People have used various types of internal mixers to make rubber. Rotor is the core component of the main engine of internal mixer, and its shape is generated according to strict curve. Grouping operation requires consistent action and tight and reliable meshing size. Its manufacturing level is directly related to the loading and unloading speed, production efficiency and the smooth operation of the whole machine. The previous manufacturing processes were casting, sand cleaning, grinding and shaping, machining, welding alloy grinding and testing. The rotor blank is first cast and sandblasted, and then sent to the riveting and welding workshop. In the riveting and welding workshop, the pair of rotors are placed on a set of V-shaped irons, the rotors are manually rotated to find out the interference parts of the two rotors, marked with a marker pen, and then the redundant parts are manually polished off. This is repeated until the meshing between the two rotors is smooth, and the work in the "grinding and forming" stage is always polished by hand. However, it can not accurately meet the requirements of drawing processing. The rotor processed by this method has a large error, which affects the rubber mixing process parameters such as rubber shearing force and filling coefficient, and greatly reduces the quality of rubber. Moreover, because the rotors are processed in groups, in the after-sales service process, if one of the rotors is worn, it needs to be replaced together, which is costly and wasteful.

Summary of the invention

The purpose of the invention is to provide a production method for processing the rotor body of an internal mixer by numerical control technology. The invention adopts the following technical scheme to achieve the purpose of the invention, namely, a production method of an internal mixer rotor body, which comprises the following steps.

(1) casting and sand cleaning; Putting the mold into a sand box for modeling, then pouring to obtain a casting blank of the rotor body, and cleaning the iron sand on the surface of the casting blank with a vibrator;

⑵ According to the size information of the long and short sides of the rotor, the rotor surface equation is established by using three-dimensional software Pro/Engineer, using space solid geometry and analytic geometry;

⑶ Establish a three-dimensional solid model. Using the rotor surface equation obtained in step ⑶ 2 and the surface command of the three-dimensional software Pro/Engineer, the three-dimensional solid model diagram of the rotor is established, and the simulated meshing animation of the rotor is made;

(4) generating a machining program code; Generating a machining program code from the three-dimensional solid model diagram obtained in step (3) by using three-dimensional software Pro/Engineer and MasterCAM;

(5) NC machining: the program code generated in step (4) is stored in the memory of the NC vertical machining center, and the 360-degree machining of the rotor body is completed through four indexing rotations in the circumferential direction of the surface of the rotor body;

(6) welding alloy and grinding; Carrying out surface butt welding alloy treatment on the rotor body obtained in the step (5), and polishing to make the surface of the rotor body smooth;

(7) Detection: the shape and volume of the rotor body obtained in step (6) are detected. Due to the adoption of the technical scheme, the purpose of the invention is well achieved, and the numerical control technology is adopted to process the rotor body of the internal mixer, which greatly improves the processing external dimension of the rotor body, improves the processing quality of the rotor body, shortens the production cycle, reduces the production cost and greatly improves the rubber quality of users in the rubber mixing process.

Mode for carrying out that invention the present invention will be further explain with reference to examples. A method for manufacturing a rotor body of an internal mixer comprises the following steps

(1) casting and sand cleaning; Putting the mold into a sand box for modeling, then pouring to obtain a casting blank of the rotor body, and cleaning the iron sand on the surface of the casting blank with a vibrator;

⑵ Modeling is carried out according to the dimension information of the long and short sides of the rotor, and the rotor surface equation is established by using three-dimensional software Pro/Engineer by using space solid geometry and analytic geometry;

Pro/Engineer operating software is 3D CAD/CAM/CAE software under PTC. Pro/Engineer software is famous for its parameterization, and it is the earliest user of parameterization technology. At present, it plays an important role in the field of 3D modeling software. Pro/Engineer, as a new international standard in the field of mechanical CAD/CAE/CAM, has been recognized and popularized by the industry. It is one of the mainstream CAD/CAM/CAE software in domestic product design field. Open the three-dimensional software Pro/Engineer, and use the equation mode in the curve command to input the size information of the long and short sides of the rotor, thus establishing four curve equations of the rotor surface;

Xl = — LXt，Yl = — D/2 X Sin A，Zl = — D/2 X Cos AX2 = LX T，Yl = — D/2 X Sin A，Zl = — D/2 X Cos AX3 = — LX T，Yl = D/2 X Cos AX4 = LXt， Yl = — D/2 X Sin A，Zl = D/2 X Cos As = LXt/Tan 0，A = 2 X S/D X 188

Where x, y and z are the rectangular coordinates of the four surface equations in space, l is the design length of the rotor, t is the gradual change parameter between 0 I, s is the arc length of the rotor in the rectangular coordinate system, d is the base circle diameter of the long and short sides, 0 is the rotation angle of the long side space, and a is the rotation angle of the short side space;

⑶ Establish a three-dimensional solid model. Using the rotor surface equation obtained in step ⑶ 2 and the surface command of the three-dimensional software Pro/Engineer, the three-dimensional solid model diagram of the rotor is established, and the simulated meshing animation of the rotor is made;

(1) Use the variable cross-section scanning command in the three-dimensional software Pro/Engineer surface mode to draw the long and short side cross-sections and scan the cross-sections to draw the basic outline of the rotor surface;

(2) Use the surface cutting command to further trim and sew the surface to make it smooth and complete and meet the design requirements of the drawing;

(3) filling the interior of the rotor surface with the command of filling the surface group, so that the rotor body is completely closed and enriched into a solid shape;

(4) under the command of component animation, making simulation animation of the rotor body, and if there is interference, returning to steps (2) and (3) in step (3) for further optimization;

(4) generating a machining program code; Generating a machining program code from the three-dimensional solid model diagram obtained in step (3) by using three-dimensional software Pro/Engineer and MasterCAM;

Mastercam is a CAD/CAM software based on PC platform developed by American CNC software company. It integrates the functions of 2D drawing, 3D solid modeling, surface design, voxel assembly, NC programming, tool path simulation and realistic simulation. It has convenient and intuitive geometric modeling. Mastercam provides an ideal environment for designing the shape of parts, and its powerful and stable modeling function can design complex curve and surface parts. MasterCAM version 9. 0 and above also support the Chinese environment, and the price is moderate. It is an ideal choice for small and medium-sized enterprises, an economical and effective all-round software system, and a CAD/CAM system widely used in industries and schools. ① The rotor body is divided into four equal parts with three-dimensional software Pro/Engineer, numbered as 0, 90, 180 and 270 respectively, and these four surfaces are saved as the default format (IGES format) of the machining software MasterCAM;

(2) Open the 0 flat file with MasterCAM software (here, take the 0 flat file as an example, other 90 flat files, 180 flat file and 270 flat file. Face file operation steps are consistent), click the tool command tool path-surface-finishing-parallel, and fill in the processing parameters in the dialog box (including tool diameter 32mm, feed speed 400mm/Min, spindle speed 900r/Min, cutting speed 100mm/Min, cutting distance 20mm, cutting torque 3. The machining accuracy is 0. 0mm. )

(3) Using the tool path command in MasterCAM software, the machining path program obtained in the last step is verified for solid cutting to see if there is interference. If there is interference, some parameters are modified for verification, and finally the machining path program codes of the four curved surfaces of the rotor body are obtained after verification;

(5) NC machining: the program code generated in step (4) is stored in the memory of the NC vertical machining center, and the 360-degree machining of the rotor body is completed through four indexing rotations in the circumferential direction of the rotor body and the surface;

(1) Install the turntable on the vertical machining center and fix the turntable on the workbench;

(2) Put the rotor body to be processed on the turntable, and ensure that the long side of the rotor body is at the 0 position and clamped;

③ Install the cutter and find the origin of the workpiece;

(4) storing the machining track program codes of the four curved surfaces of the rotor body generated in the step (4) into the memory of the machine tool, calling the current machining track program code of the 0-degree curved surface, and starting the machine tool to finish machining the 0-degree curved surface of the rotor body;

⑤ Rotate the rotor body by 90 degrees, and then call the 90-plane machining trajectory program code to complete the machining of the rotor body 90 plane, thus completing the machining of the rotor body 180 plane and the rotor body 270 plane;

(6) welding alloy and grinding; Carrying out surface butt welding alloy treatment on the rotor body obtained in the step (5), and polishing to make the surface of the rotor body smooth;

(7) Detection: the shape and volume of the rotor body obtained in step (6) are detected. The invention greatly improves the processing size of the rotor body, can accurately meet the requirements of drawing processing, and greatly improves the rubber quality of users in the rubber mixing process. In after-sales service, if replacement is needed. Because of its uniform size standard, the procurement cost of enterprises is greatly reduced. At the same time, the advanced numerical control machining method is adopted to replace the existing manual grinding process, which improves the machining quality of the rotor body, shortens the production cycle and reduces the production cost. In addition, the method of the invention is also suitable for the design, processing and manufacturing of other complex curved parts.

claim of right

1. A method for producing a rotor body of an internal mixer is characterized by comprising the following steps: (1) casting and sand cleaning; Putting the mold into a sand box for modeling, then pouring to obtain a casting blank of the rotor body, and cleaning the iron sand on the surface of the casting blank with a vibrator; ⑵ According to the size information of the long and short sides of the rotor, the rotor surface equation is established by using three-dimensional software Pro/Engineer, using space solid geometry and analytic geometry; ⑶ Establish a three-dimensional solid model. Using the rotor surface equation obtained in step ⑶ 2 and the surface command of the three-dimensional software Pro/Engineer, the three-dimensional solid model diagram of the rotor is established, and the simulated meshing animation of the rotor is made; (4) generating a machining program code; Generating a machining program code from the three-dimensional solid model diagram obtained in step (3) by using three-dimensional software Pro/Engineer and MasterCAM; (5) NC machining: the program code generated in step (4) is stored in the memory of the NC vertical machining center, and the 360-degree machining of the rotor body is completed through four indexing rotations in the circumferential direction of the surface of the rotor body; (6) welding alloy and grinding; Carrying out surface butt welding alloy treatment on the rotor body obtained in the step (5), and polishing to make the surface of the rotor body smooth; (7) Detection: the shape and volume of the rotor body obtained in step (6) are detected.

Full text abstract

The invention discloses a production method for numerically-controlled machining of a rotor body of an internal mixer, which is characterized by comprising the following steps: casting, sand cleaning, modeling, establishing a three-dimensional solid model, generating a machining program code, numerically-controlled machining, alloy welding, grinding and detection. The invention adopts numerical control technology to process the rotor body of the internal mixer, which greatly improves the processing shape and size of the rotor body, improves the processing quality of the rotor body, shortens the production cycle and reduces the production cost. Meanwhile, the invention also improves the production cost.