Method for manufacturing precision valve cavity hole with inner expanding diameter structure in intermittent deep hole

Abstract

The application discloses a manufacturing method of a precision valve cavity hole with an intermittent deep hole and an inner expanding diameter structure, and steps of the method comprise: a first stage: rough machining is performed on the valve cavity hole, the intermittent deep hole is expanded, and after the expansion and heat treatment, D1 is reached; precision machining of the hole diameter D1 of the intermittent deep hole is completed; the intermittent deep hole is measured; a moving boring cutter one is used to perform rough machining on the valve cavity hole; a second stage: semi-precision machining is performed on the valve cavity hole after a surfacing treatment, the intermittent deep hole is expanded to D2; precision machining of the hole diameter D2 of the intermittent deep hole is completed; the intermittent deep hole is measured; a moving boring cutter two is used to perform semi-precision machining on the valve cavity hole; a third stage: precision machining is performed on the valve cavity hole, and precision machining of the hole diameter of the intermittent deep hole to D is completed; the intermittent deep hole machined in step 9 is measured; a moving boring cutter three is used to perform precision machining on the valve cavity hole. The method meets the manufacturing requirement of the precision valve cavity hole with the intermittent deep hole and the inner expanding diameter structure.

Description

Technical Field

[0001] This invention belongs to the field of petroleum equipment manufacturing technology, and relates to a method for manufacturing a precision valve cavity with an internally expanded diameter structure in a discontinuous deep hole. Background Technology

[0002] Marine oil equipment is characterized by a high degree of automation, high integration of valve structures, high requirements for corrosion resistance, and high sealing performance for liquid and gaseous media. Therefore, internally expanded diameter precision valve chambers are widely used in marine oil equipment. (Hereinafter referred to as valve chambers.)

[0003] To meet corrosion resistance requirements, a corrosion-resistant, difficult-to-machine material (*nickel-based alloy) is welded inside the structure. This structure presents a significant challenge in manufacturing, combining the difficulties of machining discontinuous deep holes, difficult-to-machine materials, and blind-sight conditions for valve cavity borehole machining. Ensuring the precision of the machined valve cavity borehole requires overcoming not only the impact of the discontinuous deep hole diameter on the tool strength but also the impact of the discontinuous deep hole on the machining precision under blind-sight conditions, making the manufacturing process extremely difficult. Summary of the Invention

[0004] This invention provides a method for manufacturing a precision valve cavity with an internally expanded diameter structure in a discontinuous deep hole. This method solves the problems in the prior art where the diameter of the discontinuous deep hole affects the strength of the machining tool, and the discontinuous deep hole affects the machining accuracy of the valve cavity under blind conditions.

[0005] The technical solution adopted in this invention is a method for manufacturing a precision valve cavity with an internally expanded diameter structure in a discontinuous deep hole, which is implemented according to the following steps:

[0006] Phase 1: Rough machining of the valve cavity bore

[0007] Step 1: Ream the discontinuous deep hole until D1 is achieved after reaming and heat treatment.

[0008] The specific process is as follows: a guide bar boring tool is used to machine a guide hole at the opening of the A end face of the discontinuous deep hole; then a boring bar is used to enlarge the hole, and the machining length is greater than or equal to L3, where L3 satisfies the axial movement stroke of the tool used to machine the valve cavity hole at L1.

[0009] Repeat this step, and before each use of the boring bar, accurately measure the diameter of the guide hole, adjust the machining size of the boring bar accordingly, and simultaneously replace the support guide bar on the tool head and the support block on the support sleeve until the machining allowance meets the diameter of the discontinuous deep hole to D1.

[0010] Step 2: Complete the finishing of the diameter D1 of the discontinuous deep hole to meet the process requirements of the moving boring tool used in Step 4.

[0011] The specific process is as follows: using a guide bar boring tool, the diameter of the guide hole is D1 at the opening of the discontinuous deep hole. The diameter of the guide hole is measured, the machining size of the boring tool is adjusted accordingly, and the support block on the support sleeve is replaced accordingly. The discontinuous deep hole is precision bored so that the diameter of the discontinuous deep hole reaches D1 and the machining length is greater than or equal to L3.

[0012] Step 3: Using a measuring bar with an outer diameter of D1, measure the discontinuous deep hole machined in Step 2.

[0013] The specific process is as follows: Insert the first measuring rod into the discontinuous deep hole, ensuring that it can rotate freely and be pushed and pulled back and forth without any obstruction. If the measurement result meets the requirements, proceed to step 4; otherwise, return to step 2 to continue boring the discontinuous deep hole.

[0014] Step 4: Use a motion boring tool to rough machine the valve cavity hole.

[0015] The motion boring tool is supported by two sets of support guides at the front and rear sections, respectively, in discontinuous deep holes with a diameter of D1 at the front and rear of the valve cavity. For the two valve cavity holes, one valve cavity hole with a distance of L1 from end face A is machined first, and then the other valve cavity hole with a distance of L2 from end face A is machined. The specific process is as follows:

[0016] Precisely measure the corresponding distances L1 and L2 between the center of the two valve cavity holes and the end face A. Then, use the tip of the cutting tool of the first moving boring bar to perform tool setting on the end face A. With the end face A as the reference, the depth of the cutting tool tip entering the discontinuous deep hole is equal to L1 or L2, which is used as the starting point for machining the valve cavity holes.

[0017] Then drive the machine tool spindle, and the moving boring bar drives the moving boring head to rotate, so that the tip of the cutting tool is located at the intersecting hole. Adjust the radial dimension of the cutting tool and move it back and forth axially to complete one diameter expansion machining of the valve cavity hole.

[0018] Repeat this step to complete the rough machining of the valve cavity bore;

[0019] The second stage involves semi-finishing the valve cavity bore after the welding process.

[0020] Step 5: Enlarge the discontinuous deep hole, from D1 to D2.

[0021] The specific process is as follows: use a boring tool to enlarge the discontinuous deep hole, and the machining method is the same as step 1 in the first stage, until the machining allowance of the discontinuous deep hole meets the precision boring diameter to D2;

[0022] Step 6: Complete the finishing of the discontinuous deep hole diameter D2 to meet the process requirements of the moving boring tool II used in Step 8.

[0023] The specific process is as follows: using a guide bar boring tool, the guide hole is precision machined at the opening of the discontinuous deep hole until the diameter of the guide hole is D2. The diameter of the guide hole is measured, and the machining size of the boring tool is adjusted accordingly. The support block on the support sleeve is replaced simultaneously. The discontinuous deep hole is precision bored so that the diameter of the discontinuous deep hole reaches D2 and the machining length is greater than or equal to L3.

[0024] Step 7: Using a second measuring bar with an outer diameter of D2, measure the discontinuous deep hole machined in Step 6.

[0025] The specific process is as follows: Insert the measuring rod into the discontinuous deep hole, ensuring that it can rotate freely and be pushed and pulled back and forth without obstruction. If the measurement result meets the requirements, proceed to step 8; otherwise, return to step 6 to continue boring the discontinuous deep hole.

[0026] Step 8: Use a motion boring tool to perform semi-finishing on the valve cavity holes.

[0027] The second moving boring bar is equipped with a front insert and a rear insert. The distance X between the tips of the front and rear inserts is precisely measured. During machining, two sets of support guides on the front and rear sections of the second moving boring bar are respectively supported in discontinuous deep holes with a diameter of D2 at the front and rear of the valve cavity. The front insert at the front end machines the front half of the valve cavity, and the rear insert machines the rear half of the valve cavity. When machining the valve cavity, one valve cavity is machined first at a distance L1 from end face A, and then the other valve cavity is machined at a distance L2 from end face A. The specific process is as follows:

[0028] Precisely measure the corresponding distances L1 and L2 between the centers of the two valve chamber holes and end face A. Then, use the tip of the front insert to perform tool setting on end face A. With end face A as the reference, the depth to which the tip of the front insert enters the discontinuous deep hole should be equal to L1 or L2. Use this as the starting point for machining the valve chamber holes. At this time, the tip of the front insert is at the center of the valve chamber hole. In order to ensure that the axial travel of the tips of the front and rear inserts is the same during machining, extend the moving boring bar forward into the discontinuous deep hole by half the tip distance X, so that the middle position of the front and rear inserts coincides with the starting point. Alternatively, with the tip of the front insert at the center of the valve chamber hole, machine the front end of the valve chamber hole axially forward, and then machine the rear end of the valve chamber hole axially backward. The axial travel of the rear end should be less than the tip distance X of the axial travel forward.

[0029] Then drive the machine tool spindle, and the moving boring bar drives the moving boring head to rotate, so that the tip of the front insert is located at the intersecting hole. Adjust the radial dimension of the front insert and move it back and forth axially to complete the first diameter expansion machining of the valve cavity hole.

[0030] Repeat this step, and complete the semi-finishing of the valve cavity bore through repeated axial movement and radial dimension adjustment;

[0031] The third stage: precision machining of the valve cavity bore.

[0032] Step 9: Complete the finishing of the discontinuous deep hole to diameter D to meet the process requirements of the motion boring tool three used in step 11.

[0033] The specific process is as follows: using a guide bar boring tool, the diameter of the guide hole is D in the opening of the discontinuous deep hole. The diameter of the guide hole is measured, and the machining size of the boring tool is adjusted accordingly. The support block on the support sleeve is replaced simultaneously. The discontinuous deep hole is precision bored so that the diameter of the discontinuous deep hole reaches D and the machining length is greater than or equal to L3.

[0034] Step 10: Use a third measuring bar with an outer diameter of D to measure the discontinuous deep hole machined in Step 9.

[0035] The specific process is as follows: Insert the measuring rod into the discontinuous deep hole, ensuring that it can rotate freely and be pushed and pulled back and forth without any obstruction. If the measurement result meets the requirements, proceed to step 11; otherwise, return to step 9 to continue boring the discontinuous deep hole.

[0036] Step 11: Use a motion boring bar (type 3) to finish the valve cavity hole.

[0037] The specific process is as follows: Two sets of support guides on the front and rear sections of the moving boring bar are respectively supported in discontinuous deep holes with a diameter of D at the front and rear of the valve cavity hole; the double-tool holder on the moving boring bar is equipped with a front insert and a rear insert. During machining, the front insert is used to machine the front half of the valve cavity hole, and the rear insert is used to machine the rear half of the valve cavity hole. The distance Y between the tips of the front and rear inserts is precisely measured; when machining the valve cavity hole, one valve cavity hole with a distance L1 from end face A is machined first, and then another valve cavity hole with a distance L2 from end face A is machined. The specific process is as follows:

[0038] Precisely measure the corresponding distances L1 and L2 between the center of the two valve cavity holes and the end face A. Then, use the tip of the three front inserts of the moving boring bar to perform tool setting on the end face A. With the end face A as the reference, the depth of the front insert tip entering the discontinuous deep hole should be equal to L1 or L2. Use this as the starting point for machining the valve cavity holes.

[0039] Then drive the machine tool spindle, and the moving boring bar drives the moving boring head to rotate three times, so that the tip of the front insert is located at the intersecting hole. Adjust the radial dimensions of the front insert and the rear insert, and move them back and forth axially to complete one diameter expansion machining of the valve cavity hole.

[0040] Repeat this step, and complete the precision machining of the valve cavity bore through repeated axial movement and radial dimension adjustment.

[0041] The beneficial effects of this invention are that it provides support for the machining tool by using discontinuous deep holes, thereby increasing the strength of the machining tool in discontinuous deep holes. At the same time, it adopts a method of precision boring of discontinuous deep holes and adds a support sleeve to ensure the machining accuracy of discontinuous deep holes. This effectively solves the machining accuracy requirements of discontinuous deep holes, creates conditions for machining valve cavity holes with motion boring tools, and meets the needs of manufacturing precision valve cavity holes with internal expansion structure in discontinuous deep holes. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of two valve chamber holes inside the discontinuous deep hole of the object processed by the method of the present invention;

[0043] Figure 2 This is a top view of the valve cavity hole of the object processed by the method of the present invention;

[0044] Figure 3 This is a schematic diagram of the method of the present invention for processing discontinuous deep holes;

[0045] Figure 4 This is a schematic diagram of the rough machining of the valve cavity hole using the method of the present invention;

[0046] Figure 5 This is a schematic diagram of the valve cavity hole structure after welding before semi-finishing according to the method of the present invention;

[0047] Figure 6 This is a schematic diagram of the semi-finishing of the valve cavity hole using the method of the present invention;

[0048] Figure 7 This is a schematic diagram of the precision machining of the valve cavity hole using the method of the present invention;

[0049] Figure 8 This is a schematic diagram of the measuring rod used in the method of this invention;

[0050] Figure 9 This is a schematic diagram of the guide bar boring tool used in the method of this invention;

[0051] Figure 10 This is a schematic diagram of the front section structure of the motion boring tool used in the method of this invention;

[0052] Figure 11 This is a schematic diagram of the front section structure of the motion boring tool II used in the method of this invention;

[0053] Figure 12 This is a schematic diagram of the front section structure of the motion boring tool III used in the method of this invention;

[0054] Figure 13 This is a schematic diagram of the installation structure of the single-blade clamp used in the method of the present invention;

[0055] Figure 14This is a schematic diagram of the installation structure of the double-blade clamp used in the method of the present invention.

[0056] In the diagram, 1. Discontinuous deep hole; 2. Valve cavity hole; 3. Welding material; 4. Motion boring tool one; 5. Intersecting hole; 6. Support guide bar; 7. Motion boring tool two; 8. Front insert; 9. Rear insert; 10. Motion boring tool three; 11. Tool head; 12. Tool shank; 13. Support sleeve; 14. Support block; 15. Round tube; 16. T-shaped handle; 17. Double tool holder; 18. Boring insert; 19. Pointed insert; 20. Single tool holder; 21. Motion boring tool head one; 22. Motion boring tool head two; 23. Motion boring tool head three; 24. Motion boring tool shank; 25. Support guide bar.

[0057] Additionally, end face A is the tool entry point during machining; B is the valve cavity hole structure during rough machining; C is the valve cavity hole structure during semi-finish machining; D1 is the diameter of the discontinuous deep hole after rough machining; D2 is the diameter of the discontinuous deep hole after semi-finish machining; D is the finished diameter of the discontinuous deep hole; L1 and L2 are the dimensions of the valve cavity hole and its intersecting hole center from end face A, respectively; L3 is the length of the discontinuous deep hole to be machined from end face A. Detailed Implementation

[0058] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0059] Reference Figure 1 and Figure 2 The precision valve cavity hole with an expanded diameter structure, referred to as valve cavity hole 2, is used to process the product by the method of this invention. A valve cavity hole 2 is provided at each intersection of the discontinuous deep hole 1 and each intersecting hole 5. The valve cavity hole 2 can only be processed after the rough machining and heat treatment of the discontinuous deep hole 1 and the intersecting holes 5. The processing of the valve cavity hole 2 is divided into three stages, all completed on a CNC boring machine. The first stage is the rough machining of the valve cavity hole 2; the second stage is the semi-finishing of the valve cavity hole 2 after welding a corrosion-resistant welding material 3 (this invention omits the description of the welding process and only describes the semi-finishing of the valve cavity hole 2); the third stage is the finishing of the valve cavity hole 2 to obtain the final product.

[0060] The method of the present invention also uses a measuring bar, a guide bar boring tool, a moving boring tool 4, a moving boring tool 7, and a moving boring tool 3 10 in the three processing stages, which will be described below.

[0061] Reference Figure 8In this invention, a measuring rod is used for bore diameter measurement during the processing. The measuring rod consists of an integrally connected circular tube 15 and a T-shaped handle 16. The outer circumference of the front section of the circular tube 15 is precision ground, and both ends of the circular tube 15 are welded with end plates. The longitudinal section of the rear section of the T-shaped handle 16 is coaxially welded to the end plate at the rear end, and the transverse section of the T-shaped handle 16 is used for gripping during operation. Both the circular tube 15 and the T-shaped handle 16 are made of steel pipe. The length of the circular tube 15 should be greater than the distance between the front and rear support positions on the moving boring bar. The total length of the measuring rod is greater than L3, where L3 is the process dimension. In the three stages, the length of the measuring rod should meet the axial travel of the tool when machining the valve cavity hole 2 at L1 using the moving boring bar in each stage. The dimensions of the measuring rod used in each stage are the same as the diameter of the outer contour of the support guide used in that stage, i.e., D1, D2, and D.

[0062] Reference Figure 9 The structure of the guide bar boring tool includes a front section of the cutting head 11 and a rear section of the tool holder 12. Both the cutting head 11 and the tool holder 12 are standard parts provided by the tool supplier. A support guide bar 6 is installed on the outer circumference of the cutting head 11. A boring insert 18 is installed on the outer edge of the front end of the cutting head 11. The boring insert 18 is only used to enlarge the intermittent deep hole 1 and cannot machine the radial part of the valve cavity hole 2. A support sleeve 13 is fitted on the tool holder 12 at intervals from the cutting head 11. The support sleeve 13 is fitted on the tool holder 12 by a clamping screw in a clamping screw hole. Support blocks 14 are installed in multiple sets of square holes arranged along the circumference of the support sleeve 13. The outer dimensions of the support blocks 14 on the support sleeve 13 are determined according to the inner diameter of the intermittent deep hole 1 at different stages.

[0063] The assembly method of the guide bar boring tool is as follows: First, a support block 14 is fixedly installed in each square hole on the outer circumference of the support sleeve 13 with countersunk screws, so that all the support blocks 14 are fixed to the support sleeve 13 as a whole; then, the support sleeve 13 is put on the tool bar 12 and the clamping screw is screwed into the clamping screw hole, so that the support sleeve 13 and the tool bar 12 are fixed to the whole; finally, the tool bar 12 with the support sleeve 13 and the support blocks 14 installed is securely connected to the tool head 11 end to end.

[0064] Reference Figure 10 , Figure 13 The structure of the moving boring tool 4 includes a moving boring tool head 21 (within the dashed box). A set of support guides 25 are provided on the front and back of the outer circumference of the moving boring tool head 21 (multiple support guides 25 are evenly distributed on a circle, which is called a set). A single tool holder 20 is installed on the outer circumference of the moving boring tool head 21 between the two sets of support guides 25. A pointed blade 19 is installed on the outer edge of the single tool holder 20. The moving boring tool head 21 is coaxially fixedly connected to the moving boring tool rod 24 by bolts.

[0065] Reference Figure 11 , Figure 14The structure of the second moving boring tool 7 is as follows: it includes a second moving boring tool head 22 (within the dashed box). A set of support guide bars 25 are provided at the front and rear of the outer circumference of the second moving boring tool head 22. A double tool holder 17 is installed on the outer circumference of the second moving boring tool head 22 between the two sets of support guide bars 25. A front blade 8 and a rear blade 9 are respectively installed at the front and rear end sharp corners of the double tool holder 17. The second moving boring tool head 22 is coaxially fixedly connected to the second moving boring tool rod 24 by bolts.

[0066] Reference Figure 12 , Figure 14 The main structure of the three moving boring tools 10 is similar to that of the two moving boring tools 7. The structure of the three moving boring tools 10 includes a three moving boring tool head 23 (within the dashed box). A set of support guides 25 is provided at the front and rear of the outer circumference of the three moving boring tool head 23. A double tool holder 17 is also installed on the outer circumference of the three moving boring tool head 23 between the two sets of support guides 25. A front blade 8 and a rear blade 9 are respectively installed at the front and rear end sharp corners of the double tool holder 17 (the double tool holder 17 used in the two moving boring tools 7 and the three moving boring tools 10 has the same structure). The three moving boring tool head 23 is coaxially fixedly connected to the moving boring tool rod 24 by bolts.

[0067] Both the single-tool clip 20 and the double-tool clip 17 mentioned above can be radially adjusted, that is, they are connected to the adjustment mechanism inside the moving boring head and the moving boring bar by screws.

[0068] The differences between guide bar boring tools, motion boring tools 1-4, motion boring tools 2-7, and motion boring tools 3-10 are:

[0069] 1) The guide bar boring tool is used for machining the diameter of the discontinuous deep hole 1, the moving boring tool 4 is used for roughing the valve cavity hole 2 in the first stage, the moving boring tool 7 is used for semi-finishing the valve cavity hole 2 in the second stage, and the moving boring tool 10 is used for finishing the valve cavity hole 2 in the third stage.

[0070] 2) The difference between the three motion boring tools 1 (4), 2 (7), and 3 (10) is that the size range of the outer contour of the motion boring tool head increases sequentially, namely D1, D2, and D.

[0071] 3) The motion boring bar 24 in motion boring tool 1 4, motion boring tool 2 7, and motion boring tool 3 10 is the same component, which provides torque to the corresponding motion boring head in three different stages.

[0072] 4) The structures of the three-motion boring tools and the guide bar boring tools differ in the tool head and tool shank sections. The longitudinal length of the support guide bar 6 of the guide bar boring tool is short, while the longitudinal length of the support guide bar 25 of the motion boring tool is long. When machining the valve cavity hole 2, the motion boring tool shank only transmits the machine tool torque, and the support guide bars set at the front and rear sections of the motion boring tool head are sufficient to ensure support during the machining of the valve cavity hole 2. The tool shank 12 of the guide bar boring tool is a standard part with a fixed length, and the length of the tool shank can be increased or decreased according to the different depths of the hole. However, the motion boring tool shank of the three-motion boring tools is a non-standard part customized according to the hole depth. In application, only the motion boring tool head needs to be replaced.

[0073] The method of the present invention, utilizing the aforementioned guide bar boring tool, moving boring tool, and measuring bar, is implemented according to the following steps:

[0074] Phase 1: Rough machining of valve cavity hole 2.

[0075] Step 1, refer to Figure 3 The discontinuous deep hole 1 is enlarged, and after enlargement and heat treatment, it reaches D1.

[0076] The specific process is as follows: (Refer to...) Figure 9 Using an adjustable guide bar boring tool (this guide bar boring tool is used for roughing, and the guide bar boring tool used in the second stage is used for finishing, but they are actually the same type of guide bar boring tool), a guide hole is machined at the opening of the A end face of the discontinuous deep hole 1; then the hole is enlarged using boring bar 18, with a machining length greater than or equal to L3, where L3 satisfies the axial movement stroke of the tool used to machine the valve cavity hole 2 at L1;

[0077] Repeat this step, and before each machining operation using the boring bar 18, accurately measure the diameter of the guide hole, adjust the machining size of the boring bar 18 accordingly, and simultaneously replace the support guide bar 6 on the cutter head 11 and the support block 14 on the support sleeve 13 to meet the support requirements for machining the current hole diameter, until the machining allowance meets the diameter of the discontinuous deep hole 1 up to D1.

[0078] Step 2, refer to Figure 3 Complete the finishing of the discontinuous deep hole 1 with a diameter D1 to meet the process requirements of the moving boring tool 4 used in step 4.

[0079] The specific process is as follows: Using a guide bar boring tool with adjustable machining dimensions (all guide bar boring tools are the same tool), the diameter of the guide hole is D1 at the opening of the discontinuous deep hole 1. The diameter of the guide hole is measured, and the machining dimensions of the boring bar 18 are adjusted accordingly. (The boring bar 18 in step 1 is mainly used to remove the machining allowance. At this time, the boring bar 18 is used for the final finishing on the basis of the machining in step 1, so that the accuracy and form and position tolerance of the diameter of the discontinuous deep hole 1 meet the usage requirements of the support guide bar 25 of the moving boring bar 4.) The support block 14 on the support sleeve 13 is replaced accordingly, and the discontinuous deep hole 1 is precision bored so that the diameter of the discontinuous deep hole 1 reaches D1 and the machining length is greater than or equal to L3.

[0080] Step 3: Using a first measuring bar with an outer diameter of D1 (i.e., the diameter tolerance range is the same as D1 at the outer contour of the support guide bar 25 of the moving boring bar 4), measure the discontinuous deep hole 1 machined in Step 2.

[0081] The specific process is as follows: Insert the first measuring rod into the discontinuous deep hole 1, so that it can rotate freely and be pushed and pulled back and forth without any obstruction. If the measurement result meets the requirements, proceed to step 4; otherwise, return to step 2 to continue boring the discontinuous deep hole 1.

[0082] Step 4: Use a motion boring bar 4 to rough machine the valve cavity hole 2.

[0083] The moving boring bar 4 is supported by two sets of support guides 25 at the front and rear ends, respectively, in the discontinuous deep holes 1 with a diameter of D1 at the front and rear ends of the valve cavity hole 2. For the two valve cavity holes 2, one valve cavity hole 2 with a distance of L1 from end face A is machined first, and then the other valve cavity hole 2 with a distance of L2 from end face A is machined. The specific process is as follows:

[0084] Precisely measure the corresponding distances L1 and L2 between the center of the two valve cavity holes 2 and the end face A. Then, use the tip of the cutting tool 19 of the moving boring tool 4 to perform tool setting on the end face A. With the end face A as the reference, the cutting tool tip of the cutting tool 19 enters the discontinuous deep hole 1 to a depth equal to L1 or L2, which is used as the starting point for machining the valve cavity hole 2.

[0085] Then drive the machine tool spindle, and the moving boring bar 24 drives the moving boring head 21 to rotate, so that the tip of the pointed insert 19 is located at the intersecting hole 5. Adjust the radial dimension of the pointed insert 19 and move it back and forth axially to complete the first diameter expansion machining of the valve cavity hole 2.

[0086] Repeat this step to complete the rough machining of valve cavity hole 2. At this point, the structure of valve cavity hole 2 is as follows: Figure 4 Position B in the diagram is shown.

[0087] Special Note: After the first stage is completed, a welding process is required for the welding material 3 inside the valve cavity hole 2 (this welding process is omitted in the steps of this invention). That is, after welding, the area where the welding material 3 is located in the valve cavity hole 2 needs to be processed, see... Figure 5 Then proceed to the second stage, starting with the two C positions.

[0088] Second stage: Semi-finishing of valve cavity hole 2 after welding treatment.

[0089] Step 5, refer to Figure 6 For the discontinuous deep hole 1, the hole diameter is enlarged from D1 to D2.

[0090] The specific process is as follows: the intermittent deep hole 1 is enlarged using boring tool 18, and the machining method is the same as step 1 in the first stage, until the machining allowance of the intermittent deep hole 1 meets the precision boring diameter D2.

[0091] Step 6, refer to Figure 5 Complete the finishing of the discontinuous deep hole 1 with a diameter D2 to meet the process requirements of the moving boring tool 7 used in step 8.

[0092] The specific process is as follows: Using a guide bar boring tool with adjustable machining dimensions (all guide bar boring tools are the same tool), the guide hole is precision machined at the opening of the discontinuous deep hole 1 until the diameter of the guide hole is D2. The diameter of the guide hole is measured, and the machining dimensions of the boring bar 18 are adjusted accordingly. (The boring bar 18 in step 5 is mainly to remove the machining allowance. At this time, the boring bar 18 is performing the final finishing on the basis of the previous machining, so that the accuracy and form and position tolerance of the diameter of the discontinuous deep hole 1 meet the usage requirements of the support guide bar 25 of the moving boring bar 2 7.) The support block 14 on the support sleeve 13 is replaced simultaneously, and the discontinuous deep hole 1 is precision bored so that the diameter of the discontinuous deep hole 1 reaches D2 and the machining length is greater than or equal to L3.

[0093] Step 7: Using a second measuring bar with an outer diameter of D2 (i.e., the diameter tolerance range is the same as D2 at the mounting support guide bar 25 of the moving boring bar 7), measure the discontinuous deep hole 1 machined in step 6.

[0094] The specific process is as follows: Insert the measuring rod into the discontinuous deep hole 1, so that it can rotate freely and be pushed and pulled back and forth without any obstruction. If the measurement result meets the requirements, proceed to step 8; otherwise, return to step 6 to continue boring the discontinuous deep hole 1.

[0095] Step 8, refer to Figure 6 The valve cavity hole 2 is semi-finished using a motion boring tool 2.

[0096] The second moving boring bar 7 is equipped with a front insert 8 and a rear insert 9. The distance X between the tips of the front insert 8 and the rear insert 9 is precisely measured. During machining, the two sets of support guides 25 on the front and rear sections of the second moving boring bar 7 are respectively supported in the discontinuous deep holes 1 with a diameter of D2 at the front and rear of the valve cavity hole 2. The front insert 8 at the front end machines the front half of the valve cavity hole 2, and the rear insert 9 machines the rear half of the valve cavity hole 2. When machining the valve cavity hole 2, one valve cavity hole 2 at a distance L1 from end face A is machined first, and then the other valve cavity hole 2 at a distance L2 from end face A is machined.

[0097] The specific process is as follows: accurately measure the corresponding distances L1 and L2 between the center of the two valve cavity holes 2 and the end face A. Then, use the tip of the front insert 8 to perform tool setting on the end face A. With the end face A as the reference, the depth to which the tip of the front insert 8 enters the discontinuous deep hole 1 should be equal to L1 or L2. This is used as the starting point for machining the valve cavity hole 2. At this time, the tip of the front insert 8 is at the center position of the valve cavity hole 2. In order to ensure that the axial travel of the tips of the front insert 8 and the rear insert 9 is the same during machining, extend the moving boring bar 24 forward into the discontinuous deep hole 1 by half the tip distance X, so that the middle position of the front insert 8 and the rear insert 9 coincides with the starting point. Alternatively, with the tip of the front insert 8 at the center position of the valve cavity hole 2, machine the front end of the valve cavity hole 2 axially forward, and then machine the rear end of the valve cavity hole 2 axially backward. The axial travel of the rear end should be less than the tip distance X of the axial travel forward.

[0098] Then drive the machine tool spindle, and the moving boring bar 24 drives the moving boring head 22 to rotate, so that the tip of the front insert 8 (the front insert 8 is more convenient to operate each time the tool is set, and the front insert 8 is the reference here) is located at the intersecting hole 5. Adjust the radial dimension of the front insert 8 and move it back and forth axially to complete one diameter expansion machining of the valve cavity hole 2.

[0099] Repeat this step, through repeated axial movement and radial dimension adjustment, to complete the semi-finishing of valve cavity hole 2. The structure of the finished valve cavity hole 2 is as follows. Figure 5 As shown in section C.

[0100] Third stage: Finish machining of valve cavity hole 2.

[0101] Since the machining allowance left for the third stage in the semi-finishing stage is only sufficient to meet the finishing requirements, the machining method for the discontinuous deep hole 1 in step 9 of the third stage is the same as the machining method for the discontinuous deep hole 1 in step 6 of the second stage. (In addition, since other processes are required in the second and third stages, they are omitted here, so only a finishing allowance is reserved. Otherwise, the method of the present invention could complete the finishing process by the end of the second stage.)

[0102] Step 9, refer to Figure 1Complete the finishing of the discontinuous deep hole 1 to diameter D to meet the process requirements of the motion boring tool 310 used in step 11.

[0103] The specific process is as follows: Using a guide bar boring tool with adjustable machining dimensions (all guide bar boring tools are the same tool), the diameter of the guide hole is precision machined to D at the opening of the discontinuous deep hole 1. The diameter of the guide hole is measured, and the machining dimensions of the boring bar 18 are adjusted accordingly. The support block 14 on the support sleeve 13 is replaced simultaneously. The discontinuous deep hole 1 is precision bored so that the diameter of the discontinuous deep hole 1 reaches D and the machining length is greater than or equal to L3.

[0104] Step 10: Using a third measuring bar with an outer diameter of D (i.e., the diameter tolerance range is the same as D at the mounting support guide of the moving boring bar 310), measure the discontinuous deep hole 1 machined in step 9.

[0105] The specific process is as follows: Insert the measuring rod into the discontinuous deep hole 1, so that it can rotate freely and be pushed and pulled back and forth without any obstruction. If the measurement result meets the requirements, proceed to step 11; otherwise, return to step 9 to continue boring the discontinuous deep hole 1.

[0106] Step 11, refer to Figure 7 The valve cavity hole 2 is precision machined using a motion boring tool 310, according to... Figure 2 The dimensions shown are to be machined to the required size.

[0107] The specific process is as follows: (Refer to...) Figure 6 The valve cavity hole 2 is precision machined using a three-piece moving boring bar 10. Two sets of support guides 25 on the front and rear sections of the three-piece moving boring bar 10 are respectively supported in discontinuous deep holes 1 with a diameter of D at the front and rear of the valve cavity hole 2. A double-tool holder 17 on the three-piece moving boring bar 10 is equipped with a front insert 8 and a rear insert 9. During machining, the front insert 8 is used to machine the front half of the valve cavity hole 2, and the rear insert 9 is used to machine the rear half of the valve cavity hole 2. The distance Y between the tips of the front insert 8 and the rear insert 9 is precisely measured. When machining the valve cavity hole 2, one valve cavity hole 2 at a distance L1 from end face A is machined first, and then another valve cavity hole 2 at a distance L2 from end face A is machined. The specific process is as follows:

[0108] Precisely measure the corresponding distances L1 and L2 between the center of the two valve cavity holes 2 and the end face A. Then, use the tip of the front insert 8 of the moving boring bar 310 to perform tool setting on the end face A. With the end face A as the reference, the depth to which the tip of the front insert 8 enters the discontinuous deep hole 1 should be equal to L1 or L2. Use this as the starting point for machining the valve cavity holes 2.

[0109] Then drive the machine tool spindle, and the moving boring bar 24 drives the moving boring head 23 to rotate, so that the tip of the front insert 8 is located at the intersecting hole. Adjust the radial dimensions of the front insert 8 and the rear insert 9, and move them back and forth axially to complete one expansion machining of the valve cavity hole 2.

[0110] Repeat this step, through repeated axial movement and radial dimension adjustment, to complete the finishing of valve cavity hole 2. The structure of the finished valve cavity hole 2 is as follows: Figure 2 As shown.

Claims

1. A method for manufacturing a precision valve cavity with an internally expanded diameter structure in a discontinuous deep hole, characterized in that, Follow these steps: Phase 1: Rough machining of the valve cavity bore Step 1: Ream the discontinuous deep hole until D1 is achieved after reaming and heat treatment. The specific process is as follows: a guide bar boring tool is used to machine a guide hole at the opening of the A end face of the discontinuous deep hole; then the boring tool (18) is used to enlarge the hole, and the machining length is greater than or equal to L3, and L3 satisfies the axial movement stroke of the tool for machining the valve cavity hole at L1. Repeat this step, and before each use of the boring bar (18) for machining, accurately measure the diameter of the guide hole, adjust the machining size of the boring bar (18) accordingly, and simultaneously replace the support guide bar (6) on the tool head (11) and the support block (14) on the support sleeve (13) until the machining allowance meets the diameter of the discontinuous deep hole to D1; Step 2: Complete the finishing of the diameter D1 of the discontinuous deep hole to meet the process requirements of the moving boring tool (4) used in Step 4. The specific process is as follows: using a guide bar boring tool, the diameter of the guide hole is D1 at the opening of the discontinuous deep hole. The diameter of the guide hole is measured, and the machining size of the boring tool (18) is adjusted accordingly. The support block (14) on the support sleeve (13) is replaced accordingly. The discontinuous deep hole is precision bored so that the diameter of the discontinuous deep hole reaches D1 and the machining length is greater than or equal to L3. Step 3: Using a measuring bar with an outer diameter of D1, measure the discontinuous deep hole machined in Step 2. The specific process is as follows: Insert the first measuring rod into the discontinuous deep hole, ensuring that it can rotate freely and be pushed and pulled back and forth without any obstruction. If the measurement result meets the requirements, proceed to step 4; otherwise, return to step 2 to continue boring the discontinuous deep hole. Step 4: Use a motion boring tool (4) to rough machine the valve cavity hole. The moving boring bar (4) is supported by two sets of support guides (25) on the front and rear sections respectively in the discontinuous deep holes with a diameter of D1 in front and behind the valve cavity. For the two valve cavity holes, the valve cavity hole with a distance of L1 from the end face A is machined first, and then the other valve cavity hole with a distance of L2 from the end face A is machined. The specific process is as follows: Precisely measure the corresponding distances L1 and L2 between the center of the two valve cavity holes and the A end face. Then, use the tip of the cutting tool (19) of the moving boring tool (4) to perform tool setting on the A end face. With the A end face as the reference, the cutting tool tip of the cutting tool (19) enters the discontinuous deep hole to a depth equal to L1 or L2, and uses this as the starting point for machining the valve cavity hole. Then drive the machine tool spindle, and the moving boring bar (24) drives the moving boring head (21) to rotate, so that the tip of the pointed insert (19) is located at the intersecting hole. Adjust the radial dimension of the pointed insert (19) and move it back and forth in the axial direction to complete the first diameter expansion machining of the valve cavity hole. Repeat this step to complete the rough machining of the valve cavity bore; The second stage involves semi-finishing the valve cavity bore after the welding process. Step 5: Enlarge the discontinuous deep hole, from D1 to D2. The specific process is as follows: use boring bar (18) to enlarge the discontinuous deep hole. The machining method is the same as step 1 in the first stage until the machining allowance of the discontinuous deep hole meets the precision boring diameter to D2. Step 6: Complete the finishing of the discontinuous deep hole diameter D2 to meet the process requirements of the moving boring tool 2 (7) used in step 8. The specific process is as follows: using a guide bar boring tool, the guide hole is precision machined at the opening of the discontinuous deep hole until the diameter of the guide hole is D2. The diameter of the guide hole is measured, and the machining size of the boring tool (18) is adjusted accordingly. The support block (14) on the support sleeve (13) is replaced simultaneously. The discontinuous deep hole is precision bored so that the diameter of the discontinuous deep hole reaches D2 and the machining length is greater than or equal to L3. Step 7: Using a second measuring bar with an outer diameter of D2, measure the discontinuous deep hole machined in Step 6. The specific process is as follows: Insert the measuring rod into the discontinuous deep hole, ensuring that it can rotate freely and be pushed and pulled back and forth without obstruction. If the measurement result meets the requirements, proceed to step 8; otherwise, return to step 6 to continue boring the discontinuous deep hole. Step 8: Use a motion boring tool (7) to perform semi-finishing on the valve cavity hole. The second moving boring bar (7) is equipped with a front insert (8) and a rear insert (9). The distance X between the tips of the front insert (8) and the rear insert (9) is accurately measured. During machining, the two sets of support guides (25) on the front and rear sections of the second moving boring bar (7) are respectively supported in the discontinuous deep holes with a diameter of D2 at the front and rear of the valve cavity hole. The front insert (8) at the front end machines the front half of the valve cavity hole, and the rear insert (9) machines the rear half of the valve cavity hole. When machining the valve cavity hole, one valve cavity hole with a distance of L1 from the end face A is machined first, and then another valve cavity hole with a distance of L2 from the end face A is machined. The specific process is as follows: Accurately measure the corresponding distances L1 and L2 between the center of the two valve chamber holes and the end face A. Then, use the tip of the front insert (8) to perform tool setting on the end face A. With the end face A as the reference, the depth of the tip of the front insert (8) entering the discontinuous deep hole should be equal to L1 or L2. Use this as the starting point for machining the valve chamber hole. At this time, the tip of the front insert (8) is at the center of the valve chamber hole. In order to make the axial stroke of the tips of the front insert (8) and the rear insert (9) the same during machining, extend the moving boring bar (24) forward into the discontinuous deep hole by half the tip distance X, so that the middle position of the front insert (8) and the rear insert (9) coincides with the starting point. Alternatively, with the tip of the front insert (8) at the center of the valve chamber hole, machine the front end of the valve chamber hole axially forward, and then machine the rear end of the valve chamber hole axially backward. The axial stroke of the rear end should be less than the tip distance X of the axial stroke forward. Then drive the machine tool spindle, move the boring bar (24) to drive the second boring head (22) to rotate, so that the tip of the front insert (8) is located at the intersecting hole. Adjust the radial dimension of the front insert (8) and move it back and forth in the axial direction to complete the first diameter expansion machining of the valve cavity hole. Repeat this step, and complete the semi-finishing of the valve cavity bore through repeated axial movement and radial dimension adjustment; The third stage: precision machining of the valve cavity bore. Step 9: Complete the finishing of the discontinuous deep hole to diameter D, to meet the process requirements of the moving boring tool three (10) used in step 11. The specific process is as follows: using a guide bar boring tool, the diameter of the guide hole is D in the opening of the discontinuous deep hole. The diameter of the guide hole is measured, and the machining size of the boring tool (18) is adjusted accordingly. The support block (14) on the support sleeve (13) is replaced simultaneously. The discontinuous deep hole is precision bored so that the diameter of the discontinuous deep hole reaches D and the machining length is greater than or equal to L3. Step 10: Use a third measuring bar with an outer diameter of D to measure the discontinuous deep hole machined in Step 9. The specific process is as follows: Insert the measuring rod into the discontinuous deep hole, ensuring that it can rotate freely and be pushed and pulled back and forth without any obstruction. If the measurement result meets the requirements, proceed to step 11; otherwise, return to step 9 to continue boring the discontinuous deep hole. Step 11: Use a motion boring tool (10) to finish the valve cavity hole. The specific process is as follows: The two sets of support guides (25) of the front and rear sections of the moving boring bar three (10) are respectively supported in the discontinuous deep holes with a diameter of D in front and behind the valve cavity hole; the double tool holder (17) on the moving boring bar three (10) is equipped with a front cutting tool (8) and a rear cutting tool (9). During machining, the front cutting tool (8) is used to machine the front half of the valve cavity hole, and the rear cutting tool (9) is used to machine the rear half of the valve cavity hole. The distance Y between the cutting tips of the front cutting tool (8) and the rear cutting tool (9) is accurately measured; when machining the valve cavity hole, one valve cavity hole with a distance of L1 from the end face A is machined first, and then another valve cavity hole with a distance of L2 from the end face A is machined. The specific process is as follows: Precisely measure the corresponding distances L1 and L2 between the center of the two valve cavity holes and the A end face. Then, use the tip of the front insert (8) of the three moving boring tools (10) to perform tool setting on the A end face. With the A end face as the reference, the depth of the tip of the front insert (8) entering the discontinuous deep hole should be equal to L1 or L2. Use this as the starting point for machining the valve cavity holes. Then drive the machine tool spindle, and the moving boring bar (24) drives the moving boring head three (23) to rotate, so that the tip of the front insert (8) is located at the intersecting hole. Adjust the radial dimension of the front insert (8) and the rear insert (9), and move back and forth axially to complete the first diameter expansion machining of the valve cavity hole. Repeat this step, and complete the precision machining of the valve cavity bore through repeated axial movement and radial dimension adjustment.

2. The method for manufacturing a precision valve cavity with an internally expanded diameter structure in a discontinuous deep hole according to claim 1, characterized in that, The measuring rod has the following structure: it includes an integrally connected round tube (15) and a T-shaped handle (16). The outer circumference of the front round tube (15) is precision ground, and both ends of the round tube (15) are welded with end plates. The longitudinal long section of the rear T-shaped handle (16) is coaxially welded to the end plate at the rear end, and the transverse short section of the T-shaped handle (16) is used for hand gripping during operation.

3. The method for manufacturing a precision valve cavity with an internally expanded diameter structure in a discontinuous deep hole according to claim 1, characterized in that, The structure of the guide bar boring tool includes a front section of the cutting head (11) and a rear section of the cutting bar (12). A support guide bar (6) is installed on the outer circumference of the cutting head (11), and a boring bar (18) is installed at the outer edge of the front end of the cutting head (11). A support sleeve (13) is fitted on the cutting bar (12) at intervals from the cutting head (11), and support blocks (14) are installed in multiple sets of square holes arranged along the circumference of the support sleeve (13).

4. The method for manufacturing a precision valve cavity with an internally expanded diameter structure in a discontinuous deep hole according to claim 1, characterized in that, The structure of the moving boring tool (4) is as follows: it includes a moving boring head (21), and a set of support guides (25) are provided on the front and back of the outer circumference of the moving boring head (21). A single blade clamp (20) is installed on the outer circumference of the moving boring head (21) between the two sets of support guides (25). A pointed blade (19) is installed on the outer end of the single blade clamp (20). The moving boring head (21) is coaxially fixedly connected to the moving boring bar (24) by bolts.

5. The method for manufacturing a precision valve cavity with an internally expanded diameter structure in a discontinuous deep hole according to claim 4, characterized in that, The single-blade clamp (20) is radially adjustable, that is, it is connected to the adjustment mechanism inside the moving boring head and the moving boring bar by screws.

6. The method for manufacturing a precision valve cavity with an internally expanded diameter structure in a discontinuous deep hole according to claim 1, characterized in that, The structure of the second moving boring tool (7) is as follows: it includes a second moving boring tool head (22), and a set of support guide bars (25) are provided at the front and rear of the outer circumference of the second moving boring tool head (22). A double tool holder (17) is installed on the outer circumference of the second moving boring tool head (22) between the two sets of support guide bars (25). A front cutting blade (8) and a rear cutting blade (9) are respectively installed at the front and rear end sharp corners of the double tool holder (17). The second moving boring tool head (22) is coaxially fixedly connected to the moving boring tool rod (24) by bolts.

7. The method for manufacturing a precision valve cavity with an internally expanded diameter structure in a discontinuous deep hole according to claim 1, characterized in that, The structure of the moving boring tool three (10) is as follows: it includes a moving boring tool head three (23), and a set of support guide bars (25) are provided on the front and back of the outer circumference of the moving boring tool head three (23). A double tool clamp (17) is also installed on the outer circumference of the moving boring tool head three (23) between the two sets of support guide bars (25). The front and rear end sharp corners of the double tool clamp (17) are respectively equipped with a front blade (8) and a rear blade (9). The moving boring tool head three (23) is coaxially fixedly connected to the moving boring tool rod (24) by bolts.

8. The method for manufacturing a precision valve cavity with an internally expanded diameter structure in a discontinuous deep hole according to claim 6 or 7, characterized in that, The double-blade clamp (17) is radially adjustable, that is, it is connected to the adjustment mechanism inside the moving boring head and the moving boring bar by screws.

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