WO2018112909A1 - 硬质合金钻头金刚石涂层预处理方法 - Google Patents
硬质合金钻头金刚石涂层预处理方法 Download PDFInfo
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- WO2018112909A1 WO2018112909A1 PCT/CN2016/111779 CN2016111779W WO2018112909A1 WO 2018112909 A1 WO2018112909 A1 WO 2018112909A1 CN 2016111779 W CN2016111779 W CN 2016111779W WO 2018112909 A1 WO2018112909 A1 WO 2018112909A1
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- drill bit
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/02—Pretreatment of the material to be coated
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
Definitions
- the invention belongs to the technical field of cemented carbide drill bits, and in particular relates to a method for pretreating a diamond coating of a cemented carbide drill bit.
- Diamond is considered to be an ideal tool coating material due to its high hardness, high wear resistance, low coefficient of friction, low coefficient of thermal expansion, and high thermal conductivity.
- diamond coated tools are in non-ferrous metals, carbon fiber reinforced plastics (CFRP), glass fiber reinforced plastics (GFRP), and fiber reinforced metals. (FRM) and the application of new materials such as graphite and ceramics are becoming more and more widely used.
- diamond and cemented carbide have great differences in thermal expansion coefficient, elastic modulus, chemical and atomic structure, especially in the presence of binder phase Co in cemented carbide matrix, it not only reduces the nucleation rate of diamond. And promote the formation of non-diamond carbon material at the interface between the coating and the substrate, seriously affecting the quality of the diamond coating and its bonding with the substrate.
- acid-base erosion of the surface of the cemented carbide is currently performed to eliminate or reduce the negative influence of Co.
- the method is widely used because it is simple, inexpensive, and suitable for mass production. This method eliminates the influence of Co and has a negative influence on the strength of the tool base. Especially for the micro-diameter tool, the phenomenon of easy breaking of the knife is caused by the reduction of the strength of the Co-coupling treatment.
- the object of the present invention is to overcome the deficiencies of the prior art described above, and to provide a diamond alloy coating pretreatment method for a cemented carbide drill bit, which overcomes the adverse effect of the Co removal treatment on the strength of the tool base and ensures the diamond coating.
- the layer has a good bonding force with the substrate without affecting the processing properties of the drill bit.
- the technical solution of the present invention is: a method for pretreating a diamond coating of a cemented carbide drill bit, comprising the following steps:
- de-Co chemical pretreatment of the drill bit includes:
- the etched portion when the WC phase of the drill bit is etched by the alkali solution, the etched portion has a blade edge and the relationship between the length A of the tool tip and the length L of the drill bit groove satisfies L1/10 ⁇ A ⁇ L9/10;
- the etched portion When the Co phase of the drill is corroded by the acid solution, the etched portion has a blade edge and the relationship between the length A of the tool tip and the length L of the bit groove satisfies L1/10 ⁇ A ⁇ L9/10.
- the etched portion has a blade edge and the relationship between the length A of the tool tip and the length L of the drill bit groove satisfies L/5 ⁇ A ⁇ L/2.
- the etched portion has a blade edge and the relationship between the length A of the tool tip and the length L of the bit groove satisfies L/5 ⁇ A ⁇ L/2.
- cleaning the drill bit surface includes the steps of cleaning the drill bit with high purity alcohol and ultrasonic waves.
- the cleaning time is not less than 3 minutes.
- the etched portion when the WC phase of the drill bit is etched by the lye, the etched portion has a blade tip and the relationship between the length A of the tool tip and the length L of the bit groove satisfies L/3 ⁇ A ⁇ L/2;
- the etched portion When the Co phase of the drill bit is corroded by the acid solution, the etched portion has a blade edge and the relationship between the length A of the tool tip and the length L of the bit groove satisfies L/3 ⁇ A ⁇ L/2.
- the invention provides a method for pretreating a diamond coating of a cemented carbide drill bit, which not only overcomes the adverse effect of the de-Co treatment on the strength of the tool base, but also ensures a good bonding force between the diamond coating and the substrate, and at the same time Does not affect the processing performance of the drill bit.
- 1 is a schematic view showing the relationship between the length A of the drill tip and the length L of the drill bit, and the etching position in the diamond coating pretreatment method of the cemented carbide drill bit according to the embodiment of the present invention.
- left, right, upper, lower, and the like orientations in the embodiments of the present invention are merely relative concepts or referenced to the normal use state of the product, and should not be considered as limiting. .
- a cemented carbide drill bit diamond coating pretreatment method provided by an embodiment of the present invention.
- the method is characterized in that it comprises the following steps:
- de-Co chemical pretreatment of the drill bit includes:
- the etched (corroded) portion is such that the distance between the length A of the cutter tip and the length L of the drill bit is satisfied by the blade edge of the drill bit and the distance L of the drill bit is satisfied to satisfy L1/10 ⁇ A ⁇ L9/10 That is, the length of the drill blade portion is L, and the length A of the etching portion is greater than one tenth of L and less than nine tenths of an inch L; the length of the L is provided with a spiral groove, and the length of the A is a corrosion region.
- the etched portion When the Co phase of the drill bit is corroded by the acid solution, the etched portion has the tip of the drill blade and the relationship between the length A of the tool tip and the length L of the drill bit groove satisfies L1/10 ⁇ A ⁇ L9/10, that is, the bit of the drill bit
- the length is L
- the length A of the etched portion is greater than one tenth of an inch and less than nine tenths of an inch.
- the Co phase of the bit is corroded with acid and the lye corrodes the WC phase of the bit with the same length.
- the length of the etch is not more than nine tenths of the length of the bit and not less than one tenth of the length of the bit.
- the etched portion is the tip of the drill blade and the distance
- the relationship between the length A of the cutting edge and the length L of the drill bit groove satisfies L/6 ⁇ A ⁇ L4/5, that is, the length of the etched portion l is not more than four-fifths of the length of the drill blade and is not less than the length of the drill blade One sixth of the time.
- the etched portion When the Co phase of the drill bit is corroded by the acid solution, the etched portion has the tip of the drill blade and the relationship between the length A of the cutter tip and the length L of the drill bit groove satisfies L/6 ⁇ A ⁇ L4/5, that is, the etched portion
- the length of l is not more than four-fifths of the length of the drill blade and is not less than one-sixth of the length of the drill blade.
- the etched portion when the WC phase of the drill bit is etched by the alkali solution, the etched portion has a blade edge and the relationship between the length A of the tool tip and the length L of the drill bit groove satisfies L/5 ⁇ A ⁇ L2 / 3, that is, The length of the etched portion l is not more than two-thirds of the length of the drill blade and not less than one-fifth of the length of the drill blade; when the Co phase of the drill bit is corroded by acid, the etched portion is the tip of the drill blade And the relationship between the length A of the tool tip and the length L of the drill bit groove satisfies L/5 ⁇ A ⁇ L2 / 3, that is, the length of the etched portion l is not more than two-thirds of the length of the drill blade and is not less than the blade edge of the drill. One-fifth of the length.
- the etched portion when the WC phase of the drill bit is etched by the alkali solution, the etched portion has a blade edge and the relationship between the length A of the tool tip and the length L of the drill bit groove satisfies L/5 ⁇ A ⁇ L/2, That is, the length of the etched portion l is not more than one-half of the length of the drill blade and not less than one-fifth of the length of the drill blade; when the Co phase of the drill bit is corroded by the acid solution, the etched portion is the blade of the drill blade The relationship between the tip length and the length A of the tool tip and the length L of the drill bit groove satisfies L/5 ⁇ A ⁇ L/2, that is, the length of the etched portion l is not more than one-half of the length of the drill blade and is not less than the drill bit One-fifth of the length of the department.
- the etched portion is such that the edge of the drill bit includes the cutting edge and the relationship between the length A of the cutting edge and the length L of the drill bit groove satisfies L/3 ⁇ A ⁇ L/2.
- the length is not more than one-half of the length of the drill blade and not less than one-third of the length of the drill blade; when the Co phase of the drill bit is corroded by acid, the etched portion is the tip of the drill with the tip and the distance from the tip.
- the relationship between the length A and the length L of the drill bit groove satisfies L/3 ⁇ A ⁇ L/2, that is, the length of the etched portion 1 is not more than one-half of the length of the drill blade portion and is not less than three minutes of the length of the drill blade portion.
- cleaning the drill bit surface includes the steps of cleaning the drill bit with high purity alcohol and ultrasonic waves.
- the cleaning time is not less than 5 minutes. In this embodiment, the cleaning time is not less than 3 minutes.
- the surface of the drill bit is cleaned by using anhydrous alcohol in combination with ultrasonic waves.
- the etched portion 1 of the drill bit is coated to form a tool composite coating at the etched portion.
- the tool composite coating includes a base layer coated on the cutter body and a top layer on the outermost side, the base layer being a diamond layer or a cubic boron nitride layer, the base layer having a thickness of 1 to 40 ⁇ m,
- the top layer is a tetrahedral amorphous carbon film layer and has a thickness of 0.01 to 15 ⁇ m.
- the intermediate layer includes any one of a transition layer and a core layer, or the intermediate layer includes a laminated transition layer and a core layer;
- the transition layer is a Me layer and has a thickness of 0.01 to 10 ⁇ m
- the core layer is a MeX layer and has a thickness of 0.01 to 15 ⁇ m, wherein Me represents Al, Ti, Cr, V, Mn, Fe, Co, Ni, Cu, Zr.
- Me represents Al, Ti, Cr, V, Mn, Fe, Co, Ni, Cu, Zr.
- at least one of the non-metallic elements Si, and X represents one or two or three of N, C, and B.
- the first set of pretreatment length is 5.0mm from the drill tip. That is, the entire groove length is treated by acid-base etching, and the second set of pretreatment length is 2.5 mm from the drill tip.
- the pre-treated drill bit is then deposited in the same furnace under the same conditions to form a coated drill bit.
- test condition speed S 90krpm, drop speed 45mm / s, set the drilling life of 20,000 holes. The results are as follows:
- the coated drill bit of mm has reached the preset life without any broken tools. According to the treatment scheme provided by the invention, the influence of the loss of Co on the strength of the substrate is alleviated, and the phenomenon of broken diamond of the diamond coated drill bit is greatly reduced.
- the coated drill bit of mm has only one broken blade in 50 pieces. The test results show that the treatment scheme provided by the present invention greatly reduces the knife breaking phenomenon of the diamond coated drill bit.
- the method for pretreating the diamond coating of the cemented carbide drill bit provided by the embodiment of the invention not only overcomes the adverse effect of the Co removal treatment on the strength of the tool base, but also ensures the good adhesion between the diamond coating and the substrate. At the same time, it will not affect the processing performance of the drill bit.
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Abstract
一种硬质合金钻头金刚石涂层预处理方法，包括以下步骤：（1）清洁钻头表面；（2）对钻头进行脱Co化学预处理；脱Co化学预处理包括：采用碱液腐蚀钻头的WC相，采用酸液腐蚀钻头的Co相；其中，采用碱液、酸液腐蚀钻头时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L1/10≤A≤L9/10。该方法既克服了脱Co处理对刀具基体强度产生的不利影响，又保证了金刚石涂层与基体具有良好的结合力，同时不会影响钻头的加工性能。
Description
本发明属于硬质合金钻头技术领域，尤其涉及一种硬质合金钻头金刚石涂层预处理方法。
金刚石以其高硬度、高耐磨损性、低摩擦系数，低热膨胀系数、高热导率等优异特性而被视为十分理想的刀具涂层材料。随着汽车、航空和航天工业的发展以及对材质轻量化、高比强度的要求日益提高，金刚石涂层刀具在有色金属、碳纤维增强塑料(CFRP)、玻璃纤维增强塑料(GFRP)、纤维增强金属(FRM)以及石墨、陶瓷等新材料加工中的应用日益广泛。
由于金刚石与硬质合金在热膨胀系数、弹性模量、化学及原子结构等性能上有很大差异，尤其是硬质合金基体中粘结相Co的存在，不仅降低了金刚石的晶核形核率，而且促进了在涂层与基体界面上形成非金刚石的碳物质，严重影响了金刚石涂层的质量及其与基材的结合力。为了得到质量稳定的金刚石涂层刀具，目前对硬质合金表面进行酸碱侵蚀以消除或减弱Co的负面影响这一
方法因简单、低廉且适合于批量生产而被广泛应用。这一方法消除Co的影响的同时，对刀具基体的强度也产生了负面影响，特别是对于微小径刀具，因脱Co处理降低了强度而产生容易断刀的现象。
发明内容
本发明的目的在于克服上述现有技术的不足，提供了一种硬质合金钻头金刚石涂层预处理方法，其既克服了脱Co处理对刀具基体强度产生的不利影响，又也保证了金刚石涂层与基体具有良好的结合力，同时不会影响钻头的加工性能。
本发明的技术方案是：一种硬质合金钻头金刚石涂层预处理方法，包括以下步骤：
(1)清洁钻头表面；
(2)对钻头进行脱Co化学预处理；脱Co化学预处理包括：
采用碱液腐蚀钻头的WC相，
采用酸液腐蚀钻头的Co相；
其中，采用碱液腐蚀钻头的WC相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L1/10≤A≤L9/10；
采用酸液腐蚀钻头的Co相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L1/10≤A≤L9/10。
可选地，采用碱液腐蚀钻头的WC相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/5≤A≤L/2。
可选地，采用酸液腐蚀钻头的Co相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/5≤A≤L/2。
可选地，清洁钻头表面包括以下步骤：采用高纯度酒精和超声波对钻头进行清洗。
可选地，清洗时间不小于3分钟。
可选地，采用碱液腐蚀WC相时，碱液试剂质量配比为铁氰化钾：氢氧化钠：水＝1:1:10，腐蚀时间为2至60分钟。
可选地，采用酸液腐蚀Co相时，试剂的体积配比为浓硫酸：过氧化氢＝1:3，腐蚀时间为10s至5min。
可选地，采用碱液腐蚀钻头的WC相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/3≤A≤L/2；采用酸液腐蚀钻头的Co相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/3≤A≤L/2。
本发明所提供的一种硬质合金钻头金刚石涂层预处理方法，其既克服了脱Co处理对刀具基体强度产生的不利影响，又也保证了金刚石涂层与基体具有良好的结合力，同时不会影响钻头的加工性能。
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的硬质合金钻头金刚石涂层预处理方法中浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系示意图。
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
需要说明的是，当元件被称为“固定于”或“设置于”另一个元件，它可以直接在另一个元件上或者可能同时存在居中元件。当一个元件被称为是“连接于”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中元件。
还需要说明的是，本发明实施例中的左、右、上、下等方位用语，仅是互为相对概念或是以产品的正常使用状态为参考的，而不应该认为是具有限制性的。
如图1所示，本发明实施例提供的一种硬质合金钻头金刚石涂层预处理方
法，其特征在于，包括以下步骤：
(1)清洁钻头表面；
(2)对钻头进行脱Co化学预处理；脱Co化学预处理包括：
采用碱液腐蚀钻头的WC相，
采用酸液腐蚀钻头的Co相；
其中，采用碱液腐蚀钻头的WC相时，浸蚀(腐蚀)部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L1/10≤A≤L9/10，即钻头刃部的长度为L，浸蚀部位的长度A大于十分之一L且小于十分之九L；图中L长度均设置有螺旋槽，A长度为腐蚀区域。
采用酸液腐蚀钻头的Co相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L1/10≤A≤L9/10，即钻头刃部的长度为L，浸蚀部位的长度A大于十分之一L且小于十分之九L。采用酸液腐蚀钻头的Co相和碱液腐蚀钻头的WC相时浸蚀的长度相同，浸蚀的长度不大于钻头刃部长度的十分之九且不小于钻头刃部长度的十分之一，既克服了脱Co处理对刀具基体强度产生的不利影响，又也保证了金刚石涂层与基体具有良好的结合力，同时不会影响钻头的加工性能，钻头刃部强度不会明显降低，在高速加工时不易产生断刀的现象。
具体地，采用碱液腐蚀钻头的WC相时，浸蚀部位为钻头刃部含刀尖且距
离刀尖的长度A与钻头沟槽长度L的关系满足L/6≤A≤L4/5，即浸蚀部位l的长度不大于钻头刃部长度的五分之四且不小于钻头刃部长度的六分之一。采用酸液腐蚀钻头的Co相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/6≤A≤L4/5，即浸蚀部位l的长度不大于钻头刃部长度的五分之四且不小于钻头刃部长度的六分之一。
优选地，采用碱液腐蚀钻头的WC相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/5≤A≤L2/3，即浸蚀部位l的长度不大于钻头刃部长度的三分之二且不小于钻头刃部长度的五分之一；采用酸液腐蚀钻头的Co相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/5≤A≤L2/3，即浸蚀部位l的长度不大于钻头刃部长度的三分之二且不小于钻头刃部长度的五分之一。
更优选地，采用碱液腐蚀钻头的WC相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/5≤A≤L/2，即浸蚀部位l的长度不大于钻头刃部长度的二分之一且不小于钻头刃部长度的五分之一；采用酸液腐蚀钻头的Co相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/5≤A≤L/2，即浸蚀部位l的长度不大于钻头刃部长度的二分之一且不小于钻头刃部长度的五分之一。
本实施例中，采用碱液腐蚀钻头的WC相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/3≤A≤L/2，即浸蚀部位l
的长度不大于钻头刃部长度的二分之一且不小于钻头刃部长度的三分之一；采用酸液腐蚀钻头的Co相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/3≤A≤L/2，即浸蚀部位l的长度不大于钻头刃部长度的二分之一且不小于钻头刃部长度的三分之一。
具体地，清洁钻头表面包括以下步骤：采用高纯度酒精和超声波对钻头进行清洗。
具体地，清洗时间不小于5分钟，本实施例中，清洗时间不小于3分钟。
具体地，腐蚀钻头的Co相后，采用无水酒精结合超声波对钻头表面进行清洁处理。
具体地，采用碱液腐蚀WC相时，碱液试剂质量配比为铁氰化钾：氢氧化钠：水＝1:1:10，腐蚀时间可为2至60分钟。
具体地，采用酸液腐蚀Co相时，试剂的体积配比为浓硫酸：过氧化氢＝1:3，腐蚀时间为10s至5min。
具体应用中，腐蚀钻头的Co相后，对钻头的浸蚀部位l做涂覆涂层处理，以在浸蚀部位处形成刀具复合涂层。具体地，刀具复合涂层包括涂覆于刀具本体的基底层和位于最外侧的顶层，所述基底层为金刚石层或立方氮化硼层，所述基底层的厚度为1至40μm，所述顶层为四面体非晶碳膜层且厚度为0.01至15μm。所述基底层与所述顶层之间还设置有至少一层中间层，所述中间层包括过渡层和核心层中的任意一层，或者，所述中间层包括层叠的过渡层和核心层；
所述过渡层为Me层且厚度为0.01至10μm，所述核心层为MeX层且厚度为0.01至15μm，其中Me代表Al、Ti、Cr、V、Mn、Fe、Co、Ni、Cu、Zr以及非金属元素Si中的至少一种，X代表N、C、B中的一种或两种或三种。
实验例一：
首先取同一生产批次的钻径Φ0.40mm、槽长5.0mm的PCB加工用微型钻头100支，把它们随机等分2组，每组50支，第一组预处理长度距离钻尖5.0mm，即整个槽长都做酸碱蚀刻处理，第二组预处理长度距离钻尖2.5mm。然后把这批预处理的钻头在相同条件下同一炉内沉积金刚石涂层制作涂层钻头。并在陶瓷填料PCB板上加工测试，测试条件转速S＝90krpm，落速45mm/s，设定钻孔寿命20000孔。结果如下：
第一组整个槽长都做酸碱蚀刻处理的微钻，涂层后加工陶瓷调料PCB板，50支钻头断刀15支，断刀率30％；而第二组预处理长度距离钻尖2.5mm的涂层钻头，50支均达到预设寿命没有断刀出现。说明按照本发明所提供的处理方案，减轻了Co的损失对基材强度的影响，大大降低了金刚石涂层钻头的断刀现象。
实验例二：
取同一生产批次的钻径为Φ1.00mm槽长10.5mm的PCB加工用微型钻头100支，随机等分2组每组50支，第一组整个槽长都做酸碱蚀刻处理，第二组预处理长度距离钻尖3.5mm。然后把这批预处理的钻头在相同条件下制作涂层钻头。并在陶瓷填料PCB板上加工测试，测试条件转速S＝55krpm，落速57mm/s，设定钻孔寿命20000孔。结果如下：
第一组整个槽长都做酸碱蚀刻处理的微钻，涂层后加工陶瓷调料PCB板，50支钻头断刀13支，断刀率26％；而第二组预处理长度距离钻尖3.5mm的涂层钻头，50支仅有1支出现断刀现象。测试结果说明按照本发明所提供的处理方案，大大降低了金刚石涂层钻头的断刀现象。
本发明实施例所提供的一种硬质合金钻头金刚石涂层预处理方法，其既克服了脱Co处理对刀具基体强度产生的不利影响，又也保证了金刚石涂层与基体具有良好的结合力，同时不会影响钻头的加工性能。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换或改进等，均应包含在本发明的保护范围之内。
Claims (8)
- 一种硬质合金钻头金刚石涂层预处理方法，其特征在于，包括以下步骤：(1)清洁钻头表面；(2)对钻头进行脱Co化学预处理；脱Co化学预处理包括：采用碱液腐蚀钻头的WC相，采用酸液腐蚀钻头的Co相；其中，采用碱液腐蚀钻头的WC相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L1/10≤A≤L9/10；采用酸液腐蚀钻头的Co相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L1/10≤A≤L9/10。
- 如权利要求1所述的硬质合金钻头金刚石涂层预处理方法，其特征在于，采用碱液腐蚀钻头的WC相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/5≤A≤L/2。
- 如权利要求1所述的硬质合金钻头金刚石涂层预处理方法，其特征在于，采用酸液腐蚀钻头的Co相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/5≤A≤L/2。
- 如权利要求1所述的硬质合金钻头金刚石涂层预处理方法，其特征在于，清洁钻头表面包括以下步骤：采用高纯度酒精和超声波对钻头进行清洗。
- 如权利要求4所述的硬质合金钻头金刚石涂层预处理方法，其特征在于， 清洗时间不小于3分钟。
- 如权利要求1所述的硬质合金钻头金刚石涂层预处理方法，其特征在于，采用碱液腐蚀WC相时，碱液试剂质量配比为铁氰化钾：氢氧化钠：水＝1:1:10，腐蚀时间为2至60分钟。
- 如权利要求1所述的硬质合金钻头金刚石涂层预处理方法，其特征在于，采用酸液腐蚀Co相时，试剂的体积配比为浓硫酸：过氧化氢＝1:3，腐蚀时间为10s至5min。
- 如权利要求1所述的硬质合金钻头金刚石涂层预处理方法，其特征在于，采用碱液腐蚀钻头的WC相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/3≤A≤L/2；采用酸液腐蚀钻头的Co相时，浸蚀部位为钻头刃部含刀尖且距离刀尖的长度A与钻头沟槽长度L的关系满足L/3≤A≤L/2。
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