An auxiliary tool for centering the convex and concave die cavities of a cold heading machine

Abstract

The present invention discloses an auxiliary tool for centering the male and female cavities of a cold heading machine, comprising a die measuring sleeve, a punch measuring sleeve, a calibration sleeve, a displacement sensor, and a display mechanism. The die measuring sleeve comprises a first measuring sleeve and a second measuring sleeve; a plurality of measuring holes are provided on the side wall of the second measuring sleeve, the measuring holes being arranged along the radial direction of the second measuring sleeve, and the plurality of measuring holes being arranged in a ring shape along the axis of the second measuring sleeve; a displacement sensor is provided in each measuring hole, and the displacement sensor is connected to the display mechanism. The technical effects achieved are: the offset between the die cavity and the punch cavity can be intuitively observed using the display mechanism, thereby facilitating rapid adjustment of their concentricity; the concentricity of the male and female cavities of the cold heading machine can be adjusted simply, stably, and reliably during use; no traditional manual tools are required during the adjustment process, the operation is simple, the operator requirements are low, and the precise centering of the male and female cavities can be quickly achieved, with good results after actual application.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy automobile parts production, and in particular to an auxiliary tool for centering the male and female die cavities of a cold heading machine. Background Art

[0002] The production process of some parts for new energy vehicles requires the use of a cold heading machine. When the cold heading machine is in operation, the punch moves back and forth, and the die is stationary. The punch and die are installed in the punch cavity and die cavity respectively. During the cold heading production process, the punch cavity and the die cavity must be well aligned, and there must not be an eccentricity error of more than 0.1 mm. Therefore, during the operation of the cold heading machine, it is often necessary to calibrate the centering of the punch and die to ensure processing accuracy; in the prior art, the centering calibration work is done manually, and the operator manually adjusts the position of the punch cavity to achieve centering between the two. The commonly used tools are centering sleeves and feeler gauges, which are complicated to operate, very inefficient, and usually require experienced operators to complete. Summary of the Invention

[0003] To this end, the present invention provides an auxiliary tool for centering the male and female cavities of a cold heading machine to solve the above-mentioned problems in the prior art.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] According to a first aspect of the present invention, an auxiliary tool for centering the male and female cavities of a cold heading machine includes a female die measuring sleeve, a male die measuring sleeve, a calibration sleeve, a displacement sensor, and a display mechanism. The female die measuring sleeve includes a first measuring sleeve and a second measuring sleeve, both of which are cylindrical. The first measuring sleeve and the second measuring sleeve are coaxially arranged, and one end of the first measuring sleeve is connected to one end of the second measuring sleeve. A plurality of measuring holes are provided on a side wall of the second measuring sleeve, the measuring holes being arranged radially along the second measuring sleeve, and the plurality of measuring holes are respectively annularly arranged along the axis of the second measuring sleeve.

[0006] Each of the measuring holes is provided with a displacement sensor, and the displacement sensor is connected to the display mechanism;

[0007] The punch measuring sleeve includes a third measuring sleeve and a fourth measuring sleeve, both of which are cylindrical, the third measuring sleeve and the fourth measuring sleeve are coaxially arranged, and one end of the third measuring sleeve is connected to one end of the fourth measuring sleeve;

[0008] The calibration sleeve includes a first mounting sleeve and a second mounting sleeve, the first mounting sleeve and the second mounting sleeve are both cylindrical, the first mounting sleeve and the second mounting sleeve are coaxially arranged, and one end of the first mounting sleeve is connected to one end of the second mounting sleeve;

[0009] The outer diameter of the first measuring sleeve is adapted to the inner diameter of the die body, the inner diameter of the second measuring sleeve is adapted to the outer diameter of the fourth measuring sleeve, and the outer diameter of the third measuring sleeve is adapted to the inner diameter of the punch body; and the inner diameter of the first measuring sleeve is adapted to the outer diameter of the first mounting sleeve, and the inner diameter of the second measuring sleeve is adapted to the outer diameter of the second mounting sleeve.

[0010] Furthermore, the display mechanism includes a mounting base and a plurality of displays, wherein the plurality of displays are mounted on the mounting base, the displays are arranged in a one-to-one correspondence with the displacement sensors, and each displacement sensor is connected to one display.

[0011] Furthermore, the mounting seat includes a base and a mounting plate, the base is horizontally arranged, the mounting plate is inclined, and the bottom end of the mounting plate is connected to the base; the displacement sensor is arranged on the mounting plate.

[0012] Furthermore, the side wall of the second measuring sleeve is provided with four measuring holes, and the four measuring holes are respectively arranged in a circular array along the axis of the second measuring sleeve;

[0013] The display mechanism includes four displays, and the four displays are all arranged on the mounting plate.

[0014] Furthermore, a plurality of planes are provided on the outer side wall of the second measuring sleeve, and the planes are arranged in a one-to-one correspondence with the measuring holes, and each of the measuring holes is located in one of the planes.

[0015] Furthermore, the concentricity between the first measuring sleeve and the second measuring sleeve is less than 0.01 mm;

[0016] The concentricity between the third measuring sleeve and the fourth measuring sleeve is less than 0.01 mm;

[0017] The concentricity between the first mounting sleeve and the second mounting sleeve is less than 0.01 mm.

[0018] Furthermore, a die cavity is provided in the die body, and when the first measuring sleeve is inserted into the die cavity, a gap between an outer side wall of the first measuring sleeve and an inner side wall of the die cavity is less than 0.02 mm;

[0019] When the fourth measuring sleeve is inserted into the second measuring sleeve, the gap between the outer wall of the fourth measuring sleeve and the inner wall of the second measuring sleeve is less than 0.02 mm;

[0020] A punch cavity is provided in the punch body. When the third measuring sleeve is inserted into the punch cavity, the gap between the outer wall of the third measuring sleeve and the inner wall of the punch cavity is less than 0.02 mm.

[0021] Furthermore, after the first installation sleeve is inserted into the first measuring sleeve, a gap between an outer side wall of the first installation sleeve and an inner side wall of the first measuring sleeve is less than 0.02 mm;

[0022] After the second installation sleeve is inserted into the second measuring sleeve, a gap between the outer side wall of the second installation sleeve and the inner side wall of the second measuring sleeve is less than 0.02 mm.

[0023] Furthermore, the accuracy of the displacement sensor is 0.01 mm, and the measuring range of the displacement sensor is 5 mm.

[0024] Furthermore, the die measuring sleeve, the punch measuring sleeve and the calibration sleeve are all made of die steel.

[0025] The present invention has the following advantages: the die measuring sleeve, the punch measuring sleeve, the calibration sleeve, the displacement sensor and the display mechanism are used in conjunction with each other. During the centering process, the offset between the die cavity and the punch cavity can be visually observed using the display mechanism, thereby facilitating rapid adjustment of their concentricity. During use, the concentricity of the male and female die cavities of the cold heading machine can be simply, stably and reliably adjusted. No traditional manual tools are required during the adjustment process. The operation is simple, the requirements for the operator are low, the precise centering of the male and female die cavities can be quickly achieved, and good results are achieved after actual application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely illustrative, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0027] The structures, proportions, sizes, etc. illustrated in this specification are intended solely to complement the contents disclosed herein and to facilitate understanding and reading by persons skilled in the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall remain within the scope of the technical contents disclosed herein.

[0028] Figure 1 A first perspective view of an auxiliary tool for centering the male and female cavities of a cold heading machine provided in some embodiments of the present invention.

[0029] Figure 2 A second perspective view of an auxiliary tool for centering the male and female cavities of a cold heading machine provided in some embodiments of the present invention.

[0030] Figure 3 A cross-sectional view of an auxiliary tool for centering the male and female cavities of a cold heading machine provided in some embodiments of the present invention.

[0031] Figure 4 A schematic diagram of the overall structure of an auxiliary tool for centering the male and female cavities of a cold heading machine provided in some embodiments of the present invention when calibrated using a calibration sleeve.

[0032] Figure 5 A cross-sectional view of an auxiliary tool for centering the male and female cavities of a cold heading machine provided in some embodiments of the present invention when calibrated using a calibration sleeve.

[0033] Figure 6 Various views of a measuring bracket of an auxiliary tool for centering the male and female cavities of a cold heading machine provided in some embodiments of the present invention.

[0034] Figure 7 Various views of a die measuring sleeve of an auxiliary tool for centering the male and female cavities of a cold heading machine provided in some embodiments of the present invention.

[0035] Figure 8 Various views of a punch measuring sleeve of an auxiliary tool for centering the male and female cavities of a cold heading machine provided in some embodiments of the present invention.

[0036] Figure 9 Various views of a calibration sleeve of an auxiliary tool for centering the male and female die cavities of a cold heading machine provided in some embodiments of the present invention.

[0037] In the figure: 1. Die body, 2. Die measuring sleeve, 3. Displacement sensor, 4. Punch body, 5. Punch measuring sleeve, 6. Die cavity, 7. Punch cavity, 8. Calibration sleeve, 9. Base, 10. Mounting plate, 11. Display, 12. First measuring sleeve, 13. Second measuring sleeve, 14. First measuring cavity, 15. Second measuring cavity, 16. Measuring hole, 17. Third measuring sleeve, 18. Fourth measuring sleeve, 19. Third measuring cavity, 20. Fourth measuring cavity, 21. First mounting sleeve, 22. Second mounting sleeve, 23. First mounting cavity, 24. Second mounting cavity. DETAILED DESCRIPTION

[0038] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0039] Example 1

[0040] like Figures 1 to 9 As shown, an auxiliary tool for centering the male and female dies of a cold heading machine in an embodiment of the first aspect of the present invention includes a die measuring sleeve 2, a punch measuring sleeve 5, a calibration sleeve 8, a displacement sensor 3 and a display mechanism. The die measuring sleeve 2 is made of mold steel and includes a first measuring sleeve 12 and a second measuring sleeve 13. The first measuring sleeve 12 and the second measuring sleeve 13 are both cylindrical. The diameter of the first measuring sleeve 12 is smaller than the diameter of the second measuring sleeve 13. The first measuring sleeve 12 and the second measuring sleeve 13 are coaxially arranged. The concentricity between the first measuring sleeve 12 and the second measuring sleeve 13 is less than 0.01 mm. The first measuring sleeve 12 and the second measuring sleeve 13 are an integral structure. One end of the first measuring sleeve 12 is connected to one end of the second measuring sleeve 13. A plurality of measuring holes 16 are provided on the side wall of the second measuring sleeve 13. The measuring holes 16 are arranged along the radial direction of the second measuring sleeve 13, and the plurality of measuring holes 16 are respectively arranged in an annular shape along the axis of the second measuring sleeve 13.

[0041] Each measuring hole 16 is provided with a displacement sensor 3, which is connected to the display mechanism. The displacement sensor 3 is a contact digital sensor for precision measurement with an accuracy of 0.01mm and a measuring range of 5mm. The probe can be extended after contacting the object to be measured.

[0042] The punch measuring sleeve 5 is made of die steel and includes a third measuring sleeve 17 and a fourth measuring sleeve 18. The third measuring sleeve 17 and the fourth measuring sleeve 18 are both cylindrical. The diameter of the third measuring sleeve 17 is smaller than the diameter of the fourth measuring sleeve 18. The third measuring sleeve 17 and the fourth measuring sleeve 18 are coaxially arranged. The concentricity between the third measuring sleeve 17 and the fourth measuring sleeve 18 is less than 0.01 mm. The third measuring sleeve 17 and the fourth measuring sleeve 18 are an integral structure, and one end of the third measuring sleeve 17 is connected to one end of the fourth measuring sleeve 18.

[0043] The calibration sleeve 8 is made of die steel and includes a first mounting sleeve 21 and a second mounting sleeve 22. The first mounting sleeve 21 and the second mounting sleeve 22 are both cylindrical. The diameter of the first mounting sleeve 21 is smaller than the diameter of the second mounting sleeve 22. The first mounting sleeve 21 and the second mounting sleeve 22 are coaxially arranged. The concentricity between the first mounting sleeve 21 and the second mounting sleeve 22 is less than 0.01 mm. The first mounting sleeve 21 and the second mounting sleeve 22 are an integral structure, and one end of the first mounting sleeve 21 is connected to one end of the second mounting sleeve 22.

[0044] like Figure 2 and Figure 3 As shown, the outer diameter of the first measuring sleeve 12 is adapted to the inner diameter of the die body 1, and the first measuring sleeve 12 can be inserted into the die body 1; the inner diameter of the second measuring sleeve 13 is adapted to the outer diameter of the fourth measuring sleeve 18, and the fourth measuring sleeve 18 can be inserted into the second measuring sleeve 13; the outer diameter of the third measuring sleeve 17 is adapted to the inner diameter of the punch body 4, and the third measuring sleeve 17 can be inserted into the punch body 4; as shown Figure 4 and Figure 5 As shown, the inner diameter of the first measuring sleeve 12 is adapted to the outer diameter of the first mounting sleeve 21 , and the first mounting sleeve 21 can be inserted into the first measuring sleeve 12 ; the inner diameter of the second measuring sleeve 13 is adapted to the outer diameter of the second mounting sleeve 22 , and the second mounting sleeve 22 can be inserted into the second measuring sleeve 13 .

[0045] In this embodiment, it should be noted that the first measuring sleeve 12 and the second measuring sleeve 13 are respectively provided with a first measuring cavity 14 and a second measuring cavity 15, and the first measuring cavity 14 and the second measuring cavity 15 are interconnected; the third measuring sleeve 17 and the fourth measuring sleeve 18 are respectively provided with a third measuring cavity 19 and a fourth measuring cavity 20, and the third measuring cavity 19 and the fourth measuring cavity 20 are interconnected; the first mounting sleeve 21 and the second mounting sleeve 22 are respectively provided with a first mounting cavity 23 and a second mounting cavity 24, and the first mounting cavity 23 and the second mounting cavity 24 are interconnected; the first measuring cavity 14, the second measuring cavity 15, the third measuring cavity 19, the fourth measuring cavity 20, the first mounting cavity 23 and the second mounting cavity 24 are all cylindrical;

[0046] The die body 1 is provided with a die cavity 6. When the first measuring sleeve 12 is inserted into the die cavity 6, it can slide freely, and the gap between the outer wall of the first measuring sleeve 12 and the inner wall of the die cavity 6 is less than 0.02 mm.

[0047] When the fourth measuring sleeve 18 is inserted into the second measuring sleeve 13, it can slide freely, and the gap between the outer wall of the fourth measuring sleeve 18 and the inner wall of the second measuring sleeve 13 is less than 0.02 mm;

[0048] The punch body 4 is provided with a punch cavity 7. When the third measuring sleeve 17 is inserted into the punch cavity 7, it can slide freely, and the gap between the outer wall of the third measuring sleeve 17 and the inner wall of the punch cavity 7 is less than 0.02 mm.

[0049] After the first installation sleeve 21 is inserted into the first measuring sleeve 12, it can slide freely, and the gap between the outer wall of the first installation sleeve 21 and the inner wall of the first measuring sleeve 12 is less than 0.02 mm;

[0050] After the second installation sleeve 22 is inserted into the second measuring sleeve 13 , it can slide freely, and the gap between the outer wall of the second installation sleeve 22 and the inner wall of the second measuring sleeve 13 is less than 0.02 mm.

[0051] The technical effects achieved by this embodiment are as follows: the die measuring sleeve 2, the punch measuring sleeve 5, the calibration sleeve 8, the displacement sensor 3 and the display mechanism are used in conjunction with each other. During the centering process, the display mechanism can be used to intuitively observe the offset between the die cavity and the punch cavity, thereby facilitating rapid adjustment of their concentricity. During use, the concentricity of the male and female die cavities of the cold heading machine can be adjusted simply, stably and reliably. No traditional manual tools are required during the adjustment process. The operation is simple, the requirements for the operator are low, and the precise centering of the male and female die cavities can be achieved quickly. Good results are achieved after actual application.

[0052] Example 2

[0053] like Figures 1 to 9 As shown, this embodiment provides another auxiliary tool for centering the male and female cavities of a cold heading machine, the structure of which includes all the contents of embodiment 1, and only the different parts are described below.

[0054] In this embodiment, the display mechanism includes a mounting base and multiple displays 11. The multiple displays 11 are installed on the mounting base. The displays 11 are arranged in a one-to-one correspondence with the displacement sensors 3. Each displacement sensor 3 is connected to a display 11. The display 11 is used to display the readings of the displacement sensor 3 connected thereto.

[0055] In this embodiment, it should be noted that Figure 6 As shown, the mounting base includes a base 9 and a mounting plate 10. The base 9 is horizontally arranged, the mounting plate 10 is tilted, the bottom end of the mounting plate 10 is connected to the base 9, the angle between the mounting plate 10 and the base 9 is less than 90°, and the angle between the mounting plate 10 and the base 9 is preferably 30° to 60°. The display 11 is arranged on the upward side of the mounting plate 10; the base 9 is plate-shaped, the middle part of the base 9 is hollow, and the displacement sensor 3 is arranged on the mounting plate 10.

[0056] The technical effect achieved by this embodiment is: the entire display mechanism has a simple structure, the display 11 is set in a one-to-one correspondence with the displacement sensor 3, and can intuitively display the readings of the displacement sensor 3 at each position, thereby facilitating the orientation adjustment between the punch and the die during the centering operation, and then quickly and accurately completing the centering operation between the punch cavity and the die cavity.

[0057] Example 3

[0058] like Figures 1 to 9 As shown, this embodiment provides another auxiliary tool for centering the male and female cavities of a cold heading machine, the structure of which includes all the contents of Example 2, and only the different parts are described below.

[0059] In this embodiment, the measuring hole 16 is a circular hole. Four measuring holes 16 are provided on the side wall of the second measuring sleeve 13. The four measuring holes 16 are respectively arranged in a circular array along the axis of the second measuring sleeve 13.

[0060] The display mechanism includes four displays 11 . The four displays 11 are all arranged on the mounting plate 10 . The four displays 11 are symmetrically distributed in pairs in four directions: up, down, left, and right.

[0061] In this embodiment, it should be noted that Figure 1 、 Figure 2 、 Figure 4 and Figure 7 As shown, a plurality of planes are provided on the outer side wall of the second measuring sleeve 13 , and the planes are arranged in one-to-one correspondence with the measuring holes 16 , and each measuring hole 16 is located in a plane, so as to facilitate the installation of the displacement sensor 3 .

[0062] Furthermore, the usage and principle of the entire tool are as follows:

[0063] First, install the equipment, connect the cables, and debug the displacement sensors 3. Check and confirm that the four displacement sensors 3 correspond to the corresponding displays 11. Adjust the readings corresponding to the displacements in the extension directions of the probes of the four displacement sensors 3 to be positive.

[0064] Secondly, perform calibration work; insert the calibration sleeve 8 into the die measuring sleeve 2 and adjust it to the appropriate contact position, such as Figure 4 and Figure 5 As shown, at this moment, the four small displays 11 display readings, and the readings are set to zero;

[0065] Then, remove the calibration sleeve 8 and perform the centering work; slowly start the cold heading machine and move the punch body 4 away from the die body 1 to make room for the operation. After inserting the first measuring sleeve 12 of the die measuring sleeve 2 into the die cavity 6 and the third measuring sleeve 17 of the punch measuring sleeve 5 into the punch cavity 7, slowly start the cold heading machine and move the punch measuring sleeve 5 to the appropriate measurement position so that the fourth measuring sleeve 18 is inserted into the second measuring sleeve 13. At this time, read the reading of the display 11 on the mounting plate 10. If the display 11 reading in a certain direction is greater than zero, it means that there is a difference in the concentricity of the punch and die in this direction. It is necessary to repeatedly adjust the installation position of the punch cavity 7 to reduce this value to close to zero (less than 0.02mm). For example, if the upper display reads 0.8mm, the punch cavity needs to be moved upward. Repeat this process until the readings of the four small displays are close to zero (less than 0.02mm). At this point, the punch and die cavities maintain good concentricity and the centering work is completed.

[0066] The technical effect achieved by this embodiment is that the entire tool is easy to use and can be used to quickly, efficiently and accurately complete the alignment of the male and female mold cavities.

[0067] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications and improvements may be made thereto. Therefore, such modifications and improvements, without departing from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

[0068] The terms "upper", "lower", "left", "right", "middle", etc. used in this specification are only for the convenience of description and are not intended to limit the scope of the present invention. Changes or adjustments to their relative relationships should be regarded as within the scope of the present invention without substantially changing the technical content.

Claims

1. An auxiliary tool for centering the male and female cavities of a cold heading machine, characterized in that: The invention comprises a die measuring sleeve (2), a punch measuring sleeve (5), a calibration sleeve (8), a displacement sensor (3) and a display mechanism, wherein the die measuring sleeve (2) comprises a first measuring sleeve (12) and a second measuring sleeve (13), wherein the first measuring sleeve (12) and the second measuring sleeve (13) are both cylindrical, the first measuring sleeve (12) and the second measuring sleeve (13) are coaxially arranged, and one end of the first measuring sleeve (12) is connected to one end of the second measuring sleeve (13); a plurality of measuring holes (16) are provided on the side wall of the second measuring sleeve (13), wherein the measuring holes (16) are arranged along the radial direction of the second measuring sleeve (13), and the plurality of measuring holes (16) are respectively arranged in an annular shape along the axis of the second measuring sleeve (13); Each of the measuring holes (16) is provided with a displacement sensor (3), and the displacement sensor (3) is connected to the display mechanism; The punch measuring sleeve (5) includes a third measuring sleeve (17) and a fourth measuring sleeve (18), the third measuring sleeve (17) and the fourth measuring sleeve (18) are both cylindrical, the third measuring sleeve (17) and the fourth measuring sleeve (18) are coaxially arranged, and one end of the third measuring sleeve (17) is connected to one end of the fourth measuring sleeve (18); The calibration sleeve (8) comprises a first mounting sleeve (21) and a second mounting sleeve (22), the first mounting sleeve (21) and the second mounting sleeve (22) are both cylindrical, the first mounting sleeve (21) and the second mounting sleeve (22) are coaxially arranged, and one end of the first mounting sleeve (21) is connected to one end of the second mounting sleeve (22); The outer diameter of the first measuring sleeve (12) is adapted to the inner diameter of the die body (1), the inner diameter of the second measuring sleeve (13) is adapted to the outer diameter of the fourth measuring sleeve (18), and the outer diameter of the third measuring sleeve (17) is adapted to the inner diameter of the punch body (4); and the inner diameter of the first measuring sleeve (12) is adapted to the outer diameter of the first mounting sleeve (21), and the inner diameter of the second measuring sleeve (13) is adapted to the outer diameter of the second mounting sleeve (22); The display mechanism comprises a mounting seat and a plurality of displays (11), wherein the plurality of displays (11) are mounted on the mounting seat, the displays (11) are arranged in a one-to-one correspondence with the displacement sensors (3), and each displacement sensor (3) is connected to one display (11); A die cavity (6) is provided in the die body (1); when the first measuring sleeve (12) is inserted into the die cavity (6), a gap between an outer side wall of the first measuring sleeve (12) and an inner side wall of the die cavity (6) is less than 0.02 mm; When the fourth measuring sleeve (18) is inserted into the second measuring sleeve (13), a gap between an outer side wall of the fourth measuring sleeve (18) and an inner side wall of the second measuring sleeve (13) is less than 0.02 mm; A punch cavity (7) is provided in the punch body (4); when the third measuring sleeve (17) is inserted into the punch cavity (7), a gap between an outer wall of the third measuring sleeve (17) and an inner wall of the punch cavity (7) is less than 0.02 mm; After the first mounting sleeve (21) is inserted into the first measuring sleeve (12), a gap between an outer side wall of the first mounting sleeve (21) and an inner side wall of the first measuring sleeve (12) is less than 0.02 mm; After the second mounting sleeve (22) is inserted into the second measuring sleeve (13), a gap between an outer side wall of the second mounting sleeve (22) and an inner side wall of the second measuring sleeve (13) is less than 0.02 mm.

2. The auxiliary tool for centering the male and female cavities of a cold heading machine according to claim 1, characterized in that: The mounting seat comprises a base (9) and a mounting plate (10), wherein the base (9) is arranged horizontally, the mounting plate (10) is arranged obliquely, and the bottom end of the mounting plate (10) is connected to the base (9); and the displacement sensor (3) is arranged on the mounting plate (10).

3. The auxiliary tool for centering the male and female cavities of a cold heading machine according to claim 2, characterized in that: Four measuring holes (16) are provided on the side wall of the second measuring sleeve (13), and the four measuring holes (16) are respectively arranged in a circular array along the axis of the second measuring sleeve (13); The display mechanism comprises four displays (11), and the four displays (11) are all arranged on the mounting plate (10).

4. The auxiliary tool for centering the male and female cavities of a cold heading machine according to claim 1, characterized in that: A plurality of planes are provided on the outer side wall of the second measuring sleeve (13), and the planes are arranged in one-to-one correspondence with the measuring holes (16), and each measuring hole (16) is located in one of the planes.

5. The auxiliary tool for centering the male and female cavities of a cold heading machine according to claim 1, characterized in that: The concentricity between the first measuring sleeve (12) and the second measuring sleeve (13) is less than 0.01 mm; The concentricity between the third measuring sleeve (17) and the fourth measuring sleeve (18) is less than 0.01 mm; The concentricity between the first mounting sleeve (21) and the second mounting sleeve (22) is less than 0.01 mm.

6. The auxiliary tool for centering the male and female cavities of a cold heading machine according to claim 1, characterized in that: The accuracy of the displacement sensor (3) is 0.01 mm, and the measuring range of the displacement sensor (3) is 5 mm.

7. The auxiliary tool for centering the male and female cavities of a cold heading machine according to claim 1, characterized in that: The die measuring sleeve (2), the punch measuring sleeve (5) and the calibration sleeve (8) are all made of die steel.

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