CN110900451B - High-efficient accurate positioning fixture - Google Patents
High-efficient accurate positioning fixture Download PDFInfo
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- CN110900451B CN110900451B CN201911399113.2A CN201911399113A CN110900451B CN 110900451 B CN110900451 B CN 110900451B CN 201911399113 A CN201911399113 A CN 201911399113A CN 110900451 B CN110900451 B CN 110900451B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/02—Frames; Beds; Carriages
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
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Abstract
The invention discloses a high-efficiency accurate positioning clamp, which comprises: the device comprises an accurate positioning device, a measuring device, a tool setting device, a lubricating system and a workpiece positioning and clamping device. The invention ensures the dimensional accuracy and the surface quality of the processing of the wedge-shaped groove of the main connecting rod, solves the problem of the position accuracy of the inclined planes at the two sides of the wedge-shaped groove of the main connecting rod to the center of the large tile hole, improves the processing quality of parts, reduces the labor intensity, improves the production efficiency and meets the processing requirements of high efficiency and high precision.
Description
Technical Field
The invention belongs to the technical field of grinding machine positioning, and relates to an efficient and accurate positioning clamp.
Background
The grinding machine is mainly divided into a cylindrical grinding machine, an internal grinding machine, a surface grinding machine, a coordinate grinding machine, a centerless grinding machine and the like, different clamp types are arranged corresponding to different grinding machines in order to improve the working efficiency and the machining precision, the grinding machine is used for machining various forming surfaces such as planes, internal and external cylinders, cones, notches and the like on parts, and the machining is carried out in a mode of adopting the surface grinding machine and the grinding machine clamp according to the machining characteristics of the main connecting rod.
High-efficient high-power diesel engine owner connecting rod of four-stroke of certain model, adopt integral structural style, by the little first hole of main connecting rod, the ear hole, big tile hole and wedge groove are constituteed, former process scheme adopts vertical milling machine to pass through little first hole, ear hole and main connecting rod terminal surface location clamping, utilize end mill processing 95.1 mm's breach size, and guarantee 89.88 degrees angle size, can't satisfy the processingquality of part, the rejection rate is high or low, the inefficiency, an urgent need is a high efficiency, the anchor clamps of accurate positioning satisfy the processing requirement. Master link configuration and dimensions as shown in fig. 1.
The main technical defects of the original technical scheme are as follows:
(1) the original process scheme adopts a vertical milling machine to position and clamp through a small head hole, an ear hole and the end face of a main connecting rod, an 89.88-degree inclined plane is milled by the vertical milling machine, the dimensional position precision is difficult to guarantee, the processing efficiency is low, and the requirement of batch production cannot be met.
(2) The wedge-shaped groove inclined plane of the main connecting rod is machined, so that high requirements are provided for the angle calculation and adjustment process of the milling machine vertical milling head, the size measurement is difficult, the cutter abrasion is large, the technical level of workers is high, the labor intensity is high, and the requirements for position tolerance and surface roughness are difficult to guarantee.
Through comprehensive analysis, the product processed by the original technical scheme cannot meet the requirements of the wedge-shaped groove processing reliability of the main connecting rod and energy conservation and consumption reduction.
Disclosure of Invention
Objects of the invention
The purpose of the invention is: the utility model provides a high-efficient accurate positioning fixture, according to the drawing requirement, guarantee 95.1 mm's breach size, 89.88 degrees inclined plane size, 22 mm's depth dimension and 95.1mm breach size simultaneously to the position degree requirement of 0.1mm at big tile hole center, reduce the adjustment number of times of lathe in the course of working, improve main connecting rod machining efficiency and quality, satisfy the batch production requirement.
(II) technical scheme
In order to solve the above technical problems, the present invention provides an efficient and accurate positioning jig, comprising: the device comprises a precise positioning device, a measuring device, a tool setting device and a workpiece positioning and clamping device;
the accurate positioning device comprises a body 1, a handle 2, an operating nut 3, a first nut 4, a first screw 5, a first washer 6, a rotating shaft 7, a bushing 8, a second screw 9, a positioning plate 10, a first pin 11, a round nut 12, a support column 13, a fork 14, an adjusting screw 15, a second nut 16, a support pin 17, a knurled nut 18, a second pin 19, a stepped screw 20, a second washer 21 and a third nut 22; the bushing 8 is arranged in an inner hole of the body 1 in an interference fit mode, the rotating shaft 7 and the positioning plate 10 are fixed together through positioning of two first pins 11 and fastening of six second screws 9, the fixed rotating shaft 7 and the positioning plate 10 penetrate through the inner hole of the bushing 8 from the left side and are arranged on the body 1, the first washer 6 is arranged on the rotating shaft 7 from the right side of the rotating shaft 7, the operating nut 3 is screwed on the rotating shaft 7 through threads, the three handles 2 are screwed on the operating nut 3 through threads, the first nut 4 is arranged on the rotating shaft 7 through threads behind the operating nut 3, a gap of 0.5mm is reserved between the operating nut 3 and the first nut 4, and the first screw 5 is arranged on the first nut 4 and limits the first nut 4; the support post 13 is arranged on the positioning plate 10 from the front and the side through two pins and three screws, and the support pin 17 is arranged on the support post 13 from the upper direction and the lower direction through slight interference fit; the fork 14 is fixed on the body 1 through two pins and two screws, a second nut 16 is arranged on the adjusting screw 15 through threads, then the two adjusting screws 15 are arranged on the fork 14 through threads from the upper direction and the lower direction, a second pin 19 passes through small holes at the tops of the knurled nut 18 and the stepped screw 20 and is connected together in an interference fit manner, the circular nut 12 is arranged in a circular hole at the front surface of the pillar 13, then a connecting body of the knurled nut 18 and the stepped screw 20 which are connected together passes through an upper hole of the fork 14, the circular nut 12 which is arranged in the circular hole at the front surface of the pillar 13 passes through a lower hole of the fork 14 through a threaded connection, the bottom of the stepped screw 20 is sleeved with a second washer 21, two identical third nuts 22 are arranged under the second washer 21 through the threaded connection, and a gap of 1mm is reserved between the second washer 21 and the lower end face of the fork 14, the step screw 20 is made to perform a rotational movement in the fork 14 and the column 13;
the knurling nut 18 is rotated clockwise to drive the stepped screw 20 to rotate, the end face of the stepped screw 20 is in contact with the upper plane of the fork 14, the stepped screw performs rotary motion to drive the circular nut 12 arranged in the circular hole of the support column 13 to perform upward linear motion, the support column 13 performs rotary motion through the rotating shaft 7 until the support pin 17 at the upper half part is in close contact with the adjusting screw 15, the operating nut 3 is screwed through the handle 2, and the first accurate positioning is completed; the knurled nut 18 is rotated anticlockwise to drive the stepped screw 20 to rotate, the upper end face of the second washer 21 is in contact with the lower plane of the fork 14, the stepped screw performs rotary motion to drive the circular nut 12 arranged in the circular hole of the support 13 to perform downward linear motion, the support 13 performs rotary motion through the rotating shaft 7 until the lower half support pin 17 is in close contact with the adjusting screw 15, the operating nut 3 is screwed through the handle 2, and the secondary accurate positioning is completed;
the measuring device comprises a third pin 23, a third screw 24, a right positioning piece 25, a semicircular block 26, a left positioning piece 27, a screw 28 and a fourth pin 29; the semicircular block 26 is fixed on the positioning plate 10 through two fourth pins 29 and two screws 28, and the left positioning piece 27 and the right positioning piece 25 are fixed on the left side surface and the right side surface of the positioning plate 10 through two third pins 23 and two third screws 24 respectively; after the left inclined plane and the right inclined plane of the wedge-shaped groove are machined, the size of the left side face of the left positioning piece 27 and the size of the inner side face of the left side of the wedge-shaped groove of the main connecting rod meet the size and tolerance requirements of 45 degrees, the size of the right side face of the right positioning piece 25 and the size of the inner side face of the right side of the wedge-shaped groove of the main connecting rod meet the size and tolerance requirements of 45 degrees, the size requirements and the position degree requirements of the left inclined plane and the right inclined plane of the wedge-shaped groove on the center of a large tile hole are guaranteed, and the size from the top face of the main connecting rod serving as a reference to the top face of the semicircular block 26 is 22mm serving as a size standard for measuring the depth of the inclined plane of the wedge-shaped groove in the machining process;
the tool setting device comprises a fifth pin 30, a tool setting block 31 and a fourth screw 32; the feeler block 31 is fixed on the positioning plate 10 through two fifth pins 30 and two fourth screws 32, and the grinding wheel is corrected by taking the feeler block 31 as a reference;
the workpiece positioning and clamping device comprises a first wire pair 34, a fourth nut 35, a first detachable washer 36, a supporting stepped shaft 37, a diamond-shaped pin 38, a fifth screw 39, a second wire pair 40, a fifth nut 41, a second detachable washer 42, a sector plate 43, a sixth screw 44 and a cylindrical pin 45; the sector plate 43 is fixed on the positioning plate 10 through four sixth screws 44, a small cylinder on the left side of the supporting stepped shaft 37 is inserted into a positioning hole of the positioning plate 10 and is fastened through four fifth screws 39, an inner hole of the diamond pin 38 and a cylinder on the right side of the supporting stepped shaft 37 are connected together in an interference fit manner, the first wire pair 34 is fastened in a threaded hole on the top surface of the supporting stepped shaft 37 in a threaded manner, the cylindrical pin 45 is inserted into a round hole of the positioning plate 10 in an interference fit manner, and the second wire pair 40 penetrates through a round hole of the semicircular block 26 and is fixed in a corresponding threaded hole of the positioning plate 10 in a threaded manner; the main connecting rod lug hole and the small end hole are respectively arranged on the cylindrical pin 45 and the diamond-shaped pin 38, the end surface of the main connecting rod large tile hole and the end surface of the small end hole are respectively attached to the front end surfaces of the sector plate 43 and the supporting stepped shaft 37, the second detachable washer 42 penetrates through the second screw pair 40, the fifth nut 41 is screwed on the second screw pair 40, the fifth nut 41 is screwed to fasten the main connecting rod large tile hole, the first detachable washer 36 penetrates through the first screw pair 34 to be arranged in the first detachable washer 36, then the fourth nut 35 is screwed on the first screw pair 34, the fourth nut 35 is screwed to fasten the small end of the main connecting rod, and the clamping work of the main connecting rod is completed.
The lubricating system comprises an oil injector, the lubricating system is arranged in a small hole formed in the body 1 in an interference fit mode, and the small hole is aligned with the small hole in the radial direction of the bushing 8.
When the clamp works, a workpiece main connecting rod is arranged on the clamp, the main connecting rod is respectively arranged on a cylindrical pin 45 and a diamond-shaped pin 38 through an ear hole and a small head hole, the end surface of a large tile hole and the end surface of a small head hole of the main connecting rod are respectively positioned with the planes of a sector plate 43 and a supporting stepped shaft 37, and the workpiece is positioned and clamped through a second detachable washer 42, a second screw pair 40, a fifth screw cap 41, a first detachable washer 36, a first screw pair 34 and a fourth screw cap 35; the operating nut 3 is loosened through the handle 2, the knurled nut 18 is rotated clockwise to drive the stepped screw 20 to rotate, the circular nut 12 moves linearly to drive the support column 13 to drive the positioning plate 10 to rotate anticlockwise around the rotating shaft 7 until the upper half supporting pin 17 is tightly contacted with the adjusting screw 15, then the operating nut 3 is screwed through the handle 2, and the first accurate positioning is completed; the operating nut 3 is loosened through the handle 2, the knurled nut 18 is rotated anticlockwise to drive the stepped screw 20 to rotate, the circular nut 12 moves linearly to drive the support column 13 to drive the positioning plate 10 to rotate clockwise around the rotating shaft 7 until the lower half supporting pin 17 is tightly contacted with the adjusting screw 15, then the operating nut 3 is screwed through the handle 2, and the secondary accurate positioning is completed; after the workpiece is machined, the fourth nut 35 and the fifth nut 41 are loosened, the second detachable washer 42 and the first detachable washer 36 are detached from the jig, the workpiece is taken out of the jig, and the workpiece machining is completed.
(III) advantageous effects
The high-efficiency accurate positioning clamp provided by the technical scheme ensures the size precision and the surface quality of the inclined plane processing of the wedge-shaped groove of the main connecting rod, solves the problem of the position precision of the inclined planes on the two sides of the wedge-shaped groove of the main connecting rod to the center of a large tile hole, improves the processing quality of parts, reduces the labor intensity, improves the production efficiency and meets the processing requirements of high efficiency and high precision.
Drawings
FIG. 1 is a schematic view of a master link assembly.
FIG. 2 is a schematic view of a fine positioning apparatus.
Fig. 3 is a schematic view of a measuring apparatus.
Fig. 4 is a schematic view of a tool setting device.
Fig. 5 is a schematic view of a lubrication system.
Fig. 6 is a schematic view of a workpiece positioning and clamping device.
Fig. 7 is a schematic diagram of the operation of the clamp.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The invention relates to a high-efficiency accurate positioning fixture for machining a main connecting rod of a four-stroke high-efficiency high-power diesel engine, which comprises: the device comprises five parts, namely a precise positioning device, a measuring device, a tool setting device, a lubricating system and a workpiece positioning and clamping device.
As shown in fig. 2, the precise positioning device comprises a body 1, a handle 2, an operating nut 3, a first nut 4, a first screw 5, a first washer 6, a rotating shaft 7, a bushing 8, a second screw 9, a positioning plate 10, a first pin 11, a round nut 12, a support column 13, a fork 14, an adjusting screw 15, a second nut 16, a support pin 17, a knurled nut 18, a second pin 19, a stepped screw 20, a second washer 21 and a third nut 22;
the bushing 8 is arranged in an inner hole of the body 1 in an interference fit mode, the rotating shaft 7 and the positioning plate 10 are fixed together through positioning of two first pins 11 and fastening of six second screws 9, the fixed rotating shaft 7 and the positioning plate 10 penetrate through the inner hole of the bushing 8 from the left side and are arranged on the body 1, the first washer 6 is arranged on the rotating shaft 7 from the right side of the rotating shaft 7, the operating nut 3 is screwed on the rotating shaft 7 through threads, the three handles 2 are screwed on the operating nut 3 through threads, the first nut 4 is arranged on the rotating shaft 7 through threads behind the operating nut 3, a gap of 0.5mm is reserved between the operating nut 3 and the first nut 4, and the first screw 5 is arranged on the first nut 4 and limits the first nut 4; the support post 13 is arranged on the positioning plate 10 from the front and the side through two pins and three screws, and the support pin 17 is arranged on the support post 13 from the upper direction and the lower direction through slight interference fit; the fork 14 is fixed to the body 1 by means of two pins and two screws, the second nut 16 is screwed onto the adjusting screw 15, then two adjusting screws 15 are arranged on the fork 14 from the upper direction and the lower direction through threads, a second pin 19 penetrates through small holes at the tops of the knurled screw cap 18 and the screw rod 20 and is connected together in an interference fit manner, the cylindrical screw cap 12 is arranged in a round hole at the front surface of the supporting column 13, the connected body of knurled nut 18 and threaded rod 20 is then passed through the upper hole of fork 14, through a circular nut 12 fitted in a circular hole in the front face of the post 13 by means of a screw connection and then through a lower hole of the fork 14, the bottom of the screw 20 is fitted with a second washer 21, two identical third nuts 22 are mounted by means of a threaded connection under the second washer 21, ensuring a clearance of 1mm between the second washer 21 and the lower end face of the fork 14, and ensuring a rotational movement of the screw 20 in the fork 14 and the column 13.
Clockwise rotation annular knurl nut 18 drives ladder screw rod 20 and rotates, 20 terminal surfaces of ladder screw rod and fork 14 go up the plane contact, rotary motion is done to the ladder screw rod, it makes the straight line motion that makes progress to drive the circular nut 12 of dress in pillar 13 round hole, pillar 13 is rotary motion through axis of rotation 7, until first one support pin 17 and stop screw 15 in close contact with, screw up operation nut 3 through handle 2, accurate positioning is accomplished for the first time, guarantee the right flank of main connecting rod wedge groove and the drawing dimensional requirement of top surface 89.88 degrees. Anticlockwise rotation annular knurl nut 18 drives ladder screw rod 20 and rotates, plane contact under second packing ring 21 up end and the fork 14, rotary motion is done to the ladder screw rod, it is downward rectilinear motion to drive the circular nut 12 of dress in pillar 13 round hole, pillar 13 is rotary motion through axis of rotation 7, until lower half supporting pin 17 and stop screw 15 in close contact with, screw up operation nut 3 through handle 2, the accurate positioning of second time is accomplished, guarantee the drawing dimensional requirement of the right flank and the top surface 89.88 degrees of main connecting rod wedge groove.
The measuring device is composed of a third pin 23, a third screw 24, a right positioning piece 25, a semicircular block 26, a left positioning piece 27, a fourth screw 28 and a fourth pin 29, as shown in fig. 3.
The semicircular block 26 is fixed on the positioning plate 10 by two fourth pins 29 and two fourth screws 28, and the left positioning member 27 and the right positioning member 25 are fixed on the left and right side surfaces of the positioning plate 10 by two third pins 23 and two third screws 24, respectively.
After the wedge groove left and right inclined planes are processed, the size and tolerance requirements of 45 are met by measuring the size of the left side surface of the left positioning piece 27 and the size of the inner side surface of the left side of the wedge groove of the main connecting rod, the size and tolerance requirements of 45 are met by the size of the right side surface of the right positioning piece 25 and the size and tolerance requirements of the right inner side surface of the wedge groove of the main connecting rod, so that the size and position degree requirements of the left and right inclined planes of the wedge groove on the center of a large tile hole are met, the size from the top surface of the main connecting rod to the top surface of the semicircular block 26 is 22mm by using the special correcting measuring tool, and the size standard of the depth of the inclined plane of the wedge groove is measured in the processing process.
The tool setting device consists of a fifth pin 30, a tool setting block 31 and a fifth screw 32. As shown in fig. 4.
The feeler block 31 is fixed on the positioning plate 10 through two fifth pins 30 and two fifth screws 32, and the grinding wheel is corrected by taking the feeler block 31 as a reference, so that the requirement of the dimensional tolerance of the wedge groove depth of 22mm is ensured.
The axis of rotation 7 can produce the resistance because of the effect of frictional force when rotating in bush 8, and this anchor clamps are equipped with lubricating arrangement for the nimble reliable of rotation process, and the oiler that will purchase outward is held unanimously through interference fit dress in the aperture of body 1 and the radial ascending aperture of bush 8, and the oiler comprises ball, spring, oil filler point, as shown in fig. 5.
The workpiece positioning and clamping device consists of a first wire pair 34, a fourth nut 35, a first washer 36, a supporting stepped shaft 37, a diamond-shaped pin 38, a sixth screw 39, a second wire pair 40, a fifth nut 41, a second washer 42, a sector plate 43, a seventh screw 44 and a cylindrical pin 45. As shown in fig. 6.
The sector plate 43 is fixed on the positioning plate 10 through four seventh screws 44, a small cylinder supporting the left side of the stepped shaft 37 is inserted into a positioning hole of the positioning plate 10 and is fastened by four sixth screws 39, an inner hole of the diamond pin 38 and a cylinder supporting the right side of the stepped shaft 37 are connected together in an interference fit manner, the first wire pair 34 is fastened in a threaded hole on the top surface of the supporting stepped shaft 37 in a threaded manner, the cylindrical pin 45 is inserted into a round hole of the positioning plate 10 in an interference fit manner, and the second wire pair 40 penetrates through a round hole of the semicircular block 26 and is fixed in a corresponding threaded hole of the positioning plate 10 in a threaded manner. The main connecting rod lug hole and the small end hole are respectively arranged on the cylindrical pin 45 and the diamond pin 38, the end surface of the main connecting rod large tile hole and the end surface of the small end hole are respectively attached to the sector plate 43 and the front end surface of the supporting stepped shaft 37, the second washer 42 is arranged in the second washer after penetrating through the second screw pair 40, the fifth nut 41 is screwed on the second screw pair 40, and the fifth nut 41 is screwed to fasten the main connecting rod large tile hole. And a first washer 36 is arranged through the first screw pair 34, then a fourth nut 35 is screwed on the first screw pair 34, and the fourth nut 35 is screwed to fasten the small end of the main connecting rod, so that the clamping work of the main connecting rod is completed.
During the working process of the clamp, a workpiece main connecting rod is arranged on the clamp, the main connecting rod is respectively arranged on the cylindrical pin 45 and the diamond-shaped pin 38 through the ear hole and the small head hole, the end face of the large tile hole and the end face of the small head hole of the main connecting rod are respectively positioned with the planes of the sector plate 43 and the supporting stepped shaft 37, and the workpiece is positioned and clamped through the second washer 42, the second screw pair 40, the fifth nut 41, the first washer 36, the first screw pair 34 and the fourth nut 35. Loosen operation nut 3 through handle 2, clockwise rotation annular knurl nut 18 drives ladder screw 20 and is rotary motion, linear motion is made to circular nut 12, it drives locating plate 10 and is anticlockwise rotation (the main connecting rod presss from both sides tightly on the locating plate) to drive pillar 13 round axis of rotation 7, until first supporting pin 17 and stop screw 15 in close contact with, then screw up operation nut 3 through handle 2, first accurate positioning is accomplished, guarantee the right flank of main connecting rod wedge groove and the requirement of drawing size precision and the roughness of surface 89.88 degrees of top surface.
The accurate positioning device ensures the dimensional accuracy and the surface quality of the wedge-shaped groove inclined surface processing of the main connecting rod; the measuring device solves the problem of position accuracy of inclined planes on two sides of the wedge-shaped groove of the main connecting rod to the center of the large tile hole, improves the processing quality of parts, reduces the labor intensity and improves the production efficiency. The high-efficiency and high-precision machining requirements are met.
Through production verification, the clamp is convenient to use, quick to clamp and high in machining precision and production efficiency, the machining qualification rate of the wedge-shaped groove inclined surface of the main connecting rod is guaranteed to be 100%, the production efficiency is 120 minutes after the original machining, 10 minutes are needed when the grinding machine clamp is used for machining at present, and the machining efficiency is improved by 91.6% on the original basis.
The invention is applied to the batch production of the main connecting rod wedge groove of a certain type of four-stroke high-efficiency high-power diesel engine, and creates the economic benefit of tens of thousands yuan from the aspects of saving the production time and improving the analysis of the processing yield of the main connecting rod wedge groove. The invention of the high-efficiency high-precision positioning fixture for machining the wedge-shaped groove of the main connecting rod not only provides a technical reference for manufacturing the wedge-shaped groove of the main connecting rod of other models of diesel engines or parts with the same structure, but also provides technical storage for designing the parts fixtures with the same structure of future diesel engines.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. An efficient accurate positioning fixture, comprising: the device comprises a precise positioning device, a measuring device, a tool setting device and a workpiece positioning and clamping device;
the accurate positioning device comprises a body (1), a handle (2), an operating nut (3), a first nut (4), a first screw (5), a first gasket (6), a rotating shaft (7), a bushing (8), a second screw (9), a positioning plate (10), a first pin (11), a circular nut (12), a support column (13), a fork (14), an adjusting screw (15), a second nut (16), a support pin (17), a knurled nut (18), a second pin (19), a stepped screw (20), a second gasket (21) and a third nut (22); the bushing (8) is arranged in an inner hole of the body (1) in an interference fit manner, the rotating shaft (7) and the positioning plate (10) are fixed together by two first pins (11) and six second screws (9) which are fastened, the fixed rotating shaft (7) and the positioning plate (10) penetrate through the inner hole of the bushing (8) from the left side and are arranged on the body (1), the first gasket (6) is arranged on the rotating shaft (7) from the right side of the rotating shaft (7), the operating nut (3) is screwed on the rotating shaft (7) through threads, the three handles (2) are screwed on the operating nut (3) through threads, the first nut (4) is arranged on the rotating shaft (7) through threads behind the operating nut (3), a gap of 0.5mm is reserved between the operating nut (3) and the first nut (4), and the first screw (5) is arranged on the first nut (4), the first screw cap (4) is limited; the supporting column (13) is arranged on the positioning plate (10) from the front and the side through two pins and three screws, and the supporting pin (17) is arranged on the supporting column (13) from the upper direction and the lower direction through slight interference fit; the fork (14) is fixed on the body (1) through two pins and two screws, a second nut (16) is arranged on the adjusting screw (15) through threads, then the two adjusting screws (15) are arranged on the fork (14) through threads from the upper direction and the lower direction, a second pin (19) penetrates through small holes at the tops of the knurled nut (18) and the stepped screw (20) and is connected together in an interference fit manner, the circular nut (12) is arranged in a round hole at the front of the pillar (13), then a connecting body of the knurled nut (18) and the stepped screw (20) which are connected together penetrates through an upper hole of the fork (14) and penetrates through the circular nut (12) assembled in the round hole at the front of the pillar (13) through a lower hole of the fork (14) through a threaded connection, a second washer (21) is sleeved at the bottom of the stepped screw (20), and two identical third nuts (22) are arranged below the second washer (21) through the threaded connection, a gap of 1mm is reserved between the second gasket (21) and the end face of the lower part of the fork (14), so that the stepped screw rod (20) rotates in the fork (14) and the support (13);
the knurling nut (18) is rotated clockwise to drive the stepped screw rod (20) to rotate, the end face of the stepped screw rod (20) is in contact with the upper plane of the fork (14), the stepped screw rod rotates to drive the circular nut (12) arranged in the circular hole of the support column (13) to move upwards in a straight line, the support column (13) rotates through the rotating shaft (7) until the upper half supporting pin (17) is in close contact with the adjusting screw (15), the operating nut (3) is screwed through the handle (2), and the first accurate positioning is completed; the knurled nut (18) is rotated anticlockwise to drive the stepped screw rod (20) to rotate, the upper end face of the second gasket (21) is in contact with the lower plane of the fork (14), the stepped screw rod rotates to drive the circular nut (12) arranged in the circular hole of the support column (13) to do downward linear motion, the support column (13) rotates through the rotating shaft (7) until the lower half supporting pin (17) is in tight contact with the adjusting screw (15), the operating nut (3) is screwed through the handle (2), and the second accurate positioning is completed;
the measuring device comprises a third pin (23), a third screw (24), a right positioning piece (25), a semicircular block (26), a left positioning piece (27), a screw (28) and a fourth pin (29); the semicircular block (26) is fixed on the positioning plate (10) through two fourth pins (29) and two screws (28), and the left positioning piece (27) and the right positioning piece (25) are respectively fixed on the left side surface and the right side surface of the positioning plate (10) through two third pins (23) and two third screws (24); after the left inclined plane and the right inclined plane of the wedge-shaped groove are machined, the size of the left side face of the left positioning piece (27) and the size of the inner side face of the left side of the wedge-shaped groove of the main connecting rod meet the size and tolerance requirements of 45 degrees, the size of the right side face of the right positioning piece (25) and the size of the inner side face of the right side of the wedge-shaped groove of the main connecting rod meet the size and tolerance requirements of 45 degrees, the size requirements and the position degree requirements of the left inclined plane and the right inclined plane of the wedge-shaped groove on the center of a large tile hole are guaranteed, and the size from the top face of the main connecting rod serving as a reference to the top face of the semicircular block (26) is 22mm and serves as a size standard for measuring the depth of the wedge-shaped groove inclined plane in the machining process;
the tool setting device comprises a fifth pin (30), a tool setting block (31) and a fourth screw (32); the feeler block (31) is fixed on the positioning plate (10) through two fifth pins (30) and two fourth screws (32), and the grinding wheel is corrected by taking the feeler block (31) as a reference;
the workpiece positioning and clamping device comprises a first screw pair (34), a fourth screw cap (35), a first detachable washer (36), a supporting stepped shaft (37), a diamond-shaped pin (38), a fifth screw (39), a second screw pair (40), a fifth screw cap (41), a second detachable washer (42), a sector plate (43), a sixth screw (44) and a cylindrical pin (45); the sector plate (43) is fixed on the positioning plate (10) through four sixth screws (44), a small cylinder on the left side of the supporting stepped shaft (37) is inserted into a positioning hole of the positioning plate (10) and is fastened through four fifth screws (39), an inner hole of the diamond-shaped pin (38) is connected with a cylinder on the right side of the supporting stepped shaft (37) through interference fit, the first wire pair (34) is fastened in a threaded hole on the top surface of the supporting stepped shaft (37) through threaded connection, the cylindrical pin (45) is inserted into a round hole of the positioning plate (10) through interference fit, and the second wire pair (40) penetrates through a round hole of the semicircular block (26) and is fixed in a corresponding threaded hole of the positioning plate (10) through threaded connection; the main connecting rod lug hole and the small head hole are respectively arranged on a cylindrical pin (45) and a diamond-shaped pin (38), the end face of a large tile hole and the end face of a small head hole of the main connecting rod are respectively attached to a sector plate (43) and the front end face of a supporting stepped shaft (37), a second detachable washer (42) penetrates through a second screw pair (40), a fifth nut (41) is screwed into the second screw pair (40), the fifth nut (41) is screwed to fasten the large tile hole of the main connecting rod, a first detachable washer (36) penetrates through a first screw pair (34), then a fourth nut (35) is screwed into the first screw pair (34), the fourth nut (35) is screwed to fasten the small head end of the main connecting rod, and the clamping work of the main connecting rod is completed.
2. An efficient and accurate positioning fixture as claimed in claim 1, further comprising a lubrication system comprising an oil injector, wherein the lubrication system is arranged in a small hole formed in the body (1) in an interference fit manner, and the small hole is aligned with the small hole in the radial direction of the bushing (8).
3. The efficient precise positioning fixture as claimed in claim 2, wherein when the fixture is in operation, the workpiece main connecting rod is arranged on the fixture, the main connecting rod is respectively arranged on the cylindrical pin (45) and the diamond-shaped pin (38) through the ear hole and the small head hole, the end face of the main connecting rod large tile hole and the end face of the small head hole are respectively positioned with the planes of the sector plate (43) and the supporting stepped shaft (37), and the workpiece is positioned and clamped through the second detachable washer (42), the second wire pair (40), the fifth nut (41), the first detachable washer (36), the first wire pair (34) and the fourth nut (35); the operating nut (3) is loosened through the handle (2), the knurled nut (18) is rotated clockwise to drive the stepped screw (20) to do rotary motion, the circular nut (12) does linear motion, the supporting column (13) is driven to drive the positioning plate (10) to do anticlockwise rotation around the rotating shaft (7) until the upper half supporting pin (17) is in tight contact with the adjusting screw (15), then the operating nut (3) is screwed through the handle (2), and the first accurate positioning is completed; the operating nut (3) is loosened through the handle (2), the knurled nut (18) is rotated anticlockwise to drive the stepped screw (20) to rotate, the circular nut (12) moves linearly to drive the support post (13) to drive the positioning plate (10) to rotate clockwise around the rotating shaft (7) until the lower half supporting pin (17) is in close contact with the adjusting screw (15), then the operating nut (3) is screwed through the handle (2), and the secondary accurate positioning is completed; and after the workpiece is machined, loosening the fourth nut (35) and the fifth nut (41) to detach the second detachable washer (42) and the first detachable washer (36) from the clamp, taking the workpiece out of the clamp, and finishing machining the workpiece.
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| CN201911399113.2A CN110900451B (en) | 2019-12-30 | 2019-12-30 | High-efficient accurate positioning fixture |
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| CN201911399113.2A CN110900451B (en) | 2019-12-30 | 2019-12-30 | High-efficient accurate positioning fixture |
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| CN110900451B true CN110900451B (en) | 2021-08-27 |
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