Fixed chuck with workpiece positioning mechanism
By introducing a workpiece positioning mechanism and an avoidance ramp design into the fixed chuck, the problems of position control and collision when clamping shaft-type workpieces with existing chucks are solved, achieving high efficiency, low cost, and high machining accuracy and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-21
- Publication Date
- 2026-03-31
AI Technical Summary
Existing fixed chucks have difficulty controlling the axial insertion position of shaft-type workpieces when clamping them, resulting in inaccurate machining positions. Furthermore, the clamping components are easily damaged by impacts, affecting machining quality and yield.
Design a fixed chuck with a workpiece positioning mechanism. By setting an adjustable positioning block in the clamping component, the workpiece is accurately positioned by using threaded connection and transmission hole. The force block and avoidance slope prevent collision and ensure that the workpiece is clamped in the preset position.
It improves the accuracy and stability of the workpiece in the processing position, reduces production costs, increases the yield rate, and avoids instability and damage to clamping components.
Smart Images
Figure CN224059276U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fixed chuck technology, and more specifically, to a fixed chuck with a workpiece positioning mechanism. Background Technology
[0002] A machining center is a highly automated, multi-functional CNC machine tool equipped with a tool magazine and an automatic tool changer. Some existing machining centers are equipped with fixed chucks. Before machining, the workpiece needs to be clamped in the fixed chuck so that the cutting tool can perform various machining operations on the workpiece. When clamping shaft-type workpieces, some existing fixed chucks require the workpiece to be loaded into the fixed chuck axially first, and then the clamping blocks of the chuck are driven by pneumatic or hydraulic means to clamp the workpiece. This method of installing the workpiece makes it difficult to control the axial position of the workpiece when it is loaded into the chuck, resulting in a large deviation between the actual machining position and the preset machining position, leading to inaccurate machining position and unqualified workpieces. In addition, some existing fixed chucks, including the clamping components, have force blocks that slide under pneumatic or hydraulic thrust. There is an internal angle (usually a right angle or approximately a right angle) between the force blocks and the clamping components. Due to machining errors, some excess material will remain at the internal angle. When the clamping components are driven to clamp, this excess material is prone to collision and damage with the base, resulting in unstable sliding of the clamping components and poor clamping effect. Utility Model Content
[0003] To address at least one of the aforementioned problems, this utility model provides a fixed chuck with a workpiece positioning mechanism, comprising: a base, on which a clamping component for clamping a workpiece is slidably disposed, a cavity is provided inside the clamping component, the cavity is disposed through the clamping component in the sliding direction, and a workpiece positioning mechanism is disposed within the cavity, the workpiece positioning mechanism including a positioning block threadedly connected to the inner wall of the cavity; before installing the workpiece, the positioning block is rotated by external force to adjust the axial position of the positioning block relative to the clamping component; when installing the workpiece, one end of the workpiece is placed into the cavity, so that one end of the workpiece abuts against the positioning block for positioning, and after positioning, the clamping component clamps the workpiece; this utility model's fixed chuck with a workpiece positioning mechanism has a simple structure and low production cost; by using the workpiece positioning mechanism to axially position the workpiece, the workpiece can be accurately positioned at a preset processing position when clamped, improving processing accuracy and yield.
[0004] Optionally, one end of the cavity is formed with an opening for inserting the workpiece, and the positioning block is placed at the end of the cavity away from the opening.
[0005] Optionally, a transmission hole is provided on the side of the positioning block away from the opening, and an external force drives the positioning block to rotate through the transmission hole.
[0006] Optionally, the positioning block is provided with an external thread, and the inner wall of the cavity is provided with an internal thread that matches the external thread.
[0007] Optionally, the positioning block includes a mounting block and a positioning post connected together, and the external thread is provided on the outside of the mounting block; when installing the workpiece, one end of the workpiece abuts against the positioning post for positioning.
[0008] Optionally, the mounting block and the positioning post are integrally formed, the mounting block is cylindrical, and the positioning post is coaxially or nearly coaxially arranged with the mounting block.
[0009] Optionally, the clamping component includes a sliding sleeve and a clamping block connected to each other. A plurality of clamping blocks are provided, and a soft rubber is provided between two adjacent clamping blocks. A first inclined surface is provided on the base body, and a second inclined surface corresponding to the first inclined surface is provided on the clamping block.
[0010] Optionally, the sliding sleeve has a protruding force-bearing block, and the base has a mounting cavity for slidingly mounting the force-bearing block. A first chamber and a second chamber are formed on both sides of the force-bearing block, and the base has a first channel communicating with the first chamber and a second channel communicating with the second chamber. When liquid or gas is introduced into the first channel, the sliding sleeve is pushed to slide in a first direction, causing the clamping block to clamp the workpiece. When liquid or gas is introduced into the second channel, the sliding sleeve is pushed to slide in a second direction, causing the clamping block to release the workpiece. The first direction is opposite to the second direction.
[0011] Optionally, the mounting cavity is provided with a first inner cavity wall and a second inner cavity wall, and the force-bearing block is provided with a first protrusion on the side near the first inner cavity wall and a second protrusion on the side near the second inner cavity wall.
[0012] Optionally, an inner angle is formed between the force-bearing block and the sliding sleeve, and the seat body is provided with a relief slope for avoiding excess material at the inner angle.
[0013] Compared to existing technologies, the fixed chuck with workpiece positioning mechanism in this invention has a simple structure and low production cost. The workpiece positioning mechanism axially positions the workpiece, ensuring it is accurately positioned at the preset processing location during clamping, thus improving processing accuracy and yield. A transmission hole is provided on the side of the positioning block away from the opening. External force drives the positioning block to rotate through the transmission hole, which is suitable for connecting to external wrenches or other compatible rotating tools. The rotating tool then drives the positioning block to rotate, adjusting its axial position for convenient operation. A first protrusion is provided on the side of the force-bearing block near the first inner cavity wall, and a second protrusion is provided on the side of the force-bearing block near the second inner cavity wall to prevent residual material at the inner corner of the sliding sleeve from colliding and damaging the seat. An inner angle is formed between the force-bearing block and the sliding sleeve, and a relief slope is provided on the seat to avoid residual material at the inner corner, further preventing collision damage and ensuring the sliding sleeve does not slide unevenly due to impact. Attached Figure Description
[0014] Figure 1 This is a cross-sectional view of the fixed chuck with workpiece positioning mechanism of this utility model;
[0015] Figure 2 for Figure 1 Enlarged view of section A in the middle;
[0016] Figure 3 for Figure 1 Enlarged view of section B;
[0017] Figure 4 This is a schematic diagram of the structure of the fixed chuck block with workpiece positioning mechanism of this utility model;
[0018] The component names corresponding to the various reference numerals in the figure are as follows: 1 for the base, 11 for the first base, 12 for the second base, 101 for the first inclined surface, 102 for the mounting cavity, 1021 for the first chamber, 1022 for the second chamber, 1023 for the first inner cavity wall, 1024 for the second inner cavity wall, 103 for the first channel, 104 for the second channel, 105 for the clearance inclined surface, 2 for the workpiece, 3 for the clamping component, and 301 for the workpiece. 302 is the cavity, 31 is the opening, 311 is the sliding sleeve, 312 is the force-bearing block, 312 is the first protrusion, 313 is the second protrusion, 32 is the clamping block, 321 is the second inclined surface, 33 is the soft rubber, 4 is the positioning block, 401 is the transmission hole, 41 is the mounting block, 42 is the positioning post, 5 is the inner angle, 61 is the dustproof ring, 62 is the first oil seal, 63 is the second oil seal, 64 is the third oil seal, 65 is the sealing ring, and 66 is the interface. Detailed Implementation
[0019] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0020] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship when the product is in normal use.
[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.
[0022] See Figures 1-4 This utility model provides a fixed chuck with a workpiece positioning mechanism, comprising: a metal base 1, a clamping component 3 for clamping a workpiece 2 slidably disposed on the base 1, a cavity 301 disposed inside the clamping component 3, the cavity 301 being disposed through the clamping component 3 along the sliding direction, and a workpiece positioning mechanism disposed within the cavity 301, the workpiece positioning mechanism including a positioning block 4 threadedly connected to the inner wall of the cavity 301; before installing the workpiece 2, the positioning block 4 is rotated by external force to adjust the axial position of the positioning block 4 relative to the clamping component 3; when installing the workpiece 2, one end of the workpiece 2 is placed... The workpiece 2 is inserted into the cavity 301, so that one end of the workpiece 2 abuts against the positioning block 4 for positioning. After positioning, the clamping component 3 clamps the workpiece 2. The fixed chuck with workpiece positioning mechanism of this utility model has a simple structure and low production cost. The workpiece is axially positioned by the workpiece positioning mechanism, so that the workpiece can be accurately located in the preset processing position when clamped, thereby improving the processing accuracy and yield. The positioning block 4 can also play an auxiliary positioning function in the axial direction of the workpiece during processing, so that the workpiece is less likely to slip downwards during processing, thereby improving the stability of processing.
[0023] See Figure 1 and Figure 4 One end of the cavity 301 has an opening 302 for loading the workpiece 2. The positioning block 4 is placed at the end of the cavity 301 away from the opening 302. By rotating and adjusting the position of the positioning block 4, the axial machining position of the workpiece 2 during machining is adjusted accordingly, thereby improving the accuracy of the machining position. The specific steps are as follows: Rotate the positioning block 4 to the required position. After the positioning block 4 is rotated, the axial distance between the upper surface of the positioning block 4 and the opening 302 can be measured using measuring tools such as a depth gauge. If the distance measured by the depth gauge does not meet the workpiece positioning requirements, the positioning block 4 is rotated for fine adjustment. If the distance measured by the depth gauge meets the workpiece positioning requirements, the positioning block 4 has completed the position adjustment. When loading the workpiece after the positioning block 4 has been adjusted, the workpiece 2 is loaded into the cavity 301 from the opening 302 until one end of the workpiece 2 abuts against the positioning block 4 for positioning. At this time, the workpiece 2 is located in the preset machining position, thereby improving the accuracy of the machining position.
[0024] See Figure 1 and Figure 4 The positioning block 4 has a transmission hole 401 on the side away from the opening 302. External force drives the positioning block 4 to rotate through the transmission hole 401. The transmission hole 401 is suitable for connecting with a rotating tool such as an external wrench, and the rotating tool drives the positioning block 4 to rotate, thereby adjusting the axial position of the positioning block 4. The operation is convenient. In this embodiment, the transmission hole 401 is set as an internal hexagon blind hole. The positioning block 4 is provided with an external thread, and the inner wall of the cavity 301 is provided with an internal thread that matches the external thread. The structure is simple and the production cost is low. The axial position of the positioning block 4 is adjusted by rotating the positioning block 4. After adjustment, the positioning block 4 self-positions through the thread engagement, which is convenient for adjustment.
[0025] See Figure 1 The positioning block 4 includes a mounting block 41 and a positioning post 42 connected to each other, with an external thread on the outside of the mounting block 41. When installing the workpiece 2, one end of the workpiece 2 abuts against the positioning post 42 for positioning. The mounting block 41 and the positioning post 42 are integrally formed, resulting in low manufacturing cost. The mounting block 41 is cylindrical, and the positioning post 42 is coaxially or nearly coaxially arranged with the mounting block 41, so that the positioning post 42 can abut against the center part of the lower end of the shaft workpiece, making it less likely for the workpiece to tilt after positioning and making the processing more stable.
[0026] See Figure 1 and Figure 3 The clamping component 3 includes a sliding sleeve 31 and a clamping block 32 connected to each other. Several clamping blocks 32 are provided. In this embodiment, three clamping blocks 32 are provided. A soft rubber 33 is provided between two adjacent clamping blocks 32. The soft rubber 33 is made of rubber or silicone. A first inclined surface 101 is provided on the base 1. A second inclined surface 321 corresponding to the first inclined surface 101 is provided on the clamping block 32. When the clamping component 3 slides downward relative to the base 1, the clamping block 32 is squeezed inward by the first inclined surface 101, and the clamping block slides inward to clamp the workpiece. When the clamping component 3 slides upward relative to the base 1, the clamping block slides outward to release the workpiece under the elastic force of the soft rubber 33.
[0027] See Figure 1 and Figure 2A force-bearing block 311 is protruding outwardly on the sliding sleeve 31. A mounting cavity 102 for slidingly mounting the force-bearing block 311 is provided on the base 1. A first chamber 1021 and a second chamber 1022 are formed on both sides of the force-bearing block 311. A first channel 103 communicating with the first chamber 1021 and a second channel 104 communicating with the second chamber 1022 are provided on the base 1. When liquid or gas is introduced into the first channel 103, it pushes the sliding sleeve 31 to slide in a first direction, causing the clamping block 32 to clamp the workpiece 2. When liquid or gas is introduced into the second channel 104, it pushes the sliding sleeve 31 to slide in a second direction, causing the clamping block 32 to release the workpiece 2. The first direction is downward, and the second direction is upward, which is opposite to the second direction. A dustproof ring 61, a first oil seal 62, a second oil seal 63, a third oil seal 64, and a sealing ring 65 are provided between the seat body 1 and the sliding sleeve 31 to prevent liquid or gas leakage and ensure reliable use. The seat body 1 is provided with multiple interfaces 66 for connecting high-pressure liquid or high-pressure gas. The appropriate interface 66 can be selected according to the requirements to connect to high-pressure liquid or high-pressure gas, which is flexible in use. The unselected interface is sealed. The seat body 1 includes a first seat body 11 and a second seat body 12. The first seat body 11 and the second seat body 12 can be fixed by bolts. The seat body 1 is designed in two parts to reduce manufacturing difficulty.
[0028] See Figure 1 and Figure 2 The mounting cavity 102 is provided with a first inner cavity wall 1023 and a second inner cavity wall 1024. The force-bearing block 311 is provided with a first protrusion 312 on the side near the first inner cavity wall 1023 and a second protrusion 313 on the side near the second inner cavity wall 1024, so as to prevent the residual material at the inner corner 5 of the sliding sleeve 31 from colliding and being damaged with the seat body 1. An inner corner 5 is formed between the force-bearing block 311 and the sliding sleeve 31. The seat body 1 is provided with a relief slope 105 for avoiding the residual material at the inner corner 5, so as to further prevent the residual material at the inner corner 5 from colliding and being damaged with the seat body 1, and to avoid the problem of the sliding sleeve 31 sliding unevenly due to collision.
[0029] The fixed chuck with workpiece positioning mechanism of this utility model has a simple structure and low production cost. The workpiece is axially positioned by the workpiece positioning mechanism, so that the workpiece can be accurately located in the preset processing position when clamped, which improves the processing accuracy and yield. A transmission hole is provided on the side of the positioning block away from the opening. External force drives the positioning block to rotate through the transmission hole. The transmission hole is suitable for connecting with external wrenches or other compatible rotary tools, and the axial position of the positioning block is adjusted by rotating the positioning block through the rotary tool, which is convenient to operate. A first protrusion is provided on the side of the force-bearing block near the first inner cavity wall, and a second protrusion is provided on the side of the force-bearing block near the second inner cavity wall, so as to prevent the residual material at the inner corner of the sliding sleeve from colliding and being damaged by the seat. An inner angle is formed between the force-bearing block and the sliding sleeve. The seat is provided with a relief slope to avoid the residual material at the inner corner from colliding and being damaged by the residual material at the inner corner, so as to avoid the problem of unstable sliding of the sliding sleeve due to collision.
[0030] In the description of this disclosure, it should be understood that the terms "upper", "lower", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.
[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A fixed collet with workpiece positioning mechanism, characterized by, The utility model provides a workpiece positioning mechanism of workpiece clamping device, including: The body (1), the clamping part (3) for clamping work piece (2) is arranged on the body (1) and slides, the clamping part (3) inside is provided with the accommodating cavity (301), the accommodating cavity (301) is provided with along the clamping part (3) sliding direction through arrangement, the work piece positioning mechanism is arranged in the accommodating cavity (301), and the work piece positioning mechanism includes the locating block (4) threaded connection in the accommodating cavity (301) inner wall, before installing the work piece (2), external force rotates the locating block (4), to adjust the axial position of the locating block (4) relative to the clamping part (3), when installing the work piece (2), the work piece (2) one end is placed in the accommodating cavity (301), so that the work piece (2) one end is positioned on the locating block (4) and is positioned, and the clamping part (3) clamps the work piece (2) after positioning.
2. The fixed collet with workpiece positioning mechanism of claim 1, wherein, The one end of the accommodating cavity (301) is formed with the opening (302) for loading the work piece (2), and the locating block (4) is placed at the one end of the accommodating cavity (301) away from the opening (302).
3. The fixed collet with workpiece positioning mechanism of claim 2, wherein, The side of the locating block (4) away from the opening (302) is provided with a transmission hole (401), and external force drives the locating block (4) to rotate through the transmission hole (401).
4. The fixed collet with workpiece positioning mechanism of claim 1, wherein, The locating block (4) is provided with an external thread, and the inner wall of the accommodating cavity (301) is provided with an internal thread matched with the external thread.
5. The fixed collet with workpiece positioning mechanism of claim 4, wherein, The locating block (4) includes an installation block (41) and a positioning column (42) connected, and the external thread is arranged on the outer side of the installation block (41), when the work piece (2) is installed, the work piece (2) one end is positioned on the positioning column (42).
6. The fixed collet with workpiece positioning mechanism of claim 5, wherein, The installation block (41) and the positioning column (42) are integrally formed, the installation block (41) is cylindrical, and the positioning column (42) is coaxially arranged with the installation block (41) or nearly coaxially arranged.
7. The fixed collet with workpiece positioning mechanism of claim 1, wherein, The clamping part (3) includes a sliding sleeve (31) and a clamping block (32) connected, the clamping block (32) is provided with a plurality of soft rubber (33) between adjacent two clamping blocks (32), the body (1) is provided with a first inclined surface (101), and the clamping block (32) is provided with a second inclined surface (321) corresponding to the first inclined surface (101).
8. The fixed collet with workpiece positioning mechanism of claim 7, wherein, The force block (311) is arranged on the slide sleeve (31) in an outward convex manner, the seat body (1) is provided with a mounting cavity (102) for slidingly mounting the force block (311), two sides of the force block (311) are respectively formed with a first cavity (1021) and a second cavity (1022), the seat body (1) is provided with a first channel (103) in communication with the first cavity (1021) and a second channel (104) in communication with the second cavity (1022); when the first channel (103) is communicated with liquid or gas, the slide sleeve (31) is pushed to slide in a first direction, so that the clamping block (32) clamps the workpiece (2); when the second channel (104) is communicated with liquid or gas, the slide sleeve (31) is pushed to slide in a second direction, so that the clamping block (32) releases the workpiece (2), and the first direction is opposite to the second direction.
9. The fixed collet with workpiece positioning mechanism of claim 8, wherein, The mounting cavity (102) is provided with a first inner cavity wall (1023) and a second inner cavity wall (1024), a first protrusion (312) is arranged on one side of the force block (311) close to the first inner cavity wall (1023), and a second protrusion (313) is arranged on one side of the force block (311) close to the second inner cavity wall (1024).
10. The fixed collet with workpiece positioning mechanism of claim 8, wherein, An inner angle (5) is formed between the force block (311) and the slide sleeve (31), and the seat body (1) is provided with a clearance slope (105) for avoiding excess material at the inner angle (5).