CN201872006U - Precise grinding tool fixture of ceramic coating of coating scraper - Google Patents

Abstract

The utility model discloses a precise grinding tool fixture of a ceramic coating of a coating scraper. The tool fixture consists of a seat frame, a rubber-covered roller fixture arranged on the seat frame and a driving device for driving the rubber-covered roller fixture to run. The top face, the front end face, the front inclined face and the rear inclined face of the ceramic coating of the coating scraper are sequentially grinded by the tool fixture, so that the linear deviation of the grinded ceramic cutting edge of the coating scraper is not more than 0.015mm/m and the parallelism deviation of the cutting edge is not more than 0.01mm/mm, and the surface roughness Ra is equal to 0.246, so as to meet the requirement of the using precision. With the adoption of the grinding tool fixture, the ceramic coating of the coating scraper is grinded on a small surface grinder, so as to avoid grinding the ceramic coating through the large-scale precision grinder. Therefore, the investment is small and the production cost is low.

Description

Precision Grinding Fixture for Coating Scraper Ceramic Coating

technical field

The utility model relates to a coating scraper, in particular to a grinding process for a ceramic coating of a coating scraper.

Background technique

With the advancement of my country's papermaking industry technology, the application of spraying ceramic coatings (ceramic scrapers for short) on the blades of coating scrapers is becoming more and more widespread. The preparation process of the ceramic scraper is to spray a layer of wear-resistant coating on the edge of the steel scraper, with a thickness of about 0.3mm, and then precision grind to obtain the required geometric edge performance. The wear-resistant coating can be prepared by plasma or HVOF spraying process, and the specific preparation method can refer to document CN200610043656.7. After the scraper is sprayed, the geometry of the blade needs to be obtained by precision grinding. The specific grinding surface is shown in Figure 4. Due to the long scraper, the length of the scraper used by large domestic paper companies generally ranges from 2.6 to 11 meters. It belongs to long strip-shaped large-size parts, and the geometric shape, dimension accuracy, surface finish, straightness and parallelism of the scraper blade have high precision requirements. For detailed accuracy, please refer to the document QB-T2574-2002. After spraying ceramic coating on the scraper blade, after It can be used after precision grinding. The precision grinding process of the wear-resistant coating is a key factor in determining the performance of the scraper. The precise grinding of the geometric shape of the scraper blade can be realized by using a large-scale precision grinding machine, but the investment is large and the production cost is high. The utility model designs a special tooling and grinding process for scraper coating grinding, which can use a small precision grinder to grind a ceramic coating scraper that meets precision requirements.

Utility model content

The purpose of this utility model is to design a special tooling fixture based on the precision grinding of such elongated parts, and realize the precision grinding of the blade of such elongated parts by using a small precision grinder.

The technical scheme is as follows:

A precision grinding jig for coating a ceramic coating on a doctor blade, which consists of a base frame, a rubber roller clamp mounted on the base frame, and a transmission device for driving the rubber roller clamp to run; wherein:

The seat frame is connected to two upward columns at the left and right ends of a base, and a pressure frame is respectively provided on the top of each column; the base is provided with a magnetic suction cup, which is fixed and installed on the Small precision surface grinder;

The above-mentioned rubber roller clamp is two upper and lower rubber rollers arranged in pairs. There are two pairs in total. Each pair of rubber rollers is installed on the columns at both ends of the seat frame respectively, and the two shaft ends of the lower rubber roller are installed at both ends through rolling bearings. On the column, the two shaft ends of the upper rubber roller are installed on the sliders of the columns at both ends through bearings, and the slider can move up and down on the column; there are pressing devices at both ends of the press frame, and the pressing devices are connected On the slide block, the gap and pressure adjustment of the upper and lower rubber rollers are realized through the pressing device; the pressing device is a screw pair structure, the nut of the screw pair is arranged on the press frame, and the screw rod is provided with a hand wheel, which rotates The handwheel moves the slider up and down to adjust the gap and pressure of the upper and lower rubber rollers;

The transmission device is that drive wheels are respectively installed on the shaft ends of the two lower rubber rollers, and the two lower rubber rollers run synchronously through belt transmission. The transmission device also includes a stepless speed regulation motor, stepless The speed regulating motor can rotate forward and reverse by switching the control switch, and the stepless speed regulating motor is connected with the shaft of one of the lower rubber rollers through a coupling; horizontally rotating positioning rollers are also arranged on the front and rear sides of the seat frame, The working height of the positioning roller is positioned on the contact plane of the upper and lower rubber rollers.

When the tooling fixture is actually used, it is installed and positioned on a small precision surface grinder, and the coating scraper is passed through the upper and lower rubber rollers, pressed by the pressing device, and then the position of the tooling fixture is adjusted so that the grinding wheel of the grinding machine is just in the position of the scraper coating The position of the layer, start the grinding machine to work and start the tooling fixture to run at the same time, the coating scraper is clamped by the upper and lower rubber rollers and blocked by the positioning roller, running in a straight line, and the coating scraper moves back and forth through the automatic positive and negative rotation of the stepless speed regulating motor , so as to achieve precision grinding and achieve the required accuracy.

A method for precision grinding of a ceramic coating on a coating scraper on a small precision grinding machine by utilizing the above-mentioned fixture, the process steps are as follows:

The first step: According to the requirements of the ceramic coating grinding surface of the coating scraper, select the grinding wheel of the small precision grinding machine, among which:

(1) Selection of the shape of the grinding wheel: the coating grinding surface has four surfaces, which are divided into the front surface, the front slope, the top surface, and the rear slope.

(2) Selection of grinding wheel size: use 200# diamond grinding wheel for rough grinding, with a grain size of 76 μm; use 400 # diamond grinding wheel for fine grinding, with a grain size of 46 μm;

The type of bond used for the above grinding wheels is a vitrified bond.

(3) Dressing of the grinding wheel: Install each grinding wheel on the grinding wheel chuck, and use the grinding method to trim the geometric shape and coaxiality of the grinding wheel. When dressing, the linear speed of the grinding wheel is 600m/min, and the feed rate is 5μm , 2μm, 1μm;

Step 2: Install the trimmed grinding wheel on the main shaft of the small precision grinding machine, install the fixture with the coated scraper on the workpiece position of the grinder, adjust the relative position of the grinding wheel and the coated grinding surface, and start the fixture , so that the coating scraper runs in a straight line, start the grinding machine when it is used, and make the grinding wheel and the coating scraper run in the opposite direction, and grind the four surfaces of the ceramic coating in turn. The grinding sequence is as follows:

(1) Roughly grind the top surface of the coating with a 200# disc-shaped grinding wheel, and grind it once with a feed rate of 50 μm, 20 μm, and 10 μm in turn; The 2μm and 1μm feeds are ground each time, and the top surface grinding is completed;

(2) Use a 400# bowl-shaped grinding wheel to directly grind the front end of the coating, and grind it once with a feed rate of 2 μm and 1 μm in turn, and visually observe that all the front ends to be ground have been ground until the grinding is completed;

(3) Use a 200# disc grinding wheel to roughly grind the front bevel of the coating, and then use 20 μm and 10 μm feed rate to grind it once; then use a 400 # disc grinding wheel to finely grind the front bevel of the coating; use 5 μm and 2 μm feed in turn Grinding each knife amount once; the front bevel grinding is completed;

(4) 200# disc-shaped grinding wheel roughly grinds the rear slope of the coating, and grinds it once with a feed rate of 10 μm, and the grinding of the rear slope is completed. Because the back bevel is a non-contact surface, rough grinding is enough;

So far, the linear deviation of the ceramic cutting edge of the coating scraper is not more than 0.015mm/m, the parallelism deviation of the cutting edge is not more than 0.01mm/mm, and the surface roughness is Ra0.246, which meets the requirements for use accuracy.

The positive effect of the tooling fixture of the utility model is: although the coating scraper is a strip-shaped large-sized part, it can realize the grinding of the coating on a small surface grinder through the tooling fixture, avoiding the use of large precision The grinding machine is used for grinding, so the investment is small and the production cost is low. Moreover, due to the use of this tooling fixture, the amount of elastic deformation and movement of the coating blade is overcome during grinding, ensuring the grinding accuracy; and the relative position and angle of the coating blade and the grinding wheel can be adjusted arbitrarily through the magnetic chuck, making it easier to adjust as required Mashed geometric shapes. Furthermore, during the grinding process, the grinding wheel only rotates but does not move, and there is no feeding action, so the accuracy error of the machine tool guide rail will not affect the dimensional accuracy of the workpiece. Especially after using the grinding method of the utility model, the coating scraper can fully reach the grinding precision of a large machine tool, so the investment is small and the cost is saved.

Description of drawings

Fig. 1 is a schematic front view of the fixture;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a sectional view of the grinding surface of the coating scraper;

Fig. 4 is a front view of a bowl-shaped emery wheel;

Fig. 5 is a front view of a disc-shaped diamond grinding wheel.

In the figure: 1-surface grinding wheel, 2-hand wheel, 3-top rubber roller, 4-coating scraper, 5-belt, 6-base, 7-coating, 8-stepless speed regulation motor, 9-positioning Roller, 10-coupling, 11-column, 12-slider, 13-lower rubber roller, 14-screw pair, 15-press frame; 16-front end face; 17-front bevel; 18-top face; 19- Rear bevel.

Detailed ways

As shown in Figure 1-2, the precision grinding jig of the utility model coating scraper ceramic coating consists of a seat frame, a rubber roller clamp installed on the seat frame and a transmission device for driving the rubber roller clamp to run;

Described seat frame is to connect two upward upright columns 11 respectively at the left and right ends of a base 6, and is respectively provided with press frame 15 at the two ends of each upright column 11; Fixed installation on a small precision surface grinder;

The rubber roller clamps are two upper and lower rubber rollers 3 and 13 arranged in pairs, two pairs are arranged in total, and each pair of rubber rollers is respectively installed on the columns 11 at both ends of the seat frame, wherein the two shaft ends of the lower rubber roller 13 pass through Rolling bearings are installed on the columns 11 at both ends, and the two shaft ends of the upper rubber roller 3 are installed on the sliders 12 of the columns 11 at both ends through bearings, and the sliders 12 can move up and down on the columns 11; Both ends are provided with a pressing device, and the pressing device is connected on the slider 12, and the gap and pressure adjustment of the upper and lower rubber rollers 3 and 13 are realized through the pressing device; the pressing device is a screw pair 14 structure, and the screw The nut of the pair 14 is set on the press frame 15, and the screw rod is provided with a hand wheel 2, turning the hand wheel 2 makes the slider 12 move up and down, thereby adjusting the gap and pressure between the upper and lower rubber rollers 3 and 13;

The transmission device is that transmission wheels are respectively installed on the shaft ends of the two lower rubber rollers 13, and the two lower rubber rollers 13 are driven synchronously by the belt 5, and the transmission device also includes a stepless speed regulation motor 8. The stepless speed regulation motor 8 can rotate forward and reverse by switching the control switch, and the stepless speed regulation motor 8 is connected to the shaft of one of the lower rubber rollers 13 through a coupling 10; A positioning roller 9 rotating horizontally is provided, and the working height of the positioning roller 9 is positioned on the contact plane between the upper and lower rubber rollers 3 and 13.

When in use, the fixture is specifically installed and positioned on a small precision surface grinder, the coating scraper 4 is passed through the upper and lower rubber rollers 3 and 13, pressed by the pressing device, and then the position of the fixture is adjusted so that The grinding wheel 1 of the surface grinder is just at the position of the scraper coating 7. When the grinder is started to work, the tooling fixture is started to run at the same time. The coating scraper 4 is clamped by the upper and lower rubber rollers 3 and 13 and blocked by the positioning roller 9. The automatic positive and negative rotation of the speed motor 8 makes the coating scraper 4 move back and forth, thereby realizing precision grinding and reaching the required precision.

Utilize above-mentioned frock fixture to fine-grind the coating blade ceramic coating method on the small precision grinding machine, process steps are as follows:

The first step: According to the requirements of the ceramic coating grinding surface of the coating scraper, select the grinding wheel of the small precision grinding machine

(1) Selection of the shape of the grinding wheel: the coating grinding surface has four surfaces in total (see Figure 3), which are divided into 16 front faces, 17 front bevels, 18 top faces, and 19 rear bevels. The front end face 16 adopts a bowl-shaped diamond grinding wheel (see Fig. 4), front bevel 17, top surface 18 and rear bevel 19 select disc type diamond emery wheel (seeing figure 5) for use.

(2) Selection of grinding wheel size: use 200# diamond grinding wheel for rough grinding, with a grain size of 76 μm; use 400 # diamond grinding wheel for fine grinding, with a grain size of 46 μm;

The bond type of the above grinding wheel is vitrified bond;

(3) Dressing of the grinding wheel: install each grinding wheel 1 on the grinding wheel chuck, and use the grinding method to trim the geometric shape and coaxiality of the grinding wheel. 5μm, 2μm, 1μm;

Step 2: Install the trimmed grinding wheel 1 on the main shaft of the small precision grinding machine, install the fixture with the coated scraper 4 on the workpiece position of the grinding machine, and adjust the relative position of the grinding surface of the grinding wheel 1 and the coating 7 , start the tooling fixture, make the coating scraper 4 run in a straight line, start the grinder in time, make the grinding wheel 1 and the coating scraper 4 run in the opposite direction, and grind the four faces of the ceramic coating 7 in turn. The grinding sequence is as follows:

(1) Use a 200# disc-type grinding wheel to roughly grind the top surface 18 of the coating, and then use 50 μm, 20 μm, and 10 μm in turn to grind the top surface 18 of the coating; 5μm, 2μm, and 1μm feed amount are ground once respectively, and the top surface grinding is completed;

(2) Directly finely grind the front end face 16 of the coating with a 400# bowl-shaped emery wheel, and grind it once with a feed rate of 2 μm and 1 μm in turn, and visually observe that all the front end faces to be ground are ground until the grinding is completed;

(3) Use a 200# disc-type grinding wheel to roughly grind the front bevel 17 of the coating, and then grind it once with a feed rate of 20 μm and 10 μm; then use a 400# disc-type grinding wheel to finely grind the front bevel 17 of the coating; use 5 μm and 2 μm in sequence The amount of feed is ground once; the grinding of the front bevel 17 is completed;

(4) Roughly grind the rear bevel 19 of the coating with a 200# disc-shaped grinding wheel, and grind it once with a feed rate of 10 μm, and the grinding of the rear bevel 19 is completed. Because the rear bevel 19 is a non-contact surface, it can be roughly ground once;

So far, the linear deviation of the ceramic cutting edge of the coating scraper 4 is not greater than 0.015mm/m, the deviation of the parallelism of the cutting edge is not greater than 0.01mm/mm, and the surface roughness Ra0.246 meets the requirements for use accuracy.

Claims (1)

1. the accurate grinding frock clamp of a coating blade ceramic coating is characterized in that, it is made up of a mounting, the transmission device that is installed in the rubber roll anchor clamps on the mounting and drives the running of rubber roll anchor clamps; Wherein:

Described mounting is to connect two columns that make progress respectively at the two ends, the left and right sides of a base, and is respectively equipped with the pressure frame on the top of each column; Described base is provided with magnetic suction disc, is fixedly mounted on the miniature precision surface grinding machine by magnetic suction disc;

Described rubber roll anchor clamps are two rubber rolls up and down arranged in pairs, arrange two pairs altogether, every pair of rubber roll is installed in respectively on the column at mounting two ends, wherein two of lower rubber roller axle heads are installed on the column of two ends by rolling bearing, two axle heads of upper glue roller are installed in by bearing on the slide block of two ends column, and slide block can move up and down on column; Be provided with hold down gag at described pressure frame two ends, hold down gag is connected on the slide block, realizes the gap and the pressure adjustment of two rubber rolls up and down by hold down gag; Described hold down gag is the screw pair structure, and the nut of screw pair is located at presses on the frame, and screw rod is provided with handwheel, rotates handwheel slide block is moved up and down, thereby adjust gap and the pressure of going up lower rubber roller;

Described transmission device is that the axle head at two lower rubber rollers is separately installed with drive, make two lower rubber roller run-in synchronisms by belt transmission, described transmission device also comprises a stepless speed-regulating motor, stepless speed-regulating motor can forward and reversely rotate by the switching controls switch, and stepless speed-regulating motor is connected with the axle of one of them lower rubber roller by shaft coupling; Both sides also are provided with the positioning roller that horizontally rotates before and after described mounting, and the working depth of positioning roller is positioned on the contact plane of lower rubber roller.

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