JPS5890465A - Method of producing rotary dresser - Google Patents

Abstract

PURPOSE:To improve dimensional accuracy by filling powder consisting of tungsten and the like and iron base powder and adding infiltrating agent thereto to heat and infiltrate them. CONSTITUTION:Supergrains 2 such as diamond are lightly attached to the surface of a negative mold 1, and a core 3 is inserted in the center of the surface of the negative mold 1. Iron base powder 8 in addition to metal powder 4 consisting of tungsten and others as metal powder fillers is put in a space between the core 3 and the mold 1 concentrically and then subjected to infiltration, heating, etc. Alloy consisting of CU-Ni-Zn, etc. is infiltrated in the iron base powder 8 which solid solves a main component of infiltrating material, copper. Thus, contraction caused by infiltration to the metal powder 4 consisting of tungsten and others through expansion is compensated for so that as a whole the dimensional variation by infiltration is remarkably reduced to provide a rotary dresser with high dimensional accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an improvement in the method of manufacturing a rotary dresser by sinter infiltration.

The conventional manufacturing method and product of this rotary dresser will be explained with reference to FIGS. 1 and 2.

In the figure, reference numeral 1 denotes a negative mold made of graphite, for example, which has an inner mold surface finished to the required shape and dimensions, and 2 tons of superabrasive grains such as diamond are coated on this inner peripheral mold surface.
- Lightly attach the core 8, insert and assemble the core 8 into the center of the negative mold surface, fill the space between the inner peripheral mold surface of the negative mold 1 and the outer peripheral surface of the core 8 with metal powder 4 made of tungsten or the like; An infiltrant material 5 made of an alloy such as Cu-Ni-Zn is placed on top of the infiltrant material 5, and when the whole is heated above the melting point of the infiltrant material 5, the melting of the infiltrant material 5 drops and the metal powder 4 is heated. If it penetrates into the gap and then cools, it will solidify and form superabrasive grains 2,
An infiltrated body containing the metal powder 4 is completed. Thereafter, unnecessary negative mold 1, core 8, etc. are removed, and the desired size and shape are finished to obtain a rotary dresser having a superabrasive surface 6 as shown in FIG.

As the metal powder bed 4 is usually made of expensive gold powder such as tungsten, in order to reduce the use of it,
For example, as shown in FIG. 3, there is a case where a bush 7 consisting of an iron base 4 and a t is assembled together with a negative mold 1, and infiltration is performed. In this case, the infiltrated superabrasive grains 2, metal powder 4, and bush 7 are integrally molded.

However, when using the method explained in Fig. 1, expensive powder such as tungsten is used for multi-electrode as described above, resulting in high manufacturing costs, and when using the method explained in Fig. 8, infiltration The wetting of the material 5 and the bushing 7 is insufficient even with the first injection, resulting in poor brazing and, as a result, the adhesive strength between the bushing 27 and the infiltrated body is weak.

'Also, since different metal materials are joined together, internal stress is generated when the infiltrant material solidifies during the cooling process after infiltration.
Further, distortion is likely to occur due to the difference in thermal expansion coefficients, and the precision of the superabrasive grain surface 6 of the rotary dresser is poor.

Therefore, in view of the problem of the ridged rotary dresser, the present invention has been developed by lightly adhering superabrasive grains such as diamond to the mold surface of the negative mold, and inserting a core or bushing into the center of the negative mold surface. Conventionally, a composite powder made of tungsten or the like would be filled into the space between the mold surface and the core, and the space would be infiltrated and heated in the process described above. As a filling metal powder in
In addition to the metal powder made of tungsten or the like, an iron-based powder is concentrically filled in the space, and subsequent steps such as infiltration and heating are performed to form the iron-based powder KCu-Ni -
By infiltrating an alloy made of Zn or the like, the iron-based powder dissolves copper, which is the main component of the infiltrant, to cause expansion and compensate for the shrinkage caused by infiltration of metal powder such as tungsten. The present invention aims to provide a rotary dresser that has extremely small dimensional changes due to infiltration as a whole and has high dimensional accuracy.

The implementation of the present invention will be explained below with reference to FIG.

As I have already mentioned in part, the core 8 is inserted into the center of negative mold 1, and the inner peripheral surface of negative mold 1 and core 8 are
A conventional metal powder 4 made of tungsten or the like and an iron-based powder bed 8 are concentrically filled between the outer peripheral surfaces of the mold surface from the mold surface side. An example of such a filling method is to place an annular partition wall 9 in advance at an interface position corresponding to the boundary between a layer of metal powder 4 made of tungsten or the like and a layer of iron-based powder 8, and to place a ring-shaped partition wall 9 in advance at the interface position between the layer of metal powder 4 made of tungsten or the like and the layer of iron-based powder 8. Lightly resistant to super abrasive grain 2, friend negative! A metal powder 4 made of tungsten or the like is filled in the space formed by the inner peripheral surface of the tube mold 1, and an iron-based powder bed 8 is filled between the core 8 and the partition wall 9.
At the final stage when filling is completed, the partition wall 9 is removed. Note that the components of the iron-based powder 8 will be explained later.

A concentric two-layer structure powder filling body is made, the infiltration material 5 is placed on top of it, the whole is heated to a temperature higher than the melting point of the infiltration material 5, infiltration is performed, and finishing is performed in the same manner as before. By carrying out these steps, a rotary dresser according to the present invention as shown in FIG. 5, for example, can be obtained.

As the infiltrant material 5, copper, nickel, zinc alloys and other materials, such as those already described, are used.

In the implementation of the present invention explained in FIG. 4, the core 8 is used, but if this is replaced with the bush 7 as explained in FIG. 3 and infiltration etc. A rotary dresser with bushings as shown is obtained.

In this case, the bushing 7 is made of iron-based sintered alloy or the sixth bushing.
The bushing 7 and the infiltrated body can be perfectly joined by using an iron alloy, for example, stainless steel, which has a reverse tapered groove lO for preventing rotation as shown in the figure.

Tungsten powder filling with apparent density &gt/ca and Table 1
The specimen shown in is brought into contact with the infiltrating material (melting point: 890°C) containing Cu-Ni-Zn as the main component, and the whole is heated to 1080°C in a protective air flow to melt it. The tungsten infiltrated body was simultaneously infiltrated into the tungsten powder and bonded to the specimen. After solidification and cooling, the bonding strength between the tungsten powder infiltrated body and the specimen infiltrated body was measured.

Table 1 From the above test examples, it can be seen that even iron alone has a strength of 6.4 edge/- and is sufficiently durable for use, but it was found that the addition of Cu and C brings about various effects. That is, it can be seen that the addition of C is extremely effective in improving the transverse rupture strength. Also C
Although it is presumed that the addition of u is effective in improving the wettability between the infiltrant and the Fe powder, it is rather unfavorable in terms of strength. However, it has been found that a significant improvement in strength can be obtained by reducing the amount of carbon and adding C at the same time.

The above test examples show that in the iron-based powder used in the present invention, when copper is added as an element below 0.01%, it is difficult to recognize the effect of addition, and when it exceeds 2096%, the strength decreases. , a range of 0.01% to 20% is suitable, and carbon is 0.0196% or less.
),! It is difficult to recognize the effect of the addition. 45g! If the value exceeds 5, a cast iron structure will be formed and the strength will be disadvantageous, so 0.01 to 4.
A range of 596 is preferable, and the balance is preferably iron powder.

In this example, the iron-based powder mixture to be filled was Fe-Cu-
Powder metallurgy teaches that mechanical strength can be improved by adding additive elements other than Cu and C, such as Ni, Cu, Mn, Co, etc. Needless to say, various powder formulation designs can be made to suit the needs.

According to the manufacturing method of the present invention explained above, as mentioned above, expensive powder such as tungsten can be saved, and
In addition to obtaining high dimensional accuracy of the abrasive surface of the Taly dresser, the infiltrant forms a network structure, so the adhesive strength between the tungsten powder layer and the iron-based powder layer is significantly increased. Furthermore, if a bushing having a reversely tapered groove 1o as shown in FIG. It has a high damping ability against unraveling vibrations, which has a strong anti-rotation effect, and does not cause abnormal vibrations.Also, since it is not entirely made of Dungesten powder, it is lightweight and easy to handle.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a conventional method of manufacturing a rotary dresser. FIG. 2 is a sectional view of a rotary dresser manufactured by the conventional rotary dresser manufacturing method explained in FIG. FIG. 8 is a diagram illustrating another method of manufacturing a conventional rotary dresser. FIG. 4 is a diagram illustrating a method of manufacturing a rotary dresser according to the present invention. FIGS. 5 and 7 each show a cross section of a rotary dresser made according to the present invention. FIG. 6 shows the appearance of an example of a bushing used in carrying out the present invention. 1...Negative type, 2...Super abrasive, 8...Medium...
4. Gold powder made of tungsten, etc., 5.
・Infiltration material, 6... Super abrasive surface, 7... Dash, 8.
... Iron-based powder, 9 ... Partition wall, 10 ... Inverted tapered groove. Figure 1, Figure 76, Figure 2, F50 Procedural Amendments Commissioner of the Japan Patent Office Shima 1) Haruki Tono L Incident Patent Till (W56 Seigozan Takatoin Petition No. 182909 No. 2, Title of Invention: Rotary Dresser Manufacturing method 3, Relationship with the case of the person making the amendment Patent applicant address 1-9-20-5 Nishinakajima, Yodoyo-ku, Osaka City, Date of amendment order Voluntary amendment 6, Detailed explanation of the invention subject to amendment Column 7 for a brief explanation of the drawings Contents of the amendment (1) "Dankste/" on the third line of page 9 of the specification is corrected to "tungsten". ``Tungsten'' is corrected. (3) ``Dash'' in the first line of page 1 of the same page is corrected to ``Butsuj.'' Procedural amendment 1. Indication of the incident 1956 Hatano Shinsakumon Application No. 182909 2, Name of Inventor Juryo, Manufacturing method for rotary dresser 8, Relationship with the case of the person making the amendment Patent applicant address: 2-80 Otori Kita-cho, Sakai City Name: Osaka Diamond Kogyo Co., Ltd. 4, Agent Address: 1-9-20-6 Nishinakajima, Yodoyo-ku, Osaka City, Claims subject to amendment Column 7: Detailed description of the invention (1) Specification, page 8, line 8 (u J) is corrected as "Cr". (2) Table 1 on page 7 of the Ming A Cao is corrected as shown in the attached sheet. (3) The scope of claims for % is corrected as shown in the attached sheet. Table 1 2. Claims (+1) The mold surface of the negative mold is resistant to adhesion of superabrasive grains, and a core or bushing is arranged in the center of the negative mold,
Powder made of tungsten or the like and iron-based powder are filled concentrically from the negative mold surface side between the negative mold surface and the outer peripheral surface of the core or bushing, and an infiltrant is placed therein and heated. 1. A method for manufacturing a rotary dresser, which comprises infiltrating and sintering a powder made of at least superabrasive grains, tungsten, etc., and an iron-based powder filler to integrate them. (2) When a bushing is arranged at the center, the bushing is made of an iron alloy and has a groove on its outer periphery to prevent rotation. A method of manufacturing the described rotary dresser.

Claims (2)

[Claims] (1) Adhering superabrasive grains to the mold surface of a negative mold, placing a core or bushing in the center of the negative mold,
Powder made of tungsten or the like and iron-based powder are filled concentrically from the negative mold surface side between the negative mold surface and the outer circumferential surface of the core or bushing, and an infiltrant is placed thereon and heated and melted. 1. A method for manufacturing a rotary dresser, which comprises soaking and sintering a powder made of at least superabrasive grains, tungsten, etc., and an iron-based powder filling to integrate them. (2) When a bushing is arranged at the center, the bushing is made of iron alloy and has a groove for preventing rotation on its outer periphery. A method for manufacturing a rotary dresser according to item 2.