A flexible honing tool for multiple helical grooves

Abstract

The present application relates to a kind of flexible honing tools for multiple spiral grooves, comprising: base, top rod movable in front-back direction relative to base, and multiple flexible honing strip assemblies can be pushed by the taper surface of the top rod to expand radially relative to the top rod, the flexible honing strip assembly comprises: expansion base, floating base, multiple positioning beads arranged between the expansion base and the floating base, honing stone arranged on the floating base, limiting pin inserted between the expansion base and the floating base, the expansion base cooperates with the taper surface, floating groove is opened in 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 bead is used to provide the left and right direction floating of the floating base relative to the expansion base, and the limiting pin is used to prevent the expansion base from being separated from the floating base.

Description

Technical Field

[0001] This invention relates to the field of machining, and more specifically to a flexible honing tool for multi-spiral grooves. Background Technology

[0002] In the field of machining, honing is generally used for machining the inner holes of workpieces. Some of these workpieces are deep-hole parts with multiple spiral grooves on their inner circumferential surface. For machining these multi-spiral grooves, the grinding part of existing honing tools is often fixed in a contour-following manner. When honing the spiral grooves, it is impossible to ensure that all spiral grooves are machined at the same time. When trying to ensure that all spiral grooves are machined, the groove width often exceeds the tolerance. Therefore, how to design a honing tool that is easy to machine and can ensure the honing accuracy of multi-spiral grooves is the goal pursued by those skilled in the art. Summary of the Invention

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

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A flexible honing tool for multi-spiral grooves includes: a base, a push rod movable relative to the base in a front-rear direction, and a plurality of flexible honing strip assemblies that can be pushed by a conical surface of the push rod to expand radially relative to the push rod. Each flexible honing strip assembly includes: an expansion base, a floating base, a plurality of positioning beads disposed between the expansion base and the floating base, a honing stone disposed on the floating base, and a limiting pin inserted between the expansion base and the floating base. The expansion base engages with the conical surface. One of the expansion base and the floating base has a floating groove, and at least a portion of the other of the expansion base and the floating base is disposed in the floating groove. The positioning beads provide lateral floating of the floating base relative to the expansion base, and the limiting pin prevents the expansion base from detaching from the floating base.

[0006] In one embodiment, the expansion base has the floating groove, 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 arranged in equal numbers protruding from the left and right sides of the floating base. The floating groove is provided with an arc-shaped groove for accommodating the beads.

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

[0009] In one embodiment, two positioning beads protruding from the left side of the floating base are disposed on one side of the floating base in the front-rear direction, and two positioning beads protruding from the right side of the floating base are disposed 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 inserted into the expansion base with a clearance fit.

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

[0012] In one embodiment, the width of the floating groove in the left-right direction is set as M, the width of the bottom of the floating base in the left-right direction is set as N, satisfying MN≥2*f, and / or the extension and retraction h of the positioning bead in the left-right direction satisfies h>1.5f, where f is the machining tolerance value of the multi-spiral groove.

[0013] In one embodiment, the expansion base is provided with an arcuate surface that mates with the conical surface.

[0014] In one embodiment, the substrate is further provided with a guide groove, in which at least a portion of the expansion base is disposed, the guide groove being used to provide guidance for the flexible honing strip assembly to expand radially relative to the push rod.

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

[0016] In one embodiment, the flexible honing tool for multi-helical grooves further includes a first elastic element for providing an elastic force that returns the push rod to its original position relative to the substrate.

[0017] In one embodiment, the flexible honing tool for multi-helical grooves further includes a second elastic element for providing an elastic force that causes the flexible honing strip assembly to retract radially relative to the push rod.

[0018] In one embodiment, the flexible honing tool for multi-spiral grooves further includes a limiting pin configured to restrict the push rod from moving further forward or further backward relative to the substrate.

[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 specifically designed for deep-hole workpieces with multiple spiral grooves. By setting up a flexible honing strip assembly, the honing stone can float in the left and right directions of the flexible honing strip assembly. When not subjected to external force, the honing stone can be in the middle position of the flexible honing strip assembly, ensuring that all spiral grooves can be machined during the processing, and also ensuring that the width of the spiral grooves of the workpiece is within the tolerance range. Attached Figure Description

[0021] Figure 1 This is a top view of a deep-hole workpiece with multiple spiral grooves for machining, according to an embodiment of the present invention.

[0022] Figure 2 This is a three-dimensional schematic diagram of a flexible honing tool according to an embodiment of the present invention;

[0023] Figure 3 This is a side view of a flexible honing tool according to an embodiment of the present invention;

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

[0025] Figure 5 This is a perspective view of a flexible honing strip assembly according to an embodiment of the present invention;

[0026] Figure 6 This is a front view of a flexible honing strip assembly according to an embodiment of the present invention;

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

[0028] Figure 8 This is an exploded view of a flexible honing strip assembly according to an embodiment of the present invention;

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

[0030] Figure 10 This is a front view of the 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 element; 2-Top rod; 21-Top rod limiting part; 22-Cone; 221-Conical surface; 222-Limiting groove; 23-Top rod body; 3-Flexible honing strip assembly; 31-Expansion base; 311-Floating groove; 312-Arc groove; 313-Arc surface; 32-Floating base; 321-Slotted; 33-Honing stone; 34-Positioning bead; 341-Positioning bead body; 342-Bead body; 343-Elastic element; 35-Limiting pin; 36-Positioning element; 5-Second elastic element; H-Helical groove width; h-Extension amount; 6-Deep hole workpiece; 7-Limiting pin; C-Axis. Detailed Implementation

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

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

[0036] In one embodiment, the base 1 includes a honing head body 11 disposed on the front side, a middle section 12 disposed in the middle, and a flange pressure rod seat 13 disposed on the rear side. The three are fixedly disposed relative to each other. The honing head body 11 is hollow and a first elastic element 14 is disposed inside it.

[0037] In one embodiment, the push rod 2 includes a push rod limiting part 21 disposed at the top, a cone body 22 disposed in the middle, and a push rod body 23 disposed at the tail, all three being fixedly connected. The push rod limiting part 21 is disposed in the honing head body 11. The front side of the first elastic member 14 abuts against the interior of the honing head body 11, and the rear side of the first elastic member 14 abuts against the push rod limiting part 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 center position. Specifically, in one embodiment, the first elastic member 14 can be a compression spring. The push rod limiting part 21 is also configured to limit the push rod from moving further backward relative to the base, preventing the push rod limiting part 21 from dislodging from the honing head body 11. Specifically, the height of the push rod limiting part 21 in the vertical direction is greater than the diameter of the opening in the honing head body 11 on the rear side for placing the push rod 2, so that the push rod limiting part 21 can abut against the honing head body 11 and play a limiting role.

[0038] In one embodiment, the flexible honing tool of the present invention further includes a limiting 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 limiting groove 222 along the left-right direction is provided on the cone 22. The limiting pin 7 is fixedly connected to the base 1 and disposed in the limiting groove 222. When the push rod 2 is at its foremost extreme position relative to the base 1, the limiting pin 7 abuts against the rear side of the limiting groove 222. When the push rod 2 is at its rearmost extreme position relative to the base 1, the limiting pin 7 abuts against the front side of the limiting groove 222.

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

[0040] like Figure 5-8 As shown, the flexible honing strip assembly 3 includes an expansion base 31, a floating base 32, a plurality of positioning beads 34 disposed between the expansion base 31 and the floating base 32, a honing stone 33 disposed 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 mates 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 when it is in contact with the conical surface 221 of the cone 22, the honing stone 33 can always be in contact with the bottom surface of the spiral groove of the deep hole workpiece 6 when the cone 22 pushes the flexible honing strip assembly 3 to move radially relative to the push rod 2. Figure 3 As shown, the expansion base 31 is not parallel to the axis C extending in the front-rear direction relative to the top rod 2, and multiple expansion bases 31 are arranged relatively parallel to each other, thus fitting the spiral groove shape of the deep hole workpiece 6. The number of flexible honing strip 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 equipped with 14 flexible honing strip assemblies 3 to process 14 spiral grooves of the deep hole workpiece 6 at intervals at one time, and then process another 14 spiral grooves after completion.

[0042] One of the expansion base 31 and the floating base 32 is provided with a floating groove 311, and at least a part of the other of the expansion base 31 and the floating base 32 is disposed in the floating groove 311. The positioning bead 34 is used to provide the floating base 32 to float in the left and right directions relative to the expansion base 31, and the limiting pin 35 is used to prevent the expansion base 31 from disengaging from the floating base 32.

[0043] In one embodiment, the expansion base 31 has a floating groove 311, and the bottom of the floating base 32 is disposed in the floating groove 311. Specifically, the floating groove 311 is oriented upwards, 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 342, and an elastic element 343. The positioning bead body 341 has an inner cavity, and a through hole communicating with the outside is opened on one side of the positioning bead body 341 along its length extension direction. The elastic element 343 is disposed in the inner cavity and abuts against the positioning bead body 341 and the bead 342 respectively. When the elastic element 343 is in its natural state, the bead 342 is disposed in the through hole and protrudes outward relative to the through hole. When the bead 342 is subjected to force, the elastic element 343 is compressed, and the bead 342 can retract inward relative to the through hole.

[0045] Multiple positioning beads 34 are fixedly connected to the floating base 32 and are arranged in equal numbers on the left and right sides of the floating base 32. The floating groove 311 is provided with an arc-shaped groove 312 for accommodating the bead body 342 of the positioning beads 34.

[0046] Specifically, the bottom of the floating base 32 has slots extending in the left-right direction, the number of which is equal to the number of positioning beads 34, such as... Figure 8 As shown, there are four slots 321, and four positioning beads 34 are correspondingly provided. The positioning beads 34 are fixedly disposed in the slots 321, with the bead bodies 342 of two positioning beads 34 facing the left side of the floating slot 311, and the bead bodies 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-rear 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 disposed on the front side of the floating base in the front-rear direction, and the two positioning beads protruding from the right side of the floating base 32 are disposed on the rear side of the floating base in the front-rear 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 wall of the floating groove 311 when no force is applied. When using this flexible honing tool, the honing stone 33 can also always remain parallel to the side wall of the spiral groove when no external force is applied, thus improving the honing accuracy.

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

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

[0049] In one embodiment, the flexible honing tool for multi-spiral grooves of the present invention further includes a second elastic element 5, which provides an elastic force for radially retracting the flexible honing strip assembly 3 relative to the top rod 2. Specifically, the second elastic element 5 can be a tension spring, the number of which can correspond to the number of flexible honing strip 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 part of the expansion base 31 is disposed in the guide groove. The number of guide grooves corresponds to the number of flexible honing strip assemblies 3. The guide groove is used to provide guidance for the flexible honing strip assembly to expand and contract radially relative to the top rod 2.

[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. To meet this tolerance, the width of the floating groove 311 in the left and right direction is set to M, and the width of the bottom of the floating base 32 in the left and right direction is set to N, satisfying MN≥2*f. The extension and retraction h of the ball body 341 of the positioning bead 34 in the left and right direction 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 placed in the deep hole workpiece 6 to be processed. The push rod 2 is pushed from back to front, which drives the cone 22 to move from back to front. The conical surface 221 of the cone 22 pushes the arc-shaped surface 313 of the expansion base 31, so that the flexible honing strip assembly 3 moves radially relative to the push rod 2 along the guide groove and expands, thereby making the honing stone 33 fit with the spiral groove for honing. At this time, the first elastic element 14 is compressed to accumulate elastic force, and the second elastic element 5 is stretched to accumulate 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 element 14, and the flexible honing strip assembly 3 moves radially relative to the push rod 2 and contracts due to the elastic force of the second elastic element 5.

[0054] In the description of this invention, the directions such as "front," "rear," "left," "right," "up," and "down" are defined for ease of description, i.e., as... Figure 4 As shown, for flexible honing tools, the left direction in the figure is "front," the right direction is "back," the top direction is "up," the bottom direction is "down," and the directions perpendicular to the viewing angle are "left" and "right." Figure 7 As shown, for the flexible honing strip assembly, the left direction in the figure is "front", the right direction is "rear", the upper direction is "up", the lower direction is "down", and the directions perpendicular to the viewing angle in the figure are "left" and "right". The above definitions of directions are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0055] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A flexible honing tool for multi-spiral grooves, characterized in that, include: The system comprises a base, a push rod movable relative to the base in a front-rear direction, and a plurality of flexible honing strip assemblies that can be pushed by the conical surface of the push rod to expand radially relative to the push rod. Each flexible honing strip assembly includes: an expansion base, a floating base, a plurality of positioning beads disposed between the expansion base and the floating base, a honing stone disposed on the floating base, and a limiting pin inserted between the expansion base and the floating base. The expansion base engages with the conical surface. One of the expansion base and the floating base has a floating groove, and at least a portion of the other of the expansion base and the floating base is disposed in the floating groove. The positioning beads provide lateral floating of the floating base relative to the expansion base, and the limiting pin prevents the expansion base from detaching from the floating base. Multiple positioning beads are fixedly connected to the floating base and protrude from the left and right sides of the floating base in equal numbers. The floating groove is provided with an arc-shaped groove for accommodating the positioning beads. Two positioning beads are respectively protruding from the left and right sides of the floating base. In the front-back direction of the floating base, the two positioning beads protruding from the left side of the floating base are offset from the two positioning beads protruding from the right side of the floating base.

2. The flexible honing tool for multi-spiral grooves according to claim 1, characterized in that: The expansion base has the floating groove, and the bottom of the floating base is disposed in the floating groove.

3. The flexible honing tool for multi-spiral grooves according to claim 1, characterized in that: Two positioning beads protruding from the left side of the floating base are located on one side of the floating base in the front-back direction, and two positioning beads protruding from the right side of the floating base are located on the other side of the floating base in the front-back direction.

4. The flexible honing tool for multi-spiral grooves according to claim 2, characterized in that: The limiting pin is fixedly connected to the floating base, and the limiting pin is inserted into the expansion base with a clearance fit.

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

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

7. The flexible honing tool for multi-spiral grooves according to claim 1, characterized in that: The expansion base is provided with an arc-shaped surface that mates with the conical surface.

8. The flexible honing tool for multi-spiral grooves according to any one of claims 1-7, characterized in that: The substrate is also provided with a guide groove, and at least part of the expansion base is disposed in the guide groove. The guide groove is used to provide guidance for the flexible honing strip assembly to expand radially relative to the push rod.

9. The flexible honing tool for multi-spiral grooves according to any one of claims 1-7, characterized in that: The expansion base is not parallel to the axis of the top rod, but the multiple expansion bases are arranged relatively parallel to each other.

10. The flexible honing tool for multi-spiral grooves according to any one of claims 1-7, characterized in that: The flexible honing tool for multi-helical grooves further includes a first elastic element for providing an elastic force that returns the push rod to its original position relative to the substrate.

11. The flexible honing tool for multi-spiral grooves according to any one of claims 1-7, characterized in that: The flexible honing tool for multi-helical grooves further includes a second elastic element for providing an elastic force that causes the flexible honing strip assembly to contract radially relative to the push rod.

12. The flexible honing tool for multi-spiral grooves according to any one of claims 1-7, characterized in that: The flexible honing tool for multi-spiral grooves also includes a limiting pin configured to restrict the push rod from moving further forward or further backward relative to the substrate.

Images