JPS6036621A - Surface hardening method of blade part of press die member - Google Patents

Abstract

PURPOSE:To subject quickly and stably the blade parts of a press die to quench hardening to high hardness by positioning the blade parts to face each other at a small spece in an overlapped state and passing high frequency current thereto. CONSTITUTION:Members 1, 2 constituting the blade parts of upper and lower dies in a press die are positioned to face each other at 2mm. space and are disposed in such a way that the blade parts facing each other overlap at 5mm.. Both members are connected on one side electrically by an electrode plate 3 having good current-conductive and wear-resistant electrodes 4, 5 and are connected on the other side to a high frequency power source 11 by lead plates 6, 7 having wear resistant electrodes 8, 9. High frequency current of 100kHz frequency is conducted at 10.5 ampere for 5sec to said electrodes from a power source 11 in this stage. A surface hardened layer is easily formed by quench hardening to both blade parts 1, 2 of the press die.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for hardening the surface of a press mold member blade,
Specifically, the M plate is used for press forming such as bending and punching. The upper mold of the press mold and the mold member blade part corresponding to T10 (11) are made into a part of the f'FJ frequency heating coil, and the press mold member blade part is hardened by 1-current induction hardening. It takes a surface hardening method.

Conventionally, in press forming such as bending and punching of steel plates, IB was used for press forming such as bending and punching of 44 plates.
be involved. 9 Hardfacing and flame hardening are mainly used as surface hardening methods to improve the wear resistance of press mold member blades, but hardfacing is a manual process and requires expensive welding rods. The disadvantage is that not only is the hardfacing process and time required, but the hardfacing cost is also high.

On the other hand, surface hardening by flame quenching can be done relatively inexpensively, but currently the quenching method shown in Figure i1 is used, so it is difficult to adjust the moving speed of the pener, and the quenching process is difficult. Not only is it a manual process, but it is also a highly skilled process that relies heavily on the experience of the operator to determine the quenching temperature, so it has the disadvantage that it is difficult to obtain stable quench-hardening treatment quality. be.

By the way, from the viewpoint of increasing the efficiency of the quench hardening process and stabilizing the quench hardening quality, induction hardening has also been attempted as a surface hardening means for reducing the wear tendency of the press mold member blade part. However, with normal induction hardening, it is not only expensive to manufacture the electrodes.

Due to the special nature of press mold parts, in which products with the same shape are rarely manufactured, it is not possible to induction harden many mold parts with one electrode, and as a result, the induction hardening process is difficult. The disadvantage is that it is expensive.

The present invention solves the above-mentioned problems in the conventional method of surface hardening the blade portion of a press mold member, and the upper mold and the lower mold of the press mold are made to correspond to each other.

By providing a slight interval between the blade parts of the press mold members and facing each other with the parts to be quenched and hardened overlapped, it is possible to form a part of the high-frequency heating coil. Quick and stable quench hardening quality. Maybe Gino, it's cheap.

The object of the present invention is to provide a method for surface hardening the blade portion of a press mold member.

According to the present invention, this object is used for press forming such as bending, punching, etc. of the 114 plate. 9. Surface hardening method for improving abrasion resistance of press mold member blades, including upper and lower molds of the press mold.

A small gap is provided between the blades of the corresponding press mold members that are to be surface hardened, and the areas to be quench hardened are placed facing each other in an overlapping state. The nine press mold members are electrically connected by fixing a highly conductive electrode, and the other end is electrically conductive to each press mold member by insulating the press mold members. By fixing electrodes with good resistance, the corresponding blades of the press mold members of the upper and lower molds can be made into a part of a solar thermal coil, and by passing a high frequency current through them. , is achieved by the surface hardening method of the press mold member blade portion, which is characterized in that the upper mold of the press mold and the press mold member blade portion of the upper mold are simultaneously surface hardened by one current induction hardening. .

Hereinafter, one embodiment of the present invention will be described in detail based on the accompanying drawings.

Consists of press mold member blade. The second hardened coil configuration
Figure 3 shows the 1-current quenching state.

In FIG. 2, press mold members 1 and 2 are.

These are corresponding blade portions of the upper die and lower die of the press mold, respectively.

The electrode 3 connects one end of the press mold members 1 and 2.

It is a copper plate that is electrically connected to press mold members 1 and 2.
Electrodes 4 and 5, which have good wear resistance and conductivity, are arranged at the portions that come into contact with the electrodes.

Further, the lead plates 6 and 7 connected to the high frequency power supply are electrically connected to the other ends of the press mold members 1 and 2, respectively, via electrodes 8 and 9, which have good wear resistance and conductivity. It is connected to the.

5- Note that the lead plates 6 and 7 are insulated by an insulating plate 10.

Under the above configuration, first, the blade portions of the press mold members 1 and 2 are opposed to each other with an interval of 2 mm, and.

The overlap between the corresponding blade parts is set to 5 mm, and the electrode 3. The lead plates 6 and 7 are brought into contact with the side surfaces of the press mold members 1 and 2 under a suppressed load of 30I (g).

Next, the lead plates 6 and 7 are connected to a high frequency oscillator (output: 1
50KW) and 9 frequencies; 100 KHz.

Plate voltage, 10KV, plate current, 10.5A.

By passing a high-frequency current in the direction of the arrow under the conditions of energization time: 5 seconds, current flows through the blades of the press mold members 1 and 2 as shown by the arrows in FIG. 3, and the press mold part 1 A surface hardening layer is formed on the blade portions of and 2 by quench hardening, as shown in A shown in FIG.

In this example, the length of the blade portions of the press mold members 1 and 2 was set to +200 mm, but even if the length of the blade portions (press mold members) is changed, the electrode 6-3 and lead plate 6 are the same. and 7, it is possible to perform φ hardening.

Figure 5 also shows the blade part that is integrated with the press die.
This is an example of induction hardening, but in this case as well, the shape of coil 3 (6) is not changed.

Quench hardening is the most important feature.

As is clear from the above, according to the method for surface hardening the press mold %li material blade portion according to the present invention, the press mold member blade portions of the press mold upper die and the soil tank are The part to be hardened by quenching is set at a slight interval, and by overlapping γ and facing each other in a t-column state, the press mold member itself becomes part of the induction hardening fill and is subjected to 9 energization induction hardening. By doing so, the blade parts of the corresponding press mold members were simultaneously quickly and stably quenched and hardened. In addition, there is one point: 4. The abrasion-resistant surface hardening of the press mold part (blade part) can be done at low cost.

[Brief explanation of the drawing]

Figure 1 shows conventional flame hardening. The figure which shows the surface hardening treatment method of a press mold member. FIG. 2 is a diagram showing the configuration of an induction hardening coil of the blade portion of a press mold member according to the method of the present invention. FIG. 3 is a diagram showing the =m quenching state according to the method of the present invention. FIG. 4 is a diagram showing a pattern surface-cured by the method of the present invention. FIG. 5 is a diagram showing an example in which the blade portion integrated with the press die is hardened by one-pass electric sieve frequency quenching. 1.2...Press mold member, 3,4.5.xllIiI
. 6.7. Lead grain, 8, 9...electrode, 10...absolute ball plate. 1] ・High frequency oscillator, A-cloth Φ1 customization layer application person Toyota Motor J4 Co., Ltd. Figure 1 Figure 4 Figure 5

Claims (1)

[Claims] 1. Used for press forming such as bending and punching of steel plates. 1 surface hardening method of Nodame for the abrasion resistance of the blade part of press mold member,
A small gap is provided between the blades of the corresponding press mold members that are to be surface hardened, and the areas to be quench hardened are placed facing each other in an overlapping state. One press mold member is electrically connected by fixing a highly conductive electrode, and the other end is electrically conductive to each press mold member by insulating each press mold member. By fixing electrodes with good resistance to each other, the corresponding press mold member blades of the upper and lower molds become part of a high-frequency heating coil, and by passing a high-frequency current through them, the above-mentioned effect can be achieved. A method for surface hardening a press mold member blade portion, comprising simultaneously surface hardening the press mold member blade portions of an upper die and a lower die of a press die by 9 times of current induction hardening.