Tooth grinding jig for high-precision spiral screw

Abstract

The utility model discloses a tooth grinding jig for a high-precision spiral screw. Comprising a centering assembly installed on one side of a grinding machine, an oil cylinder installed at the front end of the centering assembly and used for providing power, and a chuck assembly installed at the front end of the oil cylinder and used for clamping a screw. The center ejector pin is installed on the chuck assembly and used for abutting against a center groove in one end of a screw rod, the tailstock ejector pin is installed on the other side of the grinding machine and used for abutting against a center groove in the other end of the screw rod, and a conical center used for abutting against the center groove is arranged in the center of the center ejector pin. An airtight hole used for detecting whether the screw rod is installed in place is axially formed in the center ejector pin, and the airtight hole is externally connected with an airtight detector. By means of the mode, the screw tooth grinding clamp can be matched with screws with different outer diameters, the screws are clamped from the axial direction and the periphery, the rigidity of the clamp is guaranteed, the assembling precision is improved, the device structure is stable, and the high-precision machining requirement for screw tooth grinding is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to screw jig technical field, especially a kind of high-precision spiral screw gear grinding jig. BACKGROUND

[0002] Screw is the cylindrical that outer surface is cut with spiral groove or the cone that is cut with conical spiral groove, screw is widely used in petroleum, chemical industry, rubber, plastics, papermaking etc. Mechanical industry, with the rapid development of mechanical industry, the precision requirement of screw processing is higher and higher, usually need to be turned gear grinding to screw, in gear grinding process, clamping fixture is needed to be used to clamp and fix screw, conventional clamping mode is to clamp the one end of screw, and the processing area is much larger than the clamping area, in high-speed rotation process, screw vibrates violently in fixture due to the influence of cutting force, fixture is insufficient in rigidity, and dislocation is prone to occur, to cause screw bending, deformation, roughness and many other problems, not in line with the high-precision processing requirement of screw.

[0003] Based on the above defects and shortcomings, it is necessary to improve the existing technology, and design a high-precision spiral screw gear grinding jig. CONTENT OF UTILITY MODEL

[0004] The utility model mainly solves the technical problem to provide a kind of high-precision spiral screw gear grinding jig, can be adapted to the screw of different outer diameter, is clamped from the axial and periphery to screw, guarantee fixture rigidity, improve assembly accuracy, device structure is stable, meet the high-precision processing requirement of screw gear grinding.

[0005] To solve the above technical problems, one technical scheme of the utility model is: provide a kind of high-precision spiral screw gear grinding jig, the high-precision spiral screw gear grinding jig includes the centering assembly installed in the one side of grinder, the oil cylinder installed in the front end of centering assembly for providing power, the chuck assembly for clamping screw installed in the front end of oil cylinder, the centering pin for pressing the one end of screw tip slot installed on chuck assembly and the tailstock centering pin for pressing the other end of screw tip slot installed on the other side of grinder, the centering pin center position is provided with the conical tip for pressing tip slot, and the gas-tight hole for detecting whether screw is installed in place is arranged in the axial direction of centering pin, and the gas-tight detector is connected to the gas-tight hole.

[0006] Preferably, the bottom of the centering pin is provided with a mounting portion for mounting in the center position of the chuck assembly, and the tightening screw passes through the mounting portion to mount the centering pin on the chuck assembly.

[0007] Preferably, the chuck assembly comprises a swing compensation three-jaw chuck and a movable chuck jaw, the swing compensation three-jaw chuck is mounted on the oil cylinder for improving clamping stability and precision, three bevel gears of the swing compensation three-jaw chuck are respectively provided with movable chuck jaws for clamping the screw rod, the movable chuck jaw is provided with a sliding block part slidably mounted on the bevel gear and a clamping part for clamping the screw rod, the clamping part is provided with a contoured camber surface matched with the outer side surface of the screw rod near one end of the screw rod, and the swing compensation three-jaw chuck is provided with a push rod for controlling the opening and closing of the bevel gears.

[0008] Preferably, the oil cylinder is provided with a groove at the bottom, an oil supply connector is mounted on the outer side of the oil cylinder, and a piston rod is fixedly connected with the push rod and arranged in the oil cylinder for driving the push rod.

[0009] Preferably, the centering assembly comprises a centering base plate, a positioning block and an adjusting screw, the centering base plate is mounted on the output end of the grinding machine, the outer end surface of the centering base plate is an installation surface for mounting the oil cylinder, the installation surface is provided with a contoured protrusion matched with the groove and used for quickly positioning the oil cylinder, the centering base plate is provided with the positioning block around, and the positioning block is provided with the adjusting screw for clamping and fixing the oil cylinder.

[0010] Compared with the prior art, the device has the following beneficial effects:

[0011] By arranging the centering assembly, the device can be ensured to be located at the rotation center of the output end of the grinding machine.

[0012] By arranging the center pin and the tail seat pin, the screw rod can be clamped from the axial direction, and the swing of the screw rod during high-speed rotation can be avoided.

[0013] The center pin is provided with an airtight hole for detecting whether the screw rod is assembled in place, so that the screw rod can be ensured to be assembled in place.

[0014] By arranging the swing compensation three-jaw chuck, the angle of the bevel gear can be automatically adjusted during high-speed rotation, the movable chuck jaw can be self-centered to clamp the screw rod, and the clamping stability and precision of the screw rod during machining can be ensured.

[0015] By arranging the movable chuck jaw slidably mounted on the bevel gear, the movable chuck jaw can be matched with screw rods of different thicknesses, and the contoured camber surface can stably clamp the outer side surface of the screw rod.

[0016] The device can be matched with screw rods of different outer diameters, and the screw rod can be clamped from the axial direction and the periphery, so that the rigidity of the clamp is ensured, the assembly precision is improved, the device structure is stable, and the high-precision machining requirement of the screw rod is met. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic view of a screw rod to be machined.

[0018] Figure 2 It is a structural schematic view of a high-precision spiral screw gear grinding jig.

[0019] Figure 3 It is a partial sectional view of a high-precision spiral screw gear grinding jig.

[0020] Figure 4 It is a structural schematic view of a centering assembly of a high-precision spiral screw gear grinding jig.

[0021] Figure 5 It is a structural schematic view of an oil cylinder of a high-precision spiral screw gear grinding jig.

[0022] Figure 6 It is a structural schematic view of a chuck assembly of a high-precision spiral screw gear grinding jig.

[0023] Among them, 1, the centering assembly, 11, the centering base, 12, the positioning block, 13, the adjusting screw, 111, the profiling convex block;

[0024] 2, the oil cylinder, 21, the groove, 22, the oil joint, 23, the piston rod;

[0025] 3, the chuck assembly, 31, the swing compensation three-jaw chuck, 32, the movable jaw, 311, the bevel gear, 312, the push rod, 321, the sliding block part, 322, the clamping part, 3211, the profiling camber;

[0026] 4, the centering pin, 41, the mounting part, 42, the tapered center, 43, the air-tight hole;

[0027] 5, the tailstock pin;

[0028] 100, the screw, 101, the centering groove. DETAILED DESCRIPTION

[0029] The preferred embodiments of the utility model are described in detail below with reference to the drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, and the protection scope of the utility model can be more clearly and explicitly defined.

[0030] Please refer to Figures 1 to 6 The utility model embodiment includes:

[0031] A high-precision spiral screw gear grinding jig, which comprises a centering assembly 1, an oil cylinder 2, a chuck assembly 3, a centering pin 4 and a tailstock pin 5, the rear end of the centering assembly 1 is installed on one side of a grinding machine, the front end of the centering assembly 1 is provided with the oil cylinder 2 for providing power, the front end of the oil cylinder 2 is provided with the chuck assembly 3 for clamping the screw 100, such as Figure 1As shown, the screw 100 is provided with a top end face and a bottom end face, each of which is provided with an inward top end groove 101, and the chuck assembly 3 is provided with a center center pin 4 matched with the top end groove 101 and used for abutting against the screw 100, and the grinder is provided with a tail center pin 5 used for abutting against the other top end groove 101 of the screw 100, and the tail center pin 5 is opposite to the center center pin 4, and the tail center pin 5 is used for abutting against the other top end groove 101 of the screw 100. Figure 2 As shown, the center center pin 4 and the tail center pin 5 abut against the top end grooves 101 at the two ends of the screw 100 respectively, and the chuck assembly 3 clamps one end of the screw 100, so that the screw 100 is clamped and fixed.

[0032] The centering assembly 1 comprises a centering base 11, a positioning block 12 and an adjusting screw 13, the centering base 11 is installed at the output end of the grinder, the outer end face of the centering base 11 is an installation face used for installing the oil cylinder 2, the installation face is provided with a profiling convex block 111 matched with the groove 21 at the bottom of the oil cylinder 2 and used for quickly positioning the oil cylinder 2, the centering base 11 is provided with the positioning block 12 around, and the positioning block 12 is provided with the adjusting screw 13 used for clamping and fixing the oil cylinder 2, the adjusting screw 13 is rotated to abut against the outer end face of the oil cylinder 2 inward, the position of the oil cylinder 2 is finely adjusted, so that the oil cylinder 2 is guaranteed to be located at the rotation center of the output end of the grinder, and after the adjustment, the oil cylinder 2 is locked on the centering base 11 by a screw.

[0033] The oil cylinder 2 is provided with the groove 21 at the bottom, the oil cylinder 2 is provided with an oil supply connector 22 used for oil supply at the outer side, and the oil cylinder 2 is provided with a piston rod 23 used for driving the chuck assembly 3, the piston rod 23 is fixedly connected with the pushing rod 312 of the chuck assembly 3, the oil cylinder 2 is supplied with oil through the oil supply connector 22, the piston rod 23 is driven by the oil cylinder 2 to stretch out forward, and the pushing rod 312 is driven by the piston rod 23 to stretch out forward.

[0034] The chuck assembly 3 further comprises a swing compensation three-jaw chuck 31 and a movable jaw 32, the swing compensation three-jaw chuck 31 is installed on the oil cylinder 2 for improving the clamping stability and accuracy, three bevel gears 311 of the swing compensation three-jaw chuck 31 are respectively provided with the movable jaw 32 for clamping the screw rod 100, the movable jaw 32 is provided with a sliding block part 321 slidably installed on the bevel gear 311 and a clamping part 322 for clamping the screw rod 100, the sliding block part 321 can adjust its position on the bevel gear according to the thickness of the screw rod 100, and after adjusting the position, it is locked, the clamping part 322 is provided with a profiled camber 3211 matched with the outer side of the screw rod 100 near one end of the screw rod 100, the profiled camber 3211 is set according to the outer side of the screw rod 100, the swing compensation three-jaw chuck 31 is provided with a push rod 312 for controlling the opening and closing of the bevel gear 311, the piston rod 23 drives the push rod 312 to extend forward, the bevel gear 311 closes inward, driving the movable jaw 32 to close inward, the profiled camber 3211 closes inward to the screw rod 100, clamping the screw rod 100, after processing is completed, the push rod 312 is retracted, the bevel gear 311 is opened, driving the movable jaw 32 to open, and the profiled camber 3211 is away from the screw rod 100.

[0035] The center pin 4 is provided with a mounting part 41 at the bottom for mounting at the center position of the swing compensation three-jaw chuck 31, a fastening screw passes through the mounting part 41 to mount the center pin 4 on the swing compensation three-jaw chuck 31, a conical center pin 42 for pressing against the center pin groove 101 is arranged at the center position of the mounting part 41, the center pin 4 is axially provided with an airtight hole 43 for detecting whether the screw rod 100 is installed in place, the airtight hole 43 is circumscribed by an airtight detector, the airtight detector is inflated, whether the conical center pin 42 is assembled in place with the center pin groove 101 is detected by air pressure, when the gas circuit is unobstructed, the airtight detector detects that the air pressure is small, indicating that there is a gap between the conical center pin 42 and the center pin groove 101, the screw rod 100 is not assembled in place, the screw rod 100 is moved towards the conical center pin 42 direction until the air pressure reaches a certain value and remains stable, the conical center pin 42 is assembled in place with the center pin groove 101.

[0036] The utility model discloses a kind of high-precision spiral screw gear grinding jig for working, manipulator drives screw 100 to carry out feeding, drive one end centre point groove 101 to be close to center needle 4, airtight detector detects whether screw 100 is assembled in place through airtight hole 43, when airtight detector detects that air pressure reaches certain value and keeps stable, screw 100 is assembled in place, oil supply joint 22 supplies oil cylinder 2, oil cylinder 2 drives piston rod 23 to stretch out, piston rod 23 drives push rod 312 to stretch out, drive swing compensation chuck 31 to close inward, umbrella claw 311 drive movable jaw 32 to clamp screw 100 to center position, tailstock needle 5 is tightly screwed 100 other side's centre point groove 101, manipulator receives clamping signal, loosen screw 100, exit grinding machine, grinding machine receives manipulator exit signal, close grinding machine safety door, start to carry out gear grinding to screw 100.

[0037] The utility model discloses a kind of high-precision spiral screw gear grinding jig, different outer diameter screw can be adapted, from axial and periphery to the screw clamping, guarantee fixture rigidity, improve assembly accuracy, device structure is stable, satisfy the high-precision machining requirement of screw gear grinding.

[0038] The above-mentioned is only the embodiment of the utility model, and does not limit the patent range of the utility model, and equivalent structure or equivalent process transformation using the contents of the utility model specification and drawing, or direct or indirect application in other related technical fields, are also included in the patent protection range of the utility model.

Claims

1. A fixture for grinding high-precision helical screws, characterized in that: The equipment includes a centering assembly (1) installed on one side of the grinding machine, a hydraulic cylinder (2) installed at the front end of the centering assembly (1) for providing power, a chuck assembly (3) installed at the front end of the hydraulic cylinder (2) for clamping the screw (100), a center pin (4) installed on the chuck assembly (3) for pressing against the center groove (101) at one end of the screw (100), and a tailstock pin (5) installed on the other side of the grinding machine for pressing against the center groove (101) at the other end of the screw (100). The center pin (4) has a conical tip (42) at its center for pressing against the center groove (101), and the center pin (4) has an airtight hole (43) axially arranged for detecting whether the screw (100) is installed in place. The airtight hole (43) is connected to an airtightness tester.

2. The high-precision gear grinding fixture for spiral screws according to claim 1, characterized in that: The bottom of the center pin (4) is provided with a mounting part (41) for mounting at the center of the chuck assembly (3), and the fastening screw passes through the mounting part (41) to mount the center pin (4) on the chuck assembly (3).

3. A high-precision gear grinding fixture for spiral screws according to claim 1, characterized in that: The chuck assembly (3) includes a swing-compensated three-jaw chuck (31) and movable jaws (32). The swing-compensated three-jaw chuck (31) is mounted on the cylinder (2) to improve clamping stability and accuracy. Movable jaws (32) for clamping screws (100) are respectively mounted on the three bevel teeth (311) of the swing-compensated three-jaw chuck (31). The movable jaws (32) are provided with a slider part (321) that can be slidably mounted on the bevel teeth (311) and a clamping part (322) for clamping screws (100). The clamping part (322) is provided with a contoured arc surface (3211) that is adapted to the outer side of the screw (100) at the end near the screw (100). A push rod (312) for controlling the opening and closing of the bevel teeth (311) is provided inside the swing-compensated three-jaw chuck (31).

4. A high-precision gear grinding fixture for spiral screws according to claim 3, characterized in that: The bottom of the oil cylinder (2) is provided with a groove (21), an oil connector (22) for supplying oil is installed on the outside of the oil cylinder (2), and a piston rod (23) is provided inside the oil cylinder (2) and is fixedly connected to the push rod (312) for driving the push rod (312).

5. A high-precision gear grinding fixture for spiral screws according to claim 1, characterized in that: The centering assembly (1) includes a centering base (11), a positioning block (12), and an adjusting screw (13). The centering base (11) is installed at the output end of the grinding machine. The outer end face of the centering base (11) is a mounting surface for mounting the hydraulic cylinder (2). The mounting surface is provided with a contoured protrusion (111) that cooperates with the groove (21) and is used for quickly positioning the hydraulic cylinder (2). The positioning block (12) is installed around the centering base (11). The adjusting screw (13) for clamping and fixing the hydraulic cylinder (2) is installed on the positioning block (12).

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