A positioning and scribing device and method for head stock waste

Abstract

This application relates to the field of pressure vessel manufacturing, and specifically discloses a positioning and scribing device and method for the remaining material of a head. The device includes: a bottom plate; a plurality of first adjustment units and a plurality of second adjustment units arranged on the bottom plate. Among them, the first adjustment units and the second adjustment units jointly receive and position the head to be scribed, and each of the first adjustment units and each of the second adjustment units are alternately arranged on the bottom plate. Through the positioning and scribing device and method for the remaining material of the head of this application, it can replace the original visual and other manual-dependent scribing of the remaining material at the edge of the head, and is applicable to heads formed by various methods.

Description

Technical Field

[0001] This application relates to the field of pressure vessel manufacturing, and specifically discloses a positioning and marking device and method for the surplus material of a head. Background Art

[0002] The head is a main pressure-bearing component in a pressure vessel, usually a standard elliptical head. The manufacturing method of the head is generally stamping (including cold stamping and hot stamping) or spinning forming with a steel plate. After forming, there is surplus material at the edge of the head, which needs to be marked and cut to meet the dimensions of the design drawing and the welding requirements with the cylinder. Since the formed head is elliptical in shape and has no obvious reference position, it is difficult to accurately mark the cutting position. Whether the surplus material is cut accurately directly affects the subsequent manufacturing quality of the pressure vessel.

[0003] For marking the surplus material at the edge of the formed head, currently, it is generally determined by visually observing the forming marks. This method has a large error and is greatly related to the experience and technical level of the operator. The published invention patent (application publication number: CN114210866 A) provides a method that can accurately mark the surplus material cutting line for the cold-stamped formed head, but it cannot mark the surplus material of the spun-formed head. For the hot-stamped formed head, according to the method published in "CN 114210866 A", it can only be carried out after natural cooling, and how to handle the deformation of the head after cooling and the possible displacement of the head itself is not mentioned in this method.

[0004] It can be seen that for how to mark and cut the surplus material at the edge of the formed head, it is difficult for the prior art to accurately determine the cutting position, which brings difficulties to the subsequent manufacturing of the pressure vessel or has potential risks in ensuring the quality of the pressure vessel. Relying entirely on the experience and technical level of the operator to ensure it will make the quality unstable, easily cause accidental quality problems, and the production efficiency is not high. The method provided by "CN 114210866A" can accurately mark the surplus material cutting line for the cold-stamped formed head, but it is difficult to implement for the spun-formed and hot-stamped formed heads. Therefore, how to accurately mark the surplus material cutting line for the heads formed by any method is an urgent problem to be improved in the prior art. Summary of the Invention

[0005] The reason why it is difficult to accurately mark the cutting line of the remaining material at the edge of the head lies in the elliptical shape of the head. When placed in its natural state, it is not easy to be "aligned" and fixed, and there is no obvious reference on itself. In view of the deficiencies of the prior art, the inventors of the present application designed a positioning and marking device for the remaining material of the head according to the structural characteristics of the elliptical head. Through this device, the head can be conveniently "aligned". By setting a movable positioning block on this device, the "vertex" of the head can be accurately determined, and thus, taking it as a reference, the total height can be measured, that is, a point on the remaining material line is determined. Move the head circumferentially, then "align" it again, and determine another point. In this way, multiple points are determined, and by connecting these points, the cutting line of the remaining material can be marked.

[0006] Specifically, according to one aspect of the present application, there is provided a positioning and marking device for the remaining material of a head, which includes: a bottom plate; a plurality of first adjusting units and a plurality of second adjusting units provided on the bottom plate, wherein the first adjusting units and the second adjusting units jointly receive and position the head to be marked, and each of the first adjusting units and each of the second adjusting units are alternately arranged on the bottom plate.

[0007] In an embodiment of the present application, the bottom plate includes a center point. Two adjacent first adjusting units are arranged at intervals of a first angle relative to the center of the circle within a circle centered on the center point, and two adjacent second adjusting units are arranged at intervals of a second angle relative to the center of the circle within the circle centered on the center point.

[0008] In an embodiment of the present application, both the first angle and the second angle are 120°.

[0009] In an embodiment of the present application, two adjacent first adjusting units and second adjusting units are arranged at intervals of 60° relative to the center of the circle.

[0010] In an embodiment of the present application, each first adjusting unit includes an inclined sliding seat provided on the bottom plate, a first measuring tool provided on the inclined sliding seat, a universal wheel movably provided on the inclined sliding seat, and a first stop member provided on the universal wheel.

[0011] In an embodiment of the present application, the inclined sliding seat includes an inclined surface disposed at an acute angle relative to the bottom plate, and the universal wheel is movably provided on the inclined surface.

[0012] In an embodiment of the present application, each second adjusting unit includes a smooth seat provided on the bottom plate, a second measuring tool provided on the smooth seat, a baffle movably provided on the smooth seat, and a second stop member provided on the baffle.

[0013] In an embodiment of the present application, the baffle includes a lower end engaged with the smooth seat and an upper end opposite to the lower end, and the upper end is used to abut against the head to be marked and is parallel to the straight section of the head to be marked.

[0014] In an embodiment of the present application, one of the second adjusting units further includes a positioning block movably disposed on the baffle, a third stopper disposed on the positioning block, and a third measuring tool disposed on the baffle. The positioning block is perpendicular to the baffle and can move in the vertical direction.

[0015] According to another aspect of the present application, there is provided a method for positioning and marking the remaining material of a head, the method being based on the head remaining material positioning and marking device as described above and including the following steps:

[0016] a. Install the first adjusting unit on the bottom plate;

[0017] b. Install other components of the second adjusting unit except the baffle including the positioning block on the bottom plate;

[0018] c. Place the head to be marked on the installed first adjusting unit and second adjusting unit, adjust the first adjusting unit and the second adjusting unit for the head to be marked, and install the baffle including the positioning block;

[0019] d. Move the first adjusting unit, the second adjusting unit, and the head to be marked to meet the predetermined "alignment" condition;

[0020] e. Move the positioning block to make it contact the bottom of the head to be marked, fix the positioning block, use the third measuring tool to determine the position where the remaining material line needs to be marked on the outer surface of the head to be marked, and mark this position on the outer surface of the head to be marked; and

[0021] f. Move the head to be marked circumferentially, repeat the above steps d and e to determine and mark multiple positions where the remaining material lines need to be marked, and connect the marked multiple positions to determine the remaining material cutting line.

[0022] Through the technical solution of the present application, at least the following technical effects can be achieved:

[0023] 1. By using the head remaining material positioning and marking device and method of the present application, it is possible to accurately mark the edge remaining material cutting line of the head made by various forming methods in the cold state, creating conditions for ensuring the production quality of subsequent pressure vessel products. Moreover, the head remaining material positioning and marking device described in the present application has a simple structure, is easy to manufacture, and is convenient to operate and use.

[0024] 2. By setting the universal wheels, it becomes easy to move the head to be marked on the head stock remaining material positioning and marking device of the present application, especially convenient for fine-tuning the position of the head, which is conducive to accurate "alignment".

[0025] 3. The setting of the sliding seat enables the positions of the universal wheels and the baffle to be adjustable, and a set of devices can mark the remaining material cutting lines for heads of various specifications.

[0026] 4. Measuring tools (such as fixed steel rulers) are set at different positions of the head stock remaining material positioning and marking device of the present application, which is convenient for reading, and there is no need to prepare additional measuring tools during the use of this device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The front view of the head stock remaining material positioning and marking device provided by the present application is shown;

[0028] Figure 2 Shows Figure 1 The top view of the head stock remaining material positioning and marking device shown;

[0029] Figure 3 The partial schematic diagram of the first adjustment unit is shown;

[0030] Figure 4 The partial schematic diagram of the second adjustment unit is shown;

[0031] Figure 5 Another partial schematic diagram of the second adjustment unit is shown; and

[0032] Figure 6 The installation operation flow chart of the head stock remaining material positioning and marking device provided by the present application is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] It should be understood that the embodiments of the present application shown in the exemplary embodiments are only illustrative. Although only a few embodiments are described in detail in the present application, those skilled in the art can easily understand that various modifications are feasible without substantially departing from the teachings of the subject matter of the present application. Accordingly, all such modifications should be included within the scope of the present application. Other substitutions, modifications, changes, and deletions can be made to the design, operating conditions, parameters, etc. of the following exemplary embodiments without departing from the gist of the present application.

[0034] According to the present application, a head stock remaining material positioning and marking device is provided, as Figure 1 and 2As shown, the positioning and scribing device for the headstock surplus material includes: a bottom plate 6; a plurality of first adjustment units A1 and a plurality of second adjustment units A2 arranged on the bottom plate 6. Among them, the first adjustment unit A1 and the second adjustment unit A2 jointly receive and position the headstock 1 to be scribed, and each first adjustment unit A1 and each second adjustment unit A2 are alternately arranged on the bottom plate 6.

[0035] In this application, the first adjustment unit A1 can achieve compensation in the radial direction of the headstock 1 to be scribed, for example, in order to adaptively receive and position headstocks 1 of different specifications. The second adjustment unit A2 can achieve adjustment in the radial direction of the headstock 1 to be scribed (for example, the horizontal direction shown in Figure 1 ), for example, in order to adaptively receive and position headstocks 1 of different specifications. The bottom plate 6 can be a plate member of any shape that plays a bearing role. For example, it can be a plate member of a regular shape such as a circle, a square, a rectangle, etc., or it can be a plate member of other irregular shapes. The bottom plate 6 includes a center point, which can be the position where the center of gravity of the bottom plate 6 is located, or the center point can be any point approximately located at the center position on the bottom plate 6. Two adjacent first adjustment units A1 can be arranged at a first angle relative to the center of the circle with the center point of the bottom plate 6 as the center of the circle within the circle, and two adjacent second adjustment units A2 can be arranged at a second angle relative to the center of the circle with the center point of the bottom plate 6 as the center of the circle within the circle.

[0036] In Figure 2 In the illustrated embodiment, the bottom plate 6 can be circular, and its center point is the center of the circle O. Three first adjustment units A1 and three second adjustment units A2 are shown in the figure. Two adjacent first adjustment units among the three first adjustment units A1 are arranged at a first angle (120°) relative to the center of the circle O within the circle with the center of the circle O as the center of the circle, and two adjacent second adjustment units among the three second adjustment units A2 are arranged at a second angle (120°) relative to the center of the circle O within the circle with the center of the circle O as the center of the circle. As Figure 2As shown, the first adjustment unit A1 has a proximal end close to the center O and a distal end extending away from the center O, and the second adjustment unit A2 also has a proximal end close to the center O and a distal end extending away from the center O. Among them, the distal end of the first adjustment unit A1 can define a first circumference, and the distal end of the second adjustment unit A2 can define a second circumference, and the circumference of the second circumference is greater than the circumference of the first circumference. Through such a setting method of the first adjustment unit A1 and the second adjustment unit A2, the adjacent first adjustment unit A1 and second adjustment unit A2 are alternately arranged at an interval of 60° relative to the center O. Those skilled in the art should understand that in other embodiments, the adjacent two first adjustment units A1 and / or the adjacent two second adjustment units A2 can have unequal angular intervals relative to the center O, and the adjacent first adjustment unit A1 and second adjustment unit A2 can be spaced apart at other angles relative to the center O. Such embodiments are also included within the scope of this application.

[0037] In Figure 1 it shows one of the first adjustment unit A1 and the second adjustment unit A2. In this application, the structures and sizes of each first adjustment unit A1 are substantially the same, and the structures and sizes of each second adjustment unit A2 are also substantially the same. As Figure 1 shown, the first adjustment unit A1 includes an inclined sliding seat 5 arranged on the bottom plate 6, a first measuring tool 4 arranged on the inclined sliding seat 5, a universal wheel 2 movably arranged on the inclined sliding seat 5, and a first stopper 3 arranged on the universal wheel. The inclined sliding seat 5 can be arranged on the bottom plate 6 in a commonly used manner in the art, for example, arranged on the bottom plate 6 through a slide rail, so as to realize the movement of the inclined sliding seat 5 on the bottom plate 6. In addition, a stopper for fixing the inclined sliding seat 5 can also be arranged on the bottom plate 6 to fix the inclined sliding seat 5 at the required position. Optionally, the inclined sliding seat 5 can also be directly placed at the desired position on the bottom plate 6 and fixed by a stopper. The inclined sliding seat 5 can include an inclined surface arranged at an acute angle relative to the bottom plate 6, and the universal wheel 2 is movably arranged on the inclined surface. In one embodiment, this acute angle can be 13°. However, in other embodiments, other acute angles can be set as needed.

[0038] Further referring to Figure 3, the inclined surface of the inclined sliding seat 5 may include a protrusion 14. The universal wheel 2 may have a "fork-shaped" structure that can "ride" on the protrusion 14 and slide along it. The first measuring tool 4 may be provided on the side surface of the inclined sliding seat 5, extending along the sliding direction of the universal wheel 2, and the first measuring tool 4 is located below the universal wheel 2, so that the reading on the first measuring tool 4 can be viewed without affecting the movement of the universal wheel 2. A lubricating coating, such as a carbon-based solid lubricating coating and a carbon-based material lubricating coating, may be included on the engaging surface between the "fork-shaped" structure of the universal wheel 2 and the protrusion 14 to facilitate sliding between the two. When the universal wheel 2 slides to the desired position, the universal wheel 2 can be fixed to the inclined sliding seat 5 by the first stopper 3. In another embodiment, the inclined surface of the inclined sliding seat 5 and the universal wheel 2 may be of other shapes, and the universal wheel 2 may be provided on the inclined surface of the inclined sliding seat 5 through, for example, slide rails. The two slide rails may be respectively located at the two edges of the inclined surface, and the first measuring tool 4 may be provided in the middle of the two edges of the inclined surface. The advantage of mounting the universal wheel 2 on the inclined sliding seat 5 is that when used for scribing the surplus material line of a large-diameter head, the universal wheel 2 moves outward, and the head itself does not rise too much, which is more convenient for operation. In an embodiment of the present application, the measuring tool (for example, the first measuring tool and the second and third measuring tools described below) may be a steel ruler, and the stopper (for example, the first stopper and the second and third stoppers described below) may be a set screw. In other embodiments, the measuring tool may also be other measuring tools such as a steel tape measure, and the stopper may also be other components for stopping such as a pin.

[0039] Return to Figure 1 , the second adjusting unit A2 may include a smooth seat 7 provided on the bottom plate 6, a second measuring tool 8 provided on the smooth seat 7, a baffle 10 movably provided on the smooth seat 7, and a second stopper 12 provided on the baffle 10. Similar to the inclined sliding seat 5, the smooth seat 7 may also be movably provided on the bottom plate 6, or may be placed and fixed at the required position.

[0040] Further refer to Figure 4, the smooth seat 7 may include a protrusion 15, and the lower end of the baffle 10 may have a "fork-shaped" structure which can "ride" on the protrusion 15 and slide along it. The second measuring tool 8 may be provided on the side of the smooth seat 7 and extend along the sliding direction of the baffle 10, and the second measuring tool 8 may be arranged above and below the baffle 10 in a manner similar to the cursor in a vernier caliper, so that the reading on the second measuring tool 8 can be viewed without affecting the movement of the baffle 10. Alternatively, the second measuring tool 8 may be provided only below the baffle 10. In addition, a lubricating coating, such as a carbon-based solid lubricating coating and a carbon-based material lubricating coating, may be included on the engaging surface between the "fork-shaped" structure of the baffle 10 and the protrusion 15 to facilitate the sliding therebetween. When the baffle 10 slides to the desired position, the baffle 10 can be fixed to the smooth seat 7 by the second stopper 12. In another embodiment, the baffle 10 and the smooth seat 7 may have different shapes, and the baffle 10 may be slidably arranged on the smooth seat 7 through a slide rail to achieve the movement of the baffle 10 in the horizontal direction. The upper end of the baffle 10 is used to abut against the head to be scribed 1 and may be parallel to the straight section of the head to be scribed 1.

[0041] To more conveniently position the head to be scribed 1, a positioning block 13 connected to the baffle 10 and a third stopper 12 provided on the positioning block 13 may be added to one of the second adjustment units A2, as Figure 1 shown. The positioning block 13 may be perpendicular to the baffle 10 and capable of moving in the vertical direction. When the positioning block 13 moves to the desired position, the position can be fixed by the third stopper 12. In addition, a third measuring tool 11 may be provided on the baffle 10, and the third measuring tool 11 may be fixed on the side wall of the baffle 10 to determine the position where the surplus material line needs to be scribed on the outer surface of the head to be scribed 1 and mark the position.

[0042] Further referring to Figure 5 , which shows a top view of the baffle 10 and the positioning block 13. As Figure 5 shown, the baffle 10 may include a protrusion 16 which can form a sliding surface for the positioning block 13, such that the positioning block 13 can be sleeved on the protrusion 16 and slide. The third measuring tool 11 may be arranged on the baffle 10 along the sliding direction of the positioning block 13. When the positioning block 13 slides to the desired position, the positioning block 13 can be fixed to the baffle 10 by the third stopper 12.

[0043] Based on referring to Figure 1 and Figure 2 , further referring to Figure 6 , which shows an installation operation flow chart of the head surplus material positioning and scribing device provided in the present application. Specifically, the installation operation process includes the following steps:

[0044] a. Install the first adjustment unit A1 on the bottom plate;

[0045] b. Install other components of the second adjustment unit A2 on the bottom plate except for the baffle including the positioning block 13;

[0046] c. Place the head to be marked 1 on the installed first adjustment unit A1 and second adjustment unit A2, adjust the first adjustment unit A1 and second adjustment unit A2 for the head to be marked 1, and install the baffle including the positioning block 13;

[0047] d. Move the first adjustment unit A1, the second adjustment unit A2, and the head to be marked 1 to meet the predetermined "alignment" condition;

[0048] e. Move the positioning block 13 so that it contacts the bottom of the head to be marked 1, fix the positioning block 13, use the third measuring tool 11 to determine the position where the surplus material line needs to be marked on the outer surface of the head to be marked 1, and mark this position on the outer surface of the head to be marked 1; and

[0049] f. Move the head to be marked 1 circumferentially, repeat the above steps d and e to determine and mark multiple positions where the surplus material line needs to be marked, and connect the marked multiple positions to determine the surplus material cutting line.

[0050] In an embodiment of the present application, in the above steps a and b, three first adjusting units A1 can be installed, and two adjacent first adjusting units can be arranged at the same angular interval relative to the center of the circle O. Similarly, three second adjusting units A2 can be installed, and two adjacent second adjusting units can be arranged at the same angular interval relative to the center of the circle O. In addition, the inclined sliding seat 5 of the first adjusting unit and the smooth seat 7 of the second adjusting unit can be stagger-mounted on the bottom plate 6 at an interval of 60° relative to the center of the circle O. Specifically, the three inclined sliding seats 5 are arranged in a centrosymmetric manner with the center of the bottom plate 6 as the center, and are evenly distributed circumferentially at 120°. A steel ruler is fixed on each inclined sliding seat 5 to ensure that the universal wheels 2 can be installed at the same position on the inclined sliding seat 5, and to ensure that the three universal wheels 2 can also be arranged in a centrosymmetric manner with the center of the bottom plate 6 as the center. The inclination angle of the inclined sliding seat 5 is preferably about 13° with respect to the horizontal line. The universal wheel 2 can move on the inclined sliding seat 5 and is fixed on the inclined sliding seat 5 by a set screw to adapt to the head 1 to be marked with lines of different specifications. The smooth seat 7 is fixed on the bottom plate 6, and the three smooth seats 7 are arranged in a centrosymmetric manner with the center of the bottom plate 6 as the center, and are evenly distributed circumferentially at 120°. A steel ruler is fixed on each smooth seat 7 to ensure that the three baffles on the smooth seat 7 are installed at the same position on the smooth seat, and to ensure that the three baffles can also be arranged in a centrosymmetric manner with the center of the bottom plate 6 as the center. Each baffle 10 is installed on the smooth seat 7, can move on the smooth seat 7, and is fixed by a set screw. The positioning block 13 is only installed on one of the baffles, can move up and down, and is fixed by a set screw.

[0051] In step b, install other components except the baffle with the positioning plate 13 according to the above requirements. The two baffles without the positioning plate are installed at a position with the center of the bottom plate 6 as the center of the circle and a diameter slightly larger than the outer diameter of the head 1 to be marked with lines.

[0052] In step c, place the head 1 to be marked with lines on the universal wheels 2 in the manner shown in Figure 1 and Figure 2 , move the head 1 to be marked with lines so that the straight section of the head 1 to be marked with lines is basically the same as the distance between the two baffles, and then install the other baffle with the positioning block 13.

[0053] In step d, move the head 1 to be marked with lines and the three baffles so that the three baffles are all in line with the straight section of the head 1 to be marked with lines, and the three baffles are on the same circle with the center of the bottom plate as the center of the circle (which can be determined by the reading of the steel ruler set on the smooth seat), and fix the baffles by set screws. At this time, the head 1 to be marked with lines is "aligned", that is, the predetermined "alignment" condition is satisfied.

[0054] In step e, move the positioning block 13 on the baffle upwards so that it contacts the head 1 to be marked. Specifically, it contacts the bottom of the head 1 to be marked, and the positioning block is fixed by a set screw. At this time, the position where the surplus material line needs to be marked can be determined by the steel ruler on the baffle, and a point is traced on the outer surface of the head.

[0055] In step f, move the head 1 to be marked circumferentially. According to the above steps d and e, "align" again and determine another point. Determine multiple points in this way and connect them to draw the surplus material cutting line.

[0056] Through the head surplus material positioning and marking device and method described in this application, the original visual and other manual-dependent marking of the head edge surplus material can be replaced, and it is applicable to the heads formed by various methods. Specifically, it can realize marking accurate edge surplus material cutting lines for the heads made by various forming methods in the cold state, creating conditions for ensuring the production quality of subsequent pressure vessel products. Moreover, the structure of this device is simple, easy to manufacture, and convenient to operate and use. The setting of the universal wheels makes it easy to move the head to be marked on this device, especially convenient for fine-tuning the position of the head, which is beneficial to accurate "alignment". The setting of the sliding seat makes the positions of the universal wheels and the baffle adjustable, and a set of devices can mark the surplus material cutting lines for heads of various specifications. In addition, fixing the steel ruler at different positions of the device can facilitate reading, and there is no need to prepare measuring tools during the use of this device.

[0057] The above are only the preferred embodiments of this application, and are not used to limit the scope of implementation of this application; if this application is modified or equivalently replaced without departing from the spirit and scope of this application, it should be covered by the protection scope of the claims of this application.

Claims

1. A positioning and scribing device for the remaining material of a head, characterized in that, Comprising: Bottom plate; A plurality of first adjusting units and a plurality of second adjusting units disposed on the bottom plate, wherein the first adjusting units and the second adjusting units jointly receive and position the head to be marked, and each of the first adjusting units and each of the second adjusting units are alternately disposed on the bottom plate. Wherein each of the first adjusting units includes an inclined sliding seat disposed on the bottom plate, a first measuring tool disposed on the inclined sliding seat, a universal wheel movably disposed on the inclined sliding seat, and a first stopper disposed on the universal wheel.

2. The positioning and marking device for the remaining material of the head according to claim 1, wherein The bottom plate includes a center point, and two adjacent first adjusting units are disposed at a first angle interval relative to the center of the circle within a circle centered on the center point, and two adjacent second adjusting units are disposed at a second angle interval relative to the center of the circle within the circle centered on the center point.

3. The positioning and marking device for the remaining material of the head according to claim 2, wherein, Both the first angle and the second angle are 120°.

4. The positioning and marking device for the headstock surplus material according to claim 3, characterized in that, The adjacent first adjusting unit and the second adjusting unit are disposed at an interval of 60° relative to the center of the circle.

5. The positioning and marking device for the remaining material of the head as claimed in claim 1, wherein, The inclined sliding seat includes an inclined surface disposed at an acute angle relative to the bottom plate, and the universal wheel is movably disposed on the inclined surface.

6. The positioning and scribing device for the headstock surplus material according to claim 1, characterized in that, Each of the second adjusting units includes a smooth seat disposed on the bottom plate, a second measuring tool disposed on the smooth seat, a baffle movably disposed on the smooth seat, and a second stopper disposed on the baffle.

7. The positioning and marking device for the remaining material of the head according to claim 6, characterized in that, The baffle includes a lower end engaged with the smooth seat and an upper end opposite to the lower end, and the upper end is used to abut against the head to be marked and is parallel to the straight section of the head to be marked.

8. The positioning and scribing device for the remaining material of the head according to claim 7, wherein One of the second adjusting units further includes a positioning block movably disposed on the baffle, a third stopper disposed on the positioning block, and a third measuring tool disposed on the baffle, and the positioning block is perpendicular to the baffle and can move in the vertical direction.

9. A method for positioning and scribing the surplus material of a head, characterized in that, The method is based on the head stock positioning and marking device according to any one of the preceding claims 1-8 and includes the following steps: a. Install the first adjusting unit on the bottom plate; b. Install other components of the second adjusting unit except the baffle including the positioning block on the bottom plate; c. Place the head to be marked on the installed first adjusting unit and second adjusting unit, adjust the first adjusting unit and the second adjusting unit for the head to be marked, and install the baffle including the positioning block; d. Move the first adjusting unit, the second adjusting unit and the head to be marked to meet the predetermined "alignment" condition; e. Move the positioning block so that it contacts the bottom of the head to be marked, fix the positioning block, use the third measuring tool to determine the position where the waste material line needs to be marked on the outer surface of the head to be marked, and mark this position on the outer surface of the head to be marked; and f. Move the head to be marked circumferentially, repeat steps d and e to determine and mark multiple positions where the waste material lines need to be marked, and connect the marked multiple positions to determine the waste material cutting line.

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