scholarly journals Preparation and performance of tannin-glyoxal-urea resin-bonded grinding wheel loaded with SiO2 reinforcing particles

2021 ◽  
Vol 23 ◽  
Author(s):  
Jun Zhang ◽  
Bowen Liu ◽  
Yunxia Zhou ◽  
Hisham Essawy ◽  
Jinxin Li ◽  
...  
Keyword(s):  
Grinding Wheel ◽  
Reinforcing Particles ◽  
And Performance

scholarly journals Welfare and Performance of Three Turkey Breeds—Comparison between Infrared Beak Treatment and Natural Beak Abrasion by Pecking on a Screed Grinding Wheel

Animals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2395
Author(s):  
Stefanie Grün ◽  
Klaus Damme ◽  
Matthias Müller ◽  
Marie Franziska Sommer ◽  
Paul Schmidt ◽  
...  
Keyword(s):  
Animal Welfare ◽  
Behavioral Disorders ◽  
The Other ◽  
Grinding Wheel ◽  
Treatment Combination ◽  
Feather Pecking ◽  
Economic Problems ◽  
And Performance ◽  
Beak Trimming

Feather pecking and cannibalism are behavioral disorders that cause animal-welfare-relevant and economic problems. To mitigate these problems, the beaks of conventionally reared turkeys are usually already trimmed in the hatcheries. To find an alternative to beak trimming, we conducted this study with male turkeys of three breeds: B.U.T. 6, B.U.T. Premium and, Auburn (200 turkeys per breed). Half of the birds had infrared-trimmed beaks; the other half had intact beaks. For each treatment combination (breed, beak status), 25 turkeys were housed in one section. A screed grinding wheel was installed in each feed pan of the non-beak-trimmed turkeys as of week six to facilitate natural beak abrasion until slaughter. Eight randomly selected turkeys per section were regularly examined to record injuries, plumage condition, and beak dimensions. In addition, 96 beaks from randomly slaughtered birds were examined macroscopically and histologically. The results concerning injuries and plumage condition showed in most cases no differences between the beak-trimmed turkeys and the ones provided with the blunting disks. The histological examinations revealed alterations in only the beak-trimmed birds. We can conclude that the blunting method smoothens the beak during feeding and thus may be a possible alternative to beak trimming.

Preparation and performance of resin-bonded grinding wheel with braze-coated diamond grits

2020 ◽  
Vol 101 ◽  
pp. 107619 ◽  
Author(s):  
Ming-cong Li ◽  
Feng-lin Zhang ◽  
Yu-mei Zhou ◽  
Wei-xiong Li ◽  
Shixiong Wu ◽  
...  
Keyword(s):  
Grinding Wheel ◽  
And Performance

Formulating bioplastic composites for biodegradability, recycling, and performance: A Review

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 2021-2083
Author(s):  
Martin A. Hubbe ◽  
Nathalie Lavoine ◽  
Lucian A. Lucia ◽  
Chang Dou
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Plant Materials ◽  
Neat Polymer ◽  
Reinforcing Particles ◽  
And Performance ◽  
Processing Steps ◽  
Rate Controlling Step

Society’s wish list for future packaging systems is placing some daunting challenges upon researchers: In addition to protecting contents during storage and shipping, the material must not bio-accumulate, and it should be readily recyclable by using practical processing steps. This article considers strategies employing bio-based plastics and reviews published information relative to their performance. Though bioplastics such as poly(lactic acid) (PLA) and poly(hydroxybutyrate) (PHB) can be prepared from plant materials, their default properties are generally inferior to those of popular synthetic plastics. In addition, some bioplastics are not easily decomposed in soil or seawater, and the polymers can undergo chemical breakdown during recycling. This review considers strategies to overcome such challenges, including the use of biodegradable cellulose-based reinforcing particles. In addition to contributing to strength, the cellulose can swell the bioplastic, allowing enzymatic attack. The rate-controlling step in bioplastic degradation also can be abiotic, i.e. not involving enzymes. Though there is much more work to be done, much progress has been achieved in formulating bioplastic composites that are biodegradable, recyclable, and higher in strength compared to the neat polymer. Emphasis in this review is placed on PLA and PHB, but not to the exclusion of other bioplastic matrix materials.

Study on Forming Mechanism of Surface Hardening in Two-Pass Grinding 40Cr Steel

2006 ◽  
Vol 304-305 ◽  
pp. 588-592 ◽  
Author(s):  
Gui Cheng Wang ◽  
Ju Dong Liu ◽  
Hong Jie Pei ◽  
Z.H. Jia ◽  
Li Jie Ma
Keyword(s):  
Hardened Layer ◽  
Grinding Wheel ◽  
Forming Mechanism ◽  
Creep Feed ◽  
Grind Hardening ◽  
Quenched Steel ◽  
And Performance ◽  
Grinding Temperature Field ◽  
40Cr Steel ◽  
Martensite Structure

We had done the two-pass grind-hardening experiment on 40Cr steel using the conventional aluminum grinding wheel on a surface grinder, compared the structure and performance of the hardened layer of one-pass grinding with those of two-pass grinding and analyzed the forming mechanism of two-pass grinding hardened layers. The results show that there are a similar martensite structure and change rules of hardened layer of one-pass grinding and two-pass grinding in spite of the different of initial structures, for martensite has tempered by the action of the creep feed grinding temperature field. The depths of hardened layer, microhardness and wear resistance have further improved, but the maximal compressive residual stress and its influencing depth of hardened layer have decreased. The forming mechanism of the two-pass grinding hardened layer is the same as that of the grinding hardened layer of quenched steel.

Microstructure and Performance of Porous Ni-Cr Alloy Bonded Diamond Grinding Wheel

2006 ◽  
Vol 532-533 ◽  
pp. 373-376 ◽  
Author(s):  
Hong Hua Su ◽  
Hong Jun Xu ◽  
Bing Xiao ◽  
Yu Can Fu ◽  
Jiu Hua Xu
Keyword(s):  
Surface Roughness ◽  
Porous Metal ◽  
Grinding Wheel ◽  
Past Study ◽  
Machining Performance ◽  
Diamond Grinding Wheel ◽  
Diamond Grinding ◽  
Grinding Ratio ◽  
Powder Sintering ◽  
And Performance

Although the porous metal bonded diamond grinding wheel, which has recently been developed, had an excellent grinding performance for hard-brittle materials, its applications were only in precision grinding in past study. A new method for fabricating the new porous metal bonded diamond grinding wheel by Ni-Cr alloy as bond and vacuum loose powder sintering was proposed in this paper. The morphology of cross section of the segments and microstructure of interface between diamond grits and bond were analyzed. The wetting mechanism between Ni-Cr alloy bond and diamond is reacting wetting. Machining performance experiments about grinding ratio and surface roughness have been carried out. The testing results show that the porous Ni-Cr alloy bonded diamond grinding wheel has certainly fine machining performance in high grinding force occasion, and the maximal grinding ratio and best surface roughness were 6660 and 1.08 m, respectively.

Remote-Controlled Inspection Robot for Nuclear Facilities in Underwater Environment

2002 ◽  
Author(s):  
Yasuhiro Miwa ◽  
Syuichi Satoh ◽  
Naoya Hirose
Keyword(s):  
Nuclear Power ◽  
Power Plants ◽  
Grinding Wheel ◽  
Nuclear Facilities ◽  
Inspection Robot ◽  
Inspection Process ◽  
Removal Technologies ◽  
And Performance ◽  
Set Up ◽  
High Level

A remote-controlled inspection robot for nuclear facilities was developed. This is a underwater robot technology combined with inspection and flaw removal technologies. This report will describe the structure and performance of this robot. The inspection robot consists of two parts. The one is driving equipment, and the other is inspection and grinding units. It can swim in the tank, move around the tank wall, and stay on the inspection area. After that it starts inspection and flaw removal with a special grinding wheel. This technology had been developed to inspect some Radioactive Waste (RW) tanks in operating nuclear power plants. There are many RW tanks in these plants, which human workers can be hard to access because of a high level dose. This technology is too useful for inspection works of human-inaccessible areas. And also, in conventional inspection process, some worker go into the tank and set up scaffolding after full drainage and decontamination. It spends too much time for these preparations. If tank inspection and flaw removal can be performed in underwater, the outage period will be reduced. Remote-controlled process can be performed in underwater. This is the great advantage for plant owners. Since 1999 we have been applying this inspection robot to operating nuclear 11 facilities in Japan.

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