Abstract:
PROBLEM TO BE SOLVED: To provide a multistage reamer which prevents deterioration in the working accuracy of a hole caused by chips produced by cutting of a blade in another stage. SOLUTION: Because the injecting direction of coolant injected from a coolant hole 8b opening on the working surface 6b of a second blade 4b is set opposite to the injecting direction of coolant injected from a coolant hole 8a opening on the working surface 6a of a first blade 4a, the chips produced through cutting of a cutting edge 5b of the second blade 4b can be discharged toward the direction opposite to the tip side by the coolant injected from the coolant hole 8b opening on the working surface 6b of the second blade 4b. Thus, a flaw on a finishing surface caused with the chips, which are produced at cutting of the cutting edge 5b of the second blade 4b and enter into the gap between the adjacent first blade 4a and the finished surface finished by the first blade 4a, can be prevented, securing the required working accuracy of the hole. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a honing method in which a grinding resistance can be adjusted, and generation of chatter and grinding efficiency can be controlled without requiring cost disadvantageous large changes in an existing facility. SOLUTION: Among angles made by a direction of each abrasive grain composing a group of abrasive grains forming a grinding stone 10 being pressed against a processed surface 2 by pressing of a grinding surface 11 against the processed surface 2, and a direction of the each abrasive grain moving along a circumferential direction of the processed surface 2 by sliding of the grinding surface 11 along the processed surface 2, an angle (refer to α1max, α1min) in an opposite side of a side of the processed surface 2 and in a front side relative to the moving direction is regarded as an abrasive grain rake angle. The abrasive grain rake angle is set within a range from 0 degree to substantially 90 degrees or within a range from the substantially 90 degrees to 180 degrees in the entire grinding surface 11. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a breather plug which simplifies construction and simultaneously which can adjust internal pressure of a case by allowing only passage of air without allowing passage of foreign matter such as oil. SOLUTION: The breather plug 1 is composed of a first cylindrical body 6 which is attached to a wall portion 2a of the case 2, a second cylindrical body 9 which is screwed to a recessed portion 5 provided on the first cylindrical body 6 and an internal pressure adjustment filter 10 which is installed on the recessed portion 5 of the first cylindrical body 6 and is interposed between a first communication passage 3 of the first cylindrical body 6 and a second communication passage 7 of the second cylindrical body 9 whereby the second cylindrical body 9 is screwed on the recessed portion 5 of the first cylindrical body 6. Thus, the breather plug 1 is constituted of a reduced number of components and is simplified in construction and simultaneously enables the filter to adjust the internal pressure of the case 2 by allowing only passage of air without allowing passage of the foreign matter such as oil within the case 2 by means of the filter 10 for the internal pressure adjustment. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a lash adjuster installation structure capable of forming a passage for releasing air at the time of insertion of a lash adjuster into a lash adjuster insertion hole without producing burr. SOLUTION: A sleeve 9 is interposed between the lash adjuster installation hole 34 and the lash adjuster, and an air releasing passage 9A is formed between an outer circumference surface of the sleeve 9 and an inner circumference surface of the lash adjuster installation hole 34 by forming an air releasing groove 92 on the outer circumference surface of the sleeve 9. Consequently, air in a space formed by an inside of the sleeve 9 and a bottom surface of the lash adjuster 82 is released from an upper surface of a cylinder head 3 through the air releasing passage 9A at the time of insertion work of the lash adjuster 82. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method to grind a grinding portion favorably in precision by setting an optimum grinding condition. SOLUTION: In the grinding method, the shaft type workpiece 1 is supported by the supporting means 2 and sent relatively while being rotated. A coolant C is supplied to a contact point of the workpiece 1 and the grinding stone 3. A load on the supporting means 2 in grinding is measured by the sensor 5, and the grinding condition is detected based on the measuring value. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PURPOSE:To improve the machining precision of a work and to shorten the cycle time by always supporting the machining force of a die with the stable force from the inside of the work from beginning of form rolling until finishing. CONSTITUTION:In a form rolling device to roll the outer circumference of a hollow shaft like work 28 with a die 26, the device is provided with a fluid pouring means 30 to pour a fluid inside the work 28, a fluid sealing means 34 to seal this fluid inside the work 28, and a pressure detecting means 38 to detect the pressure of the fluid in the state of being sealed inside the work 28.
Abstract:
PROBLEM TO BE SOLVED: To mitigate stress concentration to a cut ending part of a form rolled spline and a rack end part of a die and to improve durability by setting a tooth profile of the rack end part of a flat die for form-rolling of the cut ending part of the spline in a same profile as a tooth form of the other rack part. SOLUTION: Individual rack teeth 12 formed along the longitudinal direction of die main body 10 for form-rolling of a spline or a serration are composed of a straight rack part 12a and a rack end part 12b with a curvature R. By the top part of a grindstone, the bottom of tooth of the rack tooth 12 is machined and by the bottom part of the grindstone, the top part of the racktooth 12 is machined. By traveling control of the grindstone using a three-axis controlled NC surface grinder or the like, in succession to machining of the straight rack part 12a, a rack end part 12b where the tooth profile of the same profile continues, can be formed. By one timemachining stroke by the grindstone, since the rack part 12a and the rack end part 12b are machine together, the manufacturing efficiency is excellent.
Abstract:
PURPOSE:To enable the easy chamfering of a workpiece having non-circular section by holding a cutting tool for chamfering the edge of the workpiece on a contact energized in a direction at right angles with the rotational center line of the workpiece, and mounting the contact having the workpiece onto a general purpose machine tool. CONSTITUTION:The cutting edge 114 of a tip 106 is caused to come in contact with both edges 18 of a cam 11, and a support seat 20 is made to come near the camshaft 10. As a result, arms 100 are separated from each other against the energizing force of springs 120, and the external surface of a roller 40 comes in contact with the external surface 14 of the camshaft 10. Thereafter, when the camshaft 10 is rotated, the tip 106 begins to chamfer the edges 18 of the cam 11. As the cam 11 is of non-circular form, the roller 40 moves in a direction orthogonal with the rotational center line 2 of the camshaft 10, due to the rotation thereof. The roller 40, however, copies the external surface 14 of the cam 11. Consequently, the tip 106 also copies the aforesaid surface 14 and machines the edges 18, together with the contact 34.