A tool for polishing and drawing cross-hatched patterns on the inner wall of a hole and a honing machine thereof

Abstract

The application discloses a cutter for polishing and drawing cross net patterns on the inner hole wall, which is often used in the honing process field. The cutter comprises a connecting shaft, a spring in a compressed state being sleeved on the connecting shaft, and articulated rods, the articulated rods being articulated on the connecting shaft, the top of the articulated rods being below the spring, and the bottom of the articulated rods being articulated with honing oil stones; wherein, a plurality of the articulated rods are arranged along the circumference of the connecting shaft, and each articulated rod rotates along the respective articulated point under the pressure of the spring, so that the honing oil stone at the bottom of the articulated rod is always in a tension state. The application utilizes the compression force of the spring to ensure that the honing oil stone is always in contact with the inner surface of the workpiece, and the application can be directly used on a multi-axis honing machine, and reasonable processing procedures are matched, so that the net pattern with the required angle can be drawn on the hole wall after honing, thereby realizing the generation of the net pattern surface similar to the traditional honing process on the honing machine.

Description

Technical Field

[0001] This invention belongs to the field of honing technology for internal hole texture patterns, and more specifically, relates to a tool for polishing and creating cross-patterned textures on the inner hole wall, and a honing machine thereof. Background Technology

[0002] Traditional honing is a finishing process that uses honing tools to polish the surface of a workpiece. During honing, the workpiece is mounted on the honing machine table or in a special fixture, and the honing tool is inserted into a pre-machined hole. The machine spindle drives the honing tool to rotate and reciprocate axially. The honing strips on the tool contact the wall of the hole under pressure, removing a very thin layer of metal and achieving a finishing process for the inner hole. Simultaneously, the honing process produces a cross-hatched surface. This cross-hatched pattern helps retain lubricating oil, effectively improving the service life of sliding moving parts and the smoothness of their movement. Therefore, the cross-hatched pattern is crucial for the performance of precision parts.

[0003] Honing, however, is different. Honing uses a honing tool for unidirectional grinding. Due to the low reciprocating speed and high rotational speed of honing, it often only produces unidirectional helical patterns. These patterns are not conducive to oil retention and are detrimental to product performance. In practice, honing is often performed first, and then the part is transferred to a traditional reciprocating honing machine to achieve the desired texture. This requires transferring the workpiece between different machines, which is quite cumbersome. Furthermore, to ensure the machining accuracy of the workpiece, it needs to be repositioned during the honing process, further increasing the complexity of the process and hindering production efficiency.

[0004] A search revealed Chinese Patent Application No. CN 203317197 U, which discloses a dual-angle honing mesh honing device. This application includes a honing mechanism mounted on a frame; a sprocket and chain rotating pair driven by a first servo motor is horizontally mounted on the frame; the driven sprocket of the sprocket and chain rotating pair is connected to a hollow main shaft vertically mounted on the frame; a column and guide rail are vertically mounted on the frame; a support transmission arm is horizontally mounted above the chain, one end of which is dynamically connected to the guide rail on the column, and the other end is connected to the hollow main shaft via a bearing; a ball screw driven by a second servo motor is vertically downward mounted above the support transmission arm, and a nut threaded with the ball screw is fixed on the support transmission arm; a hollow coarse expansion rod is fitted with a gap inside the hollow main shaft, and a fine expansion rod is fitted with a gap inside the coarse expansion rod; the upper ends of the coarse and fine expansion rods are connected to a dual-feed device, and the lower ends are connected to the coarse and fine expansion mandrels of the dual-expansion honing head. While this application can machine honing patterns at two angles within cylinder-type workpieces to improve lubrication between the cylinder and piston, it has not effectively solved the problem of low production efficiency caused by the need to switch workstations during honing of the inner bore and honing of the pattern.

[0005] For example, Chinese patent application CN 217413591 U discloses a multi-axis sequential integrated honing machine tool for honing cross-hatching. This application includes a machine tool bed, with a multi-axis headstock on one side of the bed. The headstock has multi-spindle output functionality. It also includes a multi-station rotary table, located on one side of the machine tool bed, used for indexing control of each step in sequential honing + honing or brushing + honing processes to achieve geometric accuracy correction or honing texture. Finally, it includes a honing spindle reciprocating and feed mechanism, located on one side of the machine tool bed, which automatically controls the honing head via an external hydraulic system, providing high-frequency reciprocating and hydraulic feed control. This provides the advantages of multi-axis sequential honing equipment and improved processing efficiency. This application organically combines honing the inner hole and honing texture in the same machine, effectively improving production efficiency. However, the honing head in this application needs to be connected to an additional feed mechanism and an expansion mechanism, which requires significant modifications to the original multi-axis honing machine. Summary of the Invention

[0006] 1. The problem to be solved

[0007] To address at least some of the problems existing in the prior art, this invention proposes a tool for polishing and creating cross-hatching on the inner wall of a hole. The purpose is to solve the problem that the existing inner hole honing process cannot directly produce cross-hatching, but requires the honed inner hole to be put into a traditional honing machine for secondary honing, resulting in poor production continuity and hindering the improvement of production efficiency.

[0008] 2. Technical Solution

[0009] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0010] The present invention provides a polishing tool for creating a cross-hatched pattern on the inner wall of a borehole, comprising:

[0011] A connecting shaft, on which a spring in a compressed state is sleeved;

[0012] A hinge rod is hinged to a connecting shaft, with its top located below the spring and its bottom hinged to a honing stone.

[0013] The hinge rods are arranged in multiple circumferential directions along the connecting shaft, and each hinge rod rotates along its respective hinge point under the pressure of the spring, so that the honing stone at its bottom is always in a tensioned state.

[0014] Furthermore, the connecting shaft includes a threaded section, a smooth section, and a connecting disc; wherein, the threaded section is provided with an adjusting nut for limiting the top of the spring; the hinge rod is hinged to the connecting disc.

[0015] Furthermore, the connecting plate is provided with a clearance groove for the hinge rod to be inserted and a mounting hole for the pin shaft to pass through; wherein, the clearance groove is perpendicular to the mounting hole and divides the mounting hole into two sections.

[0016] Furthermore, the hinge rod has a hook head located between the spring and the connecting plate, and the contact surfaces of the hook head with the spring and the connecting plate are each provided with a boss.

[0017] Furthermore, the honing stone includes a honing stone seat hinged to the hinge rod, the honing stone seat having a first mounting groove for accommodating the honing stone strip, and a second mounting groove for the edge of the hinge rod to be engaged.

[0018] Furthermore, the hinge rod has a first inclined surface on both sides of its bottom.

[0019] Furthermore, a second inclined surface is provided at the bottom of the inner side of the oilstone base; a third inclined surface is provided at the bottom of the honing surface of the oilstone strip.

[0020] Furthermore, the upper part of the threaded section is a connecting section, and the connecting section is provided with a positioning surface for connecting the drive shaft.

[0021] Furthermore, the spring is a disc spring or a rectangular spring, and the hinge rod is a hard manganese steel plate.

[0022] The present invention also provides a honing machine, including a honing machine body and a multi-station rotary table. The honing machine body is connected to a honing head and a honing head via a drive shaft thereon. The honing head is a tool used for polishing and creating a cross-hatching pattern on the inner wall of a bore.

[0023] 3. Beneficial effects

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] (1) The present invention provides a polishing tool for creating a cross-hatching pattern on the inner wall of a hole. A spring presses against the upper end of a hinge rod, forcing the honing stone at the bottom of the hinge rod to remain open, thus ensuring the honing stone is always in contact with the inner surface of the workpiece. This tool eliminates the need for an additional feed mechanism and can be directly mounted on the drive shaft of an existing multi-axis honing machine. It allows for the honing of inner holes and the creation of cross-hatching patterns on the same machine without requiring modifications to existing equipment. This improves production efficiency without increasing investment in production equipment.

[0026] (2) The present invention provides a tool for polishing and drawing cross-shaped patterns on the inner wall of a hole. The tool has a threaded section on the connecting shaft and an adjusting nut. The adjusting nut can adjust the clamping force of the spring, thereby changing the extrusion force between the honing stone and the inner wall of the workpiece, so as to be suitable for processing operations with different depths of cross-shaped patterns.

[0027] (3) A polishing and cross-patterning tool for drawing a cross pattern on the inner hole wall of the present invention, wherein the bottom of the hinge rod is provided with a first inclined surface on both sides, wherein the setting of the outer first inclined surface makes a certain gap between the inner wall of the second mounting groove of the oilstone seat and the first inclined surface, so as to facilitate the shrinkage operation of the end of the oilstone seat; while the setting of the first inclined surface on the inner side wall is to expand the gap between the ends of the two hinge rods and prevent the ends of the two hinge rods from interfering with each other during the shrinkage process.

[0028] (4) A polishing tool for creating a cross-pattern on the inner wall of a hole according to the present invention, wherein the bottom of the honing surface of the oilstone strip is provided with a third inclined surface, which can play a certain guiding role when the oilstone strip is inserted into the inner hole of the workpiece. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of a tool for polishing and drawing cross-shaped patterns on the inner wall of a hole according to the present invention;

[0030] Figure 2 This is a schematic diagram of the connecting shaft in this invention;

[0031] Figure 3 This is a schematic diagram of the connecting disk in the present invention;

[0032] Figure 4 This is a schematic diagram of the assembly between the connecting disc and the hinge rod in this invention;

[0033] Figure 5 This is a schematic diagram of the hinge rod in this invention;

[0034] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle;

[0035] Figure 7 This is a schematic diagram of the structure of the oilstone base in this invention;

[0036] Figure 8 This is a top view of the oilstone base in this invention;

[0037] Figure 9 This is a schematic diagram of the assembly of the honing stone in this invention;

[0038] Figure 10 This is a partially enlarged schematic diagram of the connection between the honing stone and the hinge rod in this invention;

[0039] Figure 11 This is a schematic diagram of the working state of the internal hole textured cutting tool of the present invention;

[0040] Figure 12 This is a schematic diagram showing the fit between the internal hole textured cutting tool and the workpiece of the present invention.

[0041] In the diagram: 1. Connecting shaft; 11. Connecting section; 111. Positioning surface; 12. Threaded section; 13. Smooth section; 14. Connecting disc; 141. Clearance groove; 142. Mounting hole;

[0042] 2. Spring; 3. Hinge rod; 31. Hook; 32. Boss; 33. First hinge hole; 34. Second hinge hole; 35. First inclined plane;

[0043] 4. Honing stone; 41. Honing stone base; 411. First mounting groove; 412. Second mounting groove; 413. Second inclined surface; 42. Honing stone strip; 421. Third inclined surface;

[0044] 5. Adjusting nut; 6. Pin; 7. Workpiece. Detailed Implementation

[0045] The present invention will be further described below with reference to specific embodiments.

[0046] Example 1

[0047] like Figure 1 As shown, this embodiment of a polishing and cross-hatching tool for creating a cross-hatching pattern on the inner wall of a hole includes a connecting shaft 1, a spring 2, and a hinge rod 3. The spring 2 is sleeved on the connecting shaft 1 and is used to press the top of the hinge rod 3. The hinge rod 3 is hinged to the connecting shaft 1, with its top located below the spring 2 and its bottom hinged to a honing stone 4.

[0048] Among them, multiple hinge rods 3 are arranged circumferentially along the connecting shaft 1, and the top of each hinge rod 3 rotates along its respective hinge point under the pressure of the spring 2, and is in a state of inward contraction, thereby causing the bottom of the hinge rod 3 to be in a state of outward expansion; thus driving the honing stone 4 on it to also be in an expanded state.

[0049] Specifically, refer to Figure 2 As shown, the connecting shaft 1 includes, from top to bottom, a connecting section 11, a threaded section 12, a smooth section 13, and a connecting disc 14.

[0050] The connecting section 11 has a positioning surface 111 machined on it for connecting the drive shaft. During installation, simply insert the end of the connecting section 11 into the mounting cavity of the drive shaft and tighten it against the positioning surface 111 with bolts to complete the assembly operation of the connecting shaft 1.

[0051] The threaded section 12 is equipped with an adjusting nut 5, which limits the top of the spring 2 to ensure it is always compressed. Simultaneously, by adjusting the position of the adjusting nut 5, the compression of the spring 2 can be changed, thereby altering the clamping force exerted by the spring 2 on the top of the hinge rod 3, and consequently changing the extrusion force between the honing stone 4 and the inner wall of the workpiece 7, thus adapting to processing operations with different depths of texture.

[0052] like Figure 3 , Figure 4 As shown, the connecting plate 14 is cylindrical in shape. The connecting plate 14 has a relief groove 141 for the hinge rod 3 to be inserted into, and a mounting hole 142 for the pin shaft 6 to pass through.

[0053] The clearance groove 141 is opened in a direction perpendicular to the mounting hole 142, and the clearance groove 141 divides the mounting hole 142 into two sections.

[0054] During assembly, the hinge rod 3 is first inserted into the clearance groove 141, and then the hinge connection between the hinge rod 3 and the connecting plate 14 can be completed by the pin 6. Of course, the honing stone 4 and the hinge rod 3 can also be hinged by the pin 6.

[0055] Preferably, the hinge rod 3 is made of hard manganese steel plate, and two are symmetrically arranged. The spring 2 is a disc spring or a rectangular spring, and the upper and lower ends of the spring 2 are provided with washers.

[0056] The working principle of the polishing and cross-patterning tool for creating a cross-pattern on the inner wall of a hole in this embodiment is as follows:

[0057] refer to Figure 11 , Figure 12 As shown, during use, the lower end of the hinge rod 3 is compressed inward by external force, causing the honing stone 4 on it to retract inward. Then, the honing stone 4 is inserted into the inner hole of the workpiece 7. Then, the external force is removed, and the spring 2 applies a squeezing force to the top of the hinge rod 3, forcing the bottom of the hinge rod 3 and the honing stone 4 on it to be in an open state, so that the honing stone 4 is always in contact with the inner surface of the workpiece 7.

[0058] This embodiment provides a tool for polishing and creating a cross-pattern on the inner wall of a hole. The pressure of the spring 2 ensures that the honing stone 4 remains in contact with the inner surface of the workpiece 7. No additional feeding mechanism is required, and it can be directly mounted on the drive shaft of an existing multi-axis honing machine. Thus, honing of the inner hole and honing of the cross-pattern can be performed on the same machine without changing the original equipment, improving production efficiency without increasing the investment in production equipment.

[0059] In addition, since the honing stone 4 is hinged to the hinge rod 3 and can always be in contact with the inner surface of the workpiece 7 under the pressure of the spring 2, it can be applied to some wire mesh drawing operations with tapered inner holes, greatly improving its applicability.

[0060] Example 2

[0061] This implementation is one embodiment of the hinge rod 3.

[0062] refer to Figure 5 , Figure 6 As shown, the hinge rod 3 has a hook head 31, which is confined between the spring 2 and the connecting plate 14, and the contact surfaces of the hook head 31 with the spring 2 and the connecting plate 14 are provided with a boss 32.

[0063] The hinge rod 3 has a first hinge hole 33 and a second hinge hole 34. The first hinge hole 33 is located near the hook head 31 and is used to hinge the connecting disc 14; the second hinge hole 34 is located near the bottom of the hinge rod 3 and is used to hinge the honing stone 4.

[0064] The tool for polishing and drawing cross-patterns on the inner wall of the hole in this embodiment can effectively prevent interference between the upper and lower surfaces of the hook head 31 and their respective contact surfaces during the expansion and contraction process of the end of the hinge rod 3 by providing bosses 32 on the upper and lower surfaces of the hook head 31, thereby affecting the smooth progress of the expansion and contraction action.

[0065] Additionally, refer to Figure 10 As shown, the bottom of the hinge rod 3 is provided with a first inclined surface 35 on both sides, so that the bottom of the hinge rod 3 has a trapezoidal structure that gradually narrows inward on both sides.

[0066] The outer first inclined surface 35 creates a certain gap between the oilstone base 41 and the first inclined surface 35 to facilitate the retraction operation of the end of the oilstone base 41; while the inner first inclined surface 35 is provided to widen the gap between the ends of the two hinge rods 3 to prevent the ends of the two hinge rods 3 from interfering with each other during the retraction process.

[0067] Example 3

[0068] This embodiment is one implementation of the honing stone 4.

[0069] refer to Figure 7 , Figure 8 , Figure 9 As shown, the honing stone 4 includes a stone base 41 and a first mounting groove 411 and a second mounting groove 412 formed on the stone base 41.

[0070] The first mounting groove 411 is equipped with an oilstone strip 42, and the grinding surface of the oilstone strip 42 must protrude from the surface of the oilstone base 41.

[0071] The edge of the hinge rod 3 is inserted into the second mounting groove 412, and then the hinge between the oilstone seat 41 and the hinge rod 3 is completed by the pin 6. The hinge point on the oilstone seat 41 is located at the upper center, so that the bottoms of the oilstone seat 41 will be close together in the natural state, so as to facilitate subsequent insertion into the inner hole of the inner workpiece 7.

[0072] refer to Figure 10 As shown, the bottom of the inner side of the oilstone base 41 is provided with a second inclined surface 413. The function of the second inclined surface 413 is the same as that of the first inclined surface 35 on the inner side wall of the hinge rod 3, which is to widen the gap between the ends of the two oilstone bases 41 and prevent the ends of the two oilstone bases 41 from interfering with each other when they come together.

[0073] In addition, to facilitate the insertion of the honing stone 42 into the inner hole of the workpiece 7, a third inclined surface 421 is provided at the bottom of the honing surface of the honing stone 42, which can play a certain guiding role when the honing stone 42 is inserted into the inner hole of the workpiece 7. Of course, to prevent the corners of the honing stone 42 from scratching the inner hole, the corners of the honing stone 42 that contact the inner hole are all rounded.

[0074] Example 4

[0075] This embodiment provides a honing machine, which includes a honing machine body and a multi-station rotary table. The honing machine body is connected to a honing head and a honing head via a drive shaft. The honing head is the tool used in the above embodiment for polishing and creating a cross-pattern on the inner wall of a bore.

[0076] Specifically, in this embodiment, the honing machine body is a 6-axis honing machine. Five drive axes are each connected to a corresponding honing head, performing sequential turning and grinding of the inner hole to improve its accuracy. The last drive axis is connected to an inner hole patterning tool to perform a honing patterning operation on the inner hole of the honed workpiece.

[0077] This embodiment of a honing machine, through technical improvements to polishing and drawing cross-patterned cutting tools on the inner hole wall, can be directly applied to existing 6-axis honing machines. With a reasonable machining program, it can draw the required angled pattern on the honing hole wall after honing, thereby producing a patterned surface similar to the traditional honing process on the honing machine. This improves production efficiency without increasing the investment in production equipment.

[0078] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A tool for polishing and creating a cross-hatched pattern on the inner wall of a borehole, characterized in that: include, A connecting shaft (1) is fitted with a spring (2) in a compressed state. The hinge rod (3) is hinged to the connecting shaft (1), with its top located below the spring (2) and its bottom hinged to a honing stone (4). Among them, there are multiple hinge rods (3) arranged around the circumference of the connecting shaft (1), and each hinge rod (3) rotates along its respective hinge point under the pressure of the spring (2), so that the honing stone (4) at its bottom is always in a tensioned state. The honing stone (4) includes a stone seat (41) hinged to the hinge rod (3). The hinge point between the stone seat (41) and the hinge rod (3) is located at the center of the stone seat (41) and above it, so that the bottoms of the stone seats (41) will come together in their natural state. The connecting shaft (1) includes a threaded section (12), a smooth section (13), and a connecting plate (14); wherein, the threaded section (12) is provided with an adjusting nut (5) for limiting the top of the spring (2); the hinge rod (3) is hinged to the connecting plate (14); The connecting plate (14) is provided with a relief groove (141) for the hinge rod (3) to be inserted, and a mounting hole (142) for the pin shaft (6) to pass through; wherein, the relief groove (141) is perpendicular to the mounting hole (142) and the relief groove (141) divides the mounting hole (142) into two sections; The hinge rod (3) has a hook (31) located between the spring (2) and the connecting plate (14), and the contact surfaces of the hook (31) with the spring (2) and the connecting plate (14) are provided with a boss (32). The hinge rod (3) has a first inclined surface (35) on both sides of its bottom.

2. The tool for polishing and creating a cross-hatching pattern on the inner wall of a hole according to claim 1, characterized in that: The oilstone base (41) is provided with a first mounting groove (411) for accommodating the oilstone strip (42) and a second mounting groove (412) for the edge of the hinge rod (3) to be inserted.

3. The tool for polishing and creating a cross-hatching pattern on the inner wall of a hole according to claim 2, characterized in that: The bottom of the inner side of the oilstone base (41) is provided with a second inclined surface (413); the bottom of the honing surface of the oilstone strip (42) is provided with a third inclined surface (421).

4. The tool for polishing and creating a cross-hatching pattern on the inner wall of a hole according to claim 1, characterized in that: Above the threaded section (12) is a connecting section (11), and the connecting section (11) is provided with a positioning surface (111) for connecting the drive shaft.

5. The tool for polishing and creating a cross-hatching pattern on the inner wall of a hole according to claim 4, characterized in that: The spring (2) is a disc spring or a rectangular spring, and the hinge rod (3) is a hard manganese steel plate.

6. A honing machine, comprising a honing machine body and a multi-station rotary table, wherein, The honing machine body is connected to a honing head and a honing head via a drive shaft thereon, characterized in that: the honing head is a tool for polishing and drawing cross-patterns on the inner wall of a hole, as described in any one of claims 1-5.

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