An apparatus and method for processing annular pre-fragmented microgrooves

Abstract

This invention discloses an apparatus and method for processing microgrooves in annular pre-fragmented parts. The apparatus includes a combined broach and a positioning assembly. The combined broach includes a central shaft and an annular tool holder. The outer circumference of the annular tool holder has m axial mounting grooves. A cutting blade and a clamping block for clamping the cutting blade are installed in each axial mounting groove. The positioning assembly includes a limiting sleeve, a bushing, a clamping ring, and a tool-setting ring. The tool-setting ring has m tool-setting grooves. A cylindrical pin is provided between the tool-setting ring and the clamping ring. The clamping ring has multiple pin holes for installing the cylindrical pin. This invention utilizes the positioning assembly to fix multiple stacked annular pre-fragmented part blanks on a broaching machine table. The combined broach simultaneously broaches and processes multiple microgrooves on these annular pre-fragmented part blanks. This apparatus offers high processing efficiency for processing microgrooves in annular pre-fragmented parts, enabling rapid and mass production of annular pre-fragmented parts.

Description

Technical Field

[0001] This invention belongs to the field of annular pre-fragmented material processing technology, specifically relating to an apparatus and method for processing annular pre-fragmented microgrooves. Background Art

[0002] Annular pre-fragmented components are lethal components used in munitions such as landmines and grenades. They utilize their high density and high strength characteristics to form high-speed fragments upon explosion to kill the target. Typically, annular pre-formed fragments have microgrooves pre-fabricated (groove depth 2mm, groove width ≤0.5mm). Currently, the processing method for microgrooves is as follows: first, a blank is produced using powder metallurgy injection molding or compression molding; then, through debinding, sintering, heat treatment, and subsequent processing such as turning and grinding, annular or tubular tungsten alloy semi-finished products without microgrooves are produced; then, microgrooves are processed using laser cutting or water jet cutting. However, because laser cutting easily causes alloy erosion at the laser contact point, it is difficult or even impossible to effectively cut microgrooves with a width less than 0.5mm. Water jet cutting is also limited by current water jet technology, making it difficult or even impossible to effectively cut microgrooves with a width less than 0.5mm. While wire cutting can make the microgrooves uniform in both width and depth, the processing speed is very slow, making it difficult to meet the requirements of rapid and large-scale production. Therefore, a device and method for processing microgrooves in annular pre-formed fragments should be provided. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an apparatus and method for processing microgrooves in annular pre-fragmented pieces, which addresses the shortcomings of the prior art. The apparatus has a simple structure and reasonable design. By using a positioning component, multiple stacked annular pre-fragmented piece blanks can be fixed on the broaching machine worktable. Multiple microgrooves are simultaneously broached on the multiple annular pre-fragmented piece blanks using a combined broaching tool. The processing efficiency of microgrooves in annular pre-fragmented pieces using this apparatus is high, which can meet the requirements of rapid and mass production of annular pre-fragmented pieces. Moreover, the processing cost is low, making it easy to promote and apply.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a device for processing annular pre-fragmented microgrooves, characterized in that: it includes a combined broach for broaching multiple microgrooves at one time and a positioning assembly set on the broaching machine worktable for stacking multiple annular pre-fragmented blanks, the combined broach including a central shaft and an annular tool holder coaxially mounted on the central shaft, the outer circumferential surface of the annular tool holder having m axial mounting grooves arranged at equal intervals along the circumferential direction, where m is a positive integer, the axial mounting... A blade and a clamping block for pressing the blade are installed in the groove. Both ends of the annular tool holder are provided with limiting rings for limiting the axial position of multiple blades. The positioning assembly includes a limiting sleeve installed on the broaching machine worktable, a bushing coaxially installed in the limiting sleeve, a clamping ring installed on the top of the limiting sleeve, and a tool setting ring installed on the clamping ring. The tool setting ring has m tool setting grooves. A cylindrical pin is provided between the tool setting ring and the clamping ring. The clamping ring has multiple pin holes for installing the cylindrical pin.

[0005] The above-mentioned device for processing annular pre-fragmented microgrooves is characterized in that: the blade is provided with N cutting teeth, the height difference t between two adjacent cutting teeth satisfies t=h / N, where h is the groove depth of the annular pre-fragmented microgroove, h and N are both positive integers, and the thickness of the cutting teeth is equal to the groove width of the microgroove.

[0006] The above-mentioned device for processing annular pre-fragmented micro-grooves is characterized in that: the central shaft includes an annular tool holder mounting section, a top connecting section and a bottom connecting section coaxially disposed at both ends of the annular tool holder mounting section, and the top end of the top connecting section and the bottom end of the bottom connecting section are each provided with a connector for connecting to a broaching clamp.

[0007] The above-mentioned device for processing annular pre-fragmented microgrooves is characterized in that: the number of annular cutter holders is three, the three annular cutter holders are coaxially mounted on the annular cutter holder mounting section, and the cutting depth of the three blades located on the same plane is equal to the groove depth of the microgroove.

[0008] The above-mentioned device for processing annular pre-fragmented micro-grooves is characterized in that: the annular cutter holder mounting section is connected to the annular cutter holder by a flat key, and the annular cutter holder mounting section is fitted with a first shaft end retaining ring located at the top of the annular cutter holder and a second shaft end retaining ring located at the bottom of the annular cutter holder.

[0009] The above-mentioned device for processing annular pre-fragmented micro-grooves is characterized in that: the pressure block is fixedly installed in the axial mounting groove by a first fastening bolt, and the limiting ring is fixedly installed on the end face of the annular cutter holder by a second fastening bolt; both ends of the blade have adjacent locking grooves and locking protrusions, and the limiting ring is provided with a clearance hole that cooperates with the locking protrusion.

[0010] The above-mentioned device for processing annular pre-fragmented micro-grooves is characterized in that: the bottom end of the annular cutter holder mounting section is provided with an external thread section, and a locking nut for pressing the second shaft end retaining ring is fitted on the external thread section.

[0011] The present invention also provides a method for processing annular pre-fragmented microgrooves using the above-described apparatus for processing annular pre-fragmented microgrooves, characterized by comprising the following steps:

[0012] Step 1: Install multiple annular pre-fragmented blanks on the broaching machine worktable:

[0013] Install the limiting sleeve on the broaching machine worktable, install the bushing inside the limiting sleeve, stack and arrange multiple annular pre-made fragment blanks inside the bushing, and install a clamping ring on the top of the limiting sleeve.

[0014] Step 2: Determine the number of broaching passes and the number of pin holes based on the number of microgrooves on the annular pre-formed fragments and the number of tool grooves on the tool setting ring;

[0015] The number of broaching operations is equal to the number of pin holes. Both the number of broaching operations n and the number of pin holes n satisfy n=M / m, where M is the number of micro-grooves of the annular pre-formed fragment and m is the number of tool grooves. That is, the combined broach can process m micro-grooves after each broaching operation. Therefore, broaching M micro-grooves requires broaching n times using the combined broach.

[0016] Step 3: Install the tool setting ring on the top surface of the clamping ring and insert the cylindrical pin into the first pin hole;

[0017] To ensure that the M microgrooves are evenly divided in the circumferential direction of the annular pre-formed fragment after n broachings, the hole position A1 of the first pin hole is set to 0°, and the hole position An of the nth pin hole is the angle An between the straight line connecting the center of the nth pin hole and the center of the tool setting ring and the straight line connecting the center of the first pin hole and the center of the tool setting ring. The hole position An of the nth pin hole satisfies the formula An=360°(n-1) / M.

[0018] Step 4: Install the combined broach on the broaching machine;

[0019] Step 5: After the combined broach moves downward and aligns with the tool setting ring, the combined broach is used to perform the first broaching on multiple annular pre-fabricated fragment blanks. When n=1, the broaching process ends; when n>1, proceed to step 6.

[0020] Step 6: Perform n-1 broaching operations sequentially. The process for any one broaching operation is as follows:

[0021] After the combined broach moves upward and returns to its original position, the tool setting ring is rotated to insert the cylindrical pin into the corresponding pin hole. After the combined broach moves downward and aligns with the tool setting ring, the combined broach is used to perform any one broaching operation on multiple annular pre-formed fragment blanks.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1. The device of the present invention includes a combined broach and a positioning component. In actual use, the positioning component can be used to fix multiple stacked annular pre-fragment blanks on the broaching machine worktable. The combined broach can be used to simultaneously broach and process multiple micro-grooves on multiple annular pre-fragment blanks. Compared with the existing technology of using laser cutting or water jet cutting to process micro-grooves, the processing efficiency of processing micro-grooves of annular pre-fragments using this device is high, which can meet the requirements of rapid and mass production of annular pre-fragments. Moreover, the processing cost is low and it is easy to promote and apply.

[0024] 2. The combined broach of the present invention includes a central shaft, an annular tool holder, cutting blades, a pressure block, and a limiting ring. In actual use, the annular tool holder is coaxially mounted on the central shaft, and the two ends of the central shaft are mounted on a broaching machine. By opening m axial mounting slots along the circumferential direction and arranged at equal intervals on the outer circular surface of the annular tool holder, a cutting blade is fixedly mounted in each axial mounting slot by a pressure block. When the broaching machine drives the combined broach to move from top to bottom for one working stroke, the m cutting blades can simultaneously cut m micro-grooves. Under the combined action of the pressure block and the limiting ring, the reliability of the cutting blades mounted on the annular tool holder can be guaranteed.

[0025] 3. The positioning component of this invention includes a limiting sleeve, a bushing, a clamping ring, and a tool setting ring. The combined action of the limiting sleeve, bushing, and clamping ring enables the fixed installation of multiple annular pre-fragmented blanks on the broaching machine table. During broaching, the multiple annular pre-fragmented blanks will not shift or deform. By opening m tool setting grooves on the tool setting ring, the tool setting ring and the clamping ring are actually connected by cylindrical pins during installation. One end of the cylindrical pin is fixedly installed on the tool setting ring, and the clamping ring has multiple pin holes for inserting the other end of the cylindrical pin. In actual use, by selecting different pin holes to insert the cylindrical pin, the installation direction of the tool setting ring can be rotated. Through multiple tool setting and multiple cutting operations, more dense micro-grooves can be cut on multiple annular pre-fragmented blanks, eliminating the need for secondary clamping of the combined broach, thus improving cutting efficiency and accuracy, and facilitating widespread application.

[0026] 4. The processing method of the present invention is reasonably designed, easy to operate, and convenient for promotion and application.

[0027] In summary, this invention utilizes a positioning component to fix multiple stacked annular pre-fragment blanks on a broaching machine table. A combined broach is then used to simultaneously broach and machine multiple microgrooves on these annular pre-fragment blanks. This device offers high processing efficiency for machining microgrooves in annular pre-fragmented parts, enabling rapid and mass production of annular pre-fragmented parts. Furthermore, it has low processing costs and is easy to promote and apply.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the annular pre-fragmented fragment of the present invention.

[0030] Figure 2 This is a schematic diagram of the combined broach of the present invention.

[0031] Figure 3 This is a schematic diagram of the installation structure of the annular cutter holder, blade, pressure block, and limiting ring of the present invention.

[0032] Figure 4 This is a schematic diagram of the blade of the present invention.

[0033] Figure 5 This is a schematic diagram of the installation structure of the broaching machine worktable, positioning components, and multiple annular pre-fabricated fragment blanks of the present invention.

[0034] Figure 6 for Figure 5 AA sectional view.

[0035] Figure 7 This is a flowchart of the method of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1—Central shaft; 1-1—Annular tool holder mounting section; 1-2—Top connecting section;

[0038] 1-3—Bottom connecting section; 2—Annular tool holder; 2-1—Axial mounting groove;

[0039] 2-2—Radial mounting groove; 3—Insert blade; 3-1—Cutting tooth;

[0040] 3-2—Mounting groove; 3-2—Mounting protrusion; 4—Pressure block;

[0041] 5—First fastening bolt; 6—Limiting ring; 7—Second fastening bolt;

[0042] 8—First shaft end retaining ring; 9—Second shaft end retaining ring; 10—Locking nut;

[0043] 11—Plain key; 12—Hand sleeve; 13—Connector;

[0044] 14—Broaching machine worktable; 15—Limit sleeve; 16—Pressure ring;

[0045] 16-1—Pin hole; 17—Tool setting ring; 17-1—Tool setting groove;

[0046] 18—Cylindrical pin; 19—Annular pre-fragmented blank; 20—Annular pre-fragmented part;

[0047] 20-1—Miniature trough. Detailed Implementation

[0048] like Figures 1 to 6As shown, an apparatus for processing annular pre-fragmented microgrooves includes a combined broach for broaching multiple microgrooves 20-1 at a time and a positioning assembly set on a broaching machine worktable 14 for stacking multiple annular pre-fragmented blanks 19. The combined broach includes a central shaft 1 and an annular tool holder 2 coaxially mounted on the central shaft 1. The outer circumferential surface of the annular tool holder 2 has m axial mounting grooves 2-1 arranged at equal intervals along the circumferential direction, where m is a positive integer. A cutting blade 3 and a clamping block for clamping the cutting blade 3 are installed in each axial mounting groove 2-1. 4. Both ends of the annular tool holder 2 are provided with limiting rings 6 for limiting the axial position of multiple blades 3. The positioning assembly includes a limiting sleeve 15 installed on the broaching table 14, a bushing 12 coaxially installed in the limiting sleeve 15, a clamping ring 16 installed on the top of the limiting sleeve 15, and a tool setting ring 17 installed on the clamping ring 16. The tool setting ring 17 has m tool setting grooves 17-1. A cylindrical pin 18 is provided between the tool setting ring 17 and the clamping ring 16. The clamping ring 16 has multiple pin holes 16-1 for the cylindrical pin 18 to be installed.

[0049] In this embodiment, the device includes a combined broach and a positioning component. In actual use, the positioning component can be used to fix multiple stacked annular pre-fragment blanks 19 on the broaching table 14. The combined broach is used to simultaneously broach and process multiple micro-grooves 20-1 on the multiple annular pre-fragment blanks 19. Compared with the existing technology of using laser cutting or water jet cutting to process micro-grooves 20-1, the processing efficiency of processing micro-grooves of annular pre-fragments using this device is high, which can meet the requirements of rapid and mass production of annular pre-fragments. Moreover, the processing cost is low, which makes it easy to promote and apply.

[0050] like Figure 2 and Figure 3 As shown, in this embodiment, the combined broach includes a central shaft 1, an annular tool holder 2, blades 3, a pressure block 4, and a limiting ring 6. In actual use, the annular tool holder 2 is coaxially mounted on the central shaft 1, and both ends of the central shaft 1 are mounted on a broaching machine. By opening m axial mounting grooves 2-1 along the circumferential direction and arranged at equal intervals on the outer circular surface of the annular tool holder 2, a blade 3 is fixedly mounted in each axial mounting groove 2-1 by a pressure block 4. When the broaching machine drives the combined broach to move from top to bottom for one working stroke, the m blades 3 can simultaneously cut m micro-grooves 20-1. Under the joint action of the pressure block 4 and the limiting ring 6, the reliability of the blades 3 mounted on the annular tool holder 2 can be guaranteed.

[0051] like Figure 5 and Figure 6As shown, in this embodiment, the positioning assembly includes a limiting sleeve 15, a bushing 12, a clamping ring 16, and a tool setting ring 17. It should be noted that the central hole of the bushing 12 is a stepped hole, which includes a large-diameter section and a small-diameter section located at the bottom of the large-diameter section. The diameter of the large-diameter section is equal to the diameter of the annular pre-fragmented blank 19. The top surface of the small-diameter section forms an annular boss for supporting multiple annular pre-fragmented blanks 19. The diameter of the small-diameter section is larger than the diameter of the central circle where the bottoms of multiple micro-grooves 20-1 are located. When the combined broach moves downwards to cut multiple... When there is a micro-groove 20-1, the small diameter hole section needs to avoid contact with multiple cutting tools 3; the center hole of the clamping ring 16 is also a stepped hole. The stepped hole of the clamping ring 16 can simultaneously clamp the bushing 12 and multiple annular pre-fragmented blanks 19, and the clamping ring 16 also needs to avoid contact with multiple cutting tools 3. With the combined action of the limiting sleeve 15, the bushing 12 and the clamping ring 16, multiple annular pre-fragmented blanks 19 can be fixedly installed on the broaching table 14. During the broaching process, multiple annular pre-fragmented blanks 19 will not shift or deform.

[0052] In this embodiment, m tool setting grooves 17-1 are opened on the tool setting ring 17. During actual installation, the tool setting ring 17 and the clamping ring 16 are positioned and connected by cylindrical pins 18. One end of the cylindrical pin 18 is fixedly installed on the tool setting ring 17. The clamping ring 16 has multiple pin holes 16-1 for inserting the other end of the cylindrical pin 18. In actual use, by selecting different pin holes 16-1 to insert the cylindrical pin 18, the installation direction of the tool setting ring 17 can be rotated. Through multiple tool setting and multiple cutting, more dense micro-grooves 20-1 can be cut on multiple annular pre-fragmented blanks 19. There is no need for secondary clamping of the combined broach, which helps to improve cutting efficiency and cutting accuracy and facilitates its widespread application.

[0053] In this embodiment, the blade 3 has N cutting teeth 3-1 on its cutting edge, and the height difference t between two adjacent cutting teeth 3-1 satisfies t=h / N, where h is the groove depth of the micro groove 20-1 of the annular pre-fragmented fragment 20, and h and N are both positive integers. The thickness of the cutting tooth 3-1 is equal to the groove width of the micro groove 20-1.

[0054] In this embodiment, the central shaft 1 includes an annular tool holder mounting section 1-1, a top connecting section 1-2 and a bottom connecting section 1-3 coaxially disposed at both ends of the annular tool holder mounting section 1-1, and a connector 13 for connecting with a broaching clamp is provided at the top end of the top connecting section 1-2 and the bottom end of the bottom connecting section 1-3.

[0055] In this embodiment, there are three annular tool holders 2. The three annular tool holders 2 are coaxially mounted on the annular tool holder mounting section 1-1. The cutting depth of the three blades 3 located on the same plane is equal to the groove depth of the micro-groove 20-1.

[0056] In this embodiment, the annular tool holder mounting section 1-1 is connected to the annular tool holder 2 by a flat key 11. The annular tool holder mounting section 1-1 is fitted with a first shaft end retaining ring 8 located at the top of the annular tool holder 2 and a second shaft end retaining ring 9 located at the bottom of the annular tool holder 2.

[0057] like Figure 3 and Figure 4 As shown, in this embodiment, the pressure block 4 is fixedly installed in the axial mounting groove 2-1 by the first fastening bolt 5, and the limiting ring 6 is fixedly installed on the end face of the annular blade holder 2 by the second fastening bolt 7; both ends of the blade 3 have adjacent clamping grooves 3-2 and clamping protrusions 3-3, and the limiting ring 6 is provided with a clearance hole 6-1 that cooperates with the clamping protrusions 3-3.

[0058] In this embodiment, the pressure block 4 and the first fastening bolt 5 can press the blade 3 onto one side wall of the axial mounting groove 2-1. By providing a clamping groove 3-2 at both ends of the blade 3, during actual installation, the limiting ring 6 is clamped in the clamping groove 3-2, and the clamping protrusion 3-3 passes through the relief hole 6-1, which can limit the axial installation position of the blade 3 and prevent displacement of the blade 3 in the axial direction.

[0059] like Figure 2 As shown, in this embodiment, the bottom end of the annular tool holder mounting section 1-1 is provided with an external thread section, and a locking nut 10 for pressing the second shaft end retaining ring 9 is fitted on the external thread section.

[0060] In actual use, during the downward movement of the combined broach, the locking nut 10 can buffer the impact force of the three annular cutter holders 2 and the second shaft end retaining ring 9 moving downward.

[0061] like Figure 7 A method for processing annular pre-fragmented microgrooves, as shown, includes the following steps:

[0062] Step 1: Install multiple annular pre-fragmented blanks 19 on the broaching machine worktable 14:

[0063] The limiting sleeve 15 is installed on the broaching machine worktable 14, the bushing 12 is installed inside the limiting sleeve 15, a plurality of annular pre-made fragment blanks 19 are stacked and arranged inside the bushing 12, and a clamping ring 16 is installed at the top of the limiting sleeve 15.

[0064] Step 2: Determine the number of broaching passes and the number of pin holes 16-1 based on the number of microgrooves 20-1 on the annular pre-fragmented fragment 20 and the number of tool setting grooves 17-1 on the tool setting ring 17;

[0065] The number of broaching operations is equal to the number of pin holes 16-1. Both the number of broaching operations n and the number of pin holes 16-1 n satisfy n=M / m, where M is the number of micro-grooves 20-1 of the annular pre-formed fragment 20 and m is the number of tool setting grooves 17-1. That is, the combined broach can process m micro-grooves 20-1 after each broaching operation. Therefore, broaching M micro-grooves 20-1 requires broaching n times using the combined broach.

[0066] Step 3: Install the tool setting ring 17 on the top surface of the clamping ring 16, and insert the cylindrical pin 18 into the first pin hole 16-1;

[0067] To ensure that the M micro-grooves (20-1) are evenly divided in the circumferential direction of the annular pre-formed fragment (20) after n broachings, the hole position A1 of the first pin hole (16-1) is set to 0°, and the hole position An of the nth pin hole (16-1) is the angle An between the straight line connecting the center of the nth pin hole (16-1) and the center of the tool setting ring (17) and the straight line connecting the center of the first pin hole (16-1) and the center of the tool setting ring (17). The hole position An of the nth pin hole (16-1) satisfies the formula An=360°(n-1) / M.

[0068] In this embodiment, there are 45 micro-grooves 20-1, 15 tool grooves 17-1, and 3 pin holes 16-1. The first pin hole (16-1) has a hole position A1 of 0°, the second pin hole (16-1) has a hole position A2 of 8°, and the third pin hole (16-1) has a hole position A3 of 16°. In actual processing, because the distance between the three pin holes (16-1) processed according to this rule is relatively close, according to the optimization formula An... 优 =360° (n-1) (1 / M+1 / m) is determined, and the optimized hole position A of the second pin hole (16-1) is determined. 2优 The optimized hole position A of the third pin hole (16-1) is 32°. 3优 It is 72°.

[0069] Step 4: Install the combined broach on the broaching machine;

[0070] Step 5: After the combined broach moves downward and aligns with the tool setting ring 17, the combined broach is used to perform the first broaching on multiple annular pre-formed fragment blanks 19. When n=1, the broaching process ends; when n>1, proceed to step 6.

[0071] Step 6: Perform n-1 broaching operations sequentially. The process for any one broaching operation is as follows:

[0072] After the combined broach moves upward and returns to its original position, the tool setting ring 17 is rotated to insert the cylindrical pin 18 into the corresponding pin hole 16-1. After the combined broach moves downward and aligns with the tool setting ring 17, the combined broach is used to perform any one broaching operation on multiple annular pre-formed fragment blanks 19.

[0073] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An apparatus for processing annular pre-formed fragment microgrooves, characterized in that: The broach includes a combined broach for broaching multiple microgrooves (20-1) at one time and a positioning assembly set on the broaching table (14) for stacking multiple annular pre-fragmented blanks (19). The combined broach includes a central shaft (1) and an annular tool holder (2) coaxially mounted on the central shaft (1). The outer circumferential surface of the annular tool holder (2) is provided with m axial mounting grooves (2-1) arranged at equal intervals along the circumferential direction, where m is a positive integer. A cutting tool (3) and a clamping block (4) for clamping the cutting tool (3) are installed in each axial mounting groove (2-1). Both ends of the annular tool holder (2) are provided with A limiting ring (6) for defining the axial position of multiple blades (3), the positioning assembly includes a limiting sleeve (15) mounted on the broaching table (14), a bushing (12) coaxially mounted in the limiting sleeve (15), a clamping ring (16) mounted on the top of the limiting sleeve (15) and a tool setting ring (17) mounted on the clamping ring (16), the tool setting ring (17) having m tool setting grooves (17-1), a cylindrical pin (18) being provided between the tool setting ring (17) and the clamping ring (16), and the clamping ring (16) having multiple pin holes (16-1) for mounting the cylindrical pin (18).

2. The apparatus for processing annular pre-fragmented microgrooves according to claim 1, characterized in that: The blade (3) has N cutting teeth (3-1) on its cutting edge. The height difference t between two adjacent cutting teeth (3-1) satisfies t=h / N, where h is the groove depth of the micro groove (20-1) of the annular pre-formed fragment (20), and h and N are both positive integers. The thickness of the cutting tooth (3-1) is equal to the groove width of the micro groove (20-1).

3. The apparatus for processing annular pre-fragmented microgrooves according to claim 1, characterized in that: The central shaft (1) includes an annular tool holder mounting section (1-1), a top connecting section (1-2) and a bottom connecting section (1-3) coaxially arranged at both ends of the annular tool holder mounting section (1-1), and a connector (13) for connecting with a broaching clamp is provided at the top end of the top connecting section (1-2) and the bottom end of the bottom connecting section (1-3).

4. The apparatus for processing annular pre-fragmented microgrooves according to claim 3, characterized in that: The number of the annular cutter holders (2) is three. The three annular cutter holders (2) are coaxially mounted on the annular cutter holder mounting section (1-1). The cutting depth of the three blades (3) located on the same plane is equal to the groove depth of the micro groove (20-1).

5. The apparatus for processing annular pre-fragmented microgrooves according to claim 3, characterized in that: The annular tool holder mounting section (1-1) is connected to the annular tool holder (2) by a flat key (11). The annular tool holder mounting section (1-1) is fitted with a first shaft end retaining ring (8) located at the top of the annular tool holder (2) and a second shaft end retaining ring (9) located at the bottom of the annular tool holder (2).

6. The apparatus for processing annular pre-fragmented microgrooves according to claim 2, characterized in that: The pressure block (4) is fixedly installed in the axial mounting groove (2-1) by the first fastening bolt (5), and the limiting ring (6) is fixedly installed on the end face of the annular cutter holder (2) by the second fastening bolt (7); both ends of the blade (3) have adjacent clamping grooves (3-2) and clamping protrusions (3-3), and the limiting ring (6) has a clearance hole (6-1) that matches the clamping protrusion (3-3).

7. The apparatus for processing annular pre-fragmented microgrooves according to claim 5, characterized in that: The bottom end of the annular tool holder mounting section (1-1) is provided with an external thread section, and a locking nut (10) for pressing the second shaft end retaining ring (9) is fitted on the external thread section.

8. A method for processing annular pre-fragmented microgrooves using the apparatus for processing annular pre-fragmented microgrooves as described in claim 1, characterized in that: The following steps are involved: Step 1: Install multiple annular pre-formed fragment blanks (19) on the broaching machine worktable (14): Install the limiting sleeve (15) on the broaching machine worktable (14), install the bushing (12) inside the limiting sleeve (15), stack and arrange multiple annular pre-made fragment blanks (19) inside the bushing (12), and install the clamping ring (16) at the top of the limiting sleeve (15). Step 2: Determine the number of broaching passes and the number of pin holes (16-1) based on the number of microgrooves (20-1) on the annular pre-formed fragment (20) and the number of tool grooves (17-1) on the tool setting ring (17); The number of broaching operations is equal to the number of pin holes (16-1). The number of broaching operations n and the number of pin holes (16-1) n both satisfy n=M / m, where M is the number of micro-grooves (20-1) of the annular pre-formed fragment (20), and m is the number of tool setting grooves (17-1). That is, the combined broach can process m micro-grooves (20-1) after each broaching operation. Therefore, broaching M micro-grooves (20-1) requires broaching n times using the combined broach. Step 3: Install the tool setting ring (17) on the top surface of the clamping ring (16) and insert the cylindrical pin (18) into the first pin hole (16-1); To ensure that the M micro-grooves (20-1) are evenly divided in the circumferential direction of the annular pre-formed fragment (20) after n broachings, the hole position A1 of the first pin hole (16-1) is set to 0°, and the hole position An of the nth pin hole (16-1) is the angle An between the straight line connecting the center of the nth pin hole (16-1) and the center of the tool setting ring (17) and the straight line connecting the center of the first pin hole (16-1) and the center of the tool setting ring (17). The hole position An of the nth pin hole (16-1) satisfies the formula An=360°(n-1) / M. Step 4: Install the combined broach on the broaching machine; Step 5: After the combined broach moves downward and aligns with the tool setting ring (17), the combined broach is used to perform the first broaching on multiple annular pre-made fragment blanks (19). When n=1, the broaching process ends; when n>1, step 6 is executed. Step 6: Perform n-1 broaching operations sequentially. The process for any one broaching operation is as follows: After the combined broach moves upward and returns to its original position, rotate the tool setting ring (17) and insert the cylindrical pin (18) into the corresponding pin hole (16-1). After the combined broach moves downward and aligns with the tool setting ring (17), use the combined broach to perform any one broaching operation on multiple annular pre-formed fragment blanks (19).

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