JPH0824987A - Die block - Google Patents

Abstract

PURPOSE:To prevent the burning between a die block and a die. CONSTITUTION:A die fitting hole 10 is opened at the position for holding the die 6 and the die block is formed with the burning resistant surface modified layer 20 directly in the inner surface of the hole 10 or in the inner surface of a sleeve 2 inserted into the hole 10. At the time of forging or cold heading, even if the die 6 is elastic-deformed by repeatedly loading the shock to the die 6, the burning between the die 6 and the sleeve 2 is not developed, because of the existence of the burning resistant surface modified layer 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die block which detachably holds a die for forging and forging a bolt, a nut and other mechanical parts.

[0002]

[Prior Art] Forging bolts, nuts and other mechanical parts
The press forming is performed by punching a blank into a die hole of a die with a punch. The die is detachably accommodated in a die mounting hole formed in the die block.
The die is elastically deformed each time it is subjected to the impact of forging and forging, and the die cavity is worn out by the processing of tens of thousands to hundreds of thousands of times, so that the die must be replaced. Since the dies are heavy and inefficient for manual replacement work, the dies may be replaced by a robot.

[0003]

The die is fitted into the die mounting hole of the die block without any rattling,
A set bolt screwed onto the die block presses and holds the hole surface. In this state, the impact of forging and forging is repeatedly applied to the die, and the die elastically deforms,
The pressure contact portions of the hole surface of the die block and the peripheral surface of the die stick to each other. If seizure occurs between the hole surface of the die block and the die, the die cannot be pulled out.

It is understood that if the die is manually replaced, the die will be seized and cannot be removed. However, the robot cannot make such a decision, and the robot is forced to cause a big trouble. If the seized die is removed from the die block with a hydraulic hammer or the like and the die mounting hole is honed to remove the seizure surface, the hole diameter becomes large. In this case, there is rattling in the fitting of the standard size die, and a situation arises in which an expensive die block must be replaced.

Further, depending on the type of die, there is a case in which only a mold member having a mold hole is exchanged and a reinforcing case for holding the mold member can be repeatedly used, but it is burned between the die block and the reinforcing case. If sticking occurs, it cannot be used as it is. The outer peripheral surface of the reinforcing case may be polished to remove the seizure surface. However, if the outer diameter of the reinforcing case becomes smaller due to the polishing, it will not fit into the die mounting hole of the die block, and there will be a problem that it cannot be used. The present invention discloses a die block that can solve the above problems.

[0006]

According to the die block of claim 1, a die mounting hole (10) having a diameter larger than the outer diameter of the die (6) is formed at a position for holding the forging / forging die (6). The hole (1
The sleeve (2) is inserted into the sleeve (0), and the seizure-resistant surface modification layer (20) is formed on the inner surface of the sleeve (2).

In the die block of claim 2, a die mounting hole (10) into which the die (6) is tightly fitted so that the die (6) can be inserted and removed is formed at a position where the die (6) for forging / pressing is held, and the die mounting hole (10) is formed. A seizure resistant surface modification layer (20) is formed directly on the hole surface.

[0008]

In the die block according to the first aspect, the die (6) is fitted into the die mounting hole (10) of the block through the sleeve (2) press-fitted to the die (6) of the sleeve (2). Since the seizure-resistant surface modification layer (20) is formed on the contact surface of the die, even if the die (6) is repeatedly impacted and elastically deformed during forging and forging, the die is deformed. No seizure occurs between (6) and sleeve (2).

Therefore, the robot can smoothly perform the die exchange. Further, it is possible to solve the problem that the die block cannot be repeatedly used, such as the replacement of the die block and the case where the outer surface of the die is seized on the die block (1) as in the conventional case.

Further, the seizure-resistant surface modified layer (20) is formed by chemical vapor deposition or physical vapor deposition on the surface of TiC or TiC.
It can be formed by depositing a layer of N, TiN, etc., but the surface processing cost of these is calculated by the unit price per unit weight of the object to be processed. Therefore, it is not possible to directly form the surface modification layer (20) in the die mounting hole (10) of the die block.
Since the processing cost for the weight of (1) is required, compared to this, it is sufficient to apply the surface modification layer (20) only to the sleeve (2). Therefore, it is necessary to form the surface modification layer (20). Can significantly reduce the cost.

A die block according to a second aspect is a surface modification layer (2) having a seizure resistance, which is directly attached to a die mounting hole (10) of the die block.
The sleeve (2) as described above can be omitted in order to form 0). In terms of preventing seizure on the outer surface of the die (6), the same effect as described above is obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a horizontal transfer press frame (4) known as a nut homer or parts homer.
Back plate (5) and bolted sheet pile (51) on the front of the
It is a top view of the state which attached the die block (1) through.

Both end faces (100) (100) of the die block (1) are
The tapered surface (41) of the frame side wall and the tapered surface (5) of the sheet pile (51)
It has a tapered surface corresponding to 2). Die block (1)
Concave step portions (18) and (19) are formed on the front surface upper portion and the front front upper portion of the punch side so as not to interfere with the attachment and operation of the transfer chuck device (not shown).

In the die block (1) of the embodiment, one wire feed hole (11) and four die mounting holes (10) are formed in a horizontal row penetrating the front and rear surfaces of the block. . The die mounting holes (10) are arranged at equal pitches. On the front surface of the die block (1), a counterbore screw hole (15) for attaching the piece piece (3) is formed near each die attaching hole (10).
A part of the counterbore recess (16) of (15) is hooked on the die mounting hole (10).

The piece piece (3) has a counterbore hole (31) for inserting a bolt (33) at the center of the disk, and a cut portion (32) at a part of the outer circumference.
Is provided, and a cut portion (32) is applied to a step portion (not shown) on the front surface of the die (6) to prevent the die (6) from being stopped and pulled out. A counterbore screw hole (15a) similar to the above counterbore screw hole (15) is also formed in the vicinity of the wire rod supply hole (11).

The wire supply hole (11) has a quill for shearing the wire.
(Not shown) is detachably fitted, and the above counterbore screw hole (1
The piece attached to 5a) prevents the quill from rotating and popping out. The wire rod that has passed through the through hole of the quill and is exposed from the front end of the quill is sheared to a predetermined length by a shearing blade (not shown) that reciprocates orthogonally to the axis of the quill. On the upper surface of the die block (1), a screw hole (13) for a set bolt that penetrates the die mounting hole (10) is formed.

A plurality of bolt insertion holes (17) are formed in the lower portion of the front surface of the die block (1) so as to penetrate through the rear surface thereof. The bolt insertion holes (17) are inserted through the back plate (5) and the frame ( The die block (1) is attached to the frame by means of bolts (not shown) screwed to 4) and the bolt stop sheet pile (51).
It is fixed at (4). Each die mounting hole (10) has a die (6) through a sleeve (2) press-fitted over the entire length of the hole.
Is held.

In the embodiment, the inner diameter of the die mounting hole (10) and the outer dimension of the sleeve (2) are the same or slightly.
The outer diameter of This is because if the press-fitting margin of the sleeve (2) is increased, the inner diameter of the sleeve (2) is reduced accordingly.
This is because it is difficult to make the die have a size that allows smooth and smooth insertion and removal.

The sleeve (2) has a seizure-resistant surface modification layer (20) formed on the inner and outer surfaces thereof. Example surface modification layer
(20) is a layer of TiC or TiCN by chemical vapor deposition (CVD) or a layer of TiN by physical vapor deposition (PVD),
TiC, TiCN, TiN and the like penetrate into the metal structure and are partially bonded, and the thickness thereof is 5 to 10 μm,
Since the dimensions cannot be seen with the naked eye, the illustration is exaggerated with a bold line for the purpose of explanation.

A die block is provided on the front end surface of the sleeve (2).
Notch (22) and piece piece corresponding to front concave step (19) of (1)
A notch (21) is provided to fit in the vicinity of the cut portion (32) of (3). Further, a bolt through hole (23) is formed on the peripheral surface of the sleeve (2) at a position corresponding to the screw hole (13) for the set bolt of the die block (1).

The notches (21) (22) and the through holes (23) of the sleeve (2) may be machined or die-blocked before the sleeve (2) is press-fitted into the die-block (1). You may process after press-fitting in (1). The die (6) is attached to the front of the sleeve (2) and the pedestal (64) is attached to the rear of the sleeve (2) so that the die can be inserted and removed.

The die (6) is clamped by tightening a set bolt (14) screwed to the die block (1).
As a result, the opposite position of the set bolt (14) on the inner surface of the sleeve (2) and the peripheral surface of the die (6) are in contact with each other in a pressed state. The die (6) is located in the center of the front part of the reinforcing case (61).
(62) is embedded by shrink fitting or press fitting, and the mold hole is formed in the mold member (62).
(60) has been established.

A protruding pin (63) is provided at the axial center of the reinforcing case (61).
Is slidably deployed. A drive pin (65) is slidably arranged at the axis of the pedestal (64).
(65) slides toward the die (6) by a kicking device (not shown), and the blank in the mold cavity (60) projects forward through the projecting pin (63).

Die block facing the die block (1)
A punch case (81) is provided so as to face each die (6) on the ram (7) which can be moved toward and away from the (1), and the punch case (81) has a punch (8) for forging and forging. ) Is attached.

However, the die (6) is fitted in the sleeve (2) in the die block, and a seizure-resistant surface modification layer (20) is formed on the contact surface of the sleeve (2) with the die (6). Therefore, seizing does not occur between the die (6) and the sleeve (2) even if the die (6) is repeatedly impacted and elastically deformed during the forging / pressing. Therefore, the robot can smoothly perform the die exchange, and it is possible to solve the conventional problems such as the die block exchange due to the seizure and the die reinforcement case which cannot be repeatedly used.

Further, the seizure-resistant surface-modified layer (20) is formed by chemical vapor deposition or physical vapor deposition on the surface of the tapered hole of TiC or T.
Although a layer of iCN, TiN, or the like can be deposited and formed, the surface processing cost of these is generally determined by the weight of the object to be processed. Therefore, compared to forming the surface modification layer (20) directly in the die mounting hole (10) of the die block, applying the surface modification layer (20) to the sleeve (2) is (20)
In terms of formation of, the cost can be reduced significantly.

The surface modification layer (20) only needs to be formed on the inner surface of the sleeve (2), but the formation of the surface modification layer (20) is filled with vapor containing the metal to be deposited. Since it is performed by leaving the sleeve (2) in the reaction chamber,
The surface modification layer is formed not only on the inner surface of the sleeve (2) but also on the outer surface and the end surface thereof, but they do not hinder the practice of the present invention. Rather, the surface modification layer (20) is also formed on the outer peripheral surface of the sleeve (2), which means that when the sleeve (2) is press-fitted into the die mounting hole (10) of the die block (1), a press-fitting margin is required. When it is large, it is effective in preventing seizure between the sleeve (2) and the die mounting hole (10).

When the die (6) is replaced several times to several tens of times, the surface modification layer (20) on the inner surface of the sleeve (2) is reduced and the seizure prevention effect is reduced. In this case, the die block (1) may be removed from the frame (4) and the sleeve (2) may be replaced. Of course, a seizure resistant surface modification layer (20) is formed on the inner surface of the new sleeve (2).

In carrying out the present invention, a die mounting hole
A surface modification layer similar to the above may be formed directly on the inner surface of (10) to prevent seizure from the outer peripheral surface of the die (6). In this case, it is needless to say that the diameter of the die mounting hole (10) is reduced corresponding to the omission of the sleeve (2). The present invention is not limited to the configuration of the above embodiment, and various modifications are possible within the scope of the claims.

[Brief description of drawings]

FIG. 1 is a plan view of a die block with a part cut away.

FIG. 2 is a front view of a die block.

FIG. 3 is a vertical cross-sectional view of a die block.

FIG. 4 is a cross-sectional view of a die block with a die inserted.

FIG. 5 is a perspective view of a sleeve and a piece of the piece.

[Explanation of symbols]

 (1) Die block (10) Die mounting hole (2) Sleeve (20) Surface modification layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number in the agency FI Technical indication location C23C 16/36 30/00 A (72) Inventor Kunihiro Tajima 9 Takiharu-cho, Minami-ku, Nagoya-shi, Aichi Stock company Daido Machinery Works

Claims (3)

[Claims] 1. A die mounting hole (10) larger than the outer diameter of the die (6) at a position for holding the forging / forging die (6).
Open the sleeve and insert the sleeve (2) into the hole (10).
(2) A die block having a seizure-resistant surface modification layer (20) formed on the inner surface. 2. A die mounting hole in which the die (6) is tightly fitted in a position where the die (6) for forging / forging is held so that the die (6) can be inserted and removed.
A die block, characterized in that (10) is opened and a seizure-resistant surface modification layer (20) is directly formed on the hole surface of the hole. 3. The seizure-resistant surface-modified layer (20) comprises TiC and T deposited on the surface of holes by chemical vapor deposition or physical vapor deposition.
The die block according to claim 1 or 2, which is a layer of either iCN or TiN.