137results about How to "High molding strength" patented technology

The invention discloses easy-to-fill precoated sand and a preparation method thereof. Raw materials comprise roughing sand, phenolic resin, curing agents, lubricating agents and additives. The preparation method comprises the following steps that the roughing sand is heated to 130 to 170 DEG C, then, the phenolic rein, a half quantity of the lubricating agents, the curing agents and the rest half quantity of lubricating agents are sequentially added, finally, the discharging is carried out, and then, crushing, sieving and package are carried out. Through the improvement on the raw material ingredients and the preparation process, the forming intensity of the precoated sand is high, the high-temperature intensity is high, the deformation quantity is small, the flowability is good, complicated sand cores can be produced, the surface smoothness of the molding sand is good, the collapsibility performance is excellent, castings can be easily subjected to the vibration sand falling treatment, the precoated sand gas producing quantity is reduced, and the high-temperature performance and other casting performance of the precoated sand are improved.

A wafer processing method for dividing a wafer along a plurality of division lines to obtain a plurality of individual chips. The wafer processing method includes a filament forming step of applying a pulsed laser beam having a transmission wavelength to the wafer along each division line in the condition where the focal point of the pulsed laser beam is set inside the wafer in a subject area to be divided, thereby forming a plurality of amorphous filaments inside the wafer along each division line, and an etching step of etching the amorphous filaments formed inside the wafer along each division line by using an etching agent to thereby divide the wafer into the individual chips along the division lines.

The invention discloses a roadbed slop vertical vibrating compacting device which comprises a vertical vibrating mechanism aslant connected to the side wall of a working device, wherein the vertical vibrating mechanism comprises a vibrating box body, a rotating shaft I and a rotating shaft II which are mutually parallel are rotatably connected into the vibrating box body, a synchronizing wheel I is arranged on the rotating shaft I, a synchronizing gear II meshed with the synchronizing gear I is arranged on the rotating shaft II, an eccentric block I is arranged on the rotating shaft I, an eccentric block II is arranged on the rotating shaft II, a tamping plate supporting against a roadbed slope is connected to a bottom plate of the vibrating box body, and a drive device used for driving the rotating shaft I or rotating shaft II to rotate is arranged on the tamping plate. The roadbed slop vertical vibrating compacting device is capable of carrying out effective vibrating compaction on the roadbed slope, and is good in use effect, easy to operate and convenient to popularize and use.

The invention provides an olefin purification adsorbent and a method thereof for an olefin purification technology, relating to a method for removing trace of methyl alcohol, dimethyl ether and propionaldehyde from olefin material flow. According to the method, a microballoon adsorbent with certain size distribution is prepared by taking kaolin as an inert matrix, aluminum oxide or inorganic silicon-aluminum mixture as an adhesive, and submicron molecular sieve as an active component; under a gaseous phase or liquid phase working condition, the method is used for removing oxy-compound in olefin material flow by a high pressure low temperature adsorption and low pressure high temperature regeneration technology, so that the contents of components of the oxy-compound in the purified olefin product material flow are less than 1ppm (weight ratio), less ethylene and propylene components are lost, the requirements of the olefin purification technology on low pressure drop and large airspeed liquid phase operation are met, and the method can be used in industrial production.

A wafer dividing method for dividing a wafer into individual devices, the front side of the wafer being formed with a plurality of crossing streets for partitioning a plurality of areas where the devices are respectively formed. The wafer dividing method includes the steps of coating the front side of the wafer with a protective film, cutting the front side of the wafer with the protective film along the streets to form a plurality of kerfs each having a depth corresponding to the finished thickness of each device, removing chipping from each kerf by plasma etching, attaching a protective tape to the front side of the wafer, grinding the back side of the wafer to expose each kerf to the back side of the wafer, thereby dividing the wafer into the individual devices, and removing a grinding strain from the back side of the wafer.

To eliminate necessity of separation of a resist film in dicing by etching and thus improve productivity and die strength of a device, thickness of the resist film is adjusted such that when street-correspondent-areas are separated by etching, resist films coated on portions other than the street-correspondent-areas are not remained.

A product information marking method including a back side grinding step for grinding the back side of a wafer having a plurality of devices formed on the front side so as to be partitioned by a plurality of separation lines, thereby obtaining a desired thickness of the wafer. After performing the back side grinding step, a marking step for marking product information on the back side of each device by applying a laser beam to the back side of the wafer is performed before separating the devices from each other. Thus, the product information is marked on each device in the stage of the wafer.

A laser processing method for a semiconductor wafer including a groove forming step of applying a pulsed laser beam having an absorption wavelength to the semiconductor wafer along a division line formed on the semiconductor wafer to thereby form a laser processed groove along the division line on the semiconductor wafer, wherein the pulse width of the pulsed laser beam to be applied in the groove forming step is set to 2 ns or less, and the peak energy density per pulse of the pulsed laser beam is set less than or equal to an inflection point where the depth of the laser processed groove steeply increases with an increase in the peak energy density.

A binder composition for casting mold formation which can give a casting mold having sufficient strength without complicating the production step; and a process for producing a casting mold using the binder composition for casting mold formation. The binder composition for casting mold formation is characterized by comprising an acid-curable resin, water, and the chloride of a metal. The composition is further characterized in that the acid-curable resin comprises furfuryl alcohol and one or more products of the condensation or co-condensation of one or more members selected from a group consisting of furfuryl alcohol, phenols, and urea with an aldehyde, and that the metal is an alkaline earth metal and/or a zinc-family element.

The invention discloses a molding method of a composite material skirt with variable wall thickness. The method comprises the following steps: attaching a component to be formed on the outer side of component one, and connecting component two end to end in a ring shape and attaching to the outer side of the component to be formed , set a vacuum bag on the outer side of the whole formed by the component to be formed and the second component and carry out vacuum treatment, put it into an autoclave for curing and molding, and after the forming of the component to be formed is completed, open the second component along the junction. , and then separate the component to be formed from the component 1 to complete the process of demolding, wherein the component 1 is an annular hard component, and the component 2 is a strip-shaped soft component. Compared with the prior art, the combination of the soft mold and the hard mold is beneficial to improve the quality of the surface forming. By disassembling the soft mold, rapid demoulding is realized without destroying the mold, and the mold can be reused, effectively saving the cost of the mold and reducing the manufacturing cost. .

The invention discloses a regenerative road cold filling material, and relates to the technical field of road paving. The regenerative road cold filling material is prepared from, by weight, 80-120 parts of matrix asphalt, 80-120 parts of milling material, 1-5 parts of cold filling addictive, 10-25 parts of separant, 20-40 parts aggregate and 20-30 parts of polyurethane prepolymer. The milling material is a waste asphalt mixture, the cold filling material is prepared by using the milling material, and the milling material is fully recycled. The polyurethane prepolymer can improve the adhesiveaggregation performance of the cold filling material, so that the cold filling material and a pit slot interface can form a stronger bonding effect, thereby preventing the asphalt mixture from loosening too early or preventing an interface seam of the pit slot from being damaged the pit slot is filled, and then the durability of the cold filling material is improved. After the polyurethane prepolymer and liquid asphalt are fully mixed and solidified, the asphalt is evenly distributed in a spatial net-shaped structure formed by the polyurethane prepolymer, not only is the strength of the cold filling material improved, but also the cold filling material cannot become sticky and soft at a high temperature.

The invention discloses a novel netting type tamping method of a filler for roadbed construction, and belongs to the technical field of building construction. A mode of half pre-buried a tamping-assisting pre-buried rod on a lower side foundation can be realized; the filler matched with an auxiliary tamping plate is laid and filled in a layered manner, and netting node magnetic balls are placed; then, during overall tamping, the auxiliary tamping plate is forced to rotate to assist tamping; meanwhile, a heat release ball is extruded to release heat to trigger netting action after being broken;a migration netting bundle in the auxiliary tamping plate and the netting node magnetic balls are promoted to actively approach and establish connection due to a relationship of a magnetic attractionforce; then, local tamping is carried out on the tamping-assisting pre-buried rod to extrude the migration netting bundle extending into the filler so that a fracturing compaction promoting ball on asurface is forced to break locally; and a self-extending gap opening rod is used as a guide to form a material conveying hole in the filler, a water-based adhesive in the fracturing compaction promoting ball moves and spreads in the filler along the material conveying hole, and a binding force and compactness between the fillers are remarkably improved after curing.

The invention relates to a vacuum mixing injection molding system and a vacuum mixing injection molding method for a membrane filter plate of a filter press, which can fundamentally eliminate air pockets in membranes and filter plates in an injection molding process of the membranes or the filter plates. A discharge port of an injection mold machine is communicated with a barrel body of a vacuum mixer through a feeding solenoid valve, and a control end of the feeding solenoid valve is connected with a signal output end of a controller; a spiral propelling mixer is positioned in the barrel body of the vacuum mixer, and is driven by a motor reducer positioned at the upper part the barrel body of the vacuum mixer to rotate, and a vacuum suction nozzle is communicated with a vacuum air extractor through an air path solenoid valve and an air pipe, and a control end of the air path solenoid valve is connected with the signal output end of the controller; a discharge port of the barrel body of the vacuum mixer is communicated with one end of a through way of a tee joint through the discharge solenoid valve, and the other end of the through way of the tee joint is communicated with a feed port of an injection mold in a butt joint way; and a middle way of the tee joint is communicated with the vacuum air extractor through the air path solenoid valve. The system and the method have the advantages that: the molding strength of the membranes or the filter plates is improved, and the rupture phenomenon does not occur when the membranes bulge and the filter plates are pressed.

The invention relates to a cold patch material for disease repair of asphalt road pavements. The cold patch material is prepared from aggregate, asphalt and a cold patch agent, wherein the aggregate is prepared from crushed stone, machine-made sand and ore powder; the particle size of the crushed stone is 5mm to 16mm; the ratio of oil to stone is 4 to 6%; the amount of cold patch agent in the coldpatch material is 1.0 to 1.5%. The asphalt cold patch material has the characteristics that the defects of easiness in caking, poor durability and poor peaceability in the traditional cold patch asphalt mixture are overcome; the repair can be performed at any time, the peaceability is good, the temperature stability is good, the forming strength is high, the water stability is excellent, the durability is good, the storage is easy and the like; the service life of the cold patch material is effectively prolonged; the application prospect is broad.

The invention relates to sodium silicate surface co-sintered light ceramsite and a preparation method thereof. The light ceramsite and the preparation method have the beneficial effects that by spraying a 5-25% sodium silicate solution step by step, during drying, sodium ions dissolved in water diffuse toward the surfaces along with the moisture and gather on the shells of surfaces of raw meal nodules, the sodium ions on the surface layers react with other matters in the sintering process to form fusible matters, thus playing a role of co-sintering agents, and the content of the sodium ions in the co-sintering agents below the surface layers of the raw meal nodules is very low; the ceramsite sintered at a surface layer sintering temperature has relatively low water absorption but the unsintered density of core regions below the surface layers is lower, so that the light ceramsite with low water absorption and low overall density is finally obtained; the problems that the ceramsite not only requires low water absorption and high strength but also requires light volume weight are solved; the preparation method of the sodium silicate surface co-sintered light ceramsite is simple in process and safe to operate, can be used for volume production and is low in cost.