Angle head checking tool and checking method

Abstract

The invention relates to the technical field of numerical control machining, in particular to an angle head checking tool and method, and the checking tool comprises a base body and a clamping position adjusting mechanism. A bolt adaptive hole is formed in the base body in a penetrating mode based on the axis of the base body. Two wedge-shaped lugs are symmetrically arranged at the bottom of the base body based on the axis of the base body. The clamping position adjusting mechanism comprises a wedge-shaped nut and a bolt assembly. The wedge-shaped nut is positioned between the two wedge-shaped lugs and is in wedge-shaped fit with the two wedge-shaped lugs; the bolt assembly penetrates through the bolt adaptive hole from the top of the base body and then is in threaded connection with the wedge-shaped nut. According to the technical scheme, the checking tool is adopted to check the angle head, whether the angle head can be normally used or not and the influence degree on the subsequent manufacturing precision are pre-judged in advance according to the detected error value, the use risk is found in advance, the product manufacturing precision is guaranteed, and product faults are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control machining, and in particular to an angle head calibration tool and a calibration method. Background Art

[0002] In CNC machining, narrow spaces and special positions cannot usually be processed directly using ordinary tool holders, and angle heads have become an important tool for supplementary machining. For example, the Chinese patent document with publication number CN108098417A discloses a process method for clamping and positioning angle heads using adjustment pads, which mainly includes the following parts for coordinated control: machine tool spindle, adjustment pad, standard positioning block, positioning bolt, angle head, adjustment pad screw, standard positioning block positioning pin, standard positioning block screw, and calibration strip; it solves the problem of rapid positioning and clamping of angle heads and machine tools, simplifies the adjustment pad structure, and is conducive to the unified management of standard positioning blocks for angle heads.

[0003] However, the angle head is a special tool holder. When the angle head accuracy does not meet the processing requirements, the current tool measuring instrument cannot detect the damage to the angle head accuracy, and there is a risk of tool failure. When the angle head is installed in the machine tool, it needs to be fixed with a retaining ring. Due to the individual differences in the angle head locating pins, when the angle head is installed, there is a possibility of interference between the locating pins and the retaining ring, causing the tool position on the angle head to shift. However, there is currently no method to check the position deviation of the angle head, and there is no detection equipment available on the market, which poses a great risk. There are often dimensional deviations caused by angle head problems or improper use. Therefore, solving the calibration method of the angle head has become an urgent issue. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned prior art, the present invention discloses an angle head calibration tool and a calibration method, which can predict in advance whether the angle head can be used normally and the degree of influence on subsequent manufacturing accuracy through the detected error value, thereby discovering the use risks in advance, ensuring product manufacturing accuracy and reducing product failures.

[0005] This application specifically achieves the above objectives through the following technical solutions:

[0006] An angle head calibration tool, characterized by comprising a base body and a positioning adjustment mechanism;

[0007] The base body is a quadrangular prism structure, and its bottom surface is rectangular; a bolt adapter hole is provided inside the base body based on its axis; and two wedge-shaped ear pieces are symmetrically provided on the bottom of the base body based on its axis;

[0008] The positioning adjustment mechanism includes a wedge-shaped nut and a bolt assembly; the wedge-shaped nut is located between two wedge-shaped ears and is wedge-matched with the two wedge-shaped ears; the bolt assembly passes through the bolt adapter hole from the top of the base and is threadedly connected with the wedge-shaped nut.

[0009] Preferably, a leveling unit is also included, and the leveling unit includes a plurality of leveling components arranged at intervals on the side of the base; the leveling components include leveling ears and leveling bolts, the leveling ears are fixedly connected to the base, the leveling bolts are provided with threaded holes parallel to the axis of the base, and the leveling bolts are movably connected to the leveling ears through the threaded holes.

[0010] Preferably, the bottom surface of the leveling ear piece and the bottom surface of the base are in the same plane.

[0011] Preferably, the positioning adjustment mechanism includes a bolt body and a gasket; the bolt body includes an integrally formed nut and a screw rod, and a multi-ribbed groove is provided on the top of the nut.

[0012] Preferably, the bolt adapter hole comprises a through-rod hole for allowing the screw rod to pass through, and a cap groove for hiding the nut is arranged at the top of the through-rod hole.

[0013] A method for calibrating an angle head, using the above-mentioned angle head calibration tool, comprises the following steps:

[0014] S1, installing the angle head calibration tool, including inserting two wedge-shaped ear pieces of the angle head calibration tool into the wedge-shaped grooves of the machine tool worktable, and adjusting the clamping adjustment mechanism to cooperate with the two wedge-shaped ear pieces to fit and fix the base on the machine tool worktable;

[0015] S2, establishing a reference, including selecting two intersecting side surfaces of the substrate as reference plane K1 and reference plane K2 respectively, and establishing a workpiece coordinate system with the center point of the top surface of the substrate as the origin (x0, y0, z0);

[0016] S3, installing the angle head, including installing the angle head equipped with the tool on the machine tool spindle, and recording the tool installation parameters, including the tool radius R, the distance L2 between the tool tip and the machine tool spindle;

[0017] S4, measuring the angle head error, includes controlling the machine tool spindle to move so that the tool is close to the substrate, and then in the workpiece coordinate system, taking the substrate top surface, reference surface K1 and reference surface K2 as the measurement reference, and combining the tool installation parameters to obtain the angle head error.

[0018] Preferably, in step S2, establishing the reference also includes aligning the flatness of the top surface of the substrate, that is, a leveling unit is provided on the angle head calibration tool, and after the substrate is fitted and fixed on the machine tool worktable, the leveling unit is used to level the substrate, and the flatness of the top surface of the substrate is aligned with the dial indicator.

[0019] Preferably, in step S2, establishing the reference further comprises aligning the reference plane K1, the reference plane K2 and the origin (x0, y0, z0) using a dial indicator before establishing the workpiece coordinate system.

[0020] Preferably, in step S3, installing the angle head further comprises aligning the angle head based on a dial indicator after the angle head is installed on the spindle of the machine tool, and locking a positioning mechanism of the angle head after the alignment is completed.

[0021] Preferably, in step S4, measuring the angle head error comprises the following steps:

[0022] S41, setting the allowable distance range N of the tool close to the substrate, denoting the length of the intersection line of the reference plane K2 and the top surface of the substrate as b, and the length of the intersection line of the reference plane K1 and the top surface of the substrate as a;

[0023] S42, controlling the machine tool spindle to move so that the tool arc surface gradually approaches the top surface of the substrate, until the vertical distance between the tool arc surface and the top surface of the substrate is within the allowable distance range N, and controlling the machine tool spindle to stop moving;

[0024] S43, recording the coordinate value (x1, y1, z1) of the tool tip in the workpiece coordinate system, and measuring the gap H1 between the arc surface of the tool and the top surface of the substrate with a feeler gauge;

[0025] S44, controlling the machine tool spindle to move so that the tool arc surface gradually approaches the reference plane K1, until the vertical distance between the tool arc surface and the reference plane K1 is within the allowable distance range N, and controlling the machine tool spindle to stop moving;

[0026] S45, recording the coordinate value (x2, y2, z2) of the tool tip in the workpiece coordinate system, and measuring the gap H2 between the tool arc surface and the reference surface K1 with a feeler gauge;

[0027] S46, controlling the machine tool spindle to move so that the tool tip gradually approaches the reference plane K2 until the vertical distance between the tool tip and the reference plane K2 is within the allowable distance range N, and controlling the machine tool spindle to stop moving;

[0028] S47, recording the coordinate value (x3, y3, z3) of the tool tip in the workpiece coordinate system, and measuring the gap H3 between the tool tip and the reference surface K2 with a feeler gauge;

[0029] S48, calculates the errors of the angle head in the X-axis, Y-axis and Z-axis directions of the workpiece coordinate system; that is, the X-axis error Y-axis error Z axis error D z =z0-(z1+R+H1).

[0030] Preferably, in step S41, the distance range N is set to a value of 0.2-1.0 mm.

[0031] Beneficial technical effects brought by the present invention:

[0032] The present invention discloses an angle head calibration tool and a calibration method. In actual use, before the angle head is installed, the calibration tool is used to detect the position of the machine tool; after the angle head is installed, the calibration tool is used in combination with the calibration method to detect the position of the angle head after installation and debugging. In this way, when the angle head itself fails or there is a problem with the installation, before the angle head formally participates in part processing, the accuracy of the angle head can be detected through this technical solution, and the error of the angle head itself and the installation error can be detected, thereby achieving the purpose of reducing product failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the front structure of the angle head calibration tool;

[0034] Figure 2 It is a schematic diagram of the upward structure of the angle head calibration tool;

[0035] Figure 3 It is a schematic diagram of the side cross-sectional structure of the angle head calibration tool;

[0036] Figure 4 This is a schematic diagram of the installation and use of the angle head calibration tool;

[0037] Figure 5 It is a schematic diagram of the relative position relationship between the tool and the substrate when the tool is close to the top surface of the substrate;

[0038] Figure 6 Schematic diagram of the relative position relationship between the tool and the base when the tool approaches the reference plane K1.

[0039] In the figure:

[0040] 1. Base; 1.1. Top surface; 1.2. Reference surface K1; 1.3. Reference surface K2; 1.4. Bottom surface; 2. Wedge-shaped ear; 3. Wedge-shaped nut; 4. Bolt assembly; 4.1. Screw rod; 4.2. Nut; 4.3. Multi-sided groove; 4.4. Gasket; 5. Bolt adapter hole; 5.1. Through rod hole; 5.2. Cap groove; 6. Leveling assembly; 6.1. Leveling bolt; 6.2. Leveling ear; 7. Machine tool working platform; 7.1. Wedge-shaped groove; 8. Tool; 9. Angle head. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0042] Therefore, the following detailed description of the invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Example 1

[0044] This embodiment discloses a calibration tool and a calibration method for an angle head 9, as a preferred embodiment of the present invention. Figure 1 As shown, the calibration tool includes a base 1 and a positioning adjustment mechanism. The base 1 is a quadrangular prism structure, and its bottom surface 1.4 is rectangular. A bolt adapter hole 5 is provided inside the base 1 based on its axis; two wedge-shaped ears 2 are symmetrically provided at the bottom of the base 1 based on its axis. The positioning adjustment mechanism includes a wedge-shaped nut 3 and a bolt assembly 4; the wedge-shaped nut 3 is located between the two wedge-shaped ears 2 and is wedge-matched with the two wedge-shaped ears 2; the bolt assembly 4 passes through the bolt adapter hole 5 from the top of the base 1 and is threadedly connected with the wedge-shaped nut 3.

[0045] Based on the structure of the above-mentioned calibration tool, the calibration method of the angle head 9 includes the following steps:

[0046] S1, installing the angle head 9 calibration tool, including inserting the two wedge-shaped ear pieces 2 of the angle head 9 calibration tool into the wedge-shaped groove 7.1 of the machine tool workbench, and adjusting the clamping adjustment mechanism to cooperate with the two wedge-shaped ear pieces 2 to fit and fix the base 1 on the machine tool workbench, such as Figure 4 The principle is as follows: by rotating the bolt assembly 4, the wedge nut 3 moves upward along the bolt assembly 4, gradually squeezing and tightening the two wedge-shaped lugs 2 outward, and the squeezed and tightened two wedge-shaped lugs 2 clamp the wedge-shaped groove 7.1 of the machine tool worktable, so that the base 1 is fitted and fixed on the machine tool worktable.

[0047] S2, establishing a reference, including selecting two intersecting side surfaces of the substrate 1 as reference planes K11.2 and K21.3 respectively, and establishing a workpiece coordinate system with the center point of the top surface 1.1 of the substrate 1 as the origin (x0, y0, z0).

[0048] S3, installing the angle head 9, including installing the angle head 9 with the tool 8 on the machine tool spindle, and recording the installation parameters of the tool 8, including the radius R of the tool 8, and the distance L2 between the tool tip and the machine tool spindle (center axis), such as Figure 5 shown.

[0049] S4, measuring the error of the angle head 9, including controlling the machine tool spindle to move so that the tool 8 is close to the base 1, and then in the workpiece coordinate system, taking the top surface 1.1 of the base 1, the reference surface K11.2 and the reference surface K21.3 as the measurement reference, and combining the installation parameters of the tool 8 to obtain the error of the angle head 9.

[0050] Therefore, if the measured error of the angle head 9 exceeds the allowable range, the use of the angle head 9 is immediately stopped to avoid subsequent processing affecting the product manufacturing accuracy.

[0051] Example 2

[0052] The present embodiment discloses an angle head 9 calibration tool and calibration method, as a preferred implementation mode of the present invention, that is, based on Example 1, it also includes a leveling unit, and the leveling unit includes a plurality of leveling components 6 arranged at intervals on the side of the base 1; the leveling component 6 includes a leveling ear 6.2 and a leveling bolt 6.1, the leveling ear 6.2 is fixedly connected to the base 1, and the leveling bolt 6.1 is provided with a threaded hole parallel to the axis of the base 1, and the leveling bolt 6.1 is movably connected to the leveling ear 6.2 through the threaded hole.

[0053] Based on the above structure, the leveling principle of the calibration tool is: by rotating the leveling bolt 6.1, the bottom of the leveling bolt 6.1 contacts the surface of the machine tool worktable to generate support, and then adjusts the gap between the corresponding leveling ear 6.2 and the surface of the machine tool worktable. On this basis, since the leveling ear 6.2 is integrated with the base 1, changing the gap between the leveling ear 6.2 and the surface of the machine tool worktable also changes the local height of the base 1. Therefore, multiple leveling components 6 cooperate to achieve multi-directional local height adjustment of the base 1 to ensure the flatness of the top surface 1.1 of the base 1.

[0054] Furthermore, the bottom surface 1.4 of the leveling ear 6.2 is in the same plane as the bottom surface 1.4 of the base 1, which facilitates observation of the gap change between the leveling ear 6.2 and the surface of the machine tool worktable, and is of great significance for high-precision adjustment of the flatness of the top surface 1.1 of the base 1.

[0055] Example 3

[0056] This embodiment discloses an angle head 9 calibration tool and calibration method, as a preferred embodiment of the present invention, that is, based on embodiment 1 or 2, its positioning adjustment mechanism includes a bolt body and a gasket 4.4; the bolt body includes an integrally formed nut 4.2 and a screw rod 4.1, and a multi-ribbed groove 4.3 is provided on the top of the nut 4.2. The multi-ribbed groove 4.3 is provided to facilitate the rotation of the bolt body with an external auxiliary tool.

[0057] Accordingly, the bolt adapter hole 5 includes a rod-penetrating hole 5.1 for the screw rod 4.1 to pass through, and a cap groove 5.2 for hiding the nut 4.2 is arranged at the top of the rod-penetrating hole 5.1. In the technical solution, based on the arrangement of the cap groove 5.2, the nut 4.2 is embedded in the base 1, which facilitates the origin positioning before establishing the workpiece coordinate system and also facilitates the determination of various benchmarks.

[0058] Example 4

[0059] This embodiment discloses a calibration tool and a calibration method for an angle head 9. As a preferred embodiment of the present invention, based on the calibration tool in Embodiment 1, 2 or 3, in order to reduce the subsequent error, the calibration method for the angle head 9 includes basic alignment and straightening operations, that is, the calibration method for the angle head 9 includes the following steps:

[0060] S1, installing the angle head 9 calibration tool, including inserting the two wedge-shaped ear pieces 2 of the angle head 9 calibration tool into the wedge-shaped grooves 7.1 of the machine tool workbench, and adjusting the positioning adjustment mechanism to cooperate with the two wedge-shaped ear pieces 2 to fit and fix the base 1 on the machine tool workbench.

[0061] S2, establishing a reference, including selecting two intersecting side surfaces of the substrate 1 as reference planes K11.2 and K21.3 respectively, and establishing a workpiece coordinate system with the center point of the top surface 1.1 of the substrate 1 as the origin (x0, y0, z0).

[0062] Furthermore, establishing the reference also includes aligning the flatness of the top surface 1.1 of the substrate 1, that is, a leveling unit is set on the angle head 9 calibration tool, and after the substrate 1 is fitted and fixed on the machine tool workbench, the leveling unit is used to level the substrate 1, and the flatness of the top surface 1.1 of the substrate 1 is aligned with the dial indicator, thereby ensuring that the subsequent Z-direction reference line / surface is within a controllable tolerance range.

[0063] Further establishing the datum also includes using a dial indicator to align the datum plane K11.2, the datum plane K21.3 and the origin (x0, y0, z0) before establishing the workpiece coordinate system, thereby ensuring that the subsequent X / Y datum lines / surfaces are within a controllable tolerance range.

[0064] S3, installing the angle head 9, including installing the angle head 9 equipped with the tool 8 on the machine tool spindle, and recording the installation parameters of the tool 8, including the radius R of the tool 8 and the distance L2 between the tool tip and the machine tool spindle.

[0065] Furthermore, installing the angle head 9 also includes aligning the angle head 9 based on a dial indicator after the angle head 9 is installed on the main shaft of the machine tool, and locking the positioning mechanism of the angle head 9 after the alignment is completed.

[0066] S4, measuring the error of the angle head 9, including controlling the machine tool spindle to move so that the tool 8 is close to the base 1, and then in the workpiece coordinate system, taking the top surface 1.1 of the base 1, the reference surface K11.2 and the reference surface K21.3 as the measurement reference, and combining the installation parameters of the tool 8 to obtain the error of the angle head 9.

[0067] Example 5

[0068] This embodiment discloses a calibration tool and a calibration method for an angle head 9, as a preferred embodiment of the present invention, that is, based on Embodiment 1, 2, 3 or 4, in step S4, measuring the error of the angle head 9 includes the following steps:

[0069] S41, set the allowable distance range N of the tool 8 close to the substrate 1, and record the length of the intersection line of the reference plane K21.3 and the top surface 1.1 of the substrate 1 as b, and the length of the intersection line of the reference plane K11.2 and the top surface 1.1 of the substrate 1 as a. Further, the value of the distance range N is 0.2-1.0 mm.

[0070] S42, controlling the machine tool spindle to move so that the arc surface of the tool 8 gradually approaches the top surface 1.1 of the substrate 1, until the vertical distance between the arc surface of the tool 8 and the top surface 1.1 of the substrate 1 is within the allowable distance range N, and controlling the machine tool spindle to stop moving.

[0071] S43, recording the coordinate values ​​(x1, y1, z1) of the tool tip of the tool 8 in the workpiece coordinate system, and measuring the gap H1 between the arc surface of the tool 8 and the top surface 1.1 of the substrate 1 with a feeler gauge.

[0072] S44, control the machine tool spindle to move, so that the arc surface of the tool 8 gradually approaches the reference surface K11.2, until the vertical distance between the arc surface of the tool 8 and the reference surface K11.2 is within the allowable distance range N, and control the machine tool spindle to stop moving.

[0073] S45, record the coordinate value (x2, y2, z2) of the tool tip of the tool 8 in the workpiece coordinate system, and use a feeler gauge to measure the gap H2 between the arc surface of the tool 8 and the reference surface K11.2.

[0074] S46, control the machine tool spindle to move so that the tip of the tool 8 gradually approaches the reference plane K21.3, until the vertical distance between the tip of the tool 8 and the reference plane K21.3 is within the allowable distance range N, and control the machine tool spindle to stop moving.

[0075] S47, record the coordinate value (x3, y3, z3) of the tool tip of the tool 8 in the workpiece coordinate system, and use a feeler gauge to measure the gap H3 between the tool tip of the tool 8 and the reference surface K21.3.

[0076] S48, calculating the errors of the angle head 9 in the X-axis, Y-axis and Z-axis directions of the workpiece coordinate system; that is, the X-axis error Y axis error Z axis error D z =z0-(z1+R+H1).

[0077] Therefore, the X-axis error D x , Y axis error D y and Z-axis error D z If the error in any direction exceeds the allowable range, the use of the angle head 9 is stopped immediately to avoid the subsequent processing affecting the product manufacturing accuracy.

Claims

1. An angle head (9) calibration tool, characterized in that: It comprises a base body (1) and a positioning adjustment mechanism; The base (1) is in a quadrangular prism structure, and its bottom surface (1.4) is rectangular; a bolt adapter hole (5) is provided inside the base (1) based on its axis and penetrates through it; and two wedge-shaped ear pieces (2) are symmetrically provided at the bottom of the base (1) based on its axis. The positioning adjustment mechanism comprises a wedge-shaped nut (3) and a bolt assembly (4); the wedge-shaped nut (3) is located between two wedge-shaped ear pieces (2) and is wedge-matched with the two wedge-shaped ear pieces (2); the bolt assembly (4) passes through the bolt adapter hole (5) from the top of the base (1) and is threadedly connected to the wedge-shaped nut (3).

2. An angle head (9) calibration tool as claimed in claim 1, characterized in that: The invention also comprises a leveling unit, and the leveling unit comprises a plurality of leveling components (6) arranged at intervals on the side of the base (1); the leveling component (6) comprises a leveling ear (6.2) and a leveling bolt (6.1); the leveling ear (6.2) is fixedly connected to the base (1); the leveling bolt (6.1) is provided with a threaded hole parallel to the axis of the base (1); the leveling bolt (6.1) is movably connected to the leveling ear (6.2) through the threaded hole.

3. An angle head (9) calibration tool as claimed in claim 2, characterized in that: The bottom surface (1.4) of the leveling ear piece (6.2) and the bottom surface (1.4) of the base body (1) are in the same plane.

4. An angle head (9) calibration tool as claimed in claim 1, characterized in that: The positioning adjustment mechanism comprises a bolt body and a gasket (4.4); the bolt body comprises an integrally formed nut (4.2) and a screw rod (4.1); a multi-ribbed groove (4.3) is provided on the top of the nut (4.2).

5. An angle head (9) calibration tool as claimed in claim 5, characterized in that: The bolt adapter hole (5) comprises a rod-penetrating hole (5.1) for allowing the screw rod (4.1) to pass through, and a cap groove (5.2) for hiding the nut (4.2) is arranged at the top of the rod-penetrating hole (5.1).

6. A method for calibrating an angle head (9), characterized in that: An angle head (9) calibration tool as claimed in any one of claims 1 to 5 is used, comprising the following steps: S1, installing the angle head (9) calibration tool, including inserting two wedge-shaped ear pieces (2) of the angle head (9) calibration tool into the wedge-shaped grooves (7.1) of the machine tool workbench, and adjusting the clamping adjustment mechanism to cooperate with the two wedge-shaped ear pieces (2) to fit and fix the base body (1) on the machine tool workbench; S2, establishing a reference, including selecting two intersecting side surfaces of the base (1) as reference plane K1 (1.2) and reference plane K2 (1.3), respectively, and establishing a workpiece coordinate system with the center point of the top surface (1.1) of the base (1) as the origin (x0, y0, z0); S3, installing the angle head (9), including installing the angle head (9) equipped with the tool (8) on the main spindle of the machine tool, and recording the installation parameters of the tool (8), including the radius R of the tool (8) and the distance L2 between the tool tip and the main spindle of the machine tool; S4, measuring the error of the angle head (9), including controlling the machine tool spindle to move so that the tool (8) is close to the base (1), and then in the workpiece coordinate system, taking the top surface (1.1) of the base (1), the reference surface K1 (1.2) and the reference surface K2 (1.3) as the measurement reference, and combining the installation parameters of the tool (8) to obtain the error of the angle head (9).

7. A method for calibrating an angle head (9) as claimed in claim 6, characterized in that: In the step S2, establishing the reference also includes aligning the flatness of the top surface (1.1) of the substrate (1), that is, a leveling unit is provided on the angle head (9) calibration tool, and after the substrate (1) is fitted and fixed on the machine tool workbench, the leveling unit is used to perform a leveling operation on the substrate (1), and the flatness of the top surface (1.1) of the substrate (1) is aligned with a dial indicator.

8. A method for calibrating an angle head (9) as claimed in claim 6, characterized in that: In the step S2, establishing the reference further includes aligning the reference plane K1 (1.2), the reference plane K2 (1.3) and the origin (x0, y0, z0) using a dial indicator before establishing the workpiece coordinate system.

9. A method for calibrating an angle head (9) as claimed in claim 6, characterized in that: In the step S3, installing the angle head (9) further comprises, after the angle head (9) is installed on the main spindle of the machine tool, aligning the angle head (9) based on a dial indicator, and locking a positioning mechanism of the angle head (9) after the alignment is completed.

10. A method for calibrating an angle head (9) as claimed in claim 6, characterized in that: In step S4, measuring the error of the angle head (9) comprises the following steps: S41, setting the allowable distance range N of the tool (8) close to the substrate (1), recording the length of the intersection line of the reference plane K2 (1.3) and the top surface (1.1) of the substrate (1) as b, and the length of the intersection line of the reference plane K1 (1.2) and the top surface (1.1) of the substrate (1) as a; S42, controlling the machine tool spindle to move so that the arc surface of the tool (8) gradually approaches the top surface (1.1) of the base (1), until the vertical distance between the arc surface of the tool (8) and the top surface (1.1) of the base (1) is within the allowable distance range N, and controlling the machine tool spindle to stop moving; S43, recording the coordinate values ​​(x1, y1, z1) of the tool tip of the tool (8) in the workpiece coordinate system, and measuring the gap H1 between the arc surface of the tool (8) and the top surface (1.1) of the base (1) with a feeler gauge; S44, controlling the machine tool spindle to move so that the arc surface of the tool (8) gradually approaches the reference plane K1 (1.2), until the vertical distance between the arc surface of the tool (8) and the reference plane K1 (1.2) is within the allowable distance range N, and controlling the machine tool spindle to stop moving; S45, recording the coordinate values ​​(x2, y2, z2) of the tool tip of the tool (8) in the workpiece coordinate system, and measuring the gap H2 between the arc surface of the tool (8) and the reference surface K1 (1.2) with a feeler gauge; S46, controlling the machine tool spindle to move so that the tip of the tool (8) gradually approaches the reference plane K2 (1.3), until the vertical distance between the tip of the tool (8) and the reference plane K2 (1.3) is within the allowable distance range N, and controlling the machine tool spindle to stop moving; S47, recording the coordinate value (x3, y3, z3) of the tool tip of the tool (8) in the workpiece coordinate system, and measuring the gap H3 between the tool tip of the tool (8) and the reference surface K2 (1.3) with a feeler gauge; S48, calculating the errors of the angle head (9) in the X-axis, Y-axis and Z-axis directions of the workpiece coordinate system; that is, the X-axis error Y axis error Z axis error D z =z0-(z1+R+H1).

11. A method for calibrating an angle head as claimed in claim 10, characterized in that: In the step S41, the distance range N is set to a value of 0.2-1.0 mm.

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