JPS63306845A - Sign bar - Google Patents

Abstract

PURPOSE:To reduce the cost of a sign bar by forming the first R-shaped portion at the corner of the base of a sign bar body and the second R-shaped portion having the same configuration and direction as those of the first R-shaped portion the base of this body at a predetermined distance from the first R- shaped portion. CONSTITUTION:The first R-shaped face 1a is formed at the corner of the base of a wholly nearly rectangular sign bar body 1 having a measuring face on its upper face 1d. Further the second R-shaped portion 1b is formed integrally with this body 1 on the base of this body 1 at a predetermined distance from the first R-shaped portion 1a. this second R-shaped portion 1b has the same configuration and direction as those of the first R-shaped portion 1a. The base in the middle area on between the first R-shaped portion 1a and the second R-shaped portion 1b is formed as the inclined face by an angle of 5 degree to the upper face 1d. Thus the R-shaped portions 1a, 1b are formed so that the number of parts of the sign bar is single, and the manufacturing cost is reduced and accuracy is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sine bar that shortens processing setup time for milling machines and grinding machines and facilitates high-precision angle cutting.

[Conventional technology]

Conventionally, when cutting angles in machining using a milling machine, etc., a parallel high-speed steel fixed on the workbench of the milling machine was transferred to an angle vise to secure the workpiece, and the workpiece was set at a predetermined angle before machining. At this time, for those with strict precision, it was necessary to check the angle using a sine bar, dial gauge, etc. after setting the angle scale.

Furthermore, when setting up one workpiece, it takes a considerable amount of time just to remove the parallel vise and replace it with the angle vise midway through. Furthermore, conventional sine bars are difficult to use during processing and are expensive, so they are not used much at present.

Figure 7 shows the conventional sign bar (JIS B 7523)
It shows. This has steel rollers 12.13 fixed to both sides of the bottom of a steel body 11 with bolts 17, and the center distance between the rollers 12.13 is set to 100 mm or 2.
00+m, and when the roller is placed on the reference surface, the main body 11
The upper surface 14 of is configured to be parallel to the reference plane. For example, when trying to obtain an angle of 30 degrees using a sine bar with a nominal size of 100 marks, as shown in FIG.
A reference height of 0+nm is created, and one roller 12 of the sine bar is placed on the surface plate 15 and the other roller 13 is placed on the block gauge 16. The inclination of the upper surface 14 at this time is θ
= sirr'<50 mm/10 (1 mm) = 3Q degrees.

Generally, the height of the block gauge 16 is h (ma+)
In order to find the angle θ, h = 100・sin θ 11. s).

In this way, the desired angle can be obtained with the sine bar, but since the sine bar is a precision tool, it is currently used only for inspecting and verifying the workpiece after machining. .

[Problem that the invention seeks to solve]

A sign bar with such a conventional structure has a main body 11 and two rollers 12, as shown in FIG. 13 three B+
,! The roller 12. is constructed by combining the rollers 12. When wear occurs on the tool 13, there is a problem that the error becomes large with respect to the nominal size, and the tool cannot be used as a reference tool.

The present invention was devised in view of such conventional problems, and an object of the present invention is to provide a low-cost and highly accurate sine bar.

[Means for solving problems]

In order to achieve this object, the sine bar of the present invention has a first rounded portion formed at the corner of the bottom of the sine bar main body, which is a substantially rectangular parallelepiped whose upper surface is the measurement surface. , having the same shape and direction as the first rounded portion, and having a constant distance from the first rounded portion.
The bar is characterized by being formed integrally with the sine bar main body.

By forming an inclined surface at an angle of 5 degrees with respect to the top surface on the bottom surface between the first rounded part and the second rounded part, generally the lower limit of the angle is 5 degrees and the upper limit is An angle of 85 degrees can be obtained without requiring any other angle gauge.

Further, by providing a bolt hole for attaching the stopper on the top surface of the sine bar main body, when the workpiece is fixed by a parallel vise, the workpiece can be placed on the sine bar and set at a predetermined angle.

〔Example〕

Hereinafter, the present invention will be specifically described based on embodiments shown in the drawings.

FIG. 1 shows an embodiment of the sine bar of the present invention.
(a) is a plan view, (c) is a front view, and (c) is a side view. The sine bar main body 1 has a roughly rectangular parallelepiped shape, and the bottom surface has a first rounded part 1a at the corner and a predetermined distance from the first rounded part 1a, that is, a nominal dimension of 100a++a or 100a++a. A second radius Ilb is formed 200 fins away.

This first radius B 1 a and the east 2 radius 1b g
The distance is expressed as a parallel distance measured within approximately 90 degrees of the rounded portion, and it is convenient for calculation to use 50 mm or 100 mm or an integral multiple thereof as the nominal dimension. It is easy to read this nominal dimension by stamping it on the front of the sign bar body 1. The first radius portion 1a and the 20th radius Ifr! , lb, an inclined surface IC having an angle of 5 degrees is formed. The upper surface ld is formed so as to be parallel to the reference plane when the first radiused portion 1a and the second radiused portion 1b are bent so as to touch the reference plane. Stoppers 2 shown in FIG. 2 are provided on the top surface 1d and side surface 1e, respectively.
A bolt hole if is provided for fixing with a bolt. Further, in the vicinity of the second rounded portion 1b, there is a cutout portion 1g.
is provided so that the extended surface of the second rounded portion 1b and the inclined surface IC is perpendicular to each other.

The stopper 2 shown in FIG. 2 is provided with a long hole 2a, so that its position can be adjusted when it is fixed to the sign bar main body l with a bolt.

FIG. 3 shows an example of its use. A case will be described in which the distance between the first radiused portion la and the second radiused portion 1b in the sine bar body 1 of this embodiment is 5011II11, and the tip of the workpiece 4 is cut at an angle of 30 degrees. In this case, the height h of the block gauge 3 is determined as follows.

h = &sin θ = 50 sin 30° = 25 Based on this calculation, the height of the block gauge 3 is set to 25 mm, and the sine bar body 1 is placed on it. Fix the collar 2 to the side of the sine bar body 1 with bolts, and place the workpiece 4 on the top surface 1 of the sine bar body 1 so that the end surface touches this stopper 2.
Place it on d and set it. The workpiece 4 is now set on the surface plate with an inclination of 30 degrees. Thereafter, the workpiece 4 is clamped in this state using a parallel vise, and processed using a turning tool.

FIG. 4 shows the 5
This shows a state in which the workpiece 4 is set at a degree angle. In the figure, 5 is a parallel stand for a vice, and the inclined surface IC of the sign bar main body 1 is placed on this parallel stand 5 and set.

Further, FIG. 5 shows a state in which the workpiece 4 is set at an angle of 85 degrees. In this case, an end face stopper 6 on the side surface of the vice cap is used so that the inclined surface IC of the sign bar main body 1 is brought into close contact with the end face stopper 6.

In the examples shown in FIGS. 4 and 5, a block gauge is not required, and the height of the workpiece 4 can be adjusted by adjusting the tightening position of the stopper 2.

If you do not use a high speed steel, as shown in Fig. 6, attach the cutout i1FI of the sign bar body 1 to
It can be fixed with bolt 8 using s1g.

Other uses include scribing work and angle grinding with a polishing machine, ensuring precision.

If the 5-degree inclined surface IC of this embodiment is used, an angle gauge of a right triangle with an apex angle of 15 degrees/75 degrees, an angle gauge of a right triangle with an apex angle of 30 degrees/60 degrees, and an angle gauge of a right triangle with an apex angle of 45 degrees/ 4
By using a 5 degree right isosceles triangle angle gauge in combination, it is possible to measure angles from 5 degrees to 85 degrees in 5 degree increments.

〔Effect of the invention〕

As explained above, in the present invention, since the distance between the first rounded part and the second rounded part provided on the bottom surface of the sine bar body is set as the reference dimension, the sine bar is Compared to a sine gauge that combines a main body and two rollers, it requires only one part, so manufacturing costs are low and accuracy can be achieved. Furthermore, even if the rounded portions become worn, they can be reused by simply polishing them so that the distance between the two rounded portions does not change. Therefore, it can be used for a long period of time.

[Brief explanation of the drawing]

FIG. 1 shows the shape of an embodiment of the present invention, and (a
) is a plan view, (b) is a front view, and (C) is a side view. FIG. 2 shows the shape of the stopper, in which (a) is a plan view, (b) is a front view, and (C) is a side view. FIG. 3 is a front view showing how to use the present invention. Figures 4 to 6
Each figure is a front view showing another method of using the present invention. FIG. 7 is a front view of a conventional sign bar, and FIG. 8 is a diagram showing a typical example of its use. 1: Sign bar main body 1a: First rounded part 1b:
20th R section IC: Inclined surface ld: Top surface
1e: Side lr: Bolt hole 1g:
Notch 2: Stopper 3 Ni block gauge 4: Workpiece 5: Parallel stand for vise 6° Vise end face stopper Patent applicant MMT Co., Ltd. Representative Masu Kobori (and 2 others) No.
1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A first rounded portion is formed at the corner of the bottom of a sine bar main body that is a substantially rectangular parallelepiped whose top surface is the measurement surface, and the first rounded portion is formed on the bottom surface of the sine bar main body. A sine bar, characterized in that a second radiused portion having the same shape and direction as the first curved portion and a constant distance from the first radiused portion is formed integrally with the sine bar body. 2. The sine bar according to claim 1, characterized in that an inclined surface at an angle of 5 degrees with respect to the top surface is formed on the bottom surface at an intermediate point between the first radiused portion and the second radiused portion. . 3. The sign bar according to claim 1 or 2, characterized in that a bolt hole for attaching a stopper is provided on the top surface.