Omnibearing grinding process suitable for outline, end face and inner hole of slender pipe

Abstract

The invention discloses an all-dimensional grinding process suitable for the outline, the end face and the inner hole of a slender pipe. The all-dimensional grinding process comprises the following grinding steps in sequence: S1, outline grinding; s2, end face polishing; and S3, inner hole polishing. On one hand, the grinding stroke covering the whole slender pipe is formed based on position switching of the pressing wheels, under one-time rotating positioning of the slender pipe, the slender pipe is kept in an axial dynamic balance mode, the contour surface is firstly ground step by step left and right and then ground synchronously, dead-corner-free grinding of the contour surface of the slender pipe is achieved, and the grinding efficiency is improved; the axis reference is kept consistent, and high-quality grinding without axial movement and radial run-out is implemented; and on the other hand, based on sequential grinding of the contour surface, the end surface and the inner hole of the slender pipe, the radial run-out defect caused by the contour surface in inner hole grinding is eliminated, and based on centering grinding of the end surface, the rotating center of the slender pipe is further corrected, necessary conditions are provided for high-quality inner hole grinding, and all-directional grinding of the slender pipe is completed efficiently with the yield.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of polishing machine, 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 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 part will form a restriction. Then, the profile polishing is divided into two steps. In the first step, half of the profile 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 profile polishing is completed from the other end to the positioning point. Therefore, the following technical defects exist. 1) In the profile polishing process, positioning needs to be performed twice, and the positioning points in the two times 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 waste rate is extremely high. At the same time, the whole operation process is very complicated, and the profile polishing efficiency is very low. 2) For 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 inner surface cannot be polished completely, and the probability of local transition grinding is large. Therefore, the final grinding quality is directly affected. SUMMARY

[0003] The present application aims at overcoming the defects in the prior art, and provides an improved profile, end face and inner hole all-around polishing process for an elongated pipe.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows. A profile, end face and inner hole all-around polishing process for an elongated pipe comprises the following polishing steps in sequence: S1, profile polishing Firstly, the elongated pipe is freely rolled and arranged on a plurality of rolling support wheel groups to form a rolling support area. The plurality of rolling support areas are aligned to form a bearing area, and the center of the bearing area is aligned with the center of the elongated pipe. Meanwhile, a lower pressing wheel group capable of being relatively switched and rolled and pressed on the elongated pipe is formed on the opposite sides of the reference, and the lower pressing point formed by the lower pressing wheel group cooperates with the bearing area to form a positioning channel. The elongated pipe is driven to rotate around the axis in the positioning channel based on the lower pressing wheel group and / or the rolling support wheel group. Secondly, the switching cooperation of the polishing head at the left and right ends of the elongated tube and the pressing point of the pressing wheel set forms left and right polishing strokes extending from the ends to the middle part, and the left and right polishing strokes overlap or align at the middle part of the elongated tube, and the rotation direction of the polishing head is opposite to the rotation direction of the elongated tube, wherein when the left polishing head moves to the middle part 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 left to grind and reaches the left end of the elongated tube, and the remaining end head pauses grinding, at the same time, the pressing point of the pressing wheel set is switched to implement the right polishing stroke, the right polishing head moves to the middle part of the elongated tube and moves right to grind, at this time, the left polishing head forms an axial dynamic balance auxiliary, and the left and right polishing strokes are completed synchronously during the movement of the left and right polishing heads. S2, end face polishing The two end grinding heads are synchronous, and the rotation direction of the grinding head is opposite to that of the elongated tube. S3, inner hole polishing The two end grinding heads are synchronous, and the rotation direction of the grinding head is opposite to that of the elongated tube.

[0005] Preferably, in step S1, each rolling support wheel set comprises two support wheels with parallel axes and relative spacing. Rolling support is formed based on the two support wheels to facilitate the rotation of the elongated tube.

[0006] 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 pressing wheel of the pressing wheel set are driven wheels. Based on one power, the rotation of the elongated tube can be implemented.

[0007] Preferably, the plurality of driving wheels are coaxial. In this way, one power motor can synchronously drive the plurality of driving wheels to rotate synchronously.

[0008] According to a specific implementation and preferred aspect of the present application, the rolling support wheel set has two, and the distance between the two rolling support wheel sets is 1 / 3-1 / 2 of the length of the elongated tube. The principle of two points determining a straight line is used to form the simplest support, and the distance layout can form better support based on the left and right polishing strokes to reduce the radial runout of the elongated tube.

[0009] Preferably, the pressing wheel set comprises a frame, a left wheel seat and a right wheel seat movably installed on the frame, and a left pressing wheel and a right pressing wheel installed on the left wheel seat and the right wheel seat, respectively, wherein the left pressing wheel and the right pressing wheel are switched based on the movement of the left wheel seat and the right wheel seat. In short, the switching of the pressing wheels is realized by the switching of the wheel seats.

[0010] In some embodiments, the left and right lower pressing wheels are located between the two sets of rolling support wheels, and in the axial projection of the elongated tube, one of the left and right lower pressing wheels and two support wheels of the set of rolling support wheels are tangent to the elongated tube, and the centers of the pressing wheel and the support wheels form an equilateral triangle, with the center of the equilateral triangle coinciding with the center of the elongated tube. The pressing wheels and the two sets of support wheels based on the staggered and overall triangular arrangement form the rotational positioning of the elongated tube, avoiding axial movement and radial jumping of the elongated tube.

[0011] Preferably, the frame includes 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 and right wheel seats are respectively slidably mounted on the displacement frame along the up-down direction.

[0012] 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 performed without axial displacement. The axial dynamic balance further reduces the axial movement of the elongated tube caused by the profile grinding.

[0013] Preferably, in step S1, the rotational speeds of the two polishing heads are equal and rotate in the same direction. Avoiding rotation causing axial movement of the elongated tube.

[0014] 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 are kept synchronized to leave the elongated tube. This also further avoids the axial movement of the elongated tube caused by the profile grinding.

[0015] 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.

[0016] In some embodiments, the rolling frame wheel set has the same structure as the rolling support wheel set, the positive pressing wheel set includes a positive pressing wheel aligned with the rolling frame wheel set, a power device driving the positive pressing wheel to press or leave, the positive pressing wheel and the two frame wheels of the rolling frame wheel set form an equilateral triangle, and the center of the equilateral triangle coincides with the center of the elongated tube, and based on any one of the positive pressing wheel and / or the frame wheel being a driving wheel, the others are driven wheels. At this time, without the need for pressing wheel position switching, two-point rotational positioning is directly used to keep the elongated tube in a straight state for end face grinding.

[0017] Preferably, in step S2, the grinding heads rotate in the same direction and at the same speed. Avoiding the axial movement of the elongated tube caused by the end face grinding.

[0018] According to still another specific implementation and preferred aspect of the present application, in step S3, the circumferential rotation positioning is performed by using the rolling wheel set and the clamping wheel set. Based on the rotation positioning, the axial movement of the elongated tube during the inner hole grinding is eliminated.

[0019] Preferably, the rolling wheel set has the same structure as the rolling support wheel set, the clamping wheel set includes the clamping wheel aligned with the rolling wheel set, the power component driving the clamping wheel to press down or to be separated, the clamping wheel and the two rolling wheels of the rolling wheel set are arranged in an equilateral triangle, the center of the equilateral triangle coincides with the center of the elongated tube, and based on any one of the clamping wheel and / or the rolling wheel being the driving wheel, the others are the driven wheels. In this case, the position of the pressing wheel does not need to be switched, and the two-point rotation positioning is directly used to keep the elongated tube in a straight state for the inner hole grinding.

[0020] Further, in step S3, the two inner 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 rotation, the torsion and the axial stress inequality of the elongated tube during the synchronous grinding are avoided.

[0021] Still further, in step S3, the polishing areas formed by the opposite movements of the two inner grinding heads are overlapped. Based on the overlapping, the grinding area is ensured to cover the entire inner hole of the elongated tube.

[0022] In addition, the profile polishing, the end face polishing and the inner hole polishing are sequentially and interval arranged, and the transverse moving mechanical hand has the corresponding moving and clamping jaws for the three polishing, wherein the moving and clamping jaws can simultaneously clamp the elongated tubes in the polishing areas, and one moving can realize the continuous transfer of the polishing process. The transverse moving mechanical hand quickly realizes the quick connection of the multiple grinding areas, and more accurately completes the center alignment rotation positioning of the elongated tube.

[0023] Due to the implementation of the above technical solutions, the present application has the following advantages compared with the prior art: In the existing all-around grinding of the elongated pipe, especially in the profile surface grinding process, not only two positioning is needed, but also the two positioning points cannot be the same, that is, the reference formed by the two-step grinding cannot be consistent, which causes the grinding precision to be unable to meet the requirements, resulting in a very high scrap rate. Meanwhile, the whole operation process is very complicated, and the profile surface grinding efficiency is very low. In addition, for profile surface grinding, end surface grinding and inner hole grinding, although they are completed independently, the sequence is very important. If the profile surface is not ground when the inner hole is ground, once the elongated pipe jumps radially due to the profile surface, at this time, the center line of the grinding head and the elongated pipe does not coincide, not only the overall grinding of the inner surface cannot be realized, but also the probability of local transitional grinding is larger, thus directly affecting the final grinding yield. The present application is an overall design for the profile, end surface and inner hole all-around grinding of the elongated pipe, which ingeniously solves the shortcomings and defects of the prior art. After adopting the grinding process, first, the elongated pipe is freely rolled and erected on the rolling support wheel groups to form a rolling support area. The rolling support areas are aligned to form a bearing area, and the center of the bearing area is aligned with the center of the elongated pipe. Meanwhile, 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 pipe. The lower pressing point formed by the lower pressing wheel group cooperates with the bearing area to form a positioning channel. The elongated pipe 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. Then, the switching cooperation of the lower pressing point formed by the lower pressing wheel group and the grinding head at the left and right ends of the elongated pipe respectively forms left and right grinding strokes extending from the end to the middle of the elongated pipe. The left and right grinding strokes overlap or align at the middle of the elongated pipe. Meanwhile, the rotation direction of the grinding head is opposite to that of the elongated pipe. When the left grinding stroke is ground, the left grinding head moves to the middle of the elongated pipe, and the right grinding head contacts the right end of the elongated pipe to form an axial dynamic balance auxiliary. Then, the left grinding head moves to the left to grind and stops grinding at the left end of the elongated pipe. Meanwhile, the lower pressing point of the lower pressing wheel group is switched to implement the right grinding stroke. The right grinding head moves to the middle of the elongated pipe and moves to the right to grind. At this time, the left grinding head forms an axial dynamic balance auxiliary. The left and right grinding strokes are synchronized during the movement of the left and right grinding heads to complete the profile surface grinding.Finally, the elongated tube after end face grinding is transferred to the inner hole grinding area, and then the two end inner grinding heads are synchronously entered into the inner hole grinding of the elongated tube with the inner grinding heads and the elongated tube rotating in opposite directions, when the two inner grinding heads are relatively close, one continues to move forward and the other retreats so as to make the grinding cover the entire inner hole, and then the grinding is moved out in the reverse direction to complete the inner hole grinding, therefore, compared with the prior art, the present application forms the grinding stroke covering the entire elongated tube based on the position switching of the pressure wheel, and keeps the elongated tube in the axial dynamic balance mode under the positioning of one rotation of the elongated tube, realizes the step-by-step left and right grinding of the profile surface and the synchronous grinding, not only realizes the dead angle-free grinding of the profile surface of the elongated tube, but also keeps the axis reference consistent to implement the high-quality grinding without axial movement and radial runout; on the other hand, the profile surface, end face and inner hole of the elongated tube are sequentially ground, not only eliminates the radial runout defect caused by the profile surface in the inner hole grinding, but also further corrects the rotation center of the elongated tube based on the centering grinding of the end face to provide necessary conditions for high-quality inner hole grinding, so as to complete the full-range grinding of the elongated tube with high efficiency and good yield. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Structure schematic diagram of the full-range grinding machine for the elongated tube of the present embodiment; Figure 2 Structure simplified schematic diagram of the present embodiment; Figure 1 Structure simplified schematic diagram of the present embodiment; Figure 3 Figure 2 Structure simplified schematic diagram of the present embodiment; Figure 4 Structure schematic diagram of the profile surface grinding unit in the present embodiment; Figure 3 Structure schematic diagram of the end face grinding unit in the present embodiment; Figure 5 Figure 3 Structure schematic diagram of the inner hole grinding unit in the present embodiment; Figure 6 Principle simplified schematic diagram of the profile surface grinding in the left grinding stroke in the present embodiment; Figure 3 Principle simplified schematic diagram of the profile surface grinding in the right grinding stroke in the present embodiment; Figure 7 Figure 3 Principle simplified schematic diagram of the end face grinding in the present embodiment; Figure 8 Principle simplified schematic diagram of the inner hole grinding in the present embodiment; Figure 3 Principle simplified schematic diagram of the inner hole grinding in the present embodiment; Figure 9 Figure 3 Principle simplified schematic diagram of the inner hole grinding in the present embodiment; Figure 10 Principle simplified schematic diagram of the inner hole grinding in the present embodiment; Figure 3 ​​​​​Wherein: 1, profile surface polishing unit; 10, rolling support wheel group; 100, support wheel; 101, power element; 11, lower pressing wheel group; 110, frame seat; a, bottom frame; b, displacement frame; 111, left wheel seat; 112, right wheel seat; 113, left lower pressing wheel; 114, right lower pressing wheel; 12, polishing head; 12L, left polishing head; 12R, right polishing head; 2, end surface polishing unit; 20, rolling frame wheel group; 200, frame wheel; 21, positive pressure wheel group; 210, positive pressure wheel; 211, power device; 22, grinding head; 3, inner hole polishing unit; 30, rolling wheel group; 300, rolling wheel; 31, buckling pressure wheel group; 310, buckling pressure wheel; 311, power component; 32, inner grinding head; G, elongated tube; S, transverse moving mechanical hand; s1, transloading clamping jaw. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application will be described in detail below in combination with the drawings and specific embodiments. In the following description, a lot of specific details are set forth in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can include at least one of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0028] In the present application, unless specifically defined otherwise, the terms "mounting", "connected", "connecting", "fixed", "fixing" and the like are used broadly and encompass both direct and indirect mounting, connecting, connecting, fixing and the like, and can further include fixed, detachable, or integral connection, mechanical or electrical connection, direct or indirect connection through an intermediate medium, internal communication between two elements, or interaction between two elements, unless specifically defined otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the second feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0030] It should be noted that when an element is referred to as "fixed" or "disposed" on another element, it can be directly on the other element or there can be a middle element. When an element is referred to as "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

[0031] As shown in Figures 1 to 10 The profile, end face and inner hole polishing process for the elongated pipe of the present embodiment adopts a full-range polishing device including a profile polishing unit 1, an end face polishing unit 2 and an inner hole polishing unit 3.

[0032] Specifically, the profile surface polishing unit 1 comprises two rolling support wheel sets 10, a pressing wheel set 11 and two polishing heads 12, wherein each rolling support wheel set 10 comprises two support wheels 100 parallel to each other and separated by a certain distance, and a power unit 101. The rolling support is formed based on the two support wheels 100 so as to facilitate the rotation of the elongated tube G. In this case, one of the two support wheels 100 is a driving wheel, and the other is a driven wheel (or a follower). The driving wheels of the two rolling support wheel sets 10 are connected by a synchronous shaft, and then driven by the power unit 101 (a conventional motor and a transmission belt). The distance between the two rolling support wheel sets 10 is 1 / 3~1 / 2 of the length of the elongated tube G. The two-point-determining-a-straight-line principle is adopted to form the simplest support, and the distance layout can form better support based on the left and right polishing strokes to reduce the radial runout of the elongated tube. The pressing wheel set 11 comprises a frame 110, a left wheel seat 111 and a right wheel seat 112 movably mounted on the frame 110, a left pressing wheel 113 and a right pressing wheel 114 mounted on the left wheel seat 111 and the right wheel seat 112 respectively, and a pressing power unit. The left wheel seat 111 and the right wheel seat 112 are switched based on the movement to press one of the left pressing wheel 113 and the right pressing wheel 114 on the elongated tube G, and both the left pressing wheel 113 and the right pressing wheel 114 are driven wheels (or followers). In short, the switching of the pressing wheels is realized by the switching of the wheel seats. The frame 110 comprises a base frame a and a displacement frame b, wherein the displacement frame b is installed on the base frame a and can move horizontally along the direction parallel to the axis of the pressing wheel, the left wheel seat 111 and the right wheel seat 112 are slidably installed on the displacement frame b along the vertical direction, and the pressing power unit is used to drive the horizontal movement of the frame 110 close to or away from the elongated tube G, and to drive the left wheel seat 111 or the right wheel seat 112 to move up and down to realize the pressing and releasing movements. A conventional air cylinder, hydraulic cylinder or electric cylinder is used for driving, and a corresponding slide rail is used for guiding. The left pressing wheel 113 and the right pressing wheel 114 are located between the two rolling support wheel sets 10, and in the axial projection of the elongated tube G, one of the left pressing wheel 113 and the right pressing wheel 114 and the two support wheels 100 of the rolling support wheel set 10 are tangent to the elongated tube G, and the centers of the pressing wheels and the support wheels 100 are arranged in an equilateral triangle, wherein the center of the equilateral triangle coincides with the center of the elongated tube G. The pressing wheels and the two sets of support wheels arranged in a staggered and triangular manner form the rotational positioning of the elongated tube, avoiding the axial movement and radial runout of the elongated tube. The two polishing heads 12 rotate at the same speed and in the same direction, and the rotating direction of the polishing heads 12 is opposite to the rotating direction of the elongated tube G. Each polishing head 12 can not only rotate around its own axis, but also move along the axial direction.

[0033] The end face polishing unit 2 comprises a rolling frame wheel set 20, a positive pressure wheel set 21, and two grinding heads 22, wherein the rolling frame wheel set 20 is the same in structure as the rolling support wheel set 10, the positive pressure wheel set 21 comprises a positive pressure wheel 210 aligned with the rolling frame wheel set 20, a power device 211 (driven by a conventional pneumatic cylinder or hydraulic cylinder or electric cylinder, and guided by a corresponding slide rail) for driving the positive pressure wheel 210 to press down or disengage, the positive pressure wheel 210 and two frame wheels 200 of the rolling frame wheel set 20 are arranged in an equilateral triangle, the center of the equilateral triangle coincides with the center of the elongated pipe G, and any one of the positive pressure wheel 210 and / or the frame wheel 200 is a driving wheel, and the others are driven wheels. At this time, the position of the pressure wheel does not need to be switched, so the two-point rotation positioning is adopted to keep the elongated pipe in a straight state for end face grinding. The two grinding heads 22 rotate at the same speed and in the same direction, the rotation direction of the grinding head 22 is opposite to the rotation direction of the elongated pipe G, and each grinding head 22 can not only rotate around its own axis, but also move along the axis direction.

[0034] The inner hole polishing unit 3 comprises a rolling wheel set 30, a buckling pressure wheel set 31, and two inner grinding heads 32, wherein the rolling wheel set 30 is the same in structure as the rolling support wheel set 10, the buckling pressure wheel set 31 comprises a buckling pressure wheel 310 aligned with the rolling wheel set 30, a power device 311 (driven by a conventional pneumatic cylinder or hydraulic cylinder or electric cylinder, and guided by a corresponding slide rail) for driving the buckling pressure wheel 310 to press down or disengage, the buckling pressure wheel 310 and two rolling wheels 300 of the rolling wheel set 30 are arranged in an equilateral triangle, the center of the equilateral triangle coincides with the center of the elongated pipe G, and any one of the buckling pressure wheel 310 and / or the rolling wheel 300 is a driving wheel, and the others are driven wheels. At this time, the position of the pressure wheel does not need to be switched, so the two-point rotation positioning is adopted to keep the elongated pipe in a straight state for inner hole grinding. The two inner grinding heads 32 rotate at the same speed and in the same direction, the rotation direction of the inner grinding head 32 is opposite to the rotation direction of the elongated pipe G, and each inner grinding head 32 can not only rotate around its own axis, but also move along the axis direction.

[0035] In addition, the profile polishing, end face polishing, and inner hole polishing are sequentially and spacedly arranged, and the transverse moving mechanical hand S has three corresponding transfer clamps s1 for polishing, wherein the transfer clamps s1 can simultaneously clamp the elongated pipes G in the polishing areas, and one-time displacement can realize continuous transfer of the polishing process. The transverse moving mechanical hand S quickly realizes rapid connection of multiple grinding areas, and more accurately completes the center alignment type rotation positioning of the elongated pipe.

[0036] In this example, the all-around polishing process comprises the following sequential polishing steps: S1, profile polishing Firstly, the elongated tube G is freely rolled on the rolling support wheel groups 10 to form rolling support areas, and the rolling support areas are aligned to form a bearing area, and the center of the bearing area is aligned with the center of the elongated tube G, and the center of the bearing area is taken as the reference, and the lower pressing wheel groups 11 are formed on the opposite sides of the reference and can be relatively switched and rolled and pressed on the elongated tube G, wherein the lower pressing point positions formed by the lower pressing wheel groups 11 and the bearing area cooperate to form a positioning channel, and the elongated tube G is driven to rotate around its own axis in the positioning channel based on the lower pressing wheel groups 11 and the rolling support wheel groups 10; secondly, based on the switching cooperation of the grinding heads 12 at the left and right ends of the elongated tube G and the lower pressing point positions formed by the lower pressing wheel groups 11, left and right grinding strokes extending from the end portions to the middle portion are respectively formed, and the left and right grinding strokes overlap in the middle portion of the elongated tube G, and the rotating direction of the grinding head 12 is opposite to the rotating direction of the elongated tube G, wherein when the left grinding stroke is ground, the left grinding head 12L moves to the middle portion of the elongated tube G, the right grinding head 12R contacts the right end of the elongated tube G to form an axial dynamic balance auxiliary, then the left grinding head 12L moves to the left to grind and reaches the left end of the elongated tube G and the remaining end head pauses grinding, and the lower pressing point positions of the lower pressing wheel groups 11 are switched to implement the right grinding stroke, the right grinding head 12R is shifted to the middle portion of the elongated tube G and moves to the right to grind, at this time the left grinding head 12L forms an axial dynamic balance auxiliary, and the left and right grinding strokes are completed synchronously during the relative movement of the left and right grinding heads; S2, end face grinding The elongated tube that completes the profile surface grinding is transferred to the end face grinding area, and then grinding is performed by using two end grinding heads synchronously and the rotating directions of the grinding heads and the elongated tube are opposite, so as to complete the end face grinding; S3, inner hole grinding The elongated tube that completes the end face grinding is transferred to the inner hole grinding area, and then two end inner grinding heads are used to grind the inner hole of the elongated tube, and the rotating directions of the inner grinding heads and the elongated tube are opposite, when the two inner grinding heads are relatively close, one continues to move forward and the other retreats so as to make the grinding cover the entire inner hole, and then the grinding heads are moved out in the opposite direction to complete the inner hole grinding.

[0037] Further, in step S1, the rolling support formed by the double support wheel 100 is used to facilitate the rotation of the elongated tube G. The axial dynamic balance auxiliary forms a balance force in the opposite direction based on the grinding contact or the reverse movement, so that the elongated tube G performs the profile surface grinding without axial displacement. Based on the axial dynamic balance, the axial movement of the elongated tube caused by the profile surface grinding is further reduced. The rotating speeds of the two grinding heads 12 are equal, and the rotating directions are the same. The axial movement of the elongated tube caused by the rotation is avoided. When the left grinding head 12L forms the axial dynamic balance auxiliary, the transverse movement speed of the left grinding head 12L is less than that of the right grinding head 12R, and the two are kept synchronous and separated from the elongated tube. This also further avoids the axial movement of the elongated tube caused by the profile surface grinding.

[0038] In step S2, the circumferential rotational positioning is performed by the rolling wheel set 20 and the positive pressure wheel set 21. Based on the rotational positioning, the axial movement of the elongated tube caused by the end face grinding is eliminated. The grinding head 22 rotates at the same speed and in the same direction. The axial movement of the elongated tube caused by the end face grinding is avoided.

[0039] In step S3, the circumferential rotational positioning is performed by the rolling wheel set 30 and the clamping wheel set 31. Based on the rotational positioning, the axial movement of the elongated tube caused by the inner hole grinding is eliminated. The two inner grinding heads 32 rotate in the same direction, and the grinding speed and the moving speed are equal. Based on the same speed and the same direction, the torsion and the axial stress inequality of the elongated tube caused by the synchronous grinding are avoided. The polishing areas formed by the reverse movement of the two inner grinding heads 32 overlap. Based on the overlap, the grinding area is ensured to cover the entire inner hole of the elongated tube.

[0040] In summary, after adopting the polishing process, first, the slender tube is freely rolled and erected on the rolling support wheel groups to form a rolling support area, the rolling support areas are aligned to form a bearing area, the center of the bearing area is aligned with the center of the slender 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 slender 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 slender 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; then, based on the polishing head at the left and right ends of the slender tube and the switching cooperation of 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, and the left and right polishing strokes overlap or align at the middle of the slender tube, and the rotating direction of the polishing head is opposite to the rotating direction of the slender tube, wherein when the left polishing head moves to the middle of the slender tube, the right polishing head contacts the right end of the slender tube to form an axial dynamic balance aid, then the left polishing head moves to the left end of the slender tube for grinding and the remaining end is paused for grinding, and 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 slender tube and moves to the right for grinding, at this time the left polishing head forms an axial dynamic balance aid, and the left and right polishing strokes are completed synchronously during the movement of the left and right polishing heads to complete the profile grinding; secondly, the slender tube after profile grinding is transferred to the end face grinding area, and then the two end grinding heads are used to grind synchronously and the rotating direction of the grinding head and the slender tube is opposite to complete the end face grinding; finally, the slender tube after end face grinding is transferred to the inner hole grinding area, and then the two end grinding heads are used to grind synchronously and the rotating direction of the grinding head and the slender tube is opposite to complete the inner hole grinding, when the two grinding heads are close to each other, one continues to move forward and the other retreats to cover the entire inner hole, and then moves out in the opposite direction to complete the inner hole grinding, therefore, compared with the prior art, on the one hand, based on the position switching of the pressing wheel, the grinding stroke covering the entire slender tube is formed, and the slender tube is kept in the axial dynamic balance mode during one rotation positioning, the profile is first polished left and right in steps and then polished synchronously, not only realizing the dead angle-free grinding of the profile of the slender tube, but also keeping the axis reference consistent to implement high-quality, axial movement-free and radial run-out-free grinding; on the other hand, based on the profile, end face and inner hole grinding of the slender tube in sequence, not only the radial run-out defect caused by the profile in the inner hole grinding is eliminated, but also the centering grinding of the end face further corrects the rotation center of the slender tube to provide necessary conditions for high-quality inner hole grinding, to complete the all-around grinding of the slender tube with high efficiency and good yield; thirdly, based on the rolling support formed by the double support wheels, the self-rotation of the slender tube is facilitated, one of the two support wheels is a driving wheel, the other support wheel and the pressing wheel of the pressing wheel group are driven wheels, and the two driving wheels are coaxial, so that one power motor can synchronously drive the multiple driving wheels to rotate synchronously, in addition, the rolling support wheel group has two, and the distance between the two rolling support wheel groups is 1 / 3-1 / 2 of the length of the slender tube.The simplest support is formed by the principle of two-point determining a straight line, and the layout of the distance can form better support based on the left and right polishing strokes to reduce the radial runout of the slender tube; the fourth aspect is the switching of the wheel seat to realize the switching of the pressure wheel, and the rotation positioning of the slender tube is formed by the pressure wheel and the two groups of support wheels based on the staggered and triangular overall layout to avoid the axial movement and radial runout of the slender tube; at the same time, the axial dynamic balance is further reduced to cause the axial movement of the slender tube in the grinding contour surface; the fifth aspect is that the rotating speeds of the two polishing heads are equal and rotate in the same direction to avoid the axial movement of the slender tube caused by rotation; when the left polishing head forms the axial dynamic balance auxiliary, the horizontal movement speed of the left polishing head is less than that of the right polishing head, and both keep synchronous and separate from the slender tube, which further avoids the axial movement of the slender tube caused in the contour grinding; the sixth aspect is that the rolling frame wheel group and the positive pressure wheel group are used for circumferential rotation positioning, and the axial movement of the slender tube caused in the end face grinding is eliminated based on the rotation positioning, wherein the rolling frame wheel group and the rolling support wheel group are the same structure, the positive pressure wheel group includes the positive pressure wheel aligned with the rolling frame wheel group, the power device driving the positive pressure wheel to press down or separate, the positive pressure wheel and the two frame wheels of the rolling frame wheel group are in equilateral triangle distribution, and the center of the equilateral triangle coincides with the center of the slender tube, and based on any one of the positive pressure wheel and / or the frame wheel being a driving wheel and the others being driven wheels, at this time, the position of the pressure wheel does not need to be switched, and the two-point rotation positioning is directly used to keep the slender tube in a straight state for end face grinding, at the same time, the grinding heads rotate in the same direction and at the same speed for grinding, avoiding the axial movement of the slender tube caused by end face grinding; the seventh aspect is that the rolling wheel group and the buckling pressure wheel group are used for circumferential rotation positioning, and the axial movement of the slender tube caused in the inner hole grinding is eliminated based on the rotation positioning, wherein the rolling wheel group and the rolling support wheel group are the same structure, the buckling pressure wheel group includes the buckling pressure wheel aligned with the rolling wheel group, the power component driving the buckling pressure wheel to press down or separate, the buckling pressure wheel and the two rollers of the rolling wheel group are in equilateral triangle distribution, and the center of the equilateral triangle coincides with the center of the slender tube, and based on any one of the buckling pressure wheel and / or the roller being a driving wheel and the others being driven wheels, at this time, the position of the pressure wheel does not need to be switched, and the two-point rotation positioning is directly used to keep the slender tube in a straight state for inner hole grinding, the eighth aspect is that the two inner grinding heads rotate in the same direction, and the grinding speed and movement speed are equal, based on the same speed and same direction rotation, avoiding the torsion and axial stress inequality of the slender tube caused in synchronous grinding, at the same time, the polishing areas formed by the reverse movement of the two inner grinding heads overlap. Based on the overlap, the grinding area ensures full coverage of the inner hole of the slender tube; the ninth aspect is that the contour polishing, end face polishing and inner hole polishing are sequentially and interval arranged, and the horizontal movement manipulator has moving and clamping jaws corresponding to the three polishing, wherein the moving and clamping jaws can clamp the slender tubes in the polishing areas at the same time, and one displacement can realize the continuous transfer of the polishing process, the horizontal movement manipulator quickly realizes the rapid connection of multiple grinding areas, and more accurately completes the center alignment type rotation positioning of the slender tube.

[0041] The above detailed description of the application is intended to be illustrative and not limiting. Other alternatives will be apparent to those of skill in the art without departing from the spirit of the present application.

Claims

1. A comprehensive grinding process for the contour, end face, and inner hole of slender tubes, characterized in that, It includes the following sequential polishing steps: S1, Contour Polishing First, the slender tube is freely rolled on a 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 a reference, a pressing wheel set is formed on opposite sides of the reference, which can be switched and rolled down on the slender tube. The pressing point formed by the pressing wheel set and the bearing area cooperate to form a positioning channel. The slender tube is driven to rotate around its own axis in the positioning channel based on the pressing wheel set and / or the rolling support wheel set. Secondly, based on the switching and cooperation of the pressing points formed by the grinding heads and pressing wheel sets at the left and right ends of the slender tube, left and right grinding strokes are formed respectively from the end to the middle. The left and right grinding strokes overlap or align in the middle of the slender tube. At the same time, the rotation direction of the grinding head is opposite to the rotation direction of the slender tube. When grinding in the left grinding stroke, the left grinding head moves to the middle of the slender tube, and the right grinding head contacts the right end of the slender tube to form axial dynamic balance assistance. Then the left grinding head moves to the left to grind and reaches the left end of the slender tube, and the remaining end is paused for grinding. At the same time, the pressing point of the pressing wheel set 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 axial dynamic balance assistance, and the left and right grinding strokes are completed synchronously in the opposite direction of the left and right grinding heads. S2, End face grinding Grinding is performed using two grinding heads that rotate synchronously at both ends, with the grinding heads and the slender tube rotating in opposite directions. S3, Inner hole grinding The grinding process involves two internal grinding heads moving synchronously into the inner hole of the slender tube, with the internal grinding heads and the slender tube rotating in opposite directions. When the two internal 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 grinding heads move out in the opposite direction.

2. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 1, characterized in that, In step S1, each set of rolling support wheels includes two support wheels with parallel axes and spaced apart from each other.

3. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 2, characterized in that, One of the two support wheels is the driving wheel, and the other support wheel and the pressure wheel of the pressure wheel assembly are the follower wheels; the multiple driving wheels are coaxial.

4. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 1, 2, or 3, characterized in that, There are two rolling support wheel sets, and the distance between the two rolling support wheel sets is 1 / 3 to 1 / 2 of the length of the slender tube.

5. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 4, characterized in that, The lower pressure roller assembly includes a frame, a left wheel seat and a right wheel seat that are respectively mounted on the frame for vertical movement, and a left lower pressure roller and a right lower pressure roller that are respectively mounted on the left wheel seat and the right wheel seat. The movement of the left wheel seat and the right wheel seat is switched so that one of the left lower pressure roller and the right lower pressure roller presses down on the slender tube.

6. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 5, characterized in that, The lower left and lower right pressure rollers are staggered between two rolling support roller groups. In the axial projection of the slender tube, one of the lower left and lower right pressure rollers and both support rollers of the rolling support roller group are tangent to the slender tube. The center of the pressure roller and the center of the support roller form an equilateral triangle, wherein the center of the equilateral triangle coincides with the center of the slender tube. And / or, the frame includes a base frame and a shifting frame, wherein the shifting frame is mounted on the base frame and can be moved laterally along a direction parallel to the axis of the pressure rollers. The left wheel seat and the right wheel seat are slidably mounted on the shifting frame along the vertical direction, respectively.

7. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 1, characterized in that, In the grinding process of step S1, the axial dynamic balancing aid is based on the grinding contact or reverse movement to form a balancing force in opposite directions, so that the contour surface of the slender tube can be ground without axial displacement.

8. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 1, characterized in that, In step S1, the two grinding heads rotate at the same speed and in the same direction; and / or, in step S1, when the left grinding head forms axial dynamic balance assistance, the lateral movement speed of the left grinding head is less than the lateral movement speed of the right grinding head, and the two keep synchronously disengaging from the slender tube.

9. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 1, characterized in that, In step S2, a rolling frame wheel set and a positive pressure wheel set are used for circumferential rotation positioning.

10. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 9, characterized in that, 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 coincides with the center of the slender tube. Furthermore, based on the fact that either the positive pressure wheel or the frame wheel is the driving wheel, the others are driven wheels.

11. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 1, characterized in that, In step S2, the grinding heads rotate in the same direction and at the same speed for grinding.

12. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 1, characterized in that, In step S3, a rolling wheel set and a clamping wheel set are used for circumferential rotation positioning.

13. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 12, characterized in that, The rolling wheel assembly has the same structure as the rolling support wheel assembly. The clamping wheel assembly includes a clamping wheel aligned with the rolling wheel assembly 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 assembly are distributed in an equilateral triangle, and the center of the equilateral triangle coincides with the center of the slender tube. Furthermore, one of the clamping wheel and / or rollers is the driving wheel, and the others are driven wheels.

14. The all-around grinding process for the contour, end face, and inner hole of slender 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; and / or, in step S3, the grinding areas formed by the opposite movements of the two inner grinding heads overlap.

15. The all-around grinding process for the contour, end face, and inner hole of slender tubes according to claim 1, characterized in that, The contour grinding, end face grinding, and inner hole grinding are arranged in sequence and spaced apart. A transverse robotic arm is used with transfer grippers corresponding to the three grinding processes. The transfer grippers can simultaneously hold the slender tubes located in each grinding area, and the grinding process can be continuously transferred in one shift.

Images