Process for removing burrs from the surface of a workpiece of polymeric material

Abstract

The application relates to the technical field of surface treatment, in particular to a process for removing burrs on the surface of a high polymer material workpiece, which comprises the following steps: providing a water jet spraying device comprising a spray gun; fixing the high polymer material workpiece on a jig of the water jet spraying device; controlling the spray gun to spray a mixed solution at a preset flow rate, a preset pressure and a preset spraying distance to treat the surface of the high polymer material workpiece; wherein the high polymer material workpiece is a polyether ether ketone workpiece or an acrylonitrile-butadiene-styrene copolymer workpiece; the mixed solution comprises abrasive and water, the abrasive comprises wood chips, the mass percentage of the wood chips in the mixed solution is 8%-15%, and the density of the wood chips is 0.3 g / cm 3 0.6 g / cm 3 The application adds wood chips as abrasive in the abrasive water jet process, which can not only remove hidden burrs on the high polymer material workpiece, but also avoid thermal deformation of the high polymer material workpiece caused by friction heat generated by the abrasive water jet.

Description

Technical Field

[0001] This application relates to the field of surface treatment technology, and in particular to a process for removing burrs from the surface of polymer material workpieces. Background Technology

[0002] Polymer materials possess excellent properties, have wide applications, and a broad market prospect. However, during the processing of polymer materials, burrs and scratches are easily generated on the surface, which not only affect the appearance of the product but also its assembly accuracy and pose safety hazards. Currently, abrasive waterjet is commonly used to remove surface burrs from polymer materials. To ensure effective burr removal, the abrasive waterjet process typically requires a long time. However, under high-pressure scouring, the polymer material generates frictional heat due to the impact, leading to thermal deformation.

[0003] Therefore, it is urgent to solve the problem of frictional heat generated during abrasive waterjet processing, which leads to thermal deformation of polymer materials. Summary of the Invention

[0004] Based on the shortcomings of existing technologies, this application provides a process for removing burrs from the surface of polymer material workpieces, aiming to solve the problem of thermal deformation of polymer materials caused by frictional heat generated during abrasive water jetting.

[0005] To achieve the above objectives, this application provides the following technical solution: A process for removing burrs from the surface of a polymer material workpiece, the process comprising the following steps: Provide water jet spraying equipment including spray guns; The polymer material workpiece is fixed in the fixture of the water jet spraying equipment, and the spray gun is controlled to spray a mixture to treat the surface of the polymer material workpiece according to the preset flow rate, preset pressure and preset spray distance. The polymer material workpiece is a polyetheretherketone workpiece or an acrylonitrile-butadiene-styrene copolymer workpiece; The mixture contains abrasive and water, the abrasive comprising sawdust, the sawdust comprising 8% to 15% of the mixture by mass, and the sawdust having a density of 0.3 g / cm³. 3 ~0.6g / cm 3 .

[0006] In some embodiments, the water absorption rate of the wood chips is 50% to 80%.

[0007] In some embodiments, before performing the step of treating the surface of the polymer material workpiece with the sprayed mixture, the method includes: transporting the abrasive and the water to the mixing chamber of the water jet spraying device at the preset flow rate and mixing them to obtain the mixture; the preset flow rate includes the water flow rate and the abrasive flow rate.

[0008] In some embodiments, the polymer material workpiece is a polyetheretherketone workpiece, and the mixture contains, by weight percentage: 8%~15% sawdust, 15%~25% nylon sand, 8%~12% talc, and the balance being water.

[0009] In some embodiments, the polymer material workpiece is a polyetheretherketone (PEEK) workpiece, and the volumetric particle size Dv50 of the nylon sand is 0.2 mm to 1.0 mm.

[0010] In some embodiments, the polymer material workpiece is a polyetheretherketone workpiece, and the water flow rate is 0.2 L / min to 5 L / min; And / or, the abrasive flow rate is 0.1 kg / min to 1.2 kg / min; And / or, the preset pressure is 2MPa~20MPa.

[0011] In some embodiments, the polymer material workpiece is an acrylonitrile-butadiene-styrene copolymer workpiece, and the mixture contains, by weight percentage: 8%~15% sawdust, 12%~18% corundum, and the balance being water.

[0012] In some embodiments, the polymer material workpiece is an acrylonitrile-butadiene-styrene copolymer workpiece, and the density of the corundum is 3.5~4.0 g / cm³. 3 .

[0013] In some embodiments, the polymer material workpiece is an acrylonitrile-butadiene-styrene copolymer workpiece, and the water flow rate is 0.2L / min to 3L / min; And / or, the abrasive flow rate is 0.2 kg / min to 0.8 kg / min; And / or, the preset pressure is 1MPa~10MPa.

[0014] In some embodiments, the preset spray distance is 7mm to 50mm.

[0015] The beneficial effects of this application are as follows: This application utilizes preset flow rate, preset pressure, and preset spray distance to generate a high-speed sprayed mixture via a spray gun. This mixture rapidly washes over the surface of a polymer material workpiece to remove burrs. By adding sawdust of a certain density and content to the mixture, when it impacts the polymer material workpiece, the sawdust not only absorbs water and forms a gel layer covering the workpiece, mitigating the impact force and frictional heat, effectively reducing the risk of thermal deformation and impact damage, but also adsorbs impurities generated during burr removal to prevent scratches and microburrs. Furthermore, the sawdust helps remove hidden burrs in complex polymer material workpieces such as deep holes and intersecting holes, and polishes the surface, thereby reducing the surface roughness of the polymer material workpiece. Attached Figure Description

[0016] Figure 1 This is a rendering of the polyetheretherketone workpiece before deburring in Example 1 of this application; Figure 2 This is a diagram showing the effect of deburring the polyetheretherketone workpiece in Example 1 of this application; Figure 3 This is a rendering of the acrylonitrile-butadiene-styrene copolymer workpiece before deburring in Example 4 of this application; Figure 4 This is a diagram showing the effect of deburring the acrylonitrile-butadiene-styrene copolymer workpiece of Example 4 of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. It should be understood that the following embodiments are merely used to explain this application and are not intended to limit this application. Unless otherwise specified, all technical and scientific terms used herein have their ordinary meaning in the field to which the claimed subject matter belongs.

[0018] Polymer materials possess excellent properties, have wide applications, and a broad market prospect. However, during the processing of polymer materials, burrs and scratches are easily generated on the surface, which not only affect the appearance of the product but also affect its assembly accuracy and create potential safety hazards. Currently, abrasive waterjet is commonly used to remove surface burrs from polymer materials; however, to ensure effective burr removal, the abrasive waterjet process requires a relatively long time. Under high-pressure scouring, the polymer material generates frictional heat due to the impact, leading to thermal deformation.

[0019] Therefore, it is urgent to solve the problem of frictional heat generated during abrasive waterjet processing, which leads to thermal deformation of polymer materials.

[0020] Based on the shortcomings of existing technologies, this application provides a process for removing burrs from the surface of polymer material workpieces, aiming to solve the problem of thermal deformation of polymer materials caused by frictional heat generated during abrasive water jetting.

[0021] To achieve the above objectives, this application provides the following technical solution: A process for removing burrs from the surface of polymer material workpieces, the process comprising the following steps: Provide water jet spraying equipment including spray guns; The polymer material workpiece is fixed in the fixture of the water jet spraying equipment, and the spray gun is controlled to spray the mixed liquid to treat the surface of the polymer material workpiece according to the preset flow rate, preset pressure and preset spray distance. Among them, the polymer material workpieces are polyetheretherketone workpieces or acrylonitrile-butadiene-styrene copolymer workpieces; The mixture contains abrasive and water. The abrasive consists of sawdust, which accounts for 8%–15% of the mixture by mass, and has a density of 0.3 g / cm³. 3 ~0.6g / cm 3 .

[0022] The water jet spraying equipment provided in this solution has multiple workstations equipped with fixtures, which are used to fix and mount the polymer material workpieces to be processed. The water jet spraying equipment also includes a spray gun and a mixing chamber, with the mixing chamber connected to the liquid inlet of the spray gun. After fixing the polymer material workpiece in the fixture and adjusting the mixed liquid and preset parameters such as preset flow rate, preset pressure, and preset spray distance, the mixed liquid is prepared in the mixing chamber. Then, the mixed liquid enters the spray gun through the liquid inlet and is sprayed out through the nozzle of the spray gun, causing the mixed liquid to wash the surface of the polymer material workpiece at high speed, effectively removing its burrs.

[0023] In this embodiment, the density and content of sawdust in the mixture can be adjusted. Combined with the cellulose structure of the sawdust, it achieves a suitable volume after water absorption, forming a gel layer that covers the polymer workpiece. This buffers the impact of the mixture and hinders the transfer of frictional heat between the mixture and the polymer workpiece, reducing the risk of thermal deformation and damage caused by frictional heat and excessive impact. Simultaneously, the sawdust absorbs dust generated during burr removal, reducing the risk of scratches and microburrs on the polymer workpiece. Furthermore, the porous structure of the sawdust not only helps remove hidden burrs in complex polymer workpieces with deep holes and intersecting holes but also facilitates polishing the surface, thereby reducing surface roughness. Further, the lignin in the sawdust acts as a natural lubricant, reducing the flow resistance of the mixture in pipes and nozzles, effectively extending the nozzle's lifespan.

[0024] In some embodiments, the sawdust accounts for 15% of the mass percentage of the mixture, and the density of the sawdust is 0.3 g / cm³. 3 When applied to polymeric material workpieces that are prone to heat deformation or have low hardness, such as those with a heat deformation temperature of 70-90℃ or a Shore hardness of 60-70HD, increasing the sawdust content in the mixture while reducing the sawdust density will improve its water absorption efficiency. This results in sawdust with a relatively large volume after absorbing water, which enhances the buffering effect against the impact of the mixture during deburring and improves the insulation effect of frictional heat on the surface of the polymeric material workpiece, effectively reducing damage and heat deformation of the polymeric material workpiece.

[0025] In some embodiments, the sawdust accounts for 8% of the mass percentage of the mixture, and the density of the sawdust is 0.6 g / cm³. 3 When polymer material workpieces are relatively resistant to thermal deformation or have high hardness, such as a heat deformation temperature of 160~170℃ or a Shore hardness of 110~120HD, appropriately reducing the content of sawdust and increasing its density to achieve suitable water absorption efficiency and appropriate volume after water absorption can not only maintain the mitigation effect against impact and frictional heat, reducing the risk of damage and thermal deformation to the polymer material workpieces, but also increase the content of other components in the mixture, which helps to improve the cutting force on burrs, effectively improve burr removal efficiency, and reduce the number of residual burrs.

[0026] In some embodiments, the water absorption rate of the wood chips is 50% to 80%.

[0027] When the mixed liquid impacts the polymer material workpiece, the wood chips that have absorbed water will form a gel layer covering the workpiece. Setting the water absorption rate of the wood chips within this range can adjust the volume of the wood chips after absorbing water. While alleviating the impact force and frictional heat brought by the mixed liquid, it will not hinder the impact of the mixed liquid on the surface of the polymer material workpiece, thus avoiding burr residue and helping to improve the burr removal effect. It can also prevent the wood chips from being crushed due to excessive water absorption, which would affect its polishing effect.

[0028] In some embodiments, the water absorption rate of the wood chips is 50%. When applied to some polymeric materials with high hardness or relatively low susceptibility to heat deformation, such as those with a Shore hardness of 110~120HD or a heat distortion temperature of 160~170℃, reducing the water absorption rate of the wood chips, based on the mixture and the content and density of the wood chips, will reduce the volume of the wood chips after absorbing water. This will alleviate the impact force and frictional heat brought by the mixture, while increasing the cutting force of the mixture on burrs, effectively improving the burr removal efficiency and reducing the number of residual burrs.

[0029] In some embodiments, the water absorption rate of the wood chips is 80%. When the hardness of the polymer material is low or it is prone to thermal deformation, for example, when the Shore hardness is 60~70HD or the heat distortion temperature is 70~90℃, increasing the water absorption rate of the wood chips, along with their content and density, will increase their volume after water absorption. This can enhance the buffering effect against impact and the isolation effect against frictional heat, effectively reducing damage and thermal deformation of polymer material workpieces.

[0030] In some embodiments, before performing the step of spraying the mixture to treat the surface of the polymer material workpiece, the method includes: transporting abrasive and water to the mixing chamber of a water jet spraying device at a preset flow rate to mix them to obtain a mixture; the preset flow rate includes the water flow rate and the abrasive flow rate.

[0031] Before processing polymer material workpieces, mixing abrasive and water ensures that all components in the mixture are evenly mixed. This facilitates uniform processing of the polymer material workpieces and avoids uneven impact forces caused by uneven mixture, which can lead to excessive local roughness. At the same time, it allows the sawdust to absorb water and expand first, which helps to mitigate the impact force and frictional heat from the mixture during subsequent processing of the polymer material workpieces, reducing the risk of impact damage and thermal deformation.

[0032] In some embodiments, the polymer material workpiece is a polyetheretherketone workpiece, and the mixture contains, by weight percentage: 8%~15% sawdust, 15%~25% nylon sand, 8%~12% talc, and the balance is water.

[0033] During the deburring process of polyetheretherketone (PEEK) workpieces, the wood chips have a low impact velocity and can form a soft impact layer after mixing with water. This not only reduces the impact force of the mixture on the PEEK workpieces but also hinders frictional heat transfer, effectively reducing the risk of impact damage and thermal deformation of the PEEK workpieces. At the same time, the wood chips can adsorb the detached PEEK workpiece debris and microburrs, preventing them from being washed back to the PEEK workpiece surface by the water flow and causing secondary pollution that would create new scratches and microburrs. Furthermore, the flaky structure of the wood chips will produce a rolling polishing effect on the PEEK workpiece surface, which is beneficial to reducing its surface roughness.

[0034] In some embodiments, the density of the wood chips is 0.45 g / cm³. 3 ~0.60g / cm 3 By adjusting the density of the wood chips within this range based on the composition of the mixture, its volume can be adjusted, which helps to buffer the impact force brought by the mixture and hinder frictional heat transfer, thereby reducing the risk of damage and thermal deformation of polyetheretherketone (PEEK) workpieces.

[0035] The main component of nylon abrasive is polyamide fiber. When it impacts a polyetheretherketone (PEEK) workpiece, it undergoes elastic deformation and absorbs the kinetic energy of the mixture. This reduces the risk of scratches and microcracks on the surface of the PEEK workpiece due to impact. At the same time, nylon abrasive can roll and rub against the surface of the PEEK workpiece, smoothing the root of the burr into an arc shape, effectively removing burrs and reducing the surface roughness of the PEEK workpiece.

[0036] In some embodiments, the volumetric particle size Dv50 of the nylon sand is 0.2 mm to 1.0 mm.

[0037] Adjusting the average particle size of the nylon abrasive within this range can regulate its elastic deformation ability to promote its absorption of the kinetic energy of the mixture, which helps to alleviate the impact of the mixture on the polyetheretherketone workpiece. Furthermore, smaller nylon abrasive particles are beneficial for rolling friction on the surface of the polyetheretherketone workpiece, which can not only remove burrs but also polish the polyetheretherketone workpiece.

[0038] In some embodiments, the volumetric particle size Dv50 of the nylon abrasive is 0.2 mm. When there is a high requirement for the surface roughness of the polyetheretherketone (PEEK) workpiece, reducing the volumetric particle size Dv50 of the nylon abrasive, in conjunction with the wood chips and the remaining components of the mixture, helps to polish the surface of the PEEK workpiece, improves the burr removal effect, and reduces the surface roughness of the PEEK workpiece.

[0039] In some embodiments, the volumetric particle size Dv50 of the nylon abrasive is 1.0 mm. Increasing the volumetric particle size Dv50 of the nylon abrasive can improve its elastic deformation capacity. Together with the mixed liquid components such as wood chips, it helps to buffer the impact force of the mixed liquid. In addition, in conjunction with the mixed liquid components, it can increase the impact force on the polyetheretherketone (PEEK) workpiece, thereby reducing the impact force on the PEEK workpiece to reduce crack formation while improving deburring efficiency.

[0040] The layered crystalline structure of talc gives it a certain degree of lubrication. When the mixture washes onto the surface of the polyetheretherketone (PEEK) workpiece, the talc forms a soft barrier, working in conjunction with the wood chips to mitigate the direct impact of the mixture on the PEEK workpiece. This reduces the formation of microcracks in the PEEK workpiece. Furthermore, talc can fill the microcracks generated under high-pressure impact, blocking the propagation path of the microcracks and helping to improve the durability of the PEEK workpiece.

[0041] Polyetheretherketone (PEEK) workpieces have relatively low glass transition temperatures and heat distortion temperatures. Their heat distortion temperature is 150℃~170℃, and their glass transition temperature is 143~145℃. During deburring, frictional heat generated with the mixture can lead to localized glass transition and other heat distortion defects. This solution adjusts the composition of the mixture to these ranges. Simultaneously with deburring, the synergistic effect of sawdust, nylon sand, talcum powder, and water not only mitigates the impact and frictional heat from the mixture but also removes impurities generated during the process to prevent scratches and microburrs on the PEEK workpiece surface. This effectively reduces the risk of damage and heat distortion to the PEEK workpiece and also polishes the surface, effectively reducing its surface roughness.

[0042] In some embodiments, the mixture comprises: 8% sawdust, 15% nylon sand, 8% talc, and the balance being water. When the polyetheretherketone (PEEK) workpiece has few burrs or a low heat distortion temperature, such as 150-155°C, appropriately reducing the abrasive content of the mixture can, while removing burrs, also mitigate direct impact on the PEEK workpiece through the synergistic effect of the mixture components, avoiding excessive impact that could cause cracks and dents, and preventing thermal deformation of the PEEK workpiece due to frictional heat.

[0043] In some embodiments, the mixture comprises: 15% sawdust, 25% nylon sand, 12% talc, and the balance being water. When the polyetheretherketone (PEEK) workpiece has many burrs or a high heat distortion temperature, such as 165-170°C, appropriately increasing the abrasive content of the mixture can not only increase the cutting force on the burrs but also improve the rolling polishing effect on the PEEK workpiece. Furthermore, increasing the amount of talc and sawdust can increase the adsorption force on impurities to avoid scratching the surface, and also helps remove hidden burrs, improving deburring efficiency and reducing the surface roughness of the PEEK workpiece.

[0044] In some embodiments, the polymer material workpiece is a polyetheretherketone workpiece, and the water flow rate is 0.2 L / min to 5 L / min; And / or, the abrasive flow rate is 0.1 kg / min to 1.2 kg / min; And / or, the preset pressure is 2MPa~20MPa.

[0045] Based on the components of the mixture, adjusting the preset flow rate and preset pressure within this range can regulate the impact force on the polyetheretherketone (PEEK) workpiece. While maintaining the impact force on burrs, it can not only avoid damage such as microcracks in the PEEK workpiece caused by excessive impact force, but also reduce the frictional heat between the mixture and the PEEK workpiece, avoiding overheating that could lead to localized thermal deformation of the PEEK workpiece. Furthermore, increasing the preset flow rate and preset pressure within this range can increase the cutting force on burrs, which helps to improve deburring efficiency.

[0046] In some embodiments, the polymer material workpiece is a polyetheretherketone (PEEK) workpiece, the water flow rate is 0.2 L / min, the abrasive flow rate is 0.1 kg / min, and the preset pressure is 2 MPa. When applied to PEEK workpieces with many burrs or high heat distortion temperatures, such as 165~170°C, reducing the preset flow rate and preset pressure of the mixture, although limiting the impact force of the mixture on the PEEK workpiece and resulting in lower deburring efficiency, can reduce the frictional heat between the mixture and the PEEK workpiece, preventing thermal deformation of the PEEK workpiece, and is also beneficial for polishing the PEEK workpiece.

[0047] In some embodiments, the polymer material workpiece is a polyetheretherketone (PEEK) workpiece, the water flow rate is 5 L / min, the abrasive flow rate is 1.2 kg / min, and the preset pressure is 20 MPa. When the PEEK workpiece has few burrs or a low heat distortion temperature, such as 150~155°C, increasing the preset flow rate and preset pressure, along with the composition of the mixture, can improve the impact force on the PEEK workpiece while preventing damage and heat distortion, thereby enhancing deburring efficiency.

[0048] In some embodiments, the polymer material workpiece is an acrylonitrile-butadiene-styrene copolymer workpiece, and the mixture contains, by weight percentage: 8%~15% sawdust, 12%~18% corundum, and the balance being water.

[0049] When the mixed liquid impacts an acrylonitrile-butadiene-styrene copolymer workpiece, the water-absorbing sawdust forms a gel layer on the surface of the workpiece. This gel layer inhibits the transfer of frictional heat generated under high-pressure impact and buffers the impact force of the mixed liquid, effectively reducing impact damage and thermal deformation of the workpiece. At the same time, the sawdust can penetrate the complex structures such as deep holes and intersecting holes in the workpiece, removing hidden burrs and polishing the surface, effectively reducing the surface roughness of the workpiece.

[0050] In some embodiments, the density of the wood chips is 0.30 g / cm³. 3 ~0.40g / cm 3 Based on the composition of the mixture, the density of the wood chips is adjusted within this range. While maintaining the impact force of the mixture to remove burrs, this not only helps to buffer the impact force of the mixture to avoid the formation of microcracks, but also helps to hinder the transfer of frictional heat to avoid thermal deformation of acrylonitrile-butadiene-styrene copolymer workpieces.

[0051] The Mohs hardness of corundum is 8-9. Its sharp particles can effectively remove hard burrs and larger burrs that are tightly bonded to the workpiece matrix. Furthermore, corundum can convert some of the kinetic energy of the high-pressure water flow, thereby optimizing the energy conversion and effectively mitigating the direct impact of the mixture. This makes acrylonitrile-butadiene-styrene copolymer workpieces less prone to deformation and thermal damage due to high-pressure impact.

[0052] In some embodiments, the density of the corundum is 3.5~4.0 g / cm³. 3 Adjusting the density of the corundum within this range controls its kinetic energy, effectively improving the kinetic energy transfer efficiency between the high-pressure water flow and the corundum. This effectively reduces the impact force of the mixture on the acrylonitrile-butadiene-styrene copolymer workpiece, and reduces the risk of deformation and thermal damage to the acrylonitrile-butadiene-styrene copolymer workpiece due to prolonged impact.

[0053] Acrylonitrile-butadiene-styrene copolymer workpieces have low heat distortion temperatures and hardness, with a heat distortion temperature of 70~120℃ and a Shore hardness of 60~120HD. During deburring, they are prone to damage such as pits, cracks, and softening defects due to impact and frictional heat. This solution adjusts the composition of the mixture to the above range. Through the synergistic effect of components such as corundum and sawdust, it effectively buffers the impact force and frictional heat from the mixture while removing burrs, reducing the risk of impact damage and thermal deformation of the acrylonitrile-butadiene-styrene copolymer workpieces.

[0054] In some embodiments, the mixture comprises: 15% sawdust, 12% corundum, and the balance being water. When the hardness or heat distortion temperature of the acrylonitrile-butadiene-styrene copolymer workpiece is low, such as a Shore hardness of 60~75HD or a heat distortion temperature of 70~75°C, appropriately adjusting the abrasive content of the mixture, reducing the corundum content, and increasing the sawdust content can mitigate the direct impact on the acrylonitrile-butadiene-styrene copolymer workpiece during deburring. Although this affects deburring efficiency, it reduces the risk of impact damage and heat deformation, and also improves the polishing effect on the surface of the acrylonitrile-butadiene-styrene copolymer workpiece, which is beneficial for uniformly reducing its surface roughness.

[0055] In some embodiments, the mixture comprises: 8% sawdust, 18% corundum, and the balance being water. When the acrylonitrile-butadiene-styrene copolymer workpiece has a high hardness or heat distortion temperature, such as a Shore hardness of 100~120HD or a heat distortion temperature of 115~120℃, appropriately adjusting the abrasive content of the mixture, while maintaining the sawdust content to mitigate impact and frictional heat, and increasing the corundum content, can improve the cutting force of the mixture on burrs, thus helping to improve deburring efficiency.

[0056] In some embodiments, the polymer material workpiece is an acrylonitrile-butadiene-styrene copolymer workpiece, and the water flow rate is 0.2L / min~3L / min; And / or, the abrasive flow rate is 0.2 kg / min to 0.8 kg / min; And / or, the preset pressure is 1MPa~10MPa.

[0057] By adjusting the preset flow rate and pressure within the above range, the impact frequency on the surface of the acrylonitrile-butadiene-styrene copolymer workpiece can be adjusted based on the mixture, which helps to mitigate impact force and frictional heat, and reduces the risk of damage and thermal deformation to the acrylonitrile-butadiene-styrene copolymer workpiece. Increasing the preset flow rate and pressure within the range increases the impact force of the mixture on the acrylonitrile-butadiene-styrene copolymer workpiece to remove burrs, thus improving deburring efficiency.

[0058] In some embodiments, the polymer material workpiece is an acrylonitrile-butadiene-styrene copolymer workpiece, the water flow rate is 0.2 L / min, the abrasive flow rate is 0.2 kg / min, and the preset pressure is 1 MPa. While reducing the preset flow rate and pressure of the mixture limits the impact force on the acrylonitrile-butadiene-styrene copolymer workpiece and reduces deburring efficiency, it works synergistically with components such as sawdust and corundum to reduce the risk of microcracks caused by excessive impact force, and to reduce the risk of thermal deformation due to frictional heat between the mixture and the acrylonitrile-butadiene-styrene copolymer workpiece. Furthermore, the lower impact force helps polish the acrylonitrile-butadiene-styrene copolymer workpiece, reducing its surface roughness.

[0059] In some embodiments, the polymer material workpiece is an acrylonitrile-butadiene-styrene copolymer workpiece, the water flow rate is 3 L / min, the abrasive flow rate is 0.8 kg / min, and the preset pressure is 10 MPa. When the acrylonitrile-butadiene-styrene copolymer workpiece has many burrs, the synergistic mixture components, while avoiding excessive impact on the surface of the acrylonitrile-butadiene-styrene copolymer workpiece leading to damage and thermal deformation, can increase the preset flow rate and preset pressure, thereby improving the impact force of the mixture and improving the deburring efficiency.

[0060] In some embodiments, the preset spray distance is 7mm to 50mm. Adjusting the preset spray distance to this range effectively controls the impact force of the mixture on the polymer workpiece, reducing the risk of surface defects such as microcracks caused by impact, and also reducing the frictional heat between the mixture and the polymer workpiece, effectively reducing thermal damage to the surface of the polymer workpiece. Increasing the preset spray distance, for example, to 7 to 9mm, based on parameters such as the mixture and preset flow rate, can increase the impact force of the mixture on the surface of the polymer workpiece, improve deburring efficiency, and is suitable for polymer workpiece surfaces with dense burrs and high heat distortion temperatures, such as 150 to 170°C. When the surface of a polymer workpiece has few burrs or low hardness and heat distortion temperature, such as a heat distortion temperature of 70~75℃ and a Shore hardness of 60~75HD, reducing the preset spray distance, such as 47~50mm, may cause the mixture to disperse, resulting in a decrease in impact force and affecting deburring efficiency. However, it can alleviate the direct impact on the surface of the polymer workpiece, effectively reducing impact damage and thermal deformation. At the same time, the lower impact force helps polish the polymer workpiece and achieve the required surface roughness.

[0061] In some embodiments, the polymer material workpiece is a polyetheretherketone (PEEK) workpiece, and the preset spraying distance is 7mm to 50mm. Adjusting the preset spraying distance within this range, based on the properties of the PEEK workpiece and the composition of the mixture, not only meets the deburring requirements but also, in conjunction with other process parameters, controls the impact force and frictional heat generated by the mixture, preventing impact damage and thermal deformation of the PEEK workpiece.

[0062] In some embodiments, the polymer material workpiece is an acrylonitrile-butadiene-styrene copolymer workpiece, and the preset spray distance is 7mm to 22mm. Based on the characteristics of the acrylonitrile-butadiene-styrene copolymer workpiece, and by coordinating other process parameters and mixture composition adjustments, setting the preset spray distance within this range can regulate the impact force of the mixture on the acrylonitrile-butadiene-styrene copolymer workpiece, reducing the risk of impact damage and thermal deformation.

[0063] Based on the required components of the mixture, by comprehensively adjusting parameters such as the preset flow rate, preset pressure, and preset spray distance of the process, the impact force and frictional heat on the surface of polymer material workpieces can be controlled. While improving the burr removal efficiency, it can reduce the risk of impact damage and thermal deformation of polymer material workpieces, and help to steadily reduce the surface roughness of polymer material workpieces.

[0064] Example 1 The mixture comprises, by weight percentage: 10% sawdust, 19.5% nylon sand, 10.5% talc, and the balance being water; wherein the density of the sawdust is 0.6 g / cm³. 3 The water absorption rate is 60%, and the volumetric particle size Dv50 of the nylon sand is 0.5mm.

[0065] Remove surface burrs from polyetheretherketone (PEEK) workpieces: Fix the polyetheretherketone (PEEK) workpiece in the working area; Mix sawdust, nylon sand, talcum powder and water to obtain a mixture; Under the conditions of pressure of 2MPa~20MPa, water flow rate of 0.2L / min~5L / min, abrasive flow rate of 0.1kg / min~1.2kg / min, and spraying distance of 7mm~50mm, a mixture is sprayed from a spray gun to treat polyetheretherketone (PEEK) workpieces, resulting in deburred PEEK workpieces.

[0066] Example 2 The difference between Example 2 and Example 1 is: By weight percentage, the mixture comprises: 8% sawdust, 15% nylon sand, 8% talc, and the balance being water; wherein the density of the sawdust is 0.45 g / cm³. 3 The water absorption rate is 80%, and the volumetric particle size Dv50 of the nylon sand is 1mm. The rest are as described in Example 1.

[0067] Example 3 The difference between Example 3 and Example 1 is: The mixture comprises, by weight percentage: 15% sawdust, 25% nylon sand, 12% talc, and the balance being water; wherein the water absorption rate of the sawdust is 50%, and the volumetric particle size Dv50 of the nylon sand is 0.2 mm. The rest are as described in Example 1.

[0068] Example 4 The mixture, by weight percentage, comprises: 10% sawdust, 15% corundum, and the balance being water. The density of the corundum is 3.9 g / cm³. 3 The density of the sawdust is 0.3 g / cm³. 3 The water absorption rate is 60%.

[0069] Removing surface burrs from acrylonitrile-butadiene-styrene copolymer workpieces: Fix the acrylonitrile-butadiene-styrene copolymer workpiece in the working area; Wood chips, corundum, and water are mixed to obtain a mixture; Under the conditions of pressure of 1MPa~10MPa, water flow rate of 0.2L / min~3L / min, abrasive flow rate of 0.2kg / min~0.8kg / min, and spraying distance of 7mm~22mm, the acrylonitrile-butadiene-styrene copolymer workpiece is treated by spraying a mixture from a spray gun to obtain acrylonitrile-butadiene-styrene copolymer workpiece with deburred material.

[0070] Example 5 The difference between Example 5 and Example 4 is: By weight percentage, the mixture comprises: 8% sawdust, 18% corundum, and the balance being water; The density of corundum is 4 g / cm³. 3 ; The rest are as described in Example 4.

[0071] Example 6 The difference between Example 6 and Example 4 is: By weight percentage, the mixture comprises: 15% sawdust, 12% corundum, and the remainder is water; The density of corundum is 3.5 g / cm³. 3 ; The rest are as described in Example 4.

[0072] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is as follows: The mixture contains no sawdust; The rest are as described in Example 1.

[0073] Comparative Example 2 The difference between Comparative Example 2 and Example 4 is as follows: The mixture contains no sawdust; The rest are as described in Example 4.

[0074] Performance tests of examples and comparative examples: 1. Deep hole removal rate: The deburred polyetheretherketone workpiece is used as the test sample. Using an S-4800 scanning electron microscope at magnification of 1000~10000, the area of ​​residual burrs in the test sample channel is detected and counted. The channel is a deep hole with a depth of 8mm. The proportion of the area of ​​the channel without residual burrs is calculated and used as the deep hole removal rate.

[0075] 2. Debris Residue Rate: The acrylonitrile-butadiene-styrene copolymer workpiece after deburring is used as the test sample. Using an S-4800 scanning electron microscope at magnification of 1000~10000, the residual debris on the surface of the test sample is detected. The area of ​​the residual debris area is counted, and the proportion of the area without residual debris to the surface area of ​​the test sample is calculated as the debris residue rate.

[0076] 3. Burr removal rate: The polymer material workpiece after burr removal is used as the test sample. Using an S-4800 scanning electron microscope at magnification of 1000~10000, the area of ​​residual burrs in the test sample is detected. The proportion of the area of ​​the test sample without residual burrs is calculated as the burr removal rate.

[0077] 4. Microcrack density: The deburred polyetheretherketone workpiece is used as the test sample. Using an S-4800 scanning electron microscope at magnification of 1000~10000, the number of microcracks on the surface of the test sample is counted, and the microcrack density is calculated by dividing the number of microcracks by the surface area of ​​the test sample.

[0078] 5. Matrix damage: The acrylonitrile-butadiene-styrene copolymer workpiece after deburring is used as the test sample. Using an S-4800 scanning electron microscope at magnification of 1000~10000, the area of ​​surface defects such as microcracks and scratches on the surface of the test sample is counted, and the proportion of the surface area of ​​the test sample to the microcracks and scratches is calculated as the matrix damage.

[0079] 6. Process impact zone temperature: Record the surface temperature of 10 locations in the impact zone of the polymer material workpiece during the deburring process, and take the average value as the process impact zone temperature.

[0080] 7. Surface roughness: Five areas on the surface of the polymer material workpiece after deburring are selected and tested with a surface roughness meter. The average value is taken as the surface roughness.

[0081] 8. Gloss: Using a gloss tester, five areas on the surface of the acrylonitrile-butadiene-styrene copolymer workpiece after deburring were selected and tested at a measurement angle of 60°. The average value was taken as the gloss.

[0082] Table 1 shows some process parameters and performance test results of Examples 1-6 and Comparative Examples 1-6.

[0083] Table 1. Some process parameters and performance test results of Examples 1-6 and Comparative Examples 1-6 Refer to Table 1 and Figures 1-4 As can be seen from Example 1 and Comparative Example 1, the deep hole removal rate of polyetheretherketone (PEEK) workpieces decreased from 90% to 78%, and the burr removal rate decreased from 99% to 92%. This demonstrates that the process for removing burrs from the surface of polymer material workpieces provided in this application can effectively remove surface burrs from PEEK workpieces, and the microcrack density decreased from 0.5 cracks / mm. 2 Increased to 4.2 strips / mm 2The temperature in the process impact zone increased from 45°C to 65°C, and the polyetheretherketone (PEEK) workpiece in Comparative Example 1 also exhibited vitrification, indicating that the process of this application can reduce the damage and thermal deformation risk to the PEEK workpiece. At the same time, the surface roughness increased from 1.6 μm to the appearance of microcracks, further verifying that the process of this application can fill the microcracks on the surface of the PEEK workpiece while reducing the surface roughness, effectively reducing surface defects.

[0084] Referring to Example 4 and Comparative Example 2, the residual debris rate of the acrylonitrile-butadiene-styrene copolymer workpiece increased from 5% to 25%, indicating that the process for removing burrs from the surface of polymeric material workpieces provided in this application can adsorb the debris generated during the process. Furthermore, the matrix damage increased from 0.1% to 5.2%, the surface roughness increased from 1.6 μm to the appearance of microcracks, and the gloss increased from 10 GU to 35 GU. This further verifies that the process of this application can reduce the damage of debris to the surface of the acrylonitrile-butadiene-styrene copolymer workpiece, effectively reduce the surface roughness of the acrylonitrile-butadiene-styrene copolymer workpiece, and make it present a matte surface. At the same time, the temperature of the process impact zone increased from 60°C to 85°C, and thermal deformation occurred in Comparative Example 2, indicating that the process of this application can reduce the frictional heat of the acrylonitrile-butadiene-styrene copolymer workpiece and reduce the risk of thermal deformation.

[0085] Combined with Examples 1-6 and Comparative Examples 1-2, the process for removing burrs from the surface of polymer material workpieces provided in this application is verified. It not only has the effect of removing hidden burrs, but also avoids thermal deformation of polymer materials caused by frictional heat generated during the burr removal process.

[0086] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A process for removing burrs from the surface of polymer material workpieces, characterized in that, The process includes the following steps: Provide water jet spraying equipment including spray guns; The polymer material workpiece is fixed in the fixture of the water jet spraying equipment, and the spray gun is controlled to spray a mixture to treat the surface of the polymer material workpiece according to the preset flow rate, preset pressure and preset spray distance. The polymer material workpiece is a polyetheretherketone workpiece or an acrylonitrile-butadiene-styrene copolymer workpiece; The mixture contains abrasive and water, the abrasive comprising sawdust, the sawdust comprising 8% to 15% of the mixture by mass, and the sawdust having a density of 0.3 g / cm³. 3 ~0.6g / cm 3 .

2. The process for removing burrs from the surface of polymer material workpieces according to claim 1, characterized in that, The water absorption rate of the wood chips is 50%~80%.

3. The process for removing burrs from the surface of polymer material workpieces according to claim 1, characterized in that, Before performing the step of treating the surface of the polymer material workpiece with the sprayed mixture, the process includes: transporting the abrasive and the water to the mixing chamber of the water jet spraying device at the preset flow rate and mixing them to obtain the mixture; the preset flow rate includes the water flow rate and the abrasive flow rate.

4. The process for removing burrs from the surface of polymer material workpieces according to claim 3, characterized in that, The polymer material workpiece is a polyetheretherketone workpiece. By weight percentage, the mixture contains: 8%~15% wood chips, 15%~25% nylon sand, 8%~12% talc powder, and the balance is water.

5. The process for removing burrs from the surface of polymer material workpieces according to claim 4, characterized in that, The volumetric particle size Dv50 of the nylon sand is 0.2mm~1.0mm.

6. The process for removing burrs from the surface of polymer material workpieces according to claim 4, characterized in that, The water flow rate is 0.2 L / min to 5 L / min; And / or, the abrasive flow rate is 0.1 kg / min to 1.2 kg / min; And / or, the preset pressure is 2MPa~20MPa.

7. The process for removing burrs from the surface of polymer material workpieces according to claim 3, characterized in that, The polymer material workpiece is an acrylonitrile-butadiene-styrene copolymer workpiece. By weight percentage, the mixture contains: 8%~15% sawdust, 12%~18% corundum, and the balance is water.

8. The process for removing burrs from the surface of polymer material workpieces according to claim 7, characterized in that, The density of the silicon carbide is 3.5~4.0 g / cm³. 3 .

9. The process for removing burrs from the surface of polymer material workpieces according to claim 7, characterized in that, The water flow rate is 0.2 L / min to 3 L / min; And / or, the abrasive flow rate is 0.2 kg / min to 0.8 kg / min; And / or, the preset pressure is 1MPa~10MPa.

10. The process for removing burrs from the surface of polymer material workpieces according to claim 1, characterized in that, The preset spray distance is 7mm~50mm.

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