Method and system for removing burrs from intersecting holes in a workpiece

Abstract

The application belongs to the technical field of machining, and particularly discloses a machining method and system for removing burrs in intersecting holes in a workpiece, which comprises the following steps: assembling a prefabricated protection clamp assembly on the workpiece to form a burr machining unit, wherein the protection clamp assembly comprises a through-slot protection structure matched with a through slot, a burr machining space is reserved between the through-slot protection structure and the intersecting holes, the through-slot protection structure is provided with an abrasive flow channel, and the abrasive flow channel is in communication with the burr machining space; and assembling multiple burr machining units in an abrasive lifting device, and extruding fluid abrasive into the burr machining unit through the abrasive flow channel by using the abrasive lifting device, so that the fluid abrasive generates a fluid extrusion cutting force for removing the burrs in the burr machining space. The machining efficiency for removing the burrs in the workpiece is high, the smooth progress of the matching process is ensured, and the production bottleneck is solved.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically relating to a machining method and system for removing burrs from intersecting holes in a workpiece. Background Technology

[0002] As the core component of the hydraulic servo control system, the pump provides reliable and stable pressure for the stable operation of the hydraulic steering gear. The cylinder body, as the main part of the pump, is made of aluminum bronze rod (QAl9-4). Its structural feature is that this part is mainly composed of holes. The main structure consists of 10 plunger holes of Φ6.5 (+0.004 / 0) mm distributed at 72° and 36° angles on both sides, and 10 sets of Φ8.2H9 one-way valve cap holes. Among them, the coaxial Φ8.2H9, M8×0.5-6H, and Φ4H9 form one set. The plunger holes and the one-way valve plug holes are located on different pitch circles. The opposing plunger holes are offset by 36°. The positional accuracy relative to the end face, outer circle, and opposing plunger hole is Φ0.1mm. The wall roughness of the Φ6.5 (+0.004 / 0) mm hole is required to be Ra0.2. The surface roughness of the sealing step of the (M8×0.5-6H) thread base hole is Ra0.2, and the flatness is 0.005mm. The positional and dimensional accuracy requirements are very high. The two ends intersect and are connected, so a large number of machining burrs are generated at the intersection during the machining process, which are difficult to remove. Since the quality control of the key positions of the cylinder block often directly affects the performance of the entire product, especially if the burrs at the intersection of the holes are not completely removed, they will often form foreign matter, causing the operation to be stuck, and eventually leading to product failure.

[0003] Currently, the main traditional deburring methods include manual removal, ultrasonic removal, electrolysis, and high-pressure water jetting. Ultrasonic deburring is only suitable for microscopic removal. Electrolysis deburring, due to the corrosive nature of the electrolyte, can easily corrode parts, affecting their appearance and dimensional accuracy. High-pressure water jetting is mainly suitable for large parts and parts with low dimensional accuracy requirements, but not for cylinders with very high positional and dimensional accuracy requirements. Manual deburring requires a fitter to manually remove burrs from intersecting holes in cylinders under a 20x microscope using specialized tools. This involves removing 20 burrs from both sides of a single cylinder, resulting in a large workload, high labor costs, and low processing efficiency. It also easily scratches the walls and bottoms of critical holes, affecting product quality. Furthermore, burrs are often not completely removed, making it unsuitable for deburring parts with complex internal structures such as curved holes, intersecting holes, and irregularly shaped micro-holes. During batch processing of parts, inspectors need to repeatedly check under a microscope, and fitters need to repeatedly operate the machine. Despite this repeated operation, burrs are often not completely removed, resulting in excess material that affects product quality and can even damage the pump. With increasing production demands, the deburring bottleneck in cylinder block intersecting holes has become prominent, severely impacting the production schedule. There is an urgent need to adopt automated deburring methods to improve processing efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a processing method and system for removing burrs from intersecting holes in a workpiece, so as to at least solve the bottleneck problem of deburring intersecting holes mentioned in the prior art, which seriously affects the progress of the process.

[0005] To achieve the above objective, a first aspect of the present invention provides a machining method for removing burrs from intersecting holes in a workpiece, wherein the workpiece has a plurality of intersecting holes, and both ends of the intersecting holes have through grooves penetrating the workpiece, the method comprising:

[0006] The prefabricated protective fixture assembly is assembled on the workpiece to form a burr processing unit. The protective fixture assembly includes a through groove protection structure adapted to the through groove. A burr processing space is reserved between the through groove protection structure and the intersecting hole. The through groove protection structure is provided with an abrasive flow channel, and the abrasive flow channel communicates with the burr processing space.

[0007] Multiple deburring units are assembled in an abrasive drawing device. The abrasive drawing device is used to extrude fluid abrasive through the abrasive channel into the deburring unit, so that the fluid abrasive generates a fluid extrusion cutting force to remove burrs in the deburring space.

[0008] Furthermore, it also includes:

[0009] A predetermined installation gap is provided at the contact point between the through-slot protection structure and the through-slot, ensuring that the fluid abrasive will not be squeezed and flowed within the installation gap having the predetermined distance.

[0010] Furthermore, the through groove includes threaded holes located at both ends of the intersecting hole, and the through groove protection structure includes:

[0011] A threaded protective plug is provided, which is used to be screwed into the threaded hole. A burr processing space is reserved between the threaded protective plug and the intersecting hole. The threaded protective plug is provided with an abrasive flow channel that communicates with the burr processing space.

[0012] Furthermore, the through slot also includes light holes located at both ends of the intersecting hole, and the through slot protection structure further includes:

[0013] A light hole protection plug is inserted into the light hole, and a burr processing space is reserved between the light hole protection plug and the intersecting hole. The light hole protection plug is provided with an abrasive flow channel that communicates with the burr processing space.

[0014] Furthermore, the protective clamp assembly also includes:

[0015] An end face protective cover is provided, on which multiple abrasive inlets are reserved, and the abrasive inlets are configured and connected to the abrasive flow channels one by one.

[0016] Further, the abrasive drawing device includes a first material cylinder and a second material cylinder arranged opposite to each other, and the fluid abrasive is placed in the first material cylinder and / or the second material cylinder; the step of assembling a plurality of the deburring units in the abrasive drawing device, and using the abrasive drawing device to extrude the fluid abrasive through the abrasive flow channel into the deburring unit, so that the fluid abrasive generates a fluid extrusion cutting force for deburring in the deburring space, includes:

[0017] Multiple deburring units are assembled between the first and second material cylinders. During the bidirectional lifting motion of the fluid abrasive between the first and second material cylinders using the abrasive lifting device, the fluid abrasive is squeezed into the deburring unit through the abrasive flow channel, so that the fluid abrasive generates a fluid extrusion cutting force to remove burrs in the deburring space.

[0018] Furthermore, the step of assembling multiple deburring units in an abrasive drawing device, and using the abrasive drawing device to extrude fluid abrasive through the abrasive channel into the deburring unit, so that the fluid abrasive generates a fluid extrusion cutting force for deburring in the deburring space, further includes:

[0019] Multiple deburring units are assembled between the first and second material cylinders using a prefabricated equipment connecting fixture;

[0020] During the bidirectional lifting motion of the fluid abrasive between the first and second cylinders, the abrasive is squeezed into the burr processing space through the abrasive channels on each of the burr processing units, and a fluid extrusion cutting force is generated in the burr processing space to remove burrs.

[0021] Furthermore, the device connection fixture includes:

[0022] A first connecting plate is provided with a plurality of first abrasive extrusion ports that communicate with the first material cylinder;

[0023] A protective support sleeve is fixed to the first connecting plate. The protective support sleeve is provided with an assembly space that is adapted to the outer periphery of the burr processing unit. The burr processing unit is assembled in the assembly space.

[0024] The second connecting plate is provided with a plurality of second abrasive extrusion ports that communicate with the second material cylinder;

[0025] The abrasive channels on the deburring unit are connected to the first abrasive extrusion port and the second abrasive extrusion port in a one-to-one correspondence.

[0026] In a second aspect, the present invention also provides a machining system for removing burrs from intersecting holes in a workpiece. The system utilizes the aforementioned method for removing burrs from intersecting holes in a workpiece to remove burrs from the intersecting holes. The system comprises:

[0027] A protective clamping assembly is used to assemble the workpiece to form a burr processing unit. The protective clamping assembly includes a through groove protection structure adapted to the through groove. A burr processing space is reserved between the through groove protection structure and the intersecting hole. The through groove protection structure is provided with an abrasive flow channel, and the abrasive flow channel communicates with the burr processing space.

[0028] An abrasive drawing device is provided, in which multiple burr-processing units are assembled. The abrasive drawing device is used to extrude fluid abrasive through the abrasive channel into the burr-processing units, so that the fluid abrasive generates a fluid extrusion cutting force to remove burrs in the burr-processing space.

[0029] Furthermore, the abrasive drawing device includes a first material cylinder and a second material cylinder arranged opposite to each other, the fluid abrasive being placed in the first material cylinder and / or the second material cylinder, and the system further includes:

[0030] A device connecting fixture is used to assemble a plurality of the burr processing units between the first material cylinder and the second material cylinder.

[0031] Compared with the prior art, the technical solution provided by the present invention has at least the following technical effects:

[0032] Fluid abrasive is extruded into the deburring unit through an abrasive channel using an abrasive drawing device. The fluid abrasive generates a cutting force within the deburring space to remove burrs from intersecting holes in the workpiece, achieving automated deburring of intersecting holes via fluid extrusion cutting. This method breaks through the traditional deburring process, eliminating manual labor and achieving automated processing. It not only effectively removes burrs but also improves the surface roughness of holes and other surfaces. It can be widely used in tooling components of various products and models with intersecting holes, and is particularly suitable for parts with complex internal structures and high precision, such as micro-holes, irregularly shaped intersecting holes, and internally curved holes. While avoiding damage to the workpiece, it removes burrs cleanly and achieves high processing quality. Compared to traditional processing methods, the deburring method provided by this invention improves processing efficiency by more than 90%, ensuring smooth progress of production and solving production bottlenecks. Attached Figure Description

[0033] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0034] Figure 1 This is a schematic flowchart of a processing method for removing burrs from intersecting holes in a workpiece according to an embodiment of the present invention.

[0035] Figure 2 This is a schematic diagram of the workpiece cylinder body;

[0036] Figure 3 A schematic diagram of the machining connection between the abrasive drawing device and the equipment connection fixture equipped with the burr processing unit;

[0037] Figure 4 A schematic diagram of the structure of a deburring unit;

[0038] Figure 5 for Figure 4 An explosion diagram;

[0039] Figure 6 for Figure 4 A sectional view;

[0040] Figure 7 A schematic diagram of the structure of the equipment connection fixture for assembling burr processing units;

[0041] Figure 8 This is a top view of the first connecting plate;

[0042] Figure 9 A schematic diagram of the connection structure between the first connecting plate and the protective support sleeve;

[0043] Figure 10 This is an illustration of the deburring action relationship provided in an embodiment of the present invention;

[0044] Figure 11 This is a diagram showing the state of the burrs at the intersecting holes of the cylinder block before burr processing.

[0045] Figure 12 This is a diagram showing the effect after burr removal at the intersecting holes of the cylinder block.

[0046] Explanation of reference numerals in the attached figures:

[0047] 10. Workpiece; 11. Intersecting hole; 12. Smooth hole; 13. Threaded hole; 131. Sealing step surface; 20. Protective clamp assembly; 21. End face protective cover; 211. Abrasive inlet; 22. Smooth hole protective plug; 23. Threaded protective plug; 24. Installation gap; A. Burr processing space; B. Abrasive flow channel; 102. Burr processing unit; 30. Abrasive lifting equipment; 31. First material cylinder; 32. Second material cylinder; 40. Equipment connecting clamp; 41. First connecting plate; 411. First abrasive extrusion port; 42. Protective support sleeve; 421. Assembly space; 43. Second connecting plate; 431. Second abrasive extrusion port. Detailed Implementation

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and are not to a precise scale, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0049] It should be noted that, in order to clearly illustrate the content of this invention, several embodiments are provided to further explain different implementations of the invention. These embodiments are enumerated rather than exhaustive. Furthermore, for the sake of brevity, content mentioned in the preceding embodiments is often omitted in the following embodiments. Therefore, content not mentioned in the later embodiments can be referred to in the preceding embodiments.

[0050] Please see Figure 1 The first embodiment of the present invention provides a machining method for removing burrs from intersecting holes 11 in a workpiece 10. The workpiece 10 has multiple intersecting holes 11, and each intersecting hole 11 has a through groove at both ends that penetrates the workpiece 10. Figure 2As shown, when the workpiece 10 is the cylinder body of the pump body, the through groove is a smooth hole 12 and a threaded hole 13 located at both ends of the intersecting hole 11 in the cylinder body. The method includes the following steps:

[0051] Step S11: Assemble the prefabricated protective fixture assembly 20 onto the workpiece 10 to form a burr processing unit 102. The protective fixture assembly 20 includes a through groove protection structure adapted to the through groove. A burr processing space A is reserved between the through groove protection structure and the intersecting hole 11. The through groove protection structure is provided with an abrasive flow channel B, which is connected to the burr processing space A.

[0052] Step S12: Multiple deburring units 102 are assembled in the abrasive drawing device 30. The abrasive drawing device 30 uses fluid abrasive to be extruded into the deburring unit 102 through the abrasive channel B, causing the fluid abrasive to generate a fluid extrusion cutting force in the deburring space A to remove burrs. This fluid extrusion cutting force removes burrs at the intersecting holes 11 within the workpiece 10, effectively removing burrs and improving the surface roughness of the holes and other surfaces. See details... Figure 3 The diagram shows the machining connection between the abrasive drawing device 30 and the equipment connection fixture equipped with the burr processing unit 102. Figure 4 and Figure 5 A schematic diagram of the specific structure of the deburring unit 102.

[0053] Considering the complex structure and high precision of workpiece 10, in order to facilitate operation and avoid compromising the precision of workpiece 10, such as Figure 6 As shown, the method provided in this embodiment of the invention further includes: reserving an installation gap 24 at a predetermined distance at the contact point between the through groove protection structure and the through groove.

[0054] Please see below. Figure 5 When the through groove of the workpiece 10 includes threaded holes 13 located at both ends of the intersecting hole 11, the through groove protection structure of the protective fixture assembly 20 includes: a threaded protective plug 23, the threaded structure on the outside of the threaded protective plug 23 is adapted to the threaded hole 13, the threaded protective plug 23 is used to be screwed into the threaded hole 13, a burr processing space A is reserved between the threaded protective plug 23 and the intersecting hole 11, and the threaded protective plug 23 is provided with an abrasive flow channel B that communicates with the burr processing space A.

[0055] Please see below. Figure 5 The through groove of workpiece 10 also includes light holes 12 located at both ends of the intersecting hole 11. The through groove protection structure of the protective fixture assembly 20 also includes: light hole protection plug 22, which is inserted into the light hole 12. A burr processing space A is reserved between the light hole protection plug 22 and the intersecting hole 11. The light hole protection plug 22 is provided with an abrasive flow channel B that communicates with the burr processing space A.

[0056] Specifically, please see Figure 6 A predetermined installation gap 24 is provided between the threaded protective plug 23 and the sealing step surface 131 at the bottom of the threaded hole 13. In this embodiment of the invention, a 0.1mm installation gap 24 is provided at the sealing step surface 131 at the bottom of the threaded hole 13. This 0.1mm installation gap 24 ensures that the fluid abrasive will not be squeezed or flowed within the reserved installation gap 24 without damaging the workpiece 10. The lack of flow will not affect the critical positions of the workpiece 10. The characteristics of this predetermined installation gap 24 are obtained through repeated comparative experiments. A predetermined installation gap 24 is provided between the hole protective plug 22 and the inner wall of the hole 12, such as a 0.5mm installation gap 24. This 0.5mm installation gap 24 ensures that the fluid abrasive will not be squeezed or flowed within the reserved installation gap 24 without damaging the workpiece 10. The lack of flow will not affect the inner wall of the workpiece 10. This ensures that the precision of the threaded hole 13 and the hole 12 of the workpiece 10 is not compromised.

[0057] Please see Figure 5 The protective fixture assembly 20 also includes an end face protective cover 21, which protects the ends of the workpiece 10. The end face protective cover 21 has multiple abrasive inlets 211 pre-drilled, each corresponding to and communicating with an abrasive flow channel B. This allows the abrasive drawing device 30 to expel fluid abrasive from the abrasive inlets 211 and abrasive flow channels B into the deburring unit 102, generating a fluid extrusion cutting force in the deburring space A to remove burrs. Specifically, the abrasive flow channels B on each thread protection plug 23 correspond to and communicate with the abrasive inlets 211 at corresponding positions on the end face protective cover 21. Furthermore, in this embodiment, the aperture protection plug 22 is fixed to the end face protective cover 21. During fixing, the abrasive flow channels B of each aperture protection plug 22 correspond to and communicate with the corresponding abrasive inlets 211. Fixing the aperture protection plug 22 to the end face protective cover 21 facilitates the loading and unloading of the fixture.

[0058] Please see Figure 3 The abrasive drawing device 30 includes a first material cylinder 31 and a second material cylinder 32 arranged opposite to each other, with fluid abrasive placed in the first material cylinder 31 and / or the second material cylinder 32. Step S12 involves assembling multiple deburring units 102 in the abrasive drawing device 30, and using the abrasive drawing device 30 to extrude the fluid abrasive through the abrasive flow channel B into the deburring unit 102, so that the fluid abrasive generates a fluid extrusion cutting force for deburring in the deburring space A. Specifically, this step includes:

[0059] Multiple burr processing units 102 are assembled between the first material cylinder 31 and the second material cylinder 32. During the bidirectional lifting motion of the fluid abrasive between the first material cylinder 31 and the second material cylinder 32 using the abrasive lifting device 30, the fluid abrasive is squeezed into the burr processing unit 102 through the abrasive flow channel B, so that the fluid abrasive generates a fluid extrusion cutting force to remove burrs in the burr processing space A.

[0060] Specifically, step S12, which assembles multiple deburring units 102 in an abrasive drawing device 30 and uses the abrasive drawing device 30 to extrude fluid abrasive through the abrasive channel B into the deburring unit 102, further includes the following step:

[0061] Multiple burr processing units 102 are assembled between the first material cylinder 31 and the second material cylinder 32 via a prefabricated equipment connecting fixture 40. During the bidirectional pulling motion of the fluid abrasive between the first material cylinder 31 and the second material cylinder 32 by the abrasive pulling device 30, the fluid abrasive is squeezed into the burr processing space A through the abrasive flow channel B on each burr processing unit 102, and a fluid extrusion cutting force for removing burrs is generated in the burr processing space A.

[0062] Please see Figures 7 to 9 The equipment connecting fixture 40 includes a first connecting plate 41, a protective support sleeve 42, and a second connecting plate 43. The first connecting plate 41 is provided with multiple first abrasive extrusion ports 411 (e.g., [missing information]) that communicate with the first material cylinder 31. Figure 8 (As shown). The protective support sleeve 42 is fixed on the first connecting plate 41, and the protective support sleeve 42 is provided with an assembly space 421 that is adapted to the outer periphery of the burr processing unit 102 (as shown). Figure 9 As shown, the deburring unit 102 is assembled in the assembly space 421. The second connecting plate 43 is provided with a plurality of second abrasive extrusion ports 431 that communicate with the second material cylinder 32. The abrasive flow channel B on the deburring unit 102 communicates with the first abrasive extrusion port 411 and the second abrasive extrusion port 431 in a one-to-one correspondence.

[0063] In this embodiment of the invention, a fluid abrasive is extruded into the deburring unit 102 through the abrasive channel B using an abrasive lifting device 30. The fluid abrasive generates a fluid extrusion cutting force in the deburring space A to remove burrs from the intersecting holes 11 of the workpiece 10, achieving automated deburring of the intersecting holes 11 via fluid extrusion cutting. This method breaks through the traditional deburring process, eliminating manual labor and achieving automated processing. It not only effectively removes burrs but also improves the surface roughness of holes and other surfaces. It can be widely used in tooling accessories of different products and models with intersecting holes 11, and is especially suitable for parts with complex internal structures and high precision, such as micro-holes, irregularly shaped intersecting holes, and internally curved holes. While avoiding damage to the workpiece 10, the burrs are removed cleanly and the processing quality is high. Compared with traditional processing methods, the deburring method provided by this invention improves processing efficiency by more than 90%, ensuring the smooth progress of the production schedule and solving production bottlenecks.

[0064] The second embodiment of the present invention also provides a machining system for removing burrs from the intersecting holes 11 inside the workpiece 10. Please refer to [link to relevant documentation]. Figure 3 The system utilizes the processing method for removing burrs from the intersecting holes 11 within a workpiece 10 provided in the first embodiment of the present invention. The system includes a protective clamp assembly 20 and an abrasive drawing device 30. The protective clamp assembly 20 is used to assemble a burr processing unit 102 on the workpiece 10. The protective clamp assembly 20 includes a through-slot protection structure adapted to the through-slot. A burr processing space A is reserved between the through-slot protection structure and the intersecting hole 11. The through-slot protection structure is provided with an abrasive flow channel B, which communicates with the burr processing space A. Multiple burr processing units 102 are assembled in the abrasive drawing device 30. The abrasive drawing device 30 is used to extrude fluid abrasive through the abrasive flow channel B into the burr processing unit 102, so that the fluid abrasive generates a fluid extrusion cutting force in the burr processing space A to remove burrs.

[0065] The abrasive drawing device 30 includes a first material cylinder 31 and a second material cylinder 32 arranged opposite to each other. Fluid abrasive is placed in the first material cylinder 31 and / or the second material cylinder 32. The system also includes a device connecting fixture 40, which is used to assemble multiple burr processing units 102 between the first material cylinder 31 and the second material cylinder 32. The device connecting fixture 40 is provided with multiple abrasive extrusion channels that communicate with the first material cylinder 31 and the second material cylinder 32. The burr processing units 102 are assembled one-to-one in the abrasive extrusion channels, and the abrasive extrusion channels communicate with the abrasive flow channel B.

[0066] To make the present invention clearer, the third embodiment of the present invention combines the above two embodiments and the appendix. Figures 2 to 12When workpiece 10 is the cylinder body in the main body of the pump, an application example of deburring the cylinder body is introduced.

[0067] Based on the intersecting hole 11 of the cylinder body (which serves as workpiece 10) and the overall structural characteristics of the cylinder body, this embodiment of the invention designs a protective clamp assembly 20 and an equipment connection clamp 40. The cylinder body structure is as follows: Figure 2 As shown. The protective clamping assembly 20 protects key parts of the cylinder body, such as the smooth hole 12 and the threaded hole 13, and then connects it to the abrasive drawing device 30 via the device connecting clamp 40. Since the abrasive drawing device 30 provided in this embodiment is an existing mold clamping device, this embodiment of the invention... Figure 3 Only a simplified structural diagram of the abrasive pulling device 30 at the material cylinder processing position is shown. The fluid abrasive is bidirectionally pulled between the first material cylinder 31 and the second material cylinder 32 using a mold clamping device. The abrasive pulling device 30 (also commonly referred to as an abrasive flow device, mold clamping device, etc.) clamps multiple burr processing units 102, consisting of a protective clamping assembly 20 and a workpiece 10, between the first material cylinder 31 and the second material cylinder 32 at once. The mold clamping device performs a bidirectional pulling processing mode, removing a total of 20 burrs from both the front and back sides of the cylinder intersecting holes 11 under a set pressure abrasive extrusion cutting.

[0068] The cylinder body is made of aluminum bronze rod (QAl9-4). Its structural feature is that the part is mainly composed of holes. The main structure consists of 10 Φ6.5 (+0.004 / 0) mm smooth holes 12 distributed at 72° and 36° angles on both sides, and 10 sets of Φ8.2H9 one-way valve plug holes (i.e. threaded holes 13). Among them, the coaxial Φ8.2H9, (M8×0.5-6H), and Φ4H9 form one set. The light hole 12 and the one-way valve plug hole are distributed on different pitch circles. The light holes 12 on opposite faces are offset by 36°. The positional accuracy relative to the end face, outer circle and opposite light hole 12 is Φ0.1mm. The wall roughness of the Φ6.5 (+0.004 / 0) mm hole is required to be Ra0.2. The sealing step surface 131 of the (M8×0.5-6H) thread base hole is required to have a roughness of Ra0.2 and a flatness of 0.005mm. The positional accuracy and dimensional accuracy requirements are very high. The two ends are intersecting and connected to each other. Therefore, a large number of machining burrs will be generated at the intersection during the processing, which are not easy to remove and directly affect the performance of the entire product.

[0069] Based on the above analysis of the structural characteristics of the cylinder body, and considering the high requirements for the size and positional accuracy of the cylinder body's bores and the surface roughness, a protective clamp assembly 20 and an equipment connection clamp 40 were designed. The purpose of these two clamps is to ensure that the removal of burrs does not affect the accuracy requirements of the parts and the performance of the product.

[0070] I. Design of Protective Clamp Assembly 20:

[0071] The protective clamp assembly 20 includes a cover plate protector and a threaded protective plug 23. The cover plate protector includes an end face protector 21 and a cylindrical hole protector 22 disposed on the end face protector 21. The end face protector 21 protects the end faces of the front and rear ends of the cylinder from damage by abrasives. The hole protector 22 protects the Φ6.5mm hole of the cylinder. The threaded protective plug 23 protects the M8 threaded hole.

[0072] The threaded structure on the outside of the threaded protective plug 23 is adapted to the threaded hole 13. The threaded protective plug 23 is screwed into the threaded hole 13. A burr processing space A is reserved between the threaded protective plug 23 and the intersecting hole 11. The threaded protective plug 23 is provided with an abrasive flow channel B that communicates with the burr processing space A.

[0073] The aperture protection plug 22 is inserted into the aperture 12 of the cylinder with a size of Φ6.5 mm. A burr processing space A is reserved between the aperture protection plug 22 and the intersecting hole 11 of the cylinder. The aperture protection plug 22 is provided with an abrasive flow channel B that communicates with the burr processing space A.

[0074] Multiple abrasive inlets 211 are reserved on the end face protective cover 21. The abrasive inlets 211 are correspondingly set and connected to the abrasive flow channels B of the thread protection plug 23 and the light hole protection plug 22, so that the mold clamping equipment can squeeze the fluid abrasive from the abrasive inlets 211 and the abrasive flow channels B into the burr processing unit 102, so that the fluid abrasive generates a fluid extrusion cutting force to remove burrs in the burr processing space A.

[0075] (1) Material selection for manufacturing protective clamp assembly 20: Considering that the cylinder body part itself is made of aluminum bronze, in order to avoid damage to the cylinder body caused by the use of metal materials, the thread protection plug 23, end face protection cover 21 and aperture protection plug 22 in this embodiment of the invention can be made of polytetrafluoroethylene, rubber rod, aluminum rod and other materials. After repeated processing tests, processing effect evaluation and clamp durability consideration of different materials, this embodiment of the invention selected non-metallic polysulfone rod as the main material to manufacture protective clamp assembly 20.

[0076] (2) Arrangement of abrasive flow channels and setting of installation gap 24 with the reserved holes:

[0077] The arrangement of the abrasive channels is crucial for the deburring effect of workpiece 10, ensuring both the quality of the cylinder block machining and the precision of the part machining. This channel arrangement involved extensive experimentation with different arrangements before finalization. The abrasive channel layout is as follows: Figure 6 As shown.

[0078] Installation gap 24 setting: Considering the complex structure and high precision of the cylinder part, to facilitate operation and avoid damaging the precision of the cylinder, the threaded protective plug 23 and the smooth hole protective plug 22 need to maintain a certain distance 24 from the corresponding mounting hole to avoid damage to the hole wall during machining, insertion / removal of the end face protective cover 21, and tightening of the threaded protective plug 23. Conversely, if machining is performed with a smaller installation gap 24 or no installation gap 24, because this process method belongs to fluid extrusion cutting, the abrasive will enter the gap between the protective clamp assembly 20 and the hole wall of the part under pressure. During machining and insertion / removal of the end face protective cover 21, the abrasive entering the installation gap 24 will damage the Φ6.5 mm hole wall and the M8 threaded hole bottom sealing step surface 131. The former has a Φ6.5 mm hole dimensional accuracy of 0.004 mm and a roughness Ra0.2, while the latter has an M8 threaded hole bottom sealing step surface 131 flatness of 0.005 mm and a roughness Ra0.2.

[0079] like Figure 6 As shown, when a certain distance of installation gap 24 is reserved, when the reserved installation gap 24 is filled with abrasive, the spacing of the installation gap 24 should be designed so that the abrasive will not be squeezed and flowed in the reserved installation gap 24. No flow will not affect the critical position of the workpiece 10. This characteristic was obtained through repeated tests. After the hole protection plug 22 on the upper and lower end face protective cover 21 is inserted into the hole, it is 0.5mm away from the Φ6.5 mm hole wall on one side radially. The bottom surface of the hole protection plug 22 should be left with a burr processing space A from the bottom of the hole 12. After the thread protection plug 23 is screwed into the M8 threaded hole, the bottom surface of the thread protection plug 23 should be 0.1mm away from the sealing step surface 131 at the bottom of the hole.

[0080] II. Design of Equipment Connection Fixture 40:

[0081] (1) The equipment connection fixture 40 consists of a first connecting plate 41 (a non-metallic protective pad for protecting parts is provided on the first connecting plate 41) for connecting the first material cylinder 31, a protective support sleeve 42 for protecting the four cylinder bodies, and a second connecting plate 43 for connecting the second material cylinder 32.

[0082] (2) Material selection for equipment connection fixture 40: Considering the material of the parts, the installation mode and the rigidity requirements, the first connecting plate 41 is made of No. 45 steel. The part protection support sleeve 42 is made of No. 45 steel. The second connecting plate 43 can be made of aluminum plate.

[0083] The steps for removing burrs from the cylinder block intersecting hole 11 in this embodiment of the invention are as follows:

[0084] 1. Assembly and connection of the parts protection fixture assembly 20: The threaded protective plug 23 is screwed into the M8 threaded hole of the cylinder body. The upper and lower end face protective covers 21, which are fixedly connected to the smooth hole protective plug 22, are inserted into the Φ6.5 (+0.004 / 0) mm hole. The two end face protective covers 21 are respectively fitted to the front and back of the cylinder body. Based on the hollow structure of the cylinder body, the threaded hole in the middle of the end face protective cover 21 is used to connect and lock the two end face protective covers 21 to both ends of the cylinder body through long screws to form the burr processing unit 102. The installation structure of the burr processing unit 102 is as follows: Figure 5 As shown.

[0085] 2. The first connecting plate 41 of the equipment connecting fixture 40 is placed on the rotating tray of the existing mold clamping equipment. The cylinder with the protective fixture assembly 20 is clamped on the first connecting plate 41. The part protection support sleeve 42 is installed, and the second connecting plate 43 is connected. The rotating tray is then moved to the processing position of the mold clamping equipment. Installation is as follows: Figure 3 As shown.

[0086] 3. Abrasive Preparation and Mixing: The abrasive is confirmed according to different materials. Abrasive media may include silicon carbide, boron carbide, diamond powder, etc. One abrasive media is selected from these, and the selection is based on the different materials and structural characteristics of the parts. In this embodiment of the invention, based on the structural characteristics of the cylinder and the effect test, an abrasive containing 200-mesh silicon carbide cutting media is selected. The cutting media is determined through repeated tests.

[0087] 4. Abrasive preparation: The main components of abrasive are: polymer carrier, abrasive medium, lubricating oil, and softener. The ratio of these four components determines the hardness and cutting performance of the abrasive. Based on the desired removal effect, the polymer carrier, abrasive medium, lubricating oil, and softener are mixed and prepared to form a fluid abrasive, ensuring the machining accuracy and quality of the parts.

[0088] 6. Working Principle Explanation: Utilizing the rheological properties of abrasives, this method addresses parts with complex internal structures such as micropores, intersecting irregular holes, and internally curved holes. Under controlled pressure, the abrasive undergoes a bidirectional pulling motion between the first and second cylinders 32 of the clamping device, repeatedly pressing and cutting the workpiece to remove burrs. This solves the bottleneck problems of burr removal and polishing that traditional processing methods cannot address. It ensures the cylinder meets product usage requirements, achieving automated processing without manual intervention.

[0089] The deburring operation is described as follows: The cylinder with protective clamp assembly 20 is mounted on the first connecting plate 41 of the equipment connecting clamp 40. After the part protective support sleeve 42 is installed and the deburring unit 102 is assembled, the second connecting plate 43 is connected above the deburring unit 102. The rotating hand-held tray is connected between the first material cylinder 31 and the second material cylinder 32 of the mold clamping device. The second material cylinder 32 closes the mold. According to the set parameters such as pressure (including mold closing pressure and cutting pressure), time, and polishing times of the mold clamping device, the process is automatically started to automate the processing of the part. The deburring operation is described as follows: Figure 10 As shown.

[0090] Regarding the setting of processing parameters for the mold clamping equipment, in order to achieve a stable processing level and ensure that burrs are removed cleanly without damaging the protective tooling and key parts, the processing parameters for the mold clamping equipment are set as follows after repeated verification: mold clamping pressure is 900 bar, cutting pressure is 80 bar, polishing time is 8 minutes, and polishing times are 2.

[0091] This invention utilizes a flowing abrasive deburring process, employing a fluid extrusion cutting device and specialized tooling for processing. This eliminates manual labor, improving processing efficiency and ensuring quality. The before-and-after processing results are clearly demonstrated. The structural states of the cylinder block's intersecting hole 11 before and after deburring are shown below. Figure 11 and Figure 12 As shown.

[0092] As can be seen, the embodiments of the present invention provide a processing method and fixture design for removing burrs from intersecting holes 11, solving the production bottleneck of parts such as cylinder blocks with intersecting holes 11. This eliminates manual labor and enables automated processing, effectively removing burrs and improving the surface roughness of holes and other surfaces. Compared with traditional burr processing methods, processing efficiency is increased by 90%, and it can be applied to other different product models, especially parts with complex internal structures and high precision, such as micro-holes, irregularly shaped intersecting holes, and internally curved holes. It reduces labor costs and labor intensity. While avoiding scratches on parts, it removes burrs cleanly, ensuring good part processing quality.

[0093] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0094] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0095] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A machining method for removing burrs from intersecting holes in a workpiece, characterized in that, The workpiece (10) has a plurality of intersecting holes (11), and each intersecting hole (11) has a through groove at both ends that passes through the workpiece (10). The method includes: The prefabricated protective fixture assembly (20) is assembled on the workpiece (10) to form a burr processing unit (102). The protective fixture assembly (20) includes a through groove protection structure adapted to the through groove. A burr processing space (A) is reserved between the through groove protection structure and the intersecting hole (11). The through groove protection structure is provided with an abrasive flow channel (B). The abrasive flow channel (B) is connected to the burr processing space (A). Multiple deburring units (102) are assembled in an abrasive drawing device (30). The abrasive drawing device (30) is used to extrude fluid abrasive through the abrasive channel (B) into the deburring unit (102) so that the fluid abrasive generates a fluid extrusion cutting force to remove burrs in the deburring space (A). The through slot includes threaded holes (13) located at both ends of the intersecting hole (11), and the through slot protection structure includes: A threaded protective plug (23) is used to be screwed into the threaded hole (13). A burr processing space (A) is reserved between the threaded protective plug (23) and the intersecting hole (11). The threaded protective plug (23) is provided with an abrasive flow channel (B) that communicates with the burr processing space (A). The threaded protective plug (23) and the sealing step surface (131) at the bottom of the threaded hole (13) have an installation gap (24) of 0.1 mm. The through slot also includes light holes (12) located at both ends of the intersecting hole (11), and the through slot protection structure also includes: A light hole protection plug (22) is inserted into the light hole (12). A burr processing space (A) is reserved between the light hole protection plug (22) and the intersecting hole (11). The light hole protection plug (22) is provided with an abrasive flow channel (B) that communicates with the burr processing space (A). A 0.5mm installation gap (24) is left between the light hole protective plug (22) and the inner wall of the light hole (12).

2. The machining method for removing burrs from intersecting holes in a workpiece as described in claim 1, characterized in that, The protective clamp assembly (20) also includes: The end face protection cover (21) has multiple abrasive inlets (211) reserved on it. The abrasive inlets (211) are corresponding to and connected to the abrasive flow channel (B).

3. The machining method for removing burrs from intersecting holes in a workpiece as described in claim 1, characterized in that, The abrasive drawing device (30) includes a first material cylinder (31) and a second material cylinder (32) arranged opposite to each other, and the fluid abrasive is placed in the first material cylinder (31) and / or the second material cylinder (32); the step of assembling a plurality of the deburring units (102) in the abrasive drawing device (30) and using the abrasive drawing device (30) to extrude the fluid abrasive through the abrasive channel (B) into the deburring unit (102) so that the fluid abrasive generates a fluid extrusion cutting force for deburring in the deburring space (A) includes: Multiple deburring units (102) are assembled between the first material cylinder (31) and the second material cylinder (32). During the bidirectional lifting motion of the fluid abrasive between the first material cylinder (31) and the second material cylinder (32) using the abrasive lifting device (30), the fluid abrasive is squeezed into the deburring unit (102) through the abrasive channel (B) so that the fluid abrasive generates a fluid extrusion cutting force to remove burrs in the deburring space (A).

4. The machining method for removing burrs from intersecting holes in a workpiece as described in claim 3, characterized in that, The step of assembling multiple deburring units (102) in an abrasive drawing device (30), and using the abrasive drawing device (30) to extrude fluid abrasive through the abrasive channel (B) into the deburring unit (102) so that the fluid abrasive generates a fluid extrusion cutting force for deburring in the deburring space (A) further includes: Multiple deburring units (102) are assembled between the first material cylinder (31) and the second material cylinder (32) using a prefabricated equipment connecting fixture (40); During the bidirectional lifting motion of the fluid abrasive between the first material cylinder (31) and the second material cylinder (32), the fluid abrasive is squeezed into the burr processing space (A) through the abrasive flow channel (B) on each of the burr processing units (102), and a fluid extrusion cutting force for removing burrs is generated in the burr processing space (A).

5. The machining method for removing burrs from intersecting holes in a workpiece as described in claim 4, characterized in that, The device connection clamp (40) includes: The first connecting plate (41) is provided with a plurality of first abrasive extrusion ports (411) that communicate with the first material cylinder (31). A protective support sleeve (42) is fixed on the first connecting plate (41). The protective support sleeve (42) is provided with an assembly space (421) that is adapted to the outer periphery of the burr processing unit (102). The burr processing unit (102) is assembled in the assembly space (421). The second connecting plate (43) is provided with a plurality of second abrasive extrusion ports (431) that communicate with the second material cylinder (32). The abrasive channel (B) on the deburring unit (102) is connected to the first abrasive extrusion port (411) and the second abrasive extrusion port (431) in a one-to-one correspondence.

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