JPS5843196B2 - Cutting edge metal alloy for woodworking tools - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cutting edge filler alloy for woodworking tools that has excellent wear resistance, impact resistance, high machinability, and excellent filler workability.

Woodworking tools such as saws, electric planer blades, drills, etc. are made with a specific alloy applied to the cutting edge to improve its cutting performance on wood. .

Co-based alloys, mainly stellite, are widely used as these cutting edge filler alloys.
In these conventional alloys, those with high wear resistance generally have low impact resistance, and conversely, those with high impact resistance have low wear resistance, so they are prone to cracking due to wear or impact during use. This had the disadvantage that it required repair or became unusable in a short period of time.

On the other hand, with the recent advances in building materials and the increase in imported materials, the need for processing various processed materials and hard materials such as melapin, agathis, spool, and even rosewood and ebony has increased. There is also a desire to develop cutting edge metal alloys for woodworking tools that have a long service life.

Therefore, from the above-mentioned viewpoint, the inventors of the present invention (a)
It must have sufficient wear resistance and high temperature hardness to extend the service life of the tool, as well as good impact resistance.

In other words, it must have an optimal balance of impact resistance and abrasion resistance.

(b) Excellent cutting performance.

(c) It has almost the same coefficient of thermal expansion as steel, and has good metal workability and grindability.

As a result of conducting research to obtain cutting edge metal alloys for woodworking tools having the properties shown in (a) to (cFJ) above, (1) cutting edge metal alloys for tools have excellent wear resistance, high-temperature strength, and heat resistance. From the point of view of expansion coefficient, those containing Co as the main component are optimal.

(2) The inclusion of Fe in the Co-related alloy has the effect of improving the toughness of the alloy.

(3) Inclusion of Si is very effective in improving castability and weldability.

(4) The wear resistance of the Co-based alloy is improved by the inclusion of Mo, and the high-temperature strength is further stabilized by the addition of (4).

The findings shown in items (1) to (4) above were obtained.

Therefore, this invention was made based on the above knowledge, and the cutting edge filler alloy for woodworking tools has the following properties in terms of weight φ: C: 1.5 to 3.5%, W: 5.0 to 20.0. Cr: 20.0-35.0%, Fe: 10.0-25.0%, Mo: 3.0-9.0%, Mn: 2 or less, Si: 2 or less, ■: 5 It is characterized by having a composition consisting of: Co and unavoidable impurities: the remainder.

Next, in the cutting edge metal alloy for woodworking tools of the present invention,
The reason why the composition ranges of C, W, Cr, Fe, Mo, Mn, Si, and component (2) are limited as described above will be explained.

(a) C The C component has the effect of forming carbides with Cr, W, and Mo to improve hardness, but if its content is less than 1.5 yen, the desired high hardness cannot be secured, and method 3 If the content exceeds .5%, the impact resistance will decrease, so the content should be reduced by 1%.
．． It was set as 5 to 3.5 excellent.

(b) w The W component has the effect of increasing the hardness of the alloy by forming carbides, and further increasing the hardness of the matrix, but if its content is less than 5%, the desired excellent wear resistance will not be achieved. On the other hand, if it exceeds 20%, grindability and metal workability will deteriorate, so the content should be reduced to 5 to 2%.
It was set to 0φ.

In particular, when used for saw blades, the content is preferably 8 to 18 pieces.

(c) Cr Cre has the effect of dissolving in Co to improve the hardness of the solid solution and forming carbides to improve the hardness of the alloy, but if its content is less than 20%, The hardness is insufficient, and on the other hand, if it exceeds 35 mm, brittleness increases, and grindability and metal workability decrease, so the content is reduced to 2.
It was set at 0 to 35%.

Especially when used for saw blades, the content should be 22 to 33%.
It is preferable that

(d) Fe The FeC component has the effect of improving the toughness of the alloy, but
If the content is less than 10 threads, the desired effect cannot be obtained, and the alloy is therefore hard and brittle, so it is necessary to contain it in an amount of 10% or more.

However, if the content exceeds 25 threads, the hardness of the alloy will decrease too much, so the content was set to 10 to 25 threads.

(e) M.

The Mo component has the effect of increasing the high-temperature hardness of the alloy, promoting age hardening and strengthening the austenite matrix, thereby improving wear resistance, but if the Mo content is less than 3%, the desired effect may not be achieved. Since chopped fruits cannot be obtained and the alloy cost increases in spite of the improved effect if the diameter exceeds 9φ, the content was set to 3 to 9 pieces.

(f) Mn The Mn component is added for the purpose of deoxidation and desulfurization, but if it is contained in an alloy in excess of 2, the toughness of the alloy will decrease and cracks, chips, etc. will occur. Therefore, its content was set to 2% or less.

(g) Si The Si component has a soot effect that improves castability and weldability, but if it is included in more than 2 parts, cracks will occur in the alloy, so the content should be kept below 2 parts. did.

(h) v The ■ component generally forms fine carbides that are difficult to coarsen, and also strongly stabilizes Cr and N.
When containing a large amount of , Mo, W, etc., it is alloyed with these components, stabilizes the alloy structure, and has the effect of increasing high temperature strength, but if it is contained in excess of 5%, the toughness decreases. Therefore, the content was set to 5φ or less.

(i) C.

The Co component is an element related to austenite formation, and is preferably contained in 30 or more strips in order to strengthen the matrix of the alloy and improve high-temperature strength and wear resistance.

Next, the cutting edge filler alloy for woodworking tools of the present invention will be explained using examples and comparing with comparative examples.

Invention alloys 1 to 3 and comparative alloys having the compositions shown in Table 1 were placed on a commercially available band saw having a length of about 13.6 m (45 shaku), a width of 20 cIfL (8 inches), and a thickness of 1.45 mm. 1
- 4 as the cutting edge, each was deposited by a commonly used method.

Next, regarding the band saw with the blade edge plate obtained as a result, the test machine used was a 72-inch band saw machine, and the materials to be cut were Melapin, spool, agathis, and ebony, which are difficult-to-cut materials in the wood industry, and horse crab 150HP1. *
Band saw rotation speed: 450 r, p, m.

A cutting test was conducted under the following conditions: depth of cut: 200 mm/rotation, and the cutting time until the first repair was required for the above band saw was measured, and the results are shown in Table 2 along with the workability of the band saw. .

As is clear from the results shown in Table 2, the alloy of the present invention exhibits extremely good workability in overlaying compared to comparative alloys with compositions outside the range of the composition of the present invention, and Band saws that have been primed with metal have a significantly longer edge life.

As mentioned above, the cutting edge metal alloy for woodworking tools of the present invention is
Since it has an optimal balance of impact resistance and abrasion resistance compared to conventional products, it not only significantly increases the tool's cutting edge life by 2 to 5 times, but also provides excellent metal workability. Because of this, it has characteristics that improve the efficiency of woodworking operations, such as the ability to economically obtain a sound metal cutting edge.

Claims (1)

[Claims] i C: 1.5-3.5%, W: 5.0-20.0%, Cr: 20.0-35.0%, Fe: 10.0-25.0% , Mo: 3.0 to 9.0%, Mn: 2.0 or less, Si: 2.0 or less, V: 5.0φ or less, Co and unavoidable impurities: remainder, (weight ratio) Cutting edge metal alloy for woodworking tools.