JP4210856B2 - Mold - Google Patents

Description

  The present invention relates to a mold, and more particularly, to a mold for pressurizing a product to be molded into a predetermined shape by a punch in a die.

For example, a die used for sizing for ensuring the dimensional accuracy of a product or forging for forming a product having a predetermined shape by plastic deformation of a rough shaped member is generally constituted by a die and a punch. In order to lubricate the sliding contact surface between the die and the punch, and to prevent the temperature rise due to pressurization of the molded product in the die by the punch, the rough shaped material (molded product) is lubricated / cooled fluid Conventionally, it is known to immerse in or spray a lubrication / cooling fluid onto a necessary portion by spraying or the like (see, for example, Patent Document 1).
Japanese Patent Application Laid-Open No. 2004-133867 defines a cavity with an upper die that can be raised and lowered, a lower die that includes a movable die that can be raised and lowered below the upper die, and a fixed die that surrounds the movable die, and an upper die and a movable die. A fixed die in a lubrication and cooling device for a forging die that has a knockout pin that is relatively movable up and down and is disposed on a movable die, and that allows the workpiece after molding to float above the movable die by the knockout pin. The inner surface is provided with a recess that forms a supply chamber connected to the supply source of the mist-like lubricant between the outer surface of the movable die and the movable die is supplied with the supply when the movable die is at the lower limit position. A first passage that communicates with the chamber and opens at the bottom of the cavity, and a second passage that communicates with the supply chamber when the movable die is raised and opens upward at the bottom of the cavity. Lubrication of forging die, wherein the cooling device is disclosed that is.
In this forging die lubrication and cooling device, when the workpiece is forged by the upper die and the lower die and then knocked out by the knockout pin, the mist-like lubrication is applied from the supply chamber to the lower surface of the cavity through the first passage. When the agent is sprayed and the movable die is raised, the second passage communicates with the supply chamber, and mist-like lubricant is sprayed from the open end of the second passage toward the upper upper mold. In Patent Document 1, when a workpiece is forged with the upper die and the lower die, the mist-like lubricant is jetted upward from the gap between the fixed die and the movable die constituting the lower die to clean the gap. It is described that it will be satisfied. That is, in Patent Document 1, a mist-like lubricant is sprayably applied to the gap between the fixed die and the movable die constituting the lower die, the cavity lower surface, and the upper upper die depending on the situation. It was a composition.

Japanese Patent Publication No. 6-71638

Among the above conventional techniques, in the case of immersing a rough shaped material (molded product) in a lubricating / cooling fluid, a separate process for immersing is required in addition to the molding process using a mold. There was a problem that it took time. In addition, when the molded product has pores formed by sintering or the like, if the product is immersed in a lubrication / cooling fluid, the lubrication / cooling fluid is excessively impregnated in the pores. When molding into a predetermined shape in the mold or in a process such as subsequent assembly, there is a problem that the lubricating / cooling fluid is scattered and the surroundings are soiled. Furthermore, since it is necessary to maintain the quality of the lubricating / cooling fluid in which the molded product is immersed, there is a problem that the management is complicated.
In addition, among the above-described conventional techniques, in the case where the lubrication / cooling fluid is sprayed and applied to the necessary part by spraying or the like, it is necessary to spray and apply the lubrication / cooling fluid to the molded product separately from the molding process, etc. There was a problem. In addition, when lubrication / cooling fluid is sprayed and applied to the molded product, not only the lubrication / cooling fluid is sprayed and applied to the necessary parts, but also splashes around it, resulting in waste and contamination of the surroundings. In addition, there is a problem that it is difficult to effectively lubricate and cool a necessary portion. Furthermore, the lubrication / cooling fluid generally tends to deteriorate its lubricity due to heat generated on the sliding surface between the die and the punch due to relative movement of the punch during molding, and temperature rise due to stamping. Lubricating / cooling fluid with deteriorated properties has a problem that galling or the like occurs and molding quality deteriorates. Also in Patent Document 1, since a mist-like lubricant is sprayed and applied, there is a problem similar to that of spraying and applying a lubricating / cooling fluid to a necessary portion. Furthermore, the die cannot be effectively cooled only by spraying and applying a lubricating / cooling fluid.

  The present invention has been made in view of the above-described problems. With a simple configuration, the sliding surface of the die and the punch can be properly lubricated without waste, and the die can be effectively cooled. -It aims at providing the metal mold | die which can maintain the quality of a cooling fluid easily.

In order to achieve the above object, the invention according to the first aspect of the present invention provides a die that forms a cavity in which a product to be molded is accommodated, and is slidably fitted into the die and molded in the die. A punch for pressurizing a product, a first passage that is arranged in the die and circulates and supplies a lubricating / cooling fluid, and a sliding contact surface that is formed on the outer peripheral surface of the punch and holds the lubricating / cooling fluid and holds the lubricating / cooling fluid A lubrication / cooling fluid holding portion for applying a lubrication / cooling fluid to the first passage, and a second passage that is branched from the first passage and is communicated / blocked with the punch lubrication / cooling fluid holding portion by movement of the punch , It is characterized by comprising.

According to the first aspect of the present invention, the product to be molded is accommodated in the die and pressed by moving the punch to be molded into a predetermined shape. At this time, the lubricating / cooling fluid is circulated and supplied to the first passage disposed in the die at all times or as necessary, thereby effectively cooling the die. Further, when the punch is moved to a predetermined position, a lubricating / cooling fluid holding portion formed on the outer peripheral surface of the punch is communicated with the second passage, and a second passage that is branched from the first passage is provided. Thus, the lubrication / cooling fluid holding unit is supplied and held in the lubrication / cooling fluid holding unit. When the punch is moved from a predetermined position, the lubricating / cooling fluid holding part is cut off from the second passage, and the lubricating / cooling fluid is lubricated every time the punch moves without being scattered around as the punch moves. -It is supplied from the cooling fluid holding part to the sliding contact surface with the punch of the die and is applied without waste in a short time.

According to the first aspect of the present invention, in particular, a first passage that is disposed in the die and circulates and supplies the lubricating / cooling fluid, and a die punch that is formed on the outer peripheral surface of the punch and holds the lubricating / cooling fluid. A lubrication / cooling fluid holding portion for applying a lubrication / cooling fluid to the sliding contact surface of the first and the second passages, which are arranged to be branched from the first passage and communicated with and cut off from the punch lubrication / cooling fluid holding portion by the movement of the punch . With the simple structure of having two passages, the sliding surface of the die and punch can be properly lubricated without waste and the die can be cooled, and the quality of the lubrication / cooling fluid can be easily maintained. It is possible to provide a mold that can be used.

One embodiment of the mold of the present invention will be described in detail based on FIG. 1 to FIG. 4 by using a sizing mold for a sintered part as a molded article. In the drawings, the same reference numerals are given to the same or corresponding parts.
The mold of the present invention generally includes a die 1 that forms a cavity 3 in which a molded product W is accommodated, and a slidably fitted inside the die 1 to add the molded product W within the die 1. A punch 2 to be pressed, a first passage 4 provided in the die 1 for circulating and supplying a lubricating / cooling fluid, and a sliding contact between the die and the punch that is formed on the outer peripheral surface of the punch 2 and holds the lubricating / cooling fluid. A groove 5 serving as a lubrication / cooling fluid holding portion for supplying a lubrication / cooling fluid to the surface, and a first branch 4 that is branched from the first passage 4 and communicated with or cut off from the groove 5 of the punch 2 by the movement of the punch 2 . 2 passages 6.

In the case of this embodiment, the die 1 is configured by press-fitting a die insert 11 into the diverter ring 10. As shown in FIG. 3, a cavity 3 is formed in the die insert 11 to accommodate, for example, a coarse shaped material of a sintered part as a molded product W.
As shown in FIGS. 2 and 3, the punch 2 includes a lower punch 20 that is fitted into the die insert 11 and an upper punch 21 that is disposed so as to face the lower punch 20. At the lower end of the lower punch 20, a flange 20a capable of abutting with the lower end surface of the die insert 11 is formed, and when the flange 20a is in the raised position where it abuts with the lower end surface of the die 1, the upper end surface thereof 20b is set to a length that can form the same surface as the upper end surface of the die 1. The lower punch 20 is slid with respect to the inner peripheral surface 11a of the die insert 11 and supported so as to move downward relative to the die 1 to the lower limit position as shown in FIGS. Has been. On the other hand, the upper end 21a of the upper punch 21 is supported by a press ram so that the upper punch 21 is inserted into the inner peripheral surface 11a of the die insert 11 from a state separated from the die 1 and slides to a predetermined position. .

A spiral groove is formed in the inner peripheral surface of the diuter ring 10, and the first passage 4 is formed around the inner peripheral surface 11 a of the die insert 11 by fitting the die insert 11 therein. Yes. A supply passage 4a for supplying lubricating / cooling fluid and a discharge passage 4b for discharging the lubricating / cooling fluid are respectively provided in the vicinity of the lower end portion and the upper end portion of the first passage 4 in the diverter ring 10. It is formed so as to penetrate the peripheral surface and the outer peripheral surface. In addition, the 1st channel | path 4 is not limited to this embodiment, It forms by forming the spiral groove | channel in the outer peripheral surface of the die insert 11, and it is comprised by externally fitting the diutering ring 10, etc. It can also be arranged by a technique.
On the other hand, a second passage 6 is formed at a position corresponding to the supply passage 4 a near the lower end of the die insert 11 so as to penetrate the inner peripheral surface and the outer peripheral surface of the die insert 11.
Corresponding to the second passage 6 when the lower punch 20 is moved downward relative to the die 1 to the lower limit position, as shown in FIGS. The groove 5 constituting the lubrication / cooling fluid holding portion is formed over the entire circumference at the position where it is to be. The lubrication / cooling fluid holding portion is not limited to the groove 5 and can be replaced with another shape such as a recess. The replenishment amount of the lubricating / cooling fluid to the groove 5 can be adjusted by the supply pressure of the lubricating / cooling fluid to the supply passage 4a and the size of the cross-sectional diameter of the second passage 6. The amount of the lubricating / cooling fluid held by can be adjusted by the cross-sectional area of the groove 5. Further, the lubrication / cooling fluid holding part holds the lubrication / cooling fluid supplied into the groove 5 and can apply the lubricant / cooling fluid to the inner peripheral surface 11a of the die insert 11 appropriately. A fiber such as felt or a porous member such as sponge may be inserted inside. Further, in order to prevent the lubricating / cooling fluid supplied to the sliding contact surface between the inner peripheral surface 11 a of the die insert 11 and the lower punch 20 from dropping downward, a sealing member such as an O-ring is provided below the groove 5. Also good. Further, the thickness (amount) of the lubricating / cooling fluid film formed by supplying and applying to the sliding contact surface between the inner peripheral surface 11 a of the die insert 11 and the lower punch 20 is adjusted by the clearance between the both 11 a and 20. be able to.

Next, the operation of the above-described mold according to the present invention will be described based on the case of sizing a sintered part which is a molded product W.
In the mold in a state before starting sizing (the state in which the previous cycle is completed), as shown in FIG. 1, the lower punch 20 rises relative to the die 1, and its flange 20 a becomes the die insert 11. The upper end surface 20 b is flush with the upper surface of the die 1. The upper punch 21 is removed from the inner peripheral surface 11a of the die insert 11 and retracted upward. At this time, the lubricating / cooling fluid is supplied and circulated to the supply passage 4a at a predetermined pressure and flow rate. The lubricating / cooling fluid is discharged from the supply passage 4a through the first passage 4 and from the discharge passage 4b to adjust the die 1 to a predetermined temperature. It is to be noted that the temperature of the die 1 can be detected and the temperature of the lubricating / cooling fluid can be adjusted and supplied based on a difference from a predetermined temperature of the desired die 1, and the lubricating / cooling fluid can be supplied. It is desirable to change the flow rate.
In this state, the second passage 6 is in a state where the communication with the groove 5 is blocked as the lower punch 20 is raised. However, a part of the lubricating / cooling fluid supplied from the supply passage 4a through the second passage 6 in the previous cycle is replenished and held in the groove 5 of the lower punch 20, and the lower punch 20 is supplied in the previous cycle. Is moved upward relative to the die 1, the lubricating / cooling fluid is supplied and applied from the groove 5 to the inner sliding surface 11 a of the die insert 11, and the inner sliding surface 11 a of the die insert 11 and the lower punch 20 are applied. A lubricating / cooling fluid film is formed on the sliding contact surface between the two.

  When starting the sizing, as shown in FIG. 2, the lower punch 20 is relatively lowered and the rough shaped material W before sizing the sintered part is aligned with the upper opening of the inner peripheral surface 11 a of the die insert 11. And housed inside the die 1. At this time, as the lower punch 20 is relatively lowered, the groove 5 is formed on the inner peripheral surface 11 a constituting the cavity 3 of the die 1 and the outer peripheral surface of the lower punch 20, that is, on the sliding contact surface between the die 1 and the punch 2. Lubricating / cooling fluid is supplied and applied to form a film. When the lower punch 20 is lowered to its lower limit position, the groove 5 is aligned with the second passage 6, and a part of the lubricating / cooling fluid supplied to the first passage 4 passes through the second passage 6 to form the groove 5. Will be replenished.

  Next, the upper punch 21 is lowered relative to the die 1 and is inserted into the inner peripheral surface 11 a of the die insert 11, and the upper end surface 20 b of the lower punch 20, the lower end surface 21 b of the upper punch 21, and the die insert 11 are inserted. When the cavity 3 is formed by the inner peripheral surface 11 a and the upper punch 21 is further slid to a predetermined position as shown in FIG. 3, the rough shaped material W becomes the lower punch 20 and the upper punch 21 in the cavity 3. And is molded with a predetermined dimensional accuracy. Although heat is generated by pressurizing the rough shape W and the die 1 tends to rise in temperature, the lubricating / cooling fluid circulates in the first passage 4 formed around the inner peripheral surface 11 a of the die insert 11. Since it is supplied, the temperature of the die 1 does not rise above the set temperature. Further, since the lower punch 20 moves up and down relatively with respect to the die 1, a film of lubricating / cooling fluid is formed on the inner sliding surface 11 a of the die insert 11. Smooth sliding with respect to the inner sliding surface 11a suppresses the generation of frictional heat.

  When the forming of the rough shaped material W is completed, the upper punch 21 is relatively moved upward and removed so as to retract from the inner sliding surface 11a of the die insert 11, and the lower punch 20 is attached to the die 1 as shown in FIG. The product W ′ that has been molded is moved onto the die 1 by moving upward relative to the die 1. At this time, along with the relative upward movement of the lower punch 20 with respect to the die 1, the lubricating / cooling fluid is supplied from the groove 5 to the sliding contact surface between the inner peripheral surface 11 a of the die insert 11 and the lower punch 20. -A film of cooling fluid will be formed.

  As is clear from the above description, in the mold according to the present invention, a punch for sliding a part of the lubricating / cooling fluid circulated and supplied to the first passage 4 to cool the die 1 with respect to the die 1. Also used for 2 lubrication. The lubrication / cooling fluid is supplied and applied to the sliding contact surface with the die 1 as the punch 2 moves to form a film, and the punch 2 moves to a predetermined position with respect to the die 1. When this occurs, the groove 5 is replenished. The present invention is not limited to a sizing die, but can be applied to other dies such as a forging die.

FIG. 3 is a cross-sectional view illustrating an embodiment of the mold of the present invention and illustrating a state before starting molding in which a lower punch moves upward relative to a die. FIG. 5 is a cross-sectional view for explaining a state in which the lower punch is moved downward relative to the die from the state of FIG. 1 and the groove is aligned with the second passage. FIG. 3 is a cross-sectional view illustrating the state in which the upper punch is relatively moved downward from the state of FIG. 2 to press the rough shaped material housed in the cavity between the upper punch and the lower punch. . From the state of FIG. 3, the state in which the upper punch is moved upward and retracted, and the lower punch is moved upward relative to the die to move the product on which the cavity molding has been completed onto the die will be described. FIG.

Explanation of symbols

1: Die, 2: Punch, 3: Cavity, 4: First passage, 5: Groove (lubricating / cooling fluid holding part), 6: Second passage

Claims (1)

A die that forms a cavity in which the article is accommodated;
A punch that is slidably inserted into the die and pressurizes the molded product in the die;
A first passage disposed in the die and circulated to supply lubricating / cooling fluid;
And a lubricating and cooling fluid holding portion for applying lubricating and cooling fluid to the sliding surface between the punch die holding the formed lubricating and cooling fluid to the outer peripheral surface of the punch,
A second passage branched from the first passage and communicated / blocked with the punch lubrication / cooling fluid holding portion by movement of the punch ;
A mold characterized by comprising

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