A method for processing a connecting hole wall of an inner valve seat of a Type IV bottle liner

Abstract

The application discloses a processing method for a hole wall of a connecting hole of an inner valve seat of a four-type bottle liner, and adopts a vertical boring machine with a servo rotary table. A clamping tool is arranged on the vertical boring machine and is used for clamping the vertically placed liner on the servo rotary table. The processing method comprises the following steps: S1, clamping; S2, automatic center detection; S3, processing the hole wall of the connecting hole of the inner valve seat of the liner; and S4, loosening the clamping, rotating the liner by 180 degrees, and repeating the steps S1 to S3 to complete the processing of the hole wall of the connecting hole of the inner valve seat of the other end of the liner. The above method and the clamping tool can ensure that the center line of the connecting hole of the inner valve seat after clamping and processing is located on the same straight line with the center line of the inner valve seat and the center line of the outer valve seat, and the coaxiality requirement of the connecting hole of the inner valve seat and the outer valve seat is ensured.

Description

Technical Field

[0001] This invention relates to the field of processing technology for Type IV bottles, and more particularly to a method for processing the wall of the through hole connecting the inner valve seat on the inner liner of a Type IV bottle. Background Technology

[0002] Type IV cylinders refer to fully wound gas cylinders where the inner liner (1) is made of plastic. Due to limitations such as the inherent strength of plastic, the inner liner (1) has relatively low strength and rigidity. Therefore, the valve seat connected to the cylinder opening of the inner liner needs to be made of metal, typically stainless steel or aluminum alloy. Figure 1 and Figure 2 As shown.

[0003] The metal valve seat consists of an outer valve seat 11 and an inner valve seat 12, such as Figure 2 and Figure 3 As shown, the outer valve seat 11 is directly bonded to the inner liner 1 during the molding process. After the inner liner 1 is molded, the wall of the inner valve seat connecting through hole 13 on the inner liner 1 needs to be processed to ensure that the inner valve seat 12 can be smoothly screwed onto the outer valve seat 11, and that the sealing ring 14 on the inner valve seat 12 can be sealed against the wall of the inner valve seat connecting through hole 13.

[0004] To ensure that the inner valve seat 12 can be smoothly screwed onto the outer valve seat 11 and that the sealing ring 14 on the inner valve seat 12 can be sealed against the wall of the inner valve seat connecting through hole 13, it is necessary to ensure that the center line of the inner valve seat 12, the center line of the outer valve seat 11, and the center line of the inner valve seat connecting through hole 13 are all on the same straight line. Therefore, during the machining of the wall of the inner valve seat connecting through hole 13 on the inner liner 1, it is necessary to ensure that the coaxiality requirement between the inner valve seat connecting through hole 13 and the outer valve seat 11 meets the standard.

[0005] Currently, horizontal CNC boring machines are commonly used to machine the inner valve seat connection through hole 13 on the inner liner 1. A three-jaw self-centering chuck and tailstock are used for clamping. However, this method cannot accurately guarantee the coaxiality of the inner valve seat connection through hole 13 and the outer valve seat 11, resulting in a large coaxiality deviation. During the process of screwing the inner valve seat 12 into the outer valve seat 11, the following situations are prone to occur:

[0006] In the first case, the sealing ring 14 on the inner valve seat 12 is prone to collide with the top edge of the inner valve seat connecting through hole 13, causing the lower part of the inner valve seat 12 to be unable to smoothly extend into the inner valve seat connecting through hole 13. When using brute force to unscrew it downwards, it is also easy to damage the sealing ring 14 on the inner valve seat 12.

[0007] The second situation is that the inner valve seat 12 rubs against the wall of the inner valve seat connecting through hole 13, making it impossible to continue screwing downwards and causing a jam.

[0008] The third scenario is that even if the lower section of the inner valve seat 12 can extend into the inner valve seat connecting through hole 13, the large coaxiality deviation causes the sealing ring 14 on the inner valve seat 12 to be unable to completely seal against the wall of the inner valve seat connecting through hole 13, resulting in poor sealing performance. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a method for machining the wall of the inner valve seat connection through hole on the inner liner of a type IV bottle that can ensure the coaxiality requirement between the inner valve seat connection through hole and the outer valve seat.

[0010] The technical solution of the present invention is as follows: A method for machining the inner valve seat connection through hole wall of a type 4 bottle inner liner, using a vertical boring machine with a servo rotary table, wherein a clamping fixture is provided on the vertical boring machine to clamp the vertically placed inner liner on the servo rotary table. The structure of the clamping fixture is as follows: a horizontal positioning reference block is fixedly provided on the servo rotary table of the vertical boring machine, the top surface of the horizontal positioning reference block is the positioning reference surface, a first through hole is opened downward in the middle of the top surface of the horizontal positioning reference block, and a second through hole is opened on the servo rotary table at the position opposite to the first through hole.

[0011] The left mounting base is mounted on the servo rotary table to the left of the horizontal positioning reference block via a pair of left linear guides, and a left gripper is fixedly installed at the right end of the left mounting base; the right mounting base is mounted on the servo rotary table to the right of the horizontal positioning reference block via a pair of right linear guides, with the left and right linear guides parallel to each other, and a right gripper is fixedly installed at the left end of the right mounting base; a first drive device is also provided on the servo rotary table to drive the left and right mounting bases to synchronously close inward or synchronously open outward.

[0012] The tailstock is mounted on the column of the vertical boring machine via the first linear guide rail, and is driven by the second drive device. Under the drive of the second drive device, the tailstock rises or falls vertically via the pair of first linear guide rails; the horizontal module is mounted on the bottom of the tailstock via an elastic structure.

[0013] The tool mounting base is mounted on a vertical boring machine below the second through hole via a pair of second linear guides. The tool mounting base is driven by a third drive device. Under the drive of the third drive device, the tool mounting base rises vertically via the pair of second linear guides, passes through the second through hole and the first through hole, and continues to move up and down, or descends vertically.

[0014] A method for machining the inner valve seat connection through hole wall of a type 4 bottle liner, the steps of which are as follows:

[0015] S1. Clamping:

[0016] First, place the inner liner vertically on the horizontal positioning reference block. The first drive device drives the left and right mounting seats to move inward synchronously until the left and right grippers hold the outer valve seat at the horizontal positioning reference block. Second, the second drive device drives the horizontal module to move vertically downward until the inner liner is held between the horizontal module and the horizontal positioning reference block. Finally, the first drive device drives the left and right mounting seats to open outward synchronously and then close inward synchronously. Repeat this operation 2 to 3 times.

[0017] S2. Automatic Detection Center:

[0018] Install a coordinate measuring machine probe on the tool mounting base, start the automatic detection center program built into the vertical boring machine, and automatically detect and center the inner hole of the external valve seat.

[0019] S3: Machining the wall of the through hole connecting the inner valve seat on the inner liner:

[0020] First, remove the coordinate measuring machine probe from the tool mount, install the inner bore roughing tool on the tool mount, adjust the servo rotary table speed to S3000~4000, adjust the tool feed rate to F1000, and machine the inner valve seat connection through hole to a diameter of 45.6mm; during the machining process, use compressed air to blow cold air onto the inner bore roughing tool;

[0021] Next, remove the rough boring tool from the tool mount and install the fine boring tool on the tool mount. Adjust the servo rotary table speed to S8000 and the tool feed rate to F300. Machin the inner valve seat connection through hole to a diameter of 46mm. During the machining process, use compressed air to blow cold air onto the fine boring tool.

[0022] Next, remove the internal boring tool from the tool holder, install a chamfering tool on the tool holder, and machine a chamfer at the top edge of the inner valve seat connecting through hole; during the machining process, use compressed air to blow cold air onto the chamfering tool;

[0023] Finally, remove the chamfering tool from the tool mount and install the internal boring tool on the tool mount. Adjust the servo rotary table speed to S10000 and machine the internal valve seat connection through hole to a diameter of 46.2mm in two passes (the tool is fed twice, with the same feed amount each time). During the machining process, compressed air is used to blow cold air onto the internal boring tool.

[0024] S4. The second drive device drives the horizontal module to move vertically upward, and the first drive device drives the left and right mounting seats to open outward simultaneously, releasing the inner liner. Then, the inner liner is rotated 180°. Steps S1 to S3 are repeated to complete the processing of the inner valve seat connection hole wall at the other end of the inner liner.

[0025] Furthermore, in the aforementioned method for processing the inner valve seat connection through hole wall of a type four bottle liner, the clamping surfaces of the left and right jaws are both V-shaped clamping surfaces.

[0026] Furthermore, in the aforementioned method for machining the inner valve seat connection through hole wall on the inner liner of a type four bottle, the clamping surfaces of the left and right jaws are both semi-circular arc-shaped clamping surfaces that correspond to and match the outer contour of the outer valve seat on the inner liner.

[0027] Furthermore, in the aforementioned method for processing the inner valve seat connection through hole wall of a type four bottle liner, the left and right grippers are made of plastic.

[0028] Furthermore, in the aforementioned method for processing the inner valve seat connection through hole wall of a type four bottle liner, the structure of the first driving device is as follows: a first driving cylinder is fixedly installed on the servo rotary table, a connecting seat is fixedly installed at the piston rod end of the first driving cylinder, and the connecting seat is installed on the servo rotary table through a central linear guide rail, wherein the central linear guide rail is perpendicular to the left linear guide rail.

[0029] A left sliding groove is provided at the left end of the connecting seat, and a first sliding groove is provided at the front end of the left mounting seat. The left connecting arm is hinged to the servo rotary table on the left side of the connecting seat. A first sliding bracket is hinged to one end of the left connecting arm and is movably installed in the left sliding groove. A second sliding bracket is hinged to the other end of the left connecting arm and is movably installed in the first sliding groove.

[0030] A right-side sliding groove is provided at the right end of the connecting seat, and a second sliding groove is provided at the front end of the right-side mounting seat. The right-side connecting arm is hinged to the servo rotary table on the right side of the connecting seat. A third sliding bracket is hinged to one end of the right-side connecting arm and is movably installed in the right-side sliding groove. A fourth sliding bracket is hinged to the other end of the right-side connecting arm and is movably installed in the second sliding groove.

[0031] As the piston rod of the first drive cylinder extends outward, it pushes the connecting seat to move closer to the horizontal positioning reference block, forcing the left connecting arm to rotate clockwise and the right connecting arm to rotate counterclockwise, thereby pushing the left and right mounting seats to open outward simultaneously. As the piston rod of the first drive cylinder retracts inward, it pushes the connecting seat to move away from the horizontal positioning reference block, forcing the left connecting arm to rotate counterclockwise and the right connecting arm to rotate clockwise, thereby pushing the left and right mounting seats to close inward simultaneously.

[0032] Furthermore, in the aforementioned method for processing the inner valve seat connection through hole wall of a type four bottle liner, the structure of the second driving device is as follows: a second driving cylinder is fixedly installed on the column, and the piston rod end of the second driving cylinder is fixedly connected to the tail head; during the process of the piston rod of the second driving cylinder extending outward, it pushes the tail head to move vertically upward along the guide rail of a pair of first linear guide rails; during the process of the piston rod of the second driving cylinder retracting inward, it pushes the tail head to move vertically downward along the guide rail of a pair of first linear guide rails.

[0033] Furthermore, in the aforementioned method for machining the inner valve seat connection through hole wall of a type four bottle liner, the structure of the third driving device is as follows: a third driving cylinder is fixedly installed on a vertical boring machine below the second through hole, and the piston rod end of the third driving cylinder is fixedly connected to the tool mounting seat; during the outward extension of the piston rod of the third driving cylinder, it pushes the tool mounting seat to move vertically upward along the guide rail of a pair of second linear guide rails, so that the tool on the tool mounting seat passes through the second through hole and the first through hole in sequence; during the inward retraction of the piston rod of the third driving cylinder, it pushes the tool mounting seat to move vertically downward along the guide rail of a pair of second linear guide rails.

[0034] Furthermore, in the aforementioned method for processing the inner valve seat connection through hole wall of a type four bottle liner, the elastic structure is as follows: an upper spring mounting groove, a support rod movable groove, and an adjustment groove are sequentially opened upwards on the bottom surface of the tail head; a lower spring mounting groove is opened downwards on the top surface of the horizontal module; the bottom of the support rod is fixed to the horizontal module at the lower spring mounting groove; the top of the support rod sequentially passes through the spring, the upper spring mounting groove, and the support rod movable groove before extending into the adjustment groove; a convex cap is provided at the end of the support rod extending into the adjustment groove; under the elastic force of the spring, the convex cap presses against the horizontal step surface between the adjustment groove and the support rod movable groove.

[0035] The beneficial effects of this invention are as follows: This application specifically designs a clamping fixture that can be applied to the vertical boring machine. By using the above method in combination with the clamping fixture, it can be ensured that the center line of the inner valve seat connecting through hole after clamping and machining is on the same straight line as the center line of the inner valve seat and the center line of the outer valve seat. This ensures that the coaxiality requirement of the inner valve seat connecting through hole and the outer valve seat on the machined inner liner is met, greatly increasing the product qualification rate to almost 100%. In addition, clamping and adjustment are very convenient, saving time and effort, increasing machining efficiency, and greatly reducing costs. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the inner liner after molding and processing.

[0037] Figure 2 yes Figure 1 A partial structural diagram of the inner liner and metal valve seat.

[0038] Figure 3 yes Figure 2 A partial structural diagram of the outer valve seat and the inner valve seat when they are separated.

[0039] Figure 4 This is a partial structural diagram of the vertical boring machine used in the machining method of the inner valve seat connection through hole of a type four bottle liner according to the present invention.

[0040] Figure 5 This is a schematic diagram of the elastic structure between the tail tip and the horizontal module.

[0041] Figure 6 yes Figure 4 A partially enlarged structural diagram of the clamping fixture in section A.

[0042] Figure 7 yes Figure 6 A partial structural diagram of the clamping fixture from a top-down view.

[0043] Figure 8 This is a partial structural diagram of another type of clamping fixture. Detailed Implementation

[0044] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments.

[0045] like Figure 1 , Figure 2 and Figure 3 As shown, the metal valve seat on the inner liner 1 consists of an outer valve seat 11 and an inner valve seat 12, as follows: Figure 2 and Figure 3 As shown, the outer valve seat 11 is directly bonded to the inner liner 1 during the molding process. After the inner liner 1 is molded, the wall of the inner valve seat connecting through hole 13 on the inner liner 1 needs to be machined to ensure that the inner valve seat 12 can be smoothly screwed onto the outer valve seat 11, and that the sealing ring 14 on the inner valve seat 12 can be sealed against the wall of the inner valve seat connecting through hole 13, thus ensuring the sealing performance between the outer valve seat 11 and the inner valve seat 12.

[0046] To ensure that the inner valve seat 12 can be smoothly screwed onto the outer valve seat 11 and that the sealing ring 14 on the inner valve seat 12 can seal against the wall of the inner valve seat connecting through hole 13, it is necessary to ensure that the center lines of the inner valve seat 12, the outer valve seat 11, and the inner valve seat connecting through hole 13 are all on the same straight line. Therefore, during the machining of the wall of the inner valve seat connecting through hole 13 on the inner liner 1, it is first necessary to ensure that the center lines of the inner valve seat 12, the outer valve seat 11, and the inner valve seat connecting through hole 13 are all on the same straight line after clamping. Secondly, it is necessary to ensure the coaxiality of the inner valve seat connecting through hole 13 and the outer valve seat 11 after machining. This application aims to achieve the above objectives by using a vertical boring machine 10 with a servo rotary table 2, designing a clamping fixture that can be applied to the vertical boring machine 10, and designing a machining method for the wall of the inner valve seat connecting through hole on the inner liner of a type IV bottle. The specific scheme is as follows.

[0047] like Figure 4 , Figure 6 As shown, in this embodiment, a clamping fixture is provided on the vertical boring machine 10 to clamp the vertically placed inner liner 1 onto the servo rotary table 2.

[0048] The structure of the clamping fixture is as follows: a horizontal positioning reference block 21 is fixedly installed on the servo rotary table 2 of the vertical boring machine. The top surface 211 of the horizontal positioning reference block 21 is a positioning reference surface. A first through hole 212 is opened downward in the middle of the top surface of the horizontal positioning reference block 21. A second through hole 22 is opened on the servo rotary table 2 at a position opposite to the first through hole 212.

[0049] like Figure 7 or Figure 8 As shown, the left mounting base 3 is mounted on the servo rotary table 2 to the left of the horizontal positioning reference block 21 via a pair of left linear guides. A left gripper 31 is fixedly installed at the right end of the left mounting base 3. The right mounting base 4 is mounted on the servo rotary table 2 to the right of the horizontal positioning reference block 21 via a pair of right linear guides. The left and right linear guides are parallel to each other. A right gripper 41 is fixedly installed at the left end of the right mounting base 4. A first drive device is also provided on the servo rotary table 2 to drive the left mounting base 3 and the right mounting base 4 to synchronously close inward or synchronously open outward.

[0050] like Figure 7 or Figure 8 As shown, the structure of the first driving device in this embodiment is as follows: a first driving cylinder 23 is fixedly installed on the servo rotary table 2, a connecting seat 24 is fixedly installed at the piston rod end of the first driving cylinder 23, and the connecting seat 24 is installed on the servo rotary table 2 through the middle linear guide rail, wherein the middle linear guide rail is perpendicular to the left linear guide rail.

[0051] A left sliding groove 241 is provided at the left end of the connecting seat 24, and a first sliding groove 32 is provided at the front end of the left mounting seat 3. The left connecting arm 25 is hinged to the servo rotary table 2 on the left side of the connecting seat 24. A first sliding bracket 251 is hinged to one end of the left connecting arm 25. The first sliding bracket 251 is movably installed in the left sliding groove 241. The first sliding bracket 251 can satisfy the purpose that when the left connecting arm 25 rotates around the hinge point between the left connecting arm 25 and the servo rotary table 2, the hinge point between the left connecting arm 25 and the first sliding bracket 251 can rotate relative to each other, and the first sliding bracket 251 slides in the left sliding groove 241 without dislodging from the left sliding groove 241. A second slide 252 is hinged to the other end of the left connecting arm 25. The second slide 252 is movably installed in the first slide groove 32. The second slide 252 can satisfy the purpose that when the left connecting arm 25 rotates around the hinge point between the left connecting arm 25 and the servo rotary table 2, the hinge point between the left connecting arm 25 and the second slide 252 can rotate relative to each other, and the second slide 252 slides in the first slide groove 32 without dislodging from the first slide groove 32.

[0052] A right slide groove 242 is provided at the right end of the connecting seat 24, and a second slide groove 42 is provided at the front end of the right mounting seat 4. The right connecting arm 26 is hinged to the servo rotary table 2 on the right side of the connecting seat 24. A third slide 261 is hinged to one end of the right connecting arm 26. The third slide 261 is movably installed in the right slide groove 242. The third slide 261 can satisfy the purpose that when the right connecting arm 26 rotates around the hinge point between the right connecting arm 26 and the servo rotary table 2, the hinge point between the right connecting arm 26 and the third slide 261 can rotate relative to each other, and the third slide 261 slides in the right slide groove 242 without dislodging from the right slide groove 242. A fourth slide 262 is hinged to the other end of the right connecting arm 26. The fourth slide 262 is movably installed in the second slide groove 42. The fourth slide 262 can satisfy the purpose that when the right connecting arm 26 rotates around the hinge point between the right connecting arm 26 and the servo rotary table 2, the hinge point between the right connecting arm 26 and the fourth slide 262 can rotate relative to each other, and the fourth slide 262 slides in the second slide groove 42 without dislodging from the second slide groove 42.

[0053] During operation, when the piston rod of the first drive cylinder 23 extends outward, it pushes the connecting seat 24 towards the horizontal positioning reference block 21, forcing the left connecting arm 25 to rotate clockwise and the right connecting arm 26 to rotate counterclockwise. This causes the left mounting seat 3 and the right mounting seat 4 to open outward simultaneously, at which point the left gripper 31 and the right gripper 41 also open outward simultaneously. When the piston rod of the first drive cylinder 23 retracts inward, it pushes the connecting seat 24 away from the horizontal positioning reference block 21, forcing the left connecting arm 25 to rotate counterclockwise and the right connecting arm 26 to rotate clockwise. This causes the left mounting seat 3 and the right mounting seat 4 to close inward simultaneously, at which point the left gripper 31 and the right gripper 41 also close inward simultaneously.

[0054] A more preferred embodiment is that the clamping surfaces of the left jaw 31 and the right jaw 41 can be V-shaped clamping surfaces 100, such as... Figure 7 As shown. In addition, the clamping surfaces of the left jaw 31 and the right jaw 32 can also be semi-circular arc-shaped clamping surfaces 200 that correspond to and match the outer contour of the outer valve seat 11 on the inner liner 1, such as... Figure 8 As shown.

[0055] A more preferable option is that the left gripper 31 and the right gripper 41 are made of plastic. This can better protect the outer valve seat 11 on the inner liner 1 and prevent the clamped part of the outer valve seat 11 from being damaged.

[0056] The tailstock 5 is mounted on the column 101 of the vertical boring machine via the first linear guide rail, and the tailstock 5 is driven by the second drive device. Under the drive of the second drive device, the tailstock 5 rises or falls vertically via the pair of first linear guide rails; the horizontal module 6 is mounted on the bottom of the tailstock 5 via an elastic structure.

[0057] In this embodiment, the structure of the second driving device is as follows: a second driving cylinder is fixedly installed on the column 101, and the piston rod end of the second driving cylinder is fixedly connected to the tail head 5. When the piston rod of the second driving cylinder extends outward, it pushes the tail head 5 to move vertically upward along one of the pair of first linear guides. When the piston rod of the second driving cylinder retracts inward, it pushes the tail head 5 to move vertically downward along one of the pair of first linear guides.

[0058] In this embodiment, as Figure 5As shown, the elastic structure is as follows: A spring upper mounting groove 51, a support rod movable groove 52, and an adjustment groove 53 are sequentially formed on the bottom surface of the tail head 5. A spring lower mounting groove 61 is formed on the top surface of the horizontal module 6. The bottom of the support rod 7 is fixed to the horizontal module 6 at the spring lower mounting groove 61. The top of the support rod 7 passes sequentially through the spring 8, the spring upper mounting groove 51, and the support rod movable groove 52 before extending into the adjustment groove 53. A convex cap 71 is provided at the end of the support rod extending into the adjustment groove 53. Under the elastic force of the spring 8, the convex cap 71 presses against the horizontal step surface 50 between the adjustment groove 53 and the support rod movable groove 52. When the tail head 5 clamps the vertically placed inner liner 1 downwards, the spring 8 provides a clamping buffer force, which not only better clamps the inner liner 1 but also protects the clamped part of the inner liner 1 from damage.

[0059] like Figure 4 As shown, the tool mounting base 9 is mounted on the vertical boring machine 10 below the second through hole 22 via a pair of second linear guides. The tool mounting base 9 is driven by a third drive device. Under the drive of the third drive device, the tool mounting base 9 rises vertically via the pair of second linear guides, passes through the second through hole 22 and the first through hole 212, and continues to move up and down, or descends vertically.

[0060] In this embodiment, the third driving device is structured as follows: a third driving cylinder is fixedly installed on the vertical boring machine 10 below the second through hole 22, and the piston rod end of the third driving cylinder is fixedly connected to the tool mounting seat 9. When the piston rod of the third driving cylinder extends outward, it pushes the tool mounting seat 9 vertically upward along one of the pair of second linear guides, causing the tool on the tool mounting seat 9 to pass upward through the second through hole 22 and the first through hole 212 in sequence. When the piston rod of the third driving cylinder retracts inward, it pushes the tool mounting seat 9 vertically downward along one of the pair of second linear guides.

[0061] This embodiment also includes a method for processing the inner valve seat connection through hole wall on the inner liner of a type four bottle. The diameter of the inner valve seat connection through hole 13 in the inner liner 1 taken out from the inner liner forming equipment is typically 25-50mm. The processing method includes the following steps:

[0062] S1. Clamping:

[0063] First, place the inner liner 1 vertically on the horizontal positioning reference block 21. The first driving device drives the left mounting seat 3 and the right mounting seat 4 to close inward simultaneously until the left gripper 31 and the right gripper 41 hold the outer valve seat 11 at the horizontal positioning reference block 21.

[0064] Secondly, the second drive device drives the tail head 5 to move downward, at which time the horizontal module 6 also moves vertically downward until the inner liner 1 is clamped between the horizontal module 6 and the horizontal positioning reference block 21.

[0065] Finally, the first drive device drives the left mounting base 3 and the right mounting base 4 to open outwards and then close inwards simultaneously, repeating this operation 2 to 3 times to complete the clamping.

[0066] The purpose of the first driving device driving the left mounting seat 3 and the right mounting seat 4 to open outwards and then close inwards synchronously 2 to 3 times is to ensure that the end face of the outer valve seat on the inner liner can be more closely attached to the positioning reference surface of the horizontal positioning reference block 21, thereby further improving the machining accuracy.

[0067] S2. Automatic Detection Center:

[0068] Install a coordinate measuring machine probe on the tool mounting base 9, start the automatic centering program built into the vertical boring machine 10, and automatically center the inner hole of the outer valve seat 11. After the centering is completed, the program in the vertical boring machine 10 obtains the centering data. These are built-in functions of the vertical boring machine, so they will not be described in detail here.

[0069] S3: Machining the wall of the through hole connecting the inner valve seat on the inner liner:

[0070] First, remove the coordinate measuring machine probe from the tool mounting base 9, install the inner hole rough boring tool on the tool mounting base 9, adjust the servo rotary table speed to S3000~4000, adjust the tool feed rate to F1000, and machine the inner valve seat connecting through hole 13 to a diameter of 45.6mm; during the machining process, use compressed air to blow cold air onto the inner hole rough boring tool;

[0071] Next, remove the rough boring tool from the tool mounting base 9, install the fine boring tool on the tool mounting base 9, adjust the servo rotary table speed to S8000, adjust the tool feed rate to F300, and machine the inner valve seat connection through hole 13 to a diameter of 46mm; during the machining process, use compressed air to blow cold air onto the fine boring tool.

[0072] Next, remove the internal boring tool from the tool mounting base 9, and install a chamfering tool on the tool mounting base 9. Chamfer 15 is machined at the top edge of the inner valve seat connecting through hole 13. The purpose of machining chamfer 15 is threefold: first, to remove burrs; second, to guide the lower section of the inner valve seat 12 into the inner valve seat connecting through hole 13 smoothly; and third, since the lower section of the inner valve seat 12 and the inner valve seat connecting through hole 13 are in an interference fit, the chamfered surface guides the sealing ring 14 to smoothly extend into the inner valve seat connecting through hole 13 along with the lower section of the inner valve seat 12, preventing the sealing ring 14 from getting stuck on the upper edge of the inner valve seat connecting through hole 13 or being damaged. Compressed air is used to blow cold air onto the chamfering tool during the machining process.

[0073] Finally, remove the chamfering tool from the tool mounting base 9, install the inner hole fine boring tool on the tool mounting base 9, adjust the servo rotary table speed to S10000, and machine the inner valve seat connecting through hole 13 to a diameter of 46.2mm in two passes; during the machining process, use compressed air to blow cold air onto the inner hole fine boring tool;

[0074] Blowing cold air onto the cutting tool during machining has two main benefits: first, it cools the machined surface; second, it removes waste chips from the machining process by placing them in a water tank, preventing them from affecting the surface finish.

[0075] S4. The second drive device drives the horizontal module 6 to move vertically upward, and the first drive device drives the left mounting seat 3 and the right mounting seat 4 to open outward simultaneously, releasing the inner liner 1. Then, the inner liner 1 is rotated 180°. Steps S1 to S3 are repeated to complete the processing of the inner valve seat connection hole wall at the other end of the inner liner 1.

[0076] In summary, this application specifically designs a clamping fixture applicable to this vertical boring machine. By using the above method in combination with the clamping fixture, it can be ensured that the center line of the inner valve seat connecting through hole 13, the center line of the inner valve seat 12, and the center line of the outer valve seat 11 are all on the same straight line after clamping and machining, thus ensuring that the coaxiality requirement of the inner valve seat connecting through hole 13 and the outer valve seat 11 on the machined inner liner 1 meets the standard. After machining a certain number of inner liners and testing, the results showed that 100% were qualified, greatly increasing the product qualification rate.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any modifications or equivalent changes made based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. A method for machining the inner valve seat connection through hole wall of a type four bottle liner, using a vertical boring machine with a servo rotary table, characterized in that: The vertical boring machine is equipped with a clamping fixture for mounting the vertically placed inner cylinder onto the servo rotary table. The structure of the clamping fixture is as follows: a horizontal positioning reference block is fixedly installed on the servo rotary table of the vertical boring machine. The top surface of the horizontal positioning reference block is the positioning reference surface. A first through hole is opened downward in the middle of the top surface of the horizontal positioning reference block. A second through hole is opened on the servo rotary table at the position opposite to the first through hole. The left mounting base is mounted on the servo rotary table to the left of the horizontal positioning reference block via a pair of left linear guides, and a left gripper is fixedly installed at the right end of the left mounting base; the right mounting base is mounted on the servo rotary table to the right of the horizontal positioning reference block via a pair of right linear guides, with the left and right linear guides parallel to each other, and a right gripper is fixedly installed at the left end of the right mounting base; a first drive device is also provided on the servo rotary table to drive the left and right mounting bases to synchronously close inward or synchronously open outward. The tailstock is mounted on the column of the vertical boring machine via the first linear guide rail, and is driven by the second drive device. Under the drive of the second drive device, the tailstock rises or falls vertically via a pair of first linear guide rails; the horizontal module is mounted on the bottom of the tailstock via an elastic structure. The tool mounting base is mounted on a vertical boring machine below the second through hole via a pair of second linear guides, and the tool mounting base is driven by a third drive device. Under the drive of the third drive device, the tool mounting base rises vertically via the pair of second linear guides, passes through the second through hole and the first through hole, and continues to move upward, or descends vertically. The processing method comprises the following steps: S1. Clamping: First, the inner liner is placed vertically on the horizontal positioning reference block. The first drive device drives the left and right mounting seats to close inward simultaneously until the left and right grippers hold the outer valve seat at the horizontal positioning reference block. Secondly, the second drive device drives the horizontal module to move vertically downward until the inner liner is clamped between the horizontal module and the horizontal positioning reference block. Finally, the first drive device drives the left and right mounting seats to open outwards and then close inwards simultaneously, repeating this operation 2 to 3 times. S2. Automatic Detection Center: Install a coordinate measuring machine probe on the tool mounting base, start the automatic detection center program built into the vertical boring machine, and automatically detect and center the inner hole of the external valve seat. S3: Machining the wall of the through hole connecting the inner valve seat on the inner liner: First, remove the coordinate measuring machine probe from the tool mount, install the inner bore roughing tool on the tool mount, adjust the servo rotary table speed S to 3000-4000, adjust the tool feed rate F to 1000, and machine the inner valve seat connection through hole to a diameter of 45.6mm; during the machining process, use compressed air to blow cold air onto the inner bore roughing tool; Next, remove the rough boring tool from the tool mount and install the fine boring tool on the tool mount. Adjust the servo rotary table speed S to 8000 and the tool feed rate F to 300. Machin the inner valve seat connection through hole to a diameter of 46mm. During the machining process, use compressed air to blow cold air onto the fine boring tool. Next, remove the internal boring tool from the tool holder, install a chamfering tool on the tool holder, and machine a chamfer at the top edge of the inner valve seat connecting through hole; during the machining process, use compressed air to blow cold air onto the chamfering tool; Finally, remove the chamfering tool from the tool mount and install the internal boring tool on the tool mount. Adjust the servo rotary table speed S to 10000. Feed the tool twice with the same feed amount. Machin the internal valve seat connection through hole to a diameter of 46.2mm. During the machining process, use compressed air to blow cold air onto the internal boring tool. S4. The second drive device drives the horizontal module to move vertically upward, and the first drive device drives the left and right mounting seats to open outward simultaneously, releasing the inner liner. Then, the inner liner is rotated 180°. Steps S1 to S3 are repeated to complete the processing of the inner valve seat connection hole wall at the other end of the inner liner.

2. The method for processing the inner valve seat connection through hole wall on the inner liner of a type four bottle according to claim 1, characterized in that: The clamping surfaces of the left and right jaws are both V-shaped.

3. The method for processing the inner valve seat connection through hole wall of a type four bottle liner according to claim 1, characterized in that: The clamping surfaces of the left and right jaws are both semi-circular arc-shaped clamping surfaces that correspond to and match the outer contour of the outer valve seat on the inner liner.

4. A method for machining the wall of the connecting through hole of the inner valve seat on the inner liner of a type four bottle according to claim 1, 2, or 3, characterized in that: The left and right grippers are made of plastic.

5. A method for machining the inner valve seat connection through hole wall on the inner liner of a type four bottle according to claim 1, 2, or 3, characterized in that: The structure of the first driving device is as follows: a first driving cylinder is fixedly installed on the servo rotary table, a connecting seat is fixedly installed at the piston rod end of the first driving cylinder, and the connecting seat is installed on the servo rotary table through the middle linear guide rail, wherein the middle linear guide rail is perpendicular to the left linear guide rail. A left sliding groove is provided at the left end of the connecting seat, and a first sliding groove is provided at the front end of the left mounting seat. The left connecting arm is hinged to the servo rotary table on the left side of the connecting seat. A first sliding bracket is hinged to one end of the left connecting arm and is movably installed in the left sliding groove. A second sliding bracket is hinged to the other end of the left connecting arm and is movably installed in the first sliding groove. A right-side sliding groove is provided at the right end of the connecting seat, and a second sliding groove is provided at the front end of the right-side mounting seat. The right-side connecting arm is hinged to the servo rotary table on the right side of the connecting seat. A third sliding bracket is hinged to one end of the right-side connecting arm and is movably installed in the right-side sliding groove. A fourth sliding bracket is hinged to the other end of the right-side connecting arm and is movably installed in the second sliding groove. As the piston rod of the first drive cylinder extends outward, it pushes the connecting seat to move closer to the horizontal positioning reference block, forcing the left connecting arm to rotate clockwise and the right connecting arm to rotate counterclockwise, thereby pushing the left and right mounting seats to open outward simultaneously. As the piston rod of the first drive cylinder retracts inward, it pushes the connecting seat to move away from the horizontal positioning reference block, forcing the left connecting arm to rotate counterclockwise and the right connecting arm to rotate clockwise, thereby pushing the left and right mounting seats to close inward simultaneously.

6. The method for processing the inner valve seat connection through hole wall on the inner liner of a type four bottle according to claim 1, characterized in that: The structure of the second driving device is as follows: a second driving cylinder is fixedly installed on the column, and the end of the piston rod of the second driving cylinder is fixedly connected to the tail head; when the piston rod of the second driving cylinder extends outward, it pushes the tail head to move vertically upward along the guide rail of a pair of first linear guide rails; when the piston rod of the second driving cylinder retracts inward, it pushes the tail head to move vertically downward along the guide rail of a pair of first linear guide rails.

7. A method for machining the inner valve seat connection through hole wall on a type four bottle liner according to claim 1 or 6, characterized in that: The structure of the third driving device is as follows: a third driving cylinder is fixedly installed on a vertical boring machine below the second through hole, and the piston rod end of the third driving cylinder is fixedly connected to the tool mounting seat; during the process of the piston rod of the third driving cylinder extending outward, it pushes the tool mounting seat to move vertically upward along the guide rail of a pair of second linear guide rails, so that the tool on the tool mounting seat passes through the second through hole and the first through hole in sequence; during the process of the piston rod of the third driving cylinder retracting inward, it pushes the tool mounting seat to move vertically downward along the guide rail of a pair of second linear guide rails.

8. The method for processing the inner valve seat connection through hole wall on the inner liner of a type four bottle according to claim 1, characterized in that: The elastic structure is as follows: an upper spring mounting groove, a support rod movable groove, and an adjustment groove are sequentially formed on the bottom surface of the tail head; a lower spring mounting groove is formed on the top surface of the horizontal module; the bottom of the support rod is fixed to the horizontal module at the lower spring mounting groove; the top of the support rod passes through the spring, the upper spring mounting groove, and the support rod movable groove in sequence and then extends into the adjustment groove; a convex cap is provided at the end of the support rod extending into the adjustment groove; under the elastic force of the spring, the convex cap presses against the horizontal step surface between the adjustment groove and the support rod movable groove.

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