VA38 Adjustable Small Gap Centrifugal Disc Finishing (Wet/Dry)

The VA series machines from Inovatec work on the centrifugal disc finishing concept. They function with a highly effective and efficient mass finishing system.

Introduction

The patented adjustable gap system of the VA series enables a precision of 0.05mm. The unique setting of the gap between the disc and the ring of the barrel makes super fine polishing granules to be possibly used as tumbling media. The VA series model produces the superior polishing surface with the lowest processing cost. Besides, the customized process prevents the gap from overheating.

centrifugal disc finishing machine VA20-2

 

Working principle

The VA series machine from Inovatec works on the centrifugal disc finishing concept; it functioned with a highly effective and efficient mass finishing system. During this process, the components are processed in a barrel-shaped container where media and components make a rotational relative movement. The media inside the container is driven by the centrifugal force of the disc generated from the bottom of the container. The disc is separated from the container wall by an adjustable gap where the water is flowing through in the wet processing machine. In a dry processing machine for fine polishing, however, the gap is there for the disc’s rotation.

The centrifugal force with different media acting on the surface of the component gives different finishing results, which will offer at least 20 times high productivity compared with the vibratory finishing process. During wet surface finishing processing, constant water and compound flow takes away wear-off debris together. This leaves the components of a fresh and clean surface.

 

Application

Suitable for small to medium-sized production capacity, especially suitable for flexible production with small batches of multi-category production.

jewelry-polishing-with-porcelain-media

 

Feature

  • Lower capital investment compared with CF ZERO gap machine model
  • The system model can be customized according to customer requirement
  • Better cost-effective
  • High efficient machine design with already in-hand experience and process
  • Superior surface finishing
  • deburring machine polishing machine buffing machine
  • VA20 high precision centrifugal disc finishing machine outside view drawing

VA60 Centrifugal disc finishing machine

  1. Frame  2. Grinding Barrel  3. Electrical Control Box  4. Handle  5. Cycle Water Device (Inlet Valve)  6. Screen  7. Collector

Instruction  Of  Water  System

  1. Pump   2. Fitting   3. Quick  Fitting   4. Tube-Circular  Water   5. Bend   6. Valve-Control  Quantity  Of  Water  7. Plastic  Drainpipe   8. Water  Tank-ratio of grinding   9. Plug  into the socket under the electric box   10.Pump  Plug

separator for media and parts

 

Installation:

  • 1. Assemble 1, 2, 3, 4, 5, 6 as a set, Put the pump into the water tank;
  • 2. Assemble the support on the top of the barrel;
  • 3. If you want to use the water comes down from 7 circularly to drain water to the water tank.

centrifugal disc finishing machine VA38

 

Precaution

Please read and understand the manual before use the machine.

1. Acid or alkaline will damage the machine and dangerous. Do use the neutral compound.

2. Check whether the gap is suitable for the process. Do not put material smaller than the gap into the barrel. Do not put sharp objects into the barrel as they will damage it.

3. The wet barrel is only for the wet process and the dry barrel is only for the dry process due to the different structures of the barrels. Ensure that the recirculation water system always works properly when doing the wet grinding process.

4. The user must use the machine in a correct and normal way. The inverter and gap can only be adjusted by qualified personnel.

5. The polishing stone and the dry polishing media mixed with polishing paste have a different grade; the different grade media cannot be used together. When doing several different processes in the same barrel, make sure the barrel is clean and no media used in the last process left before putting new media. In the dry polishing process, the workpiece must be dried and cleaned with an ultrasonic machine after each process.

6. Check whether the machine works properly before doing every process. If not, stop the machine and check immediately. Check the machine during the operation regularly. If there is any fault, stop the machine and check immediately.

7. Clean the tank regularly to ensure the cleanliness of the water. Put some new polishing compound after changing the water. After use, the polishing media should be taken out, and make sure the barrel and the machine are in a clean condition.

8. If the machine is not in use for a long time, take the pump out and clean it; the tank and the polishing media should also be cleaned. Switch off and unplug the machine after every use.

Dear customers:

Thank you for choosing the newest type of Inovatec LDG series high-precision centrifugal disc finishing machine. The LDG series high-precision centrifugal disc finishing machines are made with many improvements on the basis of the old series machine in the structure, accuracy, and material of key parts. The new series machine is more durable than the old type. The LDG series gyrate polishing machines introduce gyrate theory. It is more efficient for the gyrate working theory, watches, glasses, electronic components and various small fittings.

1.Preface

1.1 The machine should be started after the service and maintenance person has read and understood the instruction manual.

1.2 The machine has been treated in the factory so there may be some remainder of the material in the barrel.

1.3 There are different specification machines: single wet grinding barrel, two barrels with one dry and one wet barrels, and three barrels with one dry and two wet barrels. Other specifications are available according to your requirement.

VA20-3 centrifugal disc finishing machine

 

1.4 Warning: We do not guarantee the damage and loss, resulting from an operation not following the instructions.

2.Safe Instruction

2.1 The machine should be placed on a stable and levelled surface and in a well-ventilated condition. Avoid placing the machine in acid or an alkaline condition.

2.2 Ensure the ground line is connected before starting the machine. Do not put heavy things on the machine. Ensure that the machine works in a well-ventilated condition.

2.3 Recommend using Inovatec series polishing media and polishing compound.

2.4 Acid or alkaline material will damage the machine badly and are dangerous.

2.5 Switch off and unplug the machine when not in use.

3.Main Parameter

4.Structure (See the Outside View Drawing)

4.1 Machine structure: The machine is made up of barrels, lock screw, pneumatic device, frame, screen device, recirculated water device (wet), and electrical control box.

4.1.1 There are two types of grinding barrel: dry grinding barrel and wet grinding barrel. The grinding barrel is made up of barrel seat, rotating disc, and adjustable helix stationary wall. Adjustable helix stationary wall is made up of polyurethane (PU) wall, aluminum adjusting ring, steel ring (dry barrel), or polyurethane (PU) ring (wet barrel). The rotating disc is made by aluminum, matched with an adjustable aluminum ring by means of spring steel balls and six lock screw holes individually on the top of the barrel. Each barrel is powered by an individual motor by means of a timing belt. Motor rotating speed is controlled by an AC inverter. The speed is adjustable. The rotating direction is controlled by a timer. It can rotate in clockwise and counterclockwise. The default value of the gap between stationary wall and rotating disc is 0.1-0.2mm. Adjust the gap by turning the stationary wall in clockwise or counterclockwise. Pull the handle behind of the barrel to overturn and discharge the workpiece and media.

4.1.2 Each grinding barrel is installed with six screws and a pneumatic device; six screws are located below the flange of the barrel seat to ensure the stability of the adjustable stationary wall. The pneumatic device is located at the bottom-left side of the grinding barrel to ensure easy discharging of the workpieces when pulling the handle behind the barrel.

4.1.3 The frame is welded of the steel plate and steel tube.

4.14 Screen device located in front of the frame is made up of the screen, collector and stainless steel plate. It discharges the workpiece and media.

4.15 The wet grinding barrel is made up of a recirculated water device and deposit tank. Recirculated water device is with the adjustable switch to control water flow (see recirculated water device instruction). When the wet grinding barrel is started, the recirculated water device is started simultaneously. The deposit water can pump and reuse and save cost. It is to facilitate the recovery of metal’s value.

Warning: When the wet grinding barrel is started, ensure that the water flows into the grinding barrel from the water nozzle of the recirculated water device!!! Otherwise, the machine will be damaged badly.

4.1.6 The electrical control box is installed on the right side of the frame; there are single barrel or double barrels (left and right), or three barrels (left, middle and right) operation systems. Each operation system functions in setting the rotating speed, normal/reversal, and timing.

5.Preparation Before Start

5.1 Please read and understand the machine and inverter instruction manual before using.

5.2 Check whether all screws have been tightened.

5.3 Check whether components in the electrical control box are properly connected.

5.4 Check whether the power voltage is three-phase of 220V/50HZ.

5.5 Adjust the timer of normal/reversal and operation.

6.Initial Start

Warning:

Ensure that there isn’t any material in the barrel before starting the machine!!!

The precision of the machine has been adjusted in the factory. If not necessary, please do not disassemble the machine!!! Do not operate the wet grinding barrel without water!! The parameter can only be adjusted by qualified personal!! After starting, the machine will reach the standard rotating speed after 15 minutes of acceleration time; the default value of turning timer (in the electrical control box) is 0 minute.

6.1 Connect the power, “0” or “50” will flicker in the screen of inverter.

6.2 Press the “RUN” key of one barrel, the time of corresponding barrel starts working. The recirculated water device starts simultaneously.

6.3 Press the “△” or “▽” button until the display changes to accelerate or decelerate the speed. Actual speed will be displayed on the screen. The attempt of operation in maximum speed for 3~5 minutes is allowed and check the machine if it works properly.

6.4 For the double or three-barrel machines, start the other barrel and check whether the machine works properly.

6.5 Check whether the recirculated water device works well.

7.Adjustment

7.1 Adjustment of the gap (see attachment): loosen the six screws under the seat of the barrel and flange, turn the stationary wall clockwise to reduce the gap, and turn counterclockwise to enlarge the gap. Check the gap with a plug gauge. Fasten screws after finishing the adjustment.

7.2 Adjustment of the timing belt: Tighten the check nut of the tensioning wheel on the stationary plate. Remove the outward to release it. Tighten it and check duly while tensioning the wheel in the proper tension.

7.3 Adjustment of timer: discharge the transparent protective cover of the timer, press “+” or “-” to change the letter or number. Each letter stands for H-hour, M-minute, and S-second.

8.Maintenance

8.1 Check whether the gap between the wall and the disc is fit to operate regularly. Avoid putting workpieces that are smaller than the gap to the barrel. Avoid damaging the barrel with sharp pieces.

8.2 Check whether the tightness of the tensioning wheel is fit to operation. Replace it immediately when it is damaged.

8.3 When adjusting the gap between the barrel and the disc, the machine’s nozzle should be added with grease to the left and right nozzle first to ensure the accuracy.

We strongly recommend adding grease every four weeks. Method of adding grease: screw off six lock screws under the flange of barrel seat, turn the adjustable wall counterclockwise to disassemble it. Clean the adjustable wall counterclockwise to disassemble it. Clean the joint faces and add some grease, then turn the barrel back, tighten the six screws.

8.4 If the machine works at fault, stop the machine and check whether any part is damaged. Notify or consult the manufacturer. Do not use the machine until the trouble was resolved.

8.5 The machine should be kept neat and tidy.

9.Process

9.1 Start the machine using the above process; if the machine works properly, then do the following process.

9.2 Select polishing media depends on the shape and material of the workpieces. Put the selected media into the grinding barrel, approximately 12-14L (6Kg-10Kg), wet and dry processes should be both in this range.

9.3 There should be some water added with grinding compound in the tank before starting the machine. Mix the water and grinding compound well. Start the machine. Put the workpieces into the polishing tank one by one after the machine works properly. In the dry polishing process, add polishing media into the barrel, then add some polishing paste into the media. (the ratio of polishing paste and media is: for the first use, the polishing paste quantity should be 2%-3% of the polishing media. For the second use, the polishing paste should be 0.1%-0.2% of the polishing media). Start the machine. Mix the media and polishing paste well, then add the workpieces one by one.

9.4 Set the working time according to your requirement. The machine is with the timing function. Set the working time and according to the process, clean and replace the contamination in the deposit tank regularly. Ensure the water cleanliness in the tank.

9.5 In the wet grinding process, clean and replace the contamination in the deposit tank regularly. Ensure the water cleanliness in the deposit tank.

9.6 Discharge the media and workpiece into the screen after each process is finished. The screened workpiece should be protected carefully, avoid colliding each other. Clean the workpiece with clear water. Do the next process after drying the workpiece.

9.7 After the dry polishing process, the workpiece should be cleaned in an ultrasonic cleaner to remove the grease and contamination. Do the next process after drying the workpiece.

10.Process of the Gold and Silver

LDG series high-precision centrifugal disc finishing machine is a compact unit that has two process units, comprising of dry polishing and wet grinding procedures. It is a new and high-efficiency polishing machine to finish platinum, K gold, silver, brass, titanium, and alloy jewelry. It is higher efficiency, less cost, more uniform effect, more gentle luster compared with conventional handling process.

The whole process adopts many grades of the procedure. Changes the surface of the jewelry from rough to fine. Finally, finish in the polishing process.

10.1 Warning

Before processing in the polishing tank, gold and silver jewelry should be filed, shaped and cut sprue after casting (do not leave deep curve).

In the wet process, the work capacity is approximately 500g around (depends on the workpiece size). The quantity should not exceed 500g.

Select the grinding media, polishing media, grinding compound and polishing paste according to material, shape and condition of the workpiece.

In the dry polishing process, the ratio of the polishing media and polishing paste should not be less than 10:1 (depends on practical condition).

In the dry polishing process, the workpiece that’s heavier than 5-6g or big workpiece cannot be polished in this machine to avoid colliding with each other and damage. Suggest polish individually by hand.

10.2 Wet grinding

We suggest using the P series grinding media (plastic media). There are various grades: very rough,  rough, medium, medium-fine, fine, and the finest. The procedure is as follows:

a. After shaping and removing and smoothing the sprue (very rough grinding): select cone plastic media or tetrahedral plastic media individually, or mix cone (very rough) with tetrahedral (very rough); or select cone (rough) with tetrahedral (rough).

b. After the above procedure or sanded by 400# sanding paper: select cone plastic media or tetrahedral plastic media (medium grinding) individually to use or mix cone (medium) with tetrahedral (medium); cone plastic media and tetrahedral plastic media (medium/fine grinding) also can be selected to use, or mixed cone (medium fine) with tetrahedral (medium finer). Selecting which one depends on the condition and requirement of the workpiece.

c. After the above procedure or sanded by 600#-800# sanding paper: cone plastic media or  tetrahedral plastic media (fine grinding) can be selected individually to use, or mix cone (finer) with tetrahedral (finer); cone plastic media or tetrahedral plastic media (the finest grinding) also can be selected individually to use, or mix cone (the finest) with tetrahedral (the finest). Selecting which one depends on the condition and requirement of the workpiece.

d. After above procedure or sanded by 1000#-1200# sanding paper: cone plastic media or tetrahedral plastic media (the finest grinding) can be selected individually to use, or mix cone with tetrahedral . Select which one depends on the condition and requirement of the workpiece.

10.3 Dry polishing

We recommend using dry polishing media W (walnut shell) series and C (corn cob) series in the dry polishing process. After adding polishing media, add some polishing paste into the media. (The ratio of polishing paste is: for the first use, the polishing paste quantity should be 2%-3% of the polishing media; for the second use, the polishing paste should be 0.1%-0.2% of the polishing media.) Start the machine. Mix the media and the paste well, then put the workpiece one by one. The procedure is as follows.

a. After the above (10.2) wet grinding procedure, the surface of the workpiece is fine, after assuring that the polishing paste and polishing media have been mixed well, start the machine, put the dried workpiece to the barrel one by one. The media size and grinding process time depends on the condition and requirement of the workpiece. Suggest polishing for 1-2 hour or longer.

b. For gold or silver jewelry that has been placed too long, or the surface has become gray (oxidation), can be polished in the barrel directly. Polish for 30 minutes to 1 hour, the workpiece will be renewed.

c. For the first time use, add new polishing paste as above method.

d. When finishing the platinum, titanium alloy, and stainless steel jewelry, add a polishing compound every 1-1.5 hours. When finishing gold, silver, brass, and alloy jewelry, add a polishing compound every 1.5-2 hours.

The media can be used for 60-80 hours before being replaced. If used too long, it will affect the result. Replace it in time.

11. The Secret Of Successful Polishing

When finishing using a polishing machine, machine choice, media compound, and process are the main factors of success. In jewelry manufacturing, one should pay attention to the process. Personnel is the most important factor. Summarize and create rational and perfect processing technology in practice, will just make your products perfectly and gain the business opportunity.

PANEL OPERATING OF INVERTER

Fig

VA20 Gap Adjustment Illustration

Gap Value Set In Factory:

Range of Gap Value for Wet Grinding: 0.10~0.20mm.

Range of Gap Value for Wet Grinding: 0.05~0.10mm.

Function of Screw:

1. Inner Hexagon Corrugated Screw; 1. Used for adjusting and set gap value. 2. Support the upper adjustable barrel.

2. Inner Hexagon Screw: 1. To avoid the slide trend of the adjustable barrel. 2. To pull the adjustable barrel, the power of the pull affect the gap value directly. Indicate when turning the adjustable barrel clockwise or anticlockwise to make the corrugated screw move one step; the gap will reduce or enlarge 0.035mm.

Method of Gap Adjustment:

1. Adjust the six corrugated screws evenly by compressing 1/3.

2. Unscrew the six inner hexagon screw under the flange, turn the adjustable barrel clockwise to reduce the gap, turn counterclockwise to enlarge the gap.

3. Measure the gap by means of the plug gauge, you can adjust the gap to the maximum value in the range first (due to the adjustable barrel and the barrel base matched by screws so there may be gap discrepancy of the circle), then adjust the gap by means of the six inner hexagon corrugated screws little by little.

VA20 High Precision Centrifugal Disc Finishing Machine Circuit Diagram

polishing machine buffing machine

 

 

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