113 and 114, along with the two support rollers 100 of the rolling support roller set 10, are tangent to the slender tube G. The center of the pressure roller and the center of the support roller 100 form an equilateral triangle, with the center of the equilateral triangle coinciding with the center of the slender tube G. Based on the offset and triangular layout of the pressure rollers and the two sets of support rollers, the slender tube is rotated and positioned, preventing axial movement and radial runout. The two grinding heads 12 rotate at equal speeds in the same direction, but their rotation direction is opposite to that of the slender tube G. Each grinding head 12 can not only rotate around its own axis but also move along the axial direction.

[0057] The end-face grinding unit 2 includes a rolling frame wheel assembly 20, a pressure wheel assembly 21, and two grinding heads 22. The rolling frame wheel assembly 20 has the same structure as the rolling support wheel assembly 10. The pressure wheel assembly 21 includes a pressure wheel 210 aligned with the rolling frame wheel assembly 20 and a power unit 211 (using a conventional pneumatic cylinder, hydraulic cylinder, or electric cylinder, and guided by a corresponding slide rail) that drives the pressure wheel 210 to press down or disengage. The pressure wheel 210 and the two support wheels 200 of the rolling frame wheel assembly 20 are arranged in an equilateral triangle, with the center of the equilateral triangle coinciding with the center of the slender tube G. One of the pressure wheel 210 and / or the support wheel 200 is the driving wheel, and the others are driven wheels. In this case, there is no need to switch the pressure wheel position, so end-face grinding is performed based on two-point rotation positioning to keep the slender tube in a straight position. The two grinding heads 22 rotate at the same speed and in the same direction. At the same time, the rotation direction of the grinding heads 22 is opposite to the rotation direction of the slender tube G. Each grinding head 22 can not only rotate around its own axis, but also move along the axis.

[0058] The internal grinding unit 3 includes a rolling wheel assembly 30, a clamping wheel assembly 31, and two internal grinding heads 32. The rolling wheel assembly 30 has the same structure as the rolling support wheel assembly 10. The clamping wheel assembly 31 includes a clamping wheel 310 aligned with the rolling wheel assembly 30 and a power component 311 (using a conventional pneumatic cylinder, hydraulic cylinder, or electric cylinder, and guided by a corresponding slide rail) that drives the clamping wheel 310 to press down or disengage. The clamping wheel 310 and the two rollers 300 of the rolling wheel assembly 30 are arranged in an equilateral triangle, with the center of the equilateral triangle coinciding with the center of the slender tube G. One of the clamping wheel 310 and / or one of the rollers 300 is the driving wheel, and the others are driven wheels. In this case, there is no need to switch the position of the pressure rollers; therefore, internal grinding is performed based on two-point rotation positioning to keep the slender tube in a straight position. The two internal grinding heads 32 rotate at the same speed and in the same direction. At the same time, the rotation direction of the internal grinding heads 32 is opposite to the rotation direction of the slender tube G. Each internal grinding head 32 can not only rotate around its own axis, but also move along the axis.

[0059] Furthermore, the contour grinding, end face grinding, and inner hole grinding are arranged sequentially and alternately, and a traversing robot S is used with transfer grippers s1 corresponding to the three grinding areas. The transfer grippers s1 can simultaneously hold the slender tube G located in each grinding area, and continuous transfer of the grinding process can be achieved with a single shift. The traversing robot S quickly connects multiple grinding areas and more accurately completes the center-aligned rotational positioning of the slender tube.

[0060] In this example, the all-around polishing process includes the following sequential polishing steps:

[0061] S1, Contour Polishing

[0062] First, the slender tube G is freely rolled on a rolling support area formed by multiple rolling support wheel sets 10. These rolling support areas are aligned to form a bearing area, with the center of the bearing area aligned with the center of the slender tube G. Simultaneously, using the center of the bearing area as a reference, pressing wheel sets 11 are formed on opposite sides of the reference, capable of relative switching and rolling downwards onto the slender tube G. The pressing points formed by the pressing wheel sets 11 and the bearing area cooperate to form a positioning channel. The slender tube G is driven to rotate around its own axis within the positioning channel based on the pressing wheel sets 11 and the rolling support wheel sets 10. Second, based on the switching cooperation between the grinding heads 12 at the left and right ends of the slender tube G and the pressing points formed by the pressing wheel sets 11, left and right pressing points extending from the ends towards the center are respectively formed. The right grinding stroke overlaps with the left and right grinding strokes in the middle of the slender tube G. At the same time, the rotation direction of the grinding head 12 is opposite to that of the slender tube G. During the left grinding stroke, the left grinding head 12L moves to the middle of the slender tube G, and the right grinding head 12R contacts the right end of the slender tube G to form an axial dynamic balance assist. Then, the left grinding head 12L moves to the left to grind and reaches the left end of the slender tube G, and the remaining end stops grinding. At the same time, the pressure point of the pressure wheel group 11 is switched to implement the right grinding stroke. The right grinding head 12R moves to the middle of the slender tube G and moves to the right to grind. At this time, the left grinding head 12L forms an axial dynamic balance assist, and the left and right grinding strokes are completed synchronously while the left and right grinding heads move in opposite directions.

[0063] S2, End face grinding

[0064] The slender tube with the profile surface ground is transferred to the end face grinding area, and then grinding is performed by grinding heads at both ends synchronously, with the grinding heads and the slender tube rotating in opposite directions, to complete the end face grinding.

[0065] S3, Inner hole grinding

[0066] The slender tube with the end face ground is transferred to the inner hole grinding area. Then, the inner grinding heads at both ends are used to grind the inner hole of the slender tube synchronously with the inner grinding heads and the slender tube rotating in opposite directions. When the two inner grinding heads are close to each other, one continues to move forward while the other moves backward so that the grinding covers the entire inner hole. Then, the two inner grinding heads move out in the opposite direction to complete the inner hole grinding.

[0067] Furthermore, in step S1, rolling support is formed based on the double support wheels 100 to facilitate the rotation of the slender tube G. Axial dynamic balancing assistance is based on grinding contact or reverse movement to form opposing balancing forces, so that the slender tube G can be ground on the contour surface without axial displacement. Axial dynamic balancing further reduces axial movement of the slender tube during the grinding of the contour surface. The two grinding heads 12 rotate at equal speeds and in the same direction. Rotation is avoided to prevent axial movement of the slender tube. When the left grinding head 12L forms axial dynamic balancing assistance, the lateral movement speed of the left grinding head 12L is less than that of the right grinding head 12R, and the two keep synchronously disengaging from the slender tube. This also further avoids axial movement of the slender tube during contour surface grinding.

[0068] In step S2, circumferential rotation positioning is achieved using the rolling frame wheel assembly 20 and the positive pressure wheel assembly 21. This rotational positioning eliminates axial movement of the slender tube during end-face grinding. The grinding head 22 rotates in the same direction and at the same speed. This prevents axial movement of the slender tube from occurring during end-face grinding.

[0069] In step S3, circumferential rotational positioning is achieved using the rolling wheel set 30 and the clamping wheel set 31. This rotational positioning eliminates axial movement of the slender tube during internal grinding. The two internal grinding heads 32 rotate in the same direction, with equal grinding and movement speeds. This same speed and direction of rotation prevents torsion and uneven axial stress in the slender tube during synchronous grinding. The grinding areas formed during the counter-movements of the two internal grinding heads 32 overlap. This overlap ensures that the grinding area fully covers the entire inner hole of the slender tube.

[0070] In summary, after adopting this grinding process, firstly, the slender tube is freely rolled on a rolling support area formed by multiple rolling support wheel sets. These rolling support areas are aligned to form a bearing area, with the center of the bearing area aligned with the center of the slender tube. Simultaneously, using the center of the bearing area as a reference, pressure wheel sets are formed on opposite sides of the reference, capable of relative switching and rolling downwards onto the slender tube. The pressure points formed by the pressure wheel sets and the bearing area cooperate to form a positioning channel. The slender tube rotates around its own axis within the positioning channel based on the pressure wheel sets and / or the rolling support wheel sets. Next, the switching and cooperation of the grinding heads at the left and right ends of the slender tube and the pressure points formed by the pressure wheel sets respectively create left and right grinding strokes extending from the ends towards the middle, with the left and right grinding strokes overlapping in the middle of the slender tube. Alternatively, the grinding heads can be aligned and joined together, with the rotation direction of the grinding heads opposite to that of the slender tube. During the left grinding stroke, the left grinding head moves to the middle of the slender tube, while the right grinding head contacts the right end of the slender tube to provide axial dynamic balance. Then, the left grinding head moves to the left to grind until it reaches the left end of the slender tube, pausing grinding at the remaining end. Simultaneously, the pressure point of the pressure wheel group is switched to initiate the right grinding stroke. The right grinding head moves to the middle of the slender tube and grinds to the right. At this time, the left grinding head provides axial dynamic balance, and the left and right grinding strokes are completed synchronously as the left and right grinding heads move in opposite directions to complete the contour surface grinding. Next, the slender tube with the contour surface ground is transferred to the end face grinding area, and then grinding is performed synchronously by the grinding heads at both ends, with the grinding heads and the slender tube rotating in opposite directions. The end face grinding is completed. Finally, the slender tube with the end face ground is transferred to the inner hole grinding area. Then, two inner grinding heads are used simultaneously, with the inner grinding heads and the slender tube rotating in opposite directions, to grind the inner hole of the slender tube. When the two inner grinding heads are close to each other, one continues to move forward while the other moves backward so that the grinding covers the entire inner hole. Then, they move out in the opposite direction to complete the inner hole grinding. Therefore, compared with the prior art, this invention, on the one hand, forms a grinding stroke covering the entire slender tube based on the position switching of the pressure roller, and on the other hand, keeps the slender tube in an axial dynamic balance mode under the positioning of one rotation of the slender tube. It realizes that the contour surface is first ground in two steps and then synchronously. This not only achieves grinding of the contour surface of the slender tube without dead angles, but also maintains the consistency of the axial reference to carry out high-quality grinding without axial movement and without radial runout. On the other hand, based on the sequential grinding of the contour surface, end face, and inner hole of the slender tube, not only is the radial runout defect caused by the contour surface during inner hole grinding eliminated, but also the rotation center of the slender tube is further corrected based on the centering grinding of the end face, providing the necessary conditions for high-quality inner hole grinding, so as to complete the all-round grinding of the slender tube with high efficiency and yield. On the third aspect, the rolling support formed by the double support wheels is used to facilitate the rotation of the slender tube. One of the two support wheels is the driving wheel, and the other support wheel and the lower pressure wheel of the lower pressure wheel group are the follower wheels. At the same time, the two driving wheels are coaxial, so that a power motor can synchronously drive multiple driving wheel heads to rotate synchronously. In addition, there are two rolling support wheel groups, and the distance between the two rolling support wheel groups is 1 / 3 to 1 / 2 of the length of the slender tube.The simplest support is formed by using the principle of two points determining a straight line, and the distance layout can form better support based on the left and right grinding strokes to reduce the radial runout of slender tubes; fourthly, the switching of the wheel seat realizes the switching of the pressure wheel, and the pressure wheel with a staggered and overall triangular layout and two sets of support wheels form the rotational positioning of the slender tube, avoiding axial movement and radial runout of the slender tube; at the same time, axial dynamic balance further reduces the axial movement of the slender tube in the grinding profile surface; fifthly, the two grinding heads rotate at equal speeds and in the same direction to avoid axial movement of the slender tube caused by rotation; the left grinding head forms the shaft During dynamic balancing, the lateral movement speed of the left grinding head is less than that of the right grinding head, and both move out of the slender tube synchronously. This further avoids axial movement of the slender tube during contour grinding. Sixthly, a rolling frame wheel assembly and a positive pressure wheel assembly are used for circumferential rotation positioning. Based on rotation positioning, axial movement of the slender tube during end face grinding is eliminated. The rolling frame wheel assembly has the same structure as the rolling support wheel assembly. The positive pressure wheel assembly includes a positive pressure wheel aligned with the rolling frame wheel assembly and a power unit that drives the positive pressure wheel to press down or disengage. The positive pressure wheel and the two frame wheels of the rolling frame wheel assembly are distributed in an equilateral triangle, and the center of the equilateral triangle is aligned with the slender tube. With the centers coinciding and based on either the pressure roller or the support roller being the driving roller, and the others being driven rollers, there is no need to switch the pressure roller positions. A two-point rotational positioning method is used to keep the slender tube in a straight position during end-face grinding. Simultaneously, the grinding heads rotate in the same direction and at the same speed to avoid axial movement of the slender tube during end-face grinding. The seventh aspect uses a rolling roller group and a clamping roller group for circumferential rotational positioning. This rotational positioning eliminates axial movement of the slender tube during internal hole grinding. The rolling roller group has the same structure as the rolling support roller group, and the clamping roller group includes a clamping roller aligned with the rolling roller group, a drive clamping roller to press down, or... The detached power components, the two rollers of the clamping roller and rolling roller group are distributed in an equilateral triangle, and the center of the equilateral triangle coincides with the center of the slender tube. Based on the fact that one of the clamping roller and / or the roller is the driving roller and the others are driven rollers, at this time, there is no need to switch the position of the clamping roller. The two-point rotation positioning is directly adopted to keep the slender tube in a straight state for internal hole grinding. In the eighth aspect, the two internal grinding heads rotate in the same direction, and the grinding speed and the moving speed are equal. Based on the same speed and the same direction of rotation, the torsion of the slender tube and the unequal axial stress caused by synchronous grinding are avoided. At the same time, the grinding areas formed by the opposite movement of the two internal grinding heads overlap. The overlapping ensures that the grinding area fully covers the inner hole of the entire slender tube; the ninth aspect involves the sequential and alternating arrangement of contour grinding, end face grinding, and inner hole grinding, and the use of a transverse robot with transfer grippers corresponding to the three grinding areas. The transfer grippers can simultaneously hold the slender tube located in each grinding area, and the grinding process can be continuously transferred with a single shift. The transverse robot can quickly connect multiple grinding areas and more accurately complete the center-aligned rotational positioning of the slender tube.

[0071] The present invention has been described in detail above, with the aim of enabling those skilled in the art to understand and implement the invention. However, this description should not be construed as limiting the scope of protection of the invention. All equivalent changes or modifications made in accordance with the spirit and essence of the invention should be included within the scope of protection of the invention.

Claims

1. A profile, end face, bore all-around grinding process suitable for an elongated tube, characterized in that, It comprises the following polishing steps in turn: S1, profile polishing First, the elongated tube is freely rolled on the rolling support wheel groups to form a rolling area, and the rolling areas are aligned to form a bearing area, and the center of the bearing area is aligned with the center of the elongated tube, and at the same time, the center of the bearing area is taken as a reference to form a lower pressing wheel group on the opposite sides of the reference which can be switched and rolled downward on the elongated tube, wherein the lower pressing point formed by the lower pressing wheel group and the bearing area cooperates to form a positioning channel, and the elongated tube is driven to rotate around its axis in the positioning channel based on the lower pressing wheel group and / or the rolling support wheel group; Secondly, based on the switching cooperation of the polishing head at the left and right ends of the elongated tube and the lower pressing point formed by the lower pressing wheel group, left and right polishing strokes extending from the end to the middle are formed respectively, and the left and right polishing strokes overlap or align at the middle of the elongated tube, and the rotating direction of the polishing head is opposite to the rotating direction of the elongated tube, wherein when the left polishing stroke is grinding, the left polishing head moves to the middle of the elongated tube, the right polishing head contacts the right end of the elongated tube to form an axial dynamic balance auxiliary, then the left polishing head moves to the left to grind and reaches the left end of the elongated tube and the remaining end head pauses grinding, at the same time, the lower pressing point of the lower pressing wheel group is switched to implement the right polishing stroke, the right polishing head moves to the middle of the elongated tube and moves to the right to grind, at this time, the left polishing head forms an axial dynamic balance auxiliary, and in the synchronous complete left and right polishing strokes of the left and right polishing heads moving towards each other, wherein the axial dynamic balance auxiliary forms a balance force in the opposite direction based on the grinding contact or the reverse movement to make the elongated tube axially without displacement for profile grinding; and when the left polishing head forms an axial dynamic balance auxiliary, the transverse speed of the left polishing head is less than that of the right polishing head, and both keep synchronous and separate from the elongated tube; S2, end face polishing The two end grinding heads are synchronous, and the rotating direction of the grinding head and the elongated tube is opposite for grinding; S3, inner hole polishing Two end inner grinding heads are synchronous and enter the inner hole of the elongated tube for grinding, when the two inner grinding heads are close to each other, one continues to move forward and the other retreats to make the grinding cover the entire inner hole, and then moves out in the opposite direction.

2. The profile, end face, bore all-around grinding process for elongated tubes of claim 1, wherein, In step S1, each rolling support wheel group comprises two support wheels with parallel axes and relative spacing.

3. A profile, end face, bore all-around grinding process suitable for elongated tubes according to claim 2, characterized in that, One of the two support wheels is a driving wheel, and the other support wheel and the lower pressing wheel of the lower pressing wheel group are driven wheels; the plurality of driving wheels are coaxial.

4. A profile, end face, bore all-around grinding process for elongated tubes according to claim 1 or 2 or 3, characterized in that, There are two rolling support wheel groups, and the distance between the two rolling support wheel groups is 1 / 3~1 / 2 of the length of the elongated tube.

5. A profile, end face, bore all-around grinding process suitable for elongated tubes according to claim 4, characterized in that, The lower pressing wheel group comprises a frame seat, a left wheel seat and a right wheel seat movably installed on the frame seat, and a left lower pressing wheel and a right lower pressing wheel installed on the left wheel seat and the right wheel seat, wherein the left lower pressing wheel and the right lower pressing wheel are switched based on the movement of the left wheel seat and the right wheel seat to press one of the left lower pressing wheel and the right lower pressing wheel on the elongated tube.

6. A profile, end face, bore all-around grinding process suitable for elongated tubes according to claim 5, characterized in that, The left lower pressing wheel and the right lower pressing wheel are located between the two groups of rolling support wheels, and in the axial projection of the elongated pipe, one of the left lower pressing wheel and the right lower pressing wheel and the two support wheels of the group of rolling support wheels are tangent to the elongated pipe, and the centers of the pressing wheel and the support wheels are arranged in an equilateral triangle, wherein the center of the equilateral triangle coincides with the center of the elongated pipe; and / or the frame base comprises a base frame and a displacement frame, wherein the displacement frame is installed on the base frame and can move horizontally along the direction parallel to the axis of the pressing wheel, and the left wheel seat and the right wheel seat are respectively slidably installed on the displacement frame along the up-down direction.

7. A profile, end face, bore all-around grinding process suitable for elongated tubes according to claim 1, characterized in that, In step S1, the two polishing heads rotate at the same speed and in the same direction.

8. A profile, end face, bore all-around grinding process suitable for elongated tubes according to claim 1, characterized in that, In step S2, the rolling frame wheel group and the positive pressing wheel group are used for circumferential rotation positioning.

9. A profile, end face, bore all-around grinding process suitable for elongated tubes according to claim 8, characterized in that, The rolling frame wheel group and the rolling support wheel group are the same structure, the positive pressing wheel group comprises a positive pressing wheel aligned with the rolling frame wheel group, a power device driving the positive pressing wheel to press down or separate, the positive pressing wheel and the two frame wheels of the rolling frame wheel group are arranged in an equilateral triangle, and the center of the equilateral triangle coincides with the center of the elongated pipe, and based on any one of the positive pressing wheel and / or the frame wheel being a driving wheel, the others are driven wheels.

10. A profile, end face, bore all-around grinding process suitable for elongated tubes according to claim 1 characterized in that, In step S2, the grinding heads rotate in the same direction and at the same speed.

11. A profile, end face, bore all-around grinding process suitable for elongated tubes according to claim 1 characterized in that, In step S3, the rolling wheel group and the buckling wheel group are used for circumferential rotation positioning.

12. A profile, end face, bore all-around grinding process suitable for elongated tubes according to claim 11, characterized in that, The rolling wheel group and the rolling support wheel group are the same structure, the buckling wheel group comprises a buckling wheel aligned with the rolling wheel group, a power component driving the buckling wheel to press down or separate, the buckling wheel and the two rolling wheels of the rolling wheel group are arranged in an equilateral triangle, and the center of the equilateral triangle coincides with the center of the elongated pipe, and based on any one of the buckling wheel and / or the rolling wheel being a driving wheel, the others are driven wheels.

13. A profile, end face, bore all-around grinding process suitable for elongated tubes according to claim 1 characterized in that, In step S3, the two inner grinding heads rotate in the same direction, and the grinding speed and the moving speed are equal.

14. A profile, end face, bore all-around grinding process suitable for elongated tubes according to claim 1 characterized in that, In step S3, the grinding areas formed by the reverse movement of the two inner grinding heads overlap.

15. A profile, end face, bore all-around grinding process suitable for elongated tubes according to claim 1 characterized in that, The profile polishing, end face polishing and inner hole polishing are arranged in sequence and interval, and the transverse moving mechanical hand has moving and clamping jaws corresponding to the three polishing, wherein the moving and clamping jaws can simultaneously clamp the elongated pipes in each polishing area, and one displacement can realize the continuous transfer of the polishing process.

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