CN112643516A - Polishing method for concave surface of inverted product - Google Patents
Polishing method for concave surface of inverted product Download PDFInfo
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- CN112643516A CN112643516A CN202011480843.8A CN202011480843A CN112643516A CN 112643516 A CN112643516 A CN 112643516A CN 202011480843 A CN202011480843 A CN 202011480843A CN 112643516 A CN112643516 A CN 112643516A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
- B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
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Abstract
The invention provides a polishing method for an inner concave surface of a reverse-buckled product, which adopts a polishing wheel which is designed by copying with the inner concave surface of the product to polish; the polishing method comprises the following steps: 1) placing a product subjected to one-time hot bending molding in a product cavity of a polishing machine, enabling the inner concave surface of the product to be upward, and arranging a polishing wheel and the product below the polishing wheel in a front-back staggered mode; 2) starting the polishing machine, spraying polishing liquid, and rotatably descending the polishing wheel until the bottom surface of the wheel body is flush with the bottom surface of the concave surface of the product; 3) the polishing wheel moves forwards along the length direction of the product, meanwhile, pressure is applied to the bottom surface of the concave surface of the product and one of the arc-shaped side surfaces, after a set distance is reached, the polishing wheel returns along the original path and applies pressure to the other arc-shaped side surface, and the process is repeated until the processing time is finished; 4) and lifting the polishing wheel to a safe height after the polishing wheel is horizontally separated from the product, and taking out the processed product. The invention can realize the dead-angle-free polishing of the inner buckle area of the product, reduce the bad performance and simplify the processing technology.
Description
Technical Field
The invention relates to the technical field of polishing, in particular to a method for polishing an inner concave surface of a reverse-buckled product.
Background
Because the front cover glass of the mobile phone is the window glass, if bad mold prints, orange marks, indentations and the like occur, the bad mold prints, orange marks, indentations and the like can be directly fed back to the whole mobile phone, and the use experience is influenced, so that consumers put forward high-quality requirements on the appearance of the front cover glass of the mobile phone. The existing mobile phone front cover glass is of an inverted buckle structure and comprises a large plane and arc-shaped side edges symmetrically arranged on the left side and the right side of the large plane, and the curvature of the tail ends of the arc-shaped side edges relative to the large plane exceeds 90 degrees.
Referring to fig. 1, the original processing procedure of the above-mentioned inverted product is as follows: 1) primary hot bending: the left side edge and the right side edge of the plate are slightly bent into an arc shape through hot bending, and the bending degree of the tail end of the arc side edge relative to a large plane is smaller than 90 degrees at the moment; 2) primary polishing: polishing the inner concave surface of the product by adopting a square hole machine and a mixed brush; 3) secondary hot bending: further bending the arc-shaped side edges at the left side and the right side of the plate inwards through hot bending until the bending degree of the tail ends of the arc-shaped side edges relative to the large plane exceeds 90 degrees; 4) and (3) secondary polishing: and polishing the inner concave surface of the product by adopting a square hole machine and a mixed hairbrush.
Referring to fig. 2, since the areas deformed in the two hot bending processes are overlapped, even if the overlapped area is removed from the defect in the first polishing operation, a new defect is generated due to the second hot bending operation, and since the product adopts the step hot bending, the end of the primary hot bending forming area becomes the inner buckling position in the second hot bending process, and the conventional polishing wheel adopts the standard R angle, the polishing at the position is limited, and becomes a polishing blind area.
In addition, due to the adoption of a processing method of polishing twice, the surface shape of the inner buckle area of the product is obviously different after the polishing operation twice, the thickness has errors, and the anti-falling property and the inner side strength of the side position are weakened. Meanwhile, the provision of two polishing processes may increase production costs and decrease production efficiency.
Disclosure of Invention
The invention aims to provide a polishing method which can finish polishing of an inner concave surface of a reverse-buckled product at one time and has no dead angle.
In order to achieve the purpose, the invention provides a polishing method of an inner concave surface of a reverse-buckled product, which comprises the steps of polishing by adopting a polishing wheel which is designed to be in a shape similar to the inner concave surface of the product, wherein a wheel body of the polishing wheel is of a disc structure with an arc-shaped side surface, and the bottom surface and the arc-shaped side surface of the wheel body are respectively matched with the bottom surface and the arc-shaped side surface of the inner concave surface of the product in shape and size; the polishing method comprises the following steps:
step 1) placing a product subjected to one-time hot bending forming in a product cavity of a polishing machine, enabling the concave surface of the product to face upwards, and arranging a polishing wheel and the product below the polishing wheel in a front-back staggered mode;
step 2), starting the polishing machine, spraying polishing liquid, and rotatably descending the polishing wheel until the bottom surface of the wheel body is flush with the bottom surface of the concave surface of the product;
step 3) the polishing wheel moves forwards along the length direction of the product (namely the length direction of the arc-shaped side edge), pressure is applied to the bottom surface of the concave surface and one of the arc-shaped side surfaces of the product at the same time, after the preset distance is reached, the polishing wheel returns along the original path and applies pressure to the other arc-shaped side surface, and the process is repeated until the processing time is finished;
and 4) lifting the polishing wheel to a safe height after the polishing wheel is horizontally separated from the product, and taking out the processed product.
Preferably, in the step 3), the polishing wheel operation includes a forward rotation stage and a reverse rotation stage.
Preferably, the machining time of the polishing wheel in the forward rotation stage is equal to the machining time in the reverse rotation stage.
Preferably, the polishing wheel is pressure compensated to the bottom surface and curved side surfaces of the concave surface in the product each time it is activated.
Preferably, the feed amount of the polishing wheel downward at the next start is offset by 0.01mm and the feed amount in the direction corresponding to the arc-shaped side surface to which the pressure is applied is offset by 0.001mm compared to the previous polishing work.
Preferably, the speed of the polishing wheel when the middle section of the product is processed is greater than the speed of the polishing wheel when the two ends of the product are processed.
The speed refers to the speed of the polishing wheel running along the length direction of the product, the slower the speed, the higher the polishing efficiency of the corresponding area, and conversely, the faster the speed, the lower the polishing efficiency of the corresponding area. Because the die is mainly stressed on four corners of the product when the inverted product is molded, the orange grains in the two end regions of the product are heavier while the orange grains in the middle region of the product are lighter, and in order to take polishing efficiency and the whole polishing effect into consideration, the running speed of the polishing wheel is changed.
Preferably, the polishing wheel comprises a polishing medium contacting with the concave surface of the product and a substrate for supporting the polishing medium, the polishing medium is formed by combining an elastic polyurethane material and a cerium oxide component, and the substrate is made of POM white plastic steel or an injection molding material.
Preferably, the polishing solution contains 0.5-0.8 μm cerium oxide, and the concentration of the polishing solution is 1.18-1.25 g/mL.
Preferably, the product is fixedly arranged in the product cavity in a vacuum adsorption mode.
Preferably, the polishing machine is a multi-shaft polishing machine, the upper part of the multi-shaft polishing machine is provided with a plurality of polishing wheels capable of independently controlling forward and reverse rotation and forward and backward movement, the lower part of the multi-shaft polishing machine is provided with a platform, and the platform is provided with a plurality of product cavities for fixing the positions of products.
The technical scheme provided by the invention at least has the following beneficial effects:
the invention optimizes the traditional polishing method, aims at the inverted product formed by one-time hot bending, realizes the covering type omnibearing finish polishing of the inner concave surface of the inverted product by adopting the polishing wheel provided with the non-standard annular R angle matched with the shape of the inner concave surface of the product and the processing path of back-and-forth movement plus left-and-right pressure application, effectively removes the defects of mold marks, orange marks, indentation and the like in the hot bending process of the product, meets the requirements of mass production process, also realizes the simplification of the traditional processing process by matching with a new hot bending mold, simplifies the original procedures of twice hot bending and twice polishing into one time hot bending and one time polishing, avoids the generation of polishing blind area and new defects, meanwhile, the product circulation time is shortened, the production efficiency is improved, the production cost is reduced, and the method is simple to operate, easy to popularize and apply and high in practical value.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings described below are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic view of a prior art process for double hot-bending a molded product;
FIG. 2 is an enlarged view of the structure of FIG. 1 at the location of the hot bends;
FIG. 3 is a schematic view showing the processing of a one-time hot-roll formed product according to the present invention;
FIG. 4 is a schematic view of the polishing wheel of the present invention during processing;
FIG. 5 is a schematic view of the construction of the polishing wheel of the present invention;
FIG. 6 is a schematic diagram of the construction of the polishing medium of FIG. 5;
wherein: product 01, polishing wheel 1, substrate 2, polishing medium 3.
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Example 1
The polishing method is used for processing the surface of a reversed product formed by one-time hot bending, the hot bending process is realized by matching with a new mold, and the structure of the new mold and the hot bending process of the product are shown in figure 3.
In the embodiment, the obtained hot-bent product 01 has the specification of 150mm in length, 70mm in width and 10mm in thickness, and comprises a large plane and arc-shaped side edges symmetrically arranged at the left side and the right side of the large plane, wherein the curvature of the tail ends of the arc-shaped side edges relative to the large plane exceeds 90 degrees.
Referring to fig. 4-6, when the product is polished, a polishing wheel which is designed to be in a shape of a concave surface in the product is adopted. In the polishing process, the X axis represents the left-right moving direction of the polishing wheel, the Y axis represents the front-back moving direction of the polishing wheel, and the Z axis represents the up-down moving direction of the polishing wheel.
In this embodiment, the polishing machine is a twelve-axis polishing machine, twelve polishing wheels capable of independently controlling forward and reverse rotation and forward and backward movement are arranged at the upper part of the polishing machine, and twelve product clamps for fixing the positions of products are arranged on a base platform of the polishing machine, so that the polishing of the inner concave surfaces of 12 inverted products can be realized at one time.
The product anchor clamps include outer loop, basic body and backing plate, the outer loop adopts wear-resisting material to make, and the overall dimension of the size ratio back-off product that the outer loop encloses into the die cavity is big 0.2mm, the basic body is located the product anchor clamps bottom for support the interior concave surface of back-off product and can be according to the shaping of product shape and size bending, and in fact, the basic body is the nonstandard R value of product 3D convex surface cambered surface, the setting of backing plate is on the basic body and specifically is the black soft coarse cotton cloth of 0.5mm thickness.
The base platform is synthesized by about 70 percent of polyhexamethylene diamine 66 with stronger uniformity and about 30 percent of glass fiber, is firm and wear-resistant at high temperature, can protect a polished piece and provide a clean polishing environment, is favorable for improving the polishing efficiency of a three-dimensional polished piece and reduces the damage to the polished piece.
The polishing wheel 1 is characterized in that the wheel body is of a disc structure with an arc-shaped side surface, the diameter of the wheel body is 70mm, and the bottom surface and the arc-shaped side surface of the wheel body are respectively matched with the bottom surface and the arc-shaped side surface of the concave surface of the product in shape and size. The polishing wheel 1 comprises a substrate 2 and a polishing medium 3, wherein the substrate 2 is made of POM white plastic steel or injection molding material and is used as a structural component for connecting a machine table and supporting the polishing medium, and the polishing medium 3 is formed by combining elastic polyurethane material and cerium oxide, so that the high-speed polishing of the surface of a product can be completed, and the standard smoothness requirement can be met. The cerium oxide has a good polishing effect, the polyurethane is tightly attached to the inner concave surface of the product by means of the elasticity of the polyurethane, the peripheral circular rings are in contact polishing with the inner concave arc-shaped side surface, the bottom plane is in contact polishing with the inner concave plane, and no polishing dead angle is guaranteed.
The base body 2 and the polishing medium 3 are mixed and connected into a concentric circle type for fixation, the size of the base body 2 is in interference fit with the position of a groove of polyurethane, a round cake part of the base body 2 is bonded with the polyurethane, and a round rod part of the base body 2 is fixedly connected with a Z-axis connecting port of a polishing machine table.
The polishing method comprises the following steps:
step 1) manufacturing a polishing wheel and a product clamp according to the specification of a product, respectively and correspondingly installing the polishing wheel and the product clamp on a Z shaft and a base platform of a twelve-shaft polishing machine, adjusting twelve polishing wheels to be at the same level and twelve product clamps to be at the same level, and adjusting the concentration of polishing solution, wherein each milliliter of the polishing solution contains 1.18g of cerium oxide with the particle size of 0.5-0.8 mu m.
Step 2), setting processing parameters: the total processing time is 2000s, wherein the forward rotation is that the clockwise rotation is 1000s, and the reverse rotation is that the anticlockwise rotation is 1000 s; the wheel body rotating speed of the polishing wheel is 1500 r/min; taking the central point of the product as an original point, and setting the maximum forward or backward movement distance of the polishing wheel to be 150/2+70/2 mm as 110mm when the polishing wheel reciprocates; fourthly, when the polishing wheel starts new polishing operation each time, the polishing wheel automatically compensates for 0.01mm towards the bottom surface compared with the previous polishing operation, and automatically compensates for 0.001mm towards the left side or the right side of the arc-shaped side surface; the product is divided into three sections of polishing operation areas along the length direction, and the speed of the polishing wheel in the middle section of the operation area is three times that of the front section of the operation area and the rear section of the operation area.
And 3) placing the product subjected to one-time hot bending molding in a cavity of the product clamp, enabling the concave surface of the product to face upwards, starting vacuum adsorption and fixing, and arranging the polishing wheel and the product below the polishing wheel in a staggered manner.
Step 4), starting the equipment to enter an automatic processing mode, spraying polishing liquid, and rotating and descending the polishing wheel until the bottom surface of the wheel body is flush with the bottom surface of the concave surface of the product;
the polishing wheel rotates forwards at a high speed and moves backwards along the Y axis, meanwhile, set pressure is applied downwards and to the left side of the X axis, the polishing wheel moves to the rear for a set distance along the Y axis and then returns along the original path, at the moment, the polishing wheel applies the set pressure to the right side of the X axis instead, the polishing wheel moves to the front for a set distance along the Y axis, the process is repeated, and the polishing wheel reciprocates along the length direction of a product until the 1000s of forward processing is finished;
and the rotation mode of the polishing wheel is switched to reverse rotation, the moving path is continuously repeated until the 1000s of reverse processing is finished, and the forward and reverse polishing operation of the concave surface of the product is finished.
Step 5), horizontally moving the polishing wheel until the polishing wheel is completely separated from the product, then lifting to a safe height, closing vacuum, taking out the processed product, cleaning, inspecting, then entering a subsequent process, and repeating the step 3) and the step 4), so that the integral polishing of the concave surfaces of the batch of products can be completed;
compared with the previous polishing operation, the downward feeding amount of the polishing wheel is compensated by 0.01mm when the polishing wheel is started next time, and the feeding amount of the polishing wheel in the direction corresponding to the arc-shaped side face applying the pressure is compensated by 0.001 mm.
A batch of inverted products are processed according to the embodiment, the inspection yield reaches 90%, the integral removal amount of the products is 0.03mm, the roughness of the bottom surface of the concave surface is below 0.005mm, and the roughness of the arc-shaped side surface of the concave surface is below 0.015mm, so that the finish requirement of the products is completely met.
Compared with the traditional polishing technology, the polishing method in the embodiment is matched with a new hot bending processing die, the purpose of process simplification is achieved, the hot bending times and the polishing times are reduced, in addition, a multi-shaft polishing machine is adopted, multiple products can be processed at one time, and the operation efficiency is improved; meanwhile, the polishing wheel adopts a non-standard annular R angle matched with the shape of the concave surface of the product, a polishing medium of elastic polyurethane and cerium oxide and a polishing path in the front-back direction (along the arc side direction of the product), so that all regions of inner buckle, back-off and plane can be polished at one time, and the polishing is guaranteed to be in place.
This embodiment is still through setting up pressure compensation, ensures not to appear because of the wearing and tearing of polishing wheel bottom and outer ring peripheral position that the concave surface of product does not grind and then does not reach the condition of printing opacity bright effect.
In addition, the polishing wheel rotates forwards to ensure the abrasion of the R angle of the polishing wheel during product processing, and the reverse rotation can effectively compensate the removal amount of the R angle polishing wheel, so that the concave surface roughness is reduced, and the finer finish is achieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and various modifications and changes may be made by those skilled in the art. Any improvement or equivalent replacement directly or indirectly applied to other related technical fields within the spirit and principle of the invention and the contents of the specification and the drawings of the invention shall be included in the protection scope of the invention.
Claims (10)
1. A polishing method for an inner concave surface of a reversed product is characterized in that a polishing wheel which is designed to be in a shape similar to the inner concave surface of the product is adopted for polishing, a wheel body of the polishing wheel is of a disc structure with an arc-shaped side surface, and the bottom surface and the arc-shaped side surface of the wheel body are respectively matched with the bottom surface and the arc-shaped side surface of the inner concave surface of the product in shape and size; the polishing method comprises the following steps:
step 1) placing a product subjected to one-time hot bending forming in a product cavity of a polishing machine, enabling the concave surface of the product to face upwards, and arranging a polishing wheel and the product below the polishing wheel in a front-back staggered mode;
step 2), starting the polishing machine, spraying polishing liquid, and rotatably descending the polishing wheel until the bottom surface of the wheel body is flush with the bottom surface of the concave surface of the product;
step 3) the polishing wheel moves forwards along the length direction of the product, pressure is applied to the bottom surface of the concave surface of the product and one of the arc-shaped side surfaces at the same time, after the preset distance is reached, the polishing wheel returns along the original path and applies pressure to the other arc-shaped side surface, and the process is repeated until the processing time is finished;
and 4) lifting the polishing wheel to a safe height after the polishing wheel is horizontally separated from the product, and taking out the processed product.
2. The method of polishing the inner concave surface of a reverse fastened product according to claim 1, wherein in step 3), the polishing wheel operation includes a forward rotation stage and a reverse rotation stage.
3. The method of claim 2, wherein the polishing wheel is rotated in a forward direction for a time period equal to a time period of the reverse rotation for a time period equal to the time period of the forward rotation.
4. The method of claim 2 wherein the polishing wheel is activated each time pressure compensation is applied to the bottom and curved sides of the concave surface of the product.
5. The method of claim 4, wherein the downward feed of the polishing wheel at the next start is offset by 0.01mm and the feed in the direction corresponding to the curved side to which the pressure is applied is offset by 0.001mm compared to the previous polishing operation.
6. The method of claim 4, wherein the polishing wheel is configured to process the middle section of the product at a speed greater than the speed of the two ends of the product.
7. The method for polishing the concave surface of the inverted product according to any one of claims 1 to 6, wherein the polishing wheel comprises a polishing medium in contact with the concave surface of the product and a substrate for supporting the polishing medium, the polishing medium is made of elastic polyurethane material and cerium oxide, and the substrate is made of POM white plastic steel or injection molding material.
8. The method of claim 7, wherein the polishing liquid contains 0.5 to 0.8 μm cerium oxide, and the concentration of the polishing liquid is 1.18 to 1.25 g/mL.
9. The method of claim 7, wherein the product is fixedly disposed in the product cavity by vacuum suction.
10. The method of claim 7, wherein the polishing machine is a multi-spindle polishing machine, a plurality of polishing wheels capable of independently controlling forward and backward movements are disposed on an upper portion of the multi-spindle polishing machine, a platform is disposed on a lower portion of the multi-spindle polishing machine, and a plurality of product cavities for fixing positions of products are disposed on the platform.
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| CN202011480843.8A CN112643516B (en) | 2020-12-15 | 2020-12-15 | Polishing method for concave surface of inverted product |
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| CN202011480843.8A CN112643516B (en) | 2020-12-15 | 2020-12-15 | Polishing method for concave surface of inverted product |
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| CN112643516B CN112643516B (en) | 2022-12-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114799382A (en) * | 2022-03-30 | 2022-07-29 | 沈阳理工大学 | Transmission type profiling electrolytic machining device for inner concave surface of metal cylinder part |
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| CN114799382A (en) * | 2022-03-30 | 2022-07-29 | 沈阳理工大学 | Transmission type profiling electrolytic machining device for inner concave surface of metal cylinder part |
| CN114799382B (en) * | 2022-03-30 | 2023-06-16 | 沈阳理工大学 | Concave surface device in transmission type profile modeling electrolytic machining metal cylinder class part |
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| CN112643516B (en) | 2022-12-02 |
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