A clamping tooling for deep-hole housing and a processing method for deep-hole housing

Abstract

The present invention relates to a clamping tooling for a deep-hole housing and a processing method for the deep-hole housing, belonging to the technical field of missile weapon engine components. The problem to be solved is the low processing efficiency and the difficulty in ensuring the consistency of processing accuracy. It includes an eccentric chuck, a housing positioning disc, a gland, a first pin shaft and a second pin shaft. A circular groove is machined on the eccentric chuck, and the second pin shaft is arranged in the circular groove. A positioning hole is machined on the housing positioning disc, and the housing positioning disc is arranged in the circular groove. The positioning hole is fitted and installed with the second pin shaft. There is a first pin shaft on the housing positioning disc, and a first hole is connected to the first pin shaft. The deep-hole housing is coaxially arranged with the housing positioning disc, and a gland is sleeved on the deep-hole housing, and the gland presses the deep-hole housing tightly. The present invention facilitates the clamping and disassembly of workpieces; keeps the center of gravity of the eccentrically clamped workpiece coincident with the rotating shaft on the equipment, reduces tremors, ensures stable movement during the workpiece processing, achieves better surface quality and dimensional accuracy, and lays a foundation for the subsequent technical indicators to be achieved.

Description

Technical Field

[0001] The present invention relates to a clamping tool for a housing and a processing method for the housing, belonging to the technical field of missile weapon engine components. Background Art

[0002] The deep-hole housing is an important component in a missile weapon engine, which is usually processed from materials such as titanium alloy. With the continuous upgrading of weapon equipment, the performance requirements for the engine are continuously increasing. To ensure that the flying weapon can fully exert its service function and stability in a harsher environment, and to reduce the comprehensive cost of mass-produced products, the research on using other materials to replace titanium alloy has gradually started and entered the experimental stage.

[0003] The deep-hole housing has an eccentric structure. During the research and development process, there is a phenomenon that the center of mass of the workpiece does not coincide with the rotation center of the processing equipment. In addition, the shape tolerance and position tolerance requirements are strict. During the processing of the surface of the deep cavity feature, the tremor phenomenon is serious, and it is extremely easy to generate deformation. It is difficult to guarantee the dimensional and geometric tolerances, and the processing efficiency is low and the consistency of the processing accuracy is difficult to guarantee.

[0004] Based on the above problems, it is urgent to propose a clamping tool for a deep-hole housing and a processing method for the deep-hole housing to solve the above technical problems. Summary of the Invention

[0005] The present invention provides a clamping tool for a deep-hole housing and a processing method for the deep-hole housing. The problem solved by the research and development of the present invention is the low processing efficiency and the difficulty in guaranteeing the consistency of the processing accuracy. A brief overview of the present invention is given below to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify the key or important parts of the present invention, nor is it intended to limit the scope of the present invention.

[0006] Technical Solution of the Present Invention

[0007] Solution 1: A clamping tool for a deep-hole housing, including an eccentric chuck, a housing positioning disc, a gland, a first pin shaft, and a second pin shaft. A circular groove is machined on the eccentric chuck, and the second pin shaft is arranged in the circular groove of the eccentric chuck. A positioning hole is machined on the housing positioning disc, and one end of the housing positioning disc is arranged in the circular groove, and the positioning hole of the housing positioning disc is fitted and installed with the second pin shaft. The housing positioning disc is provided with the first pin shaft, the first hole at the left end of the deep-hole housing is connected with the first pin shaft, the deep-hole housing is coaxially arranged with the housing positioning disc, a gland is sleeved on the deep-hole housing, and the gland presses the left end of the deep-hole housing.

[0008] Preferably: the number of positioning holes is three, the eccentric chuck and the housing positioning plate are connected by three positioning bolts arranged in a circular array, spring washers are mounted on the screws, the pressure cover is connected to the housing positioning plate by screws, the positioning bolts are cylindrical head hexagon socket bolts, and avoidance holes are processed at the corresponding positions of the pressure cover and the positioning bolts.

[0009] Preferably, the number of the first pin shafts is two, the two first pin shafts are plugged into the housing positioning disk, and the first pin shafts are arranged corresponding to the first holes at the end of the deep hole housing.

[0010] Solution 2: A method for processing a deep hole shell, comprising the following steps:

[0011] Step 1: Cutting materials;

[0012] Step 2: Rough turn the outer wall of the workpiece, leaving a machining allowance on one side;

[0013] Step 3: Semi-finish turning the outer wall of the workpiece, leaving a machining allowance on one side;

[0014] Step 4: Boring the left end surface of the workpiece to process two symmetrically arranged first holes and two symmetrically arranged second holes;

[0015] Step 5: Connect the clamping tool of the deep hole shell holding the workpiece to the lathe through the eccentric chuck, and process the deep hole structure at the eccentric position of the right end face of the workpiece; use the clamping tool of the deep hole shell in Scheme 1 to clamp the workpiece;

[0016] Step 6: After removing the workpiece, use a three-jaw chuck to clamp it, and finish turning the annular sealing groove and external thread on the outer wall of the workpiece;

[0017] Step 7: Finish milling the first hole and the second hole on the left end face of the workpiece;

[0018] Step 8: Finish milling radial air holes;

[0019] Step 9: Use a rolling cutter to roll three deep hole structures and process the inner circular hole on the right end;

[0020] Step 10: Finish milling the left end face;

[0021] Step 11: Finish turning the left end face of the workpiece;

[0022] Step 12: Check the dimensions and complete the deep hole shell processing.

[0023] Preferably: in step 2, the machining allowance reserved on one side is 1 mm, ensuring that the coaxiality of the entire deep hole shell is less than 0.05 mm and the parallelism of the end faces on both sides is 0.05;

[0024] In step three, a machining allowance of 0.5 mm is reserved on one side to ensure that the coaxiality of the entire deep-hole housing is less than 0.05 mm, and the parallelism of the two end faces is 0.05;

[0025] In step five, the boring tool or drilling tool is aligned with the eccentric position of the workpiece, and the first deep-hole structure is machined at the eccentric position of the workpiece. After the machining is completed, a tool is used to pass through the avoidance hole to disassemble the positioning bolt, ensuring that the clamping position of the workpiece remains unchanged, separating the housing positioning disc from the eccentric chuck, rotating the housing positioning disc, connecting another positioning hole on the housing positioning disc to the second pin shaft, rotating the workpiece by 120°, machining the second deep-hole structure, disassembling and rotating the housing positioning disc, rotating the workpiece by another 120°, and machining the third deep-hole structure. A machining allowance of 0.05 mm is reserved for the deep-hole structure;

[0026] In step six, rotate the screw to separate the gland from the housing positioning disc to complete the disassembly of the workpiece;

[0027] Or rotate the positioning bolt to separate the housing positioning disc from the eccentric chuck, place the disassembled part in a horizontal position, and then rotate the screw to separate the gland from the housing positioning disc to complete the disassembly of the workpiece;

[0028] In step nine, ensure that the deep hole meets the requirements of cylindricity of 0.01 mm and surface roughness of 0.8;

[0029] In step eleven, ensure that the deviation between the center of rotation of the left end face of the deep-hole housing and the axis is less than 0.005.

[0030] Preferably: In step twelve, before detecting the dimensions, the workpiece needs to be electrically engraved with a serial number; after detecting the dimensions, the deep-hole housing is cleaned and then stored in the warehouse.

[0031] Preferably: The deep-hole housing is a small-sized deep-hole stainless-steel housing. The three deep-hole structures are the areas where the valve stem reciprocates, and the depth of the deep-hole structure is 80 mm.

[0032] Preferably: In step five, a lathe equipment is used in cooperation with the clamping fixture of the deep-hole housing to rough-machine the deep-hole structure, ensuring the position accuracy of the three deep-hole structures and the surface quality of the bottom hole.

[0033] The present invention has the following beneficial effects:

[0034] The present invention facilitates the clamping and disassembly of the workpiece; through the function of adjusting the moment of inertia by the clamping fixture of the deep-hole housing, the center of gravity of the eccentrically clamped workpiece is kept coincident with the rotating shaft on the equipment, reducing tremors, ensuring stable movement during the machining of the workpiece, achieving better surface quality and dimensional accuracy, and laying a foundation for the subsequent technical indicators. Brief Description of the Drawings

[0035] Figure 1It is a side view of a clamping tool for a deep-hole housing;

[0036] Figure 2 It is Figure 1 the A-A sectional view of;

[0037] Figure 3 It is the clamping process diagram of the workpiece;

[0038] Figure 4 It is an exploded view of a clamping tool for a deep-hole housing;

[0039] Figure 5 It is a three-dimensional view of the deep-hole housing;

[0040] Figure 6 It is a side view of the deep-hole housing.

[0041] In the figure: 1 - eccentric chuck, 2 - housing positioning disk, 3 - gland, 4 - screw, 5 - spring washer, 6 - first pin shaft, 7 - second pin shaft, 8 - deep-hole housing, 11 - circular groove, 20 - positioning bolt, 21 - positioning hole, 30 - avoidance hole, 81 - first hole, 82 - second hole, 83 - radial air hole, 84 - deep-hole structure. Specific embodiments

[0042] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be described below through specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0043] The connections mentioned in the present invention are divided into fixed connections and detachable connections. The fixed connection is an undetachable connection, including but not limited to conventional fixed connection methods such as hemming connection, rivet connection, bonding connection, and welding connection. The detachable connection includes but not limited to conventional disassembly methods such as screw connection, snap connection, pin connection, and hinge connection. When the specific connection method is not clearly defined, it is defaulted that at least one connection method can always be found among the existing connection methods to achieve this function, and those skilled in the art can select according to their needs. For example: welding connection is selected for the fixed connection, and hinge connection is selected for the detachable connection.

[0044] Specific embodiment one: In combination with Figures 1 - 6To describe this embodiment, a clamping tool for a deep-hole housing in this embodiment includes an eccentric chuck 1, a housing positioning disk 2, a gland 3, a first pin 6, and a second pin 7. A circular groove 11 is machined on the eccentric chuck 1. The second pin 7 is arranged in the circular groove 11 of the eccentric chuck 1. A positioning hole 21 is machined on the housing positioning disk 2. One end of the housing positioning disk 2 is arranged in the circular groove 11, and the positioning hole 21 of the housing positioning disk 2 is installed in cooperation with the second pin 7. The housing positioning disk 2 is provided with the first pin 6. One end of the first pin 6 is arranged in the first hole 81 at the left end of the deep-hole housing 8. The deep-hole housing 8 is coaxially arranged with the housing positioning disk 2. A gland 3 is sleeved on the deep-hole housing 8, and the gland 3 presses the left end of the deep-hole housing 8.

[0045] The number of the positioning holes 21 is three. The eccentric chuck 1 and the housing positioning disk 2 are connected by three positioning bolts 20 arranged in a circumferential array. A spring washer 5 is sleeved on the screw 4. The gland 3 is connected to the housing positioning disk 2 through the screw 4. The positioning bolt 20 is a cylinder head socket head cap screw. Avoidance holes 30 are machined at the corresponding positions of the gland 3 and the positioning bolts 20.

[0046] The number of the first pins 6 is two. The two first pins 6 are inserted into the housing positioning disk 2, and the first pins 6 are correspondingly arranged with the first holes 81 at the ends of the deep-hole housing 8.

[0047] This device can adjust the moment of inertia of the eccentric numerically controlled lathe. This device is mainly a rotary structure. By adding counterweights, the moment of inertia is adjusted, which is convenient and flexible during use.

[0048] Specific embodiment two: Combine Figures 1 - 6 To describe this embodiment, a processing method for a deep-hole housing in this embodiment includes an eccentric chuck 1, a housing positioning disk 2, a gland 3, a first pin 6, and a second pin 7. A circular groove 11 is machined on the eccentric chuck 1. The second pin 7 is arranged in the circular groove 11 of the eccentric chuck 1. A positioning hole 21 is machined on the housing positioning disk 2. One end of the housing positioning disk 2 is arranged in the circular groove 11, and the positioning hole 21 of the housing positioning disk 2 is installed in cooperation with the second pin 7. The housing positioning disk 2 is provided with the first pin 6. The first hole 81 at the left end of the deep-hole housing 8 is connected to the first pin 6. The deep-hole housing 8 is coaxially arranged with the housing positioning disk 2. A gland 3 is sleeved on the deep-hole housing 8, and the gland 3 presses the left end of the deep-hole housing 8. The eccentricity between the eccentric chuck 1 and the housing positioning disk 2 is 9 mm ± 0.01.

[0049] The number of the positioning holes 21 is three. The eccentric chuck 1 and the housing positioning disk 2 are connected by three positioning bolts 20 arranged in a circumferential array. A spring washer 5 is sleeved on the screw 4. The gland 3 is connected to the housing positioning disk 2 through the screw 4. The positioning bolt 20 is a cylinder head socket head cap screw. Avoidance holes 30 are machined at the corresponding positions of the gland 3 and the positioning bolts 20.

[0050] The number of the first pin shafts 6 is two. The two first pin shafts 6 are inserted into the housing positioning disc 2, and the first pin shafts 6 are arranged corresponding to the first holes 81 at the end of the deep-hole housing 8.

[0051] It includes the following steps:

[0052] Step 1: Blanking;

[0053] Step 2: Rough-turn the outer wall of the workpiece, leaving machining allowance on one side.

[0054] In Step 2, the machining allowance left on one side is 1 mm, ensuring that the coaxiality of the workpiece is less than 0.05 mm, and the parallelism of the two end faces is 0.05.

[0055] Step 3: Semi-finish turn the outer wall of the workpiece, leaving machining allowance on one side. At this time, the workpiece is in the shape of a two-step shaft.

[0056] In Step 3, the machining allowance left on one side is 0.5 mm, ensuring that the coaxiality of the workpiece is less than 0.05 mm, and the parallelism of the two end faces is 0.05.

[0057] Step 4: Bore holes on the left end face of the workpiece to machine two symmetrically arranged first holes 81 and two symmetrically arranged second holes 82.

[0058] Step 5: Clamp the workpiece with the clamping fixture of the deep-hole housing. Connect the clamping fixture of the deep-hole housing with the workpiece to the lathe through the eccentric chuck 1. Machine the deep-hole structure 84 at the eccentric position on the right end face of the workpiece; that is, fit the first hole 81 with the second pin shaft 7, then sleeved the gland 3 on the workpiece through the central hole 31, and the gland 3 is detachably connected to the housing positioning disc 2 through the screw 4. The gland 3 and the housing positioning disc 2 clamp the left end of the workpiece to realize the fixation of the workpiece.

[0059] In Step 5, align the boring tool or drilling tool with the eccentric position of the workpiece, machine the first deep-hole structure 84 at the eccentric position of the workpiece. After machining, use a tool to pass through the avoidance hole 30 to disassemble the positioning bolt 20, ensure that the clamping position of the workpiece remains unchanged, separate the housing positioning disc 2 from the eccentric chuck 1, rotate the housing positioning disc 2 to connect another positioning hole 21 on the housing positioning disc 2 with the second pin shaft 7, rotate the workpiece by 120°, machine the second deep-hole structure 84, disassemble and rotate the housing positioning disc 2, rotate the workpiece by 120° continuously, machine the third deep-hole structure 84, and the machining allowance reserved for the deep-hole structure 84 is 0.05 mm.

[0060] In Step 5, a lathe equipment is used in cooperation with the clamping tooling of the deep-hole housing to rough-machine the deep-hole structure, ensuring the positional tolerance of the three deep-hole structures and the surface quality of the bottom hole; this lays a foundation for meeting the final dimensional requirements later. If the surface quality of the bottom hole fails to meet the requirements, the roughness of the deep-hole structure in Step 9 will not reach the requirement of 0.8.

[0061] The clamping tooling can increase the clamping area of the workpiece, facilitating the clamping and disassembly of the workpiece; through the function of adjusting the moment of inertia by the clamping tooling of the deep-hole housing 8, the center of gravity of the eccentrically clamped workpiece is kept coincident with the rotating shaft on the equipment, reducing tremors, ensuring stable movement during workpiece machining, achieving better surface quality and dimensional accuracy, and laying a foundation for the subsequent technical indicators to be achieved.

[0062] Step 6: After removing the workpiece, use a three-jaw chuck to clamp it, and finish-turn the annular sealing groove and external thread on the outer wall of the workpiece.

[0063] In Step 6, rotate the screw 4 to separate the gland 3 from the housing positioning disc 2 to complete the disassembly of the workpiece; or rotate the positioning bolt 20 to separate the housing positioning disc 2 from the eccentric chuck 1, place the disassembled part in a horizontal position, and then rotate the screw 4 to separate the gland 3 from the housing positioning disc 2 to complete the disassembly of the workpiece.

[0064] Step 7: Finish-mill the first hole 81 and the second hole 82 on the left end face of the workpiece.

[0065] Step 8: Finish-mill the radial air hole 83.

[0066] Step 9: Use a rolling tool to roll the three deep-hole structures 84 and machine the circular hole in the right-end inner cavity.

[0067] In Step 9, when using a rolling tool to perform finish machining on the deep-hole structure of the eccentric deep-hole housing 8, the quality stability is relatively high, the precision consistency is good, ensuring that the deep hole meets the requirements of cylindricity of 0.01 mm and roughness of 0.8, with low cost and high quality stability.

[0068] Step 10: Finish-mill the first hole 81 and the second hole 82 on the left end face.

[0069] Step 11: Finish-turn the left end face of the workpiece.

[0070] In Step 11, ensure that the deviation between the center of rotation of the left end face of the workpiece and the axis is less than 0.005.

[0071] Step 12: Engrave the serial number on the workpiece, detect the dimensions, complete the machining of the deep-hole housing 8, clean the deep-hole housing 8, and complete the warehousing.

[0072] The deep-hole housing 8 is a small-sized deep-hole stainless steel housing. The total length of the deep-hole housing 8 is 96 mm, and the maximum diameter of the deep-hole housing 8 is 62 mm. It can fully exert its service function and stability under harsh environments, and also reduce the comprehensive cost. The three deep-hole structures are the reciprocating motion areas of the valve stem. The depth of the deep-hole structure is 80 mm, and the shape tolerance and surface quality requirements are strict, solving the difficulties and key points of such products. The counterweight is detachably connected to the eccentric chuck 1 by bolts, and the counterweight is used according to the actual situation.

[0073] It should be noted that in the above embodiments, as long as the technical solutions do not conflict, they can be arranged and combined. Those skilled in the art can exhaust all possibilities based on the mathematical knowledge of permutations and combinations. Therefore, the present invention will no longer describe the technical solutions after permutation and combination one by one, but it should be understood that the technical solutions after permutation and combination have been disclosed by the present invention.

[0074] This embodiment is only an exemplary illustration of this patent and does not limit its protection scope. Those skilled in the art can also make partial changes to it. As long as it does not exceed the spiritual essence of this patent, it is within the protection scope of this patent.

Claims

1. A method for processing a deep hole shell, It is characterized in that The processing method is implemented based on a clamping tool for a deep hole shell, wherein the clamping tool for the deep hole shell comprises an eccentric chuck (1), a shell positioning disk (2), a pressure cover (3), a first pin shaft (6) and a second pin shaft (7); a circular groove (11) is processed on the eccentric chuck (1), a second pin shaft (7) is arranged in the circular groove (11) of the eccentric chuck (1), a positioning hole (21) is processed on the shell positioning disk (2), one end of the shell positioning disk (2) is arranged in the circular groove (11), and the positioning hole (21) of the shell positioning disk (2) is matched and installed with the second pin shaft (7); the shell positioning disk (2) has a first pin shaft (6), a first hole (81) at the left end of the deep hole shell (8) is connected to the first pin shaft (6), and the deep hole shell (8) is coaxial with the shell positioning disk (2). The deep hole shell (8) is provided with a pressure cover (3), and the pressure cover (3) presses the left end of the deep hole shell (8); the number of the positioning holes (21) is three, the eccentric chuck (1) and the shell positioning disk (2) are connected by three positioning bolts (20) arranged in a circumferential array, the screw (4) is provided with a spring washer (5), the pressure cover (3) is connected to the shell positioning disk (2) by the screw (4), the positioning bolt (20) is a cylindrical head hexagon socket bolt, and the pressure cover (3) and the positioning bolt (20) are processed with avoidance holes (30) at corresponding positions; the number of the first pin shafts (6) is two, the two first pin shafts (6) are plugged into the shell positioning disk (2), and the first pin shafts (6) are arranged corresponding to the first hole (81) at the end of the deep hole shell (8); the following steps are included: Step 1: Cutting materials; Step 2: Rough turning the outer wall of the workpiece, leaving a machining allowance on one side; the machining allowance on one side is 1 mm, ensuring that the coaxiality of the entire deep hole shell (8) is less than 0.05 mm, and the parallelism of the end faces on both sides is 0.05; Step 3: Semi-finish turning the outer wall of the workpiece, leaving a machining allowance on one side; leaving a machining allowance of 0.5mm on one side to ensure that the coaxiality of the entire deep hole shell is less than 0.05mm, and the parallelism of the end faces on both sides is 0.05; Step 4: boring the left end surface of the workpiece to machine two symmetrically arranged first holes (81) and two symmetrically arranged second holes (82); Step Five: Connect the clamping tooling for the deep-hole housing holding the workpiece to the lathe through the eccentric chuck (1), and machine a deep-hole structure (84) at the eccentric position on the right end face of the workpiece; use a clamping tooling for a deep-hole housing to hold the workpiece; align the boring tool or drilling tool with the eccentric position of the workpiece, machine the first deep-hole structure (84) at the eccentric position of the workpiece. After machining is completed, use a tool to pass through the avoidance hole (30) to disassemble the positioning bolt (20), ensure that the clamping position of the workpiece remains unchanged, separate the housing positioning disk (2) from the eccentric chuck (1), rotate the housing positioning disk (2) so that another positioning hole (21) on the housing positioning disk (2) is connected to the second pin shaft (7), rotate the workpiece by 120°, machine the second deep-hole structure (84), disassemble and rotate the housing positioning disk (2), rotate the workpiece by another 120°, machine the third deep-hole structure (84), and leave a machining allowance of 0.05 mm for the deep-hole structure (84); Step Six: After removing the workpiece, use a three-jaw chuck to clamp and machine an annular sealing groove and an external thread on the outer wall of the workpiece; rotate the screw (4) to separate the gland (3) from the housing positioning disk (2) to complete the disassembly of the workpiece; or rotate the positioning bolt (20) to separate the housing positioning disk (2) from the eccentric chuck (1), place the disassembled part in a horizontal position, and then rotate the screw (4) to separate the gland (3) from the housing positioning disk (2) to complete the disassembly of the workpiece; Step Seven: Precision mill the first hole (81) and the second hole (82) on the left end face of the workpiece; Step Eight: Precision mill the radial air holes (83); Step Nine: Use a rolling tool to roll three deep-hole structures (84) and machine the circular hole in the right-end inner cavity; ensure that the deep holes meet the requirements of a cylindricity of 0.01 mm and a surface roughness of 0.8; Step Ten: Precision mill the left end face; Step Eleven: Precision turn the left end face of the workpiece; ensure that the deviation between the center of rotation of the left end face of the deep-hole housing (8) and the axis is less than 0.005; Step Twelve: Inspect the dimensions to complete the machining of the deep-hole housing.

2. A machining method for a deep-hole housing according to claim 1, wherein: In Step Twelve, before inspecting the dimensions, the workpiece needs to be electrically engraved with a serial number; after inspecting the dimensions, clean the deep-hole housing and complete the warehousing.

3. A machining method for a deep-hole housing according to claim 2, wherein: The deep-hole housing (8) is a small-sized deep-hole stainless-steel housing, and the three deep-hole structures (84) are the areas where the valve stem reciprocates, and the depth of the deep-hole structure is 80 mm.

4. A machining method for a deep-hole housing according to claim 3, wherein: In Step Five, use a lathe equipment in cooperation with the clamping tooling for the deep-hole housing to rough-machine the deep-hole structure, and ensure the positional tolerance of the three deep-hole structures and the surface quality of the bottom holes.

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