【摘要】：釬焊金剛石工具的性能優(yōu)勢已被近年的研究所證明,相比燒結(jié)和電鍍工藝,釬焊后磨粒結(jié)合強(qiáng)度高,這一特征使得磨粒出露較高,容屑空間較大成為可能,因此釬焊金剛石工具具有其他工藝下金剛石工具無可比擬的優(yōu)勢:較高的加工效率、較長的使用壽命、較高的磨料的利用率等[1-6]。目前工業(yè)生產(chǎn)中對釬焊金剛石工具的需求不斷擴(kuò)大,但是很少有單位能夠?qū)⒔饎偸ぞ叩闹苽溥M(jìn)行產(chǎn)業(yè)化的,因此提高釬焊金剛石工具的生產(chǎn)效率就成為了一個(gè)重要的課題。本文針對這一市場需求,對比分析已經(jīng)成熟應(yīng)用于批量生產(chǎn)的釬焊金剛石工具的真空釬焊工藝,提出利用網(wǎng)帶連續(xù)式隧道釬焊生產(chǎn)線進(jìn)行釬焊金剛石孔鉆的規(guī)�；a(chǎn),圍繞網(wǎng)帶爐的加熱工藝(如各區(qū)加熱溫度,網(wǎng)帶速度等),對釬焊金剛石工具微觀組織和切削性能的影響機(jī)理開展了深入的基礎(chǔ)研究工作。本文的爐中釬焊試驗(yàn)是在宿遷某工具公司完成的,以該設(shè)備日常對小尺寸工件進(jìn)行熱處理的網(wǎng)帶速度為試驗(yàn)中的網(wǎng)帶速度,根據(jù)釬料和金剛石的特性,設(shè)計(jì)8組對應(yīng)不同工藝參數(shù)的試驗(yàn),并使用熱電偶測量其中一組試驗(yàn)中釬焊區(qū)域表面某點(diǎn)在釬焊過程中的溫度曲線。隨后對各組實(shí)驗(yàn)獲得的試樣進(jìn)行金相組織觀察以及加工性能試驗(yàn),分析釬焊工藝參數(shù)的變化對釬焊質(zhì)量的影響。最后結(jié)果表明當(dāng)網(wǎng)帶速度為110mm/min時(shí),釬焊溫度為1080℃左右時(shí),所獲得的釬焊金剛石孔鉆的釬焊質(zhì)量高,加工性能好。本文研究網(wǎng)帶爐連續(xù)釬焊工藝的方法是實(shí)驗(yàn)與數(shù)值模擬相結(jié)合。通過分析網(wǎng)帶爐釬焊金剛石工具的工藝條件,排除一些次要影響因素,建立起釬焊金剛石孔鉆爐中釬焊的三維傳熱模型,然后在ANSYS中,計(jì)算出該模型中,與實(shí)測點(diǎn)相同位置的熱循環(huán)曲線,對比分析實(shí)測溫度曲線與模擬出的溫度曲線,根據(jù)吻合情況不斷優(yōu)化建立的數(shù)值模型,直至兩條曲線能夠很好的吻合。最后運(yùn)用該模型仿真試樣在八組工藝下的八條熱循環(huán)曲線,對比分析溫度曲線反應(yīng)的加熱工藝,結(jié)合加工性能試驗(yàn)和微觀形貌的觀察,分析性能差異的原因。在上述基礎(chǔ)上,結(jié)合運(yùn)用仿真和試驗(yàn),尋求效率更高的工藝參數(shù)(更快的網(wǎng)帶速率,更高的各區(qū)溫度)。本文還通過對比分析真空爐釬焊孔鉆和網(wǎng)帶爐釬焊孔鉆,探討了網(wǎng)帶爐釬焊工藝對金剛石工具微觀組織和加工性能的影響。
[Abstract]:The advantages of brazing diamond tools have been proved in recent years. Compared with sintering and electroplating technology, the bonding strength of brazed diamond particles is higher, which makes it possible that the abrasive particles have higher exposure and larger chip-holding space. Therefore, brazing diamond tools have unparalleled advantages over other diamond tools under other processes: higher processing efficiency, longer service life and higher abrasive utilization ratio [1-6]. At present, the demand for brazing diamond tools in industrial production is expanding, but few units can industrialize the preparation of diamond tools. Therefore, improving the production efficiency of brazed diamond tools has become an important issue. In view of this market demand, this paper contrasts and analyzes the vacuum brazing technology of brazing diamond tools which have been used in batch production, and puts forward the large-scale production of brazing diamond hole drill by using the mesh belt continuous tunnel brazing production line. Around the heating process of the mesh belt furnace (such as the heating temperature of each zone, the speed of the mesh belt, etc.), the influence mechanism of microstructure and cutting performance of brazing diamond tools has been studied deeply. The brazing test in the furnace of this paper was completed in Suqian tool Company. According to the characteristics of brazing metal and diamond, the speed of the mesh strip of the equipment for daily heat treatment of small size workpiece was taken as the speed of the test. Eight groups of experiments corresponding to different process parameters were designed, and the temperature curves of a point on the surface of the brazed area during the brazing process were measured by thermocouple in one of the tests. Then the microstructure and processing properties of the samples obtained from each group of experiments were observed and the influence of the parameters of brazing process on the quality of brazing was analyzed. The results show that when the mesh speed is 110mm/min and the brazing temperature is about 1080 鈩，

本文編號(hào)：2215312