Auxiliary tool for welding target material can cover
By designing auxiliary tooling for welding the target casing, and using support rods and ventilation components to support and transport argon gas, the problem of low welding efficiency of the casing was solved, achieving stable fixation and efficient welding.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TARFILM HI-TECH CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-07-24
AI Technical Summary
In the existing technology, the welding efficiency of the target sleeve cover is low, mainly because the end cover is inconvenient to fix and requires repeated clamping, which leads to cumbersome operation.
An auxiliary tooling for welding a target cover was designed, including a support base, a support rod, and a venting assembly. The support rod supports the target cover at the gap between adjacent folded edges, and the venting pipe delivers argon gas to form a protective gas layer, preventing oxidation and improving welding quality.
This method achieves stable fixation of the sleeve cover, avoids clamping operations, improves welding efficiency and pass rate, and reduces the labor intensity of workers.
Smart Images

Figure CN224543561U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of welding auxiliary tools, and in particular to an auxiliary tooling for welding a target sleeve cover. Background Technology
[0002] Hot isostatic pressing (HIP) technology boasts advantages such as low forming temperature, high density, uniform product density distribution, and excellent performance, making it one of the key technologies for target material preparation. The main process of HIP target material preparation involves loading well-mixed powder into a sleeve of a specific shape and size, evacuating the sleeve to a certain vacuum level, sealing it, and then placing it in a HIP press to achieve powder densification under appropriate temperature and pressure. The sleeve consists of a sleeve body and upper and lower end caps; the end caps of the rectangular columnar sleeve are formed by stamping or bending.
[0003] There are gaps between adjacent folds of the end cap, which need to be sealed by welding before welding to the casing. When welding adjacent folds using argon arc welding, the end cap first needs to be fixed, usually by clamping the folds with a vise. Since four gaps need to be welded, the clamping and fixing must be repeated four times, resulting in very low welding efficiency for the end cap. Utility Model Content
[0004] The purpose of this application is to overcome the above-mentioned technical problems and provide an auxiliary tooling for welding a target cover.
[0005] An auxiliary tooling for welding a target material sleeve cover is used to fix the sleeve cover. The sleeve cover includes a base plate and flanges around the base plate, with gaps formed between adjacent flanges. The support includes a bearing plate and a mounting sleeve formed on the upper surface of the bearing plate; The support rod is embedded in the mounting sleeve, and The ventilation assembly includes a ventilation pipe connected to one end of the support rod away from the bearing plate and support rods fixed on both sides of the ventilation pipe. The support rods are coplanar with the ventilation pipe and extend upward at an incline. One end of the ventilation pipe is used to introduce argon gas, and the other end of the ventilation pipe faces the gap.
[0006] By adopting the above scheme, when welding the sleeve cover, the vent pipe is supported at the gap between adjacent folds of the sleeve cover, and the support rods on both sides of the vent pipe are used to support the bottom surface of the sleeve cover to prevent the sleeve cover from rotating around the vent pipe. This allows the sleeve cover to be fixed without clamping, which facilitates the welding of the gap between adjacent folds. At the same time as welding, argon gas is introduced through the inlet pipe and delivered to the gap between the folds of the sleeve cover through the vent pipe. Helium gas can blow away impurities at the gap between the folds and form a protective gas layer during welding to prevent oxidation of the sleeve and avoid defects such as porosity and cracks, thereby improving the welding qualification rate.
[0007] In one embodiment, the sidewall of the mounting sleeve is provided with a first threaded hole and a first fastener that engages with the first threaded hole.
[0008] By adopting the above solution, the height of the ventilation component can be adjusted. After the support rod is adjusted to a suitable height, the first fastener is engaged with the first threaded hole. During the rotation, the first fastener can abut against the support rod, and the abutment force can be controlled.
[0009] In one embodiment, a connector is fitted onto the outer circumferential surface of the vent pipe, the connector being fixed at any position on the vent pipe, and the support rod located on both sides of the connector and at one end near the vent pipe being rotatably connected to the connector.
[0010] By adopting the above solution, the support of the venting assembly for the cover is made more stable. At the same time, the connector is fixed at different positions of the venting pipe, and the support rod is rotatably connected to the connector, which can ensure that the support rod can abut against the folded edge of the cover for cover of different sizes.
[0011] In one embodiment, the connector includes a mounting plate sleeved on the outer peripheral surface of the vent pipe. The mounting plate includes a limiting hole that mates with the outer peripheral surface of the vent pipe. The side wall of the mounting plate is provided with a limiting notch extending toward the outer wall of the mounting plate. Fastening plates are provided on both sides of the limiting notch. A first fastening bolt passes through the fastening plate, and a first fastening nut is sleeved on the extended end of the first fastening bolt.
[0012] By adopting the above scheme, tightening the first fastening bolt and the first fastening nut can either loosen the mounting plate so that it can slide along the vent pipe, or reduce the size of the limiting hole, thereby fixing the mounting plate to the vent pipe.
[0013] In one embodiment, the connector further includes mounting ears fixed to both sides of the mounting plate, a second fastening bolt passing through both the mounting ears and the support rod, and a second fastening nut fitted onto the extended end of the second fastening bolt.
[0014] By adopting the above scheme, the support rod can rotate around the second fastening bolt, and the cooperation between the second fastening bolt and the second fastening nut can fix the support rod.
[0015] In one embodiment, the support rod has a displacement block at one end away from the support base, the upper surface edge of the displacement block has a connecting plate, and the mounting plate has a rotating shaft on the side away from the fastening plate. The rotating shaft passes through the connecting plate and is perpendicular to the support rod and parallel to the plane of the ventilation assembly.
[0016] By adopting the above solution, the entire ventilation assembly can be rotated along the vertical plane, and the angle of the ventilation assembly in the vertical direction can be adjusted. This allows the cover to be adjusted to different vertical angles for welding, improving the comfort during welding.
[0017] In one embodiment, the mounting plate has a mounting groove on the side opposite to the fastening plate, the two ends of the rotating shaft pass through the side wall of the mounting groove, and a third fastening nut is fitted onto the extended end of the rotating shaft.
[0018] By adopting the above solution, the ventilation component can be adjusted in the vertical direction while also being fixed at that angle.
[0019] In one embodiment, the displacement block includes a lateral displacement plate and a longitudinal displacement plate, the connecting plate is located on the upper surface of the longitudinal displacement plate, the lateral displacement plate is located at the lower part of the longitudinal displacement plate, the upper surface of the longitudinal displacement plate is provided with an adjusting screw and a slide rail, the adjusting screw passes through the connecting plate, and the bottom surface of the connecting plate cooperates with the slide rail.
[0020] By adopting the above solution, the connecting plate can be moved along the length of the adjusting screw by rotating the lead screw. The connecting plate drives the entire ventilation assembly to move, thereby adjusting the position of the ventilation assembly in the extension direction of the adjusting lead screw.
[0021] In one embodiment, the upper surface of the transverse displacement plate is provided with a sliding groove, and a drive rack perpendicular to the adjusting screw is provided in the sliding groove. A drive gear that cooperates with the rack is embedded in the longitudinal displacement plate. The drive gear is sleeved on the drive rod, and the drive rod passes through the transverse displacement plate.
[0022] By adopting the above scheme, rotating the drive rod causes the drive gear to rotate, and the drive gear rolls along the extension direction of the rack. The lateral displacement plate drives the entire ventilation assembly to move, thereby adjusting the position of the ventilation assembly in the extension direction of the drive rack.
[0023] In one embodiment, the support rod has a mounting hole at one end away from the support base, the side of the mounting hole has a second threaded hole and a second fastener passing through the second threaded hole, and the bottom of the transverse displacement plate has a mounting rod that mates with the mounting hole.
[0024] By adopting the above solution, the rotation of the mounting rod in the mounting hole can drive the entire ventilation assembly to rotate in the horizontal direction, and the second fastener can fix the mounting rod when it is engaged with the second threaded hole.
[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. When welding the sheath cover, the vent pipe is supported at the gap between adjacent folds of the sheath cover. At the same time, the support rods on both sides of the vent pipe are used to support the bottom surface of the sheath cover to prevent the sheath cover from rotating around the vent pipe. This allows the sheath cover to be fixed in a fixed state without clamping, which facilitates the welding of the gap between adjacent folds. During welding, argon gas is introduced through the vent pipe and delivered to the gap between the folds of the sheath cover through the vent pipe. Helium gas can blow away impurities at the gap between the folds and form a protective gas layer during welding to prevent oxidation of the sheath and avoid defects such as porosity and cracks, thereby improving the welding qualification rate.
[0026] 2. Tightening the first fastening bolt and the first fastening nut can loosen the mounting plate, allowing it to slide along the vent pipe, or reduce the size of the limiting hole, thereby fixing the connector to the vent pipe. The connector is fixed at different positions on the vent pipe, and the support rod is rotatably connected to the connector, ensuring that the support rod can abut against the folded edge of the cover with different sizes.
[0027] 3. By rotating the lead screw, the connecting plate can be moved along the length of the adjusting screw. The connecting plate drives the entire ventilation assembly to move, thereby adjusting the position of the ventilation assembly in the extension direction of the adjusting lead screw. Rotating the drive rod drives the drive gear to rotate. The drive gear rolls along the extension direction of the rack, and the lateral displacement plate drives the entire ventilation assembly to move, thereby adjusting the position of the ventilation assembly in the extension direction of the drive rack. This allows for fine-tuning of the ventilation assembly's position during operation, improving the comfort of using the auxiliary tooling. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the structure of an auxiliary tooling for welding a target cover, as provided in this application.
[0029] Figure 2 This is an exploded view of an auxiliary tooling for welding a target cover, as provided in this application.
[0030] Figure 3 This is a structural diagram of the connector.
[0031] Figure 4 yes Figure 1 An enlarged view of region A.
[0032] Figure 5 This is an exploded view of the shift block.
[0033] Explanation of reference numerals in the attached drawings: 1. Support base; 11. Bearing plate; 12. Mounting sleeve; 121. First threaded hole; 122. First fastener; 2. Support rod; 21. Mounting hole; 211. Second threaded hole; 22. Second fastener; 3. Ventilation assembly; 31. Ventilation pipe; 311. Air inlet pipe; 32. Support rod; 4. Connector; 41. Mounting plate; 411. Limiting hole; 4111. Limiting notch; 412. Fastening plate; 4121. First fastening bolt; 4122. First fastening nut ; 413, Mounting slot; 414, Rotating shaft; 415, Third fastening nut; 42, Mounting ear; 421, Second fastening bolt; 422, Second fastening nut; 5, Displacement block; 51, Lateral displacement plate; 511, Sliding groove; 5111, Drive rack; 512, Mounting rod; 52, Longitudinal displacement plate; 521, Connecting plate; 522, Slide rail; 523, Adjusting screw; 524, Drive gear; 525, Drive rod; 6, Cover; 61, Base plate; 62, Folded edge; 63, Gap. Detailed Implementation
[0034] Therefore, it is necessary to provide an auxiliary tooling for welding the target sleeve cap, which facilitates fixing the sleeve end cap.
[0035] Please see Figure 1 , Figure 1 This is a schematic diagram of the auxiliary tooling for welding a target cover according to this application. The auxiliary tooling for welding a target cover provided in this application includes a support base 1, a support rod 2, and a venting assembly 3. The cover 6 includes a base plate 61 and flanges 62 around the base plate 61, with gaps 63 formed between adjacent flanges 62. The mounting sleeve 12 of the support base 1 is fitted into the support rod 2, which is connected to the venting assembly 3. The venting pipe 31 of the venting assembly 3 is supported at the gaps between adjacent flanges 62 of the cover 6. Simultaneously, the support rods 32 on both sides of the venting pipe 31 support the bottom surface of the cover 6, preventing the cover 6 from rotating around the venting pipe 31. This allows the cover 6 to remain fixed without clamping, achieving stable support for the cover 6, facilitating welding operations, and improving welding quality.
[0036] Please refer to the following: Figure 2 , Figure 2This is an exploded view of an auxiliary tooling for welding a target material sleeve cap provided in this application. The support base 1 includes a support plate 11 and a mounting sleeve 12. The support plate 11 is usually a flat plate structure, which can be made of metal. The mounting sleeve 12 is fixed to the upper surface of the support plate 11. Its shape is generally cylindrical, and its inner diameter is adapted to the support rod 2, which is convenient for the support rod 2 to be embedded. The mounting sleeve 12 can be firmly fixed to the support plate 11 by welding. The support rod 2 is a rod-shaped structure, which is generally made of metal material, such as aluminum alloy, which has good strength and lightness. The support rod 2 is embedded in the mounting sleeve 12. The side wall of the mounting sleeve 12 is provided with a first threaded hole 121 and a first fastener 122 that mates with the first threaded hole 121. The first fastener 122 can be a bolt. By rotating the bolt, it abuts against the support rod 2, thereby fixing the support rod 2 at the required height position, so that the height of the venting assembly 3 is adjustable and can meet the welding requirements of different specifications of sleeve caps 6. For example, when welding a higher cover 6, the support rod 2 can be stretched upward to a suitable height and then fixed with the first fastener 122. If the ventilation component 3 is too high and requires standing welding, the support rod 2 can be retracted downward.
[0037] The ventilation assembly 3 includes a ventilation pipe 31 and a support rod 32. The ventilation pipe 31 is a key component of the ventilation assembly 3; it connects to the end of the support rod 2 away from the bearing plate 11, typically via welding or threaded connection. The ventilation pipe 31 connects to an inlet pipe 311, which is usually a flexible rubber tube for easy gas delivery. The top of the ventilation pipe 31 abuts against two adjacent flanges 62, providing support and gas delivery during welding. When argon gas is introduced into the inlet pipe 311, it is delivered through the ventilation pipe 31 to the gap at the flange 62 of the sheath cover 6. Helium gas can purge impurities from the gap at the flange 62 and simultaneously forms a protective gas layer during welding, preventing oxidation of the sheath and avoiding defects such as porosity and cracks, thus improving the weld qualification rate.
[0038] Please refer to the following: Figure 3 , Figure 3This is a structural schematic diagram of the connector 4. The connector 4 is fitted onto the outer circumferential surface of the vent pipe 31 and can be fixed at any position on the vent pipe 31. The connector 4 includes a mounting plate 41 fitted onto the outer circumferential surface of the vent pipe 31. The mounting plate 41 has a limiting hole 411 that mates with the outer circumferential surface of the vent pipe 31. The side wall of the mounting plate 41 has a limiting notch 4111 extending towards the outer wall of the mounting plate 41. Fastening plates 412 are respectively provided on both sides of the limiting notch 4111. A first fastening bolt 4121 passes through the fastening plate 412, and a first fastening nut 4122 is fitted onto the extended end of the first fastening bolt 4121. By tightening the first fastening bolt 4121 and the first fastening nut 4122, the mounting plate 41 can be loosened or fixed on the vent pipe 31. When it is necessary to adjust the position of connector 4, loosen the fastening bolts and fastening nuts to enlarge the limiting hole 411. After moving the mounting plate 41 to the appropriate position, tighten the first fastening bolt 4121 and the first fastening nut 4122 to shrink the limiting hole 411, thereby fixing the mounting plate 41 to the vent pipe 31.
[0039] Support rod 32 is fixed on both sides of vent pipe 31 and is coplanar with vent pipe 31, extending upward at an angle. The end of support rod 32 near vent pipe 31 is rotatably connected to connector 4. Connector 4 also includes mounting ears 42 fixed on both sides of mounting plate 41. Second fastening bolt 421 passes through both mounting ears 42 and support rod 32, and a second fastening nut 422 is fitted onto the extended end of the second fastening bolt 421. In this way, support rod 32 can rotate around the second fastening bolt 421 and can be fixed at any position on vent pipe 31, allowing support rod 32 to abut against the folded edge 62 of cover 6 of different sizes, thus providing stable support for venting assembly 3 against cover 6 of different sizes. The material of support rod 32 can be the same as vent pipe 31, using metal, such as corrosion-resistant and high-strength stainless steel. The design of the support rod 32 being coplanar with the vent pipe 31 and extending upwards at an angle allows the support rod 32 to effectively support the bottom surface of the cover 6 and prevent the cover 6 from rotating around the vent pipe 31.
[0040] Please refer to the following: Figure 4-5 , Figure 5This is an exploded view of the displacement block 5. The mounting plate 41 has a mounting groove 413 on the side opposite to the fastening plate 412. The two ends of the rotating shaft 414 pass through the sidewalls of the mounting groove 413, and the extended end of the rotating shaft 414 has threads and a third fastening nut 415 that mates with the threads. Simultaneously, the support rod 2 has a displacement block 5 on the end opposite to the support base 1. The displacement block 5 includes a transverse displacement plate 51 and a longitudinal displacement plate 52 located above the transverse displacement plate 51. A connecting plate 521 is provided on the upper surface of the longitudinal displacement plate 52, and the rotating shaft 414 passes through the displacement plate, thereby enabling the mounting plate 41 to drive the ventilation assembly 3 to rotate around the rotating shaft 414. When the ventilation assembly 3 rotates around the rotating shaft 414, it can adjust the support angle for the cover 6. Tightening the third fastening nut 415 can fix the rotating shaft 414, thereby fixing the cover 6 at a suitable working angle and ensuring that the gap 63 is aligned with the operator. The upper surface of the longitudinal displacement plate 52 is provided with an adjusting screw 523 and a slide rail 522. The adjusting screw 523 passes through the connecting plate 521, and the bottom surface of the connecting plate 521 cooperates with the slide rail 522. A knob is provided at the end of the adjusting screw 523 away from the connecting plate 521. By turning the knob, the screw can be rotated, and the connecting plate 521 can be moved along the length direction of the adjusting screw 523. The connecting plate 521 drives the entire ventilation assembly 3 to move, thereby adjusting the position of the ventilation assembly 3 in the extension direction of the adjusting screw 523.
[0041] The upper surface of the transverse displacement plate 51 is provided with a sliding groove 511, and a drive rack 5111 perpendicular to the adjusting screw 523 is provided in the sliding groove 511. A drive gear 524 that meshes with the rack is embedded in the longitudinal displacement plate 52. The drive gear 524 is sleeved on the drive rod 525, which passes through the transverse displacement plate 51. A knob may also be provided at the extended end of the drive rod 525. By turning the knob to rotate the drive rod 525, the drive rod 525 drives the drive gear 524 to rotate. The drive gear 524 rolls along the extension direction of the rack, and the transverse displacement plate 51 drives the entire ventilation assembly 3 to move, thereby adjusting the position of the ventilation assembly 3 in the extension direction of the drive rack 5111. In addition, the support rod 2 has a mounting hole 21 at one end away from the support base 1. The side of the mounting hole 21 has a second threaded hole 211 and a second fastener 22 passing through the second threaded hole 211. The bottom of the transverse displacement plate 51 has a mounting rod 512 that mates with the mounting hole 21. The mounting rod 512 can rotate in the mounting hole 21 to drive the entire ventilation assembly 3 to rotate in the horizontal direction. When the second fastener 22 mates with the second threaded hole 211, it can fix the mounting rod 512.
[0042] The implementation principle of this embodiment is as follows: Through the rational design and close cooperation of each component, the auxiliary tooling for welding the target cover 6 achieves stable support and precise positioning of the cover 6. The support base 1 provides a stable foundation, the support rod 2 is height-adjustable, and the ventilation component 3 can both support the cover 6 and deliver protective gas. During welding, workers no longer need to repeatedly clamp the folded edge 62 of the cover 6; they only need to place the cover 6 on the ventilation component 3 for fixation. The design of the connector 4 and the shifting block 5 allows the ventilation component 3 to be adjusted in multiple directions, greatly improving the applicability and flexibility of the tooling. Compared with traditional welding methods, it effectively solves the problem of inconvenient fixation of the cover 6 leading to low welding efficiency, significantly improves the welding qualification rate and efficiency, reduces the labor intensity of workers, and brings great convenience to the welding work of the target cover 6.
[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. An auxiliary tooling for welding a target material sleeve cover, used for fixing a sleeve cover (6), the sleeve cover (6) comprising a base plate (61) and flanges (62) around the base plate (61), with gaps (63) formed between adjacent flanges (62), characterized in that, include: The support base (1) includes a bearing plate (11) and a mounting sleeve (12) formed on the upper surface of the bearing plate (11); The support rod (2) is embedded in the mounting sleeve (12), and The ventilation assembly (3) includes a ventilation pipe (31) connected to one end of the support rod (2) away from the bearing plate (11) and support rods (32) fixed on both sides of the ventilation pipe (31). The support rods (32) are coplanar with the ventilation pipe (31) and extend upward at an incline. One end of the ventilation pipe (31) is used to introduce argon gas, and the other end of the ventilation pipe (31) faces the gap (63).
2. The auxiliary tooling for welding a target sleeve cover according to claim 1, characterized in that: The mounting sleeve (12) has a first threaded hole (121) on its side wall and a first fastener (122) that mates with the first threaded hole (121).
3. The auxiliary tooling for welding a target sleeve cover according to claim 1, characterized in that: A connector (4) is fitted on the outer circumferential surface of the vent pipe (31). The connector (4) can be fixed at any position of the vent pipe (31). The support rod (32) is located on both sides of the connector (4) and is rotatably connected to the connector (4) at one end near the vent pipe (31).
4. The auxiliary tooling for welding a target sleeve cover according to claim 3, characterized in that: The connector (4) includes a mounting plate (41) sleeved on the outer peripheral surface of the vent pipe (31). The mounting plate (41) includes a limiting hole (411) that mates with the outer peripheral surface of the vent pipe (31). The side wall of the mounting plate (41) is provided with a limiting notch (4111) extending toward the outer wall of the mounting plate (41). Fastening plates (412) are provided on both sides of the limiting notch (4111). A first fastening bolt (4121) passes through the fastening plate (412). A first fastening nut (4122) is sleeved on the extended end of the first fastening bolt (4121).
5. The auxiliary tooling for welding a target sleeve cover according to claim 4, characterized in that: The connector (4) also includes mounting ears (42) fixed on both sides of the mounting plate (41), and the second fastening bolt (421) passes through both the mounting ears (42) and the support rod (32). The extended end of the second fastening bolt (421) is fitted with a second fastening nut (422).
6. The auxiliary tooling for welding a target sleeve cover according to claim 4, characterized in that: The support rod (2) has a displacement block (5) at one end away from the support base (1). The upper surface edge of the displacement block (5) is provided with a connecting plate (521). The mounting plate (41) has a rotating shaft (414) on the side away from the fastening plate (412). The rotating shaft (414) passes through the connecting plate (521). The rotating shaft (414) is perpendicular to the support rod (2) and parallel to the plane of the ventilation assembly (3).
7. The auxiliary tooling for welding a target sleeve cover according to claim 6, characterized in that: The mounting plate (41) has a mounting groove (413) on the side away from the fastening plate (412). The two ends of the rotating shaft (414) pass through the side wall of the mounting groove (413), and a third fastening nut (415) is sleeved on the extended end of the rotating shaft (414).
8. The auxiliary tooling for welding a target sleeve cover according to claim 6, characterized in that: The displacement block (5) includes a transverse displacement plate (51) and a longitudinal displacement plate (52). The connecting plate (521) is located on the upper surface of the longitudinal displacement plate (52), and the transverse displacement plate (51) is located at the lower part of the longitudinal displacement plate (52). The upper surface of the longitudinal displacement plate (52) is provided with an adjusting screw (523) and a slide rail (522). The adjusting screw (523) passes through the connecting plate (521), and the bottom surface of the connecting plate (521) cooperates with the slide rail (522).
9. The auxiliary tooling for welding a target sleeve cover according to claim 8, characterized in that: The upper surface of the transverse displacement plate (51) is provided with a sliding groove (511), and a drive rack (5111) perpendicular to the adjusting screw (523) is provided in the sliding groove (511). A drive gear (524) that cooperates with the rack is embedded in the longitudinal displacement plate (52). The drive gear (524) is sleeved on the drive rod (525), and the drive rod (525) passes through the transverse displacement plate (51).
10. The auxiliary tooling for welding a target sleeve cover according to claim 9, characterized in that: The support rod (2) has a mounting hole (21) at one end away from the support base (1). The side of the mounting hole (21) has a second threaded hole (211) and a second fastener (22) passing through the second threaded hole (211). The bottom of the transverse displacement plate (51) has a mounting rod (512) that mates with the mounting hole (21).