阅读说明：本技术 一种法兰滚动轴承外圈的磨削工艺 (Grinding process of flange rolling bearing outer ring ) 是由 彭如彬 祝子平 于 2021-07-28 设计创作，主要内容包括：本发明提供了一种法兰滚动轴承外圈的磨削工艺,包括如下步骤：机床检查步骤；准备步骤；打磨步骤；钻孔步骤；研磨步骤；酸洗步骤,将研磨步骤完成后的法兰中间件浸入酸液中进行酸洗,去除法兰中间件上残存的氧化层；精磨步骤,得到法兰成品；成品检查步骤,从夹具上取下法兰成品进行检测,区分合格品和次品,完毕。通过机床检查步骤的检查操作,提前发现隐患,提高了磨削时操作人员的安全提供保障,设置酸洗步骤,利用酸液去除钢铁表面上的氧化物和锈蚀物,露出洁净的金属表面,同时使得法兰表面钝化,提高产品表面图层与产品本身的附着力,设置二次精磨,提高了产品的精度,减少了产品的次品率,从而降低了企业的生产成本。(The invention provides a grinding process of a flange rolling bearing outer ring, which comprises the following steps: checking a machine tool; a preparation step; polishing; drilling; grinding; an acid pickling step, namely soaking the flange intermediate member after the grinding step into acid liquor for pickling to remove the residual oxide layer on the flange intermediate member; fine grinding to obtain a flange finished product; and a finished product inspection step, namely taking the finished flange product off the clamp for detection, and distinguishing qualified products from defective products. Through the inspection operation of lathe inspection step, discover hidden danger in advance, operating personnel's safety provides the guarantee when having improved the grinding, sets up the pickling step, utilizes acidizing fluid to get rid of oxide and corrosion on the steel surface, exposes clear metal surface, makes flange surface passivation simultaneously, improves the adhesive force of product surface picture layer and product itself, sets up the secondary and correct grinding, has improved the precision of product, has reduced the defective percentage of product to the manufacturing cost of enterprise has been reduced.)

1. A grinding process of an outer ring of a flange rolling bearing is characterized in that: the method comprises the following steps:

checking the machine tool, namely checking whether each part of the machine tool is damaged or not and whether the machine tool runs well or not;

a preparation step, fixing the rough blank on a clamp of a machine tool; short-starting the machine tool and checking whether the clamping is firm;

a polishing step, wherein the outer surface of the rough blank is coarsely ground, and an oxide layer and burrs are removed;

drilling, namely drilling holes on the rough blank to form a flange intermediate piece;

grinding, namely grinding the outer surface of the flange intermediate piece and the inner wall of the hole;

an acid pickling step, namely soaking the flange intermediate member after the grinding step into acid liquor for pickling to remove the residual oxide layer on the flange intermediate member;

a fine grinding step, namely polishing the flange intermediate after the pickling step again to smooth the surface of the flange intermediate to obtain a flange finished product;

and a finished product inspection step, namely taking the finished flange product off the clamp for detection, and distinguishing qualified products from defective products.

2. The grinding process of the flange rolling bearing outer ring according to claim 1, characterized in that: the pickling step comprises the following steps:

pickling with hydrochloric acid, namely completely immersing the flange intermediate piece into a hydrochloric acid solution with the volume ratio of 20-80%, wherein the immersion time is 5 min;

a neutralizing step, namely putting the pickled flange intermediate piece into a neutralizing liquid to neutralize the acid liquor remained on the surface;

and a cleaning step, namely washing the neutralized flange intermediate piece with clear water to remove surface residues.

The neutralizing solution is sodium bicarbonate solution, the time for immersing in the neutralizing solution is not less than 10min, and the cleaning time in the cleaning step is not less than 15 min.

3. The grinding process of the flange rolling bearing outer ring according to claim 1, characterized in that: the machine tool inspection step includes:

checking the machine tool, namely checking whether the program processed by the machine tool last time is operated and whether a product exists on the clamp or not, checking the grinding wheel cover and determining whether the grinding wheel cover is intact or not;

checking the grinding wheel, namely checking the surface of the grinding wheel to determine that the grinding wheel has fracture and abrasion conditions, starting the grinding wheel to idle for 1-2 min, confirming that the grinding wheel rotates normally, and closing the grinding wheel after the grinding wheel operates normally;

and lubricating, namely filling lubricating oil to each part of the machine tool before the machine tool is started to ensure that the machine tool runs smoothly.

4. The grinding process of the flange rolling bearing outer ring according to claim 1, characterized in that:

the preparing step includes:

a clamping step, namely placing a gasket between a clamp and a workpiece of the machine tool, making up a gap between the clamp and the workpiece, and screwing a limiting bolt;

and a short starting step, namely, short starting the machine tool 2S-3S to enable the clamp to rotate, and checking whether the clamp clamps the workpiece or not by using the started centrifugal force.

5. The grinding process of the flange rolling bearing outer ring according to claim 1, characterized in that: in the polishing step, a grinding wheel is used for carrying out rough grinding, the precision of the grinding wheel is 40-60 meshes, the linear speed of the grinding wheel is 30m/s, the horizontal feeding amount is 40mm/min, the vertical feeding amount is 0.08mm, and meanwhile, cooling liquid is started to cool the grinding wheel.

6. The grinding process of the flange rolling bearing outer ring according to claim 1, characterized in that: the drilling step comprises:

drilling: drilling holes by using a straight shank twist drill to drill blank holes;

boring: and (5) performing finish machining on the drilled blank hole by using a reamer.

7. The grinding process of the outer ring of the flange rolling bearing according to claim 5, characterized in that: the cooling liquid is saponified liquid with the concentration of 5-20%.

8. The grinding process of the flange rolling bearing outer ring according to claim 1, characterized in that: in the fine grinding step, a grinding wheel is used for fine grinding, the precision of the grinding wheel is 80-100 meshes, the linear speed of the grinding wheel is 50m/s, the horizontal feeding amount is 65mm/min, and the vertical feeding amount is 0.5 mm.

9. The grinding process of the flange rolling bearing outer ring according to claim 1, characterized in that: and in the finished product inspection step, whether the surface of the workpiece has grinding wheel flowers is inspected, if the surface has the grinding wheel flowers, the workpiece is a defective product, if the surface has no grinding wheel flowers, the workpiece is a qualified product, and the qualified product is warehoused.

Technical Field

The invention relates to a grinding process, in particular to a grinding process of an outer ring of a flange rolling bearing.

Background

Grinding is a mechanical processing method for removing materials, and the existing grinding process flow of the outer ring of the flange rolling bearing is as follows: forging → turning → heat treatment → end face grinding → excircle grinding → outer groove grinding → excircle grinding → boring → deburring → final inspection, because the requirement of the flange rolling bearing on the grinding process is high, the prior art only uses one-time grinding, the surface smoothness of the finished product is not enough, and the surface coating is easy to fall off, thereby the workpiece is easy to corrode and the service life is shortened.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a grinding process of a flange rolling bearing outer ring with high grinding precision.

The invention is realized by adopting the following technical scheme: a grinding process of an outer ring of a flange rolling bearing is characterized in that: the method comprises the following steps:

checking the machine tool, namely checking whether each part of the machine tool is damaged or not and whether the machine tool runs well or not;

a preparation step, fixing the rough blank on a clamp of a machine tool; short-starting the machine tool and checking whether the clamping is firm;

a polishing step, wherein the outer surface of the rough blank is coarsely ground, and an oxide layer and burrs are removed;

drilling, namely drilling holes on the rough blank to form a flange intermediate piece;

grinding, namely grinding the outer surface of the flange intermediate piece and the inner wall of the hole;

an acid pickling step, namely soaking the flange intermediate member after the grinding step into acid liquor for pickling to remove the residual oxide layer on the flange intermediate member;

a fine grinding step, namely polishing the flange intermediate after the pickling step again to smooth the surface of the flange intermediate to obtain a flange finished product;

and a finished product inspection step, namely taking the finished flange product off the clamp for detection, and distinguishing qualified products from defective products.

The machine tool inspection step includes:

checking the machine tool, namely checking whether the cutter interferes with the product, whether the last machining program is operated, whether the product exists on the clamp, checking the grinding wheel cover and determining whether the grinding wheel cover is intact;

checking the grinding wheel, namely checking the surface of the grinding wheel to determine that the grinding wheel is broken and worn, starting the grinding wheel to idle for one to two minutes, confirming that the grinding wheel rotates normally, and closing the grinding wheel after the grinding wheel operates normally; before the machine tool is started, lubricating oil is filled into all parts of the machine tool.

The preparing step includes:

a clamping step, namely placing a gasket between a clamp and a workpiece of the machine tool, making up a gap between the clamp and the workpiece, and screwing a limiting bolt;

and a short starting step, namely, short starting the machine tool 2S-3S to enable the clamp to rotate, and checking whether the clamp clamps the workpiece or not by using the started centrifugal force.

In the polishing step, a grinding wheel is used for carrying out rough grinding, the precision of the grinding wheel is 40-60 meshes, the linear speed of the grinding wheel is 30m/s, the horizontal feeding amount is 40mm/min, the vertical feeding amount is 0.08mm, and meanwhile, cooling liquid is started to cool the grinding wheel. The cooling liquid is saponified liquid with the concentration of 5-20%.

The drilling step comprises:

drilling: drilling holes by using a straight shank twist drill to drill blank holes;

boring: and (5) performing finish machining on the drilled blank hole by using a reamer.

The pickling step comprises the following steps:

pickling with hydrochloric acid, namely completely immersing the flange intermediate piece into a hydrochloric acid solution with the volume ratio of 20-80%, wherein the immersion time is not less than 5 min;

a neutralizing step, namely putting the pickled flange intermediate piece into a neutralizing liquid to neutralize the acid liquor remained on the surface;

and a cleaning step, namely washing the neutralized flange intermediate piece with clear water to remove surface residues.

The neutralizing solution is sodium bicarbonate solution, the time for immersing in the neutralizing solution is not less than 10min, and the cleaning test of the cleaning step is not less than 15 min.

In the fine grinding step, a grinding wheel is used for fine grinding, the precision of the grinding wheel is 80-100 meshes, the linear speed of the grinding wheel is 50m/s, the horizontal feeding amount is 65mm/min, and the vertical feeding amount is 0.5 mm.

And in the finished product inspection step, whether the surface of the workpiece has grinding wheel flowers is inspected, if the surface has the grinding wheel flowers, the workpiece is a defective product, if the surface has no grinding wheel flowers, the workpiece is a qualified product, and the qualified product is warehoused.

Compared with the prior art, the method has the advantages that the acid pickling step is arranged, oxide and rust on the surface of the steel are removed by using the acid liquor, the clean metal surface is exposed, the surface of the flange is passivated, the adhesive force between the coating on the surface of the product and the product is improved, the coating is not easy to fall off, the service life of the coating is prolonged, the operation of the machine tool inspection step is arranged, the problems possibly existing in the machine tool are inspected before grinding, the hidden danger is found in advance, and the safety of operators during grinding is improved and guaranteed.

Detailed Description

The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, any combination between the embodiments or technical features described below may form a new embodiment.

A grinding process for an outer ring of a flange rolling bearing comprises the following steps:

checking the machine tool, namely checking whether each part of the machine tool is damaged or not and whether the machine tool runs well or not;

a preparation step, fixing the rough blank on a clamp of a machine tool; short-starting the machine tool and checking whether the clamping is firm;

a polishing step, wherein the outer surface of the rough blank is coarsely ground, and an oxide layer and burrs are removed;

drilling, namely drilling holes on the rough blank to form a flange intermediate piece;

grinding, namely grinding the outer surface of the flange intermediate piece and the inner wall of the hole;

an acid pickling step, namely soaking the flange intermediate member after the grinding step into acid liquor for pickling to remove the residual oxide layer on the flange intermediate member;

a fine grinding step, namely polishing the flange intermediate after the pickling step again to smooth the surface of the flange intermediate to obtain a flange finished product;

and a finished product inspection step, namely taking the finished flange product off the clamp for detection, and distinguishing qualified products from defective products.

The machine tool inspection step includes:

checking a machine tool, namely, whether a cutter is interfered with a product, whether a program processed last time is operated and whether the product is on a clamp or not, starting a high-pressure air gun, cleaning an operation table once, preventing the surface of a workpiece from being scratched by scraps, closing the high-pressure air gun, checking a grinding wheel cover and determining whether the grinding wheel cover is intact or not;

checking the grinding wheel, namely checking the surface of the grinding wheel to determine that the grinding wheel is broken and worn, starting the grinding wheel to idle for one minute, confirming that the grinding wheel rotates normally, and closing the grinding wheel after the grinding wheel operates normally; before the machine tool is started, lubricating oil is filled into all parts of the machine tool.

The preparing step includes:

a clamping step, namely placing a gasket between a clamp and a workpiece of the machine tool, making up a gap between the clamp and the workpiece, and screwing a limiting bolt;

and a short starting step of short starting the machine tool 2S to rotate the clamp, and checking whether the clamp clamps the workpiece by using the started centrifugal force.

The grinding step is characterized in that a grinding wheel is used for carrying out rough grinding, the grinding wheel is a 40-60-mesh grinding wheel, the linear speed of the grinding wheel is 30m/s, the horizontal feeding amount is 40mm/min, the vertical feeding amount is 0.08mm, the grinding time is preferably controlled within 10min, when the 40-mesh grinding wheel is used, the surface smoothness of a product cannot meet the requirement, multiple times of grinding are needed, and therefore the processing time is prolonged. The cooling liquid is saponified liquid with the concentration of 5-20%.

The drilling step comprises:

drilling: drilling holes by using a straight shank twist drill to drill blank holes;

boring: and (5) performing finish machining on the drilled blank hole by using a reamer.

And in the grinding step, the fine pits generated after the grinding process are ground flat, so that the surface of the product has no fine pits.

The pickling step comprises the following steps:

pickling with hydrochloric acid, namely completely immersing the flange intermediate piece into a hydrochloric acid solution with the volume ratio of 20-80%, wherein the immersion time is not less than 5 min;

a neutralizing step, namely putting the pickled flange intermediate piece into a neutralizing liquid to neutralize the acid liquor remained on the surface;

and a cleaning step, namely washing the neutralized flange intermediate piece with clear water to remove surface residues.

In the hydrochloric acid pickling step, the pickling time is preferably controlled within 5min, so that the pickling time of 5min is adopted, when a hydrochloric acid solution with the volume ratio of 20%, a large amount of residues appear on the surface oxide layer of the flange intermediate part, when a hydrochloric acid solution with the volume ratio of 80% is adopted, the surface oxide layer of the flange intermediate part completely disappears, but the surface of the flange intermediate part is corroded, pits appear, when a hydrochloric acid solution with the volume ratio of 60% is adopted, the surface oxide layer of the flange intermediate part completely disappears, and the surface of the flange intermediate part is not corroded, so that the hydrochloric acid solution with the volume ratio of 60% is preferably adopted when the pickling time is 5 min.

The neutralizing solution is sodium bicarbonate solution, the time for immersing in the neutralizing solution is not less than 10min, and the cleaning test of the cleaning step is not less than 15 min.

In the fine grinding step, a grinding wheel is used for fine grinding, the grinding wheel has the precision of 90 meshes, the linear speed of the grinding wheel is 50m/s, the horizontal feeding amount is 65mm/min, and the vertical feeding amount is 0.5 mm.

And in the finished product inspection step, whether the surface of the workpiece has grinding wheel flowers is inspected, if the surface has the grinding wheel flowers, the workpiece is a defective product, if the surface has no grinding wheel flowers, the workpiece is a qualified product, and the qualified product is warehoused.

Compared with the prior art, the method has the advantages that the acid pickling step is arranged, oxide and rust on the surface of the steel are removed by using the acid liquor, the clean metal surface is exposed, the surface of the flange is passivated, the adhesive force between the coating on the surface of the product and the product is improved, the coating is not easy to fall off, and the service life of the coating is prolonged.

The method has the advantages that the machine tool inspection operation step is arranged, the problems possibly existing in the machine tool are checked before grinding, hidden dangers are found in advance, the safety of operators during grinding is guaranteed, the defective rate of products is reduced, and therefore the production cost of enterprises is reduced.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.