This page contains a Flash digital edition of a book.
sions. As noted above, improved tooling and grinding wheels have made some processes economical only recently. Other techniques seem truly revolutionary and Yoders believes now is the time for automotive to consider them. One example is lightweighting. “In recent years, to reduce weight, manufacturers have reduced the face width of their transmission gears,” he said. This makes the chamfer on the teeth ends, that runs the length of the involute, especially critical as manufacturers reduce the width of the face. The common way of producing that chamfer was to plastically deform the sharp edge with a roll/press process. “A better way to engineer that chamfer is through cutting, but that can eat into cycle time without the right process. Lost seconds are real money in automotive,” he said. Starting in 2014, Liebherr began offering a method of both hobbing and precisely cutting the end relief chamfer simultaneously while roughing the gear tooth. Offered on the LC ChamferCut series of machines, Yoders describes this as a parallel operation. “We believe it is fi ve times cheaper than the roll/press method when all tooling and expenses are


included,” he said. He noted that the method was developed in conjunction with LMT-Fette, with its ChamferCut tooling solu- tion, highlighting the need for a cutting tool that can keep up with machine speeds.


Fuel Economy with Better NVH While engineered chamfers are important for weight, Liebherr has also developed a new gear grinding technology that improves fuel economy and NVH directly. Gear manufac- turers are increasingly designing asymmetric gear teeth—dif- ferent pressure angles from left-fl ank to right-fl ank. To the layman’s eye, these appear to be misshapen examples of gears, but in fact account for different loadings in power transmission on one fl ank of a tooth compared to the other; drive-fl ank compared to coast-fl ank. “This increases load carrying capacity while reducing NVH,” said Yoders. The challenge, according to him, was developing a gen- erating grinding process that specifi cally addressed dressing of the grinding worm and the complex machine movements


Marposs Tool Monitoring Solutions Increase hob life 40-60%


Safeguard your hobs and maximize tool life based on real tool condition data.


while protecting from costly damage.


Developed specifically for gear cutting using Artis technology.


www.marposs.com/gearcutting 248-364-2734 or 1-888-627-7677


See us at AMERIMOLD and IMTS 2016 May 2016 | AdvancedManufacturing.org 65


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92  |  Page 93  |  Page 94  |  Page 95  |  Page 96  |  Page 97  |  Page 98  |  Page 99  |  Page 100  |  Page 101  |  Page 102  |  Page 103  |  Page 104  |  Page 105  |  Page 106  |  Page 107  |  Page 108  |  Page 109  |  Page 110  |  Page 111  |  Page 112  |  Page 113  |  Page 114  |  Page 115  |  Page 116  |  Page 117  |  Page 118  |  Page 119  |  Page 120  |  Page 121  |  Page 122  |  Page 123  |  Page 124  |  Page 125  |  Page 126  |  Page 127  |  Page 128  |  Page 129  |  Page 130  |  Page 131  |  Page 132  |  Page 133  |  Page 134  |  Page 135  |  Page 136  |  Page 137  |  Page 138  |  Page 139  |  Page 140  |  Page 141  |  Page 142  |  Page 143  |  Page 144  |  Page 145  |  Page 146  |  Page 147  |  Page 148  |  Page 149  |  Page 150