JPS6061133A - Forging method of holed part having shaft part - Google Patents

Abstract

PURPOSE:To obtain a holed part having a shaft part such as a joint member or the like at a good material yield by forming a preliminary recess in the bulging part of a shaft-shaped blank material, forming the shape approximate to an intended shape then forming two recesses facing each other by indentation. CONSTITUTION:A blank material 13 having a bulging part 13a is formed by forging from a round bar blank material. The preliminary recess 14d for the 1st recess is formed to the part 13a to form a preform 14a. The bottom part 14a of the recess 14d is upset to expand the outside size A of the head part to C in succession to said forming so that the intermediate part 15e between the head part and the shaft part is made into the shape approximate to the intended finish forged shape. The 2nd recess 16f is formed by indentation to the bottom wall part 15a of such intermediate part 15. The formed article having high accuracy and high strength is obtd. by the above-mentioned method.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for molding a component having a shaft-shaped portion and two opposing recesses located at one end or an intermediate portion of the shaft and having an axis substantially perpendicular to the axis of the shaft. It is something. A specific example of the component is a component of a joint used in a directional control system for automobile wheels. 1st
The figure shows an example of the structure of this joint, in which the head (1a) of the main body (1) is connected to a pin (2) having a ball (2a) at one end via a push-piece (3). The shaft part (1b) is rotatably housed, and a rod having a threaded part that fits the threaded part (1c) formed at the shaft center is incorporated into the shaft part (1b). When controlling the direction of the wheels, the pin (2)
(3), the power is transmitted to the main body (1), the rod (5), or in the opposite direction. A lock nut (6) is also provided to prevent rotation between the rod (5) and the main body (1). Further, a lid (4) and a cover (7) are fixed to the head (1a).

The present invention specifically relates to a method of processing the main body (1) of the joint. The main body includes a shaft portion (1b);
A hollow portion (1d
), and an intermediate portion (1e) between the head (1a) and the shaft portion (1b).
) and the four escape parts (1f) of the pin (21).

Conventionally, as shown in Fig. 2, the method for processing the main body (1) is to use a pair of dies to set a material (8) or columnar material having an enlarged portion (8a) at one end of the shaft (81). machining an intermediate part (9) having a shape similar to the desired shape and having a burr (old) along its innermost ring space;
Next, the body (θ0) and the bar IJ (Il+) were separated from each other by forging. The bar IJ (Il+) is essential for obtaining the detailed shape of the main body (10). Since the main body (10) has an asymmetrical shape, the head (10)
The forming punches in the recesses (10f) and (10d) in a) receive thrust in a direction perpendicular to the main forming direction during molding, so they are easily damaged and it is difficult to machine the recesses deeply. The diameter of the recess could not be made close to the desired shape. Therefore, the conventional construction method has disadvantages in that it requires cutting of the inner diameter of the recess and that the material retention is low.

The present invention was devised to eliminate the drawbacks of the conventional method, and details of the method will be described below with reference to one embodiment thereof.

FIG. 3 is a diagram showing the processing steps of the material. Round bar material (
From 121, a material (13) having an enlarged portion (13a) is forged. FIG. 4 is a diagram showing the subsequent molding process. A preliminary recess (14) of the first recess is provided in the enlarged portion (13a).
Preformed product 0 (a) is obtained by molding d).

(First step, T+ arrow in FIG. 4) Next, the bottom part (14a) of the four preliminary parts formed in the previous step is upholstered,
The outer dimension of the head is enlarged to Af:C, and the intermediate portion (15e) between the head and the shaft is shaped to approximate the desired forged punched shape. Here, the head (15
An intermediate part (15) is obtained in which the outer peripheral part (15a) of a) has a shape similar to the corresponding part (1, 6a') of the intended forged punched-shape part. (Second process) Furthermore, intermediate parts (
15) a second die (18) equipped with a second punch On for forming a second recess (16f) in the bottom wall (15a);
By the first die (2o) opposite to this, the intermediate part 05 is
Block 1. FIG. 5 shows a state where the intermediate part (151) is closed by the first die and the second die. Inside the first die, there is a molded part (151) which can be slid vertically in the figure.
16) is ejected from the die) (21
+ is provided. (2) Inside the +, the first punch (1
9) is provided. The first die is vertically movable and guided by a ring (22) and is provided on the bolster side of the press, and is urged upward so as to form a closed chamber together with the second die (08) that restrains the work being molded. The first die (20) is fixed to the slide side of the press.

As the slide descends, the intermediate part inserted into the first die is blocked by the first die (20) and the second die (Fig. 5), and as the slide further descends, the intermediate part is pressed by the first punch. The material in the center flows in the direction of F and the desired finished product (161) is obtained.

(Third step) FIG. 6 shows the state of the press at the bottom dead center.

A knocker (25) is provided in the second die (I8) to separate the molded product 06) from the second die.

A second example of forming the material (I3) into a molded article will be described below. Uploading the bulk part (13a) of the material (13),
The intermediate part (23e) is molded together with the preformed product (23).
7- (first step, T2 arrow in Figure 4). Subsequently, a preliminary concave portion (24d) is formed in the enlarged portion (23a) of the preformed product to form an intermediate part (2(1)) (second step).
24I has the same shape as the intermediate part (+51), and the step (third step) of molding it into a molded product (I6) is the same as in the first embodiment.

The thickness E of the bottom part (15a) of the intermediate part (15) is preferably thin in order to prevent the shape of the outer peripheral part (16a) of the head part from being crushed during the molding process in the third step.

Due to this requirement, a preliminary recess (15d) is required.

The reason why the molding process for the intermediate part (15e) and the molding process for the preliminary recessed part (14d) were separated in the first embodiment is that molding them at the same time would increase the molding pressure and shorten the life of the mold. . The so-called closed forging method is applied to the process of forming the preliminary recess, and the required closing force in this process is determined by the projected area to be closed.

In the second embodiment, it is 7(c2-D2), but the first embodiment is better in terms of reducing the closing force. On the other hand, in the second embodiment, the shape and dimensions of the intermediate portion (24e) can be easily obtained.

Although the above example requires three steps, in the case of a material with low deformation resistance, the material is immediately formed into an intermediate product (+51) having a preliminary recess (15d), and then the first and second embodiments are performed. A molded article (16) can be obtained through the third step, that is, through two steps.

The main forming direction of the press in each of the above steps is the first recess (16d
) is the axis GG direction of the third embodiment of the first and second embodiments.
The flow of the material in the process is mainly in the G-G direction, and the flow in the H direction perpendicular to it is slight υ.The inner diameter dimensions of the first recess (16d) and the second recess (16f) are respectively The dimensions of the hollow part (1d) and the fourth part (1f) can be approximated. That is, the cutting allowance after forging can be reduced. It is also possible to punch out the bottom part (16 g) of the molded product using a press. In this case, the process of cutting and finishing the inner diameter part of the head after forging is further reduced.

Furthermore, according to this construction method, closing processing can be applied to the entire process, and the second
There is no occurrence of burrs (as shown in the figure) and the material has a good tightness. Since no paris occurs, the fiber flow of the molded product is continuous, and the strength of the finished product is high. Also, during the series of steps to obtain the molded product 06) from the material 03), annealing and lubrication are required. There is no need for additional coating treatment, and it is also possible to transfer a series of steps. It is also possible to perform this series of steps in the cold, and in this case, the molded product has high strength and high dimensional accuracy due to work hardening.

FIG. 7 shows an example of a molded product having a hole (26d) in the middle of the shaft (26c) whose axis is substantially perpendicular to the shaft center, and the molded product 06) is shown in FIG. It is possible to use a shaft-shaped material having an enlarged portion (27a) in the middle as shown in FIG.

As described above, if a holed part having a shaft portion is formed by nature, a small amount of material is retained, and the cutting and finishing steps after forging are reduced. In addition, the series of steps for obtaining the molded article 06) from the material θ3) does not generate flash, and the extra molding energy that would otherwise be required due to the generation of flash is unnecessary, resulting in energy savings. This series of steps can be performed even in cold molding, and a molded product with high precision and high strength can be obtained.

[Brief explanation of drawings]

Figure 1 is a structural diagram of the joint, 11- Figure 2 is a conventional process diagram, Figure 3 is a raw material processing diagram, Figure 4 is a process diagram, Figure 5 is a mold diagram, and Figure 6 is a mold diagram. , Figure 7 shows the molded product, and Figure 8 shows the shaft-shaped material. 1 is the main body, 2 is the pin, 3 is the bush, 4 is the lid, 5 is the rod, 6 is the lock nut, 7 is the cut-out, 8 is the material, 9
is an intermediate part, 10 is a main body, 11 is a nose, 12 is a round bar material, 13 is a raw material, 14 is a preformed product, 15 is an intermediate part,
16 is a molded product, 17 is a second punch, 18 is a second die,
19 is a first punch, 20 is a first die, 21 is a knockout, 22 is a ring, 23 is a preformed product, 24 is an intermediate part, 25 is a knockout, 26 is a molded product, and 27 is a shaft-like material 12-. Patent applicant Representative of AIDA ENGINEERING Co., Ltd.
Meeting 1) Engraving of Keinosuke's drawing (no changes in content) Figure 1 11 t. / 1 Procedural amendment (method) February 1, 1980 1, Indication of case Patent application No. 168854 of 1982 2
Title of the invention: Method 3 for forging a part with a hole having a shaft portion.
Relationship with the case of the person making the amendment Patent applicant Location: 2-10-4, Oyama-cho, Sagamihara-shi, Kanagawa 229, Japan Date of amendment order: January 11, 1980 (Delivery date: January 31, 1980) 5 Amendment (1) Brief explanation of the drawing (2) Drawing 6, contents of the amendment As shown in Attachment 1, Brief explanation of the drawing, page 13, line 16, 127 is a shaft-shaped material. 127 is a shaft-shaped material, P is the first process, Q is the second process,
R. is the third step,” I corrected. 2.Drawings (1) Figures 1, 2, 3, 5, and 6 have been reprinted as shown in the attached drawings (no changes have been made to the contents). ,-2 Figure 4 has been reprinted and corrected as shown in the attached figure. (3) Figures 7 and 8 have been added because they were not attached to the original application. Patent applicant Representative of AIDA ENGINEERING Co., Ltd.
1) Keinosuke = 2- Director General of the Patent Office Kazuo Wakasugi 1 Display of the case Patent Application No. 168854 of 1982 2
, Title of the invention: Method for forging a part with a hole having a shaft portion 3,
Relationship with the case of the person making the amendment Patent applicant Location 2-10-4 Oyama-cho, Sagamihara-shi, Kanagawa 229 Target of amendment (1) Scope of claims in the specification (2) Detailed explanation of the invention in the specification 5 , Contents of the amendment As shown in Attachment 1: Claims in the Specification The claims are amended as follows. [In a method for forging a part having a uniaxial portion and two opposing recesses having an axis substantially perpendicular to the axis of the shaft at one end or a middle portion of the shaft, forming a preliminary recess for a first recess in a direction substantially perpendicular to the axial portion in the axial portion of the axial material having an bulge in the portion; and a step of machining a first recess and a second recess by pushing a portion close to the bottom of the preliminary recess in the axial direction of the preliminary recess. A method for forging a holed part 2 having a shaft part. 2 In a method for forging a part having a shaft-like part and two opposing recesses at one end or a middle part of the shaft-like part and having an axis substantially perpendicular to the axis of the shaft-like part, the shaft part and one end or a middle part thereof. A process of processing the surface of the ampulla of a material having an ampulla in a portion and an intermediate portion between the ampulla and the shaft into a shape approximating the desired shape, and forming the ampulla at a substantially right angle to the shaft. a step of processing the four parts in the same direction to form the preliminary four parts of the first recess, and a step of pushing a part close to the bottom of the recess in the axial direction of the recess to process the first four parts and the second fourth part. A method for forging a part with a hole having a shaft portion, characterized by: 3. Shaft-shaped portion and one end of the shaft-shaped portion 3- In the forging method of a part having two opposing recesses in the instep portion having an axis substantially perpendicular to the axis of the shaft portion, A preliminary recess for the first recess is machined in a direction substantially perpendicular to the axis of the shaft-like part in the enlarged part of a material having an enlarged part at one end or a middle part thereof, and at the same time, the enlarged part and the enlarged part are processed. processing the surface part of the intermediate part between the part and the shaft part into a shape similar to the desired shape, and pushing the part close to the bottom of the preliminary recessed part in the axial direction of the recessed part to form the first recessed part and the second recessed part. A method for forging a part with a hole having a shaft portion, the method comprising: machining four parts of the shaft portion. 2. Detailed explanation of the invention in the specification a. On page 8, line 2 of the specification, it says ``The first die (20 is -4
Correct "=" to "[2nd die 08) is"]. b. In the 8th line of page 10 of the specification, the statement "Molded into 1 intermediate product (15)" was corrected to "Molded into intermediate product (15) (T3 arrow in Figure 4)" and edited. . In the 4th line of page 12 of the C1 specification, the phrase "One shaft-shaped material" has been corrected to "A shaft-shaped material (27)." Patent applicant Representative of AIDA ENGINEERING Co., Ltd.
Meeting 1) Keinosuke 5-

Claims (1)

[Scope of Claims] 1. A method for forging a part having a shaft-like portion and two opposing four portions having an axis substantially perpendicular to the axis of the shaft at one end portion or an intermediate portion of the shaft, A step of forming a first fourth part in a direction substantially perpendicular to the axial part in the bulged part of a shaft-like material having an bulged part at one end or a middle part, and an intermediate part between the bulged part and the axial part. and a step of machining a second recess by pushing a portion close to the bottom of the first recess in the axial direction of the first recess. 1- Method for forging a part with a hole having a shaft portion. 2 In a method for forging a part having a shaft-like part and two opposing recesses at one end or a middle part of the shaft-like part and having an axis substantially perpendicular to the axis of the shaft-like part, the shaft part and one end or a middle part thereof. A process of processing the surface of the ampulla of a material having an ampulla in a portion and an intermediate portion between the ampulla and the shaft into a shape approximating the desired shape, and forming the ampulla at a substantially right angle to the shaft. a step of machining a recess in a direction to form a first recess, and pressing a portion close to the bottom of the recess in the axial direction of the recess to form a second fourth portion different from the first recess. A method for forging a part with a hole. 38 A shaft-shaped portion and two opposing shafts having an axis in a direction substantially perpendicular to the axis of the shaft-shaped portion at one end or an intermediate portion of the shaft-shaped portion.
Forging a part having two recesses 2- In the forging method, a first recess is formed in the enlarged part of a material having an enlarged part at one end or a middle part of the shaft part in a direction substantially perpendicular to the axis of the shaft part. At the same time, a step of processing the surface portion of the enlarged portion and an intermediate portion between the enlarged portion and the shaft portion into a shape approximating the desired shape; A method for forging a hole-drilled part having a shaft portion, the method comprising pressing in the axial direction of the recessed portion and machining a second four portions different from the first four portions.