Zero-point positioning quick-change tool bar

Abstract

The utility model belongs to the tool installation field, concretely relates to a zero point positioning quick change tool bar, it includes the pole body, the end of pole body is equipped with zero point positioning surface and the zero point positioning axle of convex zero point positioning surface, is equipped with the axial locking wire hole that surrounds the zero point positioning axle and is evenly distributed in a circle on zero point positioning surface, the zero point positioning axle is used for being arranged in the central hole of reamer cutter head, the adjusting hole with the taper hole section is equipped in the zero point positioning axle, installs the taper expansion piece and locking screw in the adjusting hole, the taper expansion piece is adapted with taper hole section and can move along the axial direction of pole body, is used for extruding zero point positioning axle along the radial direction of tool body to eliminate the clearance of zero point positioning axle and central hole, locking screw passes through the taper expansion piece, and is connected with pole body threadedly to extrude the taper expansion piece in pole body. The utility model can realize the quick positioning assembly of reamer cutter head on the tool bar, and the operation is simple, and the positioning is accurate.

Description

Technical Field

[0001] This utility model belongs to the field of tool installation, specifically relating to a zero-point positioning quick-change tool holder. Background Technology

[0002] In the field of machining, the positioning and installation accuracy of the reamer head and tool holder directly affects the dimensional accuracy and surface quality of the machined workpiece, and its assembly structure design is the key to ensuring machining stability.

[0003] In existing technologies, reamer heads are typically welded and assembled with the tool holder. Positioning and fixation to the tool holder are achieved through a flange shank boss structure at the end of the tool holder furthest from the reamer head. During installation, radial position calibration is performed using radial adjusting screws on the flange, and end-face fit adjustment is performed using end-face adjusting screws. This ensures the radial runout accuracy and end-face perpendicularity of the reamer head during high-speed rotation, preventing machining errors caused by assembly deviations.

[0004] However, this positioning and installation method has significant drawbacks: firstly, its adjustment structure involves multiple sets of radial and end-face adjustment screws, requiring repeated adjustments to achieve the required accuracy, resulting in a complex assembly process and cumbersome operation; secondly, each time the reamer head is assembled or replaced, the entire tool holder needs to be disassembled and the radial and end-face calibrations need to be re-performed, which is time-consuming and seriously affects production efficiency. Furthermore, during multiple adjustments, variations in human operation can easily lead to unstable positioning accuracy, making it difficult to guarantee machining consistency. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a zero-point positioning quick-change tool holder to solve the technical problems of cumbersome operation and difficulty in ensuring positioning accuracy during the installation of existing reamer cutter heads.

[0006] To solve the above problems, the present invention provides a zero-point positioning quick-change tool holder with the following technical solution: A zero-point positioning quick-change tool holder includes a rod body. The end of the rod body has a zero-point positioning surface and a zero-point positioning shaft protruding from the zero-point positioning surface. The rod body has axial locking screw holes evenly distributed circumferentially around the zero-point positioning shaft. The zero-point positioning shaft is inserted into the center hole of a reamer disc. The zero-point positioning shaft has an adjustment hole with a tapered section. A tapered tensioning block and a locking screw are installed in the adjustment hole. The tapered tensioning block is adapted to the tapered section and can move axially along the rod body, used to radially compress the zero-point positioning shaft to eliminate the gap between the zero-point positioning shaft and the center hole. The locking screw passes through the tapered tensioning block and is threadedly connected to the rod body to press the tapered tensioning block tightly within the rod body. The beneficial effects of this utility model are as follows: This utility model enables the separate and rapid positioning and assembly of the reamer disc and the tool holder. After the tool holder and tool shank are pre-positioned and connected, the tool holder does not need to be disassembled during subsequent operations. The reamer disc to be installed is simply placed on the zero-point positioning shaft and abutted against the zero-point positioning surface. A fixing screw is inserted through the axial locking screw hole to pre-assemble the reamer disc and the tool body. Then, the locking screw is tightened to move the tapered tensioning block axially, thereby tightening the zero-point positioning shaft and eliminating the gap between the zero-point positioning shaft and the center hole of the reamer disc. Finally, the fixing screw is tightened to achieve precise positioning of the reamer disc. When the reamer disc needs to be replaced, simply loosen the locking screw and remove the corresponding fixing screw to remove the old reamer disc. The new reamer disc can then be quickly positioned and installed in the same manner. This utility model achieves rapid and precise positioning and assembly of the reamer disc, making operation simpler, positioning more accurate, and ensuring machining consistency.

[0007] Furthermore, the tapered tensioning block is provided with a stepped hole, which includes a large-diameter hole section and a small-diameter hole section arranged coaxially. The locking screw includes a screw head and a threaded column section connected coaxially. The threaded column section passes through the small-diameter hole section and is threadedly connected to the rod body. The screw head is located in the large-diameter hole section and is pressed against the bottom wall of the large-diameter hole section.

[0008] Beneficial effect: The screw head is built into the conical tensioning block and does not protrude from the surface of the conical tensioning block, thus avoiding interference with the assembly of the reamer disc.

[0009] Furthermore, the conical tensioning block includes a coaxial conical tensioning part and a cylindrical guide part. The conical tensioning part has a conical tensioning surface adapted to the conical hole section. The large-diameter hole section is located inside the conical tensioning part. The small-diameter hole section is located inside the cylindrical guide part. The outer diameter of the cylindrical guide part is equal to the minimum outer diameter of the conical tensioning part.

[0010] Beneficial effects: The tapered tensioning surface of the tapered tensioning part is precisely matched with the tapered hole section of the adjusting hole, ensuring that the radial force is evenly transmitted during tensioning, completely eliminating the gap between the zero-point positioning shaft and the center hole of the reamer disc, and improving positioning accuracy; the cylindrical guide part makes it easy to insert the tapered tensioning block into the adjusting hole, improving the convenience of operation.

[0011] Furthermore, the screw head is provided with a tool interface.

[0012] Beneficial effects: It facilitates the use of tools, such as wrenches, to quickly tighten the locking screws, thereby enabling the rapid locking and unlocking of the tapered tensioning block. This facilitates the rapid assembly and disassembly of the subsequent reamer disc, further shortening assembly and replacement time.

[0013] Furthermore, the tapered bore section extends to the end of the zero-point positioning shaft.

[0014] Beneficial effects: Ensures that the gap between the zero-point positioning shaft and the center hole of the reamer head is completely eliminated from the root to the end, further improving positioning accuracy and connection stability.

[0015] Furthermore, the axial length of the adjustment hole is greater than the axial length of the zero-point positioning shaft.

[0016] Beneficial effects: It provides greater axial movement space for the conical tensioning block, ensuring that the tensioning block has sufficient stroke to fully compress the zero-point positioning shaft and completely eliminate gaps; at the same time, it avoids the tensioning block from failing to tighten effectively due to the limitation of the positioning shaft length, ensuring the reliability of the tensioning mechanism.

[0017] Furthermore, the end of the rod away from the zero-point positioning axis is provided with a connecting flange and a flange boss protruding from the connecting flange. The flange boss is used to be coaxially inserted with the inner hole of the tool holder. The connecting flange is provided with multiple axial fixing holes evenly distributed around the circumference of the flange boss. The axis of the axial fixing holes is parallel to the axis of the axial locking screw hole.

[0018] Beneficial effect: Facilitates the positioning and assembly of the rod and the tool holder.

[0019] Furthermore, the end of the rod near the zero-point positioning axis is provided with multiple positioning bosses that are evenly distributed around the circumference of the zero-point positioning axis, and the end faces of the multiple positioning bosses are coplanar to form the zero-point positioning surface.

[0020] Beneficial effects: The positioning boss can axially stop and position the reamer head, and the setting of the positioning boss can reduce the overall contact area between the zero-point positioning surface and the reamer head, reduce the flatness requirements during machining, and facilitate manufacturing.

[0021] Furthermore, the positioning boss extends radially along the rod to the outer circumferential surface of the rod. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the zero-point positioning quick-change tool holder of this utility model; Figure 2 for Figure 1 The main view; Figure 3 for Figure 2 AA section view; Figure 4 This is a sectional view of the rod. Figure 5 This is a cross-sectional view of the tapered tensioning block; Figure 6 This is a schematic diagram showing the fit between the locking screw and the tapered tensioning block. Figure 7 A schematic diagram of the reamer disc assembled with the zero-point positioning quick-change tool holder of this utility model; Figure 8 This is a schematic diagram of the assembly between the zero-point positioning quick-change tool holder and the reamer head of this utility model.

[0023] Explanation of reference numerals in the attached figures: 1. Rod body; 11. Zero-point positioning surface; 12. Positioning boss; 13. Connecting flange; 14. Flange boss; 15. Axial locking screw hole; 16. Axial fixing hole; 2. Conical tensioning block; 21. Conical tensioning part; 22. Cylindrical guide part; 23. Large diameter hole section; 24. Small diameter hole section; 3. Locking screw; 31. Screw head; 32. Threaded column section; 33. Tool interface; 4. Zero-point positioning shaft; 41. Adjustment hole; 411. Conical hole section; 412. Receiving hole section; 5. Reamer disc; 51. Center hole; 52. Screw through hole; 6. Tool holder; 7. Axial screw. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0026] An embodiment of the zero-point positioning quick-change tool holder provided by this utility model: like Figure 1 and Figure 2 As shown, the zero-point positioning quick-change tool holder includes a rod body 1, a zero-point positioning shaft 4 integrally formed with the rod body 1, a tapered tensioning block 2 and a locking screw 3 disposed inside the rod body 1.

[0027] Zero-point positioning quick-change tool holder is used for positioning and assembling the reamer head 5. The structure of the reamer head 5 is as follows: Figure 7 As shown, a central hole 51 is provided in the center of the reamer disc 5, and multiple screw through holes 52 are evenly provided around the central hole 51 in the circumferential direction on the reamer disc 5.

[0028] In this embodiment, as Figure 1 As shown, one end of the rod body 1 near the zero-point positioning shaft 4 is provided with a plurality of positioning bosses 12 evenly distributed around the circumference of the zero-point positioning shaft 4, and the plurality of positioning bosses 12 extend radially along the rod body 1 to the outer circumferential surface of the rod body 1. Figure 2As shown, the end faces of each positioning boss 12 are coplanar to form a zero-point positioning surface 11, and the zero-point positioning shaft 4 protrudes from the zero-point positioning surface 11. The zero-point positioning surface 11 is used to stop and contact the reamer disc 5 to position the axial position of the reamer disc 5. The zero-point positioning surface 11 positions the reamer disc 5 in the same position each time it is installed.

[0029] like Figure 4 As shown, the end of the rod body 1 furthest from the tool holder 6 is provided with a plurality of axial locking screw holes 15 evenly distributed in a circle around the zero-point positioning shaft 4. The axial locking screw holes 15 correspond one-to-one with the screw through holes 52 on the reamer disc 5. The zero-point positioning shaft 4 is used to pass through the center hole 51 of the reamer disc 5 and is assembled with the reamer disc 5 through the shaft hole.

[0030] like Figure 4 As shown, the zero-point positioning shaft 4 is coaxial with the rod body 1 and has an adjustment hole 41 inside. The adjustment hole 41 includes a tapered hole section 411 and a receiving hole section 412. The tapered hole section 411 is located on the outer side and one end extends along the axial direction of the rod body 1 to the end of the zero-point positioning shaft 4. The receiving hole section 412 is located on the inner side and the end of the receiving hole section 412 away from the tapered hole section 411 extends into the rod body 1, so that the axial length of the entire adjustment hole 41 is greater than the length of the zero-point positioning shaft 4.

[0031] like Figure 5 As shown, the conical tensioning block 2 includes a coaxial conical tensioning portion 21 and a cylindrical guide portion 22. The conical tensioning portion 21 has a conical tensioning surface adapted to the conical hole section 411, and the outer diameter of the cylindrical guide portion 22 is equal to the minimum outer diameter of the conical tensioning portion 21. The conical tensioning block 2 has a stepped hole, which includes a large-diameter hole section 23 and a small-diameter hole section 24 arranged coaxially. The large-diameter hole section 23 is located inside the conical tensioning portion 21, and the small-diameter hole section 24 is located inside the cylindrical guide portion 22.

[0032] like Figure 6 As shown, the locking screw 3 includes a screw head 31 and a threaded post section 32 coaxially connected together. The threaded post section 32 passes through the small-diameter hole section 24 and is threadedly connected to the rod body 1. The screw head 31 is located inside the large-diameter hole section 23. The screw head 31 is provided with a tool interface 33, which can be connected to tools such as wrenches, allowing the operator to easily tighten the locking screw 3 by hand. After the locking screw 3 is fixed, the screw head 31 presses against the bottom wall of the hole in the large-diameter hole section 23, thereby locking the tapered tensioning block 2 inside the rod body 1. Figure 3 and Figure 8 As shown, the conical tensioning block 2 can move along the axial direction of the rod 1 in the adjusting hole 41 under the top pressure of the locking screw 3. During the movement, the conical tensioning part 21 squeezes the inner wall of the conical hole section 411 along the radial direction of the rod 1, thereby causing the zero-point positioning shaft 4 to support the reamer disc 5 along its radial direction, eliminating the gap between the zero-point positioning shaft 4 and the center hole 51 of the reamer disc 5.

[0033] like Figure 4 As shown, the end of the rod body 1 furthest from the zero-point positioning shaft 4 is provided with a connecting flange 13 and a flange boss 14 protruding from the connecting flange 13. The flange boss 14 is used for coaxial insertion with the inner hole of the tool holder 6. The connecting flange 13 is provided with a plurality of axial fixing holes 16 evenly distributed around the circumference of the flange boss 14. The axis of the axial fixing holes 16 is parallel to the axis of the axial locking screw hole 15. The axial fixing holes 16 are used to install end face set screws to achieve fixation with the tool holder 6.

[0034] The positioning and assembly process of the zero-point positioning quick-change tool holder and the reamer head 5 of this utility model is as follows: like Figure 8 As shown, before installing the reamer cutter head 5, the tapered tensioning block 2 is first assembled into the adjustment hole 41 of the zero-point positioning shaft 4 to achieve a pre-tightened state; the entire rod body 1 is coaxially inserted with the tool holder 6 through the flange boss 14 at the end, and end face set screws are inserted into each axial fixing hole 16 on the connecting flange 13 to connect and lock it with the corresponding flange on the tool holder 6. By adjusting the set screws on the flange end face and radial position on the tool holder 6, the outer diameter runout error of the zero-point positioning shaft 4 is ensured to be within 0.003mm, and the perpendicularity error of the end of the zero-point positioning shaft 4 is within 0.003mm. At this time, the installation of the zero-point positioning quick-change tool holder is ensured. When installing the reamer cutter head 5 later, the position of the zero-point positioning quick-change tool holder does not move and is not disassembled.

[0035] When assembling the reamer disc 5, first adjust the tapered tensioning block 2 to the untightened state, then place the center hole 51 of the reamer disc 5 onto the zero-point positioning shaft 4 and move it to the position where it stops with the zero-point positioning surface 11. At the same time, align the screw through hole 52 on the reamer disc 5 with the axial locking screw hole 15 on the rod body 1. Use the axial screw 7 to pre-assemble the reamer disc 5 and the rod body 1. Then, use a tool wrench to tighten the locking screw 3. The locking screw 3 presses against the tapered tensioning block 2 and moves axially. The tapered tensioning block 2 radially expands the zero-point positioning shaft 4, thereby eliminating the gap between the zero-point positioning shaft 4 and the center hole 51 of the reamer disc 5. Loosen the tool wrench so that the locking screw 3 locks the tapered tensioning block 2. Then, tighten all the axial screws to achieve rapid positioning and assembly of the reamer disc 5 and the zero-point positioning quick-change tool holder.

[0036] After prolonged use, once the reamer head 5 has reached its machining life, unscrew the locking screw 3 in the opposite direction to release the tension of the tapered tensioning block 2. Then, remove all axial screws to remove the reamer head 5 from the zero-point positioning quick-change tool holder. There is no need to disassemble the zero-point positioning quick-change tool holder 6. When replacing the reamer head 5, follow the same steps.

[0037] This invention utilizes a structural design where the zero-point positioning shaft 4 passes through the central hole 51 of the reamer disc 5 and radially compresses the conical tensioning block 2 to eliminate gaps. This design replaces the existing assembly method where the reamer disc 5 is welded to the tool holder and then repeatedly adjusted using multiple sets of radial and end-face set screws. This significantly simplifies the assembly process. When replacing the reamer disc 5, it is not necessary to disassemble the entire zero-point positioning quick-change tool holder; only the conical tensioning block 2 needs to be loosened. This shortens replacement time and improves production efficiency. By precisely eliminating the shaft-hole gaps, positioning accuracy is ensured, reducing instability in accuracy caused by human error and improving machining consistency.

[0038] In other embodiments, the tapered tensioning block is provided with a through hole of equal diameter for the locking screw to pass through. In this case, the screw head of the locking screw is located on the outside of the tapered tensioning block and is pressed against the end face of the tapered tensioning block. However, the screw head is still located entirely within the zero-point positioning shaft and will not interfere with the machining of the reamer.

[0039] In other embodiments, the tapered tensioning block may only have a tapered tensioning portion without a cylindrical guide portion.

[0040] In other embodiments, the positioning boss may not extend radially to the outer periphery of the rod, in which case the outer periphery of the positioning boss is at a certain distance from the outer periphery of the rod.

[0041] In the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

[0042] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A zero point positioning quick-change tool bar comprising a bar body, characterized in that, The end of the rod is provided with a zero-point positioning surface and a zero-point positioning shaft protruding from the zero-point positioning surface. The rod is provided with axial locking screw holes evenly distributed around the zero-point positioning shaft in a circular pattern. The zero-point positioning shaft is used to pass through the center hole of the reamer disc. The zero-point positioning shaft is provided with an adjustment hole with a tapered section. A tapered tensioning block and a locking screw are installed in the adjustment hole. The tapered tensioning block is adapted to the tapered section and can move along the axial direction of the rod. It is used to compress the zero-point positioning shaft radially along the cutter body to eliminate the gap between the zero-point positioning shaft and the center hole. The locking screw passes through the tapered tensioning block and is threaded to the rod body to press the tapered tensioning block into the rod body.

2. The quick-change tool holder according to claim 1, wherein, The conical tensioning block has a stepped hole, which includes a large-diameter hole section and a small-diameter hole section arranged coaxially. The locking screw includes a screw head and a threaded column section connected coaxially. The threaded column section passes through the small-diameter hole section and is threadedly connected to the rod body. The screw head is located in the large-diameter hole section and is pressed against the bottom wall of the hole in the large-diameter hole section.

3. The zero-point positioning quick-change tool holder according to claim 2, characterized in that, The conical tensioning block includes a coaxial conical tensioning part and a cylindrical guide part. The conical tensioning part has a conical tensioning surface adapted to the conical hole section. The large-diameter hole section is located inside the conical tensioning part. The small-diameter hole section is located inside the cylindrical guide part. The outer diameter of the cylindrical guide part is equal to the minimum outer diameter of the conical tensioning part.

4. A zero point positioning quick-change tool holder according to claim 2 or 3, characterized in that, The screw head is provided with a tool interface.

5. A zero-point positioning quick-change tool holder according to claim 3, characterized in that, The tapered bore section extends to the end of the zero-point positioning shaft.

6. The quick-change tool holder of claim 1, wherein, The axial length of the adjustment hole is greater than the axial length of the zero-point positioning shaft.

7. The quick-change tool spindle of any one of claims 1-3, wherein: The end of the rod away from the zero-point positioning axis is provided with a connecting flange and a flange boss protruding from the connecting flange. The flange boss is used to be coaxially inserted with the inner hole of the tool holder. The connecting flange is provided with multiple axial fixing holes evenly distributed around the circumference of the flange boss. The axis of the axial fixing holes is parallel to the axis of the axial locking screw hole.

8. The quick-change tool spindle of any one of claims 1-3, wherein: The rod body has multiple positioning bosses evenly distributed around the circumference of the zero-point positioning axis at one end. The end faces of the multiple positioning bosses are coplanar to form the zero-point positioning surface.

9. The quick-change tool holder according to claim 8, wherein, The positioning boss extends radially to the outer circumferential surface of the rod.

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