A spring tool holder for assisting in turning the welding groove of cylindrical thin-walled parts

Abstract

The present invention discloses a spring tool holder for assisting in turning the welding groove of cylindrical thin-walled parts. Before turning the cylinder, the feed lever transmission shaft is driven to rotate by rotating the handle. The feed lever transmission shaft is driven to rotate by key connection, and the feed screw is driven to rotate by threaded connection. The tool holder is controlled to reach a predetermined position by rotating the handle and recording the numerical value of the scale circle. When preparing to turn the cylinder, the slider is pulled outward for a certain distance, and the outer ring of the slider is brought into contact with the inner wall of the cylinder. Since the tension spring is always subjected to tension, the outer ring and the inner wall of the cylinder will always keep in contact during the turning process. During the rotation of the cylinder, the slider tool and related connecting parts change position with the different positions of the inner wall of the cylinder contacted by the outer ring of the slider, thereby ensuring the stability and consistency of the structure of the welding groove of the turned cylinder. It is used to assist in the mechanical processing of cylindrical thin-walled parts, and solves the problem that the outlet of cylindrical thin-walled parts is severely deformed and cannot be directly machined for groove.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a spring tool holder for assisting in turning welding grooves of cylindrical thin-wall parts. Background Art

[0002] At present, the metal combustion chamber shell of solid rocket engines is welded and spliced ​​between shell segments and cylinders. The welding quality between cylinders and shell segments, and between cylinders and cylinders determines a series of key performance indicators such as the ability of the combustion chamber shell to withstand internal pressure and sealing. The welding joint between cylinders generally adopts the joint form of butt joints. The characteristics of butt joints are uniform heating, symmetrical force, easy to ensure welding quality, and the groove form of the welding groove is V-shaped. The structural state of the cylinder welding groove determines the quality of product welding. Generally speaking, metal cylinders are welded and formed into combustion chamber shells after spinning, annealing, and machining. After the cylinder of a combustion chamber shell is spun, the cylinder port is severely deformed. Although the inner support tooling is installed at the mouth of the cylinder, the cylinder welding groove state cannot be guaranteed to be consistent when the groove is turned. It must be improved by manual grinding after machining. However, this process method not only has quality risks for the product, but also requires manual secondary grinding, which is time-consuming and labor-intensive.

[0003] By searching for relevant patents on the forming of cylindrical welding grooves, people have taken different measures to solve this problem. Invention patent publication number CN 106238764 A is a cylindrical port turning processing internal support tooling. The tooling can realize the correction and rounding of the spun cylinder through the relative movement of multiple ejector rods, multiple transmission rods and the mandrel. The product is evenly stressed during use, and can effectively improve the rigidity and processing accuracy of the thin-walled cylinder port. However, although the tooling improves the rigidity of the cylinder port, there is still the problem of port deformation. The groove still needs to be manually polished after machining. Therefore, although the tooling can improve the processing accuracy of the groove, it cannot completely solve the problem. Invention patent publication number CN102794334 A is a method for controlling the diameter size and shape accuracy of a thin-walled cylinder of a rocket combustion chamber shell. The invention uses a special hot expansion core mold to perform quantitative hot expansion with appropriate plastic stretching on thin-walled cylinders. The diameter size control is better. The invention proposes a method for controlling the precision of the cylinder size, but does not solve the factor of product hole deformation caused by cylinder clamping, so it still cannot solve the instability of groove turning. Patent Publication No. CN 213438497 U A clamping tool for thin-walled cylindrical parts, which can ensure the roundness, coaxiality and wall thickness of the cylinder, and avoid deformation caused by clamping and turning. However, the clamping position of the tool is at both ends of the cylinder, which overlaps with the groove turning position, so it is not suitable for solving this problem.

[0004] For the forming of the metal combustion chamber shell segment, the forming process currently used is cylinder spinning-annealing-machining-grinding-welding-shell segment forming. The cylinder has the following disadvantages after annealing:

[0005] 1) After the cylinder is annealed, the hole position is severely deformed. Although the welding groove is manually polished after turning, the hole welding groove still has quality defects, which leaves quality risks for subsequent product welding and makes quality assurance difficult.

[0006] 2) The cylinder must be manually polished after machining, and the hole diameter is large, the polishing range is large, and manual participation is high, resulting in low overall processing efficiency.

[0007] By inventing a spring tool holder for assisting in turning the welding groove of thin-walled cylindrical parts, the turning tool can change with the deformation position of the cylinder during turning. This tooling not only improves the machining accuracy of the cylinder machining welding groove, but also eliminates manual grinding, greatly improving the efficiency of cylinder machining. Summary of the invention

[0008] Technical Problems to be Solved by the Invention

[0009] The invention provides a spring tool holder for assisting in turning welding grooves of cylindrical thin-walled parts, which is used for assisting in the mechanical processing of cylindrical thin-walled parts to solve the problem that the outlets of cylindrical thin-walled parts are severely deformed and cannot be directly machined for grooves.

[0010] To solve the technical problem, the present invention adopts the technical solution

[0011] A spring tool holder for assisting in turning the welding groove of cylindrical thin-walled parts, comprising: an end cover 6, a force adjusting bolt 7, a feed screw 9, a retaining ring 10, a key 11, an outer ring 12, an inner ring 13, a shaft 15, a radial ball bearing 17, a tool holder 18, a tool holder body 19, a slider 20, a tension spring 22, a slider end cover 23 and a feed screw transmission shaft 25.

[0012] One end of the force adjusting bolt 7 is connected to the slider end cover 23 through a thread, and the step surface and the outer cylindrical surface of the other end are both clearance-matched with the end cover 6;

[0013] The end cover 6 is fixedly connected to the tool holder body 19, and the tool holder body 19 is fixed by the machine tool turret;

[0014] One end of the feed screw 9 is connected to the feed screw transmission shaft 25 through a key 11, and the other end is fixedly connected to the slider end cover 23 through a retaining ring 10;

[0015] The inner ring 13 and the outer ring 12 are clearance-fitted, and the outer spherical surface of the inner ring and the inner profile surface of the outer ring are clearance-fitted;

[0016] The inner hole of the inner ring 13 and the outer circle of the radial ball bearing 17 are interference fit, the radial ball bearing 17 and the shaft 15 are clearance fit, and the shaft 15 and the upper and lower holes of the slider 20 are interference fit;

[0017] One end of the slider end cover 23 is threadedly connected to the force adjusting bolt 7, fixed to the feed screw 9 through the retaining ring 10 in the middle, and the other end is connected to the slider 20;

[0018] The middle part of the feed screw transmission shaft 25 is clearance-matched with the force adjusting bolt 7 and is connected to the feed screw 9 via a key 11;

[0019] The center hole of the tool holder 18 is connected to the feed screw 9 through a thread;

[0020] One end of the tension spring 22 is fixedly connected to the tool holder body 19 via a stud, and the other end is fixed to the slide block 20 via a stud.

[0021] Furthermore, it also includes a handle 1 and a scale ring 3, wherein the handle 1 and the scale ring 3 are fixed to the feed screw transmission shaft 25 through a cylindrical pin 2, and quantitative control of the feed amount of the turning tool can be achieved by rotating the handle and recording the value of the scale ring.

[0022] Furthermore, the shaft 15 and the inner hole of the slider 20, the inner hole of the radial ball bearing 17 and the outer circle of the shaft 15, and the outer circle of the bearing 17 and the inner ring 13 are all interference fits, ensuring that the contact position between the outer ring and the inner wall of the cylinder remains unchanged.

[0023] Furthermore, the slider end cover 23 is integrated with the slider 20 and the retaining ring 10 as an integral component, and their relative positions do not change.

[0024] Technical effects obtained by the present invention

[0025] The present invention introduces a spring tool holder without supporting the end of the cylinder, so that the turning tool changes with the position of the cylinder, greatly improving the accuracy and quality of the cylinder welding groove after turning, and eliminating the need for manual grinding of the cylinder end. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 : The front view of the tooling of the present invention;

[0028] Figure 2 : A top view of the tooling of the present invention;

[0029] Figure 3 : A side view of the tooling of the present invention;

[0030] Figure 4 : Schematic diagram of the structure of the end cover; 4a is a front view, 4b is a side view;

[0031] Figure 5 : Schematic diagram of the structure of the force adjusting bolt; 5a is the front view, 5b is the top view;

[0032] Figure 6 : Schematic diagram of the structure of the feed screw; 6a is the front view, 6b is the top view;

[0033] Figure 7 : Schematic diagram of the structure of the tool holder; 7a is a front view, 7b is a left view, 7c is a right view, and 7d is a top view;

[0034] Figure 8 : Schematic diagram of the structure of the tool holder body, 8a is a front view, 8b is a left view, 8c is a right view, 8d is a bottom view;

[0035] Fig. 9 : Schematic diagram of the structure of the slider, 9a is a top view, 9b is a bottom view, 9c is a front view, and 9d is a left view;

[0036] Fig.10 : Schematic diagram of the structure of the slider end cover, 10a is a front view, 10b is a top view;

[0037] Fig.11 : Schematic diagram of the structure of the feed screw transmission shaft, 11a is a front view, 11b is a cross-sectional view;

[0038] Fig.12 : Structural diagram of inner and outer rings, 12a is a front view of the inner ring, 12b is a front view of the outer ring, and 12c is a top view of the outer ring;

[0039] Among them: 1-handle, 2-cylindrical pin 4×25, 3-scale ring, 4-cover, 5-countersunk screw M4×14, 6-end cover, 7-force adjusting bolt, 8-countersunk screw M5×18, 9-feed screw, 10-gear ring, 11-key, 12-outer ring, 13-inner ring, 14-wheel frame end cover, 15-shaft, 16-gap gasket, 17-radial ball bearing, 18-tool clamp, 19-tool holder body, 20-slider, 21-stud, 22-tension spring, 23-slider end cover, 24-countersunk screw M4×8, 25-feed screw transmission shaft, 26-tool holder body bottom plate, 27-countersunk screw M4×20, 28-square head flat end set screw. DETAILED DESCRIPTION

[0040] This patent invents a spring tool holder for assisting in turning the welding groove of thin-walled parts of a cylinder. On the one hand, before turning the cylinder, the feed lever transmission shaft is first rotated by rotating the handle, and the feed lever transmission shaft is rotated through the key connection to drive the feed screw to rotate, and the feed screw is rotated through the threaded connection to drive the tool holder to move forward or backward. Then, by rotating the handle and recording the scale circle value, the turning tool can be controlled to reach the predetermined position. On the other hand, when preparing to turn the cylinder, the slider is pulled outward for a certain distance, and the outer ring of the slider is kept in contact with the inner wall of the cylinder. Since the tension spring is always under tension, the outer ring and the inner wall of the cylinder will always keep in contact during the turning process. Then the lathe spindle rotates, so that the turning tool slowly approaches the cylinder, and the cylinder can be slowly turned. Through the action of related fasteners and transmission mechanisms, the slider structure and the tool holder can undergo the same position change. In this way, during the rotation of the cylinder, the slider turning tool and related connecting parts will undergo corresponding position changes as the position of the inner wall of the cylinder contacted by the outer ring of the slider is different, which ensures the stability and consistency of the turning cylinder welding groove structure. Finally, after repeated adjustments and measurements, the welding groove structure required by the design can be turned out.

[0041] In order to make the purpose, features and advantages of the technical solution proposed by the present invention more obvious and easy to understand, the following will be combined with the attached Figure 1 -Attached Fig.12 , clearly and completely describe the embodiments of the technical solution proposed in the present invention. Obviously, the described embodiments are only part of the embodiments of the proposed technical solution, not all of them. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0042] The present invention discloses a spring tool holder for assisting in turning the welding groove of thin-walled cylindrical parts. The present embodiment is used for turning the welding groove of the port of a φ1400×δ3.8 thin-walled cylinder. The inner diameter of the cylinder is φ1400 and the wall thickness is 3.8 mm. The design drawing requires the welding groove to be processed at the port. The inclination of the welding groove is required to be 40° and the blunt edge size of the groove is 1+0.2 0. However, after the cylinder is annealed by spinning, defects such as local deformation exist at the port.

[0043] The main key components of the spring tool holder include the end cover 6, the force adjusting bolt 7, the feed screw 9, the outer ring 12, the inner ring 13, the tool clamp 18, the tool holder body 19, the slider 20, the slider end cover 23, the feed screw transmission shaft 25 and other components.

[0044] The end cover 6 is a square structure, one end of which is fixed to the tool holder body 19 by 4 screws M5×10, and the other end is fixed to the cover 4 by 4 screws M4×14, and the three are integrated, and finally the tool holder body is fixed by the machine tool turret. The center of the end cover is a center hole, and the center hole is clearance-matched with the outer cylindrical surface of the feed screw transmission shaft 25.

[0045] The force adjusting bolt 7 is a cylindrical rotating body, one end of which is connected to the slider end cover 23 through a thread, and the step surface and the outer cylindrical surface of the other end are both clearance-matched with the end cover 6, which can move relative to the end cover to play the role of adjusting force.

[0046] One end of the feed screw 9 is connected to the feed screw transmission shaft 25 through a key 11, and force can be transmitted. The two ends are fixed to the slider end cover 23 through a retaining ring 10 and 4 screws m4×8.

[0047] The slider end cover 23 is a cylindrical rotating body, which plays a connecting role. One end of it is threadedly connected to the force adjusting bolt 7, and the middle is fixed to the feed screw 9 through a retaining ring and screws m4×8, and the other end is connected to the slider through 4 M5×18 countersunk screws. Finally, the slider end cover 23 and the slider 20, retaining ring 10 and 4 screws m4×8, 4 M5×18 are integrated into one component, and the relative position does not change.

[0048] The right end of the feed screw transmission shaft 25 is fixed to the scale ring 2 and the handle 1 by two cylindrical pins, and the relative positions of the three do not change. The middle part of the transmission shaft is matched with the force adjustment bolt and is connected to the feed screw 9 by a key.

[0049] The inner ring 13 and the outer ring 12 are clearance fit, and the outer spherical surface of the inner ring and the inner profile of the outer ring are clearance fit. Since the position of the axis direction is restricted, the two will not fall off. The inner hole of the inner ring and the outer circle of the radial ball bearing 17 are interference fit, and the radial ball bearing and the shaft 15 are clearance fit. When the outer ring rotates, the inner ring and the bearing are both movable parts. The shaft 15 and the upper and lower holes of the slider are interference fit to prevent the shaft 15 from falling off from the upper and lower holes of the slider.

[0050] The center hole of the tool holder 18 is connected to the feed screw 9 through a thread. When the feed screw is rotated, the tool holder will move forward or backward. The turning tool is fixed to the tool holder through two screws M10×35 (28) and the threaded hole on the front of the tool holder. The actual position of the turning tool can be adjusted by adjusting the tension screw.

[0051] The specific workflow is as follows:

[0052] First, clamp the cylinder and the lathe spindle, calculate the theoretical distance between the turning tool and the outer ring of the slider according to the design size, and then rotate the handle 1 to move the turning tool to the predetermined position. The specific working principle is: rotating the handle 1 drives the feed lever transmission shaft 25 to rotate, and the transmission shaft drives the feed screw 9 to rotate through the key connection. The rotation of the feed screw 9 can drive the tool holder to move forward or backward. At this time, the turning tool and the tool holder have been fastened by two screws M10. Then by rotating the handle and observing the scale circle, you can control the turning tool to have a certain feed forward or backward, and finally adjust the turning tool to move to the predetermined position.

[0053] Before turning, pull the slider 20 outward a certain distance to keep the tension spring in a taut state. Adjust the position of the tool holder so that the outer ring 12 on the pulled slider contacts the inner hole of the cylinder, then rotate the lathe spindle, slowly bring the turning tool close to the outer circle of the cylinder, and repeatedly measure to turn the welding groove required by the design. The specific working principle is: during the turning and rotation of the cylinder, the outer ring on the slider always keeps in contact with the inner wall of the cylinder due to the action of the spring tension. The outer ring and the inner ring are in spherical contact, and the inner ring and the pin are connected with a radial ball bearing, which ensures that the cylinder always keeps point contact with the outer ring during rotation. During the machining process, due to deformation at a certain position of the cylinder port, the outer ring 12 changes with the change of the position of the inner wall of the cylinder, and the tension spring will also undergo an elastic change x, and the outer ring changes in accordance with the inner wall of the cylinder. From the analysis of the above structure, it can be seen that the slider end cover 23 and the slider 20, the retaining ring 10 and the 4 screws M4×8 and 4 screws M5×18 are integrated as one component, and the relative positions do not change. The feed screw does not change position with the tool holder and the slider end cover when it does not rotate. Therefore, when the position of the cylinder port changes due to deformation, the slider and the turning tool will also change in the same position due to the action of the tension spring, thereby ensuring that the structure at each welding groove of the cylinder is consistent.

[0054] The tooling of the invention has been put into product processing, and the scheme has been proven to be feasible. The tooling of the invention is used for turning the welding groove of the port of a φ1400×δ3.8 thin-walled cylinder. The product inspection results show that the precision and quality of the welding groove have been significantly improved, and no secondary manual grinding is required. The invention ensures that the welding groove structure of the thin-walled cylindrical parts after machining is consistent, effectively improves the machining quality of the product, and also lays a solid foundation for the subsequent product welding.

Claims

1. A spring tool holder for assisting in turning the welding groove of cylindrical thin-walled parts, characterized in that: include: An end cover (6), a force adjusting bolt (7), a feed screw (9), a retaining ring (10), a key (11), an outer ring (12), an inner ring (13), a shaft (15), a radial ball bearing (17), a tool holder (18), a tool holder body (19), a slide block (20), a tension spring (22), a slide block end cover (23) and a feed screw transmission shaft (25), One end of the force adjusting bolt (7) is connected to the slider end cover (23) through a thread, and the step surface and the outer cylindrical surface of the other end are both clearance-matched with the end cover (6); The end cover (6) is fixedly connected to the tool holder body (19), and the tool holder body (19) is fixed by a machine tool turret; One end of the feed screw (9) is connected to the feed screw transmission shaft (25) via a key (11), and the other end is fixedly connected to the slider end cover (23) via a retaining ring (10); The inner ring (13) and the outer ring (12) are clearance-fitted, and the outer spherical surface of the inner ring and the inner profile surface of the outer ring are clearance-fitted; The inner hole of the inner ring (13) and the outer circle of the radial ball bearing (17) are interference fit, the radial ball bearing (17) and the shaft (15) are clearance fit, and the shaft (15) and the upper and lower holes of the slider (20) are interference fit; One end of the slider end cover (23) is threadedly connected to the force adjusting bolt (7), fixed to the feed screw (9) via a retaining ring (10) in the middle, and the other end is connected to the slider (20); The middle part of the feed screw transmission shaft (25) is clearance-matched with the force adjusting bolt (7) and is connected to the feed screw (9) via a key (11); The center hole of the tool holder (18) is connected to the feed screw (9) via a thread; One end of the tension spring (22) is fixedly connected to the tool holder body (19) through a stud, and the other end is fixed to the slide block (20) through a stud.

2. The spring tool holder for assisting in turning the welding groove of cylindrical thin-walled parts according to claim 1 is characterized in that: The invention also comprises a handle (1) and a graduated ring (3), wherein the handle (1) and the graduated ring (3) are fixed to a feed screw transmission shaft (25) via a cylindrical pin (2), and quantitative control of the feed amount of the turning tool can be achieved by rotating the handle and recording the value of the graduated ring.

3. The spring tool holder for assisting in turning the welding groove of cylindrical thin-walled parts according to claim 1, characterized in that: The shaft (15) and the inner hole of the slider (20), the inner hole of the radial ball bearing (17) and the outer circle of the shaft (15), and the outer circle of the bearing (17) and the inner ring (13) are all interference fits, ensuring that the contact position between the outer ring and the inner wall of the cylinder remains unchanged.

4. The spring tool holder for assisting in turning the welding groove of cylindrical thin-walled parts according to claim 1 is characterized in that: The slider end cover (23), the slider (20) and the retaining ring (10) are integrally formed into an integrated component, and their relative positions do not change.

5. The spring tool holder for assisting in turning the welding groove of cylindrical thin-walled parts according to claim 1, characterized in that: The end cover (6) is a square structure.

6. The spring tool holder for assisting in turning the welding groove of cylindrical thin-walled parts according to claim 1, characterized in that: The force adjusting bolt (7) is a cylindrical rotating body structure.

7. The spring tool holder for assisting in turning the welding groove of cylindrical thin-walled parts according to claim 1, characterized in that: The slider end cover (23) is a cylindrical rotating body structure.

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