A PCD cutting tool with replaceable tips

Abstract

The utility model relates to PCD cutter technical field, and disclose a PCD cutter of replaceable tool bit, including tool bit and tool bar, be equipped with locking positioning assembly between tool bit and tool bar, locking positioning assembly includes the positioning boss fixed in tool bit bottom surface, the top surface of tool bar is equipped with the positioning recess, positioning boss and positioning recess jack, the both sides symmetrical fixed connection of positioning boss have the positioning key, the tool bar is equipped with the keyway symmetry, the positioning key and keyway plug -in limit cooperation, the tool bar is equipped with the abutment groove, the positioning key is equipped with the screw hole no.

Description

Technical Field

[0001] This utility model relates to the field of PCD cutting tool technology, specifically a PCD cutting tool with a replaceable cutting head. Background Technology

[0002] PCD tools, or polycrystalline diamond tools, possess high hardness, high wear resistance, and excellent thermal conductivity. They are widely used in the precision machining of non-ferrous metals and non-metallic materials and are key machining tools in the field of modern precision manufacturing.

[0003] Most existing PCD cutting tools have a one-piece structure, with the PCD cutting edge and tool holder made by direct welding or integral molding. After long-term use, once the tool tip wears or is damaged, it cannot be disassembled and replaced separately. The entire tool must be scrapped and replaced. This not only makes the disassembly and assembly process cumbersome and time-consuming, but also prevents quick switching and maintenance of the tool tip, seriously affecting the continuity of machining and increasing production and operating costs.

[0004] Therefore, this application proposes a PCD tool with a replaceable cutting head to solve the problems mentioned above. Utility Model Content

[0005] The purpose of this invention is to provide a PCD cutting tool with a replaceable cutting head, so as to solve the problems mentioned in the background art, which are caused by the one-piece structure of existing PCD cutting tools, resulting in non-replaceable cutting heads, high usage costs, and cumbersome disassembly and assembly.

[0006] This utility model provides the following technical solution: a PCD cutting tool with a replaceable cutting head, comprising a cutting head and a cutting shank, wherein a locking and positioning assembly is provided between the cutting head and the cutting shank, the locking and positioning assembly comprising a positioning boss fixed on the bottom surface of the cutting head, a positioning groove formed on the top surface of the cutting shank, the positioning boss engaging with the positioning groove, positioning keys symmetrically fixedly connected to both sides of the positioning boss, a first threaded hole formed in the positioning key, and a second threaded hole symmetrically formed on the cutting shank, the first threaded hole and the second threaded hole being aligned, an internal hexagonal screw being threadedly connected to the second threaded hole, the hexagonal screw sequentially engaging with the first threaded hole and the second threaded hole, a keyway symmetrically formed on the cutting shank, the positioning key engaging with the keyway for limiting engagement, an abutment groove formed in the cutting shank, the abutment groove communicating with the keyway, the abutment groove and the keyway together forming an L-shaped structure.

[0007] Preferably, the corner where the keyway and the abutment groove connect is provided with a smooth, rounded transition.

[0008] Preferably, the positioning boss and the positioning groove are in clearance fit.

[0009] This utility model has the following beneficial effects:

[0010] This tool adopts a split design, with the cutter head and the tool holder being detachably connected. When the cutter head is worn or damaged, it can be replaced separately, eliminating the need to replace the entire tool, thus reducing processing costs and saving resources.

[0011] This tool allows for quick disassembly and replacement of the cutting head, and the operation steps are simple, effectively reducing the time cost required for tool replacement.

[0012] This tool achieves reliable radial centering through the cooperation of the positioning boss and the positioning groove, resulting in high positioning accuracy and good machining stability.

[0013] The cutting torque of this tool is borne by the locating key and the groove wall of the abutment groove. The force path is reasonable, and the locking component only serves to prevent loosening. The tool is stable and reliable during use.

[0014] The internal hex screw of this tool can be fully embedded inside the tool holder, with no protruding parts, avoiding interference and collisions during the machining process, thus improving safety and tool life.

[0015] The keyway and abutment groove of this tool adopt an arc transition design, the positioning key slides smoothly without jamming, and the disassembly and assembly process is more convenient and labor-saving.

[0016] This tool can be equipped with different types of tool head modules to meet different processing needs, making it highly versatile, adaptable to various processing scenarios, and improving processing efficiency.

[0017] This tool has a simple structure, is easy to manufacture, has controllable production costs, and is suitable for mass production and widespread application. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 .

[0019] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 .

[0020] Figure 3 This is an overall sectional view of the present invention.

[0021] Figure 4 For the present utility model Figure 3 Schematic diagrams of structures in different states.

[0022] Figure 5 For the present utility model Figure 4 Enlarged structural diagram at point A in the middle.

[0023] Figure 6 This is an exploded view of the entire utility model.

[0024] Figure 7 For the present utility model Figure 6Enlarged structural diagram at point B.

[0025] In the diagram: 1. Cutting head; 2. Cutting bar; 3. Locking and positioning assembly; 31. Positioning boss; 32. Positioning key; 33. Threaded hole one; 34. Positioning groove; 35. Keyway; 36. Abutment groove; 37. Threaded hole two; 38. Socket head screw. Detailed Implementation

[0026] 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.

[0027] Example: This example aims to address the problems of inconvenient tool head replacement, cumbersome disassembly and assembly, and low positioning accuracy in existing cutting tools. Please refer to [link / reference]. Figure 1 - Figure 7 A PCD cutting tool with replaceable cutting head includes a cutting head 1 and a cutting shank 2. A locking and positioning assembly 3 is provided between the cutting head 1 and the cutting shank 2. The locking and positioning assembly 3 includes a positioning boss 31 fixed on the bottom surface of the cutting head 1 and a positioning groove 34 opened on the top surface of the cutting shank 2. The positioning boss 31 and the positioning groove 34 are engaged. The positioning boss 31 and the positioning groove 34 are clearance fit, which facilitates smooth insertion during assembly and ensures radial centering accuracy.

[0028] Please see Figure 5 Positioning keys 32 are symmetrically fixedly connected to both sides of the positioning boss 31. Keyways 35 are symmetrically opened on the tool bar 2. The positioning keys 32 and keyways 35 are inserted and limited to each other. An abutment groove 36 is opened inside the tool bar 2.

[0029] Please see Figure 6 and Figure 7 The locating key 32 has a threaded hole 33, and the tool holder 2 has symmetrically arranged threaded holes 37. The threaded holes 33 and 37 are aligned. A hexagon socket screw 38 is threaded into the threaded hole 37. The hexagon socket screw 38 is sequentially locked into the threaded holes 37 and 33. After the hexagon socket screw 38 is fully screwed in, its end can be completely embedded in the tool holder 2 without protruding beyond the outer surface of the tool holder 2, avoiding interference caused by screw protrusion. At the same time, it ensures that there are no protruding parts on the outer circle of the tool, so as not to affect the clearance space between the tool and the workpiece during the machining process, and also to prevent the screw from being damaged by impact.

[0030] Please see Figure 7The abutment groove 36 is connected to the keyway 35, and the abutment groove 36 and the keyway 35 together form an L-shaped structure. The corner where the keyway 35 and the abutment groove 36 connect is set with a smooth arc transition, which facilitates the rotation and sliding of the positioning key 32 and avoids jamming and stress concentration.

[0031] In this embodiment: In the initial state, the hex socket screw 38 is in the unscrewed state, the cutter head 1 and the cutter bar 2 are separated from each other, the positioning boss 31 is not inserted into the positioning groove 34, the positioning key 32 is not entered into the keyway 35, and the cutter head 1 can be freely removed and placed.

[0032] During assembly, first align the positioning boss 31 on the bottom surface of the cutter head 1 with the positioning groove 34 on the top surface of the cutter bar 2, so that the positioning boss 31 is smoothly inserted into the positioning groove 34 along the axial direction; the positioning boss 31 and the positioning groove 34 adopt a clearance fit, which can be smoothly inserted and achieve reliable radial centering.

[0033] During insertion, the positioning keys 32 on both sides of the positioning boss 31 enter the keyway 35 on the tool holder 2. The positioning keys 32 and the keyway 35 form an insertion limiting fit and slide along the axial direction of the keyway 35 to the bottom of the groove.

[0034] After the cutter head 1 slides into position, it rotates around the axis. Because the keyway 35 and the abutment groove 36 are connected and form an L-shaped structure, the positioning key 32 stops axial movement after sliding to the bottom of the groove. As the cutter head 1 rotates, it slides from the keyway 35 into the abutment groove 36. After the positioning key 32 enters the abutment groove 36, an axial limit and a circumferential limit are formed between the cutter head 1 and the cutter bar 2. The cutter head 1 cannot be pulled out axially. The side wall of the abutment groove 36 can block the rotation of the positioning key 32, limiting the cutter head 1 from continuing to rotate circumferentially.

[0035] When the cutter head 1 rotates to the position, the positioning key 32 abuts against the wall of the abutment groove 36 and stops rotating. Due to the limiting effect of the groove structure, the threaded hole 33 on the positioning key 32 and the threaded hole 37 on the cutter bar 2 are automatically coaxially aligned. Using an external hex wrench, the internal hex screw 38 is screwed into the threaded hole 37. The internal hex screw 38 passes through the threaded hole 37 in sequence and is screwed into the threaded hole 33, realizing the threaded locking fit between the cutter head 1 and the cutter bar 2, and completing the overall assembly and fixation.

[0036] After assembly, the cutting tool can be installed on the machine tool for cutting. The cutting head 1 and the cutting shank 2 are radially centered by the positioning boss 31 and the positioning groove 34, and circumferential and axial limits are achieved by the positioning key 32, the keyway 35 and the abutment groove 36. The internal hex screw 38 only serves to lock and prevent loosening. The cutting torque is borne by the positioning key 32 and the groove wall of the abutment groove 36, ensuring a stable and reliable cutting process.

[0037] When it is necessary to disassemble and replace the cutter head 1, use a hex wrench to rotate the internal hex screw 38 in the opposite direction, so that the internal hex screw 38 is pulled out from the first threaded hole 33 and completely screwed out to the outside of the second threaded hole 37, thereby releasing the locking state between the cutter head 1 and the cutter shank 2. Then rotate the cutter head 1 circumferentially, so that the positioning key 32 rotates back into the keyway 35 along the arc transition between the keyway 35 and the abutment groove 36. Then pull the cutter head 1 upward along the axial direction of the keyway 35. The positioning boss 31 separates from the positioning groove 34, and the positioning key 32 separates from the keyway 35, thus completing the disassembly of the cutter head 1. Afterwards, a new cutter head 1 can be replaced and reassembled for use.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0039] 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 PCD cutting tool with a replaceable cutting head, comprising a cutting head (1) and a cutting shank (2), characterized in that: A locking and positioning assembly (3) is provided between the cutter head (1) and the cutter bar (2). The locking and positioning assembly (3) includes a positioning boss (31) fixed on the bottom surface of the cutter head (1). A positioning groove (34) is provided on the top surface of the cutter bar (2). The positioning boss (31) is engaged with the positioning groove (34). Positioning keys (32) are symmetrically fixedly connected on both sides of the positioning boss (31). A threaded hole (33) is provided in the positioning key (32). A threaded hole (37) is symmetrically provided on the cutter bar (2). 3) Aligned with threaded hole two (37), threaded hole two (37) is internally threaded with hexagonal screw (38), hexagonal screw (38) is sequentially threaded and locked with threaded hole two (37) and threaded hole one (33), keyways (35) are symmetrically opened on the tool bar (2), positioning key (32) is inserted and limited to keyways (35), abutment groove (36) is opened in the tool bar (2), abutment groove (36) is connected to keyway (35), abutment groove (36) and keyway (35) together form an L-shaped structure.

2. The PCD cutting tool with replaceable cutting head according to claim 1, characterized in that: The keyway (35) and the abutment groove (36) are connected at the corner with a smooth arc transition.

3. A PCD cutting tool with a replaceable cutting head according to claim 1, characterized in that: The positioning boss (31) and the positioning groove (34) are in clearance fit.

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