Half-section type thin-wall sleeve trepanning tool and using method

Abstract

The invention discloses a half-section type thin-wall sleeve trepanning tool and a using method. The half-section type thin-wall sleeve trepanning tool comprises a profiling body, a tensioning body and a pressing body. The profiling body is a base of the whole tool and is used for internally supporting and positioning a workpiece; the tensioning body is installed on the inner wall of the profiling body and used for tensioning a workpiece and fixing the shape of the workpiece. The pressing body is installed on the outer wall of the profiling body and used for conducting local shape righting and pressing on the workpiece. The problems that a workpiece is not attached to the surface of a tool, the hole forming position precision is low and the tool interferes with equipment in the hole forming machining process of the half-section type thin-wall sleeve are solved, the tensioning distance is shortened, local bulging is avoided, the hole forming position precision and the machining efficiency are improved, and the percent of pass of products is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of thin-walled parts processing, and in particular relates to a half-cut thin-walled sleeve hole opening tool and a use method thereof. Background Art

[0002] The semi-cut thin-walled sleeve is an important part of the solid engine. Its structure is a deformable thin-walled cylinder with a cutting seam in the middle and various avoidance holes and installation holes on the circumference. Its function is to protect its internal components and maintain the external streamline of the engine to reduce the resistance during flight. In order to ensure that there is no structural failure when the engine is working, the semi-cut thin-walled sleeve is made of ultra-high strength steel. The processing process is to first force spin forming, vacuum gas quenching and wire cutting to process the shape and cutting seam of the part, and then use a machining center or laser cutting and other punching equipment to process the holes on the surface. During installation, it is unfolded from the cutting seam and wrapped on the surface of the bracket, and connected with screws.

[0003] At present, the commonly used tooling for positioning the opening of a semi-sectioned thin-walled sleeve is to set two positioning holes on one side of the cut seam as a circumferential reference after the two ends are partially supported internally, and the other side of the cut seam is tightened on the outside of the part to fix the shape of the workpiece. Due to the influence of the inner diameter deviation and roundness of the workpiece after spinning and heat treatment, and the long tensioning distance, the part will have problems such as local bulging and non-fitting on the positioning surface and difficulty in tightening the other side of the cut seam, resulting in errors in the hole position and asymmetry relative to the cut seam. All hole positions must be aligned during assembly, so a single hole position deviation will cause the part to be unable to be assembled and scrapped. In addition, tightening the outside of the part will interfere with the punching equipment, resulting in the need to perform the hole opening in multiple processes, affecting processing efficiency and stability. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a half-cut thin-wall sleeve hole opening tool and a method of use, which solves the problems of local bulge non-fitting, poor hole position accuracy and low processing efficiency that occur in existing processing.

[0005] A half-cut thin-wall sleeve hole opening tool, characterized in that it includes a backing body, a tensioning body and a pressing body; the backing body is the base of the entire tool, used for internal support and positioning of the workpiece; the tensioning body is installed on the inner wall of the backing body, used for tensioning and fixing the shape of the workpiece; the pressing body is installed on the outer wall of the backing body, used for local correction and pressing of the workpiece.

[0006] The prototype body includes a stepped cylinder, an end cover and two positioning pins;

[0007] The end cover is a concentric ring structure with a fan-shaped weight-reducing hole, with a through hole in the middle of the inner ring, and the outer diameter of the outer ring is matched with the inner diameter of the stepped cylinder with a small gap; the outer ring has a circle of flanges, and the flanges have M flange holes corresponding to the M threaded holes on the upper end surface of the stepped cylinder; the number of M is 8;

[0008] The locating pin is in the shape of a stepped shaft composed of a large and a small cylindrical surface. There is a guiding cone surface on the stepped surface. The small cylindrical surface is matched with a small clearance in the locating hole on the workpiece, and the large cylindrical surface is fixed in the locating pin hole of the stepped tube by interference fit.

[0009] The outer wall of the stepped cylinder is a three-step cylindrical structure with a diameter decreasing successively from both ends to the center;

[0010] There are axial grooves on the generatrix of the third step cylindrical section surface at the 0° position in the circumferential direction of the upper and lower sections of the outer wall of the stepped cylinder, and upper and lower positioning pin holes on the generatrix at the 180° position in the circumferential direction; there are avoidance holes and avoidance grooves in the circumferential and axial directions; the avoidance grooves surround the upper and lower cantilever support plates on the wall of the stepped cylinder; two symmetrical oblong holes and four symmetrical threaded holes are arranged on both sides of the axial groove of each cantilever support plate

[0011] The second stepped cylindrical sections of the upper and lower sections of the outer wall of the stepped cylinder are symmetrically arranged with N threaded holes for connecting the pressing body; the number N is 12;

[0012] The first steps of the upper and lower sections of the outer wall of the stepped cylinder are used to position the pressing body;

[0013] The upper end surface of the stepped cylinder is evenly distributed with M threaded holes for connecting the end cover, and the number of M is 8.

[0014] There are two sets of tensioning bodies, each set of tensioning bodies includes a shell and two core groups; after the core groups are symmetrically installed into the shells, cylindrical head bolts are used to pass through the countersunk holes on the shells, screwed into the inner wall of the stepped cylinder, and fixed with the threaded holes on the upper and lower cantilever support plates.

[0015] The housing comprises a top cover and a fixing seat;

[0016] There are countersunk holes at the four corners of the top cover, and two equal-length top cover grooves in the middle of the bottom surface; there is a threaded hole in the center of each top cover groove, and there is a square boss between the grooves to limit the movement of the core group;

[0017] There are through holes on the four corners of the fixing seat, which correspond one-to-one to the countersunk holes on the top cover. The bottom surface is an arc surface, which can be close to the inner wall of the step cylinder, and there is a top surface groove in the middle of the top surface; the top surface groove corresponds to the position of the top cover groove; there are two symmetrical long oval holes at the bottom of the top surface groove; the two symmetrical long oval holes correspond to the two symmetrical long oval holes on both sides of the axial engraved groove of the cantilever support plate on the step cylinder.

[0018] The core group comprises a sliding block, a lifting block, an adjusting screw and a set screw.

[0019] The sliding block is a right-angle trapezoidal block, with a "T"-shaped mortise and tenon groove on the inclined surface, and an "L"-shaped hook with an eccentric flange on the head at the center of the bottom surface, which is used to contact the tensioning hole on the workpiece to apply tensioning force;

[0020] The lifting block is an inverted right-angle trapezoidal block, with a flat bottom hole in the center of the top surface, a threaded hole through the trapezoidal surface, and a "T"-shaped tenon on the inclined surface, which corresponds to the tenon groove on the sliding block and is inserted into the sliding block. The sliding block is pressed by the inclined surface of the lifting block to move it, generating tension;

[0021] The adjusting screw head has an annular groove, which is screwed into the threaded hole of the top cover until the bottom surface contacts the flat bottom hole of the lifting block;

[0022] After the set screw is screwed into the threaded hole of the lifting block, the head thereof enters the annular groove.

[0023] The pressing body comprises a pressing plate support, a pressing plate and a pressing screw.

[0024] The pressure plate support is an "F"-shaped structure, with a countersunk hole on the long side, a symmetrical side plate structure on the short side, and a threaded hole on the back; the pressure plate support is connected to N threaded holes on the second stepped cylindrical section of the upper and lower sections of the outer wall through cylindrical head bolts inserted into the countersunk holes to achieve installation with the template body; the number N is 12;

[0025] The bottom surface of the pressing plate is an arc surface with a countersunk hole in the center;

[0026] The center of the small end of the clamping screw has a threaded blind hole, which contacts the top surface of the clamping plate after passing through the threaded hole of the clamping plate support. A bolt passes through the countersunk hole of the clamping plate and is connected with the threaded hole of the clamping screw.

[0027] The present invention also discloses a method for using the semi-split thin-wall sleeve hole-opening tool, which comprises the following steps:

[0028] Step 1: Use the long screw on the work surface to pass through the through hole in the middle of the end cover of the template body, screw in the nut to tighten the end cover, fix the template body on a circular bracket, and complete the fixation of the tooling;

[0029] Step 2: unfold the workpiece from the middle section seam, align the positioning hole on the workpiece with the positioning pin, and sleeve it on the third step cylindrical section of the upper and lower sections of the outer wall of the step cylinder; pass the tensioning hole on the workpiece through the hook of the tensioning body, and tighten the adjusting bolt of the tensioning body with a small torque to preliminarily fix the shape of the workpiece; use 12 cylindrical head bolts to install 12 clamping bodies on the second step cylindrical section of the upper and lower sections of the outer wall of the step cylinder; tighten the clamping bodies symmetrically in the circumferential order from the positioning pin to the axial scored groove, until the outer circle of the workpiece is not higher than the first step cylindrical section of the upper and lower sections of the outer wall of the step cylinder, which is used to perform local correction to avoid local bulging and complete the preliminary positioning of the workpiece;

[0030] Step 3: Use a large torque to adjust the two adjusting screws of the upper and lower tensioning bodies until the spacing of the entire cutting seam meets the required value and the distances from the two side edges to the side walls of the axial groove of the stepped cylinder are equal, so that the workpiece is close to the mold body and the two sides of the cutting seam are symmetrical; tighten the pressing body again according to the sequence of step 2 until the surface of the workpiece does not slide, and the precise positioning of the workpiece is completed;

[0031] Step 4: Start the punching and cutting equipment to complete the processing of each hole.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] (1) This tooling is fully supported by the stepped tube. By using the positioning pin at the generatrix position opposite the cutting seam as a reference and the local correction of the clamping body, the tensioning distance is shortened, local bulging is avoided, the workpiece is fully attached to the mold, the positioning error is reduced, and the accuracy of the hole opening is improved.

[0034] (2) The tooling achieves consistent tensioning on both sides of the workpiece through a symmetrically adjustable tensioning body and a groove datum, thereby ensuring the symmetry of the opening position with respect to the cutting seam.

[0035] (3) The tooling installs the tensioning body on the inner wall of the mold to tension the workpiece from the inside to avoid interference with the hole-making equipment, thereby ensuring the consistency and stability of the processing and improving the efficiency of the hole-making. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] In the attached picture:

[0038] Figure 1 It is an isometric schematic diagram of a half-cut thin-wall sleeve hole opening tooling according to an embodiment of the present invention;

[0039] Figure 2 It is a left-side cross-sectional schematic diagram of a support model body according to an embodiment of the present invention;

[0040] Figure 3 This is a schematic structural diagram of a tensioning body according to an embodiment of the present invention;

[0041] Figure 4 Schematic diagram of the structure of the compression body according to an embodiment of the present invention.

[0042] In the figure: 1 is a supporting body; 2 is a tensioning body; 3 is a pressing body; 4 is an axial groove; 5 is a cantilever support plate; 11 is a stepped cylinder; 12 is an end cover; 13 is a positioning pin; 21 is a shell; 22 is a core group; 211 is a top cover; 212 is a fixed seat; 221 is a sliding block; 222 is a lifting block; 223 is an adjusting screw; 224 is a set screw; 31 is a pressure plate support; 32 is a pressure plate; 33 is a pressing screw.

[0043] Specific implementation methods

[0044] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0045] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0046] like Figure 1 As shown, a semi-cut thin-wall sleeve hole-opening tool comprises a support body (1), a tensioning body (2) and a pressing body (3); the support body (1) is the base of the entire tool, and is used for internal support and positioning of the workpiece; the tensioning body (2) is installed on the inner wall of the support body (1) and is used for tensioning and fixing the shape of the workpiece; the pressing body (2) is installed on the outer wall of the support body (1) and is used for local correction and pressing of the workpiece.

[0047] like Figure 2 As shown, the prototype body (1) comprises a stepped cylinder (11), an end cover (12) and two positioning pins (13);

[0048] The outer wall of the stepped cylinder (11) is a three-step cylindrical structure with diameters decreasing successively from both ends to the center;

[0049] like Figure 1 , Figure 2 As shown, the outer wall of the stepped cylinder (11) has axially scored grooves (4) on the generatrix at the circumferential 0° position of the third stepped cylindrical section surface of the upper and lower sections, and has upper and lower positioning pin holes on the generatrix at the circumferential 180° position; there are avoidance through holes and avoidance through grooves in the circumferential and axial directions; the avoidance through grooves surround upper and lower cantilever support plates (5) on the stepped cylinder wall; two symmetrical oblong holes and four symmetrical threaded holes are arranged on both sides of the axially scored grooves (4) of each cantilever support plate (5);

[0050] The upper and lower second stepped cylindrical sections of the outer wall of the stepped cylinder (11) are symmetrically arranged with 12 threaded holes for connecting the pressing body (3);

[0051] The upper and lower first steps of the outer wall of the stepped cylinder (11) are used to position the pressing body (3);

[0052] The upper end surface of the stepped cylinder (11) is evenly distributed with 8 threaded holes for connecting the end cover (12);

[0053] The end cover (12) is a concentric ring structure with a fan-shaped weight-reducing hole, a through hole is provided in the middle of the inner ring, and the outer diameter of the outer ring is matched with the inner diameter of the stepped cylinder with a small clearance; the outer ring is provided with a flange, and the flange has 8 flange holes corresponding to the 8 threaded holes on the upper end surface of the stepped cylinder (11);

[0054] The positioning pin (13) is in the shape of a stepped shaft composed of a large and a small cylindrical surface. The stepped surface is provided with a guide cone surface. The small cylindrical surface is fitted with a small clearance in the positioning hole on the workpiece, and the large cylindrical surface is fixed in the positioning pin hole of the stepped tube by interference fit.

[0055] like Figure 3 As shown, there are two sets of tensioning bodies (2), each set of tensioning bodies (2) includes a shell (21) and two core groups (22); after the core groups (22) of each set of tensioning bodies (2) are symmetrically installed into the shell (21), cylindrical head bolts are passed through the countersunk holes on the shell (21), screwed into the inner wall of the stepped cylinder (11), and fixed with the threaded holes on the upper and lower cantilever support plates (5).

[0056] like Figure 3As shown, the shell (21) includes a top cover (211) and a fixing seat (212); the top cover (211) has countersunk holes at four corners, and two equal-length top cover grooves are provided in the middle of the bottom surface; each of the top cover grooves has a threaded hole at the center, and a square boss is provided between the grooves for limiting the movement of the core group (22); the fixing seat (212) has through holes at four corners, and the through holes correspond to the countersunk holes on the top cover (211) one by one, the bottom surface is an arc surface that can be tightly attached to the inner wall of the stepped cylinder (11), and the middle of the top surface has a top surface groove; the top surface groove corresponds to the position of the top cover groove; the bottom of the top surface groove has two symmetrical oblong holes; the two symmetrical oblong holes correspond to the two symmetrical oblong holes on both sides of the axial engraved groove (4) of the cantilever support plate (5) on the stepped cylinder (11).

[0057] like Figure 3 As shown, the core group (22) includes a sliding block (221), a lifting block (222), an adjusting screw (223) and a set screw (224); the sliding block (221) is a right-angle trapezoidal block, with a "T"-shaped mortise and tenon groove on the inclined surface, and an "L"-shaped hook with an eccentric flange on the head at the center of the bottom surface, which is used to contact the tensioning hole on the workpiece to apply tensioning force; the lifting block (222) is an inverted right-angle trapezoidal block, with a flat bottom hole at the center of the top surface, and a threaded hole penetrating the trapezoidal surface. The adjusting screw (223) has a hole, and a T-shaped tenon on the inclined surface, which corresponds to the tenon groove on the sliding block (221). The adjusting screw (223) is inserted into the sliding block (221), and the sliding block (221) is pressed by the inclined surface of the lifting block (222) to move, thereby generating a tensioning force. The adjusting screw (223) has an annular groove on its head, and is screwed into the threaded hole of the top cover (211) until the bottom surface contacts the flat bottom hole of the lifting block (222). After the fixing screw (224) is screwed into the threaded hole of the lifting block (222), the head enters the annular groove.

[0058] like Figure 4 As shown, the pressing body (3) comprises a pressing plate support (31), a pressing plate (32) and a pressing screw (33).

[0059] The pressure plate support (31) is an "F"-shaped structure, with a countersunk hole on the long side, a symmetrical side plate structure on the short side, and a threaded hole on the back;

[0060] The pressure plate support (31) is connected to the 12 threaded holes on the second stepped cylindrical sections of the upper and lower sections of the outer wall by cylindrical head bolts inserted into the countersunk holes to achieve installation with the template body (1);

[0061] The bottom surface of the pressing plate (32) is an arc surface with a countersunk hole in the center; the center of the small end of the clamping screw (33) has a threaded blind hole, which contacts the top surface of the pressing plate (32) after passing through the threaded hole of the pressing plate support (31); a bolt passes through the countersunk hole of the pressing plate (32) and is connected to the threaded hole of the clamping screw (33).

[0062] A method for using the half-split thin-wall sleeve hole-opening tool comprises the following steps:

[0063] Step 1: Use a long screw on the work surface to pass through the central through hole of the end cover (12) of the support body (1), screw in a nut to tighten the end cover (12), fix the support body (1) on a circular bracket, and complete the fixation of the tooling.

[0064] Step 2: unfold the workpiece from the middle section seam, align the positioning hole on the workpiece with the positioning pin (13), and put it on the third step cylindrical section of the upper and lower outer wall of the step tube (11); pass the tensioning hole on the workpiece through the hook of the tensioning body (2), and tighten the adjustment bolt of the tensioning body (2) with a small torque to preliminarily fix the shape of the workpiece; use 12 cylindrical head bolts to install 12 clamping bodies (3) on the second step cylindrical section of the upper and lower outer wall of the step tube (11). Tighten the clamping bodies (3) symmetrically in circumferential order from the positioning pin (13) to the axial groove (4) until the outer circle of the workpiece is no higher than the first step cylindrical section of the upper and lower outer wall of the step tube (11). The purpose is to perform local correction to avoid local bulging and complete the preliminary positioning of the workpiece;

[0065] Step 3: Use a large torque to adjust the two adjusting screws (223) of the upper and lower tension bodies (2) until the spacing of the entire cutting seam meets the required value and the distances from the two side edges to the side walls of the axial groove (4) of the stepped cylinder (11) are equal, so that the workpiece is closely attached to the mold body (1) and the two sides of the cutting seam are symmetrical. Tighten the pressing body (3) again according to the sequence of step 2 until the surface of the workpiece does not slide, and the workpiece is accurately positioned.

[0066] Step 4: Start the punching and cutting equipment to complete the hole processing.

[0067] The embodiments of the present invention described above are only used to help explain the present invention. These embodiments are selected and specifically described in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification, which all belong to the protection scope of the present invention.

Claims

1. A semi-cut thin-walled sleeve hole opening tool, characterized in that: It comprises a model body (1), a tensioning body (2) and a pressing body (3), wherein: The prototype body (1) is the base of the entire tooling and is used to support and position the workpiece; The tensioning body (2) is installed on the inner wall of the mold body (1) and is used to tension the workpiece and fix its shape; The pressing body (3) is mounted on the outer wall of the mold body (1) and is used to perform local correction and pressing on the workpiece.

2. A half-cut thin-wall sleeve hole opening tool according to claim 1, characterized in that: The prototype body (1) comprises a stepped cylinder (11), an end cover (12) and a positioning pin (13); The end cover (12) is a concentric ring structure with a fan-shaped weight-reducing hole, a through hole is provided in the middle of the inner ring, and the outer diameter of the outer ring is matched with the inner diameter of the stepped cylinder (11) with a small gap; the outer ring is provided with a flange, and the flange is provided with M flange holes corresponding to the M threaded holes on the upper end surface of the stepped cylinder (11) one by one; There are two positioning pins (13) in the shape of a stepped shaft composed of a large and a small cylindrical surface. The stepped surface has a guiding cone surface. The small cylindrical surface is matched with a positioning hole on the workpiece with a small gap, and the large cylindrical surface is fixed in the positioning pin hole of the stepped tube with an interference fit.

3. A half-cut thin-wall sleeve hole opening tool according to claim 2, characterized in that: The outer wall of the stepped cylinder (11) is a three-step cylindrical structure with diameters decreasing successively from both ends to the center; The outer wall of the stepped cylinder (11) has an axially scored groove (4) on the generatrix at the circumferential 0° position of the third stepped cylindrical section surface of the upper and lower sections, and an upper and lower positioning pin hole on the generatrix at the circumferential 180° position; there are avoidance through holes and avoidance through grooves in the circumferential and axial directions; the avoidance through grooves surround the upper and lower cantilever support plates (5) on the stepped cylinder wall; two symmetrical oblong holes and four symmetrical threaded holes are arranged on both sides of the axially scored groove (4) of each cantilever support plate (5); The upper and lower second stepped cylindrical sections of the outer wall of the stepped cylinder (11) are symmetrically arranged with N threaded holes for connecting the pressing body (3); The upper and lower first steps of the outer wall of the stepped cylinder (11) are used to position the pressing body (3); M threaded holes are evenly distributed on the upper end surface of the stepped cylinder (11) for connecting the end cover (12).

4. A half-cut thin-wall sleeve hole opening tool according to claim 1, characterized in that: The tensioning body (2) has two sets, and each set of the tensioning body (2) includes a shell (21) and two core groups (22); After the tensioning body (2) symmetrically installs the core group (22) into the shell (21), cylindrical head bolts are passed through the countersunk holes on the shell (21), screwed into the inner wall of the stepped cylinder (11), and fixed in cooperation with the threaded holes on the upper and lower cantilever support plates (5).

5. A half-cut thin-wall sleeve hole opening tool as claimed in claim 4, characterized in that: The housing (21) comprises a top cover (211) and a fixing seat (212); The top cover (211) has countersunk holes at the four corners and two equal-length top cover grooves in the middle of the bottom surface; each top cover groove has a threaded hole at its center, and a square boss is provided between the grooves for limiting the movement of the core group (22); The fixing seat (212) has through holes at four corners, the through holes corresponding to the countersunk holes on the top cover (211) one by one, the bottom surface is an arc surface, which can be closely attached to the inner wall of the stepped cylinder (11), and there is a top surface groove in the middle of the top surface; the top surface groove corresponds to the position of the top cover groove; the bottom of the top surface groove has two symmetrical oblong holes; the two symmetrical oblong holes correspond to the two symmetrical oblong holes on both sides of the axial scored groove (4) of the cantilever support plate (5) on the stepped cylinder (11).

6. A half-cut thin-wall sleeve hole opening tool as claimed in claim 4, characterized in that: The core group (22) comprises a sliding block (221), a lifting block (222), an adjusting screw (223) and a set screw (224).

7. A half-cut thin-wall sleeve hole opening tool according to claim 6, characterized in that: The sliding block (221) is a right-angle trapezoidal block, with a "T"-shaped mortise and tenon groove on the inclined surface, and an "L"-shaped hook with an eccentric flange on the head at the center of the bottom surface, which is used to contact the tensioning hole on the workpiece to apply tensioning force; The lifting block (222) is an inverted right-angled trapezoidal block, with a flat bottom hole at the center of the top surface, a threaded hole penetrating the trapezoidal surface, and a "T"-shaped tenon on the inclined surface, which corresponds to the tenon groove on the sliding block (221) and is inserted into the sliding block (221). The inclined surface of the lifting block (222) presses the sliding block (221) to move it, thereby generating tensioning force; The head of the adjusting screw (223) has an annular groove, which is screwed into the threaded hole of the top cover (211) until the bottom surface contacts the flat bottom hole of the lifting block (222); After the set screw (224) is screwed into the threaded hole of the lifting block (222), the head thereof enters the annular groove.

8. A half-cut thin-wall sleeve hole opening tool as claimed in claim 1, characterized in that: The pressing body (3) comprises a pressing plate support (31), a pressing plate (32) and a pressing screw (33).

9. A half-cut thin-wall sleeve hole opening tool according to claim 8, characterized in that: The pressure plate support (31) is an "F"-shaped structure, with a countersunk hole on the long side, a symmetrical side plate structure on the short side, and a threaded hole on the back side; the pressure plate support (31) is connected to the N threaded holes on the second stepped cylindrical section surfaces of the upper and lower sections of the outer wall by means of cylindrical head bolts inserted into the countersunk holes, thereby achieving installation with the support body (1); The bottom surface of the pressing plate (32) is an arc surface with a countersunk hole at the center; The center of the small end of the clamping screw (33) has a threaded blind hole, which contacts the top surface of the clamping plate (32) after passing through the threaded hole of the clamping plate support (31). A bolt passes through the countersunk hole of the clamping plate (32) and is connected to the threaded hole of the clamping screw (33).

10. A method for using a half-cut thin-wall sleeve hole-opening tool, characterized in that: Using the half-cut thin-walled sleeve hole opening tool as described in any one of claims 1 to 9, the steps are as follows: S1: Use a long screw on the work surface to pass through the central through hole of the end cover (12) of the support body (1), screw in a nut to tighten the end cover (12), and fix the support body (1) on a circular bracket to complete the fixing of the tooling; S2: unfold the workpiece from the middle section seam, align the positioning hole on the workpiece with the positioning pin (13), and sleeve it on the upper and lower third step cylindrical sections of the outer wall of the step tube (11); pass the tensioning hole on the workpiece through the hook of the tensioning body (2), and tighten the adjusting bolt of the tensioning body (2) with a small torque to preliminarily fix the shape of the workpiece; use N cylindrical head bolts to install N clamping bodies (3) on the upper and lower second step cylindrical sections of the outer wall of the step tube (11); tighten the clamping bodies (3) symmetrically in circumferential order from the positioning pin (13) to the axial groove (4) until the outer circle of the workpiece is not higher than the upper and lower first step cylindrical sections of the outer wall of the step tube (11), so as to perform local correction to avoid local bulging and complete the preliminary positioning of the workpiece; S3: Use a large torque to adjust the two adjusting screws (223) of the upper and lower tensioning bodies (2) until the spacing of the entire cutting seam meets the required value and the distances from the two side edges to the side walls of the axial groove (4) of the stepped cylinder (11) are equal, so that the workpiece is closely attached to the mold body (1) and the two sides of the cutting seam are symmetrical; tighten the pressing body (3) again according to the sequence of step 2 until the surface of the workpiece does not slide, thereby completing the precise positioning of the workpiece; S4: Start the punching and cutting equipment to complete the hole processing.

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