269results about How to "Improve surface quality" patented technology

The invention provides an electronic device, a ceramic substrate and a preparation method thereof, and relates to the technical field of semiconductors. The ceramic substrate comprises a ceramic base body and a liquid channel layer, the liquid channel layer is arranged in the ceramic base body, the liquid channel layer and the ceramic base body are integrally sintered and formed, the liquid channel layer comprises a liquid channel, the liquid channel is used for containing a cooling medium, and the liquid channel extends in the ceramic base body along a three-dimensional space path. The preparation method of the ceramic substrate comprises the following steps: preparing slurry containing ceramic powder, preparing a sacrificial template matched with a target liquid channel in shape, pouring the slurry to coat the sacrificial template, filling a mold with the slurry to obtain a ceramic blank, removing the sacrificial template to form a hollow channel in the ceramic blank, and sintering to form the ceramic substrate with the liquid channel. The electronic device comprises the ceramic substrate, a component and a liquid cooling circulation system.

The utility model discloses an anti-deformation bearing thin-wall part machining supporting and fixing structure which comprises a base and a supporting assembly, a machining table is connected to the top of the base, clamping blocks are arranged on the two sides of the top of the machining table, and the supporting assembly is arranged in the machining table and comprises a bevel gear ring and a plurality of bevel gears meshed with the bevel gear ring. A lead screw is arranged in the machining table through a plurality of rotating frames, the surface of the lead screw is in transmission connection with a supporting plate through a lead screw nut, the supporting and fixing structure is provided with a supporting assembly, a driving motor drives a bevel gear ring to rotate, a plurality of bevel gears rotate synchronously, then the lead screw is driven to rotate, and the supporting plate ascends to support the interior of the thin-wall part; by means of the internal supporting mode, pressure and friction force borne by the inner wall of the thin-wall part during polishing can be effectively dispersed, deformation caused by lack of supporting is avoided, the size precision, the shape precision and the surface quality of the bearing thin-wall part are guaranteed, the product percent of pass is increased, and waste products are reduced.

The invention relates to the technical field of grinding path optimization, and discloses an abrasive paper grinding path optimization system based on reinforcement learning. According to the system, a grinding task is decomposed through a task analysis module, and a state space is defined by fusing a current position, a historical track and real-time surface roughness through a state construction module. The strategy learning module utilizes a deep reinforcement learning network to carry out iterative training by exploring actions and collecting reward experience in simulation so as to learn an optimization strategy. And the trained network inferes local optimization paths for the sub-regions, and a global grinding path is formed after splicing and smoothing. According to the method, self-adaptive path planning is achieved through autonomous decision-making of reinforcement learning, closed-loop quality control is formed by means of real-time roughness feedback, and the intelligent level of grinding machining and the consistency of workpiece surface quality are improved.

The invention provides a wooden door three-dimensional model parameterization design and numerical control code generation method and system, and relates to the technical field of woodworking numerical control machining and computer vision. A multispectral imaging technology is adopted at a raw material feeding station to obtain a wood board surface multiband image, and a high-definition wood characteristic spectrum is generated through algorithm processing; establishing a mapping rule base of the atlas and numerical control parameters in combination with historical data; the map and the three-dimensional embossment model are superposed, and a tool path and cutting parameters are adaptively adjusted according to texture features to avoid defects and optimize along grains; and finally, numerical control codes matched with wood characteristics are generated, the rotating speed of the main shaft is adjusted according to the hardness, a numerical control machine tool is driven to complete high-precision wooden door machining, and precise numerical control machining based on wood surface characteristic intelligent recognition and self-adaptive adjustment can be achieved.

The application discloses a surface polishing quality evaluation method based on a flexible tactile sensor. In the application, the process of the quality evaluation method is that the flexible tactile sensor is connected at the end of a mechanical arm, so that the flexible tactile sensor is fully contacted with a polishing piece according to a polishing path, the flexible tactile sensor acquires parameters in the process of walking along the path, and after a series of algorithm processing, the surface quality of the polishing piece is represented, and the coordinate points with substandard quality evaluation values are processed again until the whole surface meets the requirements. The system can accurately position the polishing quality of the workpiece surface that does not meet the requirements and optimize the polishing, cooperates with the polishing, is important for improving the polishing quality and efficiency, and introduces a mechanical arm control cabinet to polish the workpiece again so that the calibration position area meets the process requirements, improves the precision and efficiency of traditional polishing surface quality monitoring, can be applied to the quality detection stage of the polishing process, and thus improves the process parameters of the workpiece, and thus improves the surface quality of the subsequent polishing workpiece.

The application discloses a kind of process method and fixture of processing wedge type locking block, method includes S1 preparation plate material;S2 blanking to plate material;S3 heat treatment plate material as blank;S4 numerical milling processing 1: numerical milling blank, drilling forms light hole and thread bottom hole, thread bottom hole tapping processing;S5 numerical milling processing 2: cutting blank;S6 surface passivation treatment;S7 to final inspection;For the fixture for processing wedge type locking block includes clamping seat, pressing plate, first locking screw and second locking screw, clamping seat is provided with clamping through slot, first threaded hole and mounting hole, pressing plate is provided with second threaded hole;By improving process method, multiple process contents are combined, clamping frequency is reduced, semi-finishing requirement in process is increased, no burr can be generated in process, because clamping frequency is reduced, part surface quality is improved;Raw material utilization is higher, is half of all materials of original process scheme, total amount of waste gas emission is reduced by half compared with original process scheme.

The application relates to the technical field of zirconium-niobium alloy material processing, in particular to a preparation method of a large-diameter zirconium-niobium alloy pipe for nuclear industry, which comprises the following steps: S1, mixing nuclear-grade sponge zirconium and niobium scraps, or mixing zirconium-niobium alloy, zirconium dioxide and iron; melting the mixture and preparing a zirconium-niobium alloy ingot; S2, sequentially performing large deformation forging in a beta single-phase zone and an alpha+beta two-phase zone; S3, drilling a central hole in the axial direction of a round-forging blank; quenching in the beta single-phase zone; S4, coating an anti-galling agent on the surface of the central hole and heating to prepare a pipe blank in the mode of cross piercing; S5, performing periodic forging and rolling on the pipe blank; S6, annealing the hot-rolled pipe twice; and straightening the hot-rolled pipe after the second-stage annealing. The zirconium-niobium alloy pipe has uniform microstructure, good mechanical properties and corrosion resistance, the production direction of the brittle hydride is nearly parallel to the circumferential direction of the pipe, and brittle damage of the pipe wall thickness caused by the crack propagation of the hydride is avoided.

This invention discloses an intelligent modular composite milling and turning tool for machining centers, relating to the field of milling and turning tool technology. It includes a turret configured to be rotatably mounted on a machine tool turret base to perform multi-axis composite machining motions. The turret's disc body has a plurality of precision guide grooves arranged in a circumferential array extending radially. This invention constructs a closed fluid circulation loop comprising a spiral cooling pipe, a circulating pump, and a telescopic pipe, and incorporates an adaptive cooling assembly consisting of radial heat dissipation fins and a temperature sensor. This allows for real-time adjustment of coolant flow rate and heat dissipation power based on cutting heat, ensuring the tool holder remains in a constant-temperature machining environment. This effectively avoids dimensional errors caused by thermal deformation and improves the yield rate of machining heat-sensitive materials.

The utility model belongs to the field of bar rolling technology relates to a kind of high-precision special steel bar reducing sizing production system, including two two-high rolling mill, two three-high rolling mill, water tank after reducing sizing and finished product collection system being sequentially arranged along the rolling direction.The utility model is innovatively configured with the combination of 2 two-high rolling mill of low cost and 2 high-precision three-high rolling mill, and an efficient reducing sizing production system is constructed.Compared with traditional three-high rolling mill system, this design significantly reduces the number of expensive three-high rolling mill, thereby reducing equipment purchase and maintenance costs.At the same time, two high rolling mill leads the primary rolling of large-scale bar, effectively reducing energy consumption and production cost.This configuration ensures product precision while significantly optimizing cost structure, especially suitable for production scenarios with high economic requirements.

The invention provides a surface roughness quantification method with a hidden surface and a readable storage medium. The method comprises the following steps: acquiring an initial binary image; wherein the initial binary image comprises a surface profile curve with a hidden surface; fitting according to the surface profile curve to obtain a theoretical datum line; obtaining a reference binary image and an actual binary image corresponding to the reference binary image according to the theoretical reference line and the surface profile curve; the theoretical information entropy is obtained through calculation according to the reference binary image, the actual information entropy is obtained according to the actual binary image, the relative information entropy of the actual information entropy relative to the theoretical information entropy is obtained with the theoretical information entropy as the reference, and the relative information entropy is used for representing the surface roughness with the hidden surface. According to the method, the surface roughness of the hidden surface is quantified through the relative information entropy, and the surface roughness of different parts can be quantitatively evaluated by comparing the relative information entropy of the different parts.

This utility model provides an online cleaning mechanism for the surface of a pressing hammer, belonging to the technical field of shaped block processing equipment. It includes a rotary support assembly and several scraping plates. The rotary support assembly is connected to the support platform of a rotary shaped block making equipment. Each scraping plate is spaced apart along the circumferential direction of the rotary support assembly. Each scraping plate corresponds one-to-one with a pressing hammer surface, and each scraping plate is flush with the pressing hammer surface in the raised state. The rotary support assembly is used to drive the scraping plates to scrape away the shaped material adhering to the pressing hammer surface when the pressing hammer surface is in the raised state. The rotary support assembly also drives each scraping plate to move to the side of the corresponding pressing hammer surface to form a clearance state. The online cleaning mechanism for the pressing hammer surface provided by this utility model can improve the timeliness of scraping away the shaped material adhering to the pressing hammer surface, thereby improving the shaped block processing efficiency and the surface forming quality of the shaped blocks.

The application provides a swept-back three-beam thin wing composite wing structure, which comprises a wing main body and an aileron installed in a wing main body mounting groove, the wing main body comprises a wing skeleton and a wing outer skin structure outside the wing skeleton; the wing skeleton comprises a longitudinal member unit and a transverse member unit, the longitudinal member unit comprises a front beam, a middle beam and a rear beam, the front beam and the middle beam and the middle beam and the rear beam are arranged at acute angles, the transverse member unit comprises a plurality of wing ribs arranged between the front beam and the middle beam, between the middle beam and the rear beam and on one side of the front beam towards the front of the fuselage; the front beam, the middle beam and the rear beam are all provided with a spar connecting head for connecting with the fuselage. The wing provided by the application adopts a three-beam structure, each wing beam has a mouth-shaped cross section, so that each wing beam forms a multi-wall form, can bear the bending moment and the torque brought by a large wing effective load, and the wing structure is light in weight, high in strength and good in integrity.

The utility model provides a multifunctional double-cavity vacuum coating device which comprises a spraying chamber and a vacuum coating chamber, the vacuum coating chamber is arranged at the top of the spraying chamber, and the vacuum coating chamber is communicated with the spraying chamber through a through hole. A rotating frame is arranged in the spraying chamber, the rotating frame is connected into the spraying chamber through a guide column, the guide column is vertically connected into the spraying chamber, the rotating frame is in driving connection with a driving device, and the driving device drives the rotating frame to ascend into the vacuum coating chamber for vacuum coating. According to the utility model, priming paint coating, vacuum coating and finishing paint coating are integrated into one device, so that workpiece carrying is reduced, workpiece collision is avoided, the surface quality of workpieces is improved, and the production efficiency is improved. The spraying chamber and the vacuum coating chamber which are arranged up and down can reduce the occupied area of equipment, and the rotating frame keeps rotating at a constant speed in the spraying process, so that spraying is more uniform, and the quality of workpieces is improved.

The utility model relates to the field of stamping devices, and discloses a novel hardware stamping part surface scratch prevention device which comprises a bottom plate and a stamping seat, the top of the bottom plate is fixedly connected with a supporting column, the bottom of the supporting column is fixedly connected with a hydraulic rod, and the driving end of the hydraulic rod is fixedly connected with a stamping block. Two rotating shafts are rotatably connected to the interior of the stamping block, rotating bending shafts are fixedly connected to the exteriors of the rotating shafts, a second convex button is fixedly connected to the front side of each rotating bending shaft, a reset button is fixedly connected to the front side of each rotating bending shaft, and two first convex buttons are fixedly connected to the front side of the stamping block; and the front side of the stamping block is fixedly connected with a fixed block. According to the bending device, the two rotating bending shafts are driven by the hydraulic rod to rotate in a contact mode to bend a workpiece, workpiece surface scratching possibly caused by direct contact extrusion is effectively avoided, and the surface quality of a product is greatly improved.

This invention discloses an elliptical ultrasonic-assisted spinning forming apparatus and method. The apparatus includes a workpiece fixture that drives the workpiece to rotate around its centerline. A spinning wheel is freely rotatable and mounted on a tool holder, which is mounted on a feed drive mechanism. The feed drive mechanism, in conjunction with the rotation of the workpiece fixture, allows the spinning wheel to roll over various parts of the workpiece's side surface. A first amplitude transformer is connected at one end to the tool holder and at the other end to a first transducer. A second amplitude transformer forms an angle with the extension direction of the first amplitude transformer, with one end connected to the tool holder and the other end connected to a second transducer. An ultrasonic generator is connected to the first and second transducers to drive the tool holder and the spinning wheel via the first and second amplitude transformers, performing ultrasonic vibration in directions perpendicular and parallel to the workpiece's centerline. The method utilizes this apparatus. By appropriately setting the ultrasonic phase and amplitude, the workpiece surface can be impacted both perpendicularly and tangentially, improving the quality of the spun workpiece.

The utility model relates to the technical field of door plate machining, in particular to a transverse cutting saw structure for door plate forming. The transverse cutting pressing roller assembly comprises a pressing roller fixing support. A plurality of pressing roller rotating shafts are rotationally connected to the pressing roller fixing bracket; the pressing roller rotating shafts are arranged in the width direction of the transverse cutting main support. A plurality of pressing rollers are uniformly distributed on the pressing roller rotating shaft; and the pressing roller is fixed on the pressing roller rotating shaft. When the plate cutting device is used, plates can still be stably conveyed and cannot jump up in the cutting process, the cutting precision of products is improved, the surface quality of the cutting faces of the plates is improved, and abrasion of the saw disc is reduced.

The application provides a method for post-processing of a photosensitive resin component, and belongs to the technical field of photosensitive resin, and comprises the following steps: immersing the photosensitive resin component into a solution to obtain an intermediate; and sequentially performing atomization treatment and solidification on the intermediate to complete the post-processing. The photosensitive resin component is placed in an atomized environment for photocuring, the surface properties of the component are improved, the adhesion of the model surface is reduced to a certain extent, the surface color of the original component is changed, the surface smoothness is increased, the surface quality of the component after solidification is improved, the surface protection effect of the component is achieved, and the service life of the photosensitive resin component is prolonged.

The utility model discloses an automatic rotating floating adjusting device for an automobile door of an automobile assembly line, which relates to the field of automobile assembly and comprises a support frame, a lifting platform is arranged at the top end of the support frame in a lifting manner, a first rotating shaft is rotatably connected in the lifting platform, and clamping hands for clamping the automobile door are arranged at two ends of the first rotating shaft. Telescopic mechanisms are arranged in the two clamping hands, at least two shaft sleeves are fixed to the outer side of the first rotating shaft, connecting arms are fixed to the outer sides of the two shaft sleeves, the connecting arms are supported at the bottom end of the vehicle door, and a pressure sensor is embedded in the lower surface of the lower pressing plate, so that the clamping force can be monitored in real time, and it is ensured that the vehicle door cannot be damaged due to improper force in the clamping process; and the telescopic mechanism can be adaptively adjusted according to the thicknesses of different vehicle doors, the application range is wider, high-precision positioning and angle adjustment of the vehicle doors can be achieved through the automatic rotating and telescopic adjusting mechanism, perfect matching of the vehicle doors and a vehicle body is ensured, and the assembly quality is improved.

The utility model belongs to copper foil hot pressing processing equipment technical field especially for a kind of copper foil hot pressing processing device, including work bench, the upper end of work bench is respectively fixed mounting with heating bearing plate and fixed frame, the top of fixed frame is inserted with guide insertion rod, the top of fixed frame is fixedly installed with hydraulic cylinder, the lower end of guide insertion rod is connected with buffer structure, the output of hydraulic cylinder is fixedly connected with buffer structure, the utility model can accurately control the relative position between cutting tool and pressing plate by limiting component, ensure in hot pressing processing and cutting process, cutting tool can accurately aim at copper foil and carry out cutting, to greatly improve the machining accuracy, simultaneously, the adaptive design of limiting insertion rod and limiting insertion hole, and the reset action of spring two, ensure the stability of cutting tool after multiple uses, reduce the processing error caused by position deviation.

The utility model relates to the technical field of mould pressing devices, in particular to a vacuum adsorption precise mould pressing device. A plurality of adsorption holes are uniformly distributed in the surface of the lower die; the adsorption hole penetrates to the bottom of the lower die; a connecting pipe communicated with the adsorption hole is fixed at the bottom of the lower die assembly; the connecting pipe is connected to a vacuum pump. When the device is used, gas between the inner cavity of the lower mold and preformed glass can be quickly pumped away in the initial stage of compression molding through the connecting pipe and the adsorption holes by the vacuum pump, so that gas residue between the inner cavity of the lower mold and the preformed glass is reduced to a great extent, and the preformed glass is more attached to the surface of the cavity of the lower mold during molding; and the surface quality of glass forming is higher.

This invention belongs to the field of material surface treatment technology, specifically relating to a wafer polishing slurry, its preparation method, and its application. The wafer polishing slurry comprises abrasives, oxidants, dispersants, surfactants, pH adjusters, and water. The components of the wafer polishing slurry work synergistically, shortening polishing time and improving polishing efficiency when applied to wafer polishing. Furthermore, it significantly improves the surface quality of the polished wafer, markedly reducing scratches and defects, and lowering surface roughness to below 0.15 nm, thus meeting the surface quality requirements of fields such as power electronics and radio frequency devices.

The application provides a superfine diamond ceramic bond tool bit and a preparation method and application thereof, relates to the technical field of grinding tools, and comprises a base material and a functional additive; the base material comprises the following raw materials in parts by mass: 10-30 parts of a ceramic bond, 50-70 parts of diamond abrasive, 1-20 parts of a filler and 1-20 parts of a nano polishing agent; wherein the diamond abrasive is an irregularly shaped diamond aggregate; the functional additive comprises a temporary binder and a dispersing agent, the temporary binder accounts for 1-10% of the total mass of the base material, and the dispersing agent accounts for 1-10% of the total mass of the base material. The superfine diamond is not caused to agglomerate in the mixing process by changing the mixing mode of the diamond and introducing the diamond in the form of an irregularly shaped diamond aggregate, and the surface roughness of a workpiece is greatly improved by adding a spherical nano polishing agent, and the process is simple, controllable and stable.

The present application relates to the fast milling processing method of the complex structure and shape section parts of the airplane, and belongs to the field of aviation sheet metal forming technology. The present application solves the one-time processing of the appearance milling and drilling of the traditional complex cross-section shape and different size section parts, discards the drilling precision ensured by the drilling jig for the hole making of the section part, improves the surface quality of the section part, improves the manufacturing precision of the appearance, notch, bevel and hole, improves the processing efficiency, completes a set of tooling capable of processing different specifications of section parts through the pneumatic universal drilling and milling jig, realizes the efficient and accurate manufacturing of the section part, realizes the group milling of the workpiece, and further reduces the raw material cost, tooling manufacturing cost and shortens the process flow.

The invention provides a high-strength complex-section cavity product cutting device which comprises a height adjusting mechanism, a radian adjusting mechanism, a follow-up mechanism and a cutting unit which are sequentially arranged from bottom to top. The cutting-off unit comprises a vertical cutting-off mechanism used for cutting off material belts on the two sides of the cavity product and a horizontal cutting-off mechanism used for cutting off a reinforcing rib structure in the middle of the cavity product. The invention further provides a cutting-off method which comprises the following steps: pre-punching and cutting off a process hole in advance in a material belt before rolling forming, and integrally cutting off a cavity product by adopting a regional secondary cutting-off mode after rolling forming. Follow-up continuous cutting of high-strength complex section type cavity products can be achieved on a rolling line, the cutting efficiency is high, the quality is good, the product rework rate is greatly reduced, and the service life of a cutter is remarkably prolonged; the device is flexible to use and high in universality, and can be adapted to cold-bending profiles with various different section types through replacement of the standard cutting head.

The present application relates to laser processing equipment technical field, specifically said is a kind of transformer oil tank laser rust cleaning system, including annular spliced track being horizontally arranged in the top of transformer oil tank, first sliding seat and second sliding seat are slidably connected on annular spliced track;Through the cooperation of pressing assembly, cylinder and double-shaft motor, the driving roller directional movement is automatically triggered when laser surface treatment mechanism moves up and down, seamless closed loop of processing, area switching, reprocessing is realized, manual adjustment equipment position or switching function is not needed, labor intensity and operation complexity are greatly reduced;Laser processing mode avoids the safety hazards such as metal dust inhalation, splashing scratch caused by manual polishing, and the moving speed and processing intensity of mechanism are stable and controllable, effectively solve the problem that manual operation is prone to corrosion residue or excessive polishing damage oil tank steel, significantly improve processing quality.

The invention belongs to the technical field of reinforcing steel bar straightening, and discloses a reinforcing steel bar straightening device for civil engineering construction, which comprises a fixed bracket, a driving assembly is arranged at the upper end of one side of the fixed bracket, a striking assembly is fixedly mounted on the top surface of the fixed bracket, and a connecting assembly is arranged on one side of the top surface of the fixed bracket. A straightening assembly is arranged in the middle of the top face of the fixing support, the connecting assembly comprises a rotating unit, and an abutting piece is fixedly installed at the top of the rotating unit. Through cooperation of a limiting ring, a connecting rod and other structures, a moving rod moves towards the position close to the connecting rod, a striking unit rotates, when an abutting piece does not abut against the moving rod, the striking unit continuously swings to impact a second straightening piece, a large amount of energy can be instantly released through impact, scratches and damage to the surface of a reinforcing steel bar are reduced, and the service life of the reinforcing steel bar is prolonged. And the good surface quality of the material is kept, and the effects that the material is not prone to deformation or fracture when stressed, and the fracture risk during fatigue is reduced are achieved.

The application discloses a surface-defect-free high-purity oxygen-free copper wire manufacturing method based on continuous extrusion, relates to the field of non-ferrous metal precision machining technology, and directly adopts an up-drawing continuous casting billet to extrude a target specification wire rod in one step through continuous extrusion, so that a plurality of drawing processes and at least one intermediate annealing process in a traditional process are completely omitted, a process flow is compressed by more than 60%, a production cycle is significantly shortened, equipment investment, labor cost and energy consumption loss are reduced, wire rod production efficiency is greatly improved, large-scale production cost is greatly reduced, and the application has a strong industrialization advantage; the continuous extrusion process introduces large plastic deformation, can strongly break original as-cast coarse grains, and simultaneously compacts and eliminates internal defects such as pores and shrinkage porosity generated in the up-drawing continuous casting process, and improves wire rod density. Compared with a traditional processing method, the wire rod prepared by the application avoids problems such as annealing oxidation, uneven structure and performance fluctuation, and the elongation of a finished product is greater than or equal to 40%.

The utility model relates to a multi-chamber body strip steel sanding line which comprises a dust removal unit, a sand blowing high-pressure fan unit and a sanding chamber body consisting of a plurality of sanding units and a high-pressure fan sand blowing dust removal chamber, the multiple sanding units are sequentially arranged in series in the advancing direction of a steel belt, and each sanding unit comprises a sanding chamber and a dust removal chamber communicated with the sanding chamber. The high-pressure fan sand blowing dust removal chamber is mounted on one side of the sanding unit and communicates with the interior of the sanding unit; the sand-blowing high-pressure fan unit is arranged on the high-pressure fan sand-blowing dust removal chamber and is used for blowing air into the high-pressure fan sand-blowing dust removal chamber; the dust removal unit is installed on the outer side of the sanding chamber body and used for removing dust. The utility model has the effects of reducing the usable area of a workshop, saving energy, reducing the emission of dust-containing waste gas and improving the environment of the workshop.

This invention relates to the field of polymer materials technology, and discloses a polypropylene foamed bead, a molded polypropylene foamed bead, its preparation method, and its application. The polypropylene foamed beads are obtained by foaming a foaming composition containing polypropylene microparticles; the average particle size of the polypropylene microparticles is ≤1 mm, the aspect ratio of the polypropylene microparticles is ≤1.2, the ash content is ≤400 ppm, and the bulk density is >0.35 g / cm³. 3 The polypropylene foam beads have a particle size of less than 1 mm, a bulk ratio to apparent size ratio of ≤1.6, and a closed-cell rate of ≥99%. This significantly reduces energy consumption during foam bead molding, and the foam bead molded bodies prepared from these beads exhibit superior appearance, mechanical properties, and thermal insulation properties. The shrinkage rate of the polypropylene foam bead molded bodies is less than 1.5%. This is particularly advantageous for preparing thin-walled or complex-shaped EPP molded products.

The utility model relates to a kind of composite membranes for vacuum bag compression molding, the composite membranes for vacuum bag compression molding include demoulding layer, first glue point adhesive layer, isolation layer, second glue point adhesive layer and air-permeable felt layer which are sequentially laminated;The grammage of the first glue point adhesive layer and the second glue point adhesive layer is independently 4~7g / m 2 ;In vacuum bag compression molding, the composite membranes for vacuum bag compression molding of the utility model can be laid once, save time, help to vacuum, improve the surface quality of product, have good flatness, easy demoulding.