The automatic cycle of the machine tool. Thereby reducing the labor intensity of workers and improving product quality and productivity.

The inner channel of the outer ring of HQ2 of our factory (the 2?R2.89 shown) is ground on the 3MZ146 internal grinding machine. However, due to the limitations of the machine tool itself, the grinding efficiency is very low and the labor intensity of the workers is large. In order to gain time and save money, we have modified the original machine tools to improve the efficiency of production.

1 Determine the design scheme through the self-solving found that the original grinding machine can only grind one channel at a time, and our product (see) has two channels. Thus, grinding a part must first grind a channel, then the operator manually adds a groove block that controls the distance between the two grooves, and then grinds another channel, so that the grinding machine cannot achieve full-automatic circulation. In response to these problems, the grinding machine is transformed into 419. The frequency converter of the inverter heat sink is not changed in the bellows of the spinning frame, and the quality of the yarn is reduced. The rated speed of the motor is 50Hz. Frequency, Hz; The following formula can be derived for converting the set spindle speed into the inverter output frequency in programming: 4 Main features of the system 4.1 Using the touch screen as the display screen, the operation is simple, the data input, review and modification are convenient, and the operation The speed is increased, the touch screen display area is large, the amount of information is large, and the fault diagnosis and operation prompts can be configured, and the graphic display is supported.

4.2 Communication control improves control accuracy, high reliability, strong anti-interference ability, and low hardware investment.

4.3 Programming application parameters are written into EEPROM technology, and the data can be saved permanently. The use of the spinning machine's own resources to enhance the heat dissipation of the inverter to prevent the expansion of the flying flower to adapt to the harsh environment of the spinning workshop; 4.5 replace the travel switch with a sensor, the contact switch is non-contact, the reliability is improved, the adjustment is simpler and the life of the component is improved. .

In the structure that determines the position of the peach wheel, the program is programmed to acquire three position signals with two sensors, saving costs.

5 Application effect From the user's use, the car runs stably, has high reliability, is easy to operate, and has good yarn quality. The main effect is as follows: the yarn breakage rate is greatly reduced; it is more convenient when changing the yarn type; there is no need to directly operate the inverter, the inverter malfunction or parameter setting will not occur; the speed control accuracy is higher, and no Speed ​​regulation, by using different spindle speeds in different operating stages of small yarn, medium yarn and large yarn, the machine working efficiency can be maximized without exceeding the allowable range of mechanical properties and ensuring yarn quality; installation on the spinning frame The slub yarn device, through the setting of the curve slope, enables the starting and stopping speed of the main machine and the slub yarn device to be perfectly matched. Without the load, the yarn is ground at the same time with two grinding wheels. The wheel dresser is trimmed from the original single point to a two-point dressing. The grinding machine is fully automated.

The first method 2.1 determines the grinding head power double groove simultaneous grinding compared with the single grinding only groove, the grinding force is multiplied, the power of the original grinding machine grinding head can not meet the requirements, the grinding head power must be re-determined. Due to the complexity of the grinding process, many factors affect the grinding force, we use. The post length is the minimum allowed for the grinder. The material is selected as 20Cr. Below, the rigidity of the post is checked.

The pole is rigid enough. Therefore, it is sufficient to check the rigidity of the post when rough grinding. It can be seen that the radius of curvature of the two grooves is 0.03 mm, and the diameter tolerance of the two grooves is only 0.01 mm. Therefore, the maximum deformation of the post must be within 0.03 mm, and the difference between the deformation points of the two grinding points Can not exceed 0.005mm, in order to ensure the grinding efficiency, the processed workpiece is qualified.

The post can be simplified to correspond to A, B, C, O in the cantilever beam (see). Select the coordinate system as shown in (a) and (b) respectively. The bending moment on any section is M=?F(l?x) and integrate EIv'. When x=grinding force F=nP real X102/v actual grinding Cutting power P = 1.759kW grinding head efficiency n = 0.8 grinding wheel linear velocity v = 46m / s F = 3.12kgf from the cross section of the known cross section A is required to shorten the initial grinding phase and the stabilization phase time a, so you must ensure that FishingH Generation: Into the above formula, n is the amount of deformation at A caused by I. The deformation amount of A caused by F2 for iki.net is fA2=0.0001mm According to the superposition principle, the total deformation amount at A is as follows: Vc total = VC + Va, Vb total = Vi, + Va is convenient for calculation. Another coordinate system is set up, such as (b), with point A as the origin. From the above formula, Vci=?0. It can be known that I need to replace the groove block.

It can be seen that the groove block 3 and the piston rod 5 are looped together in the form of a T-shaped groove. When replacing, it is only necessary to lift the groove block upwards, which is very convenient. This greatly shortens the auxiliary time when the machine is refurbished. This device lays the foundation for a fully automatic cycle of machine tools.

2.4 Hydraulic system transformation In order to realize the double-point dressing of the grinding wheel and the automatic advance and retreat of the groove block, the hydraulic circuit has been improved as follows: the two-position four-way valve that controls the advance and retreat of the grinding frame is changed into a three-position four-way valve to make the grinding The frame can be stopped at any position; the two-position four-way valve that controls the movement of the groove is added.

The cylinder of the cylinder that advances and retreats by the groove is small, and the advance and retreat movement of the groove is performed separately, so the flow rate of the original hydraulic system can meet the requirements of the transformation and does not need to be changed.

2.5 Design action cycle before and after the transformation of the action see Table 1. The change in efficiency can be seen from Table 1.

Table 1 before and after the transformation of the transformation before the transformation before the transformation, manual loading and unloading, automatic loading and unloading of the grinding frame into the grinding frame into the coarse grinding, a groove, coarse grinding, retreating, the distance, the block, the grinding wheel, the grinding frame, the grinding frame, the first grinding wheel, the grinding machine Gully distance from the block retraction frame to the second trimming position manually into the groove to repair the second piece of grinding wheel to repeat the above action grinding another ditch grinding frame into the fine grinding 3 conclusions of the community 40% of the first editor. Mechanical Design Manual (4th Edition) Beijing: Chemical Industry 2.3 Designing the groove distance block automatic advance and retreat device In order to realize the grinding wheel dresser two points to trim two grinding wheels respectively, a set of groove distance block automatic advance and retreat device is specially designed (see). The length dimension L of the groove block 3 is consistent with the groove distance of the product, and is automatically advanced and retracted by the cylinder 6, and the rear positioning block 4 realizes the axial positioning during the dressing of the wheel. The ram 7 is fixed to the grinding frame. When the grinding wheel is trimmed, the groove block 3 is first in the advanced position (illustrated position), the grinding frame is moved to the first trimming position, and the ram 7 is placed against the block block 3 to be positioned behind the positioning block 4, and the dresser is trimmed first. Piece grinding wheel. After trimming the first grinding wheel, the groove distance block is retracted, the grinding frame is moved to the second trimming position, the top rod 7 directly bears against the rear positioning block 4, and the trimmer trims the second grinding wheel. In this way, the arc center distance of the two-side grinding wheel after trimming and the groove distance of the product are ensured. After the grinding machine is modified, the processed products completely meet the design requirements, and the influence of human factors is eliminated, and the stability of the product quality is achieved. Also improved. More importantly, the production efficiency has been improved, from 200 units in the original class to 450 units in the current class. The cost of the renovation is about 10,000 yuan. Completely achieved the intended purpose.

(Finish)

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