JPH106242A - Hammer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hammer which has an excellent durability and easy manufacturability and which can favorably be used in crushing a silicon lump. SOLUTION: The head 4 of a hammer is composed of a base 10 and a striking part (12a and 12b) made of tungsten carbide joined with the base 10. The boundary surface of the base with the striking part includes the first slope (22a, 22b, 28a, 28b) inclining to a prescribed side and the second slope (24a, 24b, 30a, 30b) inclined to the opposite side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is advantageously applied to the crushing of silicon chunks, in particular, the crushing of rod-shaped polycrystalline silicon chunks into fist-sized pieces called nuggets. About the hammer that can be.

[0002]

2. Description of the Related Art As is well known, a silicon wafer for manufacturing a semiconductor device forms a rod-shaped polycrystalline silicon mass by the Siemens method, and then crushes the silicon mass into a crushed piece of a fist size. And, using such crushed pieces as raw materials,
A cylindrical single crystal silicon ingot is generated by the Czochralski method, and the silicon ingot is cut.
Manufactured by grinding. The crushing of the rod-shaped polycrystalline silicon block is usually performed by hitting the silicon block with a manual hammer. In such a crushing operation, it is important to prevent silicon from being contaminated by impurities as much as possible. When impurities such as heavy metals and alkali metals adhere to the surface of polycrystalline silicon, single-crystal silicon produced tends to generate crystal defects, which adversely affects the performance of a semiconductor device as a final product.

[0003] Japanese Patent Application Laid-Open No. 6-218677 discloses a hammer for crushing a polycrystalline rod-shaped silicon lump, in which a handle and a base of a head are integrally formed from steel, and a striking portion is formed adjacent to the base of the head. A hammer is disclosed in which the handle, the base of the head, and the hitting portion are arranged and sealed with a synthetic resin outer shell, exposing only the tip portion of the hitting portion. Tungsten carbide, which almost never contaminates silicon even when it is brought into contact with silicon (the term “tungsten carbide” used in the present specification is not limited to tungsten carbide substantially containing no other metal,
(Including a tungsten carbide alloy containing cobalt or the like).

[0004]

SUMMARY OF THE INVENTION Accordingly, Japanese Patent Application Laid-Open No.
The hammer disclosed in Japanese Patent No. 18677 includes
(1) Interconnection between the base of the head made of steel and the hitting portion made of tungsten carbide is not always sufficient, and the hitting portion comes off due to short-term use. (2) Synthetic resin The enclosing operation using the outer shell is relatively complicated, and there are problems such as an increase in manufacturing cost.

[0005] The present invention has been made in view of the above-mentioned facts, and a main technical problem thereof is that it is possible to sufficiently prevent silicon from being contaminated by impurities and perform crushing of silicon chunks. In addition, it is to provide a new and improved hammer that is durable and relatively easy to manufacture.

[0006]

In order to solve the above-mentioned main technical problems, in the present invention, a base made of a suitable material such as steel and directly connected to a handle and a base made of tungsten carbide are used. The hitting portion and the first inclined surface that is inclined in a direction approaching the longitudinal center line of the handle as it moves away from the handle in the longitudinal direction of the handle and the handle in the longitudinal direction of the handle following the first inclined surface And a second inclined surface that is inclined in a direction away from the longitudinal centerline of the handle as it goes away from, or inclined in a direction away from the longitudinal centerline of the handle as it goes away from the handle in the longitudinal direction of the handle. A boundary surface comprising a first inclined surface and a second inclined surface inclined in a direction approaching the longitudinal center line of the handle as the distance from the handle in the longitudinal direction of the handle is increased following the first inclined surface. Joined to each other via That.

That is, according to a first aspect of the present invention, as a hammer for achieving the above technical object, an elongated handle is provided, and a hammer is provided at a tip of the handle and in a lateral direction with respect to a longitudinal direction of the handle. An extending head, the head being formed from a base directly connected to the tip of the handle and a hitting portion disposed at at least one end of the base, wherein the hitting portion is made of tungsten carbide. In the hammer, the base portion and the hitting portion are formed such that the first inclined surface and the first inclined surface which are inclined in a direction approaching a longitudinal center line of the handle in a longitudinal direction of the handle as the distance from the handle increases. And a second inclined surface that is inclined in a direction away from the longitudinal center line of the handle as it moves away from the handle in the longitudinal direction of the handle following the inclined surface of the handle. Hammer provided That.

According to a second aspect of the present invention, there is provided an elongated handle, and a head located at a tip of the handle and extending transversely to a longitudinal direction of the handle, wherein the head is provided with the handle. And a striking portion provided at least at one end of the base portion.The striking portion is a hammer made of tungsten carbide. Following the first inclined surface and the first inclined surface that are inclined in a direction away from the longitudinal center line of the handle as the distance from the handle in the longitudinal direction of the handle increases, the length of the handle in the longitudinal direction of the handle continues. A hammer is provided, wherein the hammers are joined to each other via a boundary surface consisting of a second inclined surface inclined in a direction approaching a longitudinal center line of the handle as the distance from the handle increases.

It is preferable that the angle formed by the first inclined surface and the second inclined surface is 100 to 150 degrees.
The first inclined surface and the second inclined surface may be flat. In a preferred form, the handle and the base of the head are integrally formed from steel and the striking portion is brazed to the base. The hitting portion preferably has a cylindrical side surface and a tip surface that forms a part of the spherical surface. The handle extends substantially straight, the head extends substantially straight and substantially perpendicular to the handle,
Conveniently, the striking portions are disposed at both ends of the base of the head, and the head is line-symmetrical with respect to the longitudinal center axis of the handle.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present invention will be described below in more detail with reference to the accompanying drawings.

FIGS. 1-4 illustrate a preferred embodiment of a hammer constructed in accordance with the present invention. The hammer shown comprises a handle 2 and a head 4 located at the tip of the handle 2. The handle 2 is elongated substantially straight, and the head 4 is substantially perpendicular to the handle 2 and substantially straight. Therefore, pattern 2
The central longitudinal axis 8 of the head 4 extends substantially perpendicular to the central longitudinal axis 6 of the head 4. If desired, the head 4 may be moved rearward or forward with respect to the handle 2, especially if a hitting portion is provided at only one end of the head 4, rather than at both ends (the hitting portion will be described in detail later). It can also be slightly inclined. As can be clearly understood by referring to FIG. 1, the head 4 is formed from a base 10 and hitting portions 12a and 12b disposed at both ends of the base 10. The base 10 is directly connected to the handle 2, and the hitting portion 12a
And 12b are formed separately from the handle 2 and the base 10, and are joined to the base 10. Although the base 10 of the head 4 can be formed separately from the handle 2 and joined to the tip of the handle 2 by an appropriate means, it is preferable that the base 10 of the head 4 be formed integrally with the handle 2. . As can be understood by referring to FIGS. 2 and 4, the head 4 composed of the base 10 and the hitting portions 12 a and 12 b is formed in a line-symmetrical shape with respect to the longitudinal center axis 6 of the handle 2.

Continuing the description with reference to FIGS.
The handle 2 has an elongated solid bar shape, and its cross-sectional shape has an arc-shaped surface on an upper surface and a lower surface, and has a plane on both sides (right and left sides in FIG. 3). The tip of the handle 2 is formed with an increasing portion 14 that gradually becomes thicker toward the tip. The base 10 of the head 4, which is formed integrally with the handle 2 at the tip of the handle 2, has an octagonal main portion 16 and protrusions 18 a and 18 b formed at both ends of the main portion 16.
And The side surfaces 20a and 20b of each of the protrusions 18a and 18b are cylindrical. The end surfaces of the protrusions 18a and 18b (ie, the lower surface of the protrusion 18a and the upper surface of the protrusion 18b) include first inclined surfaces 22a and 22b and second inclined surfaces 24a and 24b. First inclined surfaces 22a and 22b and second inclined surfaces 24a and 24
b between the curved surfaces 23a and 23
3b is present. The first inclined surfaces 22a and 22b are the handle 2
2 is a plane extending inclining in a direction approaching the longitudinal center axis 6 of the handle 2 (ie, going upward and downward in FIG. 2) as the distance from the handle 2 increases in the longitudinal direction of the handle 2 (that is, proceeds to the left in FIG. 2). , The second inclined surfaces 24a and 2
4b moves away from the handle 2 in the longitudinal direction of the handle 2 following the first inclined surfaces 22a and 22b (that is, proceeds to the left in FIG. 2), and moves away from the longitudinal central axis 6 of the handle 2 (ie, respectively in FIG. 2). It is a plane that extends obliquely in the directions (downward and upward). First inclined surfaces 22a and 2
2b and the second inclined surfaces 24b and 24b preferably form an angle θ of 100 to 150 degrees, particularly 115 to 125 degrees (the reason will be described later).
The handle 2 and the base 10 of the head 4 that are integrally formed can be formed from a suitable material such as steel having sufficient strength. A preferred material is chromium molybdenum steel, which can be easily removed by chemical polishing of the silicon surface, which is called etching, in a later step even if it is accidentally brought into contact with silicon to be crushed.

Each of the hitting portions 12a and 12b of the head 4 has cylindrical side surfaces 26a and 26b, and the outer diameter of the side surfaces 26a and 26b is equal to the outer diameter of the side surfaces 20a and 20b of the projecting portions 18a and 18b of the base 10. They are virtually identical. The base end surfaces of the hitting portions 12a and 12b (that is, the upper surface of the hitting portion 12a and the lower surface of the hitting portion 12b) include first inclined surfaces 28a and 28b and second inclined surfaces 30a and 30b. Between the first inclined surfaces 28a and 28b and the second inclined surfaces 30a and 30b, there are curved surfaces 29a and 29b that connect them smoothly. First slope 2
Reference numerals 8a and 28b denote planes corresponding to the first inclined surfaces 22a and 22b of the protruding portions 18a and 18b described above, and the handle 2 moves away from the handle 2 in the longitudinal direction of the handle 2 (ie, proceeds to the left in FIG. 2). The second inclined planes 30a and 30b extend in a direction approaching the longitudinal center axis 6 of the first (ie, upward and downward in FIG. 2).
Is the second inclined surface 24 of the projections 18a and 18b described above.
a and 24b corresponding to the first inclined surface 28
a and 28b, the direction of moving away from the handle 2 in the longitudinal direction of the handle 2 (that is, proceeding to the left in FIG. 2) and moving away from the longitudinal center axis 6 of the handle 2 (that is, going downward and upward in FIG. 2, respectively). It is inclined and extends. The curved surfaces 29a and 29b correspond to the curved surfaces 23a and 23b of the protrusions 18a and 18b described above. First slope 2
8a and 28b and the second inclined surfaces 30a and 30b form the angle θ described above. The tip surfaces 32a and 32b of the striking parts 12a and 12b advantageously form part of a spherical surface having a center of curvature on the longitudinal central axis 8 of the head 4. The radius of curvature R of the spherical surface is preferably 0.8L ≦ R ≦ 1.2L, where L is the length from the longitudinal center axis 6 of the handle 2 to the tips of the hitting portions 12a and 12b. . In the illustrated embodiment, R = L, so that the center of curvature of both tip surfaces 32a and 32b is the intersection of the longitudinal center axis 6 of handle 2 and the longitudinal center axis 8 of head 4. . It is important that the striking portions 12a and 12b, which are made to collide with the silicon mass to be crushed, are made of tungsten carbide, which hardly contaminates silicon even when it is brought into contact with silicon. Especially,
From the viewpoints of contamination to silicon and toughness against impact, it is preferable to use tungsten carbide containing 8 to 18% by weight, particularly 12 to 15% by weight of cobalt.

As can be seen from FIGS. 2 and 4, the striking portions 12a and 12b have first inclined surfaces 28a and 2b, respectively.
8b, curved surfaces 29a and 29b and second inclined surface 30a
And 30b are firmly connected to the base 10 by joining the first inclined surfaces 22a and 22b, the curved surfaces 23a and 23b, and the second inclined surfaces 24a and 24b of the projections 18a and 18b of the base 10. Preferably, such bonding is accomplished by brazing, with suitable brazing materials including silver wax. If desired, the striking portions 12a and 12b can be joined to the base 10 with a suitable adhesive such as a reactive synthetic resin adhesive.

The hammer constructed as described above is used by an operator in a manner similar to a nail hammer used in carpentry work by gripping the handle 2 and having dimensions suitable for such a usage pattern. Formed. To give an example of various dimensions, the total length FL of the hammer is 274 mm, the length HL of the handle 2 is 240 mm, and the total length BL of the head 4 is 100 mm.
The outer diameter OD of the hitting portions 12a and 12b is 32 mm,
The exposure length EL of the impact portions 12a and 12b is 16.5 mm
It is.

When the striking portions 12a and 12b of the hammer strike the silicon lump to break the silicon lump, the handle 2 made of a metal other than tungsten carbide is used.
And to ensure that the base 10 of the head 4 does not come into contact with the silicon mass or the crushed silicon pieces to be crushed, if desired, as shown in FIG. The base 10 of the head 4 can be wrapped with a suitable synthetic resin film 34 such as a vinyl chloride film.

According to the analysis of the inventor, when the operator crushes the silicon lump by colliding the hammer striking portion 12a with the silicon lump, the tip surface 32a of the hammering portion 12a forms a part of the ball surface. The reaction force applied to the striking portion 12a from the silicon mass normally acts toward the center of curvature of the tip end surface 32a of the striking portion 12a in an angle range of approximately 40 degrees indicated by α in FIG. Considering the case where the boundary region between the tip surface 32a and the side surface 26a of the impact portion 12a is made to collide with the silicon lump, the angular range of the reaction force acting on the impact portion 12a is somewhat widened, and the impact portion 12a, the base 10 and First slopes 22a and 28a and second slope 2 at the boundary of
4a and 30a, and thus curved surfaces 23a and 29a
The angle range is about 90 degrees indicated by β centered on the center line of (3). However, in a preferred embodiment of the hammer constructed according to the present invention, the angle θ between the first inclined surfaces 22a and 28a and the second inclined surfaces 24a and 30a is 100
Since the angle is set to 150 to 150 degrees, particularly 115 to 125 degrees, the reaction force acting on the hitting portion 12a as described above is applied to the main joint surface between the hitting portion 12a and the base 10 (that is, the first inclined surface 22a and the It does not act parallel to 28a and the second inclined surfaces 24a and 30a), but acts at a considerable angle (for example 20 to 110 degrees) to the main joint surface. Therefore, the reaction force acting on the striking portion 12a is
Is reliably received by the first inclined surface 22a and the second inclined surface 24a formed on the projecting portion 18a, and the joining of the striking portion 12a to the base 10 is short-term due to the reaction force acting on the striking portion 12a. It will not be damaged in time. The same applies to the case where the striking portion 12b collides with the silicon mass to be crushed, and the joining of the striking portion 12b to the base 10 is damaged in a short time due to the reaction force acting on the striking portion 12b. Nor.

FIG. 5 illustrates a variation of the hammer constructed according to the present invention. In the variant shown in FIG. 5, the projections 18a and 18 on the base 10 of the head 4
first inclined surfaces 22a and 22b defining the end surface of b
And the inclination directions of the second inclined surfaces 24a and 24b, the first inclined surfaces 22a and 22b and the second inclined surfaces 24a and 24b.
4b, the first inclined surfaces 28a and 28b and the second inclined surface 3 defining the bending directions of the curved surfaces 23a and 23b, and also the basal end surfaces of the hitting portions 12a and 12b.
0a and 30b, first inclined surfaces 28a and 2
The curved directions of the curved surfaces 29a and 29b connecting the 8b and the second inclined surfaces 30a and 30b are reversed from those of the hammer described with reference to FIGS. That is, in the modification shown in FIG.
2a and 22b and 28a and 28b move away from the longitudinal center axis 6 of the handle 2 as the distance from the handle 2 in the longitudinal direction of the handle 2 (ie, proceed to the left in FIG. 5) (ie, downward and upward in FIG. 5, respectively). And a second inclined surface 24a and 24b.
And 30a and 30b are first inclined surfaces 22a and 22
b and 28a and 28b, approaching the longitudinal center axis 6 of the handle 2 as it moves away from the handle 2 in the longitudinal direction of the handle 2 (ie, proceeds leftward in FIG. 5) (ie, goes upward and downward in FIG. 5, respectively). ) Is a plane extending inclining in the direction. The other configuration of the modification illustrated in FIG. 5 is substantially the same as the hammer described with reference to FIGS.

In the preferred embodiment described above and its modifications, the first inclined surfaces 22a, 22b, 28a and 28
b and the second inclined surfaces 24a, 24b, 30a and 30
b is a plane, but if desired, the first inclined surface and the second inclined surface can be curved if the processing steps become complicated. For example, the protrusions 18a and 189 of the base 10
The end face of b and the base end faces of the hitting portions 12a and 12b can be defined by a part of the spherical surface or the surface of a truncated cone. Even when the end surfaces of the protruding portions 18a and 18b of the base 10 and the base end surfaces of the hitting portions 12a and 12b are defined by such curved surfaces, the longitudinal center axis 6 of the handle 2 increases as the distance from the handle 2 increases in the longitudinal direction of the handle 2. A first inclined surface 22a which is a curved surface that extends in a direction approaching or away from the handle 2 and moves away from the handle 2 in the longitudinal direction of the handle 2 following the first slope (that is, proceeds to the left in FIG. 5). ), A second inclined surface which is a curved surface extending in a direction away from or approaching the longitudinal center axis 6 of the handle 2 is defined.

In the above-described preferred embodiment and its modification, the hitting portions 12a and 12b are provided at both ends of the base 10 of the head 4. If desired, the hitting portions are provided only at one end of the base 10. Can also be arranged.

[0021]

Although the hammer of the present invention can be manufactured relatively easily, it has sufficient durability, and sufficiently prevents silicon from being contaminated by impurities to form a silicon lump. For crushing, it can be conveniently used for an extended period of time.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a preferred embodiment of a hammer constructed according to the present invention.

FIG. 2 is a front view of the hammer of FIG. 1;

FIG. 3 is a right side view of the hammer of FIG. 1;

FIG. 4 is a plan view showing a part of the hammer of FIG. 1;

FIG. 5 is a front view showing a part of a modification of the hammer constituted according to the present invention.

[Explanation of symbols]

 2: handle 4: head 6: longitudinal center axis of handle 8: longitudinal center axis of head 10: base of head 12a: hitting portion 12b: hitting portion 22a: first inclined surface 22b: first inclined surface 24a : Second inclined surface 24b: second inclined surface 26a: side surface of the hitting portion 26b: side surface of the hitting portion 28a: first inclined surface 28b: first inclined surface 30a: second inclined surface 30b: second 32a: Tip surface of the hitting portion 32b: Tip surface of the hitting portion

Claims (7)

[Claims] An elongated handle and a head located at a tip of the handle and extending transversely to a longitudinal direction of the handle, the head being directly connected to the tip of the handle. A base portion and a hitting portion provided at least at one end of the base portion, wherein the hitting portion is made of tungsten carbide.The base portion and the hitting portion are formed in a longitudinal direction of the handle. A first inclined surface inclined in a direction approaching a longitudinal center line of the handle as the distance from the handle increases, and a longitudinal direction of the handle as the distance from the handle increases in the longitudinal direction of the handle following the first inclined surface. A hammer joined to each other via a boundary surface consisting of a second inclined surface inclined in a direction away from the center line. 2. A handle comprising an elongated handle and a head located at the tip of the handle and extending transversely to the longitudinal direction of the handle, the head being directly connected to the tip of the handle. A base portion and a hitting portion provided at least at one end of the base portion, wherein the hitting portion is made of tungsten carbide.The base portion and the hitting portion are formed in a longitudinal direction of the handle. A first inclined surface inclined in a direction away from a longitudinal center line of the handle as the distance from the handle increases, and a longitudinal direction of the handle as the distance from the handle increases in the longitudinal direction of the handle following the first inclined surface. A hammer that is joined to each other via a boundary surface including a second inclined surface inclined in a direction approaching the center line. 3. The hammer according to claim 1, wherein an angle formed by the first inclined surface and the second inclined surface is 100 to 150 degrees. 4. The hammer according to claim 1, wherein the first inclined surface and the second inclined surface are flat. 5. The handle and the base of the head are integrally formed of steel, and the striking portion is brazed to the base.
The hammer according to claim 1. 6. The hammer according to claim 1, wherein the hitting portion has a cylindrical side surface and a tip surface forming a part of a spherical surface. 7. The handle extends substantially straight, the head extends substantially straight and substantially perpendicular to the handle, and the striking portions are disposed at opposite ends of the base of the head. 7. The hammer according to claim 1, wherein the head is axisymmetric with respect to the longitudinal center axis of the handle.