A fixture for clamping a bar for a numerical control machine tool
By designing multiple clamping plates and sliding components in the CNC machine tool fixture, and utilizing semi-circular clamping slots and elastic elements, the problem of CNC machine tools being unable to clamp multiple bars at once has been solved, thus improving processing efficiency and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI QUNLI FASTENER MFG
- Filing Date
- 2025-07-30
- Publication Date
- 2026-06-26
AI Technical Summary
CNC machine tool fixtures cannot clamp multiple bars at once, resulting in low processing efficiency and requiring frequent manual feeding.
Design a fixture for CNC machine tools, comprising a base plate, a sliding assembly, and a clamping plate. The sliding assembly includes a guide rail and a slider. Multiple clamping plates are arranged in parallel. Multiple clamping spaces are formed by clamping multiple clamping plates through limiting members and sliders. The clamping plates are provided with semi-circular clamping grooves. Sliding rods and elastic members provide buffering force to ensure stable clamping.
It enables simultaneous clamping of multiple bars, reducing the number of manual loading operations, improving processing efficiency, avoiding clamping deformation and surface damage, and is easy to operate.
Smart Images
Figure CN224407008U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of CNC machine tool equipment, and in particular to a clamp for holding bar stock for CNC machine tools. Background Technology
[0002] Bar stock is a simple cross-sectional profile, typically delivered in straight bars. Bar stock varieties are categorized by cross-sectional shape, including round, square, hexagonal, and threaded steel bars for construction, but the most common cross-sectional shape is round. Bar stock can be milled or cut into various shafts, bolts, nuts, and other metal components. To ensure precision in bar stock processing, many manufacturers currently use CNC machine tools for machining.
[0003] In related technologies, when a CNC machine tool processes the end of a bar, the bar is placed in the working area of the CNC machine tool, and one end of the bar is clamped and fixed by a fixture to make the bar stand upright. Then, the CNC machine tool mills or cuts the end of the bar to process one end of the bar into the required shape.
[0004] Regarding the aforementioned technologies, current CNC machine tools use fixtures to clamp bar stock before processing. However, CNC machine tools typically only have one or two fixtures, and these fixtures cannot hold multiple bar stock at once. Therefore, a maximum of two bar stock can be processed per batch. Afterward, the unprocessed bar stock needs to be manually placed into the fixture and held in place. This process requires frequent manual feeding, resulting in low work efficiency. Therefore, this application proposes a fixture for clamping bar stock on a CNC machine tool. Utility Model Content
[0005] This application provides a clamp for holding bar stock in a CNC machine tool.
[0006] This application provides a clamp for holding bar stock in a CNC machine tool, which adopts the following technical solution:
[0007] A clamping fixture for holding bar stock in a CNC machine tool includes a base plate mounted on the CNC machine tool, a sliding assembly mounted on the base plate, and clamping plates slidably mounted on the sliding assembly. The sliding assembly includes a guide rail and a slider slidably mounted on the guide rail. The guide rail is mounted on the base plate, and multiple clamping plates are provided, each of which is slidably mounted on the guide rail and arranged parallel to each other. Limiting members are provided at both ends of the guide rail. When clamping a bar stock, the slider cooperates with the limiting members to clamp all the clamping plates.
[0008] By adopting the above technical solution, multiple clamping plates form multiple clamping spaces with each other. The bar is pre-placed between the multiple clamping plates, and the slider is driven to slide on the guide rail. The slider and the limiting component cooperate to clamp the multiple clamping plates. As the multiple clamping plates are clamped, the bar is also clamped. Multiple clamping spaces can clamp multiple bars at the same time, saving manual loading times and improving processing efficiency.
[0009] Preferably, the clamping plate has a clamping groove on the side near the adjacent clamping plate, and the clamping groove has a semi-circular cross-section; the clamping grooves of the two adjacent clamping plates cooperate to clamp the bar; when the two adjacent clamping plates cooperate to clamp the bar, there is a gap between the two adjacent clamping plates.
[0010] By adopting the above technical solution, the semi-circular clamping groove matches the shape of the bar, improving the clamping fit and stability; the gap between the two adjacent clamping plates is maintained, which on the one hand prevents the bar from deforming due to excessive clamping, and on the other hand prevents the bar from not being clamped tightly due to the size not matching the clamping groove caused by processing tolerance.
[0011] Preferably, the clamping groove is provided in multiple ways.
[0012] By adopting the above technical solution and setting multiple clamping slots, two adjacent clamping plates can cooperate to clamp multiple bars at the same time, further improving the loading efficiency.
[0013] Preferably, an elastic element is provided between two adjacent clamping plates.
[0014] By adopting the above technical solution, the elastic element can provide a buffering force when clamping the bar, avoiding damage to the surface of the bar caused by rigid clamping, and at the same time provide a resisting force for the clamping plate. When the slider no longer clamps the clamping plate, the distance between two adjacent clamping plates along the sliding direction increases, making it easier to remove the processed bar.
[0015] Preferably, the distance between two adjacent clamping plates is 8-12mm.
[0016] By adopting the above technical solution, the 8-12mm spacing balances clamping force and space utilization, ensuring stable clamping while avoiding material waste.
[0017] Preferably, the sliding assembly further includes a sliding rod and a lead screw; the two ends of the sliding rod are respectively fixed to the limiting members at both ends of the guide rail, two sliding rods are provided and located at the same height, multiple clamping plates and sliders are slidably mounted on the sliding rods through the sliding rods, and the elastic element is sleeved on the sliding rods; the lead screw is located between the two sliding rods, the limiting member is a plate perpendicular to the guide rail, the two ends of the lead screw are respectively rotatably mounted on the limiting members at both ends of the guide rail, the lead screw passes through the limiting member, the slider and multiple clamping plates; the slider is rotatably mounted on the lead screw, and the clamping plate does not contact the lead screw; the sliding rod and the lead screw do not interfere with each other with the clamping groove.
[0018] By adopting the above technical solution, the sliding rod ensures the linear movement of the clamping plate, avoids skewness, and ensures that all clamping plates slide synchronously; the slider is driven by the lead screw to move, thereby pushing the clamping plate as a whole to move. By simply controlling the slider to slide, the clamping / releasing of multiple clamping plates can be achieved, which is convenient to operate.
[0019] Preferably, the guide rail is arranged along the width or length direction of the substrate, and the sliding assembly is provided in multiple sets and arranged along the length or width direction of the substrate. Each set of sliding assemblies has a limit member and multiple clamping plates on the guide rail.
[0020] By adopting the above technical solution, multiple sets of sliding components, with corresponding limiters and multiple clamping plates for each set of sliding components, further increase the number of bars that can be clamped and improve the loading efficiency.
[0021] Preferably, a gap is provided between two adjacent sliding components.
[0022] By adopting the above technical solution, collisions between multiple clamping plates during movement are avoided, ensuring smooth operation.
[0023] Preferably, the substrate is detachably mounted on a CNC machine tool.
[0024] By adopting the above technical solution, the base plate can be removed to clean the iron filings left on the CNC machine tool or fixture, which facilitates cleaning.
[0025] Preferably, the substrate has positioning holes, which are oblong holes; there are two positioning holes, which are located on both sides of the lead screw and are arranged along the sliding direction of the clamping plate, and the width of the positioning hole is greater than the diameter of the clamping groove; each set of sliding components has two positioning holes on both sides of the lead screw on the substrate.
[0026] By adopting the above technical solution, on the one hand, the substrate can be quickly positioned with the hands set on the CNC machine tool through the positioning hole, which facilitates installation. On the other hand, when the clamping plate is not clamped, one end of the rod is placed into the positioning hole to ensure that the rod remains upright and prevents the rod from tilting and deviating from the clamping groove during the clamping process. At the same time, the positioning hole removes redundant material, reduces the weight of the substrate, and saves production costs.
[0027] In summary, this application includes at least one of the following beneficial technical effects:
[0028] 1. By setting guide rails, sliders, limiting components and multiple clamping plates on the substrate, the sliders cooperate with the limiting components to clamp the multiple clamping plates, forming multiple clamping spaces between the multiple clamping plates. The bar is pre-placed between the multiple clamping plates. As the multiple clamping plates are clamped, the bar is also clamped. Multiple clamping spaces can clamp multiple bars at the same time, saving manual loading times and improving processing efficiency.
[0029] 2. A semi-circular clamping groove is opened on the side of the clamping plate near the other clamping plate to match the shape of the bar, thereby improving the fit and stability of the clamping; and when the two adjacent clamping plates clamp the bar, there is a gap between the two clamping plates to prevent the bar from deforming due to excessive clamping, and to prevent the bar from not being clamped tightly due to the size of the bar not matching the clamping groove due to processing tolerance.
[0030] 3. An elastic element is sleeved on the sliding rod between two adjacent clamping plates, which can provide a buffering force when clamping the bar, avoid damage to the surface of the bar caused by rigid clamping, and at the same time provide a resisting force for the clamping plate. When the slider no longer clamps the clamping plate, the distance between the two adjacent clamping plates along the sliding direction increases, making it easier to remove the processed bar. Attached Figure Description
[0031] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;
[0032] Figure 2 This is a top view of an embodiment of this application.
[0033] Reference numerals: 1. Base plate; 2. Sliding assembly; 21. Guide rail; 211. Limiting component; 212. Sliding rod; 213. Lead screw; 22. Slider; 3. Clamping plate; 31. Clamping groove; 4. Handle; 5. Positioning hole; 6. Positioning post; 7. Elastic component. Detailed Implementation
[0034] The following is in conjunction with the appendix Figure 1 -Appendix Figure 2 This application will be described in further detail.
[0035] This application discloses a clamp for holding bar stock in CNC machine tools.
[0036] refer to Figure 1 The present application provides a clamp for holding bar stock for CNC machine tools, including a base plate 1 mounted on the CNC machine tool, a sliding assembly 2 mounted on the base plate 1, and a clamping plate 3 slidably mounted on the sliding assembly 2, wherein the base plate 1 is mounted on the CNC machine tool by bolts.
[0037] refer to Figure 1 and Figure 2 The sliding component 2 includes a guide rail 21 and a slider 22. The guide rail 21 is mounted on the substrate 1 and is arranged along the length or width direction of the substrate 1. The slider 22 and the clamping plate 3 are both slidably mounted on the guide rail 21. There are multiple clamping plates 3, which are arranged in parallel and slidably mounted on the guide rail 21. There is a gap of 8-12mm between two adjacent clamping plates 3. In this embodiment, the gap is 10mm. A clamping groove 31 is provided on the side of the clamping plate 3 near the adjacent clamping plate 3. The clamping groove 31 has a semi-circular cross-sectional shape. The clamping groove 31 is used to form a clamping space for clamping the bar between two adjacent clamping plates 3. There are multiple clamping grooves 31. In this embodiment, the guide rail 21 is arranged along the width direction of the substrate 1, there are five clamping plates 3, and two clamping grooves 31 are provided on one side of the clamping plate 3, forming a total of eight clamping spaces for clamping the bar.
[0038] The guide rail 21 includes a limiting member 211, a sliding rod 212, and a lead screw 213. The limiting member 211 is a plate perpendicular to the substrate 1. Two limiting members 211 are provided and arranged parallel to each other. The two limiting members 211 are welded and fixed to both ends of the substrate 1. The sliding rod 212 passes through the two limiting members 211 at both ends and is engaged and fixed to the limiting members 211. The sliding rod 212 passes through multiple clamping plates 3 and sliders 22. The multiple clamping plates 3 and sliders 22 are slidably mounted on the guide rail 21. The multiple clamping plates 3 are arranged parallel to each other along the sliding direction of the sliders 22. The lead screw 213 has two... The end of the rod passes through two limiting members 211 and is rotatably mounted on the two limiting members 211 via bearings. The lead screw 213 also passes through multiple clamping plates 3 and slider 22. The clamping plates 3 do not contact the lead screw 213. The end of the lead screw 213 is provided with bolts. By turning the bolts at the end of the lead screw 213, the slider 22 is made to slide. The rod is placed into the clamping space, and the bolts are turned to make the slider 22 slide. The slider 22 cooperates with the limiting members 211 to clamp the multiple clamping plates 3, thereby clamping the rod. Multiple clamping spaces can clamp multiple rods at the same time, saving manual loading times and improving processing efficiency.
[0039] Multiple sets of sliding components 2 are provided, and the multiple sets of sliding components 2 are arranged along the length or width direction of the substrate 1. There is a gap between two adjacent sliding components 2 to avoid collision between the multiple sets of clamping plates 3 when they move, and to ensure smooth operation. Each set of sliding components 2 is provided with multiple clamping plates 3 and limiting members 211. In this embodiment, the multiple sets of sliding components 2 are arranged along the length direction of the substrate 1.
[0040] A handle 4 for picking up the entire clamp is welded and fixed on the limiting member 211 located on the diagonal of the base plate 1, which facilitates the installation and disassembly of the clamp.
[0041] The base plate 1 is fixed to the CNC machine tool by bolts; the base plate 1 has positioning holes 5, which are oblong holes and are arranged along the sliding direction of the clamping plate 3; there are two positioning holes 5, which are located on both sides of the lead screw 213, and the two positioning holes 5 are located between the lead screw 213 and the two sliding rods 212, respectively. The width of the positioning holes 5 is larger than the diameter of the clamping groove 31; the base plate 1 has two positioning holes 5 on both sides of the lead screw 213 corresponding to each set of sliding components 2. On the one hand, the base plate 1 is connected to the CNC machine tool through the positioning holes 5. The quick positioning of the hand parts on the bed facilitates installation. On the other hand, when the clamping plate 3 is not clamped, one end of the bar is placed into the positioning hole 5 to ensure that the bar remains upright and prevents the bar from tilting and deviating from the clamping groove 31 during the clamping process of the clamping plate 3. At the same time, the positioning hole 5 removes redundant material, reduces the weight of the base plate 1, and saves production costs. The side of the base plate 1 away from the slide rail is integrally formed with positioning posts 6. There are four positioning posts 6, which are located at the four corners of the base plate 1. The positioning posts 6 assist the base plate 1 in positioning on the CNC machine tool.
[0042] refer to Figure 2 An elastic element 7, which is a spring, is provided in the clamping space between two adjacent clamping plates 3. The elastic element 7 is sleeved on the sliding rod 212. When the two adjacent clamping plates 3 clamp the bar, the adjacent clamping plates 3 compress the elastic element 7. The spring is sleeved on the sliding rod 212 of the sliding assembly 2, which is easy to install and can function stably. When clamping the bar, the adjacent clamping plates 3 compress the spring, and the spring generates a reverse elastic force, which makes the clamping plates 3 clamp the bar more stably, and can also accommodate certain dimensional tolerances of the bar. When the slider 22 no longer clamps the clamping plates 3, the spring wants to return to its original position to provide a resisting force to the clamping plates 3, and the distance between the two adjacent clamping plates 3 along the sliding direction increases, making it easier to remove the processed bar. In other embodiments, the elastic element 7 can also be a rubber pad, which has good cushioning performance and can reduce the impact force generated when clamping the bar.
[0043] The implementation principle of this embodiment is as follows: The base plate 1 is quickly mounted on a CNC machine tool with the assistance of positioning pins 6 and positioning holes 5. Multiple clamping plates 3 and sliders 22 are mounted on guide rails 21. When it is necessary to clamp a bar, the bar is pre-placed into the positioning hole 5, and the bolts are tightened to allow the slider 22 to slide on the guide rail 21. The slider 22, in conjunction with the limiting member 211, clamps all the clamping plates 3, causing the clamping grooves 31 between adjacent clamping plates 3 to cooperate and clamp the bar. Multiple clamping spaces can simultaneously clamp multiple bars, saving manual loading times and improving processing efficiency.
[0044] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.
Claims
1. A clamp for holding bar stock in a CNC machine tool, characterized in that, The system includes a base plate (1) mounted on a CNC machine tool, a sliding assembly (2) mounted on the base plate (1), and a clamping plate (3) slidably mounted on the sliding assembly (2). The sliding assembly (2) includes a guide rail (21) and a slider (22) slidably mounted on the guide rail (21). The guide rail (21) is mounted on the base plate (1), and the clamping plate (3) is provided in multiple pieces. All clamping plates (3) are slidably mounted on the guide rail (21), and the multiple clamping plates (3) are arranged parallel to each other. The guide rail (21) is provided with limiting members (211) at both ends. When clamping a bar, the slider (22) cooperates with the limiting members (211) to clamp all the clamping plates (3).
2. The clamping fixture for holding bar stock in a CNC machine tool according to claim 1, characterized in that, The clamping plate (3) has a clamping groove (31) on one side near the adjacent clamping plate (3), and the clamping groove (31) has a semi-circular cross-section; the clamping grooves (31) of the two adjacent clamping plates (3) cooperate to clamp the bar; when the two adjacent clamping plates (3) cooperate to clamp the bar, there is a gap between the two adjacent clamping plates (3).
3. The clamping fixture for holding bar stock in a CNC machine tool according to claim 2, characterized in that, The distance between two adjacent clamping plates (3) is 8-12mm.
4. A clamping fixture for holding bar stock in a CNC machine tool according to claim 2, characterized in that, The clamping groove (31) is provided in multiple ways.
5. A clamping fixture for holding bar stock in a CNC machine tool according to claim 4, characterized in that, An elastic element (7) is provided between two adjacent clamping plates (3).
6. A clamping fixture for holding bar stock in a CNC machine tool according to claim 5, characterized in that, The sliding assembly (2) further includes a sliding rod (212) and a lead screw (213); the two ends of the sliding rod (212) are respectively fixed to the limiting members (211) at both ends of the guide rail (21), the sliding rod (212) has two rods and is located at the same height, multiple clamping plates (3) and sliders (22) are slidably mounted on the sliding rod (212) through the sliding rod (212), the elastic member (7) is sleeved on the sliding rod (212); the lead screw (213) is located between the two sliding rods (212), the The limiting member (211) is a plate perpendicular to the guide rail (21). The two ends of the lead screw (213) are respectively rotatably mounted on the limiting members (211) at both ends of the guide rail (21). The lead screw (213) passes through the limiting member (211), the slider (22) and multiple clamping plates (3). The slider (22) is rotatably mounted on the lead screw (213). The clamping plates (3) do not contact the lead screw (213). The sliding rod (212) and the lead screw (213) do not interfere with each other with the clamping groove (31).
7. A clamping fixture for holding bar stock in a CNC machine tool according to claim 6, characterized in that, The guide rail (21) is arranged along the width or length direction of the substrate (1). The sliding component (2) is provided in multiple sets and is arranged along the length or width direction of the substrate (1). Each set of sliding components (2) has a limit member (211) and multiple clamping plates (3) on the guide rail (21).
8. A clamping fixture for holding bar stock in a CNC machine tool according to claim 7, characterized in that, A gap is provided between two adjacent sliding components (2).
9. A clamping fixture for holding bar stock in a CNC machine tool according to claim 1, characterized in that, The substrate (1) can be detachably installed on a CNC machine tool.
10. A clamping fixture for holding bar stock in a CNC machine tool according to claim 3, characterized in that, The substrate (1) is provided with positioning holes (5), which are oblong holes; there are two positioning holes (5), which are located on both sides of the lead screw (213) and are arranged along the sliding direction of the clamping plate (3). The width of the positioning hole (5) is greater than the diameter of the clamping groove (31); each set of sliding components (2) has two positioning holes (5) on both sides of the lead screw (213) on the substrate (1).