31results about How to "Precise control of dimensional accuracy" patented technology

The invention discloses a processing method of surface-mounted pads on a thick copper circuit board. The processing method comprises the following steps: S01. patterning an external layer for the first time; 2. etching the external layer for the first time; 3. patterning the external layer for the second time; 4. etching the external layer for the second time; and 5. manufacturing a solder mask bridge among the surface-mounted pads by a fractional solder resisting method. The processing method has the beneficial effects that the surface-mounted pads are manufactured by a partitioned etching method, which strengthens size control of the surface-mounted pads and meets the design requirements; and the solder mask bridge among the surface-mounted pads are manufactured by utilizing the fractional solder resisting method so that the solder mask bridge and the circuit board are firmly connected together and are not easily separated from each other.

The invention discloses a rolled part temperature collection method for a plate and strip hot rolling production line, which comprises the following steps of: constructing equipment arrangement of theplate and strip hot rolling production line, and obtaining related process parameters; dividing a rolled part heat exchange area according to equipment arrangement on the production line, wherein theheat exchange area comprises an air cooling area, a water cooling area, a roll gap contact heat conduction area and a heat radiation heat preservation area; dividing width-thickness section grid nodes of the rolled part, and establishing coordinate system parameters and a temperature calculation model of each node; obtaining initial temperature distribution of the rolled part at the initial calculation position; from the initial calculation position to the final calculation position, the heat exchange area where the rolled part section is located is judged firstly when calculation is conducted every time, and then the temperature distribution of the rolled part section at the position is calculated through a corresponding rolled part temperature model. The method has the beneficial effects that the principle is clear and definite, assumption and simplification conditions are few, the temperature field change of the rolled part on the given hot rolling production line can be accuratelyforecasted, and the calculation precision is higher than that of an analytical method.

The invention discloses a carbon-ceramic brake disc with a wear-resistant and anti-oxidation coating and a preparation method of the carbon-ceramic brake disc. The preparation method comprises the following steps that grooving treatment is conducted on the upper surface and the lower surface of a carbon/carbon composite material disc body, then coating slurry is brushed in a groove in the upper surface till the groove in the upper surface is filled with the coating slurry, and then the carbon/carbon composite material disc body is turned over, the groove in the lower surface is coated with the coating slurry till the groove in the lower surface is filled with the coating slurry, thus the carbon/carbon composite material disc body containing the coating slurry is obtained, curing, carbonization and ceramization treatment are sequentially conducted, and the carbon-ceramic brake disc is obtained. The preparation process of the wear-resistant and oxidation-resistant coating is simple, large-scale industrial mass production is easy to realize, the coating is bright and smooth in appearance, the bonding strength between the coating and the disc body is high, the size precision is easy to accurately control, and the problem that the size is easy to control inaccurately when the ceramic brake disc is subjected to machining treatment can be effectively solved.

The invention discloses an injection molding device and an injection molding method. The device comprises an upper mold and a lower mold; a steel needle insert with a steel needle is arranged on the upper mold or the lower mold; a layer of elastic film is arranged on the mold surface, opposite to the steel needle, of the upper mold or the lower mold; the shape and the size of the steel needle are the shape and the size needed to form microholes by injection molding; and the steel needle is projected to the elastic film from the upper mold or the lower mold, and is set to enable the end surface of the steel needle to press into the elastic film after mold closing. The device and the method can effectively solve the problems of difficult manufacturing of micron-scale microholes and microhole arrays, poor size precision and great possibility of generation of defects and flanges in hole mouths in traditional injection molding device and method.

The invention relates to a composite forming method of a component with a large-angle thin-wall twisted narrow-depth cavity feature. The composite forming method comprises the steps of model reconstruction, mold manufacturing as well as processing and forming; the model reconstruction comprises the steps that a three-dimensional model of the component is reconstructed in software, two side wing thin walls of the component three-dimensional model are unfolded outwards towards the two sides to form the three-dimensional model of a pre-machined part; mold manufacturing comprises the steps that acorrecting mold comprising a plurality of mold components is manufactured according to the outline design of the component; and processing and forming comprise the steps that production and processingof the pre-machined parts of a plate part is performed, then, the two side wing thin walls which are unfolded outwards of the pre-machined part are heated and folded inwards by using the correcting mold, and component processing is completed. Compared with the prior art, the component is reconstructed into the pre-processing part with no deep-cavity features, the side wing sheets on the two sidescan be recovered to form the large-angle twisted narrow-depth cavity during heating and folding, the defect that the narrow-depth cavity is damaged or lost due to the fact that the cutting processingis directly adopted can be overcome, and the product precision and the finished product rate are guaranteed to the maximum degree.

The invention discloses a flat head cutting device for end faces of barrel products and belongs to the technical field of machine manufacturing. The flat head cutting device comprises a case, a gear motor and drive structure, a drive shaft, a face plate, a cutting machine and saw blades and a dust collecting fan component. The gear motor and drive structure is adopted to drive the drive shaft to rotate, and further drive the face plate fixed on the drive shaft to rotate. The cutting machine arranged above the face plate drives the saw blades to rotate so that dimensional precision of activated carbon sintered filter element products can be controlled accurately. The flat head cutting device is simple in structure, convenient to operate, low in manufacturing cost, safe and reliable in performance, further has small power consumption, less failure due to low rotation speed, is a novel energy-saving product, and fills the gap of the flat head cutting device for the end faces of the barrel products.

A precision control tool for welding a titanium alloy thin-wall winding drum comprises a clamping disc which is used for being arranged in the thin-wall winding drum to be welded in a sleeved mode and supporting the inner wall of the thin-wall winding drum in the radial direction of the thin-wall winding drum; the clamping disc is composed of a first disc body and a second disc body which are matched through bevels; and the precision control tool further comprises an adjusting device used for applying pressure to the first disc body and the second disc body in the axial direction of the clamping disc so as to drive the first disc body and the second disc body to move along the bevels, and then the outer diameter of the clamping disc is adjusted so that the inner wall of the thin-wall winding drum can be stably supported. Staggered mounting is achieved due to bevel butt joint of the clamping disc, the size of the clamping discs can be accurately controlled while tool installation is facilitated, it is guaranteed that the surface of a thin plate of the titanium alloy thin-wall winding drum is stressed stably and evenly, and the thin plate of the titanium alloy thin-wall winding drum is effectively prevented from deforming in the welding process.

The invention provides a method for achieving automatic feeding control of a tailstock of a numerically-controlled lathe through motor. A connecting device for connecting and separating a saddle and the tailstock of the numerically-controlled lathe is used for the method, and comprises a centering assembly, a rotating arm assembly and a driving assembly. The centering assembly comprises a centering shaft (1) and a V-shaped block (2). The rotating arm assembly comprises a rotating arm (4), a rotating shaft (5), a shaft sleeve (6) and two limiting pressing blocks (7). The driving assembly comprises a pair of band transmitting parts, a driving motor (9), a reset switch (14) and a controller (15), the controller (15) is installed in a power distribution cabinet of the lathe, the reset switch (14) is installed on the front face of the saddle of the numerically-controlled lathe and electrically connected with the controller (15), and the driving motor (9) is fixedly connected with the tailstock of the numerically-controlled lathe, and electrically connected with the controller (15).

The invention relates to a plate mounting device and a leveling mounting method thereof. The plate mounting device comprises profiles, grooves are dug in the profiles, and plates are inserted in the grooves of the profiles. The leveling method of the plate mounting device comprises the following steps that (1) firstly, the ground is leveled, the side faces of the profiles are attached to a structural wall, the bottom faces of the profiles are attached to the ground, and the profiles are fixed; and (2) the plates are sequentially inserted into the grooves of the profiles. By means of the mounting mode that the profiles are placed firstly, mounting can be convenient, the size and the horizontal precision in a decoration completed face can be accurately controlled, the mounting process is simple, the construction efficiency and the construction quality are obviously improved, manpower and financial expenditure is saved for enterprises, dust in the operation link is little, and the environment-friendly effect is good.

The invention discloses a manufacturing method for polymer composite products. The method comprises a preparation step, a pre-treatment step, a combination step and a cooling step. The preparation step is to form a semi-finished product by using a non-polymer material and form a to-be-treated member capable of cooperating with the semi-finished product by using the polymer material; the pre-treatment step is to heat the to-be-treated member and to coat an adhesion agent on the semi-finished product; the combination step is to combines the semi-finished product and the to-be-treated member; and the cooling step is to cool the to-be-treated member. In the pre-treatment step, the semi-finished product and the to-be-treated member are formed in advance, so that size precision and possible deformation of the semi-finished product and the to-be-treated member can be controlled accurately so as to increase shape accuracy; and in cooperation with the adhesion agent and the characteristic of expansion caused by heat and contraction caused by cold of the material, so that the combination force between the semi-finished product and the to-be-treated member can be greatly increased.

The invention relates to the field of cutting devices, in particular to a device for cutting gel paste. The device is characterized by comprising a conveying device, a cutting device and a power device, wherein the conveying device comprises a first cylinder and a conveying groove; the first cylinder is arranged on the second half part of a guide rail; wheel teeth are arranged on the lower surface of the first half part of the guide rail; a cylinder rolling component is arranged at the front end of the conveying groove; a flywheel is fixed on one side of the cylinder rolling component and is in meshed connection with the first half part of the guide rail through the wheel teeth; the cutting device is arranged at the front end of the cylinder rolling component and comprises a tool and a second cylinder which is connected with the tool; the power device comprises a first power device and a second power device, which are connected with each other; and the second power device is respectively connected with the first cylinder and the second cylinder. By the adoption of the device, the accuracy of the cutting size of the gel paste is improved, labor is greatly saved, and working efficiency is improved.