JPS61265207A - Electrodeposited milling tool - Google Patents

Abstract

PURPOSE:To improve cutting efficiency of a tool for a fragile material like a ceramic molded material or gel coating resin, by electrodepositing a hard abrasive grain of diamond and CBN or the like on the milling tool. CONSTITUTION:A milling tool cutting edge part 1 in a formed cutter 5, gluing a hard abrasive grain 2 of diamond, CBN, etc. to adhere by the plating method, forms a plated layer 3. A milling tool, worsening roughness of a cut surface if the abrasive grain is in a large size while decreasing a tool life if the grain is in a small size, obtains a good result for the size of about #80-#400. The tool obtains a good result for the abrasive grain embedding rate of about 70% or more. Further, the abrasive grain can use also Al2O3, SiC, etc. in addition to the above described in accordance with a use.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to improvements in end mills, cutters, and profile milling tools.

[Conventional technology]

Ceramics are attracting a lot of attention as new materials due to their good functionality and performance, but they are not always fully utilized because of their poor processability.

The process of molding ceramics is usually to use a mold to sinter the product into a shape close to that of the product, and then perform final grinding using a diamond grindstone.

Recently, in order to improve the quality of ceramic molded products, molding methods using press or hot isostatic pressing have begun to be widely used, but this molding method has not seen any improvement in electrodeposition. This is the current situation.

[Problem that the invention seeks to solve]

In any case, if there are many parts to be removed, the molded body is rough-cut using a cutting tool, but the molded body is fragile and aprecipitate (prone to accelerate tool wear).
Due to its nature (the same applies hereafter), it must be handled with care.

Furthermore, in order to expand the uses of ceramics, it is necessary that they can be easily processed into desired shapes.

When machining brittle and abrasive materials such as ceramic molded bodies, cutting tools must satisfy two contradictory properties.

That is, for brittle cutting, a sharp and positive rake angle is required to improve workability, and for apresive cutting, it is necessary to increase wear resistance.

For example, a general cemented carbide G1 machining tool lacks wear resistance and causes excessive wear with a small amount of cutting, resulting in damage to the fragile workpiece.

The present invention provides a cutting tool that can easily process ceramic molded bodies that are difficult or difficult to cut with conventional cutting tools, or brittle and extremely abrasive materials such as Delcoat resin. The purpose is to provide the following.

[Means for solving problems]

In order to make it easier to process materials such as ceramic molded bodies and Delcoat resins, the present inventors analyzed their characteristics and developed a milling tool that is particularly useful for creating curved surfaces or three-dimensional contours. We considered using this method for cutting.

As a result, the present invention focuses on the electrodeposition of Guyamond abrasive grains as a means to solve the above-mentioned problems, and applies this to milling as well.

As shown in FIGS. 1 to 4, the present invention includes an end mill 4, a general shape 7
The present invention is characterized in that a plating layer 3 is formed by attaching hard abrasive grains 2 such as diamond, CBN, etc. to the cutting edge 1 of a milling tool such as a milling cutter 5.6 by a plating method.

The cutting edge portion 1 is composed of a rake surface 1a and a ridged surface 1b, and therefore substantially consists of the rake surface 1a and the ridged surface 1.
Both sides of b will be plated.

Incidentally, abrasive grain electrodeposition by plating is known as an electrodeposition grindstone. That is, the abrasive grains are used as cutting edges, and the gaps between the abrasive grains are used as chip pockets to perform grinding in minute amounts. However, in the present invention, the blade groove 1c of the milling engineer is used as a chip pocket, and no gap between the abrasive grains is necessary.

Furthermore, there is an example in JP-A-56-95528 in which a cutting tool is electrodeposited with abrasive grains, but this relates to a reamer rather than a milling cutter, and the burnishing effect of the abrasive grains was expected. The purpose of this invention is completely different from that of the present invention.

[For production]

The milling tool of the present invention exhibits the same function as a normal cutting tool, but the cutting waste is generally in the form of powder, and tool wear progresses from the plated portion. However, due to the action of the hard grain, the tool holder is lengthened by m.

If the abrasive grain size is large, the roughness of the cutting surface will be poor, and if the abrasive grain size is small, the tool life will be shortened. Experimentally, as shown in Figure 5, #80 to #
400 gave good results.

As the abrasive grain embedding rate is not required to function as a whetstone, it is desirable to have a higher abrasive grain embedding ratio.In the case of a whetstone, good results are obtained at 50 to 80%, but in the present invention, good results were obtained at 70% or more.

Also, diamond showed the best results for abrasive grains, but CB
N, A1. O, SiC cleaning can also be used in consideration of the application and economical efficiency.

[Example 1] An end mill was used for cutting a silicon nitride ceramic molded body under the following conditions, and the following results were obtained.

Workpiece Silicon nitride ceramic molded body φ1
22-sided end mill Peripheral speed 57m/win Depth of cut 6m axial feed Re 100a++i/Results Invention product (#120 Gouya abrasive grain) Cutting length 1.85m Conventional product (base material (high fill) as is) Cutting length 0.12 m [Example 2] Epoxy resin for Delcoat was cut, and the particle size and type of abrasive grains were investigated, and the following results were obtained. Especially #12
Diamond abrasive grains around 0 showed the best results.

Workpiece Epoxy resin workpiece for Delcoat φ122 Hirakata end mill Peripheral speed 150 S/sin depth of cut 9X
3mm Feed Re 180 Work/win result Invention product A ($120 Gouya abrasive) Cutting length 7- Tool wear 0.15mm /I B (#200 Gouya abrasive) Cutting length 3 - Tool wear 0. 15mm // C ($140CBN abrasive grain) Cutting length 6.5- Tool wear 0.28mm Conventional product (base material remains*) Cutting length 0.2- Tool wear 1.10! II+ [Effects of the Invention] As described above, according to the seven rice screens of the present invention, ceramic molded bodies, resins for Delcoat, etc. can be practically easily processed.

In addition, even in three-dimensionally continuous cutting blades such as end mills, cutters, and form mills, hard abrasive grains can easily
1! Since it is possible to carry out a bonding process, the tool can be manufactured easily and inexpensively, and the base material can be recycled, making it economical and has great industrial effects.

Although the above explanation has been given with reference to the cutting of ceramic molded bodies and resin for Delcoat, the tool of the present invention has the same effect on cutting plaster models for molds, etc., which have similar properties. It is something that plays.

[Brief explanation of the drawing]

Figure 1 is an enlarged perspective view of the cutting edge, Figure 2 is a front view of the hammer, Figure 3 is a perspective view of the cutter, Figure 4 is a perspective view of the general milling cutter, Figure 5 is the grain size of the abrasive grain. It is a figure which shows the relationship between and the cuttable length. 1: Cutting edge portion, 2: Hard abrasive grains, 3: Plating layer,
4: Reamer, 5: Cutter, 6: Total form 7 Rice agent Patent attorney Takashi Honma*/@) i42 Figure 3, Figure 3 Figure 4@

Claims (3)

[Claims] (1) Electroplated milling tools, such as end mills, cutters, and profile milling cutters, in which diamond, CBN, or other hard abrasive grains are adhered to the cutting edge by plating. (2) Hard abrasive grains with a grain size finer than #80 are used at an embedding rate of 70.
% or more of the electrodeposited milling tool according to claim 1. (3) The electrodeposition milling tool according to claim 1 or 2, wherein both the rake angle and the rake angle are positive.