JP2001347525A - Mold for molding resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a heating and cooling cycle of a mold and to reduce a molding cost by distributing a heating medium to a part near a cavity of the mold and positively distributing the medium to a bottom of a recess. SOLUTION: Narrow grooves 51 for distributing the heating medium are formed on a bottom 33h of the recess 33, and metal particles 53 having a particle size larger than the width of the groove 51 are disposed on a part contacted with the grooves 51. Thus, the medium is distributed to a part near the cavity 50 and a gap for distributing the medium is assured to positively distribute the medium to the bottom 33h of the recess 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a resin molding die.

[0002]

2. Description of the Related Art As resin molding dies, for example,
-285169, "Mold for resin molding"
Japanese Patent Application Laid-Open No. -9744 discloses a "mold". The above is
According to FIG. 1 of the publication, a mold body 14 (the reference numerals used in the publication are diverted) is formed of a porous sintered metal for heating or cooling, and a metal or composite is formed in a cavity of the mold body 14. A surface coating 12 such as resin or ceramic is formed, a mold body 14 is covered with a back plate 16R, and a temperature control fluid supply pipe 22R and a temperature control fluid discharge pipe 24R are connected to the back plate 16R. The above is shown in FIG.
According to the method, a partial region 3 of a porous material is formed near the surface of the cavity 2 of the mold 1 for cooling, and a surface layer 7 such as plating is formed in the partial region 3. 3, a water supply channel 4 and a drain channel 5 are connected.

[0003]

However, in the above-described resin molding die, when a heating medium or a cooling medium flows from the temperature control fluid supply pipe 22R to the die body 14 formed of porous sintered metal. Since only the heating medium or the cooling medium flows from the temperature control fluid supply pipe 22R to the temperature control fluid discharge pipe 24R in the mold body 14, it is difficult to flow the heating medium or the cooling medium to the surface layer of the mold body 14. It is. As a result, uneven temperature may occur in the mold body 14. In the above-mentioned mold, since the surface layer 7 is formed by plating on the partial area 3 of the porous material, the cooling water flowing through the partial area 3 cannot directly touch the surface layer 7, and the cooling efficiency may be deteriorated. is there.

Accordingly, an object of the present invention is to provide a resin molding die capable of positively flowing a heat medium to a portion near a cavity and shortening a heating / cooling cycle of the die. It is in.

[0005]

In order to achieve the above object, a first aspect of the present invention is to open a recess in a mold body such that the bottom of the recess approaches the cavity, and to form a sintered metal layer in the recess of the mold body. By forming and closing the recess with a lid member, by flowing a heating medium as a cooling medium or a heating medium through the sintered metal layer,
A resin molding die capable of forcibly cooling or forcibly heating a mold body, wherein a narrow groove for forming a heat medium is formed at the bottom of the concave portion, and a narrow groove is formed at least in a portion in contact with the narrow groove. A metal grain having a diameter larger than the groove width is arranged.

The concave portion is opened in the mold body so that the bottom of the concave portion approaches the cavity, a sintered metal layer is formed in the concave portion of the mold body, the concave portion is closed with a lid member, and the cooling medium is added to the sintered metal layer. Alternatively, the mold body is forcibly cooled or heated by flowing a heating medium as a heating medium. At this time, a narrow groove through which the heat medium flows is formed at the bottom of the concave portion, and a metal particle having a diameter larger than the groove width of the narrow groove is arranged at least in a portion in contact with the narrow groove. That is, by forming a narrow groove through which the heat medium flows at the bottom of the concave portion and disposing a metal particle having a diameter larger than the groove width of the narrow groove in a portion in contact with the narrow groove, a portion close to the cavity is formed. In addition, the heat medium is allowed to circulate, and at the same time, a gap for flowing the heat medium is ensured so that the heat medium flows positively to the bottom of the concave portion.

According to a second aspect of the present invention, the cross section of the narrow groove is an arc cross section. The cross section of the narrow groove is an arc section,
The molding pressure applied to the sintered metal layer from the cavity is dispersed.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a perspective view of a resin molding die according to the present invention. The resin mold apparatus 20 includes a movable mold 30 as a resin mold and a fixed mold 40 as a resin mold. The movable mold 30 includes a molding protrusion 32. The molding concave portion 42 is formed in the fixed mold 40, and the molding concave portion 42 and the molding convex portion 32 are combined to form the cavity 50 for molding the resin molded product W.

FIG. 2 is a sectional view taken along line 2-2 of FIG. 1 and shows a vertical section of the movable mold 30. As shown in FIG. The movable mold 30 includes a molding protrusion 32 formed in the mold body 31, a recess 33 formed in the mold body 31, a porous sintered metal layer 34 formed in the recess 33, The cover member 35 that covers the binding metal layer 34 and the recess 33 collectively, and the water inlets 36 as a plurality of inlets formed in the mold body 31 (a plurality of inlets are shown).
And the drains 37 as outlets. In addition, in this figure, the inlet 36 ... and the drain 37 ...
Indicates only one. The fixed mold 40 includes a mold recess 41 in the mold body 41, and the mold body 41 includes substantially the same recess as the movable mold 30, a sintered metal layer, a lid member, a water inlet and a drain. And the detailed description is omitted.

FIG. 3 is a sectional view taken along line 3-3 of FIG. The concave portion 33 is opened in the mold body 31 so that the bottom 33 h approaches the cavity 50, and has the first ribs 38 for interpolating the strength of the cavity 50. The bottom 33h is formed with narrow grooves 51... Through which a heat medium (not shown) flows. The sintered metal layer 34 is a member for flowing a cooling medium or a heating medium as a heat medium (not shown), and has a narrow width at a portion in contact with the narrow grooves 51 formed on the bottom 33h. This is a metal layer in which metal grains 53 having a diameter larger than the groove width of the grooves 51 are arranged. The heating medium (not shown) includes the sintered metal layer 3
4 is a medium for forcibly cooling or forcibly heating the movable mold 30 by flowing the

The cover member 35 includes the sintered metal layer 34 and the recess 3.
And a base portion 35a that collectively covers
a formed on the first rib 38... and the strength of the cavity 50 together with the first ribs 38. Is a member for interpolating. The second ribs 39.
Are arranged on the axis C of the ribs 38 to promote the heat radiation effect of the movable mold 30.

FIG. 4 is an enlarged view of part 4 of FIG.
The narrow groove 51 is formed at a portion in contact with the narrow groove 51.
By disposing the metal particles 53 having a diameter larger than the width of the groove, a heat medium (not shown) is allowed to flow through these narrow grooves 51.
This shows that a structure in which a gap for flowing the heat medium is secured and the heat medium is positively flowed to the bottom 33h. As a result, the cavity 5
Since the heat medium can flow directly into the mold main body 31 at a position close to 0, the heating or cooling time can be reduced. The cross sections of the narrow grooves 51 are arc cross sections as an example. Therefore, the molding pressure applied from the cavity 50 to the sintered metal layer 34 can be dispersed.

FIG. 5 is a sectional view taken along line 5-5 of FIG.
The recess 33 is opened in the mold body 31 so as to approach (see FIG. 3), a sintered metal layer 34 is formed in the recess 33 of the mold body 31, and the recess 33 is closed with a lid member 35. 34
A resin molding die capable of forcibly cooling or forcibly heating the mold body 31 by flowing a cooling medium or a heating medium as a heating medium through the bottom 33 h of the recess 33.
, Through which a heat medium (not shown) flows, and a metal having a diameter larger than the width of the narrow grooves 51. This shows that the structure in which the grains 53 are arranged is adopted.

That is, the movable mold 30 is formed with a narrow groove 51 through which the heat medium flows, at the bottom 33 h of the recess 33.
By arranging the metal particles 53 having a diameter larger than the width of the narrow groove 51 in a portion in contact with the narrow groove 51, a heat medium is allowed to circulate in a portion close to the cavity 50 and a gap for flowing the heat medium is secured. Thus, the heat medium can be positively flown to the bottom 33h of the concave portion 33. As a result, the heating / cooling cycle of the movable mold 30 can be shortened, and the molding cost can be reduced.

In other words, the movable mold 30 has a concave portion 33 formed in the mold body 31 in such a manner as to leave the first ribs 38... The channels 33A to 33F (here, the recesses 33 are referred to as channels 33A to 33F) are formed, and the sintered metal layers 34 are formed in the respective channels 33A to 33F.
Are provided, and the water inlets 36 are provided in the respective flow paths 33A to 33F.
.. And a drain 37. Therefore,
By partitioning the recess 33 into the respective flow paths 33A to 33F, a heat medium (not shown) can be uniformly flowed.
Variations in mold temperature can be reduced.

The operation of the movable mold 30 (resin molding mold) described above will be described below. 6 (a) to 6 (d) are first operation explanatory views of the resin molding die according to the present invention, and show an example of a manufacturing procedure of the movable die 30 (see FIG. 3). (A)
, The metal block 52 is provided with the molded convex portion 32 and the concave portion 3.
3 and the mold body 31 is manufactured. In (b), the recesses 33 are filled with metal particles 53... Of iron-based metal, aluminum-based metal, or stainless steel. In (c), the mold body 31 in which the recesses 33 are filled with the metal particles 53 is placed in a sintering furnace 54, and the metal particles 53 are sintered together to form a sintered metal layer 34. .

In (d), the sintered metal layer 34 and the recess 33 are collectively covered with a cover member 35, and the recess 33 is sealed by bolting or heat welding. After that, the forming protrusion 3
After finishing the two surfaces, the surface of the formed convex portion 32 and the bottom 3 of the concave portion 33 are formed.
When the thickness with respect to the 3h surface is t, the thickness t is set in a range from 2 mm to 5 mm. Here, if the thickness t is 2 mm or less, the strength of the molded projection 32 is insufficient. On the other hand, if it is 5 mm or more, the cooling efficiency or the heat efficiency is deteriorated.

FIGS. 7 (a) and 7 (b) are views for explaining a second operation of the resin molding die according to the present invention, wherein (a) shows a comparative example and (b) shows an example. 1A, a movable mold 100 as a resin molding mold has a mold body 101 formed with a molding protrusion 102, a mold body 101 with a recess 103, and a sintered metal layer formed in the recess 33. 104 and a plurality of water inlets 106.
Are formed, and when a heat medium (not shown) is supplied from the water inlet 106 to the concave portion 103 as shown by an arrow, it is considered that the heat medium cannot be concentrated and flown on the surface of the concave portion 103. Can be

In FIG. 2B, the movable mold 30 has a plurality of narrow grooves 51... Formed in the bottom 33 h of the recess 33, so that a heat medium (not shown) is supplied from the water inlet 36. Since the heat medium can be made to flow in a concentrated manner as indicated by an arrow in the bottom 33h of the concave portion 33, the mold temperature can be quickly controlled.

FIG. 8 is an explanatory view of a third operation of the resin molding die according to the present invention.
h, narrow grooves 51 having a smaller width than the outer diameter of the metal grains 53 constituting the sintered metal layer 34 and having an arc-shaped cross section are formed. Therefore, the sintered metal layer 34 is removed from the cavity 50.
Can be dispersed as indicated by arrows. As a result, the rigidity of the mold body 31 can be substantially improved.

FIG. 9 is an enlarged view of a narrow groove of another embodiment of the resin molding die according to the present invention.
By forming the metal grains 53 having a rectangular cross section and having a diameter larger than the width of the narrow grooves 56... At a portion in contact with the narrow grooves 56. Narrow groove 56
.. Also indicate that a heat medium (not shown) is circulated and the heat medium is positively flowed to the bottom 33h.

FIG. 10 is a partial sectional view of a resin molding die according to a second embodiment of the present invention, and shows a partial cross section of a movable mold 60 as a resin molding die. The movable mold 3
The same parts as in FIG.
31 is a mold main body, 32 is a molding convex part, 33 is a concave part, 33h
Are the bottom of the recess 33, 51 is a narrow groove, 64 is a sintered metal layer formed in the recess, the movable mold 60 has a sintered metal layer 64 having a multilayer structure, ..First layer 64 facing the
The outer diameter of the metal particles 63 constituting A is made to exceed the narrow grooves 51..., And the outer diameter of the metal particles 63B, 63C constituting the other layers 64B, 64C is set to an arbitrary outer diameter. .

For example, by using a metal particle 63B having a larger outer diameter for the second layer 64B, the sintered metal layer 64B can be used.
The amount of the heat medium (not shown) that can flow in the whole can be increased, and the mold temperature can be quickly adjusted. Further, by using a metal particle 63B having a smaller outer diameter for the second layer 64B, a heat medium (not shown) is formed on the bottom 33h of the concave portion 33.
And quickly adjust the mold temperature. Further, since the size of the metal grains 63B and 63C constituting the other layers 64B and 64C can be arbitrarily set, the sintered metal layer 64 can be manufactured at low cost. As a result, the cost of the movable mold 60 can be reduced.

In the second embodiment, as shown in FIG. 9, the sintered metal layer 64 is made up of a first layer 64A and other layers 64A.
Although a three-layer structure of B and 64C is used, the present invention is not limited to this. Further, a material in which the particle size of the metal particles of the other layers is mixed large and small may be used. In this case, by mixing metal particles of any size,
The mold strength can be improved.

[0025]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect of the present invention, a narrow groove is formed at the bottom of the concave portion for flowing the heat medium, and metal particles having a diameter larger than the groove width of the narrow groove are arranged at least at a portion in contact with the narrow groove. The heat medium can be allowed to circulate in a portion near the heat medium, and the heat medium can be positively flown to the bottom of the concave portion by securing a gap through which the heat medium flows. As a result, the heating / cooling cycle of the mold can be shortened, and the molding cost can be reduced.

In the second aspect, since the cross section of the narrow groove is an arc-shaped cross section, the molding pressure applied to the sintered metal layer from the cavity can be dispersed. As a result, the rigidity of the mold body can be substantially improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a resin molding die according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is an enlarged view of a part of FIG. 3;

FIG. 5 is a sectional view taken along line 5-5 of FIG. 1;

FIG. 6 is an explanatory view of a first operation of the resin molding die according to the present invention.

FIG. 7 is an explanatory view of a second operation of the resin molding die according to the present invention.

FIG. 8 is an explanatory view of a third operation of the resin molding die according to the present invention.

FIG. 9 is an enlarged view of a narrow groove of another embodiment of the resin molding die according to the present invention.

FIG. 10 is a partial sectional view of a resin molding die according to a second embodiment of the present invention.

[Explanation of symbols]

30, 60: resin molding die (movable mold), 31: die body, 33: recess, 33h: bottom, 34, 64: sintered metal layer, 50: cavity, 51, 56: narrow groove, 53: metal particles, 64A: first layer, 64B, 64C: other layers.

Continued on the front page (72) Inventor Masateru Tsuji 1-10-1 Shinsayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. F-term (reference) 4F202 AJ08 AJ10 AK13 CA30 CB01 CD27 CN01 CN05 CN12 CN15 CN22

Claims (2)

[Claims] 1. A concave portion is opened in a mold body such that a bottom of the concave portion approaches the cavity, a sintered metal layer is formed in the concave portion of the mold body, and the concave portion is closed with a lid member. A resin molding die capable of forcibly cooling or forcibly heating the mold body by flowing a heat medium as a cooling medium or a heating medium through the heat medium. A resin molding die, wherein a narrow groove to be formed is formed, and a metal particle having a diameter larger than the groove width of the narrow groove is arranged at least in a portion in contact with the narrow groove. 2. The resin molding die according to claim 1, wherein a cross section of the narrow groove is an arc cross section.