JP3012262U - Holder split die - Google Patents

Abstract

(57) [Summary] [Purpose] A large amount of pressure is applied to the mold member to extend the life of the mold member. [Structure] In a holder split die in which an upper holder 1 having a mold member 3 exchangeably provided in the center and a lower holder 5 having a knockout pin insertion hole 7 penetratingly opened in the center are bolted so as to be separable, the mold member 3 Is formed by press-fitting a nib 31 having a die hole 30 and an outer periphery having a tapered surface into a tapered sleeve 32, and seizure-resistant surface modification layer 3 on both inner and outer surfaces of the sleeve 32.
3, 34 are formed. Therefore, even if the press-fitting margin of the nib 31 is increased to form the mold member 3 and the press-fitting margin of the mold member 3 is further increased to press-fit into the mold setting hole 10 of the upper holder 1, seizure does not occur. The pressure applied to the nib 31 can be increased, and the life can be extended.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a die used for forging and press forming various industrial machine parts such as bolts, nuts and automobile parts.

[0002]

[Prior art]

 Conventionally, as shown in FIG. 5, an upper holder (1) having a mold member (3) exchangeably provided at the center and a lower holder (5) having a knockout pin insertion hole (7) opened at the center are attached to a bolt ( According to 8), a holder split die is proposed which is clamped and fixed so as to be split. This holder split die separates the upper holder (1) and replaces only the die member (3) of the upper holder (1) when the die member (3) has reached the end of its life. 5) has the advantage that it can be used for a long time.

The life of the die member (3) is greatly affected by elastic deformation when the pressurization of forging and forging repeatedly acts, so that the die member (3) must endure the pressure during forging and forging. ) Must be press-fitted into the die set hole (10) of the upper holder (1) in a tightly fitted state, and a high preload must be applied to cancel the large pressure during forging and forging to extend the life of the die. However, it is unavoidable that the tightening force on the mold member (3) escapes to some extent by the deformation of the mold hole (30) and the tightening margin is reduced.

In recent years, for the purpose of reducing the product cost, improving the strength of the product, and the like, it has been attempted to manufacture parts by forging and forging. Therefore, the mold hole shape of the mold member (3) is diversified, and for example, As shown in FIG. 3, an elongated hole-shaped die hole (30) is also appearing in the direction orthogonal to the axis of the die member (3).

[0005]

[Problems to be solved by the device]

 In this case, as shown in FIG. 4, the mold member (3) is press-fitted or shrink-fitted into the mold setting hole (10) of the upper holder (1) to form a uniform tightening margin around the entire circumference of the mold member (3). If given, the stress release on the long side of the die hole (30) becomes larger than the stress release on the short side, and the long side escapes inward and swells, thereby tightening the die member (3). Of course, the outer circumference of the mold member (3) corresponding to the long side of the mold hole (30) and that for the short side of the mold hole (30) become uneven in the interference and the mold member ( It was not possible to apply pressure to 3) effectively. The present invention clarifies a holder split die that can minimize the influence of the mold hole shape of the mold member and give a large preload to the mold member to extend the life of the mold member. Is.

[0006]

[Means for solving the problem]

 The holder split die according to the present invention is capable of splitting an upper holder (1) having a mold member (3) at the center thereof and a lower holder (5) having a knockout pin insertion hole (7) at the center thereof. In the holder divided die which is bolted to, the mold member (3) has a mold hole (30), and the nib (31) having a tapered outer periphery is press-fitted into the tapered sleeve (32). At least one of the mating surfaces of the sleeve (32) and the nib (31) and at least one of the mating surfaces of the sleeve (32) and the upper holder (1) are made of TiC. , TiCN, TiN, etc. are formed to have seizure-resistant surface modification layers (33) (34).

[0007]

[Action and effect]

 At least one of the mating surfaces of the sleeve (32) and the nib (31) and at least one of the mating surfaces of the sleeve (32) and the upper holder (1). Has a seizure-resistant surface modification layer (33) (34) such as TiC, TiCN, TiN, etc., so the press-fitting margin of the nib (31) is increased to form the mold member (3). Moreover, even if the press-fitting margin of this mold member (3) is increased and press-fitted into the mold set hole (10) of the upper holder (1), seizure does not occur and the pressurizing force on the nib (31) is higher than before. It can be made larger and the life can be extended.

[0008]

Embodiment As shown in FIGS. 1 and 2, the upper holder (1) has a mold member (3) press-fitted into a mold setting hole (10) at the center thereof. The mold setting hole (10) is a taper hole whose tip side is reduced in diameter. The upper holder (1) is made of hardened steel having high tensile strength. The mold member (3) is constructed by press-fitting a nib (31) made of cemented carbide into a tapered sleeve (32) made of special steel. Replace the mold member (3) with the sleeve (32). At the center of the nib (31), a long hole-shaped die hole (30) is formed in a direction orthogonal to the axis, and the outer periphery of the nib (31) is formed into a tapered surface.

A seizure-resistant surface-modified layer (33) (34) (exaggerated by a thick line) of TiC, TiCN, TiN or the like is formed on the inner and outer peripheral surfaces of the nib (31). There is. The surface modification layer (33) (34) is a layer of TiC or TiCN formed by chemical vapor deposition (CVD) or a layer of TiN formed by physical vapor deposition (PVD). The surface modification layer (33) (34) is It penetrates into the metal fabric and partially bonds, and its thickness is 5 to 10 μm.

On the back surface of the upper holder (1), four screw holes (11) (11) are opened at equal intervals in the circumferential direction corresponding to the corners of the mold hole (30). The lower holder (5) is provided with a bolt insertion hole (51) parallel to the shaft center at a position corresponding to the screw hole (11) of the upper holder (1), and a die is clamped on the outer surface of the die block. Forming a slanting contact surface (57) against which the tip of a clamp bolt (not shown) to be pushed. Further, a knockout pin insertion hole (7) is opened through the shaft core of the lower holder (5), and the knockout pin insertion hole (7) communicates with the mold hole (30) of the mold member (3). There is.

A circular concave portion (4) is formed in the center of the lower holder (5) on the opposing surfaces of the upper holder (1) and the lower holder (5), and the concave portion is formed in the center of the upper holder (1). A convex portion (6) is formed which fits tightly with (4). Regarding the dimensional relationship between the protruding height of the convex portion (6) and the depth of the concave portion (4), the upper holder (1) with the tip surface of the convex portion (6) in contact with the bottom surface of the concave portion (4). And the lower holder (5) has a slight gap around the outer circumference. Positioning pins (56) and receiving holes (12) are formed on the outer peripheral sides of the facing surfaces of the upper holder (1) and the lower holder (5) for fitting with each other to determine the phase of the mold hole (30). There is.

Then, the mold member (3) formed by pressing the nib (31) into the sleeve (32) is pressed into the mold setting hole (10) of the upper holder (1). The upper holder (1) is put on the lower holder (5), the positioning pin (56) and the receiving hole (12) are fitted to each other, and the bolt (5) inserted through the bolt insertion hole (51) of the lower holder (5) is inserted. 8) Assemble the die by tightening the upper holder (1) and the lower holder (5).

Since the seizure-resistant surface modification layers (33) (34) such as TiC, TiCN, and TiN are formed on the outer surface of the sleeve (32), the press fitting margin of the nib (31) is increased. Forming a mold member (3) and further increasing the press-fitting margin of this mold member (3) into the mold set hole (10) of the upper holder (1), seizure does not occur, and the nib (31 ) Can be increased and the life can be extended.

In carrying out the present invention, the shape of the mold cavity (30) of the nib (31) does not matter. Further, in carrying out the present invention, a seizure-resistant surface-modified layer of TiC, TiCN, TiN or the like is formed on the outer peripheral surface of the nib (31) and the hole surface of the mold setting hole (10) of the upper holder (1). Then, even if the surface modification layer on the outer surface of the sleeve (32) is omitted, the same effect as described above can be obtained. In short, the sleeve (32), the nib (31) and at least one of the fitting surfaces of each other, and the sleeve (32) and at least one of the fitting surfaces of the upper holder (1). It is only necessary to form a seizure-resistant surface modification layer (33) (34) such as TiC, TiCN, or TiN. The present invention is not limited to the configuration of the above embodiment, and various modifications can be made within the scope of the claims.

[Brief description of drawings]

FIG. 1 is a sectional view of a die.

FIG. 2 is a perspective view showing a state where an upper holder and a lower holder are separated.

FIG. 3 is a perspective view of an upper holder on which a mold member is set.

FIG. 4 is an explanatory view exaggerating the deformation of the mold cavity.

FIG. 5 is a perspective view of a conventional example.

[Explanation of symbols]

 (1) Upper holder (3) Type (31) Nib (32) Sleeve (5) Lower holder

Claims (1)

[Scope of utility model registration request] 1. An upper holder (1) having a mold member (3) exchangeable in the center, and a lower holder (5) having a knockout pin insertion hole (7) penetratingly opened in the center thereof are bolted in a separable manner. In the holder split die, the mold member (3) has a mold hole (30).
It is configured by press-fitting a nib (31) having a tapered outer periphery with a tapered sleeve (32), and at least one of the mating surfaces of the sleeve (32) and the nib (31) and sleeve
A seizure-resistant surface modification layer (33) (34) such as TiC, TiCN, or TiN is formed on at least one of the mating surfaces of the (32) and the upper holder (1). Holder dicing die.