A lock cylinder keyhole machining clamp
Patent Information
- Application Number
- CN202522215170.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-20
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-10-20
AI Technical Summary
[0004]本实用新型的目的在于提供一种锁芯钥匙孔加工夹具，以解决上述背景技术提出的目前锁芯在加工过程中因夹持不稳易发生周向转动，导致钥匙孔加工位置或角度偏差，影响加工精度和产品互配性的问题
[0011]与现有技术相比，本实用新型的有益效果是：该锁芯钥匙孔加工夹具能够实现对锁芯的周向防转定位，夹持稳定可靠，有效防止加工时工件转动，避免因增大夹紧力导致的变形，提高了钥匙孔的加工精度和一致性。该夹具通过定位块上的仿形限位槽与弹性夹持组件的配合，实现对锁芯外周的柔性贴合夹持，减小应力集中，通过辅助夹持机构中摆动夹爪从下方抵接锁芯底缘，并配合弹性复位件提供持续复位力，形成有效的周向止动结构，整体结构协同作用，显著提升了锁芯在铣削加工中的定位精度与装夹可靠性。
Smart Images
Figure CN224737799U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lock processing technology, specifically a keyhole processing fixture for lock cylinders. Background Technology
[0002] In the lock manufacturing process, the lock cylinder, as a core component, directly affects the lock's performance and security due to the precision of its keyhole machining. With the diversification and increasing precision of lock products, higher requirements are being placed on the machining of lock cylinder keyholes. Typically, keyhole forming is completed on a CNC milling machine or other specialized equipment, and stable clamping of the workpiece during machining is a crucial step in ensuring machining accuracy.
[0003] Currently, most common lock cylinder machining fixtures use V-blocks in conjunction with pressure plates or pneumatic clamping mechanisms to position and fix the lock cylinder body. While these fixtures can achieve basic clamping functions, they have a prominent problem in practical applications: since lock cylinders are mostly cylindrical or irregularly shaped with curved surfaces, they are prone to circumferential micro-rotation during clamping. Especially when the cutting force changes abruptly during the milling of narrow keyhole slots, even slight rotation of the workpiece can cause the keyhole slot to shift or deviate in angle, thus affecting the matching accuracy between the lock cylinder and the key. At the same time, to prevent rotation, existing fixtures often increase the clamping force, which can easily cause deformation of thin-walled lock cylinder parts, affecting machining quality and yield. Utility Model Content
[0004] The purpose of this utility model is to provide a keyhole machining fixture for lock cylinders, so as to solve the problem mentioned in the background art that the current lock cylinder is prone to circumferential rotation during the machining process due to unstable clamping, which leads to deviation in the machining position or angle of the keyhole, affecting the machining accuracy and product compatibility.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a keyhole machining fixture for a lock cylinder, comprising a base, with positioning blocks driven by cylinders on both sides of the top of the base, the clamping surface of the positioning blocks having a contouring limiting groove, an elastic clamping component embedded in the contouring limiting groove, the elastic clamping component comprising a plurality of clamping teeth arranged circumferentially, the clamping teeth having an elastic deformation groove between adjacent teeth, an auxiliary clamping mechanism in the middle of the base, the auxiliary clamping mechanism comprising a swinging claw and an elastic reset member symmetrically arranged below the lock cylinder, the swinging claw being hinged to a mounting hole inside the base via a rotating shaft, and the elastic reset member being connected between the tail of the swinging claw and the base.
[0006] Preferably, the inner wall of the contour limiting groove is provided with a plurality of guide cavities evenly distributed in the circumferential direction, and the back of the clamping tooth block is provided with a guide tenon that slides with the guide cavities, and the cross-section of the guide cavities is dovetail-shaped.
[0007] Preferably, the clamping surface of the clamping tooth block is provided with an interlaced micro-protrusion structure, the micro-protrusion structure being composed of multiple arc-shaped protrusions extending along the axial direction of the tooth block, the height of the protrusions being 0.15-0.25mm.
[0008] Preferably, the bottom of the elastic deformation groove is provided with a chip discharge through hole that extends into the inner cavity of the contour limiting groove, and the chip discharge through hole is inclined and the outlet is located on the outer side of the positioning block.
[0009] Preferably, the upper surface of the front end of the swing gripper is provided with an arc-shaped abutment surface that matches the outer periphery of the bottom edge of the lock cylinder, and a wear-resistant hard alloy sheet is embedded on the arc-shaped abutment surface.
[0010] Preferably, the elastic reset element is a tension spring, one end of which is attached to the connecting lug at the tail of the swing gripper, and the other end is fixed to the anchoring column on the inner side of the base.
[0011] Compared with existing technologies, the beneficial effects of this utility model are as follows: This lock cylinder keyhole machining fixture can achieve circumferential anti-rotation positioning of the lock cylinder, ensuring stable and reliable clamping, effectively preventing workpiece rotation during machining, avoiding deformation caused by increased clamping force, and improving the machining accuracy and consistency of the keyhole. The fixture achieves flexible and close clamping of the lock cylinder's outer circumference through the cooperation of the contour-fitting limiting groove on the positioning block and the elastic clamping component, reducing stress concentration. The swinging jaws in the auxiliary clamping mechanism abut against the bottom edge of the lock cylinder from below, and the elastic reset component provides continuous reset force, forming an effective circumferential stop structure. The overall structure works synergistically, significantly improving the positioning accuracy and clamping reliability of the lock cylinder during milling. Attached Figure Description
[0012] Fig. 1 This is a schematic diagram of a keyhole machining fixture for lock cylinders according to the present invention;
[0013] Fig. 2 This is a schematic diagram of the inner structure of the positioning block of a lock cylinder keyhole processing fixture according to the present invention;
[0014] Fig. 3 This is a schematic diagram of the auxiliary clamping mechanism of a lock cylinder keyhole processing fixture according to the present invention.
[0015] In the figure: 1. Base; 2. Positioning block; 3. Contour limiting groove; 31. Guide slide cavity; 32. Chip discharge through hole; 4. Elastic clamping assembly; 41. Clamping tooth block; 411. Guide tenon; 412. Micro-textured structure; 42. Elastic deformation groove; 5. Auxiliary clamping mechanism; 51. Swinging jaw; 511. Arc-shaped abutment surface; 512. Wear-resistant hard alloy sheet; 52. Elastic reset component. Detailed Implementation
[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0017] Please see Figs. 1-3This utility model provides a technical solution: a keyhole machining fixture for a lock cylinder, including a base 1. The base 1 has a mounting groove in the middle of its top. Positioning blocks 2 are driven by cylinders on both sides of the top of the base 1. The clamping surfaces of the positioning blocks 2 have contour-following limiting grooves 3. An elastic clamping assembly 4 is embedded in the contour-following limiting grooves 3. The elastic clamping assembly 4 includes multiple clamping teeth 41 arranged circumferentially. Each clamping tooth 41 has an arc-shaped clamping surface on its outer side that adapts to the outer contour of the lock cylinder. Elastic deformation grooves 42 are provided between adjacent clamping teeth 41. An auxiliary clamping mechanism 5 is provided in the middle of the base 1. The auxiliary clamping mechanism 5 includes swinging claws 51 symmetrically arranged below the lock cylinder and elastic reset members 52. The swinging claws 51 are telescopic structures, and their inner ends are hinged to the base 1 via a rotating shaft. Inside the mounting holes, the two ends of the rotating shaft are fixed to the side walls of the base 1. The swing gripper 51 has a shaft hole that fits with the clearance of the rotating shaft, enabling a rotatable connection. The elastic reset member 52 is connected between the tail of the swing gripper 51 and the base 1, and the front end of the swing gripper 51 extends upward and can abut against the outer periphery of the bottom edge of the lock cylinder from the radial downward direction to form a circumferential anti-rotation support. In this structure, when the cylinder drives the two side positioning blocks 2 to close in the middle, the contour limiting groove 3 on them performs radial positioning of the lock cylinder. Multiple clamping teeth 41 in the elastic clamping assembly 4 fit against the outer periphery of the lock cylinder through their arc-shaped clamping surfaces. The elastic deformation groove 42 allows each tooth to be independently fine-tuned, achieving uniform force clamping and avoiding deformation of the thin-walled lock cylinder due to concentrated clamping force. The auxiliary clamping mechanism in the middle of the base 1... In step 5, the swinging jaw 51 swings upward at its front end under the pulling force of the elastic reset member 52, providing support and abutment from below the bottom edge of the lock cylinder. Its arc-shaped abutment surface 511 matches the outer periphery of the bottom edge of the lock cylinder, forming a circumferential limiting fulcrum. When an instantaneous cutting force impact occurs during milling, the swinging jaw 51 can effectively resist the rotational tendency of the lock cylinder and prevent it from undergoing circumferential micro-rotation, thus ensuring that the lock cylinder maintains a stable spatial posture during processing. This solves the technical problem in the prior art where the lock cylinder is prone to rotation, requiring an increase in clamping force, which leads to workpiece deformation and affects the positional accuracy and angle consistency of the keyhole slot. The inner wall of the contour limiting groove 3 is provided with multiple guide cavities 31 evenly distributed circumferentially, and the back of the clamping tooth block 41 is provided with a guide protrusion that slides and engages with the guide cavities 31. The tenon 411, guide tenon 411, and clamping tooth block 41 are integrally formed. The cross-section of the guide slide cavity 31 is dovetail-shaped. When the clamping tooth block 41 contacts the outer periphery of the lock cylinder, the guide tenon 411 on its back slides synchronously along the dovetail-shaped guide slide cavity 31 on the inner wall of the contour limiting groove 3. The dovetail-shaped cross-section structure effectively restricts the tendency of the clamping tooth block 41 to disengage during the radial clamping process, ensuring that it can only move smoothly along the preset trajectory. This not only ensures that each clamping tooth block 41 is subjected to uniform force and fits consistently, but also enhances the guiding accuracy and structural stability of the overall clamping action, preventing tooth block displacement due to off-center loading or vibration, thereby improving the adaptive clamping effect on the outer contour of the lock cylinder. The clamping surface of the clamping tooth block 41 is provided with staggered micro-protrusion structure 412.The micro-textured structure 412 consists of multiple arc-shaped ridges extending along the axial direction of the tooth block. The height of the ridges is 0.15-0.25mm. This micro-textured structure 412 increases the friction between the clamping tooth block 41 and the outer surface of the lock cylinder during clamping, providing additional gripping force and ensuring the stability of the lock cylinder during processing. This ensures sufficient friction to prevent the lock cylinder from sliding while avoiding excessive protrusions that could cause indentations or damage to the lock cylinder surface. The bottom of the elastic deformation groove 42 is provided with a chip discharge hole 32 that penetrates into the inner cavity of the contour limiting groove 3. The chip discharge hole 32 is inclined and its outlet is located on the outer side of the positioning block 2. The chip-exiting through-hole 32 of this structure can effectively remove chips generated during the cutting process, preventing chips from accumulating in the contour-following limiting groove 3 and the elastic deformation groove 42, which would affect the clamping accuracy and stability. This ensures that the clamping teeth 41 can be freely adjusted and closely fit the outer contour of the lock cylinder, maintaining the optimal clamping state. The upper surface of the front end of the swing jaw 51 is provided with an arc-shaped abutment surface 511 that matches the outer periphery of the bottom edge of the lock cylinder. A wear-resistant hard alloy sheet 512 is embedded in the arc-shaped abutment surface 511. The wear-resistant hard alloy sheet 512 is fixed to the surface of the arc-shaped abutment surface 511 by laser cladding or brazing. This structure allows the lock cylinder to be positioned. When block 2 is clamped, the swing jaw 51, under the action of the elastic reset member 52, has its front end arc-shaped abutment surface 511 tightly fitted against the outer periphery of the bottom edge of the lock cylinder, achieving support from below and circumferential limiting. The curvature of the arc-shaped abutment surface 511 matches the bottom edge of the lock cylinder, ensuring good contact surface fit and uniform force distribution, effectively preventing the lock cylinder from rotating during milling. The wear-resistant carbide sheet 512 significantly improves the wear resistance and compressive strength of the contact parts, maintaining surface smoothness and dimensional stability during long-term and frequent clamping operations, avoiding a decrease in limiting accuracy due to wear. At the same time, the high friction characteristics of the carbide sheet further enhance the anti-rotation effect. To ensure the stability of the lock cylinder's posture during processing, the elastic reset element 52 is a tension spring. One end of the spring is attached to the connecting lug at the tail of the swing gripper 51, and the other end is fixed to the anchor post inside the base 1. This elastic reset element 52 provides a stable restoring force during the clamping process. When the lock cylinder is inserted or removed, the front end of the swing gripper 51 is pressed downwards, and the tension spring is stretched and stores elastic potential energy. Once the lock cylinder is removed, the elastic reset element 52 releases energy, pulling the tail of the swing gripper 51 so that it quickly returns to its initial support state around the pivot, ensuring accurate gripper position and sensitive response during the next clamping.
[0018] Working principle: When using this lock cylinder keyhole machining fixture, first, place the lock cylinder to be processed in the center position above the base 1 and install the groove, ensuring that the bottom of the lock cylinder is aligned with the arc-shaped contact surface 511 of the front end of the swinging jaw 51 in the auxiliary clamping mechanism 5. At this time, under the action of the elastic reset member 52, the front end of the swinging jaw 51 naturally lifts upward, ready to support the lock cylinder from below. Then, the cylinders on both sides drive the positioning blocks 2 to close in the middle, and the contour limiting groove 3 on the positioning block 2 begins to radially position the lock cylinder. As the positioning block 2 continues to approach, multiple clamping teeth 41 in the elastic clamping assembly 4 fit tightly against the outer periphery of the lock cylinder through their arc-shaped clamping surfaces, while the guide convex The tenon 411 slides smoothly along the dovetail-shaped guide cavity 31 on the inner wall of the contour limiting groove 3, ensuring accurate clamping. During this process, the elastic deformation groove 42 between the clamping teeth 41 allows each tooth to adjust its position according to the specific shape of the lock cylinder, achieving uniform force clamping. When the positioning block 2 is fully closed, the front end of the swing claw 51 has also fully abutted against the outer periphery of the bottom edge of the lock cylinder, providing additional circumferential anti-rotation support. Subsequently, the milling equipment is started to perform the keyhole machining operation. During this period, if any debris is generated, it will be discharged to the outer side of the positioning block 2 through the chip outlet hole 32 set at the bottom of the elastic deformation groove 42, keeping the clamping area clean, thus completing a series of tasks.
[0019] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A lock cylinder keyhole processing clamp, comprising a base (1), the top of which is provided with positioning blocks (2) on both sides driven by air cylinders, characterized in that: The clamping surface of the positioning block (2) is provided with a contour limiting groove (3), and the contour limiting groove (3) is embedded with an elastic clamping component (4). The elastic clamping component (4) includes a plurality of clamping teeth (41) arranged circumferentially. The clamping teeth (41) are provided with elastic deformation grooves (42) between adjacent clamping teeth (41). The base (1) is provided with an auxiliary clamping mechanism (5) in the middle. The auxiliary clamping mechanism (5) includes a swinging claw (51) and an elastic reset member (52) symmetrically arranged below the lock cylinder. The swinging claw (51) is hinged to the mounting hole inside the base (1) through a rotating shaft. The elastic reset member (52) is connected between the tail of the swinging claw (51) and the base (1).
2. A cylinder keyway machining fixture according to claim 1, wherein: The inner wall of the contour limiting groove (3) is provided with a plurality of guide cavities (31) evenly distributed along the circumference. The back of the clamping tooth block (41) is provided with a guide tenon (411) that slides with the guide cavity (31). The cross-section of the guide cavity (31) is dovetail shaped.
3. A cylinder keyway machining fixture according to claim 1, wherein: The clamping surface of the clamping tooth block (41) is provided with staggered micro-protrusion structure (412), which is composed of multiple arc-shaped protrusions extending along the axial direction of the tooth block, and the height of the protrusions is 0.15-0.25mm.
4. The lock cylinder keyway machining jig of claim 1 wherein: The bottom of the elastic deformation groove (42) is provided with a chip discharge through hole (32) that extends into the inner cavity of the contour limiting groove (3). The chip discharge through hole (32) is inclined and the outlet is located on the outer side of the positioning block (2).
5. The lock cylinder keyway machining jig of claim 1 wherein: The upper surface of the front end of the swing gripper (51) is provided with an arc-shaped abutment surface (511) that matches the outer periphery of the bottom edge of the lock cylinder, and a wear-resistant hard alloy sheet (512) is embedded on the arc-shaped abutment surface (511).
6. A lock cylinder keyway machining jig according to claim 1, wherein: The elastic reset component (52) is a tension spring, one end of which is attached to the connecting lug at the tail of the swing gripper (51), and the other end is fixed to the anchor column on the inner side of the base (1).