JPS5828011B2 - Manufacturing method of graphite oil-free guide holder - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a guide holder that is fitted with a guide pin used in the upper and lower guides of a press mold, and a groove of an appropriate shape is provided on the inner sliding surface of the guide holder, and graphite is press-fitted into the guide holder. This invention relates to a manufacturing method for obtaining a guide holder that can be slid on without lubrication, and its purpose is to obtain a manufacturing method that allows graphite to be press-fitted into the inner diameter sliding surface of the guide holder at low cost and easily.

Conventionally, the guide holder that fits the guide pin used in the upper and lower guides of press molds is a graphite oil-free guide holder that has graphite, which is a solid lubricant, embedded in the inner diameter sliding surface of the guide holder to eliminate abnormal wear caused by sliding friction. has been used.

However, various methods have been proposed for embedding graphite in the inner diameter sliding surface of the guide holder, but all of them require the addition of a binder that impedes the lubricating effect of graphite, or the mixing ratio with the binder must be lowered. Unfortunately, the lubricating properties of graphite could not be fully utilized, and the function of a guide holder in a press mold could not be fully satisfied.

The present invention eliminates these conventional drawbacks,
A method for easily press-fitting graphite into the groove of a guide holder can be obtained without adding a binder that does not impede the lubricating effect of graphite and without reducing the graphite ratio.

The guide holder created in this way forms a solid lubricant film of graphite crystals on the sliding surface due to the lubricating effect of graphite, and can slide without lubrication without the need for grease or the like. It has the advantage of eliminating the hassle of refueling moving parts.

The present invention will be explained based on the drawings. In FIG. 1, a spiral groove 3 is formed on the inner diameter sliding surface 2 of a guide holder 1 made of a suitable bearing metal.

Here, the guide holder 1 is made of FC-25 as a reference example, but any other bearing metal may be used.

In this reference, the groove 3 is spiral-shaped, but the groove may have a circular crown shape or a plurality of small diameter holes interspersed therein, and the cross-sectional shape of the groove may be of any shape.

In the past, the grooves 3 of the callus were formed by lathe machining in the cited example, but any other machining method such as casting or electric discharge machining may be used.

In FIG. 2, the graphite column 4 is manufactured by using graphite as a main component and adding a small amount of a suitable binder thereto and heating and pressurizing the mixture.

In the cited example, a mixture of graphite and epoxy resin as a binder in a weight ratio of 5 parts and 1 part was placed in a cylindrical mold at 120'C20.
kg/cr? In other words, graphite accounts for 95% (weight ratio), and the lubricating effect of graphite is not impaired because of the epoxy resin.

The volume of this graphite column 4 is the inner diameter sliding surface 2 of the guide holder 1.
The inner diameter is larger than the inner diameter volume (including the volume of the groove 30) surrounded by the guide holder 1, and its outer diameter is such that it fits into the inner diameter of the guide holder 1.

This graphite column 4 is inserted into the inner diameter sliding surface 2 of the guide holder 1 as shown in FIG.

In this state, apply pressure from above.

This pressurization causes the graphite column 4 to be crushed as it enters the groove 3 of the guide holder 1 and is fixed therein.

In this case, if an adhesive is applied to the groove 3, the fixing will be more effective.

In the cited example, the pressing force was 50 kg/i, but the graphite was evenly press-fitted into the grooves 3.

In this way, graphite is press-fitted into the groove 3 of the guide holder 1.

Therefore, there is no need to mix large amounts of binder with graphite.
In addition, graphite can be press-fitted into the groove 3 without lowering the mixing ratio of graphite and binder.

The graphite column 4 embedded in the groove 3 of the guide holder 1 is removed by machining by scraping off the graphite in the portion of the inner diameter sliding surface that does not fit into the groove.
It is possible to obtain a guide holder 1 in which a graphite column 4 is embedded in a groove 3 as shown in the figure, and the inner diameter is finished.

As explained above, the present invention provides an effective manufacturing method for embedding a solid lubricant mainly composed of graphite in the groove 3 of the inner sliding surface 2 of the guide holder 1 in a press mold. be able to.

[Brief explanation of drawings]

Figure 1 shows the guide holder 1 before press-fitting the graphite, Figure 2 shows the graphite column 4 inserted into the guide holder 1, and Figure 3 shows the graphite column 4 inserted into the inner diameter of the guide holder 1. A sectional view showing the area where pressure is applied from above, and FIG. 4 is a sleeping room showing the completed product. 1... Guide holder, 2... Inner diameter sliding surface, 3...
・Groove, 4...graphite column, P...pressure force.

Claims (1)

[Claims] 1. A groove of an appropriate shape such as a spiral or a thank-you note is provided on the inner diameter sliding surface of a guide holder made of a suitable bearing metal,
A graphite column made by mixing a binder made of epoxy resin is inserted into the inner sliding surface, and the graphite column is pressurized from above to be press-fitted into the groove, and then inside the inner sliding surface. A method for manufacturing a graphite oil-free guide holder characterized by finishing the graphite by removing graphite that does not fit into the groove by machining.