JPH039902Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention has been created to suitably maintain a constant distance between the torch and the workpiece when performing non-contact cutting with a plasma torch. It is related to jigs.

[Prior Art] Cutting methods using a plasma torch include contact cutting and non-contact cutting. In contact cutting, the output current range that can cut while the nozzle is in direct contact with the base material is generally 30A due to parts wear and tear at the tip of the torch.
The cutting thickness is limited to the following, and the cutting thickness is also for thin plates. For larger capacities, non-contact cutting is required to create a gap between the base material and the nozzle. When performing non-contact cutting, the distance between the nozzle tip of the plasma torch and the workpiece to be cut must be kept constant. Maintaining a constant spacing like this requires a high level of skill.

[Problem that the invention aims to solve] It is a well-known method in various technical fields that in order to maintain a constant spacing without requiring skill, it is sufficient to insert some kind of spacer, but it is a well-known method in various technical fields. There are special conditions for cutting by.

For example, in a general gas cutting torch, a screw-in spacer is known to maintain a constant distance between the nozzle tip and the member to be cut. However, in a plasma torch, contact cutting must be performed as necessary, so a screw-in spacer that takes time to attach and detach is extremely inconvenient in practice.

This idea was created in view of the above circumstances.
The present invention aims to provide a jig that is quick and easy to attach and detach, and is suitable for non-contact cutting with a plasma torch.

[Means for Solving the Problems] In order to achieve the above object, the cutting jig of the present invention includes a cylindrical wound spring member having an inner diameter smaller than the outer diameter of the plasma torch body when not receiving external force. is made of a material having heat resistance of at least 300°C, and is provided with a pair of tongue pieces each having both ends of the coiled spring member bent outward, respectively,
Further, when the coiled spring member is fitted onto the plasma torch main body, a leg member extending below the nozzle of the plasma torch is integrally provided, and the lower end edge of the leg member is formed in an arc shape. Features. The reason why heat resistance of 300℃ or higher is required is that the temperature of the torch body rises due to secondary heat radiation from the base material.As a material that satisfies this condition,
For example, there is tempered spring steel.

[Operation] In the jig configured as described above, when the pair of tongues are pinched between fingertips, the inner diameter of the cylindrical coiled spring portion is enlarged, so that the plasma torch main body can be freely inserted and removed. When the fingertip is relaxed with the plasma torch main body inserted, the inner diameter of the coiled spring portion contracts and is firmly fitted to the plasma torch main body. In this way, this jig can be attached to and detached from the plasma torch body.

When the tips of the leg members are brought into contact with the surface of the member to be cut, the distance between the nozzle tip of the plasma torch and the member to be cut is maintained constant.

Moreover, since the tips of the leg members are formed in an arc shape, they can be slid smoothly along the surface of the member to be cut.

[Example] Fig. 1 is a perspective view of a cutting jig 1 according to the present invention;
FIG. 2 is a perspective view of the jig 1 of the above embodiment attached to the torch main body 2.

As shown in FIG. 2, the outer diameter of the torch body 2 is assumed to be D. A nozzle 3 is installed at the tip of the torch body 2.
The torch body 2 is attached to the tip of the torch grip 4.

As shown in FIG. 1, the jig 1 has a structure in which a pair of legs 1b are integrally provided below a cylindrical coiled spring portion 1a.

Free state where no external force can be applied (Figure 1)
In this case, the inner diameter d of the coiled spring-like portion 1a is configured to be smaller than the dimension D described above.

In this example, the coiled spring-like portion 1a is formed by processing a stainless steel plate into one turn, then wrapping the W portion shown in the figure overlapping each other, and further extending the tip portions 1a _-1 and 1a _-2 outward (that is, into a cylindrical shape). ) to form a pair of tongues.

If you pinch the pair of tongues 1a _-1 and 1a _-2 with your fingertips and apply force in the directions of arrows A and A', the tongues 1
a _-1 and 1a _-2 are pushed in the directions of chain arrows a and a', respectively, and the inner diameter d of the coiled spring-like portion 1a is expanded.

When the inner diameter dimension is expanded by the above operation, the inner diameter dimension in the expanded state is the outer diameter dimension D (Fig. 2).
The related dimensions and shape are set in advance so that it is larger than .

FIG. 3 shows a partial front view seen in the direction of the arrow shown in FIG. 2.

The tip of the leg 1b is the member to be cut (indicated by a virtual line) 5
When it is lightly pressed against the surface of the nozzle 3, the distance between the tip of the nozzle 3 and the member to be cut 5 is maintained at the length L shown in the drawing.

The tip of the leg 1b is formed into an arc shape with a radius r, as shown in FIG. Therefore, the leg 1
It is easy to move b smoothly along the member to be cut 5 as shown by arrow e or f in the figure.

[Effects of the invention] As detailed above, the jig of the invention can be quickly and easily attached to and removed from a plasma torch, and can maintain a constant distance between the nozzle tip of the torch and the workpiece to be cut. , the torch can be smoothly moved parallel to the surface of the member to be cut.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the cutting jig of the present invention, and FIG. 2 is a perspective view of the jig of the above embodiment attached to a torch body. FIG. 3 is a partial front view seen in the direction of the arrow in FIG. 2, and FIG. 4 is an explanatory diagram of the shape of the tip of the leg. 1... Jig, 1a... Helical spring-like part, 1a _-1 , 1a _-2 ...
Tongue piece, 1b...leg, 2...torch body, 3...nozzle.

Claims (1)

[Scope of utility model registration request] A cylindrical coiled spring member having an inner diameter smaller than the outer diameter of the plasma torch body when not subjected to external force is made of a material having heat resistance of at least 300°C, and both ends of the coiled spring member are A pair of tongue pieces are provided that are bent outward.
Further, when the coiled spring member is fitted onto the plasma torch main body, a leg member extending below the nozzle of the plasma torch is integrally provided, and the lower end edge of the leg member is formed in an arc shape. A jig for non-contact cutting using a plasma torch.