Threaded hole in-situ automatic tapping and wire thread insert automatic mounting method

Abstract

A threaded hole in-situ automatic tapping and wire thread insert automatic mounting method belongs to the technical field of machinery and comprises the following steps: mounting a tapping machine on a machining head of an ITP mechanism for three-dimensional vertical machining detection; a satellite structure body to be machined is installed on the assembling rotary table; a screw tap for thread tapping is mounted on a quick-change drill chuck at the tail end of the tapping machine; the assembling rotary table is rotated, and the to-be-machined face of the satellite structure body is adjusted to face the side of the screw tap; the ITP mechanism is used for driving the screw tap to move to approach the satellite structure body, and the tapping machine is used for completing tapping operation of the unthreaded hole; after tapping operation is completed, the screw tap is taken down, and a steel wire thread insert positioning rod is installed on a tapping machine; and the tapping machine is driven by the ITP mechanism to complete the installation operation of the steel wire thread insert. In the satellite structure assembling process, on-satellite threaded hole tapping and steel wire thread sleeve automatic installation are achieved, the difficulty and strength of on-satellite operation of operators are reduced, and the preparation precision, quality consistency and stability of on-satellite threaded holes are improved.

Description

Technical Field

[0001] The invention relates to an in-situ automatic tapping method for a threaded hole and an automatic installation method for a wire screw sleeve, belonging to the technical field of machinery. Background Art

[0002] There are a large number of equipment installation interfaces on the satellite structure. The threaded installation interfaces of these devices are mostly threaded and installed with wire screw inserts during the assembly process of the satellite structure. The number of on-board tapping and wire screw insert installation involved in the assembly of a single satellite structure can reach thousands of times. However, due to the wide distribution of threaded holes to be prepared on the satellite structure, multiple angles, high precision, and narrow operating space, the threaded hole tapping and wire screw insert installation of these equipment interfaces are currently performed manually by fitters. Manual tapping and wire screw insert installation are labor-intensive and inefficient. When the operator is lying on his back, prone or leaning forward, there is a risk of the operating tool falling from a height, and the tapping quality is difficult to guarantee. Quality problems such as excessive verticality of the threaded hole are prone to occur. In the process of installing the wire screw insert, the operating skills of the fitter are required to be high. When installing the wire screw insert in the countersunk hole, the entrance of the wire screw insert cannot be accurately located, and the wire screw insert cannot be held by hand, resulting in blind installation. When the wire screw insert is connected to the installation tool, it is only fixed by the groove. When the tool is close to the threaded hole, the wire screw insert is easy to fall off, and when the wire screw insert is manually screwed in, it is easy to cause jump thread and deformation of the wire screw insert due to uneven manual downward pressure, resulting in a low success rate of wire screw insert installation on the satellite. Summary of the invention

[0003] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art, provide a method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts, realize the tapping of threaded holes and automatic installation of wire thread inserts on the satellite during the assembly of satellite structures, reduce the difficulty and intensity of operators' on-satellite operations, improve the preparation accuracy, quality consistency and stability of threaded holes on the satellite, and greatly improve the installation efficiency of wire thread inserts on the satellite.

[0004] The technical solution of the present invention is: a method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts, comprising:

[0005] The tapping machine is mounted on a processing head of an ITP mechanism for three-dimensional vertical processing and detection; the tapping machine supports multiple degrees of freedom;

[0006] Mounting the satellite structure body to be processed on the assembly turntable;

[0007] Install the tap for thread tapping on the quick-change drill chuck at the end of the tapping machine;

[0008] Rotate the assembly turntable to adjust the to-be-processed surface of the satellite structure body toward the tap side;

[0009] The ITP mechanism is used to drive the tap to move close to the satellite structure body, and the mechanical arm of the tapping machine is controlled to align the tap above the structural hole to be tapped in the satellite structure body, and the tapping machine is used to complete the tapping operation of the light hole;

[0010] After the tapping operation is completed, the tap is removed, and a wire screw sleeve positioning rod is installed on the tapping machine. The double-nut wire screw sleeve limiting block and the wire screw sleeve to be installed are installed on the wire screw sleeve positioning rod in sequence;

[0011] The ITP mechanism is used to drive the tapping machine to complete the wire thread insert installation operation.

[0012] Furthermore, according to the length of the wire screw insert to be installed, the position of the double-nut wire screw insert limit block is adjusted, and the positioning length is the length of the wire screw insert + 1.2 to 1.5 times the pitch.

[0013] Furthermore, the double-nut wire thread sleeve limit block is made of polytetrafluoroethylene, with an outer diameter of 10 mm, an internal thread of M5, and a thickness of 8 mm.

[0014] Furthermore, a positioning platform for the wire screw insert breaking handle is processed on the end surface of the wire screw insert positioning rod, the height of the positioning platform is 1 times the pitch, and the cross-section of the positioning platform is designed according to the parameters of the wire screw insert breaking handle.

[0015] Furthermore, when the model of the wire screw insert is ST5, the position of the breaking handle is at 1 / 3 of the diameter of the wire screw insert positioning rod, and the positioning table chamfer angle parameter is 30°±2°, ensuring that after the wire screw insert is screwed onto the positioning rod, the breaking handle is tightly positioned and fitted with the positioning table on the end face of the wire screw insert positioning rod.

[0016] Furthermore, the tapping depth and torque parameters of the tapping machine are determined according to the material being processed.

[0017] Furthermore, the wire screw sleeve positioning rod is made of 45# steel, has a length of 100 mm, a clamping section diameter of 6 mm, a positioning section processed with an M5 external thread, a thread length of 60 mm, and is smooth and burr-free.

[0018] Furthermore, the wire screw sleeve is a wire screw sleeve with a breaking groove.

[0019] Furthermore, the ITP mechanism and the tapping mechanism form a multi-degree-of-freedom thread tapping robot arm, the operating space of the robot arm is 6m×6m×3m, and it cooperates with the assembly turntable to realize the tapping and wire thread sleeve installation operations on the five surfaces of the star body.

[0020] Furthermore, the double-nut wire screw insert limit block and the wire screw insert to be installed are installed on the wire screw insert positioning rod in sequence, and the number of turns of the tapping machine is set, and it is screwed in forward; after the wire screw insert is installed in place, the tapping machine is reversed and exited; the number of turns of screwing in is the number of turns of the wire screw insert installation + 1.

[0021] The advantages of the present invention compared with the prior art are:

[0022] (1) Taking advantage of the large operating range and high positioning accuracy of ITP, an ultra-large and highly stable multi-degree-of-freedom thread tapping robot arm is formed with a multi-degree-of-freedom tapping machine. The operating space of the robot arm reaches 6m×6m×3m, which can realize tapping and wire thread installation operations on the five surfaces of the star.

[0023] (2) In combination with ITP and assembly turntable, precise positioning of a specific position of the satellite can be achieved. The tapping machine unit can be used to reliably clamp and precisely position the tap and the threaded hole to be processed. It can be used for tapping structural holes of different materials and sizes, transforming pure manual tapping and installation of wire screw inserts into automatic processing, reducing operating intensity and improving the quality and efficiency of tapping and installation of wire screw inserts.

[0024] (3) The present invention determines the optimal fixing angle parameters of the wire screw insert through repeated research and testing on the spiral angle of the tail of the wire screw insert, thereby ensuring the stability and firmness of the wire screw insert installation process; at the same time, a wire screw insert installation depth limit block is provided to improve the accuracy and consistency of the wire screw insert installation depth. The present invention is particularly suitable for the installation of blind hole wire screw inserts on the entire satellite sinking platform. The installation quality is reliable, the system is easy to learn and use, and the dependence of the wire screw insert installation on the personnel's ability is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the on-board automatic tapping of the present invention.

[0027] Figure 2 It is a schematic diagram of the automatic installation of the on-star wire thread insert of the present invention.

[0028] In the figure: 1, satellite structure body, 2, assembly turntable, 3, ITP, 4, tapping machine, 5, quick-change drill chuck, 6, tap, 7, wire thread insert positioning rod, 8, double nut wire thread insert limit block, 9, wire thread insert;

[0029] Figure 3 This is a schematic diagram of the positioning platform structure. DETAILED DESCRIPTION

[0030] In order to better understand the above technical scheme, the technical scheme of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical scheme of the present invention, rather than limitations on the technical scheme of the present invention. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0031] The following is a further detailed description of a method for in-situ automatic tapping of a threaded hole and automatic installation of a wire screw insert provided by an embodiment of the present invention in conjunction with the accompanying drawings of the specification. The specific implementation method may include:

[0032] (1) Using a multifunctional three-dimensional vertical machining and testing center (hereinafter referred to as ITP mechanism), a multi-degree-of-freedom tapping machine is installed on the machining head of the ITP.

[0033] (2) Install the satellite structure to be processed on the assembly turntable.

[0034] (3) Install the tap tool for thread tapping on the quick-change joint on the tapping machine.

[0035] (4) Using the assembly turntable, adjust the surface to be processed of the satellite structure so that the surface to be processed faces the tap side.

[0036] (5) The ITP is used to move the tap to the vicinity of the star, and the tapping machine's robotic arm is precisely controlled to align the tap above the structural hole to be tapped. The tapping operation of the light hole is completed using the tapping machine.

[0037] (6) After completing the tapping operation, remove the tap and replace it with a wire screw insert positioning rod. Install the wire screw insert limit block and the wire screw insert to be installed on the wire screw insert positioning rod in sequence.

[0038] (7) Use a tapping machine to complete the final wire thread sleeve installation operation.

[0039] In the scheme provided in the embodiment of the present invention, the equipment used includes: 1. Satellite structure body, 2. Assembly turntable, 3. ITP mechanism, 4. Multi-degree-of-freedom tapping machine, 5. Quick-change drill chuck, 6. Tap, 7. Wire thread insert positioning rod, 8. Double-nut wire thread insert limit block, 9. Wire thread insert.

[0040] like Figure 1 and Figure 2 The present invention provides a method for in-situ automatic tapping of threaded holes and automatic installation of wire screw sleeves, and the specific steps are as follows:

[0041] Step 1: Install a tapping machine 4 on the processing head of the ITP mechanism 3 for three-dimensional vertical processing and detection; the tapping machine 4 supports multiple degrees of freedom;

[0042] Step 2: Mount the satellite structure body 1 to be processed on the assembly turntable 2;

[0043] Step 3: Install a tap 6 tool for thread tapping on the quick-change drill chuck 5 at the end of the tapping machine 4;

[0044] Step 4: rotate the assembly turntable 2 to adjust the surface to be processed of the satellite structure body 1 to face the tool side of the tap 6;

[0045] Step 5: Use the ITP mechanism 3 to drive the tap 6 tool to move close to the satellite structure body 1, control the mechanical arm of the tapping machine 4, align the tap 6 tool above the structural hole to be tapped in the satellite structure body 1, and use the tapping machine 4 to complete the tapping operation of the light hole;

[0046] Step 6: After the tapping operation is completed, the tap 6 is removed, and the wire screw sleeve positioning rod 7 is installed on the tapping machine 4. The double-nut wire screw sleeve limiting block 8 and the wire screw sleeve 9 to be installed are installed on the wire screw sleeve positioning rod 7 in sequence;

[0047] Step 7: Use the ITP mechanism 3 to drive the tapping machine to complete the wire thread insert installation 9 operation.

[0048] Further, according to the length of the wire screw sleeve 9 to be installed, adjust the position of the double nut wire screw sleeve limit block 8, and the positioning length is the length of the wire screw sleeve + 1.2 to 1.5 times the pitch; in order to prevent scratches on the product surface, the double nut wire screw sleeve limit block is made of polytetrafluoroethylene, with an outer diameter of 10mm, an internal thread of M5 (taking ST5 wire screw sleeve as an example), and a thickness of 8mm.

[0049] In a possible implementation, the end surface of the wire screw insert positioning rod 7 is processed with a wire screw insert breaking handle positioning platform, the height of the positioning platform is 1 times the pitch, and the cross-section of the positioning platform is designed according to the parameters of the wire screw insert breaking handle. Taking the ST5 wire screw insert as an example, the breaking handle is located at 1 / 3 of the positioning rod diameter, and the positioning platform chamfer angle parameter is 30°±2° (see Figure 3 ) to ensure that after the wire screw sleeve is screwed onto the positioning rod, the broken handle is tightly positioned and fitted with the positioning platform on the end face of the wire screw sleeve positioning rod 7.

[0050] Optionally, in a possible implementation, the tapping depth and torque parameters are set in the tapping machine 4, and the torque is determined according to the material being processed. For example, when tapping the bottom hole of an ST5 wire screw sleeve on an aluminum alloy, the torque is set to 6 to 8 Nm.

[0051] Optionally, the wire screw sleeve positioning rod 7 is made of 45# steel, has a length of 100 mm, a clamping section diameter of 6 mm, a positioning section processed with M5 external thread (taking ST5 wire screw sleeve as an example), a thread length of 60 mm, and is smooth and burr-free.

[0052] In a possible implementation, the wire screw insert 9 is a common wire screw insert with a breaking groove.

[0053] In one possible implementation, the ITP mechanism 3 is utilized for its large operating range and high positioning accuracy, and is combined with the multi-degree-of-freedom tapping machine 4 to form an ultra-large and highly stable multi-degree-of-freedom thread tapping robot arm. The robot arm has an operating space of 6m×6m×3m, and in conjunction with the assembly turntable 2, it can realize tapping and wire screw installation operations on the five surfaces of the star.

[0054] In one possible implementation, the double-nut wire screw insert limit block 8 and the wire screw insert 9 to be installed are installed in sequence on the wire screw insert positioning rod 7, the number of turns of the tapping machine 4 is set (the number of turns of the wire screw insert installation + 1), and it is screwed in forward; after the wire screw insert 9 is installed in place, the tapping machine 4 is reversed and exited.

[0055] The method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts described in the present invention can replace the traditional method of manual tapping and installation of wire thread inserts on satellites, and can realize the tapping of threaded holes and automatic installation of wire thread inserts on satellites during the assembly of satellite structures, thereby reducing the difficulty and intensity of operators' on-satellite operations, improving the preparation accuracy, quality consistency and stability of threaded holes on satellites, and greatly improving the installation efficiency of wire thread inserts on satellites.

[0056] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0057] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts, characterized in that: include: A tapping machine (4) is installed on a processing head of an ITP mechanism (3) for three-dimensional vertical processing and detection; the tapping machine (4) supports multiple degrees of freedom; Mounting the satellite structure body (1) to be processed on an assembly turntable (2); A tap (6) for thread tapping is installed on a quick-change drill chuck (5) at the end of the tapping machine (4); Rotate the assembly turntable (2) to adjust the surface to be processed of the satellite structure body (1) toward the side of the tap (6); The ITP mechanism (3) is used to drive the tap (6) to move close to the satellite structure body (1), and the mechanical arm of the tapping machine (4) is controlled to align the tap (6) above the structural hole to be tapped of the satellite structure body (1), and the tapping machine (4) is used to complete the tapping operation of the light hole; After the tapping operation is completed, the tap (6) is removed, and a wire screw insert positioning rod (7) is installed on the tapping machine (4). A double-nut wire screw insert limiting block (8) and a wire screw insert (9) to be installed are sequentially installed on the wire screw insert positioning rod (7); The ITP mechanism (3) is used to drive the tapping machine to complete the installation operation of the wire thread sleeve (9).

2. A method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts according to claim 1, characterized in that: According to the length of the wire screw sleeve (9) to be installed, the position of the double-nut wire screw sleeve limit block (8) is adjusted, and the positioning length is the length of the wire screw sleeve (9) + 1.2 to 1.5 times the pitch.

3. A method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts according to claim 2, characterized in that: The double-nut wire screw sleeve limit block (8) is made of polytetrafluoroethylene, has an outer diameter of 10 mm, an internal thread of M5, and a thickness of 8 mm.

4. A method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts according to claim 1, characterized in that: The end surface of the wire screw insert positioning rod (7) is processed with a positioning platform for the wire screw insert (9) breaking handle, the height of the positioning platform is 1 times the pitch, and the cross section of the positioning platform is designed according to the parameters of the wire screw insert (9) breaking handle.

5. A method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts according to claim 4, characterized in that: When the model of the wire screw insert (9) is ST5, the position of the breaking handle is at 1 / 3 of the diameter of the wire screw insert positioning rod (7), and the positioning platform chamfer angle parameter is 30°±2°, so as to ensure that the breaking handle and the positioning platform at the end face of the wire screw insert positioning rod (7) are tightly positioned and fitted after the wire screw insert (9) is screwed onto the positioning rod.

6. The method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts according to claim 1, characterized in that: The tapping depth and torque parameters of the tapping machine (4) are determined according to the material being processed.

7. The method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts according to claim 1, characterized in that: The wire screw sleeve positioning rod (7) is made of 45# steel, has a length of 100 mm, a clamping section diameter of 6 mm, and a positioning section processed with an M5 external thread, a thread length of 60 mm, and is smooth and burr-free.

8. The method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts according to claim 1, characterized in that: The wire screw sleeve (9) is a wire screw sleeve with a breaking groove.

9. The method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts according to claim 1, characterized in that: The ITP mechanism (3) and the tapping machine (4) form a multi-degree-of-freedom thread tapping robot arm, the operating space of which is 6m×6m×3m, and cooperates with the assembly turntable (2) to realize the tapping of the five surfaces of the star body and the installation of the wire screw sleeve (9).

10. The method for in-situ automatic tapping of threaded holes and automatic installation of wire thread inserts according to claim 1, characterized in that: The double-nut wire screw sleeve limiting block (8) and the wire screw sleeve (9) to be installed are sequentially installed on the wire screw sleeve positioning rod (7), and the number of turns of the tapping machine (4) is set, and the wire screw sleeve (9) is screwed in forward; after the wire screw sleeve (9) is installed in place, the tapping machine (4) is reversed and withdrawn; the number of turns of the tapping machine (4) is the number of turns of the wire screw sleeve (9) installed + 1.

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