摘要:
A honeycomb structure includes a plurality of honeycomb segments each having a polygonal cross section with an adhesive agent interposed between each two honeycomb segments, the plurality of honeycomb segments each having a plurality of channels which are partitioned from one another by porous partition walls, the plurality of channels penetrating through the honeycomb segment in a uniaxial direction. The plurality of honeycomb segments are arrayed in a way that adhesive agent-applied surfaces and adhesive agent-unapplied surfaces respectively of the plurality of honeycomb segments are arranged alternately along bonded lines each joining bonded surfaces respectively of abutting honeycomb segments. In each of the honeycomb segments, an adhesive agent is applied to at least one side surface, and the honeycomb segments and at least one honeycomb segment, in each of which the adhesive agent is applied to no side surface.
摘要:
A servo motor controlling method includes: directly or indirectly detecting a position of a moving body which performs a circular-arc interpolation feeding motion by a servo motor; performing a feedback control for enabling the position of the moving body to comply with a position command; and at a quadrant changing time when a moving direction of the moving body is changed, performing torque correction on a torque command value according to a distance from a position where the moving direction is changed. By this method, a quadrant protrusion and a torque change with respect to a friction caused from a free zone at a time of reversion of a ball screw can be appropriately corrected. Especially, by performing a first torque correction for a static friction at the position where the moving direction is changed, and by performing a second torque correction for a moving friction after movement by the distance corresponding to the free zone, more appropriate correction can be obtained.
摘要:
Disclosed herein is a moisture-reactive composition having a moisture-reactive polysiloxane having a main chain and one or more side chains, wherein the main chain and/or the one or more side chains has a group represented by the formula: —MXmYn; and wherein M is selected from the group consisting of a multivalent metal atom, B, and P═O; X is a hydrogen atom, a substituted or nonsubstituted alkyl, alkenyl or alkoxy group; Y is a substituted or nonsubstituted alkoxy, siloxy, carboxyl, or diketolate group; m is from 1 to 3; and n is from 0 to 2.
摘要:
There is disclosed a sealing material for sealing a ceramic structure, the sealing material containing a ceramic component, an ordinary-temperature liquid component, and a suspending agent. In a method in which opening end portions of a large number of through channels 3 divided by partition walls 2 and extending in an axial direction in a honeycomb structure 1 including the through channels, the method comprises the steps of: sealing the opening end portions using the above-described sealing material. Sealed portions 10 are formed in the opening end portions of the through channels 3 by the sealing material. There are disclosed a sealing material, a sealing method for a honeycomb structure, and a sealed honeycomb structure in which less kinks are generated in the sealed portions, and a depth in each sealed portion fluctuates little.
摘要:
When driving a plurality of paralleled feed drive mechanisms individually by servo motors (105, 106), torque of the servo motors (105, 106) is detected, and in dependence on a difference therebetween, a position command of servo motor (106) at a slave side is corrected, so that torque of the slave side servo motor (106) is matched to to torque of servo motor (105) at a master side.
摘要:
A feed velocity of a control axis and acceleration thereof do not exceed a maximum feed velocity and a maximum acceleration defined in mechanical specifications even if a radial operation is carried out for the purpose of a cut-in or escape operation in a contour describing control. A radial permissible maximum velocity (Vnp) and a radial permissible maximum acceleration (&agr;np) in a contour describing control using a circular interpolation is set separately from a setting value of a maximum feed velocity (Vm) of a control axis and that of a maximum acceleration (&agr;m) thereof set as mechanical specifications, and when a command of the circular interpolation is given, limitations are given to a radial velocity (Vn) and acceleration (&agr;n) so that the radial velocity (Vn) and acceleration (&agr;n) do not exceed the radial permissible maximum velocity (Vnp) and permissible maximum acceleration (&agr;np).
摘要:
The invention relates to a numerical controlling unit that includes: a instructing part that provides a command acceleration for a servomotor, a parameter storing part that stores a threshold parameter about a load of the servomotor, and a load measuring part that measures the load of the servomotor. The load measured by the load measuring part and the threshold parameter are compared by a load comparing part, and an acceleration adjusting part changes the command acceleration for the servomotor based on a result compared by the load comparing part. A controlling part controls the servomotor based on the changed command acceleration. According to the invention, the command acceleration for the servomotor is suitably changed based on the result of comparing the load measured by the load measuring part and the threshold parameter. Thus, it can be prevented that the servomotor is subjected to an overload while using the maximum performance in feeding a work piece.
摘要:
A numeric control device of a turning mechanism which turns a turning body from a driving source which circularly moves through a non-linear transmitting mechanism has a coordinate transformation device outputting a signal which converts an inputted turning angular signal into a position of the driving source, and a compensator outputting a signal which is derived from computing a positional error of the driving source in accordance with the turning angular signal, and the control of the driving source is carried out by a servo-input signal which is derived from the sum of a conversion signal outputted from the coordinate transformation device and a compensation signal outputted from the compensator. Since the numerical control mechanism of the present invention controls the driving source with addition of the compensation signal, it becomes possible to stabilize the turning velocity of the turning body with high accuracy.
摘要:
A numerical controller controls a machine tool to achieve a tapping operation with high accuracy and satisfactory quality without being constrained by a set axial feed distance and a specified axial feed speed. An analyzing unit (4B) calculates a minimum axial feed distance (L.sub.min) necessary for securing a constant machining program set in an input unit (7). A speed pattern adjusting unit (4C) modifies the axial feed speed pattern so that the constant speed time (T) can be secured. An(??) distributing unit (4A) determines drive instructions for a synchronous tapping operation. A drive control unit (5) gives the drive instructions to servomotors included in a driving unit (3).
摘要:
Letting a differential value of a command value of a position command to a position control loop be an input variable, a feed forward compensation value is calculated depending on the input variable and a combination of a proper vibration frequency and an attenuation constant of a vibration in a moving direction of a moving mechanism to be set in a parameter setting manner, and a feed forward compensation is effected for the command value of the position command to the position control loop by the feed forward compensation value.