CN107877024B - Cutting edge grinding device for grass cutting hob and grinding method thereof - Google Patents
Cutting edge grinding device for grass cutting hob and grinding method thereof Download PDFInfo
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- CN107877024B CN107877024B CN201711373874.1A CN201711373874A CN107877024B CN 107877024 B CN107877024 B CN 107877024B CN 201711373874 A CN201711373874 A CN 201711373874A CN 107877024 B CN107877024 B CN 107877024B
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- hob
- grinding wheel
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- welding
- seat
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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
- B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
- B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
- B24B3/365—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of rotary mower blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
- B23K31/025—Connecting cutting edges or the like to tools; Attaching reinforcements to workpieces, e.g. wear-resisting zones to tableware
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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
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
Abstract
The invention discloses a cutting edge grinding device of a grass cutting hob and a grinding method thereof, belonging to the field of lawn machinery cutter processing. The device comprises a grinding wheel mechanism, wherein the grinding wheel mechanism comprises a fixed supporting component, a movable supporting component and a grinding wheel component; the fixed support assembly comprises a fixed support and a first support plate arranged on the fixed support, and the first support plate is provided with a first bearing hole; the movable support assembly comprises a movable support seat, a second support plate and a motor, wherein the movable support seat is arranged on the guide rail in a sliding manner, the second support plate is arranged on the movable support seat and is provided with a second bearing hole, and the motor is connected with the movable support seat through a screw nut pair; the grinding wheel assembly comprises a grinding wheel seat, a grinding wheel and a follow-up pressing plate, wherein the grinding wheel and the follow-up pressing plate are arranged on the grinding wheel seat, the follow-up pressing plate is positioned below the grinding wheel, and the grinding wheel is driven by a grinding wheel motor. The device has a simple and ingenious structure, and can grind the spiral hob blade.
Description
Technical Field
The invention belongs to the field of lawn machinery cutter processing, and particularly relates to a cutter edge grinding device of a grass cutting hob and a grinding method thereof.
Background
Along with the improvement of living standard, the requirements of people on living greening level are higher and higher, and urban large ecological greenbelts, residential greenbelts, road greenbelts and the like are continuously increased, so that various mowing machines are also continuously pushed out, wherein the hob-type mowing machine (also called a mowing machine, a lawn mower) is favored by users due to the advantages of light weight, small size, flexible operation and the like.
The principle of the mower for realizing cutting is that grass is rolled up by a hob and weeds are cut off by a blade positioned on the hob. The hob of the mower comprises a hob shaft, cutterheads and hob blades, wherein the hob assembly sequence is to firstly pass a plurality of cutterheads on the hob shaft at intervals, and weld and fix the cutterheads, then insert the hob blades into slots of the cutterheads to weld and fix the hob blades, finally grind the cutting edges, and the hob blades are spiral.
The rolling blade is spiral, so that the requirement on the relative rotation angle between the cutterheads on the rolling cutter shaft is high, the rolling blade can be smoothly inserted into the slot of the cutterhead, and the requirement on the positioning precision of the blade on the rolling cutter shaft is high. As such, the inventors have previously devised a welding fixture for a grass cutting hob, which corresponds to the patent number: 201611023786.4, publication date: 15 days of 2017 2 months, the welding fixture
The device comprises a base and a plurality of supporting plates, wherein the supporting plates are vertically and equidistantly arranged on the base; one side of each supporting plate is provided with a cutterhead positioning block, and the cutterhead positioning blocks correspond to the positioning holes; the tops of the supporting plates are provided with a main shaft positioning groove; the main shaft positioning grooves are semicircular grooves and are all on the same axis; and the cutter disc positioning blocks are projected onto the same plane to form an array which takes the projection point of the center of the semicircular groove on the same plane as a central point.
The tool head can be rapidly positioned on the main shaft in position and angle through the welding tool, then the tool head is welded on the main shaft through manual welding, and meanwhile, the scheme also provides a corresponding welding method. However, it does not provide a method how the hob pieces are welded on the cutterhead, because only after the cutterhead is positioned on the main shaft, the hob pieces are directly inserted into the slots on the cutterhead, and the hob pieces are manually welded, which is a relatively traditional and simple mode and has no innovation. However, long-term practical welding operation shows that the mode is extremely inconvenient, the efficiency is low, the welding quality is difficult to ensure, secondary and even multiple reworking are often needed, and the scrapping situation is occasionally caused, because the hob is wholly cylindrical, each hob blade is circumferentially and uniformly distributed on the hob head, the space between adjacent hob blades is narrow, a worker holds a welding gun in the small space to weld the hob head extremely difficultly, the visual field is severely blocked, the hob blade is spiral, the welding gun also needs to continuously change the welding angle along with the trend of a welding line, the welding difficulty is larger, the welding defects such as broken welding, welding tumor and uneven welding line are often caused, and the quality of hob products is greatly reduced.
Other prior art devices have involved hob processing, but rarely are directed to hob blade welding, for example, chinese patent application No.: 201610791977.9, publication date: patent literature on 2017, 1 month and 4 days discloses a hob blade inserting device of a hob cutter of a mower, which comprises a bracket, a hob shaft fixing device, a lifting frame and a hob device, wherein a plurality of clamping devices are arranged on the lifting frame, the clamping devices are spirally distributed around an assembly station from top to bottom and form a processing space for accommodating a semi-finished product to be processed in the center, an inserting driving mechanism for driving the corresponding clamping devices to horizontally move back and forth towards a spiral central axis is arranged between each clamping device and the lifting frame, the lifting frame vertically moves up and down under the driving of the lifting mechanism, and the hob shaft fixing device is used for fixing a vertical hob shaft and can drive the hob shaft to rotate. According to the scheme, the assembly of the hob blade and the hob frame can be automatically completed, the automation degree of hob blade installation is improved, but the hob blade is still required to be welded after being installed, and a corresponding welding method is not provided.
In addition, the prior hob is generally and directly ground with a cutting edge after being assembled and welded, the whole hob is not attractive, the cutting edge is not wear-resistant, the hob is easy to be dulled after being used for a period of time, the hob needs to be ground, the corrosion resistance is weak, the hob is easy to rust after being placed for a long time, and the like. The blade of the rolling blade is spiral, and the post-welding grinding is difficult, so that no special grinding equipment exists at present.
Disclosure of Invention
1. Problems to be solved
The invention provides a robot welding device for a grass cutting hob, and aims to solve the problems of low welding efficiency and poor welding quality caused by narrow welding space and blocked visual field in the conventional manual welding of a hob blade. The welding device is matched auxiliary equipment for welding by adopting a robot, can be matched with the welding robot to rapidly finish the welding between the rolling blade and the cutter head, can finish all the welding by one-time clamping, and has high automation degree, high welding efficiency and good welding quality.
The invention also provides a method for welding the grass cutting hob, the assembled hob is clamped on a welding device at one time, and the welding of the hob blade is completed efficiently and with high quality by matching with a welding robot.
2. Technical proposal
In order to solve the problems, the invention adopts the following technical scheme.
The utility model provides a cut grass hobbing cutter cutting edge grinding device, includes grinding wheel mechanism, grinding wheel mechanism includes fixed support subassembly, movable support subassembly and grinding wheel subassembly; the fixed support assembly comprises a fixed support and a first support plate arranged on the fixed support, and the first support plate is provided with a first bearing hole; the movable support assembly comprises a movable support seat, a second support plate and a motor, wherein the movable support seat is arranged on the guide rail in a sliding manner, the second support plate is arranged on the movable support seat and is provided with a second bearing hole, and the motor is connected with the movable support seat through a screw nut pair; the grinding wheel assembly comprises a grinding wheel seat, a grinding wheel and a follow-up pressing plate, wherein the grinding wheel and the follow-up pressing plate are arranged on the grinding wheel seat, the follow-up pressing plate is positioned below the grinding wheel, and the grinding wheel is driven by a grinding wheel motor.
As a further improvement, the front end of the follow-up pressing plate is provided with a ball.
As a further improvement, the grinding wheel assembly is mounted on the translation mechanism; the translation mechanism comprises a Y-axis guide rail and a Y-axis sliding seat arranged on the Y-axis guide rail, and the Y-axis sliding seat is connected with a Y-axis motor through a screw nut pair; the grinding wheel seat is arranged on the Y-axis sliding seat through the linear guide rail pair, and the grinding wheel seat is also connected with the Y-axis sliding seat through the screw nut pair.
The grinding method of the grass cutting hob blade comprises the following operation steps of:
firstly, sleeving bearings on bearing sections at two ends of a hob shaft, and driving a movable support to move through a motor, so that the bearings at two ends of the hob shaft are respectively installed into a first bearing hole of a first supporting plate and a second bearing hole of a second supporting plate; then, the grinding wheel seat moves to one end of the hob blade, the grinding wheel seat is made to approach the hob blade, the hob blade is inserted between the grinding wheel and the follow-up pressing plate, the grinding wheel is contacted with the upper side surface of the hob blade, and the ball at the front end of the follow-up pressing plate is contacted with the lower side surface of the hob blade; then, a grinding wheel motor is started, the grinding wheel grinds the hob, the hob shaft rotates under the limit of the grinding wheel and the follow-up pressing plate along with the axial movement of the grinding wheel seat along the hob shaft, and the grinding wheel grinds the cutting edge along the hob.
As a further improvement, after the grinding wheel seat moves from one end of the cutter shaft to the other end to finish grinding once, grinding is reversely performed again, and after the grinding is performed twice, a corresponding cutter edge surface is processed.
As a further improvement, a welding robot is adopted to weld the hob blade on the cutterhead, and then the grinding processing of the hob blade edge is carried out.
As a further improvement, when the hob blade is welded, the hob is fixed by a robot welding device for cutting the hob, and then the hob is welded by a welding robot; the robot welding device of the grass cutting hob comprises a stand, and a driving mechanism and a jacking mechanism which are oppositely arranged left and right on the stand; the driving mechanism comprises a motor case, a chuck and a first thimble, the chuck is driven by a first motor in the motor case, and the first thimble is arranged on the chuck; the jacking mechanism comprises a jacking seat, a jacking cylinder and a jacking plate, wherein the jacking seat is arranged on a track fixed on the machine base in a sliding manner, the jacking cylinder is fixed on the jacking seat, the jacking seat is connected with the jacking plate, and a second thimble coaxial with the first thimble is arranged on the jacking plate.
As a further improvement, the robot welding device of the grass cutting hob also comprises a material supporting mechanism positioned between the driving mechanism and the jacking mechanism; the material supporting mechanism comprises a material supporting seat, a material supporting cylinder and a material supporting plate which are arranged on the machine base; the material supporting cylinder is arranged on the material supporting seat and is connected with the material supporting plate to drive the material supporting plate to move up and down.
As a further improvement, the machine base is provided with a locking rod, and the locking rod is provided with a plurality of locking holes along the length direction; the tightening seat is provided with an ear plate, and the ear plate can be fixedly connected with the locking rod by inserting the locking pin into the locking hole.
As a further improvement, the hob plate is welded on the cutterhead, and the operation steps are as follows:
(1) sequentially mounting hob blades into slots on a cutterhead, and fixing the hob blades;
(2) placing the hob on a material supporting plate of a material supporting mechanism, and adjusting the height of the material supporting plate by a material supporting cylinder to enable a hob shaft of the hob to be coaxial with the first thimble and enable the first thimble to be jacked into a jacking hole at one end of the hob shaft;
(3) the jacking mechanism approaches the driving mechanism along the track, the jacking cylinder pushes the second thimble to jack into a thimble hole at the other end of the hob shaft, the hob is jacked, and the positioning pin is ensured to be inserted into a positioning hole of the cutterhead; simultaneously, the material supporting cylinder drives the material supporting plate to descend and withdraws the material supporting plate;
(4) inserting a locking pin into a locking hole on the locking rod to lock the position of the jacking seat;
(5) the welding robot is adopted to fillet weld the juncture of the hob slice and the cutterhead on the hob, and the cutterheads from one end of the hob shaft to the other end are welded one by one; after welding the welding positions of two adjacent hob pieces on one cutterhead, the driving mechanism acts to drive the rolling rotation 720/n DEG, n is the number of hob pieces, until all the welding positions of the hob pieces on the same cutterhead are welded, the welding robot moves to the next cutterhead for welding, and so on until the welding is completed.
As a further improvement, in the step (1), the fixing is carried out from the two ends and/or the middle part of the hob by packing steel belts or hoops.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) The robot welding device for the grass cutting hob is special matched equipment for welding hob pieces of the grass cutting hob by a robot, can clamp and position at one time, can control the hob to rotate by corresponding angles according to welding steps according to different welding points, and meets the requirement of point-to-point welding of the robot; the robot replaces manual welding, the problems of narrow welding space and limited welding field of adjacent rolling blades are completely avoided, the welding efficiency is improved by tens of times compared with manual welding, the welding seam is even and full, the quality is good, and the connection strength of the hob and the cutterhead is enhanced.
(2) The robot welding device for the grass cutting hob has the advantages that the position of the locating pin in the jacking mechanism in the adjusting groove of the jacking plate is adjustable, the robot welding device can adapt to hob welding positioning of different types and sizes, and the adaptability is high.
(4) According to the robot welding device for the grass cutting hob, the material supporting mechanism is used for feeding, the hob shaft of the hob is adjusted to be equal to the axis of the thimble, the thimble can conveniently prop the hob shaft from the two ends of the hob shaft, and therefore manual feeding is not needed, time and labor are saved, and operation safety is improved.
(5) According to the robot welding device for the grass cutting hob, the position of the propping mechanism is locked through the locking rod, so that the hob is prevented from shaking or even falling due to the fact that the propping mechanism is retreated and loosened in the hob rotating process, and the welding stability and safety are improved.
(6) According to the welding method of the grass cutting hob, the robot welding device of the grass cutting hob is matched with the welding robot to weld hob pieces, the operation is simple, the degree of automation is high, the welding operation can be completed rapidly and efficiently, and the welding quality is high.
(7) According to the welding method of the grass cutting hob, the welding positions of two adjacent hob blades on the same hob head are selected for welding each time, so that the welding method is the best welding mode limited by the welding space, the welding efficiency can be improved, and the welding process of a welding robot is convenient to simplify.
(8) According to the welding method of the grass cutting hob, the grinding wheel mechanism is adopted to grind the edge of the hob blade, the hob blade is limited between the grinding wheel and the follow-up pressing plate through ingenious matching of the grinding wheel and the follow-up pressing plate, and the hob blade can be driven to rotate along with axial movement of the grinding wheel along the hob shaft, so that the grinding wheel grinds the edge of the hob blade, the structure is very simple, but also very ingenious, and the grinding difficulty of the edge of the hob blade of a spiral hob blade is greatly simplified; the front end of the follow-up pressing plate is provided with the wear-resistant ball, so that friction between the follow-up pressing plate and the hob plate can be reduced, abrasion of the follow-up pressing plate is reduced, and long-term machining blade accuracy is guaranteed.
(9) According to the method for processing the grass cutting hob, the processed grass cutting hob has strong wear resistance and corrosion resistance, and has attractive appearance.
Drawings
FIG. 1 is a schematic perspective view of a grass cutting hob;
FIG. 2 is an enlarged end view of the grass cutting hob;
FIG. 3 is a schematic front view of a robotic welding device for a grass cutting hob of the present invention;
FIG. 4 is a schematic top view of a robotic welding device for a grass cutting hob of the present invention;
FIG. 5 is a schematic view of a tightening mechanism in a robotic welding device of the grass cutting hob of the present invention;
FIG. 6 is a schematic view of the edge grinding mechanism of the grass cutting hob of the present invention;
fig. 7 is a schematic view of the grinding wheel assembly of fig. 6.
The reference numerals in the drawings are respectively:
1. a cutter shaft; 2. a cutterhead; 3. positioning holes; 4. a rolling blade; 5. a slot; 6. a bearing section;
100. a base; 110. a track; 120. a locking lever; 200. a driving mechanism; 210. a chuck; 220. a first thimble; 300. a jacking mechanism; 310. a pushing seat is tightly pressed; 320. a cylinder is tightly propped; 330. a pressing plate; 331. an adjustment tank; 340. a second thimble; 350. a positioning pin; 360. a nut; 400. a material supporting mechanism; 410. a material supporting seat; 420. a material supporting cylinder; 430. a material supporting plate; 500. a fixed support assembly; 510. a fixed support; 520. a first support plate; 600. a movable support assembly; 610. a movable support; 620. a guide rail; 630. a second support plate; 640. a motor; 700. a grinding wheel assembly; 710. a grinding wheel seat; 720. grinding wheel; 730. a follow-up pressing plate;
Detailed Description
The invention is further described below in connection with specific embodiments and the accompanying drawings.
Example 1
As shown in fig. 1 and 2, the structure of the grass cutting hob mainly comprises a hob shaft 1, a cutterhead 2 and hob pieces 4; the cutter head 2 is provided with a plurality of slots 5 which are welded at equal intervals along the axial direction of the cutter shaft 1, the cutter head 2 is provided with a plurality of positioning holes 3 which are uniformly distributed along the circumferential direction and are used for adjusting the dynamic balance of the rotation of the cutter after the cutter is processed, the spiral cutter blades 4 are sequentially inserted into the slots 5 for positioning and then welded and fixed, and the number of the slots 5 is corresponding to that of the cutter head 2. In addition, the cutter shaft 1 has a bearing section 6 at each end for mounting a bearing for mounting the hob to the lawn mower in use. The outer surface of the hob plate 4 has two inclined surfaces, namely a cutting edge and a cutting edge, wherein the cutting edge has a tip angle β and a cutting edge angle α, and the cutting edge angle α is generally 15 ° to 20 °, and the cutting edge angle β is 50 ° to 55 °, so that cutting is mainly performed by the cutting edge during mowing. The robot welding device for the grass cutting hob of the present embodiment is a special device for welding the hob blade 4 to the cutterhead 2 by using a welding robot, and the structure thereof will be described in detail below.
As shown in fig. 3 and 4, the robot welding device for a grass cutting hob of the present embodiment includes a stand 100, and a driving mechanism 200 and a tightening mechanism 300 disposed on the stand 100 in a left-right opposite manner. The driving mechanism 200 comprises a motor case, a chuck 210 and a first ejector pin 220, wherein the chuck 210 is driven by a first motor in the motor case, and the first ejector pin 220 is arranged on the chuck 210; the propping mechanism 300 comprises a propping seat 310, a propping cylinder 320 and a propping plate 330, wherein the propping seat 310 is slidably arranged on a track 110 fixed on the machine base 100, the propping cylinder 320 is fixed on the propping seat 310, the propping seat 310 is connected with the propping plate 330, and a second thimble 340 coaxial with the first thimble 220 is arranged on the propping plate 330.
The material supporting mechanism 400 is disposed between the driving mechanism 200 and the tightening mechanism 300, and the material supporting mechanism 400 includes a material supporting seat 410, a material supporting cylinder 420 and a material supporting plate 430 disposed on the machine base 100. Wherein, the material supporting cylinder 420 is installed on the material supporting seat 410, and is connected with the material supporting plate 430 to drive the material supporting plate 430 to move up and down. The material supporting mechanism 400 is adopted for feeding, the hob shaft 1 of the hob is adjusted to be equal to the axis of the thimble, the thimble can conveniently prop the hob shaft 1 from the two ends of the hob shaft 1, thus the manual feeding is not needed, the time and the labor are saved, and the operation safety is also improved.
Because the hob has different models and different sizes, the corresponding positioning holes 3 are different in position, so that the welding robot cannot accurately find the welding initial point, as shown in fig. 5, the tightening plate 330 is provided with the adjusting groove 331, one end of the positioning pin 350 is fixed in the adjusting groove 331 through the nut 360, the other end of the positioning pin 350 is a positioning end, the positioning end is matched with the positioning hole 3 on the cutterhead 2, and the positioning end can be inserted into the positioning hole 3 and locked and positioned through the nut 360, so that the adaptability of the hob is enhanced.
It should be noted that, in order to install the hob on the device, the propping mechanism 300 adopts a movable structure, so that after the hob is propped up, the hob may be loosened and even fall down due to rotation of the hob in the welding process, and therefore, in this embodiment, the locking lever 120 is provided on the stand 100, and the locking lever 120 is provided with a plurality of locking holes along the length direction; the ear plate is arranged on the jacking seat 310, the jacking seat 310 and the locking rod 120 are fixedly connected through the locking pin inserted into the locking hole, the hob shaking and even falling caused by the fact that the jacking mechanism 300 is retreated loose in the hob rotating process can be prevented, and the welding stability and safety are improved.
The robot welding device of the grass cutting hob of the embodiment is special matched equipment for welding hob pieces 4 of the grass cutting hob by a robot, can clamp and position at one time, can control the hob to rotate by corresponding angles according to welding steps according to different welding points, and meets the point-to-point welding requirement of a welding robot; the welding robot replaces manual welding, the problems that the welding space between adjacent rolling blades is narrow and the welding field of view is limited are completely avoided, the welding efficiency is improved by tens of times compared with manual welding, the welding seam is even and full, the quality is good, and the connection strength of the hob 4 and the cutterhead 2 is enhanced.
Example 2
The embodiment provides a method for welding a grass cutting hob, which adopts the robot welding device of the grass cutting hob in the embodiment 1 to be matched with a welding robot to weld hob pieces 4 on a cutter head 2. In this embodiment, the cutter head 2 has 5, the hob plate 4 has 10, the general blade back angle alpha=16°, the blade tip angle beta=53°, the specific operation steps of welding are as follows:
(1) the rolling blades 4 are sequentially arranged in slots 5 on the cutter head 2, and are fixed from the two ends and/or the middle part of the hob 4 by packing steel belts or hoops, wherein the hoops are selected to be fixed from the two ends of the hob 4;
(2) placing a hob on a material supporting plate 430 of the material supporting mechanism 400, and operating a material supporting cylinder 420 to adjust the height of the material supporting plate 430, so that a hob shaft 1 of the hob is coaxial with the first thimble 220, and the first thimble 220 is jacked into a thimble hole at one end of the hob shaft 1;
(3) the jacking mechanism 300 approaches the driving mechanism 200 along the track 110, the jacking cylinder 320 pushes the second thimble 340 to jack into a thimble hole at the other end of the hob shaft 1, the hob is jacked, and the positioning pin 350 is ensured to be inserted into the positioning hole 3 of the cutterhead 2; meanwhile, the material supporting cylinder 420 drives the material supporting plate 430 to descend, and the material supporting plate 430 is retracted;
(4) inserting a locking pin into a locking hole on the locking lever 120 to lock the position of the pressing seat 310;
(5) the welding robot is adopted to fillet weld the juncture of the hob pieces 4 on the hob and the cutterhead 2, and the cutterheads 2 from one end of the hob shaft 1 to the other end are welded one by one; after each two adjacent hob 4 mounting positions on one cutterhead 2 are welded, the driving mechanism 200 acts to drive rolling to rotate for 72 degrees until all the hob 4 mounting positions on the same cutterhead 2 are welded, the welding robot moves to the next cutterhead 2 for welding, and so on until the welding is completed.
According to the welding method of the grass cutting hob, the robot welding device of the grass cutting hob is matched with the welding robot to weld the hob pieces 4, the operation is simple, the automation degree is high, the welding operation can be completed rapidly and efficiently, and the welding quality is high. And the welding positions of two adjacent hob pieces 4 on the same cutterhead 2 are selected to be welded each time, which is the best welding mode limited by welding space, so that the welding efficiency can be improved, and the welding process of a welding robot is simplified conveniently.
Example 3
The present embodiment provides a method for grinding a hob cutter, in which the hob cutter welded in the embodiment 1 is ground to grind the cutting edge of the hob cutter piece 4. The hob blade 4 is spiral, and the cutting edge of the hob blade is also spiral, so that the grinding along the spiral line cannot be finished by the conventional common grinding machine, and the difficulty of hob grinding is also overcome.
As shown in fig. 6 and 7, the grass cutting hob blade grinding device of the present embodiment includes a grinding wheel mechanism including a fixed support assembly 500, a movable support assembly 600, and a grinding wheel assembly 700. Wherein the fixed support assembly 500 includes a fixed support 510 and a first support plate 520 mounted on the fixed support 510, the first support plate 520 having a first bearing hole; the movable support assembly 600 includes a movable support 610 slidably disposed on the guide rail 620, a second support plate 630, and a motor 640, the second support plate 630 being installed on the movable support 610 and having a second bearing hole, the motor 640 being connected to the movable support 610 through a screw-nut pair; the grinding wheel assembly 700 includes a grinding wheel seat 710, a grinding wheel 720 and a follow-up pressing plate 730, the grinding wheel 720 and the follow-up pressing plate 730 are mounted on the grinding wheel seat 710, and the follow-up pressing plate 730 is located below the grinding wheel 720, and the grinding wheel 720 is driven by a grinding wheel motor; the front end of the follow-up pressing plate 730 is provided with the ball, so that friction between the follow-up pressing plate 730 and the hob plate 4 can be reduced, abrasion of the follow-up pressing plate 730 is reduced, and long-term machining edge accuracy is guaranteed.
The grinding process of the grinding wheel mechanism for grinding the cutting edge of the hob 4 comprises the following steps: firstly, bearings are sleeved on the bearing sections 6 at the two ends of the hob shaft 1, and the movable support 610 is driven to move by the motor 640, so that the bearings at the two ends of the hob shaft 1 are respectively installed into the first bearing hole of the first supporting plate 520 and the second bearing hole of the second supporting plate 630; then, the grinding wheel seat 710 is moved to one end of the hob 4, the grinding wheel seat 710 is made to approach the hob 4, the hob 4 is inserted between the grinding wheel 720 and the follow-up pressing plate 730, the grinding wheel 720 is contacted with the upper side surface of the hob 4, and the balls at the front end of the follow-up pressing plate 730 are contacted with the lower side surface of the hob 4; then, the grinding wheel motor is started, the grinding wheel 720 grinds the hob 4, the hob shaft 1 rotates under the limitation of the grinding wheel 720 and the follow-up pressing plate 730 along the axial movement of the grinding wheel seat 710 along the hob shaft 1, and the grinding wheel 720 grinds the cutting edge along the hob 4.
To improve the accuracy of the edge grinding surface, after the grinding wheel seat 710 is moved from one end to the other end of the arbor 1 to finish the grinding once, the grinding is reversely performed again, and after the grinding is performed twice, the corresponding edge face is machined. Wherein, the angle α of the blade back is firstly ground, after grinding, the position of the follower pressing plate 730 is adjusted, and then the angle β=53° of the blade back is ground.
According to the grinding method of the grass cutting hob, the grinding wheel mechanism is adopted to grind the cutting edge of the hob 4, the hob 4 is limited between the grinding wheel 720 and the follow-up pressing plate 730 through ingenious matching of the grinding wheel 720 and the follow-up pressing plate 730, and the hob 4 can be driven to rotate along with axial movement of the grinding wheel 720 along the hob shaft 1, so that the grinding wheel 720 grinds the cutting edge along the edge of the hob 4, the structure is very simple, but also very ingenious, and the grinding difficulty of the cutting edge of the hob 4 is greatly simplified.
Example 4
The present embodiment provides a grinding method of a grass cutting hob, which is basically the same as embodiment 3 except that: the grinding wheel assembly 700 in the grass cutting hob blade grinding device is mounted on a translation mechanism, and the translation mechanism can drive the grinding wheel assembly 700 to move along an X axis (parallel to the axial direction of the hob shaft 1) and a Y axis (perpendicular to the axial direction of the hob shaft 1), so that the feeding and the trend of the grinding wheel 720 are realized. The translation mechanism comprises a Y-axis guide rail and a Y-axis sliding seat arranged on the Y-axis guide rail, and the Y-axis sliding seat is connected with a Y-axis motor through a screw nut pair, so that the Y-axis motor can drive the Y-axis sliding seat to move along the Y axis; the grinding wheel seat 710 is arranged on the Y-axis sliding seat through a linear guide rail pair, the grinding wheel seat 710 is also connected with the Y-axis sliding seat through a screw nut pair, and the grinding wheel seat 710 can be driven to move along the X-axis through a handle to feed.
Example 5
The embodiment provides a processing method of a grass cutting hob, which carries out further deep processing on the basis of the hob welded in the embodiment 2, and comprises the following specific operation steps:
1. hob blade welding
The hob plate 4 was welded by the welding method of example 2.
2. Roller blade heat treatment
1) Heating in a furnace
The hob after the welding in the embodiment 2 is vertically lifted and is put into a heat treatment furnace for heat treatment, the temperature in the furnace is 890 ℃ to 890 ℃, and the heat preservation is carried out for 1 to 1.5 hours;
2) Oil quenching treatment
Taking out the hob from the heat treatment furnace, putting the hob into oil for oil quenching for 2-3 minutes, taking out the hob and cooling the hob to room temperature in an air way;
3) Tempering treatment
Tempering temperature is 340-355 ℃, heat preservation is carried out for 2-3 hours, and natural cooling is carried out to room temperature; the hardness of the hob 4 after tempering treatment is 48-52 HRC, and the deformation and internal stress of the hob 4 are relatively small, so that the hob 4 is convenient for subsequent grinding treatment.
3. Vehicle end face
And (3) machining the end faces of the hob by using a lathe to enable the end faces of hob pieces 4 at two ends of the hob to be flush.
4. Outer circle mill
Grinding the excircle of the hob on a grinding machine so that the outer edges of hob pieces 4 are positioned on the same cylindrical surface; meanwhile, the bearing section 6 of the hob shaft 1 is ground, so that the bearing section 6 coincides with the rotation axis of the hob plate 4, and vibration and noise generated when the hob is mounted on the lawn mower are effectively reduced.
5. One-time grinding blade
Grinding the back angle alpha of the hob 4 by adopting the grinding method of the embodiment 3;
6. baking finish treatment
The hob after the fifth step is firstly subjected to sand blasting treatment to remove surface rust, oxide layers, greasy dirt and the like, and then other parts except mounting positions such as bearings, key connection and the like at the two ends of the hob shaft 1 are subjected to paint spraying; and finally, baking varnish.
7. Secondary grinding blade
The grinding method of example 3 was again used to grind the cutting edge angle β of the hob blade 4, thereby completing the entire machining of the hob.
The grass cutting hob processed by the grass cutting hob processing method of the embodiment has strong wear resistance and corrosion resistance and attractive appearance.
The examples of the present invention are merely for describing the preferred embodiments of the present invention, and are not intended to limit the spirit and scope of the present invention, and those skilled in the art should make various changes and modifications to the technical solution of the present invention without departing from the spirit of the present invention.
Claims (3)
1. A grinding method of a grass cutting hob blade adopts a grass cutting hob blade grinding device to grind; the grass cutting hob edge grinding device comprises a grinding wheel mechanism; the grinding wheel mechanism comprises a fixed supporting component (500), a movable supporting component (600) and a grinding wheel component (700); the fixed support assembly (500) comprises a fixed support (510) and a first support plate (520) mounted on the fixed support (510), the first support plate (520) having a first bearing hole; the movable support assembly (600) comprises a movable support (610) arranged on the guide rail (620) in a sliding manner, a second support plate (630) and a motor (640), wherein the second support plate (630) is arranged on the movable support (610) and is provided with a second bearing hole, and the motor (640) is connected with the movable support (610) through a screw nut pair; the grinding wheel assembly (700) comprises a grinding wheel seat (710), a grinding wheel (720) and a follow-up pressing plate (730), wherein the grinding wheel (720) and the follow-up pressing plate (730) are arranged on the grinding wheel seat (710), the follow-up pressing plate (730) is positioned below the grinding wheel (720), and the grinding wheel (720) is driven by a grinding wheel motor;
the grinding operation steps are as follows: firstly, sleeving bearings on bearing sections (6) at two ends of a hob shaft (1), and driving a movable support (610) to move through a motor (640), so that the bearings at two ends of the hob shaft (1) are respectively installed into a first bearing hole of a first supporting plate (520) and a second bearing hole of a second supporting plate (630); then, the grinding wheel seat (710) moves to one end of the hob blade (4), the grinding wheel seat (710) is close to the hob blade (4), the hob blade (4) is inserted between the grinding wheel (720) and the follow-up pressing plate (730), the grinding wheel (720) is contacted with the upper side surface of the hob blade (4), and the balls at the front end of the follow-up pressing plate (730) are contacted with the lower side surface of the hob blade (4); then, a grinding wheel motor is started, a grinding wheel (720) grinds the hob (4), the hob (1) rotates under the limitation of the grinding wheel (720) and a follow-up pressing plate (730) along the axial movement of the grinding wheel seat (710) along the hob shaft (1), and the grinding wheel (720) grinds a cutting edge along the hob (4);
a welding robot is adopted to weld the rolling blade (4) on the cutter head (2), and then the grinding processing of the cutting edge of the rolling blade (4) is carried out; when the hob pieces (4) are welded, the hob is fixed by a robot welding device for cutting the hob, and then a welding robot is used for welding;
the robot welding device of the grass cutting hob comprises a base (100), and a driving mechanism (200) and a jacking mechanism (300) which are oppositely arranged left and right on the base (100); the driving mechanism (200) comprises a motor box, a chuck (210) and a first thimble (220), the chuck (210) is driven by a first motor in the motor box, and the first thimble (220) is arranged on the chuck (210); the jacking mechanism (300) comprises a jacking seat (310), a jacking cylinder (320) and a jacking plate (330), wherein the jacking seat (310) is arranged on a track (110) fixed on the machine base (100) in a sliding mode, the jacking cylinder (320) is fixed on the jacking seat (310), the jacking seat (310) is connected with the jacking plate (330), and a second thimble (340) coaxial with the first thimble (220) is arranged on the jacking plate (330); the robot welding device of the grass cutting hob further comprises a material supporting mechanism (400) positioned between the driving mechanism (200) and the jacking mechanism (300); the material supporting mechanism (400) comprises a material supporting seat (410), a material supporting cylinder (420) and a material supporting plate (430) which are arranged on the machine base (100); the material supporting cylinder (420) is arranged on the material supporting seat (410) and is connected with the material supporting plate (430) to drive the material supporting plate (430) to move up and down; the machine seat (100) is provided with a locking rod (120), and the locking rod (120) is provided with a plurality of locking holes along the length direction; the propping base (310) is provided with an ear plate which can be inserted into the locking hole through the locking pin to fixedly connect with the locking rod (120);
the rolling blade (4) is welded on the cutter head (2), and the operation steps are as follows:
(1) sequentially installing the rolling blades (4) into slots (5) on the cutter head (2), and fixing the rolling blades (4);
(2) placing a hob on a material supporting plate (430) of a material supporting mechanism (400), and adjusting the height of the material supporting plate (430) by a material supporting cylinder (420) to enable a hob shaft (1) of the hob to be coaxial with a first thimble (220) and enable the first thimble (220) to be jacked into a thimble hole at one end of the hob shaft (1);
(3) the jacking mechanism (300) approaches the driving mechanism (200) along the track (110), the jacking cylinder (320) pushes the second thimble (340) to jack into a thimble hole at the other end of the hob shaft (1), the hob is jacked, and the positioning pin (350) is ensured to be inserted into the positioning hole (3) of the cutterhead (2); simultaneously, the material supporting cylinder (420) drives the material supporting plate (430) to descend, and the material supporting plate (430) is retracted;
(4) inserting a locking pin into a locking hole on the locking rod (120) to lock the position of the jacking seat (310);
(5) the welding robot is adopted to fillet weld the juncture of the hob blade (4) and the cutterhead (2) on the hob, and the cutterheads (2) from one end of the hob shaft (1) to the other end are welded one by one; after each welding position of two adjacent hob pieces (4) on one cutterhead (2), the driving mechanism (200) acts to drive rolling rotation 720/n degrees, n is the number of the hob pieces (4) until the welding positions of all the hob pieces (4) on the same cutterhead (2) are welded, the welding robot moves to the next cutterhead (2) to weld, and so on until the welding is completed.
2. The method for grinding the edge of a grass cutting hob according to claim 1, wherein: after the grinding wheel seat (710) moves from one end of the cutter shaft (1) to the other end to finish grinding once, grinding is reversely performed again, and after grinding twice, the corresponding cutter edge surface is processed.
3. The method for grinding the edge of a grass cutting hob according to claim 1, wherein: in the step (1), the two ends and/or the middle part of the hob plate (4) are/is fixed by packing steel belts or hoops.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711373874.1A CN107877024B (en) | 2017-12-19 | 2017-12-19 | Cutting edge grinding device for grass cutting hob and grinding method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711373874.1A CN107877024B (en) | 2017-12-19 | 2017-12-19 | Cutting edge grinding device for grass cutting hob and grinding method thereof |
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| CN107877024A CN107877024A (en) | 2018-04-06 |
| CN107877024B true CN107877024B (en) | 2023-07-14 |
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| US11819974B2 (en) * | 2019-02-01 | 2023-11-21 | Foley United Llc | Grinding positioning plate for reel-type mower unit |
| CN110116342B (en) * | 2019-04-02 | 2021-06-04 | 应辉辉 | Gear hob cutting edge grinding machine |
| CN110936236B (en) * | 2019-06-10 | 2022-05-13 | 青州市泰丰齿轮有限公司 | Dust-proof gear hob grinding device |
| CN112757060A (en) * | 2020-12-24 | 2021-05-07 | 莱芜泰山煤矿机械有限公司 | Hobbing cutter sharpening tool |
| CN115302324B (en) * | 2022-07-21 | 2024-01-26 | 万华禾香板业(荆门)有限责任公司 | Quick loading and unloading repair system for ring type flaker |
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| US8512098B1 (en) * | 2010-09-28 | 2013-08-20 | Jeffrey Bonner | Machining technique using a plated superabrasive grinding wheel on a swiss style screw machine |
| CN105690250A (en) * | 2014-11-28 | 2016-06-22 | 湖北铭久汽车零部件有限公司 | Grinding fixture for gear hob edge |
| CN105033781B (en) * | 2015-09-09 | 2017-03-29 | 兴化市台林机械有限公司 | A kind of multifunctional grinder and its method of work |
| CN106078510B (en) * | 2016-07-26 | 2019-01-18 | 佛山职业技术学院 | A kind of grinding machine with on-line measurement function |
| CN206105524U (en) * | 2016-08-31 | 2017-04-19 | 浙江赛格园林机械有限公司 | Hobbing cutter piece sharpening device of lawn mower hobbing cutter |
| CN206484209U (en) * | 2017-01-24 | 2017-09-12 | 常州天聚星工具有限公司 | Lawn-mower hobbing cutter blade welding tooling |
| CN206763997U (en) * | 2017-03-31 | 2017-12-19 | 东莞市长沃精密机械有限公司 | Full-automatic bar cutting machine |
| CN207723718U (en) * | 2017-12-19 | 2018-08-14 | 马鞍山市绿之友机械制造有限公司 | One kind cutting careless hobboing cutter blade grinding attachment |
| CN108115302A (en) * | 2017-12-19 | 2018-06-05 | 马鞍山市绿之友机械制造有限公司 | A kind of processing method for cutting careless hobboing cutter |
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