Cast iron flat plate

The function of cast iron flat plates:

Cast iron flat plates are mainly used as a benchmark for checking the error of workpieces.Cast iron flat plates play a crucial role in the mechanical manufacturing process and are the basic benchmark tool for pre factory inspection of each workpiece.

Specification requirements for large cast iron flat plates:

The hardness of the cast iron flat working face is HB107-240.After two manual treatments(manual extension of 600-700 degrees or natural aging of 2-3 years),the stability of the product is maintained.Good.

Cast iron flat plate material:cast iron HT200-300

Cast iron flat plate specification:100*100--3000*6000.(Platforms larger than this specification can be assembled and used or customized according to drawings)

Precision of cast iron flat plates:Follow the standard metrological verification regulations.There are four levels:0,1,2,and 3.

Analysis of technical requirements for cast iron flat plates:

1.On the two opposite sides of the flat plate,there should be threaded holes(or cylindrical holes)for installing handles or lifting ring devices,and the design of the device position should minimize deformation caused by handling.

2.The flat panel should be demagnetized and treated for stability.

3.Flat working surfaces usually use scraping technology.The maximum allowable surface roughness Ra for a Level 3 flat working surface processed by scraping is 5μM.

4.The flat plate should be made of fine gray cast iron and other materials,and its working surface hardness should be 170-240HB.

5.On flat working surfaces with precision levels of 0-3,sand holes with a diameter less than 15mm are allowed to be blocked with the same material,and their hardness should be less than that of the surrounding materials.There should be no more than 4 sand holes blocked in the working face,and the distance between the sand holes should not be less than 80mm.

6.The casting surface of the flat plate should be clear and flat with sand,and the paint should be firm.

7.The flat working surface shall not have defects such as sand holes,pores,cracks,slag inclusions,shrinkage,scratches,bumps,embroidery points,etc.that seriously affect the appearance and performance.

8.If a threaded hole(or groove)is set on the flat working surface,its position should not be higher than the working surface.

Precautions for cast iron flat plates:

The tablet needs to be installed and debugged during use.Then,wipe the working surface of the tablet clean and use it after confirming that there are no problems.During use,be careful to avoid excessive collision between the workpiece and the working surface of the tablet to prevent damage to the working surface of the tablet;The weight of the workpiece should not exceed the rated load of the flat plate,otherwise it may cause a decrease in work quality,damage the structure of the flat plate,and even cause deformation of the flat plate,making it unusable.

In order to improve the service life and working accuracy of the tablet,it is recommended to scrape or control it above 0.02mm,so that the tablet has a longer service life and calibration cycle.According to relevant information on scraping and grinding,as well as the data obtained from scraping and grinding,this process processing requirement can be achieved.The control of contact spot area is stipulated in the British standard specifications for flat plates and platforms,which stipulate that the support area ratio for A(equivalent to JJG 117-91 regulation level 0)and(equivalent to JJG 117-91 regulation level 1)flat plates shall not be less than 20%,and the support area ratio for B(equivalent to JJG 117-91 regulation level 2)flat plates shall not be less than 10%.The high points should be evenly distributed,and the proportion of supporting area should not be high enough to cause adhesion of the workpiece.This regulation not only ensures the accuracy of tablet usage,but also takes into account the lifespan of the tablet,which can be referenced.

How to improve the service life of cast iron flat plates?

1.In order to prevent deformation of the cast iron plate,when lifting the cast iron plate,four steel wire ropes of the same length should be used to hang the four lifting holes on the cast iron plate at the same time,and the cast iron plate should be smoothly lifted onto the transportation vehicle.

2.Pad and level the support points of the cast iron flat plate,ensuring that each support point is evenly stressed and the entire cast iron flat plate is stable.

3.When installing the cast iron flat plate,the various support points of the cast iron flat plate are padded and compacted with adjusting shims,and the technical personnel adjust the cast iron flat plate to a qualified accuracy.

4.When using cast iron flat plates,handle the workpieces with care and do not move rough workpieces on them to avoid damage such as bumps and scratches on the working surface of the cast iron flat plates.

5.In order to prevent the overall deformation of the cast iron flat plate,after use,the workpiece should be removed from the cast iron flat plate to avoid the deformation of the cast iron flat plate caused by long-term heavy pressure on the workpiece.

6.When the cast iron flat plate is not in use,the working surface should be cleaned in a timely manner,then coated with a layer of anti rust oil,and covered with anti rust paper.The cast iron flat plate should be covered with the outer packaging of the cast iron flat plate to prevent damage to the working surface of the cast iron flat plate due to carelessness.

7.Cast iron flat plates should be installed in a ventilated and dry environment,away from heat sources,corrosive gases,and liquids.

8.Cast iron flat plates are subject to regular weekly inspections according to standards,and the verification period can be 6-12 months depending on specific circumstances.