Tool for centerless grinding machine to grind bars and wires

Abstract

The utility model provides a tool for a centerless grinding machine to grind bars and wires, and relates to the technical field of metal bar and wire machining, the tool comprises a tool bottom plate and a feeding lifting frame, and the tool bottom plate and the feeding lifting frame are connected through a supporting seat component; the feeding lifting frame comprises an upper guide pressing plate and a lower guide supporting plate which are fixed through a hooping device, the upper guide pressing plate and the lower guide supporting plate are provided with an upper nylon damping plate and a lower nylon damping plate respectively, and a spindle-shaped clamping hole is formed between the upper nylon damping plate and the lower nylon damping plate in a linear penetrating mode in the length direction. The ratio of the length of the feeding lifting frame to the height of the spindle-shaped clamping hole is larger than 50: 1. The upper nylon damping plate and the lower nylon damping plate are used for clamping the to-be-machined metal bar and wire, soft fixing is achieved, based on large-size fixing that the ratio of the length of the feeding lifting frame to the height of the spindle-shaped clamping hole is larger than 50: 1, the bending phenomenon of the to-be-machined metal bar and wire is prevented, straightening is carried out in advance, and straightening cannot directly affect the surface quality of the to-be-machined metal bar and wire.

Description

Technical Field

[0001] This application relates to the field of metal rod and wire processing technology, and more specifically, to a tooling for grinding rods and wires on a centerless grinder. Background Technology

[0002] In centerless grinding of bar wire, the grinding wheel, guide wheel, and support inserts (plates) are used to position and rotate the bar wire, achieving circumferential feed, axial feed, and grinding. Bar wire has a large length-to-diameter ratio and poor rigidity, making it prone to elastic deformation and potential sagging under gravity. As the bar wire moves forward in the centerless grinder, the lack of a support and guide device at the feed end to prevent vibration and elastic deformation leads to misalignment, vibration, and elastic deformation as it enters the grinding zone. This results in uneven contact between the grinding wheel and the workpiece surface, making it difficult to control dimensional accuracy and shape tolerances. The bar wire surface is also prone to defects such as scratches, fish-scale patterns, rounded edges, abrasions, spiral patterns, and vibration marks. To fix the bar wire during centerless grinding, existing technologies include:

[0003] (1) Chinese utility model patent with publication number CN212071316 U discloses a centerless grinding device for hard metal rods, including a hard metal rod that passes through the interior of a clamp, with the protruding part of the hard metal rod passing through the gap in the middle of a secondary grinding disc. The surface of the secondary grinding disc is covered with wool felt, and the hard metal rod subsequently passes through one side of the gap in the middle of a main grinding disc. The surface of the main grinding disc is covered with a rubber surface layer, and a drive shaft is welded to the center of the main grinding disc. A belt groove is opened in the middle of the drive shaft, and a belt is tensioned and installed inside the belt groove. The end of the belt is fitted into a motor shaft, and a motor is fixedly installed at the end of the motor shaft. A bearing is inserted into the tail of the drive shaft, and the outer ring of the bearing is fixedly installed inside the bearing seat. However, this solution can only clamp metal rods of a fixed size, and it is a rigid fixation. If the clamping is too tight, it will affect the forward delivery of the metal rod along the production line. If the clamping force is insufficient, it will affect the fixing effect and will not play a shock-absorbing role. At the same time, the fixing device of this solution is a local fixation, which still does not solve the problem of bending of the rod to be processed over a long distance. If the setting position of the fixing device is extended, the clamping force problem of the fixing device will occur again.

[0004] (2) Chinese utility model patent CN 217493639 U discloses a centerless grinder for polishing titanium alloy wire, including a frame, a pair of grinding rollers, and a cooling nozzle. The pair of grinding rollers are movably mounted on the frame, and the cooling nozzle is mounted on one of the grinding rollers. The cooling nozzle is connected to a cooling water supply channel. A pair of symmetrical fastening and guiding components are arranged on the frame and on both sides of the pair of grinding rollers. The pair of symmetrical fastening and guiding components on both sides of the grinding rollers clamp and guide the passing wire, keeping the wire straight during the process and making the grinding process more stable. This solution has the same problem as the previous solution, that is, its fixation is rigid and partial, which makes it difficult to control the clamping force, cannot play a good role in shock absorption, and does not solve the problem of wire bending. The bent wire is easily scratched and damaged when passing through the fixing device.

[0005] In summary, the existing technical solutions for fixing bar wires during centerless grinding still have problems, so a tooling for grinding bar wires on a centerless grinder is needed. Summary of the Invention

[0006] To solve the above problems, the technical solution adopted in this application is a tooling for grinding bar wire on a centerless grinder, including a tooling base plate and a feeding support frame, which are connected by a support base component.

[0007] The feeding support frame includes an upper guide plate and a lower guide plate fixed by a clamping device. The upper guide plate and the lower guide plate are respectively provided with an upper nylon damping plate and a lower nylon damping plate. A spindle-shaped clamping hole is provided through the upper nylon damping plate and the lower nylon damping plate in a straight line along the length direction. The ratio of the length of the feeding support frame to the height of the spindle-shaped clamping hole is greater than 50:1.

[0008] Optionally, waist-shaped mounting holes are machined along the longitudinal direction of the tooling base plate, the upper and lower planes of the tooling base plate are parallel to each other, and the inner wall of the waist-shaped mounting holes is perpendicular to the lower plane of the tooling base plate.

[0009] Optionally, the parallelism tolerance between the upper and lower planes of the tooling base plate is less than 10 μm, and the perpendicularity tolerance between the inner wall of the waist-shaped mounting hole and the lower plane of the tooling base plate is less than 10 μm.

[0010] Optionally, the support component includes a height-adjustable support rod, a lower guide plate support, and a fastening positioning bolt. The lower and upper ends of the height-adjustable support rod are both threaded. A positioning boss is provided above the thread at the lower end of the height-adjustable support rod, and the lower plane of the positioning boss is perpendicular to the height-adjustable support rod.

[0011] Optionally, the height adjustment support rod is prepared by a one-time clamping turning process.

[0012] Optionally, the lower guide plate support seat is provided with a V-shaped guide positioning groove. The lower guide plate includes a V-shaped long base plate. The lower guide plate is installed by cooperating with the V-shaped guide positioning groove through the V-shaped long base plate. The lower nylon damping plate, the V-shaped long base plate and the lower guide plate support seat are fixed by bolts passing through them in sequence. The bolt heads are set inside the lower nylon damping plate.

[0013] Optionally, the clamping device includes a tightening wrench and a movable clamping plate made of elastic metal material. One end of the movable clamping plate is movably connected to one side of the lower guide plate support. The tightening wrench is located on the other side of the lower guide plate support and is used to fix the unconnected end of the movable clamping plate.

[0014] Optionally, a brush section is provided inside one end of the feed inlet of the spindle-shaped clamping hole. The inner diameter of the brush section is larger than the inner diameter of the non-brush section. The brushes are symmetrically arranged on the lower surface of the upper guide plate and the upper surface of the lower guide plate.

[0015] The beneficial effects of this invention are:

[0016] 1. By clamping the metal rods and wires to be processed with upper and lower nylon damping plates, soft fixation is achieved, which fully eliminates the adverse conditions such as material vibration caused by feeding and self-weight of the rods and wires. Based on the large-size fixation with the ratio of the length of the feeding support frame to the height of the spindle-shaped clamping hole being greater than 50:1, bending of the rods and wires to be processed due to excessive length-to-diameter ratio is prevented, and pre-straightening is performed. Since it is a soft fixation, this straightening will not directly affect the surface quality of the wires to be processed.

[0017] 2. By using the spindle-shaped clamping hole, when clamping metal rods and wires with a size larger than the clamping hole, it is still possible to provide local surface contact fixation based on the soft fixation provided by the nylon damping plate. This fixation method does not cause a decrease in the surface quality of the material and also achieves stable clamping, making it suitable for processing metal rods and wires of various sizes. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0019] Figure 1 This is a first perspective view of the overall structure of the tooling for grinding bar and wire materials with a centerless grinder, as provided in an embodiment of this application.

[0020] Figure 2 This application provides a second perspective schematic diagram of the overall structure of a tooling for grinding bar and wire materials using a centerless grinder.

[0021] Figure 3 This is a partially enlarged side view of the feeding support frame provided in an embodiment of this application.

[0022] Explanation of reference numerals in the attached drawings: 1-Tooling base plate; 2-Height adjustment support rod; 3-Lower guide plate support seat; 4-Modible clamping pressure plate; 5-Tightening wrench; 6-V-shaped long base plate; 7-Lower nylon damping plate; 8-Upper nylon damping plate; 9-Spindle-shaped clamping hole; 10-Oval mounting hole; 11-Positioning boss; 12-Brush; 13-Metal rod / wire material to be processed. Detailed Implementation

[0023] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0024] like Figures 1-3 As shown, a tooling for grinding bar wire on a centerless grinder includes a tooling base plate 1 and a feeding support frame, which are connected by a support base component.

[0025] The feeding support frame includes an upper guide plate and a lower guide plate fixed by a clamping device. The upper guide plate and the lower guide plate are respectively provided with an upper nylon damping plate 8 and a lower nylon damping plate 7. A spindle-shaped clamping hole 9 is provided through the upper nylon damping plate 8 and the lower nylon damping plate 7 in a straight line along the length direction. The ratio of the length of the feeding support frame to the height of the spindle-shaped clamping hole 9 is greater than 50:1.

[0026] The spindle-shaped clamping hole 9 forms localized surface contact friction with the metal rod / wire 13 under the clamping of the clamping device and the localized deformation of the upper nylon damping plate 8 and lower nylon damping plate 7. This allows the metal rod / wire 13 to quickly adjust from a feed vibration state to a stable feed state, eliminating vibrations caused by feed and its own weight. This ensures the metal rod / wire remains in good condition for subsequent grinding. Furthermore, because the hardness of the nylon damping plate is lower than that of the metal rod / wire 13, the action of the upper and lower nylon damping plates prevents surface defects such as scratches from appearing on the metal rod / wire 13.

[0027] The upper and lower nylon damping plates clamp the metal rod / wire 13 to be processed, achieving soft fixation and effectively eliminating adverse conditions such as material vibration caused by feeding and its own weight. Based on the large-scale dimension fixation with a length-to-diameter ratio of more than 50:1 between the length of the feeding support frame and the height of the spindle-shaped clamping hole 9, bending of the metal rod / wire 13 to be processed due to excessive length-to-diameter ratio is prevented, and pre-straightening is performed. Since it is a soft fixation, this straightening will not directly affect the surface quality of the wire to be processed.

[0028] By using the spindle-shaped clamping hole 9, when clamping metal rods and wires with a size larger than the clamping hole, it is still possible to provide local surface contact fixation based on the soft fixation provided by the nylon damping plate. This fixation method does not cause a decrease in the surface quality of the material and also achieves stable clamping, making it suitable for processing metal rods and wires of various sizes.

[0029] like Figure 1 and Figure 2 As shown, in another embodiment of this application, waist-shaped mounting holes 10 are machined along the longitudinal direction of the tooling base plate 1. The upper and lower planes of the tooling base plate 1 are parallel to each other, and the inner wall of the waist-shaped mounting holes 10 is perpendicular to the lower plane of the tooling base plate 1.

[0030] like Figure 1 As shown, in another embodiment of this application, the parallelism tolerance of the upper and lower planes of the tooling base plate 1 is less than 10 μm, and the perpendicularity tolerance between the inner wall of the waist-shaped mounting hole 10 and the lower plane of the tooling base plate 1 is less than 10 μm. To ensure the fixing accuracy of the tooling provided in this application for grinding bar wire on a centerless grinder, the parallelism tolerance of the upper and lower planes of the tooling base plate 1 is required to be less than 10 μm, and the perpendicularity tolerance between the inner wall of the waist-shaped mounting hole 10 and the lower plane of the tooling base plate is required to be less than 10 μm. This meets and exceeds the tolerance grade 3 requirement of >250-400 mm for the main parameter in Appendix B3 of GB / T 1184-1996, "Parallelism, Perpendicularity, Inclination," which is less than 10 μm.

[0031] like Figure 1 and Figure 2 As shown, in another embodiment of this application, the support base component includes a height-adjustable support rod 2, a lower guide plate support base 3, and a fastening positioning bolt. Both the lower and upper ends of the height-adjustable support rod 2 are threaded. A positioning boss 11 is provided above the thread at the lower end of the height-adjustable support rod 2, and the lower plane of the positioning boss 11 is perpendicular to the height-adjustable support rod 2. Using the thread at the lower end of the height-adjustable support rod 2, the positioning boss 11, and the waist-shaped mounting hole 10 of the tooling base plate 1, the two are fastened together using a lock nut. Simultaneously, the position of each height-adjustable support rod 2 is adjusted through the waist-shaped mounting hole 10 to ensure it is aligned with the machining position of the centerless grinder.

[0032] like Figure 1 and Figure 2 As shown, in another embodiment of this application, the height adjustment support rod 2 is prepared by a one-time clamping turning process. The height adjustment support rod 2 should be machined in a single clamping turning operation to ensure its cylindricity and the coaxiality of its upper and lower end threads, thereby ensuring the structural assembly accuracy and installation position accuracy of the tooling provided in this application for centerless grinding of bar wire.

[0033] like Figure 1 and Figure 2 As shown, in another embodiment of this application, the lower guide plate support 3 is provided with a V-shaped guide positioning groove. The lower guide plate includes a V-shaped long base plate 6. The lower guide plate is installed by engaging the V-shaped guide positioning groove of the lower guide plate support 3 with the V-shaped long base plate 6. The lower nylon damping plate 7, the V-shaped long base plate 6, and the lower guide plate support 3 are fixed by bolts passing through them in sequence. The bolt heads are recessed inside the lower nylon damping plate 7. The V-shaped long base plate 6 enables precise positioning between the lower guide plate and the lower guide plate support 3. The recessed bolt heads inside the lower nylon damping plate 7 prevent scratching of the metal rod / wire 13 to be processed while fixing the lower nylon damping plate 7.

[0034] like Figure 1 and Figure 2 As shown, in another embodiment of this application, the clamping device includes a tightening wrench 5 and a movable clamping plate 4 made of elastic metal material. One end of the movable clamping plate 4 is movably connected to one side of the lower guide plate support 3, and the tightening wrench 5 is disposed on the other side of the lower guide plate support 3 for fixing the unconnected end of the movable clamping plate 4. In this embodiment, the movable clamping plate 4 is made of SUS301 stainless steel, which gives it good elastic properties and, in conjunction with the tightening wrench 5, fixes metal rods and wires 13 of different sizes to be processed.

[0035] like Figures 1-3 As shown, in another embodiment of this application, a brush section is provided inside one end of the feed inlet of the spindle-shaped clamping hole 9. The inner diameter of the brush section is larger than the inner diameter of the non-brush section. The brushes 12 are symmetrically arranged on the lower surface of the upper guide plate and the upper surface of the lower guide plate. This prevents impurities and slag carried by the metal rod / wire 13 to be processed from being carried into the spindle-shaped clamping hole 9 and embedded in the nylon damping plate. Impurities embedded in the nylon damping plate will scratch the surface of the clamped metal rod / wire 13. When the metal rod / wire 13 passes through the brush section, the brushes 12 contact the metal rod / wire 13 to stabilize the feed state of the metal rod / wire 13 and clean the surface impurities of the metal rod / wire 13 to prevent the impurities from affecting the subsequent grinding process.

[0036] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A fixture for grinding bar wire on a centerless grinder, comprising a fixture base plate and a feed support frame, wherein the fixture base plate and the feed support frame are connected by a support base component, characterized in that: The feeding support frame includes an upper guide plate and a lower guide plate fixed by a clamping device. The upper guide plate and the lower guide plate are respectively provided with an upper nylon damping plate and a lower nylon damping plate. A spindle-shaped clamping hole is provided through the upper nylon damping plate and the lower nylon damping plate in a straight line along the length direction. The ratio of the length of the feeding support frame to the height of the spindle-shaped clamping hole is greater than 50:

1.

2. The tooling for grinding bar and wire materials on a centerless grinder as described in claim 1, characterized in that: The tooling base plate is longitudinally arranged with waist-shaped mounting holes. The upper and lower planes of the tooling base plate are parallel to each other, and the inner wall of the waist-shaped mounting hole is perpendicular to the lower plane of the tooling base plate.

3. The tooling for grinding bar and wire materials on a centerless grinder as described in claim 2, characterized in that: The parallelism tolerance of the upper and lower planes of the tooling base plate is less than 10 μm, and the perpendicularity tolerance of the inner wall of the waist-shaped mounting hole to the lower plane of the tooling base plate is less than 10 μm.

4. The tooling for grinding bar and wire materials on a centerless grinder as described in claim 2, characterized in that: The support component includes a height-adjustable support rod, a lower guide plate support, and a fastening positioning bolt. The lower and upper ends of the height-adjustable support rod are both threaded. A positioning boss is provided above the thread at the lower end of the height-adjustable support rod, and the lower plane of the positioning boss is perpendicular to the height-adjustable support rod.

5. The tooling for grinding bar and wire materials on a centerless grinder as described in claim 4, characterized in that: The height adjustment support rod is manufactured using a single-clamp turning process.

6. The tooling for grinding bar and wire materials on a centerless grinder as described in claim 3, characterized in that: The lower guide plate support seat is provided with a V-shaped guide positioning groove. The lower guide plate includes a V-shaped long bottom plate. The lower guide plate is installed by the cooperation of the V-shaped long bottom plate and the V-shaped guide positioning groove. The lower nylon damping plate, the V-shaped long bottom plate and the lower guide plate support seat are fixed by bolts passing through them in sequence. The bolt heads are recessed inside the lower nylon damping plate.

7. The tooling for grinding bar and wire materials on a centerless grinder as described in claim 5, characterized in that: The clamping device includes a tightening wrench and a movable clamping pressure plate made of elastic metal material. One end of the movable clamping pressure plate is movably connected to one side of the lower guide plate support. The tightening wrench is located on the other side of the lower guide plate support and is used to fix the unconnected end of the movable clamping pressure plate.

8. The tooling for grinding bar and wire materials on a centerless grinder as described in claim 1, characterized in that: The spindle-shaped clamping hole has a brush section inside one end of the feed inlet. The inner diameter of the brush section is larger than the inner diameter of the non-brush section. The brushes are symmetrically arranged on the lower surface of the upper guide plate and the upper surface of the lower guide plate.

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