Method for manufacturing a laminated welded lock cylinder housing

Abstract

The present application relates to a kind of laminated welding type lock cylinder housing manufacturing method, lock cylinder and lock cylinder, method includes: S1 plate stamping blank, stamping is obtained with the first hole site and welding slot gap of inner cavity profile, stamping sheet;S2 axial stacking group blank, rely on the number of stamping sheet to flexibly adjust lock cylinder housing total length by increasing or decreasing, and stamping sheet gap is spliced to form outer circumferential axial welding slot;S3 welding solid connection, welding filler welding slot is combined into blank by welding filler;S4 post-processing processing, polishing is polished to make the appearance of shell reach the quality of CNC turning piece;S5 shell inspection obtains finished lock cylinder shell.The present application is also matched with the preparation and assembly procedure of two structures of stainless steel connecting rod.The present application uses stamping-piling-welding process, reduces machining process, material utilization is high, production change type is convenient;Lock cylinder housing and connecting rod use stainless steel, and good anti-breaking performance is good, shell appearance can be comparable with traditional turning product, it is beneficial to lock cylinder mass production.

Description

Technical Field

[0001] This invention relates to the field of lock technology, specifically to a method for manufacturing a laminated welded lock cylinder housing, the lock cylinder housing, and the lock cylinder itself. Background Technology

[0002] The lock cylinder is the core opening and closing component of a door lock. Currently, most traditional lock cylinders on the market have their cylinder bodies directly machined from brass bars using a CNC machine tool. The connecting rod that accompanies this type of lock cylinder body is also made of brass.

[0003] The existing technology has the following main defects: First, the lock cylinder housing and connecting rod are made of brass. Brass has limited toughness and hardness. When the lock cylinder is dropped or subjected to a large vibration and impact, the middle part of the connecting rod is prone to breakage, which can cause mechanical failures such as lock cylinder jamming and inability to unlock. The actual reliability of the product is poor.

[0004] Secondly, traditional lock cylinder housings are formed by CNC machining of a single bar stock. The total length of the lock cylinder housing is directly determined by the blanking dimensions of the brass bar stock, resulting in a fixed length specification. If different lengths of lock cylinder housings need to be produced, the blank stock needs to be changed and the CNC machine tool's machining program needs to be readjusted, making product changeover a cumbersome process. At the same time, the CNC machining process generates a large amount of metal shavings and waste, resulting in low material utilization. The high price of copper raw materials and the long machining time contribute to high material and processing costs. The long CNC machining cycle time makes it difficult for overall production efficiency to meet the needs of mass production.

[0005] Third, in the traditional CNC turning process for lock cylinder housings, the first hole inside the housing used to assemble the tumbler cap requires subsequent drilling, milling and other machining processes to be formed, resulting in many processing steps; the production of lock cylinder housings of different specifications requires repeated hole processing, further reducing production efficiency.

[0006] Fourth, traditional lock cylinder housings consist of two independently machined parts: the housing itself and the connecting rod. There is a lack of a complete processing technology suitable for stamping and stacking the housing. Existing processes struggle to balance structural strength, appearance quality, and production costs. To accommodate various length specifications and impact resistance, higher processing costs are often required. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, the present invention aims to provide a method for manufacturing a laminated welded lock cylinder housing, comprising the following process steps: S1. Sheet metal stamping and blanking: Select stainless steel sheet as raw material, and use stamping die to stamp several stamped sheets of the same specifications in batches. Each stamped sheet is simultaneously stamped with the pre-formed lock housing inner cavity contour, the first hole for assembly, and the welding groove notch on the outer periphery of the housing. S2. Axial Stacking of Blanks: Multiple stamped sheets are aligned and stacked along the axial direction of the lock cylinder housing. The inner cavity contour, first hole, and welding groove notch of each stamped sheet are aligned and overlapped to form a lock cylinder housing blank. After stacking, the welding groove notches of each stamped sheet together form a welding groove that runs through all the stamped sheets along the outer periphery of the housing blank. The welding groove is opened around the upper, lower, front, and rear side walls of the housing blank. According to the target total length of the lock cylinder housing, a corresponding number of stamped sheets are selected to participate in the stacking. The total axial length of the lock cylinder housing is directly adjusted by increasing or decreasing the number of stamped sheets. S3. Welding and fastening: Continuous welding is carried out along the welding groove on the outer periphery of the shell. The welding molten material fully fills the internal gap of the welding groove, so that all the stacked stamped sheets are fused together by the welding molten material to form a lock core shell welding blank that cannot be relatively misaligned or moved. S4. Post-processing: Grinding and polishing the outer surface of the welded blank of the lock cylinder shell after welding to remove weld beads, welding protrusions and burrs, so that the outer surface of the lock cylinder shell is flat and smooth, and the finished product appearance reaches the surface quality of CNC turning of the lock shell. S5. Shell Inspection: The appearance and dimensions of the polished lock cylinder shell are inspected to obtain the finished laminated welded lock cylinder shell.

[0008] In this invention, further, in step S1, the first hole is directly formed by stamping the stamping sheet as a whole. After stamping, the first hole obtains a square hole segment that matches the ball bearing cap, without the need for subsequent CNC drilling and milling machining processes.

[0009] Furthermore, this invention also includes a connecting rod manufacturing process: The connecting rod is made of stainless steel and can be processed in two ways: the first is integral machining, which uses a stainless steel bar to be turned into a one-piece connecting rod; the second is lamination welding, which involves stamping several sub-pieces, aligning and stacking the sub-pieces, welding them into a connecting rod, and then fitting and fastening the rod sleeve to the outside of the connecting rod body to obtain a lamination connecting rod.

[0010] Furthermore, this invention also includes an assembly process for the lock cylinder housing and the connecting rod: when an integral connecting rod is used, the integral connecting rod is inserted into the interior of the stacked welded lock cylinder housing at least partially, and the end of the connecting rod extending into the lock cylinder housing is locked and limited by a plug; when a stacked connecting rod is used, the stacked connecting rod with a rod sleeve is inserted into the stacked welded lock cylinder housing to complete the positioning.

[0011] A lock cylinder housing is also provided, the lock cylinder housing comprising a plurality of stamped sheets stacked axially, wherein the outer peripheral wall of the lock cylinder housing is provided with welding grooves arranged axially, and each of the stamped sheets is welded and fixed through the welding grooves; The total length of the lock cylinder housing is adjustable by increasing or decreasing the number of stamped sheets; The connecting rod is at least partially adapted to be inserted into the lock cylinder housing; The lock cylinder housing and connecting rod are made of stainless steel.

[0012] A lock cylinder includes a lock cylinder housing and further includes: The lock cylinder contains a rotor, spring, pin nut, and pins. The rotor inside the lock cylinder is rotatably assembled inside the lock cylinder housing; The lock cylinder housing has several first holes arranged axially inside. The inner rotor of the lock core has several second holes along the axial direction that correspond to the first holes. A spring, a ball bearing cap, and a ball are sequentially assembled in the first hole. The other end of the spring elastically abuts against the bottom of the first hole. The head of the ball bearing cap is slidably adapted to the first hole, and the ball is slidably adapted to the second hole. When the key is inserted into the inner rotor of the lock cylinder, the connection between the pin cap and the pin is aligned with the connection between the first hole and the second hole, thereby allowing the inner rotor of the lock cylinder to rotate relative to the lock cylinder housing.

[0013] In this invention, the head of the ball bearing cap is square and its shape is adapted to the first hole. The part of the ball bearing cap other than the head is adapted to the second hole. The ball is cylindrical with a pointed head and its shape is adapted to the second hole. The pointed head is away from the side of the ball bearing cap and its tip is used to cooperate with the tooth shape of a key.

[0014] In this invention, the welding groove is further provided around the lock cylinder housing, and the welding molten material fills and fixes the adjacent stamped sheets together and grinds them flat.

[0015] Furthermore, in this invention, the connecting rod is an integral structure, with one end inserted into the lock cylinder housing and the end locked and fixed by a plug.

[0016] Furthermore, in this invention, the connecting rod is a stacked welded structure, consisting of several sub-pieces stacked and welded together, and also includes a rod sleeve, which is fitted and fixed to the outside of the connecting rod.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: Firstly, stainless steel sheets are stamped into thin sheets. Multiple stamped sheets are axially stacked to form a blank. The total axial length of the lock cylinder housing can be directly adjusted by increasing or decreasing the number of stamped sheets, without needing to change the processing blank or readjust the machine tool program. Changing between different length specifications is simple. Compared to traditional bar CNC turning, stamping significantly reduces metal chips and waste, greatly improving material utilization. Stamping is suitable for mass production, with a fast overall processing cycle, effectively reducing raw material and machining time costs. After stacking, a through-type welding groove is formed around the upper, lower, front, and rear sidewalls of the housing. All stamped sheets are fixed together by filling the welding groove with molten welding material. Subsequent grinding and polishing treatments result in a finished product with a surface quality comparable to traditional CNC-turned lock housings, balancing appearance and structural integrity. After welding, appearance and dimensional inspections are conducted to ensure a high yield rate.

[0018] Secondly, the first hole of the square hole segment with the matching ball bearing cap is formed simultaneously in the stamping and blanking step of the sheet metal. The first hole is formed integrally with the stamping sheet, eliminating the need for subsequent secondary machining processes such as CNC drilling and milling, reducing machining positions and steps, and further compressing the production cycle.

[0019] Thirdly, the process includes two manufacturing options for stainless steel connecting rods: either a one-piece connecting rod can be machined from stainless steel bars, or a stacked connecting rod can be obtained by stamping sub-pieces, stacking and welding them, and then fitting a rod sleeve; both connecting rods are made of stainless steel, which has superior hardness and toughness compared to traditional brass. During assembly, the one-piece connecting rod is locked and limited by a plug, while the stacked connecting rod relies on a rod sleeve to strengthen its structural strength.

[0020] Fourth, the stainless steel connecting rod is less prone to deformation and breakage under conditions of lock cylinder drop and vibration impact, which can avoid lock cylinder jamming and inability to unlock caused by connecting rod breakage, thus improving the overall reliability of the lock cylinder; the two connecting rod forming methods can be flexibly selected according to the factory equipment conditions, and the solution has strong compatibility.

[0021] Fifth, the lock cylinder housing is made of stamped thin sheets stacked axially, with welding molten material filling the axial welding grooves around it, fusing all the stamped thin sheets into a whole, effectively preventing misalignment and movement between the stamped thin sheets, resulting in high overall structural strength of the housing; the lock cylinder housing and connecting rod are all made of stainless steel, improving the lock cylinder's resistance to drops and impacts from the parts themselves; the length of the housing is adjustable by the number of stamped thin sheets, adapting to various door lock installation sizes.

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0023] Figure 1 This is a flowchart of the steps of the method of the present invention; Figure 2 This is a schematic diagram of the lock cylinder structure of the present invention; Figure 3 This is a cross-sectional schematic diagram of the lock cylinder of the present invention; Figure 4 This is an exploded structural diagram of one of the lock cylinder structures of the present invention; Figure 5 This is an exploded structural diagram of another structural form of the lock cylinder of the present invention. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0026] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] This embodiment provides a method for manufacturing a laminated welded lock cylinder housing, including the following process steps: S1. Sheet metal stamping and blanking: Select stainless steel sheet as raw material, and use stamping die to stamp several stamping sheets 10 with the same specifications in batch. Each stamping sheet 10 has a pre-formed lock housing inner cavity contour, assembly first hole 12 and welding groove 11 notch on the outer periphery of the housing. The stainless steel sheet used in this step can be a cold-rolled stainless steel sheet. The thickness of the sheet is preset according to the overall size of the lock core housing 1. The thickness tolerance between each stamped sheet 10 is kept consistent to ensure that the overall end face is flush after stacking. The stamping die adopts a high-precision composite stamping die. The forming of the lock housing inner cavity contour, the first hole 12, and the welding groove 11 notch can be completed simultaneously in a single stamping action, without the need to process each feature separately in multiple stamping processes. After the inner cavity of the lock case is formed, the basic outline of the receiving cavity of the inner rotor 3 of the lock cylinder is formed; the first hole 12 is the mounting hole for the subsequent receiving of the spring 4 and the ball bearing cap 5; the welding groove 11 notch is opened at the four edges of the stamped sheet 10, and the welding groove 11 notch is opened on the four sides of the upper, lower, front and back of each stamped sheet 10. The welding groove 11 notch on a single stamped sheet 10 is a partial concave structure, and a single stamped sheet 10 does not form a complete through groove. After the stamping is completed, the stamped sheets 10 are sorted uniformly, and defective stamped sheets 10 with cracks, missing materials, or deformation are rejected to ensure that the stamped sheets 10 entering the next process have qualified external dimensions.

[0029] S2. Axial Stacking Assembly: Multiple stamped sheets 10 are aligned and stacked along the axial direction of the lock cylinder housing 1. The inner cavity contour, first hole 12, and welding groove 11 notch of each stamped sheet 10 are aligned and overlapped to form a lock cylinder housing 1 blank. After stacking, the welding groove 11 notch of each stamped sheet 10 together form a welding groove 11 that runs axially through all the stamped sheets 10 along the outer periphery of the housing blank. The welding groove 11 is opened around the upper, lower, front, and rear side walls of the housing blank. According to the target total length of the lock cylinder housing 1, a corresponding number of stamped sheets 10 are selected to participate in the stacking. The axial total length of the lock cylinder housing 1 is directly adjusted by increasing or decreasing the number of stamped sheets 10. During the stacking operation, a special stacking fixture is used to... Each stamped sheet 10 is positioned and constrained to ensure that the circumferential angles of all stamped sheets 10 are completely aligned, avoiding circumferential offset and radial misalignment of the stamped sheets 10; after the inner cavity contours of each stamped sheet 10 are aligned vertically, they together form a complete and continuous internal cavity of the lock cylinder housing 1; the first holes 12 of each stamped sheet 10 are aligned with each other to form a continuous channel for mounting holes of spring 4-ball bearing cap 5 along the axial direction of the lock cylinder housing 1; the welding grooves 11 notches on the edges of each stamped sheet 10 are aligned vertically to form four complete welding grooves 11 that run through the entire lock cylinder housing 1 blank along the axial direction. The welding grooves 11 are open grooves facing outwards from the outer side of the housing blank to facilitate the subsequent filling of welding molten material. When producing lock cylinder housings 1 with different installation lengths, only the total number of stamped sheets 10 involved in stacking needs to be changed; to lengthen the lock cylinder housing 1, the number of stamped sheets 10 is increased; to shorten the lock cylinder housing 1, the number of stamped sheets 10 is decreased. Production of products with different lengths can be quickly switched without changing the blank, modifying the mold, or adjusting the machining program. After stacking, a simple clamp can be used to temporarily hold and fix the lock cylinder housing 1 blank, preventing the stamped sheets 10 from loosening or misaligning before entering the welding process.

[0030] S3. Welding and Fixing: Continuous welding is carried out along the welding groove 11 on the outer periphery of the shell. The welding molten material fully fills the internal gap of the welding groove 11, so that all the stacked stamped sheets 10 are fused together by the welding molten material to form a lock core shell 1 welding blank that cannot be relatively misaligned or moved. This welding step can be carried out by laser welding or argon arc welding. Continuous welding operations are carried out along the four axial welding grooves 11: upper, lower, front, and rear. During the welding operation, the welding heat source moves at a constant speed along the axial direction of the welding groove 11. The molten welding material fully flows into and fills the internal gap of the welding groove 11. The molten material also wets the sides of the two adjacent layers of stamped sheets 10. After the welding molten material cools and solidifies, all the stacked stamped sheets 10 are metallurgically bonded into an inseparable integral lock core shell 1 welding blank. After the welding molten material fills the welding groove 11, it can eliminate the mating gap between the layers of the stamped sheets 10, restrict radial movement, circumferential rotation, and axial separation between any two stamped sheets 10, and ensure the overall structural rigidity of the lock cylinder housing 1. During the welding process, the welding heat input is controlled to avoid excessive heat causing thermal deformation of the stamped sheets 10, and to prevent deformation of the inner cavity contour and the first hole 12 of the lock housing, which would affect the assembly accuracy of subsequent parts. After welding is completed, the welding blank of the lock cylinder housing 1 is naturally cooled to room temperature before being transferred to the next process.

[0031] S4. Post-processing: The outer surface of the welded blank of the lock cylinder housing 1 is ground and polished to remove weld beads, weld protrusions, and burrs, making the outer surface of the lock cylinder housing 1 smooth and flat, achieving the surface quality of a CNC-machined lock shell. The grinding process involves coarse grinding and fine grinding in stages. Coarse grinding mainly removes excess weld beads and large weld protrusions from the outer surface after welding. Fine grinding further smooths the outer surface of the housing and eliminates weld traces left at the welding groove 11. After grinding, polishing is performed to optimize the surface finish of the housing. After grinding and polishing, no obvious weld traces are visible on the outer periphery of the lock cylinder housing 1. The outer circular contour of the housing is smooth and flat, and the visual effect and surface finish are consistent with those of traditional brass rod CNC-machined lock shells. It can be used directly as a lock cylinder housing without additional appearance modification. During the post-processing, the grinding cutting amount is controlled to avoid excessive grinding that could damage the solidified weld molten material inside the welding groove 11 and prevent damage to the bonding strength between the stamped sheets 10.

[0032] S5. Shell Inspection: The polished lock cylinder shell 1 undergoes visual and dimensional inspection to obtain the finished laminated welded lock cylinder shell 1. The inspection includes both visual and dimensional checks. Visual inspection primarily checks for cracks, pores, polishing scratches, and burrs on the outer surface of the shell. Dimensional inspection checks the overall axial length of the lock cylinder shell 1, the inner cavity contour dimensions, the position of the first hole 12, and the outer diameter of the shell, confirming that all parameters meet the drawing tolerances. Simultaneously, a sample is taken to check the welding strength between the stamped sheets 10 to prevent incomplete welding or delamination. Qualified workpieces are the finished laminated welded lock cylinder shell 1, which can be transferred to subsequent component assembly processes. Unqualified workpieces are rejected and reworked.

[0033] In this embodiment, in step S1, the first hole 12 is integrally stamped and formed with the stamping sheet 10. After stamping, the first hole 12 obtains a square hole segment that matches the ball bearing cap 5, without the need for subsequent CNC drilling and milling machining processes. The square hole segment is provided on the side of the first hole 12 near the outer wall of the lock cylinder housing 1. This square hole segment is integrally stamped and formed during the stamping and blanking stage of the stamping sheet 10. The inner contour size of the square hole segment matches the square head shape of the ball bearing cap 5. After the ball bearing cap 5 is assembled into the first hole 12, the square hole segment can form a circumferential limit on the ball bearing cap 5 to prevent the ball bearing cap 5 from rotating or twisting inside the hole. Traditional lock housings require CNC drilling and milling to create square structures for the corresponding holes. This solution directly obtains square hole segments through stamping, completely eliminating secondary machining processes such as drilling and milling, reducing investment in processing equipment, and shortening processing time. The stamped square hole segments have good dimensional consistency. Under mass production conditions, the dimensional dispersion of the first hole 12 of each lock cylinder housing 1 is small, and the interchangeability and assembly of parts are better.

[0034] This embodiment also includes a connecting rod manufacturing process: the connecting rod is made of stainless steel and can be manufactured using two methods: the first method is integral machining, where a stainless steel bar is integrally machined to form an integral connecting rod; the second method is lamination and welding, where several sub-pieces 20 are stamped, stacked and welded together to form a connecting rod, and then a rod sleeve 21 is fitted and fastened to the outside of the connecting rod body to obtain a lamination connecting rod. As a key component bearing stress inside the lock cylinder, the connecting rod is entirely made of stainless steel. Compared to traditional brass, stainless steel has higher hardness and toughness, making it less prone to breakage at the center stress point when the lock cylinder is dropped or subjected to impact and vibration. The first integral machining method uses solid stainless steel bars as raw materials and is integrally machined on a lathe to directly produce the overall shape of the connecting rod, including the rod body, intermediate limiting step, and assembly end. The entire rod has no splicing gaps, high structural rigidity, and is suitable for production scenarios where the processing equipment has machining capabilities. The second method of lamination welding involves using a stamping process to mass-produce multiple uniformly sized sub-plates 20. These sub-plates 20 are sheet-like components. Multiple sub-plates 20 are aligned and stacked along the axial direction of the rod body, and then welded together to form the connecting rod body. A rod sleeve 21, made of stainless steel, is then fitted onto the outside of the connecting rod body using interference fitting or welding. The rod sleeve 21 covers the outside of the connecting rod body, further constraining the sub-plates 20 from separating and slipping, thus improving the overall bending and impact resistance of the lamination connecting rod. This lamination connecting rod solution fully utilizes the advantages of the stamping process, reduces bar cutting waste, and is suitable for production scenarios lacking large bar turning equipment. Both connecting rod forming methods can be flexibly selected based on the factory's existing equipment conditions.

[0035] In this embodiment, the assembly process of the lock cylinder housing 1 and the connecting rod is also included: when an integral connecting rod is used, at least part of the integral connecting rod is inserted into the interior of the laminated welded lock cylinder housing 1, and the end of the connecting rod extending into the lock cylinder housing 1 is locked and limited by a plug; when a laminated connecting rod is used, the laminated connecting rod with the rod sleeve 21 is inserted into the laminated welded lock cylinder housing 1 for positioning. During the assembly of the connecting rod, a part of the connecting rod is housed inside the cavity of the laminated welded lock cylinder housing 1, and another part of the rod extends outward from the outside of the lock cylinder housing 1 to cooperate with the internal transmission mechanism of the door lock. When assembling an integrated connecting rod, the assembly end of the connecting rod is inserted into the lock cylinder housing 1 through the corresponding end opening. Then, a plug is installed at the end of the lock cylinder housing 1, which is snapped or threaded into the end opening of the lock cylinder housing 1. The plug presses against the end face of the connecting rod extending into the housing, achieving axial locking and limiting of the connecting rod, preventing the integrated connecting rod from loosening and exiting from the lock cylinder housing 1. When assembling a stacked connecting rod, the rod sleeve 21 is pre-fastened to the outside of the connecting rod body to form an integral component. The entire component is inserted into the lock cylinder housing 1 through the end opening. Radial positioning is achieved through the fit between the outer circle of the rod sleeve 21 and the inner cavity of the lock cylinder housing 1. A retaining ring and a plug can be used to achieve axial limiting of the stacked connecting rod. After assembly, the connecting rod is fixed in position within the lock cylinder housing 1, preventing loosening and movement, ensuring the stability and reliability of the lock cylinder transmission structure.

[0036] Another embodiment provides a lock cylinder housing 1, which includes a plurality of stamped sheets 10 stacked along the axial direction. The stamped sheets 10 are sheet-like components integrally formed by stamping process, abandoning the traditional CNC integral turning processing mode of brass bars. The stamped sheets 10 can be mass-produced by stamping, with fast processing speed and less scrap generated in the production process.

[0037] Several stamped sheets 10 are sequentially aligned and stacked along the axial direction of the lock cylinder housing 1, and together they enclose the internal cavity of the lock cylinder housing 1. The outer peripheral wall of the lock cylinder housing 1 is provided with welding grooves 11 arranged along the axial direction. The welding grooves 11 arranged along the axial direction penetrate the side wall of each stacked layer of stamped sheets 10, providing a filling position for the welding molten material. Each stamped sheet 10 is welded and fixed by welding through the welding grooves 11. The multiple layers of stacked stamped sheets 10 are firmly combined into an inseparable integral housing by welding, avoiding misalignment and movement between the stamped sheets 10, and ensuring the overall structural strength of the housing.

[0038] The total length of the lock cylinder housing 1 can be adjusted by increasing or decreasing the number of stamped sheets 10. There is no need to change the processing blank or readjust the machining equipment parameters. The total length of the lock cylinder housing 1 can be flexibly adjusted by directly increasing or decreasing the number of stamped sheets 10 participating in the stacking according to the required total length of the housing. This adapts to various door lock installation sizes. Compared with the traditional CNC turning of lock housing, which must rely on the blanking size of the bar stock to determine the length of the lock housing, this method greatly reduces the changeover time for different specifications of products, reduces raw material waste, and effectively controls production and manufacturing costs.

[0039] It also includes a connecting rod 2, which is at least partially fitted into the lock cylinder housing 1. Part of the connecting rod 2 is housed within the internal space of the lock cylinder housing 1, while the other part extends outward from the lock cylinder housing 1. The lock cylinder housing 1 and the connecting rod 2 are made of stainless steel, unlike the brass material commonly used in traditional lock housings and connecting rods. Stainless steel has higher hardness and toughness; when the lock cylinder is dropped or subjected to significant vibration and impact, it can effectively prevent the connecting rod 2 from breaking at the stress point in the middle, eliminating lock cylinder jamming and inability to unlock normally caused by the breakage of the connecting rod 2, and significantly improving the overall impact resistance of the lock cylinder and the reliability of the product.

[0040] Another embodiment provides a lock cylinder, including a lock cylinder housing 1. The lock cylinder also includes: an inner rotor 3, a spring 4, a pin nut 5, and a pin 6. The lock cylinder housing 1 serves as the external base protection component of the lock cylinder, providing an installation reference and protection for the other components of the lock cylinder. The inner rotor 3 is the core rotating component that receives key drive and rotates. The spring 4 provides a continuous elastic pushing force for the pin nut 5 and the pin 6. The pin nut 5 and the pin 6 cooperate to form the locking and blocking assembly of the lock cylinder, realizing the locking and unlocking functions of the lock cylinder.

[0041] The inner rotor 3 of the lock cylinder is rotatably assembled inside the lock cylinder housing 1. The inner rotor 3 is coaxially arranged inside the cavity enclosed by the lock cylinder housing 1. A reasonable rotation gap is reserved between the outer wall of the inner rotor 3 and the inner wall of the lock cylinder housing 1, allowing the inner rotor 3 to rotate circumferentially inside the lock cylinder housing 1. When no valid key is inserted, the locking component will block the inner rotor 3, restricting its rotation. Several first holes 12 are arranged axially inside the lock cylinder housing 1. The first holes 12 are directly formed on the stacked stamped sheet 10 and can be stamped synchronously with the stamped sheet 10 without the need for subsequent additional CNC machining. The multiple first holes 12 are arranged sequentially at intervals along the axial direction of the lock cylinder housing 1. The first holes 12 are blind holes, and the bottom of the hole forms the abutment and limiting surface of the spring 4. The first holes 12 are used to accommodate the spring 4 and part of the ball bearing cap 5. The inner rotor 3 of the lock cylinder has a plurality of second holes 30 corresponding to the first holes 12 along the axial direction. The second holes 30 are located on the outer wall of the inner rotor 3 of the lock cylinder. The number and arrangement of the second holes 30 correspond one-to-one with the first holes 12 on the lock cylinder housing 1. The second holes 30 are used to accommodate the pins 6. When the lock cylinder is in the locked state, a part of the pins 6 will extend into the second holes 30, thereby forming a circumferential limit between the inner rotor 3 of the lock cylinder and the lock cylinder housing 1, preventing the inner rotor 3 of the lock cylinder from rotating.

[0042] A spring 4, a ball bearing cap 5, and a ball 6 are sequentially assembled in the first hole 12. The other end of the spring 4 elastically abuts against the bottom of the first hole 12. The head of the ball bearing cap 5 is slidably adapted to the first hole 12, and the ball 6 is slidably adapted to the second hole 30. Inside the first hole 12, from the bottom outwards, the spring 4, ball bearing cap 5, and ball 6 are sequentially installed. The bottom end of the spring 4 presses tightly against the bottom end face of the first hole 12, and the top end of the spring 4 applies a continuous outward elastic thrust to the ball bearing cap 5. Under the thrust of the spring 4, the ball bearing cap 5 further compresses the ball 6. The ball bearing cap 5 can slide back and forth along the hole wall of the first hole 12, and the ball 6 can slide back and forth along the hole wall of the second hole 30. In the locking condition, the spring 4 pushes the ball bearing cap 5 and the ball 6, so that part of the ball 6 is stuck inside the second hole 30, forming a mechanical lock. When the key is inserted into the inner rotor 3 of the lock cylinder, the connection between the pin 5 and the pin 6 is aligned with the connection between the first hole 12 and the second hole 30, allowing the inner rotor 3 to rotate relative to the lock cylinder housing 1. When the matching key is inserted into the keyhole of the inner rotor 3, the key teeth push the pin 6 upwards, causing the pin 6 and the pin 5 to compress the spring 4 synchronously towards the bottom of the first hole 12. This continues until the interface between the pin 5 and the pin 6 is aligned with the interface between the first hole 12 and the second hole 30. At this point, the pin 6 is completely disengaged from the second hole 30, and the inner rotor 3 is no longer constrained by the pin 6. The key can then rotate the inner rotor 3 to complete the unlocking action. After the key is removed, the spring 4 pushes the pin 5 and the pin 6 back to their original positions, and the pin 6 re-engages in the second hole 30, restoring the lock cylinder to its locked state.

[0043] In this embodiment, the head of the ball bearing cap 5 is square and its shape is adapted to the first hole 12. The part of the ball bearing cap 5 other than the head is adapted to the second hole 30. The ball 6 has a cylindrical structure with a pointed tip and its shape is adapted to the second hole 30. The pointed tip is away from the side of the ball bearing cap 5, and the tip is used to mate with the tooth shape of a key. The ball bearing cap 5 has a square head, and the first hole 12 has a corresponding matching square hole segment. The square mating structure can limit the circumferential rotation and displacement of the ball bearing cap 5 inside the first hole 12, preventing the ball bearing cap 5 from twisting and misaligning, causing a jamming failure. The cylindrical part of the ball bearing cap 5 other than the head can slide into the second hole 30. The structure adopts a cylindrical tip with the tip facing the key insertion side. The tip directly contacts the contour of the key teeth, and the height variation of the key teeth directly affects the tip of the pin 6, driving the pin 6 to retract. This structure is one implementation method. In addition, the pin 6 can also adopt a configuration specially designed for stamped lock shells. It can be set as a square column with a pointed bottom, or as a square end with a round end. The square structure at the upper end of the pin 6 can be adapted to the cavity directly formed by stamping the thin sheet 10 without additional machining. The round or pointed structure at the lower end can be compatible with traditional old-style keys and existing lock cylinder assembly structures on the market, without the need to redevelop the key system, which is conducive to mass production of the product.

[0044] In this embodiment, the welding grooves 11 are formed around the lock cylinder housing 1. The welding molten material fills and fixes the adjacent stamped sheets 10 together and grinds them flat. The welding grooves 11 are distributed on the upper, lower, front, and rear sides of the lock cylinder housing 1. During the welding operation, the welding molten material fully fills the inside of the welding grooves 11. After the molten solder cools and solidifies, it firmly fixes each layer of adjacent stamped sheets 10 into a complete whole. After the welding is completed, the outer surface of the lock cylinder housing 1 is ground to eliminate welding marks and weld beads. After grinding, the outer surface of the housing is flat and smooth, and the appearance quality of the finished product can reach the appearance effect of traditional CNC turning of the lock housing.

[0045] In this embodiment, the connecting rod 2 is an integral structure (round rod). One end of the connecting rod 2 is inserted into the lock cylinder housing 1 and the end is locked and fixed by a plug. The connecting rod 2 adopts an integrally machined structure with good structural rigidity. One end of the connecting rod 2 extends into the cavity of the lock cylinder housing 1, and a plug is assembled at the end of the housing. The plug is installed at the end opening of the lock cylinder housing 1.

[0046] As an optional implementation, the connecting rod 2 can also be configured as a stacked welded structure, consisting of several sub-pieces 20 stacked together and welded to form a whole. The sub-pieces 20 can be square pieces. The connecting rod 2 is also fitted with a fixing sleeve 21, which further enhances the overall structural strength of the connecting rod 2 and enriches the product processing implementation options.

[0047] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A method for manufacturing a laminated welded lock cylinder housing, characterized in that, The process includes the following steps: S1, sheet metal stamping and blanking: stainless steel sheet is selected as raw material, and several stamped sheets of the same specifications are prepared by batch stamping with stamping dies. Each stamped sheet is simultaneously stamped with the pre-formed lock housing inner cavity contour, the first hole for assembly, and the welding groove notch on the outer periphery of the housing. S2. Axial Stacking of Blanks: Multiple stamped sheets are aligned and stacked along the axial direction of the lock cylinder housing. The inner cavity contour, first hole, and welding groove notch of each stamped sheet are aligned and overlapped to form a lock cylinder housing blank. After stacking, the welding groove notches of each stamped sheet together form a welding groove that runs through all the stamped sheets along the outer periphery of the housing blank. The welding groove is opened around the upper, lower, front, and rear side walls of the housing blank. According to the target total length of the lock cylinder housing, a corresponding number of stamped sheets are selected to participate in the stacking. The total axial length of the lock cylinder housing is directly adjusted by increasing or decreasing the number of stamped sheets. S3. Welding and fastening: Continuous welding is carried out along the welding groove on the outer periphery of the shell. The welding molten material fully fills the internal gap of the welding groove, so that all the stacked stamped sheets are fused together by the welding molten material to form a lock core shell welding blank that cannot be relatively misaligned or moved. S4. Post-processing: Grinding and polishing the outer surface of the welded blank of the lock cylinder shell after welding to remove weld beads, welding protrusions and burrs, so that the outer surface of the lock cylinder shell is flat and smooth, and the finished product appearance reaches the surface quality of CNC turning of the lock shell. S5. Shell Inspection: The appearance and dimensions of the polished lock cylinder shell are inspected to obtain the finished laminated welded lock cylinder shell.

2. The manufacturing method of the laminated welded lock cylinder housing according to claim 1, characterized in that, In step S1, the first hole is formed directly by stamping the sheet as a whole. After stamping, the first hole obtains a square hole segment that matches the ball bearing cap, without the need for subsequent CNC drilling and milling machining processes.

3. The manufacturing method of the laminated welded lock cylinder housing according to claim 1, characterized in that, It also includes the connecting rod manufacturing process: The connecting rod is made of stainless steel and can be processed in two ways: the first is integral machining, which uses a stainless steel bar to be turned into a one-piece connecting rod; the second is lamination welding, which involves stamping several sub-pieces, aligning and stacking the sub-pieces, welding them into a connecting rod, and then fitting and fastening the rod sleeve to the outside of the connecting rod body to obtain a lamination connecting rod.

4. The manufacturing method of the laminated welded lock cylinder housing according to claim 3, characterized in that, It also includes the assembly process of the lock cylinder housing and the connecting rod: when using an integrated connecting rod, the integrated connecting rod is inserted into the interior of the stacked welded lock cylinder housing at least partially, and the end of the connecting rod that extends into the lock cylinder housing is locked and limited by a plug; when using a stacked connecting rod, the stacked connecting rod with a rod sleeve is inserted into the stacked welded lock cylinder housing to complete the positioning.

5. A lock cylinder housing, characterized in that, The lock cylinder housing is composed of several stamped sheets stacked along the axial direction. Welding grooves are provided on the outer peripheral wall of the lock cylinder housing along the axial direction, and each of the stamped sheets is welded and fixed through the welding grooves. The total length of the lock cylinder housing is adjustable by increasing or decreasing the number of stamped sheets; The connecting rod is at least partially adapted to be inserted into the lock cylinder housing; The lock cylinder housing and connecting rod are made of stainless steel.

6. A lock cylinder, characterized in that, Including the lock cylinder housing as described in claim 5, it further includes: The lock cylinder contains a rotor, spring, pin nut, and pins. The rotor inside the lock cylinder is rotatably assembled inside the lock cylinder housing; The lock cylinder housing has several first holes arranged axially inside. The inner rotor of the lock core has several second holes along the axial direction that correspond to the first holes. A spring, a ball bearing cap, and a ball are sequentially assembled in the first hole. The other end of the spring elastically abuts against the bottom of the first hole. The head of the ball bearing cap is slidably adapted to the first hole, and the ball is slidably adapted to the second hole. When the key is inserted into the inner rotor of the lock cylinder, the connection between the pin cap and the pin is aligned with the connection between the first hole and the second hole, thereby allowing the inner rotor of the lock cylinder to rotate relative to the lock cylinder housing.

7. A lock cylinder as described in claim 6, characterized in that, The head of the ball bearing cap is square and its shape is adapted to the first hole. The part of the ball bearing cap other than the head is adapted to the second hole. The ball is cylindrical with a pointed head and its shape is adapted to the second hole. The pointed head is away from the side of the ball bearing cap and its tip is used to cooperate with the tooth shape of a key.

8. A lock cylinder as described in claim 7, characterized in that, The welding grooves are formed around the lock cylinder housing. The welding molten material fills and fixes the adjacent stamped sheets together and grinds them flat.

9. A lock cylinder as described in claim 8, characterized in that, The connecting rod is an integral structure, with one end inserted into the lock cylinder housing and the end locked and fixed by a plug.

10. A lock cylinder as described in claim 9, characterized in that, The connecting rod is a stacked welded structure, consisting of several sub-plates stacked and welded together, and also includes a rod sleeve, which is fitted and fixed to the outside of the connecting rod.

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