CN115319616A - Sanding tool and sanding method - Google Patents

Abstract

The application discloses a sanding tool and a sanding method, relates to the technical field of automobile part processing, and comprises a sanding head, a sanding block, a connecting rod and a telescopic driving device; the sanding head is formed by radially and tangentially forming a plane on the side surface of a cylindrical structure, a sanding block is arranged on one side of the sanding head, which is tangent to the plane on the side surface, the sanding block is arc-shaped, and the arc-shaped surface of the sanding block is adaptive to the curvature radius of the cylinder sleeve; the sand grinding block is provided with waterproof sand paper; the one end of head passes through the connecting rod and connects the head rod, and the telescopic link is connected to the head rod, and the telescopic link has the contained angle with the head rod, and the telescopic link still is connected the second connecting rod, and the direction of second connecting rod is the same with the direction of motion of head rod and head rod, and flexible drive arrangement is connected to the one end of second connecting rod. This application has realized automated control dull polish, and the in-process effort at actual dull polish is even.

Description

Sanding tool and sanding method

Technical Field

The application relates to the technical field of automobile part processing, in particular to a sanding tool and a sanding method.

Background

The cylinder sleeve is a cylindrical part, is arranged in a cylinder body hole of the engine body and is fixedly pressed by a cylinder cover, the piston reciprocates in the cylinder sleeve, and the cylinder sleeve always generates high-speed sliding friction with the piston ring and the piston part.

In order to prolong the service life of a cylinder-piston assembly and improve the running-in performance, for a cylinder, besides developing wear-resistant materials, proper surface treatment is carried out on the inner wall of a cylinder sleeve, which is a feasible and important approach.

After the engine cylinder sleeve is phosphated, a phosphating layer of the cylinder sleeve needs to be sanded, so that the oil content of the surface of the phosphating layer is measured, and the purpose is to ensure that a certain oil film is in the cylinder sleeve after the engine is stopped, so that the risk of strain is reduced after the engine is restarted; the manual pressure sanding mode is generally adopted to sand the phosphate coating on the surface of the cylinder sleeve, so that the pressure applied in each sanding process is uncontrollable.

Disclosure of Invention

The embodiment of the application provides a sanding tool and a sanding method thereof, solves the problem that after phosphorization of an engine cylinder sleeve in the prior art, sanding of the surface of the phosphorization layer of the cylinder sleeve needs to be carried out in a manual pressure applying sanding mode, pressure applying in each sanding process is not controllable, automatic control sanding is realized, and acting force is even in the actual sanding process.

In a first aspect, embodiments of the present invention provide a sanding tool, including a sanding head, a sanding block, a connecting rod, and a telescopic driving device;

the sanding head is formed by radially and tangentially forming a plane on the side surface of a cylindrical structure, a sanding block is arranged on one side of the sanding head, the side surface of the sanding head is tangentially formed into the plane, the sanding block is arc-shaped, and the arc-shaped surface of the sanding block is matched with the curvature radius of the cylinder sleeve; the sand grinding block is provided with waterproof sand paper;

the one end of sand-grinding head passes through the connecting rod and connects the head rod, the head rod connects the telescopic link, the telescopic link with the head rod has the contained angle, the telescopic link still connects the second connecting rod, the direction of second connecting rod with the head rod and its the direction of motion of sand-grinding head is the same, just flexible drive arrangement is connected to the one end of second connecting rod.

With reference to the first aspect, in a possible implementation manner, a direction of a center of the sanding block perpendicular to an inner wall of the cylinder sleeve grinding position is the same as a stretching direction of the telescopic rod.

In combination with the first aspect, in one possible implementation, the surface of the sanding block is bonded with waterproof abrasive paper, and the waterproof abrasive paper comprises an anti-blocking layer, a sanding layer, a first double-sided adhesive layer, a waterproof layer, a second double-sided adhesive layer, a toughness layer and a third double-sided adhesive layer from top to bottom.

With reference to the first aspect, in one possible implementation manner, the surface of the sanding layer comprises sand grains and synthetic glue, and the sand grains are made of silicon carbide materials.

With reference to the first aspect, in a possible implementation manner, the sand grain size of the waterproof sand paper is 800 degrees.

With reference to the first aspect, in one possible implementation manner, the sanding head and the sanding block are made of steel.

In a second aspect, the present invention provides a method of sanding a sanding tool, comprising the steps of:

s1, taking an area with the width of 25mm and the length of 55mm at a specified position of a cylinder sleeve, acting for 2min by using 98% concentrated sulfuric acid, then sucking and drying by using a cotton ball, spraying distilled water to clean a measurement part and the periphery of the measurement part after sucking and drying, sucking and drying by using the cotton ball, and wearing rubber gloves when using the concentrated sulfuric acid;

s2, adhering the waterproof abrasive paper to a sanding block by using a double-sided adhesive tape;

s3, adjusting a telescopic driving device to enable the telescopic driving device to extend to a specified position of the inner wall of the cylinder sleeve, and adjusting a telescopic rod to enable the telescopic rod to drive the sand grinding head to approach to the specified position of the inner wall of the cylinder sleeve until the sand grinding head is close to the specified position of the inner wall of the cylinder sleeve;

s4, the telescopic driving device drives the second connecting rod to move repeatedly in the direction away from or close to the telescopic driving device; sanding is carried out 3 times by 100 times of reciprocating motion of the sanding block, the surface of the sanding block is adapted to the curvature radius of the sanding block, the surface of the waterproof abrasive paper is uniformly stressed, the waterproof abrasive paper only bears the weight of the sanding block, and the waterproof abrasive paper is replaced after each 100 times of reciprocating motion;

and S5, after sanding, spraying distilled water, and sucking with a cotton ball to finish polishing the phosphate coating.

With reference to the second aspect, in one possible implementation, in S1, the sanding location is taken 30 to 40mm from the cylinder liner bottom edge.

With reference to the second aspect, in one possible implementation manner, in S2, the size of the sanding block is smaller than the area of the concentrated sulfuric acid specified by the cylinder liner.

In combination with the second aspect, in one possible implementation, in S4, the stroke of the sanding block is repeated sanding with a stroke of 20 mm.

One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

according to the embodiment of the invention, the curvature radius of the sanding block on the sanding head is the same as that of the inner wall of the cylinder sleeve, after the depth of the sanding head in the sleeve is controlled by using the telescopic driving device, when the sanding block of the sanding head does not contact the inner wall of the cylinder sleeve, the sanding block is controlled to be close to the inner wall of the cylinder sleeve by controlling the extension of the telescopic rod, sanding can be started after the sanding block is just close to a sanding area determined by the inner wall of the cylinder sleeve, sanding is carried out in a fixed area of the inner wall of the cylinder sleeve by using continuous back and forth expansion and contraction of the cylinder, the movement directions of the first connecting rod, the second connecting rod and the sanding head are consistent, the back and forth expansion strokes of the first connecting rod, the second connecting rod and the sanding head are consistent, the surface of the waterproof abrasive paper on the sanding block is uniformly stressed, only the weight of the sanding block is borne, and no other component force increased or reduced by mechanical movement is needed to increase or reduce the pressure of the sanding head.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments of the present invention or the description in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic illustration of a configuration of a sanding tool provided by an embodiment of the present application;

FIG. 2 is a perspective view of a sanding head of the sanding tool provided by an embodiment of the present application;

FIG. 3 is a top, schematic, cross-sectional view of a portion of a sanding tool provided in accordance with an embodiment of the present application;

fig. 4 is a schematic diagram of a configuration of a sanding tool sandpaper as provided by an embodiment of the present application.

An icon: 1-a sand grinding head; 11-sanding block; 2-a connecting rod; 21-a first connecting rod; 22-a telescopic rod; 23-a second connecting rod; 3-a cylinder; 4-cylinder jacket; 5-fixing the base; 6-waterproof abrasive paper; 61-anti-clogging layer; 62-sanding layer; 63-a first double-sided adhesive layer; 64-a waterproof layer; 65-a second double-sided adhesive layer; 66-a ductile layer; 67-third two-sided adhesive layer.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

Referring to fig. 1-4, embodiments of the present invention first provide a sanding tool including a sanding head 1, a sanding block 11, a connecting rod 2, and a telescopic driving device;

the sanding head 1 is formed by radially and tangentially cutting a plane on the side surface of a cylindrical structure, one surface of the sanding head 1, which is cut into the plane on the side surface, is provided with a sanding block 11, the sanding block 11 is arc-shaped, and the arc-shaped surface of the sanding block 11 is adaptive to the curvature radius of the cylinder sleeve 4; the sand grinding block 11 is provided with water sand paper 6;

one end of the sanding head 1 is connected with a first connecting rod 21 through a connecting rod 2, the first connecting rod 21 is connected with a telescopic rod 22, the telescopic rod 22 and the first connecting rod 21 form an included angle, the telescopic rod 22 is perpendicular to the first connecting rod 21, the telescopic rod 22 is further connected with a second connecting rod 23, the direction of the second connecting rod 23 is the same as the moving direction of the first connecting rod 21 and the sanding head 1, and one end of the second connecting rod 23 is connected with a telescopic driving device.

By adopting the scheme, the curvature radius of the sand grinding block 11 on the sand grinding head 1 is the same as that of the inner wall of the cylinder sleeve 4, the depth of the sand grinding head 1 in the cylinder sleeve 4 is controlled by utilizing the telescopic driving device, when the sand grinding block 11 of the sand grinding head 1 is not contacted with the inner wall of the cylinder sleeve 4, the expansion of the telescopic rod 22 can be controlled to control the sand grinding block 11 to be close to the inner wall of the cylinder sleeve 4, after the sand grinding block 11 is just close to a sanding area determined by the inner wall of the cylinder sleeve 4, sanding can be started, the cylinder 3 is utilized to continuously stretch back and forth again, sanding is carried out in a fixed area of the inner wall of the cylinder sleeve 4, the movement directions of the first connecting rod 21, the second connecting rod 23 and the sand grinding head 1 are consistent, the strokes of the back and forth telescopic sand papers are consistent, the surface stress of the water sand grinding block 6 on the sand grinding block 11 is uniform, the weight of the water grinding block 11 is free from any other component force increased due to mechanical movement, so as to increase or decrease the pressure of the grinding head, the automatic control of sanding is realized, the uniform acting force in the actual sanding process of the uniform sanding of the phosphating layer, and the uniform oil-containing layer is uniform, and the error of the sanding process of the uniform sanding can cause the uniform sanding error of the uniform sanding in the sanding process of the uniform sanding.

Specifically, the telescopic driving device of the present invention is implemented by using the cylinder 3, or other devices capable of implementing back and forth telescopic motion may be used, and in addition, the telescopic rod 22 may also be replaced by the cylinder 3, as long as the telescopic function is implemented, the cylinder 3 and the telescopic rod 22 of the embodiment of the present invention are both connected to a control system, and the whole working process is controlled by the control system.

Alternatively, the direction of the center of the sanding block 11 perpendicular to the inner wall of the sanding position of the cylinder liner 4 is the same as the extension and retraction direction of the extension rod 22.

Like this before sanding at sanding block 11 to cylinder jacket 4 inner wall, telescopic link 22 stretches out for sanding block 11 just aims at the area of treating the sanding, realizes accurate sanding.

Optionally, the surface of the sanding block 11 is bonded with the waterproof abrasive paper 6 through a double-sided adhesive tape, and the waterproof abrasive paper 6 comprises an anti-blocking layer 61, a sanding layer 62, a first double-sided adhesive layer 63, a waterproof layer 64, a second double-sided adhesive layer 65, a toughness layer 66 and a third double-sided adhesive layer 67 from top to bottom. The sanding layer 62 is convenient for removing rough tips of the phosphating layer, the first double-sided adhesive layer 63 is used for bonding the sanding layer 62 with the waterproof layer 64, the waterproof layer 64 improves the water resistance of the waterproof abrasive paper 6, and the anti-blocking layer 61 positioned above the sanding layer 62 can effectively prevent the sanded ash from blocking gaps between abrasive materials, so that the service time of the waterproof abrasive paper 6 is prolonged; the anti-blocking layer 61 can be synthesized by 80% of carrier rubber, 15% of silicon nitride and 5% of scale graphite material, the carrier rubber is polyurethane rubber, the scale graphite material is used as a natural fixed body lubricating material, the toughness is good, the silicon nitride has strong high-pressure creep resistance and small thermal expansion coefficient, the silicon nitride and the scale graphite material are added after the polyurethane rubber is melted at high temperature, the compactness of the anti-blocking layer 61 on the whole is good, and meanwhile, the sliding resistance between the friction surfaces is reduced and the smoothness of the friction surfaces is increased under the action of the scale graphite material and the silicon nitride material; the thermal expansion coefficient is small, meanwhile, the deformation caused by friction heat is reduced, and the service life of the waterproof abrasive paper 6 is prolonged; in addition, waterproof layer 64 has toughness layer 66 through second double-sided adhesive layer 65 still bonding, and graphene materials can be chooseed for use on toughness layer 66, because waterproof abrasive paper 6 presents the arc and will cooperate with the arc surface of sanding block 11, still need have certain toughness when not fragile.

Optionally, the surface of the sanding layer 62 includes sand particles and synthetic gum, and the sand particles are selected from silicon carbide materials. The silicon carbide material has high hardness, high grinding capacity, high temperature resistance and oxidation resistance.

Optionally, the sand grain size of the waterproof sand paper 6 is 800 degrees. Intervals are reserved among the sand grains, so that the sand grains are prevented from being easily blocked and the grinding function is prevented from being weakened due to the fact that the sand grains are close to each other, the appearance of the sand grains is conical or round table-shaped, and the grinding effect is enhanced; the selected sand grain has the granularity of 800 degrees, the sand paper is relatively fine, and the polishing effect is better.

When the water sand paper 6 is attached to the surface of the sand grinding block 11, the sand paper is pressed by the self weight of the sand grinding block 11, the surface of the sand grinding block 11 is adapted to the curvature radius of the cylinder sleeve 4, the uniform stress of the surface of the sand paper is ensured, only the weight of the sand grinding block 11 is borne, the pressure of the sand grinding head 1 cannot be increased or reduced due to any other component force increased due to mechanical movement, and when the sand grinding head 1 rotates, the rough tip of a phosphating layer is removed, and the purpose of exposing a basic tissue corroded by acid pickling and phosphating is achieved.

Alternatively, the direction in which the center of the sanding block 11 is perpendicular to the inner wall of the sanding position of the cylinder liner 4 is the same as the extension and retraction direction of the extension bar 22. Therefore, when the telescopic rod 22 stretches, the center of the sanding block 11 faces the inner wall of the cylinder sleeve 4, and the accuracy and the timeliness of the telescopic rod 22 for controlling the sanding block 11 are guaranteed.

Optionally, the sanding head 1 and the sanding block 11 are made of steel. The sanding head 1 and the sanding block 11 are made of 45 steel, and the steel material has high strength, good plasticity and toughness and uniform material quality.

The embodiment of the invention also provides a sanding method of the sanding tool, and the sanding tool comprises the following steps:

s1, at a specified position of a cylinder sleeve 4, taking an area 25mm wide and 55mm long, and setting a sanding area 25mm wide and 55mm wide for the cylinder sleeve 4, wherein the product quality of the cylinder sleeve 4 is not influenced after a new phosphating coating is not needed; treating with 98% concentrated sulfuric acid for 2min, drying with cotton ball, spraying distilled water to clean the measurement part and its periphery, and drying with cotton ball while wearing rubber gloves; the purpose is in order to wash the measuring surface, corrode the phosphating film, it is more convenient to sand, remove the rough pointed end of phosphating film, the purpose of revealing the basic organization corroded by acid cleaning phosphating, suck the concentrated sulfuric acid after corroding at the same time, prevent the influence of residual concentrated sulfuric acid to the waterproof abrasive paper 6 on the sanding block 11;

s2, adhering the waterproof abrasive paper 6 on the abrasive block 11 by using a double-sided adhesive tape;

s3, adjusting the telescopic driving device to enable the telescopic driving device to extend to the specified position of the inner wall of the cylinder sleeve 4, adjusting the telescopic rod 22 to enable the telescopic rod 22 to drive the sand grinding head 1 to approach to the specified position of the inner wall of the cylinder sleeve 4 until the sand grinding head 1 is close to the specified position of the inner wall of the cylinder sleeve 4;

s4, the telescopic driving device drives the second connecting rod 23 to move repeatedly in the direction away from or close to the telescopic driving device; sanding is carried out 3 times by 100 times through the reciprocating motion of the sanding block 11, the surface of the sanding block 11 is adapted to the curvature radius of the sanding block 11, the surface of the waterproof abrasive paper 6 is uniformly stressed, the waterproof abrasive paper 6 only bears the weight of the sanding block 11, and the waterproof abrasive paper 6 is replaced after each 100 times of reciprocating motion; 11 reciprocating motion 3X 100 of sanding block are sanded, the sanding effect is just right, 800 degrees are chooseed for use to the sand grain size of aforementioned water sand paper 6 of adoption, every reciprocating motion 1 time, the area and the sanding degree of the water sand paper 6 of 800 degrees sand grain size are fixed, adopt 3X 100 to combine the area that the sanding was set for after sanding, the sanding degree is the best, furthermore, water sand paper 6 needs to renew after every 100 round trips, because the surface structure design of water sand paper 6, when water sand paper 6 was sanded about 100 times, water sand paper 6's grinding effect just begins to descend greatly, influence the sanding effect, just need in time to change water sand paper 6 this moment, in addition, when sanding 100 times of starting to renew water sand paper 6, need stop the sanding, the number of times of sanding is convenient for the record also, and water sand paper renews after every 100 round trips, must use distilled water to clear up the measurement position before sanding once more.

And S5, after sanding, spraying distilled water, and sucking with a cotton ball to finish polishing the phosphate coating.

According to the sanding method, the depth of the sanding head 1 in the sleeve 2 and the reciprocating motion during the sanding are controlled only by the control system to control the telescopic driving device, and the telescopic rod 22 can control the sanding block 11 on the sanding head 1 to be close to the inner wall of the cylinder sleeve 4 when the sanding block 11 is not close to the inner wall of the cylinder sleeve 4.

Optionally, in S1, the sanding position is taken from 30 to 40mm from the bottom edge of the cylinder liner 4, when the cylinder liner 4 and the piston move, the piston ring on the piston and the cylinder liner 4 move relatively, and 30 to 40mm is the range of the starting position of the piston ring movement, and the starting position of the piston ring movement has oil volume, so that the measurement from this position is more accurate, and the measurement is not affected by the measurement after the area without oil content is sanded.

Optionally, the surface size of the sanding block 11 is smaller than the area of concentrated sulfuric acid applied to the cylinder liner 4, the surface size of the sanding block 11 is 20 × 40mm, the weight of the sanding block 11 is 3kg, and the size of the sanding block 20 × 40mm is just slightly smaller than the area of the cylinder liner 4 with the width of 25mm and the length of 55mm at the set position, so that when sanding in the set sanding area, the area outside the set sanding area is not affected, and the influence on other areas of the cylinder liner 4 is avoided; and the sanding block 11 weighs 3kg, so that when sanding, the sanding area only bears the weight of the sanding block 11, the force of the sanding block 11 is not too small or too large, and the sanding is uniform and good in effect.

Optionally, the stroke of the sanding block 11 is repeatedly sanded by a stroke of 20mm, when the sanding stroke is 20mm, the corresponding sanded surface does not affect the quality of the cylinder sleeve 4, after sanding in a specified measurement area, the phosphating coating does not need to be plated again, and the cylinder sleeve 4 can be used normally; otherwise, the quality of the cylinder liner 4 may be affected when sanding over long distances.

The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure.

Claims (10)

1. A sanding tool is characterized by comprising a sanding head (1), a sanding block (11), a connecting rod (2) and a telescopic driving device;

the sanding head (1) is formed by radially and tangentially forming a plane on the side surface of a cylindrical structure, a sanding block (11) is arranged on one surface of the sanding head (1) with the side surface tangent to the plane, the sanding block (11) is arc-shaped, and the arc-shaped surface of the sanding block (11) is adapted to the curvature radius of the cylinder sleeve (4); the sand grinding block (11) is provided with waterproof sand paper (6);

connecting rod (2) connection head rod (21) is passed through to the one end of sand bistrique (1), telescopic link (22) is connected in head rod (21), telescopic link (22) with head rod (21) has the contained angle, second connecting rod (23) are still connected in telescopic link (22), the direction of second connecting rod (23) with head rod (21) and its the direction of motion of sand bistrique (1) is the same, just flexible drive arrangement is connected to the one end of second connecting rod (23).

2. Sanding tool according to claim 1, characterized in that the direction in which the centre of the sanding block (11) is perpendicular to the inner wall of the sanding position of the cylinder liner (4) is the same as the extension and retraction direction of the extension rod (22).

3. A sanding tool as defined in claim 1, characterized in that the sanding block (11) has a surface to which is bonded a waterproof abrasive paper (6), the waterproof abrasive paper (6) comprising, from top to bottom, an anti-clogging layer (61), a sanding layer (62), a first layer of double-sided glue (63), a water-repellent layer (64), a second layer of double-sided glue (65), a tough layer (66) and a third layer of double-sided glue (67).

4. A sanding tool as defined in claim 3, characterized in that the surface of the sanding layer (62) comprises sand grains and synthetic glue, the sand grains being selected from the group of silicon carbide materials.

5. Sanding tool according to claim 4, characterized in that the sandpaper (6) has a grit size of 800 degrees.

6. Sanding tool according to claim 1, characterized in that the sanding head (1) and the sanding block (11) are both made of steel.

7. A method of sanding using the sanding tool of any of claims 1-6, comprising the steps of:

s1, taking an area with the width of 25mm and the length of 55mm at a specified position of a cylinder sleeve, acting for 2min by using 98% concentrated sulfuric acid, then sucking and drying by using a cotton ball, spraying distilled water to clean a measurement part and the periphery of the measurement part after sucking and drying, sucking and drying by using the cotton ball, and wearing rubber gloves when using the concentrated sulfuric acid;

s2, adhering the waterproof abrasive paper (6) to a sand grinding block (11) by using a double-sided adhesive tape;

s3, adjusting a telescopic driving device to enable the telescopic driving device to extend to a specified position of the inner wall of the cylinder sleeve (4), and adjusting a telescopic rod (22) to enable the telescopic rod (22) to drive the sand grinding head (1) to approach to the specified position of the inner wall of the cylinder sleeve (4) until the sand grinding head (1) is close to the specified position of the inner wall of the cylinder sleeve (4);

s4, the second connecting rod (23) is driven by the telescopic driving device to move repeatedly in the direction away from or close to the telescopic driving device; sanding is carried out 3 times by 100 times of reciprocating motion of the sanding block (11), the surface of the sanding block (11) is adapted to the curvature radius of the sanding block (11), the surface of the waterproof abrasive paper (6) is uniformly stressed, the waterproof abrasive paper (6) only bears the weight of the sanding block (11), and the waterproof abrasive paper (6) is replaced after every 100 times of reciprocating motion;

and S5, after sanding is finished, spraying distilled water to clean, and sucking dry by using a cotton ball to finish polishing of the phosphate coating.

8. The sanding method according to claim 7, characterized in that in S1 the sanding position is taken 30-40 mm from the bottom edge of the cylinder liner (4).

9. Sanding method according to claim 7, characterized in that in S2 the sanding block (11) has a bottom surface of a size smaller than the area intended for concentrated sulfuric acid to act on the cylinder liner.

10. The sanding method according to claim 7, characterized in that in S4 the stroke of the sanding block (11) is repeated sanding with a stroke of 20 mm.

Images