A stainless steel instrument housing necking mold

Abstract

This invention discloses a stainless steel instrument housing necking mold, relating to the field of mold technology. It includes an upper mold assembly with connecting rods on both sides, connected to the upper mold assembly by bolts. A guide block is provided at the bottom end of each connecting rod, fixedly connected to the connecting rod by bolts. A lower mold assembly is located below the upper mold assembly, used to fix the stainless steel instrument housing. During mold operation, the instrument housing blank is pre-positioned at the work position. A driving element drives the upper mold assembly downwards as a whole, causing the top plate to move along with the guide groove and module downwards, and synchronously feeding the guide block via the connecting rods. The guide block drives the telescopic block to radially contract and compress a third spring via an inclined surface, driving the top rod axially upwards via the connecting block. The top rod pushes the telescopic mold radially from the inside, completing the centering and clamping of the blank. This mechanical linkage achieves positioning without an external power source, avoiding forming defects caused by blank displacement.

Description

Technical Field

[0001] This invention relates to the field of mold technology, specifically to a stainless steel instrument housing necking mold. Background Technology

[0002] Stainless steel instrument housings, as crucial protective components for instrument equipment, are often processed using a stamping and necking process to achieve end-reduction forming. Due to the large production volume and high precision requirements, the mold is the core tooling that determines the housing processing quality and production efficiency. Currently, the traditional necking mold design used in the industry for stainless steel instrument housings is imperfect, gradually revealing many shortcomings in mass industrial production, thus hindering product yield and production line capacity improvement.

[0003] Existing traditional necking dies lack an automatic centering structure that works in conjunction with the mold closing action during blank clamping. The placement of instrument housing blanks mainly relies on manual alignment and positioning. Some dies require additional independent positioning drive components such as cylinders and hydraulic cylinders. This not only results in numerous peripheral pipelines and control components for the dies, increasing equipment investment costs, but also makes it easy for the housing to become skewed during manual alignment. After necking and forming, problems such as uneven wall thickness and excessive deviation in necking dimensions can lead to scrapping. The clamping process for a single workpiece consumes a lot of time, making it difficult to meet the needs of high-speed continuous stamping production.

[0004] Meanwhile, traditional molds lack built-in automatic lubrication mechanisms. Before stamping, the telescopic inner mold and the stainless steel shell can only rely on manual intermittent application of lubricating grease, resulting in inconsistent grease thickness and incomplete coverage. During the stamping process, dry friction between the mold and the shell is predominant, easily causing scratches and defects on the stainless steel shell surface, leading to a decrease in product appearance qualification rate. Furthermore, the long-term friction wear on the mold's working surface is severe, resulting in frequent replacement and maintenance of the telescopic mold and high mold maintenance costs for the factory.

[0005] In summary, existing traditional necking molds for stainless steel instrument housings suffer from practical problems such as cumbersome positioning structures and lack of automatic lubrication, which are not conducive to the large-scale mass production of instrument housings. Therefore, the development of a new type of linkage stainless steel instrument housing necking mold has practical application value. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a stainless steel instrument housing necking mold, which solves the problems mentioned in the background art, such as cumbersome positioning structure and lack of automatic lubrication in traditional stainless steel instrument housing necking molds.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a stainless steel instrument housing necking mold, comprising an upper mold assembly, connecting rods on both sides of the upper mold assembly, the connecting rods being connected to the upper mold assembly by bolts, a guide block at one bottom end of the connecting rod being fixedly connected to the connecting rod by bolts, a lower mold assembly below the upper mold assembly for fixing the stainless steel instrument housing, a lubrication assembly inside the lower mold assembly for lubricating the surface of the lower mold assembly, a base assembly at the bottom of the lower mold assembly for positioning the stainless steel instrument housing in conjunction with the lower mold assembly, a guide post on the surface of the base assembly, and a support spring fitted outside the guide post for supporting the lower mold assembly.

[0008] Preferably, the upper mold assembly includes a top plate, a limit post fixedly installed at the bottom of the top plate, a guide sleeve fixedly installed at the bottom of the top plate, a connecting plate between the top plate and the guide sleeve, the connecting plate being fixedly connected to the bottom of the top plate, a guide groove fixedly installed at the bottom of the connecting plate, and a module being installed inside the guide groove; the top plate achieves precise mold closing guidance by relying on the guide sleeve, the connecting plate securely connects the top plate and the guide groove, and when the stamping moves downward, the top plate precisely presses down on the lower mold base through the limit post. The overall assembly structure is compact and reliable, which can ensure that the guide groove and the module rise and fall synchronously and smoothly, avoid misalignment and shaking of the upper mold components, and ensure the stability of the subsequent necking forming dimensions.

[0009] Preferably, multiple modules are provided, and the outer surfaces of the modules are inclined. The modules are arranged in a ring-shaped pattern and are assembled into a cavity. The cavity formed by the modules matches the contour of the stainless steel instrument housing. One end of the cavity formed by the modules is constricted for forming the stainless steel instrument housing. The modules are slidably connected to the grooves on the inner wall of the guide groove, which are inclined and distributed in a ring-shaped, evenly spaced manner. During the pressing process of the upper mold, the inclined guide groove drives multiple sets of inclined, mating modules to converge synchronously towards the center along the inclined direction. The ring-shaped modules enclose and form a cavity that fits the shape of the instrument housing. The bottom constriction structure evenly squeezes the outer wall of the workpiece. The multi-lobed split structure converges evenly and is subjected to consistent force, effectively ensuring that the constriction shape of the instrument housing is regular and eliminating problems such as local deformation and inconsistent constriction size.

[0010] Preferably, the lower mold assembly includes a lower mold base, a limiting platform is fixedly installed on the surface of the lower mold base, and a limiting ring is provided inside the limiting platform. A support ring is provided on the top of the limiting ring. The support ring and the limiting ring are both fixedly connected to the lower mold base by bolts. A telescopic mold is provided inside the support ring. A sliding rod is fixedly installed at the bottom of the telescopic mold. The bottom of the sliding rod passes through the inside of a sliding groove. The sliding groove is opened on the surface of the lower mold base, and a spring ring is fitted on the outside of the telescopic mold. The limiting platform, the limiting ring, and the support ring cooperate layer by layer to achieve the initial limiting of the outer ring of the blank. When the push rod is lifted, the sliding rod slides along the sliding groove to drive the telescopic mold to open outward and internally support the inner wall of the instrument housing. After the top support force is removed, the spring ring pulls the telescopic mold to automatically close. After forming, the inner mold quickly detaches from the workpiece, which not only ensures the inner wall support strength during shrinkage but also facilitates the quick demolding and material removal of the workpiece.

[0011] Preferably, multiple sliding grooves are provided, and the interior of the sliding grooves slides in contact with the outer wall of the sliding rod. The sliding grooves are distributed in an annular, equally spaced pattern, and the sliding direction of the sliding rod inside the sliding groove is along the outward expansion path of the upper block. The telescopic blocks are distributed in an annular, equally spaced pattern, and there are gaps between the telescopic blocks. The telescopic blocks are slidably fitted together to form a shape consistent with the contour of the inner cavity of the stainless steel instrument housing. The annularly distributed sliding grooves limit the expansion trajectory of the sliding rod, so that each set of telescopic molds opens radially synchronously, providing multi-point uniform support to the inner wall of the housing. Combined with the inner cavity contour formed by the telescopic blocks, the instrument housing blank is centered in all directions, effectively preventing the housing from deviating or having uneven wall thickness in some areas during the stamping process.

[0012] Preferably, the lubrication assembly includes a lifting ring with a forming groove on its top surface. The forming groove has an annular structure. A retaining ring is provided on the outer side of one bottom end of the lifting ring. The retaining ring and the lifting ring are integrally formed, and the retaining ring slides in contact with the annular groove surface of the inner wall of the support ring. A second spring is embedded in the bottom of the lifting ring, and an annular groove is provided on the inner side of the lifting ring. A sponge is embedded in the annular groove on the inner side of the lifting ring, and the surface of the sponge has an annular protrusion structure. The sponge absorbs lubricating grease. When the housing is pressed down, the lifting ring slides down along the inner wall of the support ring and compresses the second spring. The embedded oil-absorbing sponge moves down and automatically applies lubricating grease to the outer wall of the telescopic mold. The forming groove engages with the bottom end of the housing to limit radial displacement. Automatic lubrication is completed by relying on the mold closing stroke, eliminating the need for manual oiling, reducing the probability of friction and scratches between the mold and the workpiece, and extending the service life of the mold.

[0013] Preferably, the base assembly includes a base body and a telescopic block. A third spring is provided below the telescopic block, with one end of the third spring contacting the telescopic block and the other end connected to the base body. Two telescopic blocks are provided, with a connecting block between them. The connecting block is fixedly installed outside the push rod. A fourth spring is provided outside the push rod, located between the lower mold base and the base body. A positioning post is fixedly installed on the surface of the base body. The positioning post slides inside the lower mold base, and its outer wall has an annular protruding structure for limiting the lower mold base. The guide block presses down to compress the telescopic block and shrinks the third spring, thereby pushing the connecting block and the push rod to lift and achieve external support positioning of the telescopic mold. After the upper mold is lifted, the third and fourth springs rebound in sequence, causing each part to reset. The positioning post provides vertical limit and guidance for the lower mold base, controlling the downward stroke of the lower mold and ensuring that the mold closing position is consistent each time, with stable and reliable positioning accuracy.

[0014] Preferably, both ends of the telescopic block have a sloping top structure, and the telescopic block slides in contact with the surface of the guide block. The top and bottom of one side of the guide block have an inclined structure. Strip grooves are opened on both sides of the telescopic block, and the strip grooves on both sides of the telescopic block slide in cooperation with the guide protrusions. The guide protrusions are fixedly installed on the surface of the base body. The vertical downward pressing force is converted into a horizontal lateral force by relying on the inclined surfaces of the guide block and the telescopic block. The guide protrusion cooperates with the sliding groove on the side of the telescopic block to restrict the movement direction of the telescopic block, ensuring that the telescopic block can only be horizontally retracted or opened. The inclined surface transmission is stable and smooth, realizing synchronous linkage between the upper mold and the lower mold for workpiece centering. The blank clamping and positioning can be completed without an additional power source.

[0015] This invention provides a stainless steel instrument housing necking mold. It has the following beneficial effects: During mold operation, the instrument housing blank is pre-positioned at the workstation. The drive element drives the upper mold assembly to move downwards as a whole. The top plate moves downwards along with the guide groove and the module, and the guide block is synchronously fed forward via the connecting rod. The guide block drives the telescopic block to retract radially through the inclined plane and compresses the third spring. The connecting block drives the ejector rod to rise axially. The ejector rod pushes the telescopic mold radially from the inside, completing the centering and clamping of the blank. Relying on mechanical linkage, positioning without an external power source is achieved, avoiding forming defects caused by blank displacement, optimizing the tooling structure, and improving the processing cycle. After the guide block passes the telescopic block mating position, the third and fourth springs rebound and reset in sequence. The ejector rod moves downwards and retracts, and the telescopic mold retracts under the action of the spring coil, freeing up the forming cavity space. The module continuously presses down, causing the billet to move synchronously downwards. The billet, under pressure, compresses the second spring and slides vertically. The oil-storing sponge inside the lifting ring slides relative to the outer wall of the telescopic mold, achieving automated and uniform lubrication. The forming groove engages with the bottom of the billet to achieve radial limiting. By integrating lubrication and secondary limiting during the mold closing stroke, friction damage is reduced, product forming quality is improved, and mold wear is delayed. The upper mold closes further, the limiting post presses down, the lower mold base moves down along the positioning post, and compresses the fourth spring. The ejector rod rises relative to the lower mold, opening the telescopic mold again to form internal support. The guide groove guides the module obliquely, driving it to converge radially synchronously. The instrument housing is plastically formed by the combined force of internal support and external extrusion. After the mold opens, all elastic elements reset, and the telescopic mold retracts under the traction of the spring coil to remove the material. Demolding is completed without any jamming of the workpiece. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall installation structure of the stainless steel instrument housing necking mold of the present invention; Figure 2 This is a schematic diagram of the overall external structure of the mold of the present invention; Figure 3 This is a schematic diagram of the internal cross-sectional assembly structure of the mold of the present invention; Figure 4 This is a schematic diagram of the overall disassembled structure of the mold of the present invention; Figure 5 This is a schematic diagram of the disassembled structure of the upper mold component of the present invention; Figure 6 This is a schematic diagram of the combined structure of the lower mold assembly and the lubrication assembly of the present invention; Figure 7 This is a schematic diagram of the overall assembly of the base component of the present invention; Figure 8 This is a schematic diagram of the cooperation structure between the telescopic block and the guide protrusion in the base body of the present invention; Figure 9 This is a partial structural diagram of the base assembly top rod, telescopic block, and fourth spring of the present invention; Figure 10 This is a schematic diagram of the disassembled structure of the lubrication component of the present invention.

[0017] In the diagram, 1. Upper mold assembly; 101. Top plate; 102. Limiting post; 103. Guide sleeve; 104. Connecting plate; 105. Module; 106. Guide groove; 2. Connecting rod; 3. Guide block; 4. Lower mold assembly; 401. Lower mold base; 402. Limiting platform; 403. Limiting ring; 404. Support ring; 405. Telescopic mold; 406. Sliding rod; 407. Sliding groove; 408. Spring ring; 5. Lubrication assembly; 501. Lifting ring; 502. Forming groove; 503. Snap ring; 504. Second spring; 505. Sponge; 6. Base assembly; 601. Base body; 602. Telescopic block; 603. Third spring; 604. Connecting block; 605. Fourth spring; 606. Push rod; 607. Positioning post; 608. Guide protrusion; 7. Guide post; 8. Support spring. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: Please see Figures 1-10 This invention provides a technical solution: a stainless steel instrument housing necking mold, comprising an upper mold assembly 1, connecting rods 2 on both sides of the upper mold assembly 1, the connecting rods 2 being connected to the upper mold assembly 1 by bolts, a guide block 3 at one bottom end of the connecting rod 2, the guide block 3 being fixedly connected to the connecting rod 2 by bolts, a lower mold assembly 4 below the upper mold assembly 1, the lower mold assembly 4 being used to fix the stainless steel instrument housing, a lubrication assembly 5 inside the lower mold assembly 4 being used to lubricate the surface of the lower mold assembly 4, a base assembly 6 at the bottom of the lower mold assembly 4, the base assembly 6 being used to cooperate with the lower mold assembly 4 to position the stainless steel instrument housing, a guide post 7 on the surface of the base assembly 6, and a support spring 8 fitted outside the guide post 7, the support spring 8 being used to support the lower mold assembly 4; This implementation scheme utilizes the mechanical linkage of the upper and lower molds to achieve automatic centering and clamping of the shell, eliminating the need for additional pneumatic or hydraulic positioning drive components. This eliminates manual alignment operations, effectively avoiding problems such as dimensional deviations and uneven shell wall thickness caused by blank offset. It shortens workpiece clamping time and improves continuous stamping production efficiency. At the same time, the built-in lubrication structure automatically completes oil lubrication of the mold contact surfaces through the mold closing and pressing stroke linkage, eliminating the need for manual intermittent oiling. The grease is applied evenly and comprehensively, reducing shell scratches and scratches caused by friction during the forming process and excessive mold wear, thus reducing mold maintenance and replacement costs. After forming, each component automatically resets and retracts due to spring force, eliminating the resistance between the workpiece and the mold, and achieving convenient and smooth demolding. This solves the problems of cumbersome and inefficient demolding and part removal in traditional molds.

[0020] Example 2: Referring to Figures 1-7 and Figure 9, this embodiment of the invention provides a technical solution: the upper mold assembly 1 includes a top plate 101, a limit post 102 fixedly installed at the bottom of the top plate 101, a guide sleeve 103 fixedly installed at the bottom of the top plate 101, a connecting plate 104 between the top plate 101 and the guide sleeve 103, the connecting plate 104 being fixedly connected to the bottom of the top plate 101, a guide groove 106 fixedly installed at the bottom of the connecting plate 104, and a module 105 disposed inside the guide groove 106; multiple modules 105 are provided, and the outer surface of the modules 105 is inclined, the modules 105 are arranged in a ring pattern, and the modules 105 are assembled into a cavity, and the cavity assembled by the modules 105 matches the contour of the stainless steel instrument housing, and one end of the bottom of the cavity assembled by the modules 105 is narrowed for forming the stainless steel instrument housing, the modules 105 are slidably connected to the groove on the inner wall of the guide groove 106, and the guide groove 105 is fixedly installed at the bottom of the top plate 101. The grooves on the inner wall of the groove 106 are inclined, and the grooves on the inner wall of the guide groove 106 are distributed in an annular pattern at equal intervals. The lower mold assembly 4 includes a lower mold base 401, a limiting platform 402 is fixedly installed on the surface of the lower mold base 401, and a limiting ring 403 is provided inside the limiting platform 402. A support ring 404 is provided on the top of the limiting ring 403. Both the support ring 404 and the limiting ring 403 are fixedly connected to the lower mold base 401 by bolts. A telescopic mold 405 is provided inside the support ring 404. The bottom of the telescopic mold 405 is fixedly installed with a slide rod 406. The bottom of the slide rod 406 is inserted into the slide groove 407. The slide groove 407 is opened on the surface of the lower mold base 401, and a spring ring 408 is fitted on the outside of the telescopic mold 405. Multiple slide grooves 407 are provided, and the inside of the slide groove 407 slides in contact with the outer wall of the slide rod 406. The slide grooves 407 are distributed in a ring with equal spacing, and the sliding direction of the slide rod 406 inside the slide groove 407 is in the direction of the outward expansion path of the upper side block. In this implementation scheme, when the mold is in use, the instrument housing blank is first placed on the outside of the mold. The external drive mechanism drives the top plate 101 of the upper mold assembly 1 to press down. The downward movement of the top plate 101 simultaneously moves the bottom module 105 and the guide groove 106 down together. During the downward movement of the module 105 and the guide groove 106, the connecting rods 2 on both sides are pulled to move downward synchronously. The connecting rods 2 further drive the bottom guide block 3 to follow downward. When the guide block 3 moves downward, its bottom surface first abuts against the end of the telescopic block 602. The continuous downward pressure forces the telescopic block 602 to retract into the inner cavity of the base body 601 and compress the third spring 603. During the inward movement of the telescopic block 602, it pushes the connecting block 604 upward in the vertical direction with the help of the inclined surface of the other end. The upward movement of the connecting block 604 drives the push rod 606 fixed inside it to move upward synchronously. The top of the push rod 606 extends into the gap between the telescopic molds 405 and pushes the telescopic molds 405 outward. The multiple sets of telescopic molds 405 open outward simultaneously to complete the outer instrument housing. The automatic centering and clamping positioning of the blank achieves precise positioning before blank forming, effectively avoiding defects such as forming size deviation and uneven shell wall thickness caused by blank offset. The top plate 101 continuously presses down, driving the connecting rod 2 to continue to move downward. The guide block 3 gradually crosses the limiting position of the telescopic block 602. After the compressed third spring 603 is released from the limit, it rebounds and drives the telescopic block 602 to reset outward. The fourth spring 605 uses its own elastic potential energy to press down on the connecting block 604 to achieve downward reset. The connecting block 604 simultaneously pulls the top rod 606 back down. After the top rod 606 disengages from the telescopic mold 405, the telescopic mold 405 retracts, making room for subsequent die-clamping and forming. The entire linkage structure relies on the downward stroke of the upper mold to achieve positioning, without the need for an additional separate blank positioning drive source. This simplifies the hydraulic or pneumatic supporting structure of the mold. The instrument shell blank is quickly centered before the upper mold downward forming process, shortening the clamping and positioning time of a single product and improving the production efficiency of continuous stamping forming of the instrument shell.

[0021] Example 3: See Figures 1-4 , Figures 7-9This invention provides a technical solution: the base assembly 6 includes a base body 601 and telescopic blocks 602. The telescopic blocks 602 are distributed in a ring with equal spacing, and there are gaps between them. The telescopic blocks 602 are slidably fitted to each other to form a shape consistent with the contour of the inner cavity of the stainless steel instrument housing. A third spring 603 is provided below the telescopic blocks 602. One end of the third spring 603 contacts the telescopic block 602, and the other end of the third spring 603 is connected to the base body 601. There are two telescopic blocks 602, and a connecting block 604 is provided between the two telescopic blocks 602. The connecting block 604 is fixedly installed on the outside of the top rod 606. A fourth spring 605 is provided, located between the lower mold base 401 and the base body 601. A positioning post 607 is fixedly installed on the surface of the base body 601. The positioning post 607 slides inside the lower mold base 401, and the outer wall of the positioning post 607 is provided with an annular protruding structure for limiting the lower mold base 401. The tops of both ends of the telescopic block 602 are sloped structures, and the telescopic block 602 slides in contact with the surface of the guide block 3. The top and bottom of one side of the guide block 3 are inclined structures. Strip grooves are opened on both sides of the telescopic block 602, and the strip grooves on both sides of the telescopic block 602 slide in cooperation with the guide protrusion 608 respectively. The guide protrusion 608 is fixedly installed on the surface of the base body 601. As module 105 and top plate 101 continue to move downwards, guide block 3 can be fitted onto guide post 7 for positioning. Simultaneously, limit post 102 can press down on lower mold base 401, allowing lower mold base 401 to move downwards and press down fourth spring 605. As lower mold base 401 moves downwards, push rod 606 will move relative to it inside telescopic mold 405, thereby opening telescopic mold 405 upwards again. When telescopic mold 405 is opened, it can stretch the spring ring 408 fitted on its outside, and module 105 will contract and gather along the oblique direction of guide groove 106. Through module 105, the outer wall of stainless steel instrument housing is extruded into a groove, and at the same time, the inner wall support of telescopic mold 405 can extrude the groove of stainless steel instrument housing outer wall into shape. After the groove on the outer wall of the stainless steel instrument housing is formed, each part springs back. During the springback process, the lower mold base 401 can move upward, and the ejector rod 606 moves relative to the telescopic mold 405. Moving downward, the telescopic mold 405 is brought together under the action of the spring ring 408, thus moving the telescopic mold 405 away from the inner wall of the stainless steel instrument housing. This completely eliminates the contact friction and jamming force between the mold and the workpiece. The formed stainless steel instrument housing is no longer constrained by the mold structure and can be directly and smoothly removed to complete the demolding operation.

[0022] Example 4: See Figures 1-4 , Figure 6 , Figure 10The present invention provides a technical solution: the lubrication component 5 includes a lifting ring 501, a forming groove 502 is formed on the top surface of the lifting ring 501, the forming groove 502 is annular, a retaining ring 503 is provided on the outer side of one bottom end of the lifting ring 501, the retaining ring 503 is an integral structure with the lifting ring 501, and the retaining ring 503 slides in contact with the annular groove surface of the inner wall of the support ring 404, a second spring 504 is embedded at the bottom of the lifting ring 501, and an annular groove is formed on the inner side of the lifting ring 501, a sponge 505 is embedded in the annular groove on the inner side of the lifting ring 501, and an annular protrusion structure is provided on the surface of the sponge 505, and the sponge 505 adsorbs lubricating grease inside; During the continuous downward movement of module 105 in this implementation scheme, module 105 is in close contact with the stainless steel instrument housing. As module 105 presses down, it simultaneously drives the entire stainless steel instrument housing downwards. The descending stainless steel instrument housing presses against the lifting ring 501 of the lubrication assembly 5, forcing the lifting ring 501 to shift downwards and compress the second spring 504 at its bottom. As the lifting ring 501 moves downwards vertically, the sponge 505 embedded inside it remains in contact with the outer surface of the telescopic mold 405, sliding relative to it. The lubricating grease absorbed inside the sponge 505 can be evenly applied to the outer wall surface of the telescopic mold 405, achieving automatic lubrication of the entire outer wall of the telescopic mold 405. Simultaneously, the forming groove 502 at the top of the lifting ring 501 can be fitted and inserted into the bottom of the stainless steel instrument housing, limiting and fixing the stainless steel instrument housing within the forming groove 502. This effectively restricts the radial and swaying displacement of the instrument housing during mold operation, ensuring the stability of the housing's placement. This linkage structure relies on the inherent stroke of the mold closing and pressing down to complete automatic lubrication and housing positioning, eliminating the need for additional manual lubrication and alignment operations. It can continuously reduce the friction between the contact surface of the telescopic mold 405 and the stainless steel instrument housing during the forming process, effectively avoiding defects such as mold outer wall wear, housing forming scratches, and tearing, significantly improving product forming quality. At the same time, it significantly reduces the wear and tear of the telescopic mold 405, effectively extending the overall service life of the mold, reducing the frequency of mold maintenance and replacement, and lowering production and maintenance costs.

[0023] Working principle: The external press drives the upper mold assembly 1 to move downwards as a whole. The top plate 101 moves the limiting post 102, guide sleeve 103, connecting plate 104, guide groove 106 and the circularly arranged module 105 downwards synchronously. The connecting rods 2 on both sides of the top plate 101, which are fixed by bolts, also descend, driving the guide block 3 connected by bolts at the bottom to move downwards synchronously. The upper and lower end faces of the guide block 3 are inclined. When pressed down, the inclined surface abuts against the telescopic block 602 of the slope structure of the base body 601. The telescopic block 602 retracts inwards under the lateral limiting guidance of the base guide protrusion 608, compressing the bottom third spring 603. The telescopic block 602 retracts inwards and squeezes the middle connecting block 604 to lift it upwards. The connecting block 604 drives the top of the fourth spring 605. Rod 606 extends upward, and the top of the push rod 606 enters the annularly arranged sliding groove 407 of the lower mold base 401. It pushes the sliding rod 406 and the telescopic mold 405 outward from the inside, and the telescopic mold 405 expands and stretches the outer spring ring 408. The stainless steel instrument shell blank placed on the support ring 404 is automatically tightened and centered from the inner cavity by the multi-point outward expansion of the telescopic mold 405, completing the workpiece clamping and positioning. The upper mold continues to descend, the guide block 3 passes the pressure position of the telescopic block 602, the third spring 603 rebounds and drives the telescopic block 602 to move outward and reset, the fourth spring 605 presses down the connecting block 604 and drives the push rod 606 to retract downward, and the spring ring 408 pulls the telescopic mold 405 to retract inward, making room for forming and processing.

[0024] Module 105 continuously presses down to clamp the upper surface of the stainless steel instrument housing, causing the entire housing to move downward synchronously. The bottom end of the housing presses against the lifting ring 501 of the lubrication component 5. The lifting ring 501 slides downward along the annular groove on the inner wall of the support ring 404 by means of the integrally formed retaining ring 503, and compresses the second spring 504 at the bottom of the lifting ring 501. The sponge 505, which absorbs lubricating grease, is embedded in the retaining groove on the inner side of the lifting ring 501. As the lifting ring 501 moves downward, it slides against the outer wall of the telescopic mold 405. The grease contained in the sponge 505 is evenly applied to the outer wall of the telescopic mold 405, realizing fully automatic lubrication of the mold contact surface before molding. The annular forming groove 502 on the top surface of the lifting ring 501 engages with the bottom end of the instrument housing, restraining the radial shaking and displacement of the housing and stabilizing the placement position of the workpiece.

[0025] The upper mold presses down further, and the limiting post 102 at the lower end of the top plate 101 presses against the lower mold base 401. The lower mold base 401 slides down along the positioning post 607 of the base body 601, compressing the support spring 8 and the fourth spring 605 outside the guide post 7. The downward movement of the lower mold base 401 causes the push rod 606 to rise relatively, pushing open the telescopic mold 405 again, which provides rigid support from the inner cavity of the instrument housing. Restricted by the inclined sliding groove 407 inside the guide groove 106, multiple outer inclined, ring-shaped modules 105 converge and retract towards the center along the inclined track, utilizing the modules The bottom constriction structure of 105 extrudes the outer wall of the stainless steel instrument housing from the outside. Under the combined action of the inner mold support and the outer mold extrusion, the constriction of the groove on the outer wall of the instrument housing is completed. After the forming is completed, the press drives the upper mold assembly 1 to lift and open the mold. The support spring 8, the fourth spring 605, the second spring 504, and the third spring 603 rebound and reset in sequence. The push rod 606 falls back, and the telescopic mold 405 retracts inward and separates from the inner wall of the workpiece under the action of the spring ring 408. The lifting ring 501 and the telescopic block 602 all return to their initial positions. The formed instrument housing is released from the clamping restraint and can be directly taken out to complete the demolding.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A stainless steel instrument housing necking mold, characterized in that: The assembly includes an upper mold assembly (1), on both sides of which are connected rods (2), which are connected to the upper mold assembly (1) by bolts. A guide block (3) is provided at one bottom end of the connecting rod (2), which is fixedly connected to the connecting rod (2) by bolts. A lower mold assembly (4) is provided below the upper mold assembly (1), which is used to fix the stainless steel instrument housing. A lubrication assembly (5) is provided inside the lower mold assembly (4), which is used to lubricate the surface of the lower mold assembly (4). A base assembly (6) is provided at the bottom of the lower mold assembly (4), which is used to cooperate with the lower mold assembly (4) to position the stainless steel instrument housing. A guide post (7) is provided on the surface of the base assembly (6), and a support spring (8) is fitted on the outside of the guide post (7), which is used to support the lower mold assembly (4).

2. The stainless steel instrument housing necking mold according to claim 1, characterized in that: The upper mold assembly (1) includes a top plate (101), a limit post (102) is fixedly installed at the bottom of the top plate (101), a guide sleeve (103) is also fixedly installed at the bottom of the top plate (101), a connecting plate (104) is provided between the top plate (101) and the guide sleeve (103), the connecting plate (104) is fixedly connected to the bottom of the top plate (101), a guide groove (106) is fixedly installed at the bottom of the connecting plate (104), and a module (105) is provided inside the guide groove (106).

3. The stainless steel instrument housing necking mold according to claim 2, characterized in that: Multiple modules (105) are provided, and the outer surface of the modules (105) is inclined. The modules (105) are arranged in a ring pattern. The modules (105) are assembled into a cavity, and the cavity assembled by the modules (105) matches the outline of the stainless steel instrument housing. The bottom end of the cavity assembled by the modules (105) is narrowed for forming the stainless steel instrument housing. The modules (105) are slidably connected to the inner wall groove of the guide groove (106), and the inner wall groove of the guide groove (106) is inclined. The inner wall groove of the guide groove (106) is distributed in a ring with equal spacing.

4. The stainless steel instrument housing necking mold according to claim 3, characterized in that: The lower mold assembly (4) includes a lower mold base (401), a limiting stage (402) is fixedly installed on the surface of the lower mold base (401), and a limiting ring (403) is provided inside the limiting stage (402). A support ring (404) is provided on the top of the limiting ring (403). The support ring (404) and the limiting ring (403) are both fixedly connected to the lower mold base (401) by bolts. A telescopic mold (405) is provided inside the support ring (404). A slide rod (406) is fixedly installed at the bottom of the telescopic mold (405). The bottom of the slide rod (406) is inserted into the slide groove (407). The slide groove (407) is opened on the surface of the lower mold base (401), and a spring ring (408) is fitted on the outside of the telescopic mold (405).

5. The stainless steel instrument housing necking mold according to claim 4, characterized in that: Multiple slide grooves (407) are provided, and the inside of the slide groove (407) slides in contact with the outer wall of the slide rod (406). The slide grooves (407) are distributed in a ring with equal spacing, and the sliding direction of the slide rod (406) inside the slide groove (407) is the direction of the outward expansion path of the upper block.

6. The stainless steel instrument housing necking mold according to claim 5, characterized in that: The lubrication assembly (5) includes a lifting ring (501), a molding groove (502) is provided on the top surface of the lifting ring (501), the molding groove (502) is annular, a retaining ring (503) is provided on the outer side of one bottom end of the lifting ring (501), the retaining ring (503) and the lifting ring (501) are an integral structure, and the retaining ring (503) slides in contact with the annular groove surface of the inner wall of the support ring (404), a second spring (504) is embedded at the bottom of the lifting ring (501), and an annular groove is provided on the inner side of the lifting ring (501), a sponge (505) is embedded in the annular groove on the inner side of the lifting ring (501), and an annular protruding structure is provided on the surface of the sponge (505), and the sponge (505) is adsorbed with lubricating grease.

7. The stainless steel instrument housing necking mold according to claim 6, characterized in that: The base assembly (6) includes a base body (601) and telescopic blocks (602). The telescopic blocks (602) are distributed in a ring with equal spacing, and there are gaps between the telescopic blocks (602). The telescopic blocks (602) are slidably fitted to each other to form a shape consistent with the contour of the inner cavity of the stainless steel instrument housing. A third spring (603) is provided below the telescopic blocks (602). One end of the third spring (603) contacts the telescopic block (602), and the other end of the third spring (603) is connected to the base body (601). The telescopic blocks (602) are provided with There are two, and a connecting block (604) is provided between the two telescopic blocks (602). The connecting block (604) is fixedly installed on the outside of the top rod (606). A fourth spring (605) is provided on the outside of the top rod (606). The fourth spring (605) is located between the lower mold base (401) and the base body (601). A positioning post (607) is fixedly installed on the surface of the base body (601). The positioning post (607) slides inside the lower mold base (401), and the outer wall of the positioning post (607) is provided with an annular protruding structure for limiting the lower mold base (401).

8. The stainless steel instrument housing necking mold according to claim 7, characterized in that: The top of both ends of the telescopic block (602) is a sloping structure, and the telescopic block (602) slides in contact with the surface of the guide block (3). The top and bottom of one side of the guide block (3) are both sloping structures. The telescopic block (602) has strip grooves on both sides. The strip grooves on both sides of the telescopic block (602) slide in cooperation with the guide protrusion (608). The guide protrusion (608) is fixedly installed on the surface of the base body (601).

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