Flexible honing tool for multiple spiral grooves

Abstract

The flexible honing tool for the multiple spiral grooves comprises a base body, an ejector rod capable of moving in the front-back direction relative to the base body, and a plurality of flexible honing strip assemblies capable of being pushed by the conical surface of the ejector rod so as to move and expand in the radial direction relative to the ejector rod. The flexible honing strip assembly comprises an expansion base, a floating base, a plurality of positioning beads arranged between the expansion base and the floating base, a honing stone arranged on the floating base and a limiting pin inserted between the expansion base and the floating base, the expansion base is matched with the conical surface, and the floating base is matched with the conical surface. One of the expansion base and the floating base is provided with a floating groove, at least one part of the other of the expansion base and the floating base is arranged in the floating groove, and the positioning ball is used for providing floating of the floating base relative to the expansion base in the left-right direction. And the limiting pin is used for preventing the expansion base from being separated from the floating base.

Description

Technical Field

[0001] The invention relates to the field of mechanical processing, and in particular to a flexible honing tool for multiple spiral grooves. Background Art

[0002] In the field of mechanical processing, honing is generally used for processing the inner holes of workpieces. Some of the workpieces are deep-hole parts whose inner circumferences need to be provided with multiple spiral grooves. For the processing of these multiple spiral grooves, the grinding part of the existing honing tools is often fixed in a contoured manner. When honing the spiral grooves, it is impossible to ensure that all the spiral grooves are processed at the same time. When all the spiral grooves are processed, the spiral groove width often exceeds the tolerance. Therefore, how to design a honing tool that is easy to process and can ensure the honing accuracy of multiple spiral grooves is the goal pursued by technical personnel in this field. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a flexible honing tool for multiple spiral grooves.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] A flexible honing tool for multiple spiral grooves comprises: a base, a push rod movable in a front-to-rear direction relative to the base, and a plurality of flexible honing bar assemblies that can be pushed by a conical surface of the push rod to move radially and expand relative to the push rod, the flexible honing bar assembly comprising: an expansion base, a floating base, a plurality of positioning beads arranged between the expansion base and the floating base, a honing stone arranged on the floating base, and a limit pin inserted between the expansion base and the floating base, the expansion base cooperates with the conical surface, a floating groove is formed on one of the expansion base and the floating base, at least a portion of the other of the expansion base and the floating base is arranged in the floating groove, the positioning beads are used to provide the floating base with floating motion in a left-right direction relative to the expansion base, and the limit pin is used to prevent the expansion base from detaching from the floating base.

[0006] In one embodiment, the floating groove is formed on the expansion base, and the bottom of the floating base is disposed in the floating groove.

[0007] In one embodiment, a plurality of positioning beads are fixedly connected to the floating base and are equally arranged to protrude from the left and right sides of the floating base, and an arc-shaped groove for accommodating the beads of the positioning beads is provided in the floating groove.

[0008] In one embodiment, two positioning beads are protruding from the left and right sides of the floating base respectively. In the front-to-back direction of the floating base, the two positioning beads protruding from the left side of the floating base are staggered with the two positioning beads protruding from the right side of the floating base.

[0009] In one embodiment, the two positioning beads protruding from the left side of the floating base are arranged on one side of the floating base in the front-rear direction, and the two positioning beads protruding from the right side of the floating base are arranged on the other side of the floating base in the front-rear direction.

[0010] In one embodiment, the limiting pin is fixedly connected to the floating base, and the limiting pin is loosely fitted and plugged into the expansion base.

[0011] In one embodiment, a positioning member is further provided in the front-to-back direction of the bottom of the floating base, and the positioning member is used to limit the movement of the floating base in the front-to-back direction relative to the expansion base. The two positioning members are respectively fixedly connected to the expansion base, and the distance between the two positioning members in the front-to-back direction is greater than the length of the bottom of the floating base in the front-to-back direction.

[0012] In one embodiment, the width of the floating groove in the left and right directions is set to M, the width of the bottom of the floating base in the left and right directions is set to N, satisfying MN≥2*f, and / or the expansion and contraction amount h of the positioning bead in the left and right directions satisfies h>1.5f, where f is the processing tolerance value of the multi-spiral groove.

[0013] In one embodiment, the expansion base is provided with a curved surface that matches the conical surface.

[0014] In one embodiment, the base is further provided with a guide groove, at least a portion of the expansion base is disposed in the guide groove, and the guide groove is used to provide guidance for the flexible honing stick assembly when radially moving and expanding relative to the push rod.

[0015] In one embodiment, the expansion base is not arranged parallel to the axis of the push rod, and a plurality of expansion bases are arranged relatively parallel to each other.

[0016] In one embodiment, the flexible honing tool for multiple spiral grooves further includes a first elastic member, and the first elastic member is used to provide an elastic force to move the push rod back to an upright position relative to the base.

[0017] In one embodiment, the flexible honing tool for multiple spiral grooves further comprises a second elastic member, wherein the second elastic member is configured to provide an elastic force for causing the flexible honing stick assembly to move and contract radially relative to the push rod.

[0018] In one embodiment, the flexible honing tool for multiple spiral grooves further includes a limiting pin, and the limiting pin is configured to limit the push rod from moving further forward or further backward relative to the base.

[0019] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0020] The flexible honing tool of the present invention is specially designed for deep-hole workpieces with multiple spiral grooves. By providing a flexible honing bar assembly, the honing stone can float in the left and right directions of the flexible honing bar assembly. When not subjected to external force, the honing stone can be located in the middle position of the flexible honing bar assembly, ensuring that all spiral grooves can be processed during the processing process and that the width of the spiral grooves of the workpiece is within the tolerance range. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A top view of a deep hole workpiece with multiple spiral grooves for machining in one embodiment of the present invention;

[0022] Figure 2 is a schematic three-dimensional diagram of a flexible honing tool in one embodiment of the present invention;

[0023] Figure 3 is a side view of a flexible honing tool in one embodiment of the present invention;

[0024] Figure 4 for Figure 3 Cross-sectional view of the flexible honing tool along the AA direction;

[0025] Figure 5 is a schematic perspective view of a flexible honing stick assembly in one embodiment of the present invention;

[0026] Figure 6 is a front view of a flexible honing stick assembly in one embodiment of the present invention;

[0027] Figure 7 is a side view of a flexible honing stone assembly according to an embodiment of the present invention;

[0028] Figure 8 is an exploded view of a flexible honing stick assembly in one embodiment of the present invention;

[0029] Figure 9 is a three-dimensional schematic diagram of a positioning bead in one embodiment of the present invention;

[0030] Figure 10 is a front view of a positioning bead in one embodiment of the present invention;

[0031] Figure 11 for Figure 10 A cross-sectional view of the positioning bead along the BB direction;

[0032] In the picture:

[0033] 1-base; 11-honing head body; 12-middle section; 13-flange pressure rod seat; 14-first elastic member; 2-thrust rod; 21-thrust rod limiting portion; 22-vertebral body; 221-conical surface; 222-limiting groove; 23-thrust rod body; 3-flexible honing stick assembly; 31-expansion base; 311-floating groove; 312-arc groove; 313-arc surface; 32-floating base; 321-slotting; 33-honing stone; 34-locating bead; 341-locating bead body; 342-bead body; 343-elastic member; 35-limiting pin; 36-locating member; 5-second elastic member; H-spiral groove width; h-extension amount; 6-deep hole workpiece; 7-limiting pin; C-axis line. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0035] See also Figures 1 to 11 The flexible honing tool for multiple spiral grooves of the present invention includes a base 1, a push rod 2 that can move in the front-rear direction relative to the base 1, and a plurality of flexible honing bar assemblies 3 that can be pushed by the conical surface 221 of the push rod 2 to move radially and expand relative to the push rod 2.

[0036] In one embodiment, the base 1 includes a honing head body 11 arranged on the front side, a middle section 12 arranged in the middle, and a flange pressure rod seat 13 arranged on the rear side. The three are relatively fixed. The honing head body 11 is hollow and a first elastic member 14 is arranged therein.

[0037] In one embodiment, the push rod 2 includes a push rod limiting portion 21 arranged at the top, a vertebral body 22 arranged in the middle, and a push rod body 23 arranged at the tail, and the three are fixedly connected. The push rod limiting portion 21 is arranged in the honing head body 11, and the front side of the first elastic member 14 is abutted against the interior of the honing head body 11, and the rear side of the first elastic member 14 is abutted against the push rod limiting portion 21. The first elastic member 14 is used to provide an elastic force to make the push rod 2 move backward relative to the base 1 and return to the normal state. Specifically, in one embodiment, the first elastic member 14 can be a compression spring, and the push rod limiting portion 21 is also arranged to limit the push rod from moving further backward relative to the base to prevent the push rod limiting portion 21 from falling out of the honing head body 11. Specifically, the height of the push rod limiting portion 21 in the up and down direction is greater than the diameter of the opening opened on the rear side of the honing head body 11 for placing the push rod 2, so that the push rod limiting portion 21 can abut against the honing head body 11 to play a limiting role.

[0038] In one embodiment, the flexible honing tool of the present invention also includes a limit pin 7, which is configured to limit the push rod 2 from moving further forward or further backward relative to the base 1. Specifically, in one embodiment, a limit groove 222 is provided on the vertebral body 22 along the left and right directions. The limit pin 7 is fixedly connected to the base 1 and is arranged in the limit groove 222. When the push rod 2 is in the frontmost extreme position relative to the base 1, the limit pin 7 is against the rear side of the limit groove 222. When the push rod 2 is in the rearmost extreme position relative to the base 1, the limit pin 7 is against the front side of the limit groove 222.

[0039] The cone body 22 includes a conical surface 221 extending obliquely from front to back and outward, and a plurality of flexible honing stone assemblies 3 are circumferentially arranged around the conical surface 221 .

[0040] like Figure 5-8 As shown, the flexible honing stick assembly 3 includes an expansion base 31, a floating base 32, a plurality of positioning beads 34 arranged between the expansion base 31 and the floating base 32, a honing stone 33 arranged on the floating base 32, and a limiting pin 35 inserted between the expansion base 31 and the floating base 32.

[0041] The expansion base 31 is provided with an arcuate surface 313 that cooperates with the conical surface 221. In one embodiment, the arcuate surface 313 of the expansion base 31 extends outward from front to back, ensuring that the arcuate surface 313 is in contact with the conical surface 221 of the vertebral body 22. When the vertebral body 22 pushes the flexible honing stick assembly 3 to move radially relative to the push rod 2, the honing stone 33 can always be in contact with the bottom surface of the spiral groove of the deep hole workpiece 6. Figure 3 As shown, the expansion base 31 is not parallel to the axis C extending in the front-to-back direction of the mandrel 2, and the multiple expansion bases 31 are relatively parallel to each other, thereby fitting the spiral groove shape of the deep hole workpiece 6. The number of flexible honing stick assemblies 3 can be set according to actual conditions, such as Figure 1 As shown, the flexible honing tool of the present invention is suitable for this type of deep hole workpiece 6, which has 28 spiral grooves. The flexible honing tool of the present invention can be provided with 14 flexible honing bar assemblies 3, which can process 14 spiral grooves set at intervals on the deep hole workpiece 6 at a time, and then process another 14 spiral grooves after completion.

[0042] A floating groove 311 is provided on one of the expansion base 31 and the floating base 32, and at least a portion of the other of the expansion base 31 and the floating base 32 is arranged in the floating groove 311. The positioning beads 34 are used to provide the floating base 32 with floating in the left and right directions relative to the expansion base 31, and the limit pins 35 are used to prevent the expansion base 31 from detaching from the floating base 32.

[0043] In one embodiment, a floating groove 311 is formed on the expansion base 31, and the bottom of the floating base 32 is disposed in the floating groove 311. Specifically, the floating groove 311 is opened upward, and the floating base 32 is disposed above the expansion base 31.

[0044] like Figure 9-11 As shown, in one embodiment, the positioning bead 34 includes a positioning bead body 341, a spherical bead body 342, and an elastic member 343. An inner cavity is provided inside the positioning bead body 341, and a through hole connected to the outside is provided on one side of the length extension direction of the positioning bead body 341. The elastic member 343 is arranged in the inner cavity and respectively resists the positioning bead body 341 and the bead body 342. When the elastic member 343 is in a natural state, the bead body 342 is arranged in the through hole and protrudes outward relative to the through hole. When the bead body 342 is subjected to force, the elastic member 343 is compressed, and the bead body 342 can shrink relative to the through hole.

[0045] A plurality of positioning beads 34 are fixedly connected to the floating base 32 and are equally arranged to protrude from the left and right sides of the floating base 32 . An arc-shaped groove 312 for accommodating the beads 342 of the positioning beads 34 is provided in the floating groove 311 .

[0046] Specifically, the bottom of the floating base 32 is provided with slots extending in the left-right direction, the number of which is equal to the number of the positioning beads 34. Figure 8 As shown, there are four slots 321 and four positioning beads 34. The positioning beads 34 are fixed in the slots 321, with the beads 342 of two positioning beads 34 facing the left side of the floating slot 311, and the beads 342 of the other two positioning beads 34 facing the right side of the floating slot 311. In other embodiments, the number of positioning beads 34 can also be set to 6, 8, 10, etc. In the front-to-back direction of the floating base 32, the two positioning beads 34 protruding from the left side of the floating base 32 are staggered with the two positioning beads 34 protruding from the right side of the floating base 32. Specifically, the two positioning beads 34 protruding from the left side of the floating base 32 are arranged at the front side of the floating base in the front-to-back direction, and the two positioning beads protruding from the right side of the floating base 32 are arranged at the rear side of the floating base in the front-to-back direction. By protruding two positioning beads 34 on the left and right sides of the floating base 32, it is ensured that the floating base 34 can always remain parallel to the side walls of the floating groove 311 when no force is applied. When using this flexible honing tool, the honing stone 33 can always remain parallel to the side walls of the spiral groove when no external force is applied, thereby improving the honing accuracy.

[0047] To prevent the floating base 32 from separating from the expanded base 31 due to gravity or centrifugal force during the honing process, a limit pin 35 is further provided. The limit pin 35 extends in the left-right direction, is fixedly connected to the floating base 32, and is inserted with a clearance fit into the expanded base 31. Specifically, in one embodiment, both the expanded base 31 and the floating base 32 are provided with a pin hole for inserting the limit pin 35. To avoid affecting the left-right floating of the floating base 32, the limit pin 35 and the pin hole of the floating base 32 have an interference fit. In one embodiment, the interference fit is 1-2 threads (0.01-0.02mm). The limit pin 35 and the expanded base 31 have a clearance fit. In one embodiment, the clearance is 6-8 threads (0.06-0.08mm).

[0048] A positioning member 36 is further provided in the front-to-back direction of the bottom of the floating base 32. The positioning member 36 is used to limit the front-to-back movement of the floating base 32 relative to the expansion base 31. The two positioning members 36 are respectively fixedly connected to the expansion base 31. The distance between the two positioning members 36 in the front-to-back direction is greater than the length of the bottom of the floating base 32 in the front-to-back direction. Through this arrangement, the floating base 32 is limited in the front-to-back direction while avoiding affecting the floating of the floating base 32 in the left and right directions. Specifically, in one embodiment, the distance between the two positioning members 36 in the front-to-back direction is 3-4 mm (0.03-0.04 mm) longer than the length of the bottom of the floating base 32 in the front-to-back direction.

[0049] In one embodiment, the flexible honing tool for multiple spiral grooves of the present invention further includes a second elastic member 5, which is used to provide an elastic force to cause the flexible honing stone assembly 3 to radially move and contract relative to the push rod 2. Specifically, the second elastic member 5 can be a tension spring, the number of which can correspond to the number of flexible honing stone assemblies 3. One end of the tension spring is connected to the middle section 12 of the base 1, and the other end of the tension spring is connected to the expansion base 31.

[0050] In one embodiment, the middle section 12 of the base 1 is provided with a guide groove (not shown in the figure), and at least a portion of the expansion base 31 is arranged in the guide groove. The number of the guide grooves corresponds to the number of the flexible honing stick assemblies 3. The guide grooves are used to provide guidance for the flexible honing stick assemblies when they move radially relative to the push rod 2 for expansion and contraction.

[0051] like Figure 1 As shown, the width of the spiral groove of the deep hole workpiece 6 is H, and its tolerance value is set to f. In order to meet the tolerance, the width of the floating groove 311 in the left and right directions is set to M, and the width of the bottom of the floating base 32 in the left and right directions is set to N, satisfying MN≥2*f, and the expansion and contraction amount h of the bead body 341 of the positioning bead 34 in the left and right directions satisfies h>1.5f.

[0052] The working principle of the flexible honing tool in one embodiment of the present invention is described below:

[0053] The flexible honing tool of the present invention is set in the deep hole workpiece 6 to be processed, and the push rod 2 is pushed from back to front, driving the vertebral body 22 to move from back to front. The conical surface 221 of the vertebral body 22 pushes the arc surface 313 of the expansion base 31, so that the flexible honing stick assembly 3 moves radially and expands relative to the push rod 2 along the guide groove, and then the honing stone 33 is fit with the spiral groove for honing. At this time, the first elastic member 14 is compressed and accumulates elastic force, and the second elastic member 5 is stretched and accumulates elastic force. When the force applied to the push rod 2 is removed, the push rod 2 moves from front to back due to the elastic force of the first elastic member 14, and the flexible honing stick assembly 3 moves radially and contracts relative to the push rod 2 due to the elastic force of the second elastic member 5.

[0054] In the description of the present invention, the directions such as "front", "back", "left", "right", "up", and "down" involved are all defined for reference for the convenience of description, that is, Figure 4 As shown, for the flexible honing tool, the left direction in the figure is "front", the right direction in the figure is "back", the upper direction in the figure is "up", the lower direction in the figure is "down", and the directions perpendicular to the viewing angle in the figure are "left" and "right", as shown in FIG. Figure 7 As shown, for the flexible honing stone assembly, the left direction in the figure is "front", the right direction in the figure is "back", the upper direction in the figure is "up", the lower direction in the figure is "down", and the directions perpendicular to the viewing angle in the figure are "left" and "right". The definitions of the above directions are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made in accordance with the spirit of the present invention are intended to be covered by the scope of protection of the present invention.

Claims

1. A flexible honing tool for multiple spiral grooves, characterized in that: include: A base, a push rod that can move in the front-to-rear direction relative to the base, and a plurality of flexible honing stick assemblies that can be pushed by the conical surface of the push rod to move radially and expand relative to the push rod, the flexible honing stick assembly including: an expansion base, a floating base, a plurality of positioning beads arranged between the expansion base and the floating base, a honing stone arranged on the floating base, and a limit pin inserted between the expansion base and the floating base, the expansion base cooperates with the conical surface, a floating groove is formed on one of the expansion base and the floating base, at least a portion of the other of the expansion base and the floating base is arranged in the floating groove, the positioning beads are used to provide the floating base with floating movement in the left-right direction relative to the expansion base, and the limit pin is used to prevent the expansion base from detaching from the floating base.

2. The flexible honing tool for multiple spiral grooves according to claim 1, characterized in that: The expansion base is provided with the floating groove, and the bottom of the floating base is arranged in the floating groove.

3. The flexible honing tool for multiple spiral grooves according to claim 1, characterized in that: A plurality of positioning beads are fixedly connected to the floating base and are equally protruded from the left and right sides of the floating base. An arc-shaped groove for accommodating the bead bodies of the positioning beads is provided in the floating groove.

4. The flexible honing tool for multiple spiral grooves according to claim 3, characterized in that: Two positioning beads are respectively protruded from the left and right sides of the floating base. In the front-to-back direction of the floating base, the two positioning beads protruded from the left side of the floating base are staggered with the two positioning beads protruded from the right side of the floating base.

5. The flexible honing tool for multiple spiral grooves according to claim 4, characterized in that: The two positioning beads protruding from the left side of the floating base are arranged on one side of the floating base in the front-rear direction, and the two positioning beads protruding from the right side of the floating base are arranged on the other side of the floating base in the front-rear direction.

6. The flexible honing tool for multiple spiral grooves according to claim 2, characterized in that: The limit pin is fixedly connected to the floating base, and the limit pin is plugged into the expansion base with clearance fit.

7. The flexible honing tool for multiple spiral grooves according to claim 2, characterized in that: A positioning member is also provided in the front-to-back direction of the bottom of the floating base, and the positioning member is used to limit the movement of the floating base in the front-to-back direction relative to the expansion base. The two positioning members are respectively fixedly connected to the expansion base, and the distance between the two positioning members in the front-to-back direction is greater than the length of the bottom of the floating base in the front-to-back direction.

8. The flexible honing tool for multiple spiral grooves according to claim 2, characterized in that: The width of the floating groove in the left and right directions is set to M, the width of the bottom of the floating base in the left and right directions is set to N, satisfying MN≥2*f, and / or the expansion and contraction amount h of the positioning bead in the left and right directions satisfies h>1.5f, where f is the processing tolerance value of the multi-spiral groove.

9. The flexible honing tool for multiple spiral grooves according to claim 1, characterized in that: The expansion base is provided with an arc surface matching the conical surface.

10. The flexible honing tool for multiple spiral grooves according to any one of claims 1 to 9, characterized in that: The base is further provided with a guide groove, in which at least a portion of the expansion base is disposed. The guide groove is used to provide guidance for the flexible honing stick assembly when it moves radially and expands relative to the push rod.

11. The flexible honing tool for multiple spiral grooves according to any one of claims 1 to 9, characterized in that: The expansion base is arranged non-parallel to the axis of the top rod, and a plurality of the expansion bases are arranged relatively parallel to each other.

12. The flexible honing tool for multiple spiral grooves according to any one of claims 1 to 9, characterized in that: The flexible honing tool for multiple spiral grooves further includes a first elastic member, which is used to provide an elastic force to move the push rod back to the center relative to the base.

13. The flexible honing tool for multiple spiral grooves according to any one of claims 1 to 9, characterized in that: The flexible honing tool for multiple spiral grooves further includes a second elastic member, which is used to provide an elastic force to cause the flexible honing stick assembly to move and contract radially relative to the push rod.

14. The flexible honing tool for multiple spiral grooves according to any one of claims 1 to 9, characterized in that: The flexible honing tool for multiple spiral grooves further includes a limiting pin, which is configured to limit the push rod from moving further forward or further backward relative to the base.

Images